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1

A Queuing Theory and Systems Modeling Course Based on Unified Modeling Language (UML)  

Microsoft Academic Search

\\u000a This paper presents the implementation of a new teaching method in the way that a queuing theory and systems modeling or simulation\\u000a course can be done. It also presents how this method was evaluated by the teachers and the students that attended the course\\u000a and answered a questionnaire. This course is based on the use of Unified Modeling Language (UML)

Athanasios Perdos; George Stephanides; Alexander Chatzigeorgiou

2010-01-01

2

Comparison of an AGV transportation system by using the queuing network theory  

Microsoft Academic Search

In this paper, we provide the comparison indicator of the AGV transportation systems. For this purpose, we propose an optimal design methodology for the AGV transportation system by using the queuing network theory. In this methodology, the queuing network theory and a simulation-based optimization method are integrated to obtain the optimal design parameters (i.e., these are the design solutions of

Satoshi HOSHINO; Jun OTA; Akiko SHINOZAKI; Hideki HASHIMOTO

2004-01-01

3

Simulation of Queuing Systems with Different Queuing Disciplines Based on Anylogic  

Microsoft Academic Search

In this paper, based on Anylogic6.0 simulation software, some simulation models of queuing systems with different queuing disciplines are established, including first come first service, last come first service and random service. Compared with the theoretical values, the accuracy of the experiment data is verified. Finally, with comparative analysis of experiment data, we show that under a special condition, the

Ni Zhiwei; Lu Xiaochun; Liu Dongyuan

2009-01-01

4

Evaluation on the Anti-ship Missile Penetration Ability of the Aircraft Carrier Formation Based on Queuing Theory  

Microsoft Academic Search

In order to evaluate the battle ability of missile against aircraft carrier formation, the Markov model is used to simulate the penetration effects for missiles at different altitude and different speed. Based on the particular analysis of the interception system of aircraft carrier formation, assume the raid missiles obey Poisson distribution and the interception system of the formation dispose the

Yong-sheng Li; Wei-li Wang; Yong-jun Qiao; Tao Jiang

2009-01-01

5

Thermal Control for Crossbar-Based Input-Queued Switches  

Microsoft Academic Search

We consider an N×N input-queued switch based on a crossbar switching fabric implemented on a single chip. The thermal power produced by the crossbar chip grows as N R3, where R is the maximum bit rate. Power dissipation is becoming more and more challenging, limiting the crossbar scalability for high performance switches. We propose to exploit Dynamic Voltage and Frequency

Andrea Bianco; Paolo Giaccone; Guido Masera; Marco Ricca

2010-01-01

6

Packet Scheduling in Input-Queued Cell-Based Switches  

Microsoft Academic Search

Input-queued switch architectures play a major role in the de- sign of high performance switches and routers for packet networks. These architectures must be controlled by a scheduling algorithm, which solves contentions in the transfer of data units from inputs to outputs. Several scheduling algorithms were proposed in the literature for input-queued cell switches, operating on fixed-size data units. In

Marco Ajmone Marsan; Andrea Bianco; Paolo Giaccone; Emilio Leonardi; Fabio Neri

2001-01-01

7

A Query Processing Approach Based on Queuing Model for Cyber-Physical Systems  

Microsoft Academic Search

Cyber-Physical Systems (CPS) are integrations of computation with physical processes, and applications of CPS will appear in a wide variety of fields. As part of CPS, sensor networks can observe a physical system by acquiring data and processing queries. In this paper, a query processing approach based on a queuing model is proposed for a mass of periodic queries and

Fangfang Li; Dejun Yue; Chuanwen Li

2010-01-01

8

Application of queuing theory to patient satisfaction at a tertiary hospital in Nigeria  

PubMed Central

Background: Queuing theory is the mathematical approach to the analysis of waiting lines in any setting where arrival rate of subjects is faster than the system can handle. It is applicable to healthcare settings where the systems have excess capacity to accommodate random variations. Materials and Methods: A cross-sectional descriptive survey was done. Questionnaires were administered to patients who attended the general outpatient department. Observations were also made on the queuing model and the service discipline at the clinic. Questions were meant to obtain demographic characteristics and the time spent on the queue by patients before being seen by a doctor, time spent with the doctor, their views about the time spent on the queue and useful suggestions on how to reduce the time spent on the queue. A total of 210 patients were surveyed. Results: Majority of the patients (164, 78.1%) spent 2 h or less on the queue before being seen by a doctor and less than 1 h to see the doctor. Majority of the patients (144, 68.5%) were satisfied with the time they spent on the queue before being seen by a doctor. Useful suggestions proffered by the patients to decrease the time spent on the queue before seeing a doctor at the clinic included: that more doctors be employed (46, 21.9%), that doctors should come to work on time (25, 11.9%), that first-come-first served be observed strictly (32, 15.2%) and others suggested that the records staff should desist from collecting bribes from patients in order to place their cards before others. The queuing method employed at the clinic is the multiple single channel type and the service discipline is priority service. The patients who spent less time on the queue (<1 h) before seeing the doctor were more satisfied than those who spent more time (P < 0.05). Conclusion: The study has revealed that majority of the patients were satisfied with the practice at the general outpatient department. However, there is a need to employ measures to respond to the suggestions given by the patients who are the beneficiaries of the hospital services.

Ameh, Nkeiruka; Sabo, B.; Oyefabi, M. O.

2013-01-01

9

Effects of diversity and procrastination in priority queuing theory: The different power law regimes  

NASA Astrophysics Data System (ADS)

Empirical analyses show that after the update of a browser, or the publication of the vulnerability of a software, or the discovery of a cyber worm, the fraction of computers still using the older browser or software version, or not yet patched, or exhibiting worm activity decays as a power law ˜1/t? with 0queuing theory, of a target task which has the lowest priority compared to all other tasks that flow on the computer of an individual. We identify a “time deficit” control parameter ? and a bifurcation to a regime where there is a nonzero probability for the target task to never be completed. The distribution of waiting time T until the completion of the target task has the power law tail ˜1/t1/2 , resulting from a first-passage solution of an equivalent Wiener process. Taking into account a diversity of time deficit parameters in a population of individuals, the power law tail is changed into 1/t? , with ??(0.5,?) , including the well-known case 1/t . We also study the effect of “procrastination,” defined as the situation in which the target task may be postponed or delayed even after the individual has solved all other pending tasks. This regime provides an explanation for even slower apparent decay and longer persistence.

Saichev, A.; Sornette, D.

2010-01-01

10

Reduced Congestion Queuing: QoS Support for Optimizing Base Station Layout in Multihop Wireless Networks  

NASA Astrophysics Data System (ADS)

A QoS support technique for easily minimizing delay in multihop wireless networks is proposed. Using a priority queue operation that reduces delays overall, the proposed technique, Reduced Congestion Queuing (RCQ), solves problems peculiar to multihops. By adding RCQ to a multihop system, base station or access point density and cost can be more effectively curtailed than by simply applying multihops to a cellular network or wireless LAN because RCQ expands the multihop service area. Due to its simplicity, the proposed technique can be used in a wide range of applications, including VoIP.

Tanaka, Akira; Yoshida, Susumu

11

Effects of diversity and procrastination in priority queuing theory: the different power law regimes.  

PubMed

Empirical analyses show that after the update of a browser, or the publication of the vulnerability of a software, or the discovery of a cyber worm, the fraction of computers still using the older browser or software version, or not yet patched, or exhibiting worm activity decays as a power law approximately 1/t(alpha) with 0queuing theory, of a target task which has the lowest priority compared to all other tasks that flow on the computer of an individual. We identify a "time deficit" control parameter beta and a bifurcation to a regime where there is a nonzero probability for the target task to never be completed. The distribution of waiting time T until the completion of the target task has the power law tail approximately 1/t(1/2), resulting from a first-passage solution of an equivalent Wiener process. Taking into account a diversity of time deficit parameters in a population of individuals, the power law tail is changed into 1/t(alpha), with alpha is an element of (0.5,infinity), including the well-known case 1/t. We also study the effect of "procrastination," defined as the situation in which the target task may be postponed or delayed even after the individual has solved all other pending tasks. This regime provides an explanation for even slower apparent decay and longer persistence. PMID:20365433

Saichev, A; Sornette, D

2010-01-22

12

Optimization of wind turbine vane manufacture based on queuing theory  

Microsoft Academic Search

Wind turbine vane is the key components of wind power generators effectively capture the wind. RTM is a manufacture technology of advanced composite materials, low cost, medium batch blade. Some random factors often lead to the production schedule can not be predetermined program normally. It can help reduce production costs that with the start-up costs were study of production scheduling

Qing-hui Dai; Sha Li

2011-01-01

13

Design and Implementation of High-Speed Input-Queued Switches Based on a Fair Scheduling Algorithm  

NASA Astrophysics Data System (ADS)

To increase both the capacity and the processing speed for input-queued (IQ) switches, we proposed a fair scalable scheduling architecture (FSSA). By employing FSSA comprised of several cascaded sub-schedulers, a large-scale high performance switches or routers can be realized without the capacity limitation of monolithic device. In this paper, we present a fair scheduling algorithm named FSSA_DI based on an improved FSSA where a distributed iteration scheme is employed, the scheduler performance can be improved and the processing time can be reduced as well. Simulation results show that FSSA_DI achieves better performance on average delay and throughput under heavy loads compared to other existing algorithms. Moreover, a practical 64 × 64 FSSA using FSSA_DI algorithm is implemented by four Xilinx Vertex-4 FPGAs. Measurement results show that the data rates of our solution can be up to 800Mbps and the tradeoff between performance and hardware complexity has been solved peacefully.

Hu, Qingsheng; Zhao, Hua-An

14

Queuing Up  

SciTech Connect

The knowledge base of the electric power system engineering community continues to grow with installed capacity of wind generation in North America. While this process has certainly occurred at other times in the industry with other technologies, the relatively explosive growth, the compressed time frames from project conception to commissioning, and the unconventional characteristics of wind generation make this period in the industry somewhat unique. Large wind generation facilities are necessarily evolving to look more and more like conventional generating plants in terms of their ability to interact with the transmission network in a way that does not compromise performance or system reliability. Such an evolution has only been possible through the cumulative contributions of an ever-growing number of power system engineers who have delved into the unique technologies and technical challenges presented by wind generation. The industry is still only part of the way up the learning curve, however. Numerous technical challenges remain, and as has been found, each new wind generation facility has the potential to generate some new questions. With the IEEE PES expanding its presence and activities in this increasingly significant commercial arena, the prospects for staying "ahead of the curve" are brightened.

Miller, Nicholas [GE; Zavadil, Robert [Enenex; Ellis, Abraham [Public Service of New Mexico; Muljadi, Eduard [IEEE Industrial Applications Society; Camm, Ernst [Not Specified; Kirby, Brendan J [ORNL

2007-01-01

15

Using queuing theory to analyse the government's 4-H completion time target in accident and emergency departments.  

PubMed

This paper uses a queuing model to evaluate completion times in Accident and Emergency (A&E) departments in the light of the Government target of completing and discharging 98% of patients inside 4 h. It illustrates how flows though an A&E can be accurately represented as a queuing process, how outputs can be used to visualise and interpret the 4-h Government target in a simple way and how the model can be used to assess the practical achievability of A&E targets in the future. The paper finds that A&E targets have resulted in significant improvements in completion times and thus deal with a major source of complaint by users of the National Health Service in the U.K. It suggests that whilst some of this improvement is attributable to better management, some is also due to the way some patients in A&E are designated and therefore counted through the system. It finds for example that the current target would not have been possible without some form of patient re-designation or re-labelling taking place. Further it finds that the current target is so demanding that the integrity of reported performance is open to question. Related incentives and demand management issues resulting from the target are also briefly discussed. PMID:18390164

Mayhew, L; Smith, D

2008-03-01

16

Fair Scheduling for Input-Queued Switches  

Microsoft Academic Search

Input-queued switch architecture has become attractive for implementing high performance routers because the switching fabric and the buffer need not run at a multiple of input link's rate. It is challenging to provide a scheduling technique that is both highly efficient and fair in resource allocation. We propose an iterative cell-based fair scheduling (iCFS) scheme, based on SLIP that support

C. Roidel; N. Razavi; M. Analoui

2006-01-01

17

Queuing Model for Car Passing.  

National Technical Information Service (NTIS)

A model is developed for the flow of automobiles in one direction along a two-lane, country road. The model takes into account the fact that cars differ in speed, that slower cars accumulate queues behind them, and that the rate of escape from such a queu...

H. J. Yaffe P. M. Morse

1970-01-01

18

Modeling Patient Flows Using a Queuing Network with Blocking  

Microsoft Academic Search

The downsizing and closing of state mental health institutions in Philadelphia in the 1990s led to the development of a continuum care network of residential-based services. Although the diversity of care settings increased, congestion in facilities caused many patients to unnecessarily spend extra days in intensive facilities. This study applies a queuing network system with blocking to analyze such congestion

Naoru Koizumi; Eri Kuno; Tony E. Smith

2005-01-01

19

Scheduling in HPC Resource Management Systems: Queuing vs. Planning  

Microsoft Academic Search

Nearly all existing HPC systems are operated by resource management systems based on the queuing approach. With the increas- ing acceptance of grid middleware like Globus, new requirements for the underlying local resource management systems arise. Features like ad- vanced reservation or quality of service are needed to implement high level functions like co-allocation. However it is dicult to realize

Matthias Hovestadt; Odej Kao; Axel Keller; Achim Streit

2003-01-01

20

Capacity utilization study for aviation security cargo inspection queuing system  

NASA Astrophysics Data System (ADS)

In this paper, we conduct performance evaluation study for an aviation security cargo inspection queuing system for material flow and accountability. The queuing model employed in our study is based on discrete-event simulation and processes various types of cargo simultaneously. Onsite measurements are collected in an airport facility to validate the queuing model. The overall performance of the aviation security cargo inspection system is computed, analyzed, and optimized for the different system dynamics. Various performance measures are considered such as system capacity, residual capacity, throughput, capacity utilization, subscribed capacity utilization, resources capacity utilization, subscribed resources capacity utilization, and number of cargo pieces (or pallets) in the different queues. These metrics are performance indicators of the system's ability to service current needs and response capacity to additional requests. We studied and analyzed different scenarios by changing various model parameters such as number of pieces per pallet, number of TSA inspectors and ATS personnel, number of forklifts, number of explosives trace detection (ETD) and explosives detection system (EDS) inspection machines, inspection modality distribution, alarm rate, and cargo closeout time. The increased physical understanding resulting from execution of the queuing model utilizing these vetted performance measures should reduce the overall cost and shipping delays associated with new inspection requirements.

Allgood, Glenn O.; Olama, Mohammed M.; Lake, Joe E.; Brumback, Daryl

2010-04-01

21

Performance Evaluation of Handoff Queuing Schemes  

Microsoft Academic Search

One of the main advantages of new wireless systems is the freedom to make and receive calls anywhere and at any time; handovers are considered a key element for providing this mobility. This paper presents the handoff queuing problem in cellular networks. We propose a model to study three handoff queuing schemes, and provide a performance evaluation of these ones.

Mohamed A. Ahmed; N. M. Ibrahim; H. H. El-Tamally

2010-01-01

22

Application of queuing model in Dubai's busiest megaplex  

NASA Astrophysics Data System (ADS)

This paper provides a study and analysis of the extremely busy booking counters at the Megaplex in Dubai using the queuing model and simulation. Dubai is an emirate in UAE with a multicultural population. Majority of the population in Dubai is foreign born. Cinema is one of the major forms of entertainment. There are more than 13 megaplexes each with a number of screens ranging from 3 to 22. They screen movies in English, Arabic, Hindi and other languages. It has been observed that during the weekends megaplexes attract a large number of crowd resulting in long queues at the booking counters. One of the busiest megaplex was selected for the study. Queuing theory satisfies the model when tested in real time situation. The concepts of arrival rate, service rate, utilization rate, waiting time in the system, average number of people in the queue, using Little's Theorem and M/M/s queuing model along with simulation software have been used to suggest an empirical solution. The aim of the paper is twofold-To assess the present situation at the Megaplex and give recommendations to optimize the use of booking counters.

Bhagchandani, Maneesha; Bajpai, Priti

2013-09-01

23

Queuing network modeling of the psychological refractory period (PRP).  

PubMed

The psychological refractory period (PRP) is a basic but important form of dual-task information processing. Existing serial or parallel processing models of PRP have successfully accounted for a variety of PRP phenomena; however, each also encounters at least 1 experimental counterexample to its predictions or modeling mechanisms. This article describes a queuing network-based mathematical model of PRP that is able to model various experimental findings in PRP with closed-form equations including all of the major counterexamples encountered by the existing models with fewer or equal numbers of free parameters. This modeling work also offers an alternative theoretical account for PRP and demonstrates the importance of the theoretical concepts of "queuing" and "hybrid cognitive networks" in understanding cognitive architecture and multitask performance. PMID:18954209

Wu, Changxu; Liu, Yili

2008-10-01

24

End-to-end queuing delay assessment in multi-service ip networks  

Microsoft Academic Search

Packet-based networks are more and more used to transport interactive streaming services like telephony and videophony. To guarantee a good quality for these services, the queuing delay and delay jitter introduced in the transport of voice or video flows over the packet-based network should be kept under control. Because data sources tend to increase their sending rate until (a part

D. De Vleeschauwer; M. J. C. Büchli; A. Van Moffaert; R. E. Kooij

2002-01-01

25

Theory-Based Stakeholder Evaluation  

ERIC Educational Resources Information Center

|This article introduces a new approach to program theory evaluation called theory-based stakeholder evaluation or the TSE model for short. Most theory-based approaches are program theory driven and some are stakeholder oriented as well. Practically, all of the latter fuse the program perceptions of the various stakeholder groups into one unitary…

Hansen, Morten Balle; Vedung, Evert

2010-01-01

26

Exact results for the Barabási queuing model.  

PubMed

Previous works on the queuing model introduced by Barabási to account for the heavy tailed distributions of the temporal patterns found in many human activities mainly concentrate on the extremal dynamics case and on lists of only two items. Here we obtain exact results for the general case with arbitrary values of the list length L and of the degree of randomness that interpolates between the deterministic and purely random limits. The statistically fundamental quantities are extracted from the solution of master equations. From this analysis, scaling features of the model are uncovered. PMID:19905297

Anteneodo, C

2009-10-27

27

Exact results for the Barabási queuing model  

NASA Astrophysics Data System (ADS)

Previous works on the queuing model introduced by Barabási to account for the heavy tailed distributions of the temporal patterns found in many human activities mainly concentrate on the extremal dynamics case and on lists of only two items. Here we obtain exact results for the general case with arbitrary values of the list length L and of the degree of randomness that interpolates between the deterministic and purely random limits. The statistically fundamental quantities are extracted from the solution of master equations. From this analysis, scaling features of the model are uncovered.

Anteneodo, C.

2009-10-01

28

Agent-Based Literacy Theory  

ERIC Educational Resources Information Center

|The purpose of this theoretical essay is to explore the limits of traditional conceptualizations of reader and text and to propose a more general theory based on the concept of a literacy agent. The proposed theoretical perspective subsumes concepts from traditional theory and aims to account for literacy online. The agent-based literacy theory

McEneaney, John E.

2006-01-01

29

Scheduling cells in an input-queued switch  

Microsoft Academic Search

We present two algorithms, IRRM and SLIP-IRRM, for scheduling cells in an input-queued cell switch.Both algorithms exhibit asymptotically 100% utilisation under high load; SLIP-IRRM within a single iteration.1 IntroductionThe major problem with input-queued switches is head-of-line blocking which can limit the maximum throughputasymptotically to 58% [1].Previous algorithms have improved upon the 58% utilisation [2, 3, 4, 5, 6] using non-FIFO

Nick Mckeown; Pravin Varaiya; Jean Walrand

1993-01-01

30

Cache-Based Memory Copy Hardware Accelerator for Multicore Systems  

Microsoft Academic Search

In this paper, we present a new architecture of the cache-based memory copy hardware accelerator in a multicore system supporting message passing. The accelerator is able to accelerate memory data movements, in particular memory copies. We perform an analytical analysis based on open-queuing theory to study the utilization of our accelerator in a multicore system. In order to correctly model

Filipa Duarte; Stephan Wong

2010-01-01

31

A New Approach for Analyzing Queuing Models of Material Control Strategies in Manufacturing Systems  

Microsoft Academic Search

This paper discusses a new approach for analyzing queuing models of material control strategies such as kanban, CONWIP and POLCA in manufacturing systems. In practice, these strategies regulate the flow of jobs at various stations of the manufacturing system using a combination of card loops and authorization signals. Queuing models of such systems are composed of closed queuing networks corresponding

Ananth Krishnamurthy; Rajan Suri; Mary Vernon

32

A refined beam theory based on the refined plate theory  

Microsoft Academic Search

Summary Based on the refined plate theory, a refined theory of rectangular beams is derived by using the Papkovich-Neuber solution and Lur’e method without ad hoc assumptions. It is shown that the displacements and stresses of the beam can be represented by the angle of rotation and the deflection of the neutral surface. The solutions based on the new theory

Y. Gao; M. Z. Wang

2005-01-01

33

Optimal Pricing Strategy for Queuing Systems with Capacity Constraint Problem  

Microsoft Academic Search

Although the lost profit from lost business is quite difficult to estimate for the queuing systems with cyclic demands, my previous work presents a creative and effective approach to formulate waiting cost as balking loss. Using the estimation of waiting cost allows decision maker to have the capability of determining the optimal number of servers for each planning period by

Pen-Yuan Liao

2007-01-01

34

Practical algorithms for multicast support in input queued switches  

Microsoft Academic Search

This paper deals with multicast flow support in NtimesN input queued switch architectures. A practical approach to support multicast traffic is presented, assuming that O(N) queues are available at each input port. The focus is on dynamic queueing policies, where, at each input port, multicast flows are assigned to one among the available queues when flows become active: flows are

Andrea Bianco; Paolo Giaccone; Chiara Piglione; Sonia Sessa

2006-01-01

35

Research on collaboration of before production logistics based on manufacturing industry  

Microsoft Academic Search

This paper studies the collaboration of material supply and production, using queuing theory, constructs forklifts allocation model in cargo receiving area of manufacturing enterprises based on production plans, schedules dynamic logistics timetables of suppliers, and uses eM-Plant software to simulate the model. This study solves the receiving area bottlenecks caused by the implementation of synchronous supply, achieves the collaboration of

Zhanzhong Wang; Zhiyong Chen; Hongguo Xu; Jiabin Zheng; Zhuoqi Zhang

2008-01-01

36

A Novel Packet Queuing and Scheduling Algorithm and Its Link Sharing Performance for the Home Internet Gateway  

Microsoft Academic Search

A home Internet gateway is the node that resides between a public network and a home network for computers to share Internet connections. To insert customized queuing and scheduling codes into the embedded Linux kernel is a way to make the Linux-based home Internet gateways support Quality of Service(QoS). It is desirable that the small Linux kernel adopts an efficient

Yan Jin; Biao Chen

2009-01-01

37

Queuing of concurrent movement plans by basal ganglia.  

PubMed

How the brain converts parallel representations of movement goals into sequential movements is not known. We tested the role of basal ganglia (BG) in the temporal control of movement sequences by a convergent approach involving inactivation of the BG by muscimol injections into the caudate nucleus of monkeys and assessing behavior of Parkinson's disease patients, performing a modified double-step saccade task. We tested a critical prediction of a class of competitive queuing models that explains serial behavior as the outcome of a selection of concurrently activated goals. In congruence with these models, we found that inactivation or impairment of the BG unmasked the parallel nature of goal representations such that a significantly greater extent of averaged saccades, curved saccades, and saccade sequence errors were observed. These results suggest that the BG perform a form of competitive queuing, holding the second movement plan in abeyance while the first movement is being executed, allowing the proper temporal control of movement sequences. PMID:23761894

Bhutani, Neha; Sureshbabu, Ramakrishnan; Farooqui, Ausaf A; Behari, Madhuri; Goyal, Vinay; Murthy, Aditya

2013-06-12

38

Time-varying priority queuing models for human dynamics  

NASA Astrophysics Data System (ADS)

Queuing models provide insight into the temporal inhomogeneity of human dynamics, characterized by the broad distribution of waiting times of individuals performing tasks. We theoretically study the queuing model of an agent trying to execute a task of interest, the priority of which may vary with time due to the agent's “state of mind.” However, its execution is disrupted by other tasks of random priorities. By considering the priority of the task of interest either decreasing or increasing algebraically in time, we analytically obtain and numerically confirm the bimodal and unimodal waiting time distributions with power-law decaying tails, respectively. These results are also compared to the updating time distribution of papers in arXiv.org and the processing time distribution of papers in Physical Review journals. Our analysis helps to understand human task execution in a more realistic scenario.

Jo, Hang-Hyun; Pan, Raj Kumar; Kaski, Kimmo

2012-06-01

39

Modified weighted fair queuing for packet scheduling in mobile WiMAX networks  

NASA Astrophysics Data System (ADS)

The increase of user mobility and the need for data access anytime also increases the interest in broadband wireless access (BWA). The best available quality of experience for mobile data service users are assured for IEEE 802.16e based users. The main problem of assuring a high QOS value is how to allocate available resources among users in order to meet the QOS requirement for criteria such as delay, throughput, packet loss and fairness. There is no specific standard scheduling mechanism stated by IEEE standards, which leaves it for implementer differentiation. There are five QOS service classes defined by IEEE 802.16: Unsolicited Grant Scheme (UGS), Extended Real Time Polling Service (ertPS), Real Time Polling Service (rtPS), Non Real Time Polling Service (nrtPS) and Best Effort Service (BE). Each class has different QOS parameter requirements for throughput and delay/jitter constraints. This paper proposes Modified Weighted Fair Queuing (MWFQ) scheduling scenario which was based on Weighted Round Robin (WRR) and Weighted Fair Queuing (WFQ). The performance of MWFQ was assessed by using above five QoS criteria. The simulation shows that using the concept of total packet size calculation improves the network's performance.

Satrya, Gandeva B.; Brotoharsono, Tri

2013-03-01

40

Achieving 100% throughput in an input-queued switch  

Microsoft Academic Search

It is well known that head-of-line blocking limits the throughput of an input-queued switch with first-in-first-out (FIFO) queues. Under certain conditions, the throughput can be shown to be limited to approximately 58.6%. It is also known that if non-FIFO queueing policies are used, the throughput can be increased. However, it has not been previously shown that if a suitable queueing

Nick McKeown; Adisak Mekkittikul; Venkat Anantharam; Jean Walrand

1999-01-01

41

Achieving 100% Throughput in an Input-Queued Switch  

Microsoft Academic Search

It is well known that head-of-line (HOL) blocking limits the throughput of an input-queued switch with FIFO queues. Under certain conditions, the throughput can be shown to be limited to approximately 58%. It is also known that if non-FIFO queueing policies are used, the throughput can be increased. However, it has not been previously shown that if a suitable queueing

Nick Mckeown; Venkat Anantharam; Jean C. Walrand

1996-01-01

42

Goal Theory Based on Defeasible Logic  

Microsoft Academic Search

Traditional goal theory adopts Kripkean possible world semantics based normal modal logic to describe goal operator, which has monotonic trait. This paper argues that goal has non-monotonic nature; therefore, defeasible logic is imported to build goal theory. Case study shows that the novel goal theory can solve logic omniscience ideally.

Yanbin Peng; Lv Ye; Zhijun Zheng; Jian Xiang; Ji Gao; Jieqing Ai; Zhenyu Lu; Yu Jin; Xueqin Jiang

2009-01-01

43

Closeness theory based fuzzy ART model  

Microsoft Academic Search

A fuzzy ART neural network model based on the closeness theory, called CBFART, is introduced in this paper. It incorporates two concepts of the fuzzy set theory, the closeness and closet principle with the adaptive resonance theory (ART), to form a new neural network model. The model is characterized with a matching-consigning cycle, and classification of patterns in the network

Zhang Dianzhi; Liu Wenhua; Lei Hongli

2000-01-01

44

ANALYSIS OF THE SALES CHECKOUT OPERATION IN ICA SUPERMARKET USING QUEUING SIMULATION  

Microsoft Academic Search

This paper contains the analysis of Queuing systems for the empirical data of supermarket checkout service unit as an example. One of the expected gains from studying queuing systems is to review the efficiency of the models in terms of utilization and waiting length, hence increasing the number of queues so customers will not have to wait longer when servers

Azmat Nafees

45

A Performance Evaluation of Multiple Input Queued (MIQ) Switch with Iterative Weighted Slip Algorithm  

Microsoft Academic Search

Many researchers had evaluated the throughput and delay performance of virtual output queued (VOQ) packet switches using iterative weighted\\/un-weighted scheduling algorithms. Prof. Nick Mckeown from Stanford University had evolved with excellent iterative maximal matching (i-slip) scheme which provides throughput near to 100%. Prof. Kim had suggested multiple input queued architecture which also provide more than 90 % throughput for less

S N Kore; Sayali Kore; Ajinkya Biradar; P J Kulkarni

2012-01-01

46

Theory-Based Evaluation: Reflections Ten Years On. Theory-Based Evaluation: Past, Present, and Future  

ERIC Educational Resources Information Center

This chapter begins with a brief introduction by Rogers, in which she highlights the continued salience of Carol Weiss's decade-old questions about theory-based evaluation. Theory-based evaluation has developed significantly since Carol Weiss's chapter was first published ten years ago. In 1997 Weiss pointed to theory-based evaluation being mostly…

Rogers, Patricia J.; Weiss, Carol H.

2007-01-01

47

Theory-Based Evaluation: Reflections Ten Years On. Theory-Based Evaluation: Past, Present, and Future  

ERIC Educational Resources Information Center

|This chapter begins with a brief introduction by Rogers, in which she highlights the continued salience of Carol Weiss's decade-old questions about theory-based evaluation. Theory-based evaluation has developed significantly since Carol Weiss's chapter was first published ten years ago. In 1997 Weiss pointed to theory-based evaluation being…

Rogers, Patricia J.; Weiss, Carol H.

2007-01-01

48

Markovian Ants in a Queuing System  

NASA Astrophysics Data System (ADS)

The synthesis of memoryless Markovian systems and Ant based concept with memory characteristics of deposit pheromone is the basis for the presented artificial intelligence hybrid. Only the initial elements of the system are specified in this paper by illustrating the routes of two ants. The pheromone capacity was first modelled as an exponential-type random variable. The Ant Queueing System was formed. The pheromone capacity was then used to form two independent exponential random variables. The convolution of these variables induces significant quality and quantity changes, mainly the decrease in entropy. The study also provides a possible method for dealing with stationary queueing systems when we are familiar with the state probability and the arrival rate and service rate are unknown.

Tanackov, Ilija; Simi?, Dragan; Sremac, Siniša; Tepi?, Jovan; Koci?-Tanackov, Sun?ica

49

Outcome-based theory of work motivation  

Microsoft Academic Search

This paper introduces an outcome-based theory of work motivation. This theory focuses on the individual's expected consequences of his or her action. We identify four different types of expected consequences, or motives. These motives lead to four types of motivation: extrinsic, intrinsic, contributive, and relational. We categorize these outcomes using two criteria: the perceived locus of causality, which defines the

Pablo Cardona; Barbara S. Lawrence; Alvaro Espejo

2003-01-01

50

Non-Equilibrium Statistical Physics of Currents in Network Queuing  

NASA Astrophysics Data System (ADS)

We present a framework for studying large deviations of currents in a queuing network viewed as a non-equilibrium system of interacting particles. The network is completely specified by its underlying graphical structure, the number of servers (type of interaction) at each node, and the Poisson transition rates between nodes/stations. We focus on analyzing the statistics of currents over the network for the class of stable (statistically steady) networks. Some of our results are general (and surprising) explicit statements and some are conjectures, validated on a network with feedback which allows an independent spectral analysis. In particular, we show that for sufficiently strong atypical currents the system experiences a dynamical transition into a ``congested" regime, characterized by the saturation of certain servers in the network. We also discuss possible applications of these results for the analysis and control of traffic flows in transportation networks and of scheduling power flows in electric grids.

Chertkov, Michael; Chernyak, Vladimir; Goldberg, David; Turitsyn, Konstantin

2010-03-01

51

A decomposed hierarchical logarithmic scheduling algorithm for input-queued switches  

Microsoft Academic Search

Throughput of input queued switches is limited to 58.6% due to head of line blocking (HoL). Using virtual output queuing (VOQ) at inputs and a proper scheduling algorithm, near 100% throughput can be achieved. Scaling in terms of number of ports and line rate is an important factor for high-speed switches. Current available switches support line rates about 10 Gbps,

A. M. Z. Bidoki; S. V. Azhari; N. Yazdani

2003-01-01

52

Field theory based covariant models  

SciTech Connect

Various relativistic schemes based on effective field theoretical models are reviewed for various physical systems. As a particular example of a composite system the deuteron is considered, where a theoretical description is discussed in which the electromagnetic interaction and dynamics can be treated in a consistent way. The role of relativity is studied for the various electromagnetic deuteron structure functions. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.

Tjon, J.A. [Institute for Theoretical Physics, University of Utrecht, P.O. Box 80.000, 3508 TA Utrecht (Netherlands)

1995-05-10

53

Jigsaw Cooperative Learning: Acid-Base Theories  

ERIC Educational Resources Information Center

|This study focused on investigating the effectiveness of jigsaw cooperative learning instruction on first-year undergraduates' understanding of acid-base theories. Undergraduates' opinions about jigsaw cooperative learning instruction were also investigated. The participants of this study were 38 first-year undergraduates in chemistry education…

Tarhan, Leman; Sesen, Burcin Acar

2012-01-01

54

Influence diagram based on rough set theory  

Microsoft Academic Search

In conventional influence diagrams, the numerical models of uncertainty and imprecise knowledge from large-scaled data set is involved in the systems, the suitability of probability distributions is questioned. The influence diagrams model based on rough sets are proposed in this paper. In the framework, the causal relationships among the nodes and the decision rules are expressed with rough set theory.

Yueling Zhao; Hui Jin; Lihong Wang; Shuang Wang

2010-01-01

55

An Information-Based Theory of Conditionals  

Microsoft Academic Search

We present an approach to combining three areas of research which we claim are all based on information theory: knowledge representation in Ar- tificial Intelligence and Cognitive Science using prototypes, plans, or schemata; formal semantics in natural language, especially the semantics of the 'if-then' conditional construct; and the logic of subjunctive conditionals first developed using a possible worlds semantics by

Wayne Wobcke

2000-01-01

56

Jigsaw Cooperative Learning: Acid-Base Theories  

ERIC Educational Resources Information Center

This study focused on investigating the effectiveness of jigsaw cooperative learning instruction on first-year undergraduates' understanding of acid-base theories. Undergraduates' opinions about jigsaw cooperative learning instruction were also investigated. The participants of this study were 38 first-year undergraduates in chemistry education…

Tarhan, Leman; Sesen, Burcin Acar

2012-01-01

57

Knowledge Recommendation Based on Social Network Theory  

Microsoft Academic Search

In knowledge management systems (KMS), the overabundance of information has forced users to spend more time searching for information that they need. If KMS can discover users' interests and initiatively recommend knowledge which users are interested in, it will greatly improve users' satisfaction. In this paper, based on social network theory, we propose a new method for establishing a knowledge

Bei Fan; Lu Liu; Ming Li; Yin Wu

2008-01-01

58

A complexity theory based on Boolean algebra  

Microsoft Academic Search

A projection of a Boolean function is a function obtained by substituting for each of its variables a variable, the negation of a variable, or a constant. Reducibilities among computational problems under this relation of projection are considered. It is shown that much of what is of everyday relevance in Turing-machine-based complexity theory can be replicated easily and naturally in

Sven Skyum; Leslie G. Valiant

1985-01-01

59

Modelling pedestrian travel time and the design of facilities: a queuing approach.  

PubMed

Pedestrian movements are the consequence of several complex and stochastic facts. The modelling of pedestrian movements and the ability to predict the travel time are useful for evaluating the performance of a pedestrian facility. However, only a few studies can be found that incorporate the design of the facility, local pedestrian body dimensions, the delay experienced by the pedestrians, and level of service to the pedestrian movements. In this paper, a queuing based analytical model is developed as a function of relevant determinants and functional factors to predict the travel time on pedestrian facilities. The model can be used to assess the overall serving rate or performance of a facility layout and correlate it to the level of service that is possible to provide the pedestrians. It has also the ability to provide a clear suggestion on the designing and sizing of pedestrian facilities. The model is empirically validated and is found to be a robust tool to understand how well a particular walking facility makes possible comfort and convenient pedestrian movements. The sensitivity analysis is also performed to see the impact of some crucial parameters of the developed model on the performance of pedestrian facilities. PMID:23691055

Rahman, Khalidur; Ghani, Noraida Abdul; Kamil, Anton Abdulbasah; Mustafa, Adli; Kabir Chowdhury, Md Ahmed

2013-05-15

60

Flocculation control study based on fractal theory*  

PubMed Central

A study on flocculation control based on fractal theory was carried out. Optimization test of chemical coagulant dosage confirmed that the fractal dimension could reflect the flocculation degree and settling characteristics of aggregates and the good correlation with the turbidity of settled effluent. So that the fractal dimension can be used as the major parameter for flocculation system control and achieve self-acting adjustment of chemical coagulant dosage. The fractal dimension flocculation control system was used for further study carried out on the effects of various flocculation parameters, among which are the dependency relationship among aggregates fractal dimension, chemical coagulant dosage, and turbidity of settled effluent under the conditions of variable water quality and quantity. And basic experimental data were obtained for establishing the chemical coagulant dosage control model mainly based on aggregates fractal dimension.

Chang, Ying; Liu, Qian-jun; Zhang, Jin-song

2005-01-01

61

Queuing Performance of Long-Range Dependent Traffic Regulated by Token-Bucket Policers  

Microsoft Academic Search

Long-range dependence (LRD) is a widely verified property of Internet traffic, which severely affects network per- formance yielding longer queuing delays. Token-bucket policers are commonly proposed to enforce the statistical profile of input traffic, but they can hardly reduce LRD and thus can be ineffec- tive to protect service level agreements against LRD increase in input traffic. In this paper,

Stefano Bregni; Roberto Cioffi; Paolo Giacomazzi

2008-01-01

62

A logarithmic scheduling algorithm for high speed input-queued switches  

Microsoft Academic Search

Throughput of input queued switches using FIFOs is limited due to the Head of Line blocking (HoL) problem. Using VOQs at inputs and a proper scheduling algorithm, near 100% throughput can be achieved. Scaling in terms of number of ports and line rates is a crucial factor for switches deployed in very high speed networks. We propose a novel scheduler

Ali Mohammad Zareh Bidoki; Nasser Yazdani; Sayed Vahid Azhari

2008-01-01

63

Queued Service Observing (QSO) at CFHT I. Phase 2 Database and Observation Submission Tool  

Microsoft Academic Search

We have designed a web application, the Phase 2 Tool (PH2), which enables scientific investigators to precisely describe the observations to be carried out in the Queued Service Observing (QSO) mode with the CFH12K mosaic wide-field imager at CFHT . This application stores the observation definitions in a relational database which is later used to select and perform observations in

R. Savalle; P. Martin; J. Shapiro; T. Vermeulen

2002-01-01

64

Developing nonlinear queuing regressions to increase emergency department patient safety: Approximating reneging with balking  

Microsoft Academic Search

Administrators know when Emergency Department (ED) overcrowding is a problem in their hospital. Lead times to change ED capacity are long and require strategic tools. ED patients who Leave WithOut Treatment (LWOT) before seeing a physician are, in queuing nomenclature, ‘reneging’ from an overcrowded situation and are an important measure of ED patient safety. We propose to enable strategic decision

Jeffery K. Cochran; James R. Broyles

2010-01-01

65

Final Report for the 'Queuing Network Models of Performance of High End Computing Systems.'  

National Technical Information Service (NTIS)

The primary objective of this project is to perform general research into queuing network models of performance of high end computing systems. A related objective is to investigate and predict how an increase in the number of nodes of a supercomputer will...

J. Buckwalter

2005-01-01

66

Simulating the customer purchasing\\/personal selling process in retailing with a queuing approach  

Microsoft Academic Search

This paper presents a simulation model developed for a nonstandard retail queuing system. The type of system for which the model and simulation results are appropriate is one utilizing both open display and personal selling to sell shopping goods. Two characteristics of this kind of system differentiate it from operations generally considered amenable to waiting line analysis. First, an arrival

R. Dale VonRiesen; Lester W. Jacobs

1978-01-01

67

A Quantitative Comparison of Iterative Scheduling Algorithms for Input-Queued Switches  

Microsoft Academic Search

Abstract In this paper we quantitatively evaluate three iterative algorithms for scheduling cells in a high - bandwidth input - queued ATM switch In particular, we compare the performance of an algorithm described previously | parallel iterative matching (PIM) | with two new algorithms: iterative round - robin matching with slip (iSLIP) and iterative least - recently used (iLRU) We

Nick Mckeown; Thomas E. Anderson

1998-01-01

68

The Study of Project Cost Estimation Based on Cost-Significant Theory and Neural Network Theory  

Microsoft Academic Search

Based on the reference to domestic and foreign correlative theories and methods, cost-significant theory and neural network\\u000a theory are used to estimate project cost in the paper. The cost-significant theory is put forward to solve the tedious operation\\u000a issues by finding out significant items to simplify the operational difficulty of engineering cost estimation. Then the BP\\u000a neural network is applied

Xinzheng Wang; Liying Xing; Feng Lin

69

Optimization in Brain? - Modeling Human Behavior and Brain Activation Patterns with Queuing Network and Reinforcement Learning Algorithms  

Microsoft Academic Search

\\u000a Here we present a novel approach to model brain and behavioral phenomena of multitask performance, which integrates queuing\\u000a networks with reinforcement learning algorithms. Using the queuing network as the static platform of brain structure and reinforcement\\u000a learning as the dynamic algorithm to quantify the learning process, this model successfully accounts for several behavioral\\u000a phenomena related to the learning process of

Changxu Wu; Marc Berman; Yili Liu

70

A Theory of Effective Computer-Based Instruction for Adults  

ERIC Educational Resources Information Center

|This study presents a theory of critical components that affect the effectiveness of computer-based instruction (CBI) for adults. The theory was developed to provide a framework for research to explain or predict effective learning by adults using a desktop computer. The five conclusions drawn from this theory are as follows: (a) the…

Lowe, Janis S.; Holton, Elwood F., III

2005-01-01

71

A Library Booking Policy Based on Stocking Theory  

Microsoft Academic Search

This paper puts forward a new booking policy based on data mining technology and stocking theory. The main idea is to analysis Web logs of the library system by data mining theory to get what kinds of books are studentspsila interests most and then analysis these books by stocking theory to get the best booking policy. At the last part

Wensheng Wang; Yantai China

2009-01-01

72

Grid Map Building Based on DS Evidence Theory  

Microsoft Academic Search

A method of constructing a grid map using ultrasonic sensors based on Dempster-Shafer evidence theory (D-S evidence theory) is proposed with respect to the problem of unstructured unknown environment mapping. Mobile robot explores environment with ultrasonic sensors. D-S evidence theory is used to fuse multi-sensor information. The problem that D-S evidence theory can't be applied to information fusion under certain

Hongyu Cao; Zhi Tan; Hanxu Sun; Tao Yu

2009-01-01

73

Traffic performance analysis for cellular communication systems with mixed platform types and queued hand-offs  

Microsoft Academic Search

Cellular communication systems that support a mixture of platform types and queuing of hand-off calls are considered. In pure loss systems, if there are no channels available at the target gateway, the hand-off attempt fails and the call is forced to terminate. In delay systems, however, hand-off calls can be held in queue while the supporting mobile is within a

Cezary Purzynski; Stephen S. Rappaport

1993-01-01

74

A hybrid closed queuing network model for multi-threaded dataflow architecture  

Microsoft Academic Search

In this paper, a closed queuing network model with both single and multiple servers has been proposed to model dataflow in a multi-threaded architecture. Multi-threading is useful in reducing the latency by switching among a set of threads in order to improve the processor utilization. Two sets of processors, synchronization and execution processors exist. Synchronization processors handle load\\/store operations and

Vidhyacharan Bhaskar

2005-01-01

75

A Quantitative Comparison of Scheduling Algorithms for Input-Queued Switches  

Microsoft Academic Search

This paper quantitatively evaluates several alternative approaches to the scheduling of cells in a highbandwidthinput-queued ATM switch. In particular, we compare the performance of three algorithms describedpreviously: FIFO queueing, parallel iterative matching (PIM), maximum matching and two new algorithms:iterative round-robin matching with slip (SLIP) and least-recently used (LRU). For the synthetic workloadswe consider, including uniform and bursty traffic, SLIP performs

Nick Mckeown; Thomas E. Anderson

1997-01-01

76

D-LQF: An Efficient Distributed Scheduling Algorithm for Input-Queued Switches  

Microsoft Academic Search

Iterative scheduling algorithms are attractive in finding a maximal size matching for an input-queued switch. For constructing a large high-speed switch, a distributed multi-chip implementation of an iterative scheduling algorithm should be followed. Since different chips may locate on different switch linecards and linecards can be separated by tens of meters, the propagation delay between chips\\/linecards is non-negligible. This calls

Chunzhi He; Kwan L. Yeung

2011-01-01

77

Theory-Based University Admissions Testing for a New Millennium  

ERIC Educational Resources Information Center

|This article describes two projects based on Robert J. Sternberg's theory of successful intelligence and designed to provide theory-based testing for university admissions. The first, Rainbow Project, provided a supplementary test of analytical, practical, and creative skills to augment the SAT in predicting college performance. The Rainbow…

Sternberg, Robert J.

2004-01-01

78

A new supervised local modelling classifier based on information theory  

Microsoft Academic Search

In this paper, a novel supervised architecture for binary classification based on local modelling and information theory is described. The architecture is composed of two steps: in the first one, a separating borderline between the two classes is piecewise constructed by a set of centroids calculated by a modified clustering algorithm, based on information theory; each of these centroids define

David Martínez-Rego; Oscar Fontenla-Romero; Iago Porto-Díaz; Amparo Alonso-Betanzos

2009-01-01

79

Mechanism-based strain gradient plasticity— I. Theory  

Microsoft Academic Search

A mechanism-based theory of strain gradient plasticity (MSG) is proposed based on a multiscale framework linking the microscale notion of statistically stored and geometrically necessary dislocations to the mesoscale notion of plastic strain and strain gradient. This theory is motivated by our recent analysis of indentation experiments which strongly suggest a linear dependence of the square of plastic flow stress

H. Gao; Y. Huang; W. D. Nix; J. W. Hutchinson

1999-01-01

80

A Communication-Based Theory of Instruction.  

ERIC Educational Resources Information Center

|A comprehensive theory of instruction is needed that (1) acknowledges the centrality of communication to instruction; (2) recognizes that instruction involves changes in student knowledge, affect, and behavior; and (3) reflects a systematic orientation to instruction. The literature in diffusion, particularly in the area of the communication of…

Elliot, Scott M.; Scott, Michael D.

81

A Theory-Based Computer Tutorial Model.  

ERIC Educational Resources Information Center

|Because of the need for models to illustrate some possible answers to practical courseware development questions, a specific, three-section model incorporating the Corrective Feedback Paradigm (PCP) is advanced for applying theory to courseware. The model is reconstructed feature-by-feature against a framework of a hypothetical, one-to-one,…

Dixon, Robert C.; Clapp, Elizabeth J.

82

A Theory-Based Computer Tutorial Model.  

ERIC Educational Resources Information Center

Because of the need for models to illustrate some possible answers to practical courseware development questions, a specific, three-section model incorporating the Corrective Feedback Paradigm (PCP) is advanced for applying theory to courseware. The model is reconstructed feature-by-feature against a framework of a hypothetical, one-to-one,…

Dixon, Robert C.; Clapp, Elizabeth J.

83

The Prediction of Item Parameters Based on Classical Test Theory and Latent Trait Theory  

ERIC Educational Resources Information Center

|In this study, the prediction power of the item characteristics based on the experts' predictions on conditions try-out practices cannot be applied was examined for item characteristics computed depending on classical test theory and two-parameters logistic model of latent trait theory. The study was carried out on 9914 randomly selected students…

Anil, Duygu

2008-01-01

84

Toric bases for 6D F-theory models  

NASA Astrophysics Data System (ADS)

We find all smooth toric bases that support elliptically fibered Calabi-Yau threefolds, using the intersection structure of the irreducible effective divisors on the base. These bases can be used for F-theory constructions of six-dimensional quantum supergravity theories. There are 61,539 distinct possible toric bases. The associated 6D supergravity theories have a number of tensor multiplets ranging from 0 to 193. For each base an explicit Weierstrass parameterization can be determined in terms of the toric data. The toric counting of parameters matches with the gravitational anomaly constraint on massless fields. For bases associated with theories having a large number of tensor multiplets, there is a large non-Higgsable gauge group containing multiple irreducible gauge group factors, particularly those having algebras e_8, f_4 and (g_2 + su(2)) with minimal (non-Higgsable) matter.

Morrison, D. R.; Taylor, W.

2012-11-01

85

Heuristic classification of physical theories based on quantum correlations  

NASA Astrophysics Data System (ADS)

Taking quantum formalism as a point of reference and connection, we explore the various possibilities that arise in the construction of physical theories. Analyzing the distinct physical phenomena that each of them may describe, we introduce the different types of theories that correspond to these physical phenomena. A hierarchical classification of the offered theories, based on the degree of correlation between dichotomic observables in bipartite systems, as quantified by a Bell-type inequality, is finally proposed as a conclusion.

Ferrero, M.; Sánchez-Gómez, J. L.

2013-06-01

86

Possibility and evidence theory-based design optimization: an overview  

Microsoft Academic Search

Purpose – To survey the approaches to design optimization based on possibility theory and evidence theory comparatively, as well as their prominent characteristics mainly for epistemic uncertainty. Design\\/methodology\\/approach – Owing to uncertainties encountered in engineering design problems and limitations of the conventional probabilistic approach in handling the impreciseness of data or knowledge, the possibility-based design optimization (PBDO), evidence-based design optimization

Li-Ping He; Fu-Zheng Qu

2008-01-01

87

Theory of friction based on brittle fracture  

USGS Publications Warehouse

A theory of friction is presented that may be more applicable to geologic materials than the classic Bowden and Tabor theory. In the model, surfaces touch at the peaks of asperities and sliding occurs when the asperities fail by brittle fracture. The coefficient of friction, ??, was calculated from the strength of asperities of certain ideal shapes; for cone-shaped asperities, ?? is about 0.1 and for wedge-shaped asperities, ?? is about 0.15. For actual situations which seem close to the ideal model, observed ?? was found to be very close to 0.1, even for materials such as quartz and calcite with widely differing strengths. If surface forces are present, the theory predicts that ?? should decrease with load and that it should be higher in a vacuum than in air. In the presence of a fluid film between sliding surfaces, ?? should depend on the area of the surfaces in contact. Both effects are observed. The character of wear particles produced during sliding and the way in which ?? depends on normal load, roughness, and environment lend further support to the model of friction presented here. ?? 1967 The American Institute of Physics.

Byerlee, J. D.

1967-01-01

88

Modeling Crowd Behavior Based on Social Comparison Theory: Extended Abstract  

Microsoft Academic Search

Modeling crowd behavior is an important challenge for cog- nitive modelers. We propose a novel model of crowd behavior, based on Festinger's Social Comparison Theory, a social psychology theory known and expanded since the early 1950's. We propose a concrete framework for SCT, and evaluate its implementations in several crowd behavior scenarios. The results show improved performance over existing models.

Natalie Fridman; Gal A. Kaminka

2006-01-01

89

Psychosocial environments of black colleges: A theory-based assessment  

Microsoft Academic Search

Holland's theory of person environment interactions has considerable potential for helping to integrate environmental psychology with personality social psychology. This study applied measures based on his theory to the environments of black colleges. Compared to the U.S. labor force as a whole, blacks are over represented in social service careers and under represented in technical and managerial careers, and it

James M. Richards

1987-01-01

90

Theory-Based Approaches to the Concept of Life  

ERIC Educational Resources Information Center

|In this paper, I argue that characterisations of life through lists of properties have several shortcomings and should be replaced by theory-based accounts that explain the coexistence of a set of properties in living beings. The concept of life should acquire its meaning from its relationships with other concepts inside a theory. I illustrate…

El-Hani, Charbel Nino

2008-01-01

91

Linking empirically based theory and evaluation: The family bereavement program  

Microsoft Academic Search

We have illustrated how our “small theory” (Lipsey, 1990) of bereavement guided the development and evaluation of a preventive intervention for bereaved children. Our small theory, based on prior empirical research, enabled us to identify family processes that appeared to mediate the effects of parental death on child mental health. Our intervention was designed to attempt to change these processes.

Irwin N. Sandler; Stephen G. West; Louise Baca; David R. Pillow; Joanne C. Gersten; Fred Rogosch; Lynn Virdin; Janette Beals; Kim D. Reynolds; Carl Kallgren; Jenn-Yun Tein; Gary Kriege; Eloise Cole; Rafael Ramirez

1992-01-01

92

Reasserting theory in professionally based initial teacher education  

Microsoft Academic Search

Conceptions of theory within initial teacher education in England are adjusting to new conditions where most learning how to teach is school-based. Student teachers on a programme situated primarily in an employing school were monitored within a practitioner enquiry by their university programme tutors according to how they progressively understood theory. The tutors meanwhile also focused on how their own

Elaine Hodson; Kim Smith; Tony Brown

2012-01-01

93

Unsupervised Segmentation for Color Image Based on Graph Theory  

Microsoft Academic Search

Image segmentation method based on graph theory is mainly used for gray images, and thresholding of segmentation should be predefined. Combining with entropy in information theory, this paper suggests an unsupervised method for color image segmentation. The image is mapped into an weighted undirected graph, the pixels are considered as nodes, the best thresholding is obtained by objective function of

Zhiguang Cao; Xuexi Zhang; Xuezhu Mei

2008-01-01

94

Theory-Based Approaches to the Concept of Life  

ERIC Educational Resources Information Center

In this paper, I argue that characterisations of life through lists of properties have several shortcomings and should be replaced by theory-based accounts that explain the coexistence of a set of properties in living beings. The concept of life should acquire its meaning from its relationships with other concepts inside a theory. I illustrate…

El-Hani, Charbel Nino

2008-01-01

95

Aggregated Framework of Enterprise Information System Based on Synergic Theory  

Microsoft Academic Search

\\u000a Based on synergic theory and integrated method, this paper aims to find out the proper solution for the aggregated information\\u000a systems in manufacture enterprises. It puts forward the integration framework of information system according to synergic\\u000a theory, which is based on the technology of Data Mining and Web Services. And it includes 2 parts: the inner synergic framework\\u000a such as

Li Gang; Wei Quan

2006-01-01

96

Theory-based Evaluation and Learning: Possibilities and Challenges  

Microsoft Academic Search

Originated in the 1970s, decried in the 1990s, theory-based evaluation recaptured debate at the European Evaluation Society conference in 2002. The promise is that the set-up, implementation, delivery and utilization of evaluation research may be facilitated by taking the assumptions and objectives of public policy as a starting point. In addition, a theory-based approach is considered to be valuable for

PETER VA N DER

97

Classifying bases for 6D F-theory models  

NASA Astrophysics Data System (ADS)

We classify six-dimensional F-theory compactifications in terms of simple features of the divisor structure of the base surface of the elliptic fibration. This structure controls the minimal spectrum of the theory. We determine all irreducible configurations of divisors ("clusters") that are required to carry nonabelian gauge group factors based on the intersections of the divisors with one another and with the canonical class of the base. All 6D F-theory models are built from combinations of these irreducible configurations. Physically, this geometric structure characterizes the gauge algebra and matter that can remain in a 6D theory after maximal Higgsing. These results suggest that all 6D supergravity theories realized in F-theory have a maximally Higgsed phase in which the gauge algebra is built out of summands of the types su(3), so(8), f4, e6, e8, e8, (g2 ? su(2)); and su(2) ? so(7) ? su(2), with minimal matter content charged only under the last three types of summands, corresponding to the non-Higgsable cluster types identified through F-theory geometry. Although we have identified all such geometric clusters, we have not proven that there cannot be an obstruction to Higgsing to the minimal gauge and matter configuration for any possible F-theory model. We also identify bounds on the number of tensor fields allowed in a theory with any fixed gauge algebra; we use this to bound the size of the gauge group (or algebra) in a simple class of F-theory bases.

Morrison, David R.; Taylor, Washington

2012-10-01

98

A Theory for Memory-Based Learning  

Microsoft Academic Search

A memory-based learning system is an extended memory management system that decomposes the input space either statically or dynamically into subregions for the purpose of storing and retrieving functional information. The main generalization techniques employed by memory-based learning systems are the nearest-neighbor search, space decomposition techniques, and clustering. Research on memory-based learning is still in its early stage. In particular,

Jyh-Han Lin; Jeffrey Scott Vitter

1994-01-01

99

Queuing Delay Models for Single-Lane Roundabouts.  

National Technical Information Service (NTIS)

This article presents an analytical model for a few important operational characteristics of single-lane roundabouts in the United States. In particular, we obtain renewal-based analytical expressions for the mean and variance of the time required for ent...

A. Flannery J. P. Kharoufeh L. Elefteriadou N. Gautam

2005-01-01

100

Queuing Network Modeling of Driver Workload and Performance  

Microsoft Academic Search

Drivers overloaded with information significantly in- crease the chance of vehicle collisions. Driver workload, which is a multidimensional variable, is measured by both performance- based and subjective measurements and affected by driver age differences. Few existing computational models are able to cover these major properties of driver workload or simulate subjective mental workload and human performance at the same time.

Changxu Wu; Yili Liu

2007-01-01

101

The bases of effective field theories  

NASA Astrophysics Data System (ADS)

With reference to the equivalence theorem, we discuss the selection of basis operators for effective field theories in general. The equivalence relation can be used to partition operators into equivalence classes, from which inequivalent basis operators are selected. These classes can also be identified as containing Potential-Tree-Generated (PTG) operators, Loop-Generated (LG) operators, or both, independently of the specific dynamics of the underlying extended models, so long as it is perturbatively decoupling. For an equivalence class containing both, we argue that the basis operator should be chosen from among the PTG operators, because they may have the largest coefficients. We apply this classification scheme to dimension-six operators in an illustrative Yukawa model as well in the Standard Model (SM). We show that the basis chosen by Grzadkowski et al. [5] for the SM satisfies this criterion. In this light, we also revisit and verify our earlier result [6] that the dimension-six corrections to the triple-gauge-boson couplings only arise from LG operators, so the magnitude of the coefficients should only be a few parts per thousand of the SM gauge coupling if BSM dynamics respects decoupling. The same is true of the quartic-gauge-boson couplings.

Einhorn, Martin B.; Wudka, José

2013-11-01

102

Integral Theory for Supersonic Turbulent Base Flows.  

National Technical Information Service (NTIS)

The integral near-wake analysis of Reeves and Lees developed for supersonic laminar base flows with viscous-inviscid interaction is extended to the case of fully turbulent separated adiabatic flow behind a rearward-facing step at supersonic speeds. A turb...

I. E. Alber L. Lees

1968-01-01

103

Useful Theories in School-Based Consultation.  

ERIC Educational Resources Information Center

Mental health, behavioral, and process consultation models are described as three theoretical approaches to the practice of school-based consultation. Drawing from each of these models, an ecological model of consultation is offered as a conceptual umbrella for planning entry, assessment, intervention, and evaluation activities with handicapped…

Conoley, Jane Close; Conoley, Collie W.

1988-01-01

104

Remote Queued Service Observing at Canada-France-Hawaii Telescope  

NASA Astrophysics Data System (ADS)

The Canada-France-Hawaii Telescope moved to remote observing from its Waimea headquarters in February 2011. Before remote operations, Queue Scheduled Observations were performed from the summit of Maunakea by one Observing Assistant (OA) and one Service Observer (SO). The OA was in charge of the dome, telescope, associated systems, and weather monitoring, while the SO was in charge of executing appropriate observations based on scientific priorities and sky conditions. Under the new Remote Observing scheme, only one staff member, the Remote Observer, performs all necessary duties remotely, without any staff member present at the summit facility. The training program designed and implemented to achieve remote observing is presented here.

Manset, Nadine; Burdullis, Todd; Devost, Daniel

2011-03-01

105

Control theory-based foundations of self-controlling software  

Microsoft Academic Search

The authors' control theory based paradigm gives a framework for specifying and designing software that controls itself as it operates. Based on this paradigm, their self controlling software model supports three levels of control: feedback, adaptation, and reconfiguration. We believe this model can lead to software systems with an impressive capability for responding, adapting, and reconfiguring. Of course, self-controllability does

Mieczyslaw M. Kokar; Kenneth Baclawski; Yonet A. Eracar

1999-01-01

106

A Novel Shot Detection Algorithm Based on Information Theory  

Microsoft Academic Search

As a crucial step in content-based video retrieval, shot boundary detection has attracted much more research interesting in recent years, but many of the algorithms proposed in the literatures are not robust to mosaic, flash lamp and motion of camera and object. A novel shot boundary detection algorithm based on information theory is presented in this paper. It can detect

Yufeng Li; Zheng Zhao

2008-01-01

107

Theory and Practice of Case-Based Learning Aids  

Microsoft Academic Search

Case-based reasoning (CBR), as a cognitive model, values the concrete over the abstract (Kolodner, 1993). While most traditional theories of cognition emphasize how general- purpose abstract operators are formed and applied, case-based reasoning makes concrete cases, representing experience, primary. CBR suggests that we think in terms of cases — interpretations of our experiences that we apply to new situations. To

Janet L. Kolodner; Mark Guzdial

108

A K-means Clustering Approach Based on Grey Theory  

Microsoft Academic Search

A lot of clustering algorithms based on grey system theory, especially based on the grey relational matrix, have been already reported, which finds out a centroid of each class by moving given objects as vectors. We developed new clustering procedure called grey K-means, which is able to handle the number of required clusters such as the hard K-means or the

Daisuke Yamaguchi; Guo-Dong Li; K. Mizutani; T. Akabane; M. Nagai; M. Kitaoka

2006-01-01

109

Congestion at Card and Book Catalogs--A Queuing Theory Approach.  

ERIC Educational Resources Information Center

The question of whether a library's catalog should consist of cards arranged in a single alphabetical order (the "dictionary catalog) or be segregated as a separate file is discussed. Development is extended to encompass related problems involved in the creation of a book catalog. A model to study the effects of congestion at the catalog is…

Bookstein, Abraham

110

Effects of Diversity and Procrastination in Priority Queuing Theory: the Different Power Law Regimes  

Microsoft Academic Search

Empirical analysis show that, after the update of a browser, the publication\\u000aof the vulnerability of a software, or the discovery of a cyber worm, the\\u000afraction of computers still using the older version, or being not yet patched,\\u000aor exhibiting worm activity decays as power laws $\\\\sim 1\\/t^{\\\\alpha}$ with $0 <\\u000a\\\\alpha \\\\leq 1$ over time scales of years.

A. Saichev; Didier Sornette

2009-01-01

111

Effects of diversity and procrastination in priority queuing theory: The different power law regimes  

Microsoft Academic Search

Empirical analyses show that after the update of a browser, or the publication of the vulnerability of a software, or the discovery of a cyber worm, the fraction of computers still using the older browser or software version, or not yet patched, or exhibiting worm activity decays as a power law ˜1\\/talpha with 0

A. Saichev; D. Sornette

2010-01-01

112

Grid resource management policies for load-balancing and energy-saving by vacation queuing theory  

Microsoft Academic Search

The resource management is the central component of grid system. The analysis of the workload log file of LCG including the job arrival and the resource utilization daily cycle shows that the idle sites in the Grid are the source of load imbalance and energy waste. Here we focus on these two issues: balancing the workload by transferring jobs to

Fei Yin; Changjun Jiang; Rong Deng; Jianjun Yuan

2009-01-01

113

Model for chromatographic separations based on renewal theory  

SciTech Connect

A simple but reasonably realistic model is formulated for describing the behavior of chromatographic peaks. Our approach is based on statistical concepts and completely avoids the physically nonexistent theoretical plates of classical theory. This work complements the rate theory of chromatography in that we provide a more detailed look at the resistance to mass-transfer process (what we call the interphase process). The model is a stochastic one; because molecular level processes are random in nature, we feel that this is a natural approach. Although a variety of stochastic models have been proposed previously, they have been damaged by the necessity of assuming a particular mechanism. The present theory is largely immune from this criticism. The paper makes use of results from the theory of renewal processes, but the results should be comprehensible to anyone with only a modest acquaintance with statistical notions.

Scott, D.M.; Fritz, J.S.

1984-08-01

114

Nel's category theory based differential and integral Calculus, or did Newton know category theory ?  

Microsoft Academic Search

In a series of publications in the early 1990s, L D Nel set up a study of non-normable topological vector spaces based on methods in category theory. One of the important results showed that the classical operations of derivative and integral in Calculus can in fact be obtained by a rather simple construction in categories. Here we present this result

Elemer E Rosinger

2005-01-01

115

Urban Road Congestion Pricing Based on Game Theory  

Microsoft Academic Search

Researches on urban road congestion pricing method are the core of congestion pricing theories. Firstly, the paper sets forth the objects and influencing factors of congestion pricing as a base. External congestion cost, traffic volume, traffic demand flexibility and urban economic development are key influencing factors. The congestion pricing method should be devised in accordance with its purposes, and the

Qing-yu Luo; Zhi-cai Juan; Lin-jie Gao

2009-01-01

116

Blood Vessel Segmentation from MRA Based on Boltzmann Theory  

Microsoft Academic Search

Segmentation is one of the most challenging problems in the field of medical image analysis, and blood vessels are especially difficult to extract. In this paper, we propose a novel method for segmentation of cerebral blood vessels from magnetic resonance angiography (MRA) images based on Boltzmann theory. The method is composed of three major steps: first, power-law transformation is applied

Shifeng Zhao; Mingquan Zhou; Li Dai; Yanlin Luo

2007-01-01

117

A Model of Statistics Performance Based on Achievement Goal Theory  

Microsoft Academic Search

Structural equation modeling techniques were used to test a model of statistics performance based on achievement goal theory. Data were collected after the midterm and final examinations in an introductory statistics course, and models were fit at each time point. Learning goals were positively related to the use of deep-processing strategies and to self-efficacy and were negatively related to test

Deborah L. Bandalos; Sara J. Finney; Jenenne A. Geske

2003-01-01

118

A Memory-Based Theory of Verbal Cognition  

ERIC Educational Resources Information Center

The syntagmatic paradigmatic model is a distributed, memory-based account of verbal processing. Built on a Bayesian interpretation of string edit theory, it characterizes the control of verbal cognition as the retrieval of sets of syntagmatic and paradigmatic constraints from sequential and relational long-term memory and the resolution of these…

Dennis, Simon

2005-01-01

119

A Natural Teaching Method Based on Learning Theory.  

ERIC Educational Resources Information Center

The natural teaching method is active and student-centered, based on schema and constructivist theories, and informed by research in neuroplasticity. A schema is a mental picture or understanding of something we have learned. Humans can have knowledge only to the degree to which they have constructed schemas from learning experiences and practice.…

Smilkstein, Rita

1991-01-01

120

A Memory-Based Theory of Verbal Cognition  

ERIC Educational Resources Information Center

|The syntagmatic paradigmatic model is a distributed, memory-based account of verbal processing. Built on a Bayesian interpretation of string edit theory, it characterizes the control of verbal cognition as the retrieval of sets of syntagmatic and paradigmatic constraints from sequential and relational long-term memory and the resolution of these…

Dennis, Simon

2005-01-01

121

Factors affecting internship satisfaction: Based on organizational socialization theory  

Microsoft Academic Search

Internship is not only the learning tools but also a good chance for college students to understand the workplace culture and his or her future working role within the organization. Based on organizational socialization theory, this empirical study analyzes the factors affecting college students' internship satisfaction. The major finding is that: the organizational socialization tactics adopted by the organizations and

He Huang; Jia Jia

2010-01-01

122

Color Matching Algorithm Based on Computational 'Color Constancy' Theory  

Microsoft Academic Search

This paper describes a new color appearance matching method based on color constancy theory. In order to achieve good color appearance matching between different color devices such as a CRT-monitor and a printer, whose whites are quite different, the method recovers the hypothetical surface reflectances of objects and the hypothetical spectral power distribution of the illumination in a scene. The

Masato Tsukada; Johji Tajima

1999-01-01

123

Theory-Based Evaluation: The Case of Social Funds  

ERIC Educational Resources Information Center

The theory-based evaluation approach documents the assumptions implicit in program design and points to the data required to test these assumptions. Collecting and analyzing such data through quantitative and qualitative techniques enhances understanding of the validity of the assumptions and the relevance of key program processes. This article…

Carvalho, Soniya; White, Howard

2004-01-01

124

Game theory-based Cooperation of Process Planning and Scheduling  

Microsoft Academic Search

One of the significant trends in manufacturing planning is to make computer automated process planning and scheduling to work more cooperatively. To build up cooperative process planning and scheduling (CPPS), in this research, three game theory- based strategies, i.e., Pareto strategy, Nash strategy and Stackelberg strategy, have been introduced to analyze the cooperation of the two functions in a systematic

W. D. Li; L. Gao; X. Y. Li; Y. Guo

2008-01-01

125

Xinjiang resources efficiency based on superior technical theory  

Microsoft Academic Search

The new concept about the resource efficiency in Xinjiang has been discussed in this study based on the advanced technology theory in policy making perspective. The analysis is focused on the resources advantage in the development, resource pressure, resource efficiency and technical approach to resource efficiency. The idea of industrialized development centered on resource efficiency, its control factors and basic

Aniwaer Amut; Zeyuan Li

2005-01-01

126

Information Security Problem Research Based on Game Theory  

Microsoft Academic Search

The purpose of this paper is to resolve information security problem in the mobile electronic commerce industry chain. We analyze information security based on evolutionary game theory. In this paper, we set up the information security game model with penalty parameter, calculate replicator dynamics, and analyze the evolutionary stable strategy of the game model. The result reveals that reducing the

Wei Sun; Xiangwei Kong; Dequan He; Xingang You

2008-01-01

127

An improved Voronoi diagram model based on fuzzy interval theory  

Microsoft Academic Search

Considering that the application of traditional Voronoi diagram in spatial division ignores the impact of road hierarchy, speed, road-block, one-way and some other influential factors on proximity, an improved Voronoi diagram model based on fuzzy interval theory is proposed in this paper by introducing different influential factors into the construction of Voronoi diagram in order to enhance the accuracy of

Beibei Yan; Zhenfeng Shao; Yang Zhou; Qimin Cheng

2009-01-01

128

Corporate social responsibility and innovation: a resource-based theory  

Microsoft Academic Search

Purpose – The purpose of this paper is to analyze the bidirectional relationship between corporate social responsibility (CSR) practices and innovation according to the resource-based theory. Design\\/methodology\\/approach – Based on a sample formed by companies with investments in R&D for the 2003-2007 period worldwide, a bidirectional model is defined, one model in which the innovation realized by companies is a

Isabel Gallego-Álvarez; José Manuel Prado-Lorenzo; Isabel-María García-Sánchez

2011-01-01

129

Innovating Method of Existing Mechanical Product Based on TRIZ Theory  

NASA Astrophysics Data System (ADS)

Main way of product development is adaptive design and variant design based on existing product. In this paper, conceptual design frame and its flow model of innovating products is put forward through combining the methods of conceptual design and TRIZ theory. Process system model of innovating design that includes requirement analysis, total function analysis and decomposing, engineering problem analysis, finding solution of engineering problem and primarily design is constructed and this establishes the base for innovating design of existing product.

Zhao, Cunyou; Shi, Dongyan; Wu, Han

130

[Brazilian scientific production based on Orem's nursing theory: integrative review].  

PubMed

Integrative review, held in the databases LILACS, SciELO and BDENF from January 2005 to May 2009, aimed to summarize the Brazilian scientific production based on Orem's Nursing Theory. We obtained 23 articles, analyzed by simple descriptive statistics. It was found that 100% of the studies focused on adults. Of this total, 65,22% returned to the chronicle diseases. In 39,15% of the searches, the theory was used in full and in 34,80% one of the constructs. 91,30% of publications aimed to the construction and deployment of the structured and theoretically grounded practice of care. It was concluded that the theory has been used as theoretical and philosophical basis to justify the practice of nursing in a variety of situations in order to emphasize the role of the nurse in the care. PMID:23032347

Raimondo, Maria Lúcia; Fegadoli, Débora; Méier, Marineli Joaquim; Wall, Marilene Loewen; Labronici, Liliana Maria; Raimondo-Ferraz, Maria Isabel

131

Computer-based Training in Medicine and Learning Theories.  

PubMed

Computer-based training (CBT) systems can efficiently support modern teaching and learning environments. In this paper, we demonstrate on the basis of the case-based CBT system CAMPUS that current learning theories and design principles (Bloom's Taxonomy and practice fields) are (i) relevant to CBT and (ii) are feasible to implement using computer-based training and adequate learning environments. Not all design principles can be fulfilled by the system alone, the integration of the system in adequate teaching and learning environments therefore is essential. Adequately integrated, CBT programs become valuable means to build or support practice fields for learners that build domain knowledge and problem-solving skills. Learning theories and their design principles can support in designing these systems as well as in assessing their value. PMID:16160267

Haag, Martin; Bauch, Matthias; Garde, Sebastian; Heid, Jörn; Weires, Thorsten; Leven, Franz-Josef

2005-01-01

132

Two-scale mechanism-based theory of nonlinear viscoelasticity  

NASA Astrophysics Data System (ADS)

The paper presents a mechanism-based two-scale theory for a generalized nonlinear viscoelastic continuum. The continuum is labeled as generalized since it contains extra degrees of freedom typical of past high-order continuum theories, though a new formulation is presented here tailored to meet the needs of the physical description of the viscoelastic solid. The microstress that appears in the equations, often criticized for a lack of physical meaning, is assigned in this work to viscous free chains superimposed on a nonlinear elastic backbone composed of crosslinks and reinforcement. Mathematically, hyperelasticity is used to describe the equilibrium backbone (macroscale), and an improvement of tube models for reptation dynamics describes the free chain motion at the microscale. Inhomogeneous deformation is described by inclusion of a microstrain gradient into the formulation. Thus, the theory is nicely suited for materials with microstructure where localization of strains and inhomogeneous deformation occur in addition to viscoelastic damping mechanisms due to free chains. Besides the microstress, physical meaning of the additional boundary conditions arising in the general theory is also presented. Since the proposed material model is mechanism-based, macroscopic performances are functions of microstructural variables describing the polymer chemistry so that parametric material design concepts may be gleaned from the model. Several physical phenomena are captured through numerical simulation of the class of materials of interest: size effects, strain localization, and the fracture process. Results agree qualitatively with both experimental data and direct numerical simulation for filled elastomeric solids.

Tang, Shan; Steven Greene, M.; Liu, Wing Kam

2012-02-01

133

Adapting Learning Theories in Mobile Game-Based Learning Development  

Microsoft Academic Search

The learning experiences through mobile device can be expected from the learning activities and the mobile contents such as games and mobile applications. This paper presents an approach to develop a mobile game-based learning (mGBL) by adapting a review of learning theories and approaches. The review reveals a few characteristics that interconnected to the mGBL. In adapting the characteristics, mGBL

Syamsul Bahrin Zaibon; Norshuhada Shiratuddin

2010-01-01

134

Weighted portfolio selection models based on possibility theory  

Microsoft Academic Search

In this paper, we discuss portfolio selection problem in a fuzzy uncertain environment. Based on the Fullér’s and Zhang’s\\u000a notations, we discuss some properties of weighted lower and upper possibilistic means and variances as in probability theory.\\u000a We further present two weighted possibilistic portfolio selection models with bounded constraint, which can be transformed\\u000a to linear programming problems under the assumption

Wei Chen

2009-01-01

135

A Theory of Measurement Uncertainty Based on Conditional Probability  

Microsoft Academic Search

A theory of measurement uncertainty is presented, which, since it is based\\u000aexclusively on the Bayesian approach and on the subjective concept of\\u000aconditional probability, is applicable in the most general cases.\\u000a The recent International Organization for Standardization (ISO)\\u000arecommendation on measurement uncertainty is reobtained as the limit case in\\u000awhich linearization is meaningful and one is interested only in

Giulio D'Agostini

1996-01-01

136

Sensor Fusion for SLAM Based on Information Theory  

Microsoft Academic Search

We present a sensor fusion management technique based on information theory in order to reduce the uncertainty of map features\\u000a and the robot position in SLAM. The method is general, has no extra postulated conditions, and its implementation is straightforward.\\u000a We calculate an entropy weight matrix which combines the measurements and covariance of each sensor device to enhance reliability\\u000a and

Xinzheng Zhang; Ahmad B. Rad; Yiu-Kwong Wong; Yan Liu; Xuemei Ren

2010-01-01

137

A Liquidity-Based Theory of Closed-End Funds  

Microsoft Academic Search

This paper develops a rational, liquidity-based model of closed-end funds (CEFs) that provides an economic motivation for the existence of this organizational form: They offer a means for investors to buy illiquid securities, without facing the potential costs associated with direct trading and without the externalities imposed by an open-end fund structure. Our theory predicts the patterns observed in CEF

Martin Cherkes; Jacob Sagi; Richard Stanton

2009-01-01

138

A Liquidity-Based Theory of Closed-End Funds  

Microsoft Academic Search

This paper develops a rational, liquidity-based model of closed-end funds (CEFs) that provides an economic motivation for the existence of this organizational form: They oer a means for investors to buy illiquid securities, without facing the potential costs associated with direct trading and without the externalities imposed by an open-end fund structure. Our theory predicts the patterns observed in CEF

Martin Cherkes; Jacob Sagi; Richard Stanton

2005-01-01

139

Resource-Based Theory and Market-Driven Management  

Microsoft Academic Search

Market-Driven Management poses the question of the relationship between markets and competitive advantage. Market-driven firms reveal a superior ability to understand, attract and maintain, a supply of products\\/services that offer more value for the customer than competitors. The Resource-Based Theory originates from Penrose's idea (1959) of the firm as a coordinated 'bundle' of resources that the business has at its

Mauro Sciarelli

2008-01-01

140

A Theory-Based Transport Model With Comprehensive Physics  

Microsoft Academic Search

A new theory based transport model with comprehensive physics (trapping, general toroidal geometry, finite beta, collisions) has been developed. The core of the model is the new trapped-gyro-Landau-fluid (TGLF) equations [1] which provide a fast and accurate approximation to the linear eigenmodes of drift-wave instabilities (trapped ion and electron modes, ion and electron temperature gradient modes and kinetic ballooning modes).

G. M. Staebler

2006-01-01

141

A theory-based transport model with comprehensive physics  

Microsoft Academic Search

A new theory-based transport model with comprehensive physics (trapping, general toroidal geometry, fully electromagnetic, electron-ion collisions, impurity ions) has been developed. The core of the model is the new trapped-gyro-Landau-fluid (TGLF) equations, which provide a fast and accurate approximation to the linear eigenmodes for gyrokinetic drift-wave instabilities (trapped ion and electron modes, ion and electron temperature gradient modes, and kinetic

G. M. Staebler; J. E. Kinsey; R. E. Waltz

2007-01-01

142

Product Technology Maturity Prediction Based on TRIZ Technical Evolution Theory  

Microsoft Academic Search

It is critical for enterprise decision-makers to predict the technology maturity of product. The forecast result directly related to the research and development (R&D)decision-making. This paper introduces a new approach towards the product technology maturity assessment, product technology maturity prediction based on TRIZ technical evolution theory, and take MP3 player as an example to introduce the implementation of this methods.

He Bingquan; Shan Lingxin; Bao Likai; Liang Yi

2010-01-01

143

Pathogenesis of Chronic Pancreatitis: An Evidence-Based Review of Past Theories and Recent Developments  

Microsoft Academic Search

In the past several decades, four prominent theories of chronic pancreatitis pathogenesis have emerged: the toxic-metabolic theory, the oxidative stress hypothesis, the stone and duct obstruction theory, and the necrosis-fibrosis hypothesis. Although these traditional theories are formulated based on compelling scientific observations, substantial contradictory data also exist for each. Furthermore, the basic premises of some of these theories are directly

Tyler Stevens; Darwin L. Conwell; Gregory Zuccaro

2004-01-01

144

A Selective Review on Recent Development of Displacement-Based Laminated Plate Theories  

Microsoft Academic Search

This paper reviews the recent development of displacement-based theories for laminated composite plates as well as corresponding finite element models. Discussion focuses on the accuracy and efficiency of various theories, and the detailed expression of typical displacement theories used herein is also presented. To objectively assess these theories, Pagano's cylindrical bending problems are chosen for comparison of various theories. Numerical

Chen Wanji; Wu Zhen

2008-01-01

145

Doubly special relativity theories as different bases of ?-Poincaré algebra  

Microsoft Academic Search

Doubly Special Relativity (DSR) theory is a theory with two observer-independent scales, of velocity and mass (or length). Such a theory has been proposed by Amelino-Camelia as a kinematic structure which may underline quantum theory of relativity. Recently another theory of this kind has been proposed by Magueijo and Smolin. In this Letter we show that both these theories can

J Kowalski-Glikman; S Nowak

2002-01-01

146

Scheduling with Relaxed Constraint for ATM-like Input-Queued Crossbar Switching Fabric in IP Router  

Microsoft Academic Search

Scheduling scheme for ATM-like input-queued crossbar switching fabric in 1P router performs a critical role in IP router. However, there is a problem among the existing scheduling schemes: when an IP router with a large number of outputs (e.g. 64, 128 or more) is connected to ouly a few nodes (e.g. 2 or 1 nodes, where the node may be

Lixiang Xiong; Don Platt; Guoqiang Mao

2006-01-01

147

Scheduling with relaxed constraint for ATM-like input-queued crossbar switching fabric in IP router  

Microsoft Academic Search

A scheduling scheme for ATM-like input-queued crossbar switching fabric in the IP router performs a critical role in the IP router. However, there is a problem among the existing scheduling schemes: when an IP router with a large number of outputs (e.g. 64, 128 or more) is connected to only a few nodes (e.g. 2 or 4 nodes, where the

Lixiang Xiong; Don Platt; Guoqiang Mao

2004-01-01

148

Design a general-purpose network teaching platform based on blended learning theory  

Microsoft Academic Search

Considering classroom teaching and online learning as a whole, the activities of teachers and students in the network teaching platform are designed, based on blended learning theory, activity theory and constructivism learning theory. The network teaching platform emphasizes activity and task as its cores, ensuring learning resources and building a learning community. Based on activity theory model, this paper presents

Sun Haimin

2012-01-01

149

DEVELOPMENT OF A WEB-BASED LEARNING ENVIRONMENT BASED ON THE CONCEPT OF GOAL SETTING THEORY  

Microsoft Academic Search

This paper describes the development of a web- based learning environment based on the concept of goal setting theory. In this learning environment, some aids and tools are provided to help learners setting and achieving their learning goals on reading. In contrast with traditional learning environment, learners have more possibilities to make their decisions on a web-based learning environment. Therefore,

Jie Chi Yang; Chih Hung Lai; Tak Wai Chan; Tzu Chien Liu

150

A Danger-Theory-Based Immune Network Optimization Algorithm  

PubMed Central

Existing artificial immune optimization algorithms reflect a number of shortcomings, such as premature convergence and poor local search ability. This paper proposes a danger-theory-based immune network optimization algorithm, named dt-aiNet. The danger theory emphasizes that danger signals generated from changes of environments will guide different levels of immune responses, and the areas around danger signals are called danger zones. By defining the danger zone to calculate danger signals for each antibody, the algorithm adjusts antibodies' concentrations through its own danger signals and then triggers immune responses of self-regulation. So the population diversity can be maintained. Experimental results show that the algorithm has more advantages in the solution quality and diversity of the population. Compared with influential optimization algorithms, CLONALG, opt-aiNet, and dopt-aiNet, the algorithm has smaller error values and higher success rates and can find solutions to meet the accuracies within the specified function evaluation times.

Li, Tao; Xiao, Xin; Shi, Yuanquan

2013-01-01

151

Some exact results in supersymmetric theories based on exceptional groups  

NASA Astrophysics Data System (ADS)

We begin an investigation of supersymmetric theories based on exceptional groups. The flat directions are most easily parametrized using their correspondence with gauge-invariant polynomials. Symmetries and holomorphy tightly constrain the superpotentials, but due to multiple gauge invariants other techniques are needed for their full determination. We give an explicit treatment of G2 and find gaugino condensation for Nf<=2, and an instanton generated superpotential for Nf=3. The analogy with SU(Nc) gauge theories continues with modified and unmodified quantum moduli spaces for Nf=4 and Nf=5, respectively, and a non-Abelian Coulomb phase for Nf>=6. Electric variables suffice to describe this phase over the full range of Nf. The Appendix gives a self-contained introduction to G2 and its invariant tensors.

Giddings, Steven B.; Pierre, John M.

1995-11-01

152

Effects of gauge theory based number scaling on geometry  

NASA Astrophysics Data System (ADS)

Effects of local availability of mathematics (LAM) and space time dependent number scaling on physics and, especially, geometry are described. LAM assumes separate mathematical systems as structures at each space time point. Extension of gauge theories to include freedom of choice of scaling for number structures, and other structures based on numbers, results in a space time dependent scaling factor based on a scalar boson field. Scaling has no effect on comparison of experimental results with one another or with theory computations. With LAM all theory expressions are elements of mathematics at some reference point. Changing the reference point introduces (external) scaling. Theory expressions with integrals or derivatives over space or time include scaling factors (internal scaling) that cannot be removed by reference point change. Line elements and path lengths, as integrals over space and/or time, show the effect of scaling on geometry. In one example, the scaling factor goes to 0 as the time goes to 0, the big bang time. All path lengths, and values of physical quantities, are crushed to 0 as t goes to 0. Other examples have spherically symmetric scaling factors about some point, x. In one type, a black scaling hole, the scaling factor goes to infinity as the distance, d, between any point y and x goes to 0. For scaling white holes, the scaling factor goes to 0 as d goes to 0. For black scaling holes, path lengths from a reference point, z, to y become infinite as y approaches x. For white holes, path lengths approach a value much less than the unscaled distance from z to x.

Benioff, Paul

2013-05-01

153

A communication-theory based view on telemedical communication.  

PubMed

Communication theory based analysis sheds new light on the use of health telematics. This analysis of structures in electronic medical communication shows communicative structures with special features. Current and evolving telemedical applications are analyzed. The methodology of communicational theory (focusing on linguistic pragmatics) is used to compare it with its conventional counterpart. The semiotic model, the roles of partners, the respective message and their relation are discussed. Channels, sender, addressee, and other structural roles are analyzed for different types of electronic medical communication. The communicative processes are shown as mutual, rational action towards a common goal. The types of communication/texts are analyzed in general. Furthermore the basic communicative structures of medical education via internet are presented with their special features. The analysis shows that electronic medical communication has special features compared to everyday communication: A third participant role often is involved: the patient. Messages often are addressed to an unspecified partner or to an unspecified partner within a group. Addressing in this case is (at least partially) role-based. Communication and message often directly (rather than indirectly) influence actions of the participants. Communication often is heavily regulated including legal implications like liability, and more. The conclusion from the analysis is that the development of telemedical applications so far did not sufficiently take communicative structures into consideration. Based on these results recommendations for future developments of telemedical applications/services are given. PMID:15537236

Schall, Thomas; Roeckelein, Wolfgang; Mohr, Markus; Kampshoff, Joerg; Lange, Tim; Nerlich, Michael

2003-01-01

154

Theoretical study of biped gait planning based on optimization theory  

NASA Astrophysics Data System (ADS)

In this paper, based on the complex optimization theory, the gait planning of biped robots is studied theoretically and a method of biped gait planning is proposed. This method is developed by taking the general model of biped robots as the object of study, so it is suitable to all kinds of biped robots. It can be used not only in the gait plannings of static walking but in those of dynamic walking. In order that this method can be used correctly, some technicalities are explained and discussed yet in the paper.

Tan, Guanzheng

1995-08-01

155

Density Functional Theory-Based Database Development and CALPHAD Automation  

NASA Astrophysics Data System (ADS)

We report our research activities on density functional theory-based alloy thermodynamics, including method/software developments, the integration of first-principles calculations, CALPHAD modeling, and the automation of phase diagram calculations. Examples to be discussed include phonon dispersions of rhombohedral BiFeO3, the solution to the long-outstanding problem of imaginary phonon frequencies for cubic perovskites using EuTiO3 as an example, the calculation of excess specific heat for the magnetic phase transition in EuTiO3, and the automated calculation of a phase diagram for the Al-Mg system.

Wang, Yi; Shang, Shunli; Chen, Long-Qing; Liu, Zi-Kui

2013-09-01

156

Identifying influential nodes in weighted networks based on evidence theory  

NASA Astrophysics Data System (ADS)

The design of an effective ranking method to identify influential nodes is an important problem in the study of complex networks. In this paper, a new centrality measure is proposed based on the Dempster-Shafer evidence theory. The proposed measure trades off between the degree and strength of every node in a weighted network. The influences of both the degree and the strength of each node are represented by basic probability assignment (BPA). The proposed centrality measure is determined by the combination of these BPAs. Numerical examples are used to illustrate the effectiveness of the proposed method.

Wei, Daijun; Deng, Xinyang; Zhang, Xiaoge; Deng, Yong; Mahadevan, Sankaran

2013-05-01

157

A conventional theory of mechanism-based strain gradient plasticity  

NASA Astrophysics Data System (ADS)

Experiments have repeatedly shown that metallic materials display strong size effect at the micron and submicron scales when non-uniform plastic deformation exists. These experiments, as well as direct dislocation simulations, therefore, confirmed the existence of a material length scale for plasticity. However, the conventional plasticity theories possess no intrinsic material length and can not explain the above observations, which leading to the considerable recent interest in developing size dependent plasticity theories governing the plastic deformation in small volumes. It is strongly believed that the size effect is attributed to geometrically necessary dislocations associated with non-uniform plastic deformation. There are, however, many dislocations at the micron scale such that their collective behavior on plastic work hardening of materials should be characterized by a continuum plasticity theory. We developed a conventional theory of mechanism-based strain gradient plasticity (CMSG) established from Taylor dislocation model but does not involve the higher-order stress. Through several examples of micro-bend, micro-torsion, and void growth, we have shown that CMSG can capture the size effect observed in experiments. CMSG is used to investigate the stress field around the tip of an interface crack between Nb and sapphire and has shown that the stress at the crack tip is high enough to trigger cleavage cracking in presence of plastic flow in ductile material. CMSG is also used to study the indentation size effect (ISE) observed in micro and nanoindentation experiments. Different hardness trends with different indenter shapes obtained from CMSG agree very well with the experimental measurement.

Qu, Shaoxing

158

Examination of some parameters of the kinematic model of SS433 based on an alternative theory of special relativity theory  

Microsoft Academic Search

On the basis of a new examination of the Michelson-Morley experiment, a theory is suggested, based on two principles and not on Lorentz transformations. The physical vacuum conception was revisited. Under these assumptions some parameters of the kinematic model of SS433 were reconsidered. A coincidence of some data of the theory with the special relativity conclusions for SS433 was noted

M. G. Larionov

1993-01-01

159

Propagation theories of partially coherent electromagnetic fields based on coherent or separated-coordinate mode decomposition  

Microsoft Academic Search

Propagation theories of partially coherent electromagnetic fields based on coherent mode decomposition or separated-coordinate mode decomposition are proposed. With the proposed propagation theories, various powerful theories for the propagation of fully coherent electromagnetic fields can be used for the propagation of partially coherent electromagnetic fields. The proposed theories are applicable to any propagation problem of partially coherent electromagnetic fields governed

Haitao Liu; Guoguang Mu; Lie Lin

2006-01-01

160

Application of Monte Carlo simulation to cavity theory based on the virtual electron source concept  

Microsoft Academic Search

A cavity theory based on the application of the electron transport equation in the cavity and the surrounding medium, referred to as L-L cavity theory in this paper, is discussed. The L-L cavity theory is a very detailed theory that considers electron production in the cavity as well as in the wall, and is applicable to all cavity sizes. The

Yuchuan Fu; Zhengming Luo

2002-01-01

161

Decibel error test and flow law of multiphase rocks based on energy dissipation theory  

Microsoft Academic Search

A new flow law is developed based on energy dissipation theory, which is independent of bound theory. The influence of the distribution of constituent minerals on the rheological behavior of the rock is taken into account and expressed as an additional continuity condition in the theory instead of the lower and upper bounds in bound theory. With the continuity equations,

Yan Jiang; Shaoxian Zang; Rongqiang Wei

2005-01-01

162

Buckling analysis of micro- and nano-rods\\/tubes based on nonlocal Timoshenko beam theory  

Microsoft Academic Search

This paper is concerned with the elastic buckling analysis of micro- and nano-rods\\/tubes based on Eringen's nonlocal elasticity theory and the Timoshenko beam theory. In the former theory, the small scale effect is taken into consideration while the effect of transverse shear deformation is accounted for in the latter theory. The governing equations and the boundary conditions are derived using

C M Wang; Y Y Zhang; Sai Sudha Ramesh; S Kitipornchai

2006-01-01

163

A Theory-Based Approach to Teaching Young Children About Health: A Recipe for Understanding  

Microsoft Academic Search

The theory–theory account of conceptual development posits that children's concepts are integrated into theories. Concept-learning studies have documented the central role that theories play in children's learning of experimenter-defined categories but have yet to extensively examine complex, real-world concepts, such as health. The present study examined whether providing young children with coherent and causally related information in a theory-based lesson

Simone P. Nguyen; Mary Beth McCullough; Ashley Noble

2011-01-01

164

Dynamical Theories of Electromagnetism and Superconductivity Based on Gauge Invariance and Energy  

Microsoft Academic Search

a. Electromagnetic theory I frame the theory using nonstandard notions of work and energy. The energy transferred to a control volume is classically characterized by the Poynting vector E H, an identification based on an integral balance derived from Maxwell’s equations and linear constitutive relations. I begin instead with a concept of energy-transfer based on experience with theories of deformation

Morton E. Gurtin

1997-01-01

165

Validating a Theory-Based Survey to Evaluate Teaching Effectiveness in Higher Education  

ERIC Educational Resources Information Center

Surveys to evaluate instructor effectiveness are commonly used in higher education. Yet the survey items included are often drawn from other surveys without reference to a theory of adult learning. The authors present the results from a validation study of such a theory-based survey. They evidence that an evaluation survey based on a theory that…

Amrein-Beardsley, A.; Haladyna, T.

2012-01-01

166

A Theory of Conditioning: Inductive Learning within Rule-Based Default Hierarchies.  

ERIC Educational Resources Information Center

|A theory of classical conditioning is presented, which is based on a parallel, rule-based performance system integrated with mechanisms for inductive learning. A major inferential heuristic incorporated into the theory involves "unusualness," which is focused on novel cues. The theory is implemented via computer simulation. (TJH)|

Holyoak, Keith J.; And Others

1989-01-01

167

Xinjiang resources efficiency based on superior technical theory  

NASA Astrophysics Data System (ADS)

The new concept about the resource efficiency in Xinjiang has been discussed in this study based on the advanced technology theory in policy making perspective. The analysis is focused on the resources advantage in the development, resource pressure, resource efficiency and technical approach to resource efficiency. The idea of industrialized development centered on resource efficiency, its control factors and basic technical framework for realization of resource efficiency factors, which include technique in application of recycled materials; water-saving technique oriented for efficiency in applying water resource; bio-technology for high yield and better quality of farm crops; comprehensive technique involved in farm-produce further process and agricultural industrialization; information technology around information support and information-oriented society; technique in transforming resources including oil and natural gas, mineral products and wind power; technique in control of desertification and biological security.

Amut, Aniwaer; Li, Zeyuan

2005-09-01

168

Constraining queuing delay in WDM rings based on multi-token access protocol under asymmetrical traffic  

Microsoft Academic Search

WDM optical packet rings are a promising candidate for next generation metropolitan area networks (MAN), which are expected to support an increasing amount of traffic coming from a variety of applications and services (e.g., video on demand, video broadcasting, IP telephony). In this paper, we focus on multi-token WDM rings, where for each wavelength channel a special control packet, i.e.,

P. G. Raponi; N. Andriolli; P. Castoldi; M. Puleri

2010-01-01

169

Optimisation of a honeybee-colony's energetics via social learning based on queuing delays  

NASA Astrophysics Data System (ADS)

Natural selection shaped the foraging-related processes of honeybees in such a way that a colony can react to changing environmental conditions optimally. To investigate this complex dynamic social system, we developed a multi-agent model of the nectar flow inside and outside of a honeybee colony. In a honeybee colony, a temporal caste collects nectar in the environment. These foragers bring their harvest into the colony, where they unload their nectar loads to one or more storer bees. Our model predicts that a cohort of foragers, collecting nectar from a single nectar source, is able to detect changes in quality in other food sources they have never visited, via the nectar processing system of the colony. We identified two novel pathways of forager-to-forager communication. Foragers can gain information about changes in the nectar flow in the environment via changes in their mean waiting time for unloadings and the number of experienced multiple unloadings. This way two distinct groups of foragers that forage on different nectar sources and that never communicate directly can share information via a third cohort of worker bees. We show that this noisy and loosely knotted social network allows a colony to perform collective information processing, so that a single forager has all necessary information available to be able to 'tune' its social behaviour, like dancing or dance-following. This way the net nectar gain of the colony is increased.

Thenius, Ronald; Schmickl, Thomas; Crailsheim, Karl

2008-06-01

170

Reasoning about Object-based Calculi in (Co)Inductive Type Theory and the Theory of Contexts  

Microsoft Academic Search

Abstract. We illustrate a methodology for formalizing and reasoning about Abadi and Cardel-li's object-based calculi, in (co)inductive type theory, such as the Calculus of (Co)Inductive Constructions, by taking advantage of Natural Deduction Semantics and coinduction in com-bination with weak Higher-Order Abstract Syntax and the Theory of Contexts. Our methodology allows to implement smoothly the calculi in the target metalanguage; moreover,

Alberto Ciaffaglione; Luigi Liquori; Marino Miculan

2007-01-01

171

A discrete event simulation model for evaluating the performances of an m/g/c/c state dependent queuing system.  

PubMed

M/G/C/C state dependent queuing networks consider service rates as a function of the number of residing entities (e.g., pedestrians, vehicles, and products). However, modeling such dynamic rates is not supported in modern Discrete Simulation System (DES) software. We designed an approach to cater this limitation and used it to construct the M/G/C/C state-dependent queuing model in Arena software. Using the model, we have evaluated and analyzed the impacts of various arrival rates to the throughput, the blocking probability, the expected service time and the expected number of entities in a complex network topology. Results indicated that there is a range of arrival rates for each network where the simulation results fluctuate drastically across replications and this causes the simulation results and analytical results exhibit discrepancies. Detail results that show how tally the simulation results and the analytical results in both abstract and graphical forms and some scientific justifications for these have been documented and discussed. PMID:23560037

Khalid, Ruzelan; Nawawi, Mohd Kamal M; Kawsar, Luthful A; Ghani, Noraida A; Kamil, Anton A; Mustafa, Adli

2013-04-01

172

A Discrete Event Simulation Model for Evaluating the Performances of an M/G/C/C State Dependent Queuing System  

PubMed Central

M/G/C/C state dependent queuing networks consider service rates as a function of the number of residing entities (e.g., pedestrians, vehicles, and products). However, modeling such dynamic rates is not supported in modern Discrete Simulation System (DES) software. We designed an approach to cater this limitation and used it to construct the M/G/C/C state-dependent queuing model in Arena software. Using the model, we have evaluated and analyzed the impacts of various arrival rates to the throughput, the blocking probability, the expected service time and the expected number of entities in a complex network topology. Results indicated that there is a range of arrival rates for each network where the simulation results fluctuate drastically across replications and this causes the simulation results and analytical results exhibit discrepancies. Detail results that show how tally the simulation results and the analytical results in both abstract and graphical forms and some scientific justifications for these have been documented and discussed.

Khalid, Ruzelan; M. Nawawi, Mohd Kamal; Kawsar, Luthful A.; Ghani, Noraida A.; Kamil, Anton A.; Mustafa, Adli

2013-01-01

173

Grounded Theory-Based Research within Exercise Psychology: A Critical Review  

Microsoft Academic Search

This article critically reviews the current body of grounded theory research within exercise psychology. Previous evidence has questioned the quality of grounded theory research within this academic domain. Guidelines for assessing grounded theory research are presented based on the common defining characteristics of the methodology and other published recommendations for assessing qualitative research. The review identified 21 articles that report

Andrew J. Hutchison; Lynne Johnston; Jeff Breckon

2011-01-01

174

On the Completeness of Approximation Based Reasoning and Planning in Action Theories with Incomplete Information  

Microsoft Academic Search

In this paper, we study the completeness of the 0- approximation for action theories with incomplete informa- tion. We propose a sufficient condition for which an action theory under the 0-approximation semantics is complete with respect to the possible world semantics. We then introduce the notion of decisive sets of fluents, based on which an ac- tion theory can be

Tran Cao Son; Phan Huy Tu

2006-01-01

175

Hovering Control of Unmanned Small Size Helicopter Based on Adaptive Inverse Control Theory  

Microsoft Academic Search

Adaptive inverse control (AIC) theory is introduced to inhibit interferences such as side wind during hovering control for small-sized unmanned helicopter. Based on this theory, an AIC control block diagram is improved to accommodate with the characteristics of helicopter hovering model and robust design. According to structure and fundamental theory of small-sized unmanned helicopter, a hover flight experimental platform is

Li Jin-song; Cao Xi; Yan Guo-zheng; Song Li-bo

2010-01-01

176

On normal theory based inference for multilevel models with distributional violations  

Microsoft Academic Search

Data in social and behavioral sciences are often hierarchically organized though seldom normal, yet normal theory based inference procedures are routinely used for analyzing multilevel models. Based on this observation, simple adjustments to normal theory based results are proposed to minimize the consequences of violating normality assumptions. For characterizing the distribution of parameter estimates, sandwich-type covariance matrices are derived. Standard

Ke-Hai Yuan; Peter M. Bentler

2002-01-01

177

LSST Telescope Alignment Plan Based on Nodal Aberration Theory  

NASA Astrophysics Data System (ADS)

The optical alignment of the Large Synoptic Survey Telescope (LSST) is potentially challenging, due to its fast three-mirror optical design and its large 3.5° field of view (FOV). It is highly advantageous to align the three-mirror optical system prior to the integration of the complex science camera on the telescope, which corrects the FOV via three refractive elements and includes the operational wavefront sensors. A telescope alignment method based on nodal aberration theory (NAT) is presented here to address this challenge. Without the science camera installed on the telescope, the on-axis imaging performance of the telescope is diffraction-limited, but the field of view is not corrected. The nodal properties of the three-mirror telescope design have been analyzed and an alignment approach has been developed using the intrinsically linear nodal behavior, which is linked via sensitivities to the misalignment parameters. Since mirror figure errors will exist in any real application, a methodology to introduce primary-mirror figure errors into the analysis has been developed and is also presented.

Sebag, J.; Gressler, W.; Schmid, T.; Rolland, J. P.; Thompson, K. P.

2012-04-01

178

Extended target detection in complex background based on fractal theory  

NASA Astrophysics Data System (ADS)

The man-made target detection in natural background based on fractal theory has many advantages compared to traditional detection methods. While using single fractal feature to detect target, particularly extended target, is not robust in practice. Combing fractal feature with fractal scale invariance, a novel algorithm for extended target detection in complex background was proposed in this paper. First, through analyzing the self-similarity of fractal surface, the fractal feature named area measurement was developed to preliminary extract the target and the edges of image. According to the preliminary extraction result and the characteristic of extended target, potential target regions were detected. Then, the function of fractal area measurement changing with scale was proposed. Giving adaptive threshold, the backgrounds in potential target regions were eliminated by fractal scale invariance. Finally, the background conglutination was removed through mathematical morphology method if required. Experimental results demonstrate that the algorithm can detect extended target in complex background correctly and reliably, and the shape details of the target is reserved perfectly.

Zhang, Kun-Hua; Zhang, Qi-Heng; Yang, Xuan

2009-05-01

179

School-based theories of pupil assessment: a case study.  

PubMed

Case study design was used in this investigation of the pupil assessment theories of two middle school physical education teachers whose program was identified as a good program in which pupil assessment was taking place. An assumption guiding the study was that teachers' actions are rational and are designed to produce desired results. Therefore, a comparison is made only between two theories of action (espoused and enacted) rather than between theory and practice. Informal and semistructured interviews were employed to elicit teachers' espoused theories, and enacted theories were identified during field visits over a semester in which classes were observed and school documents examined. Teachers' theories of assessment are identified for the categories of participation, effort, and improvement; grading; written tests; fitness testing; performance tests; and formative recordkeeping. Espoused and enacted theories are then examined for congruency. The highest level of incongruency was found in the areas of performance tests and formative recordkeeping. Barriers to the use of pupil assessment techniques in this program include organizational, knowledge, and contextual factors. Change in the assessment practices of secondary teachers may be facilitated, however, through the identification and examination of teachers' theories of assessment by both preservice and inservice teachers. PMID:1574661

Veal, M L

1992-03-01

180

Information and communication theory. Citations from the NTIS data base  

NASA Astrophysics Data System (ADS)

This bibliography cites Government sponsored research information and communication theory, including coding, decoding, and transmission of signals. Individual studies are cited on radio, television, and digital communication systems. Pure theory is also included. This updated bibliography contains 187 abstracts, 78 of which are new entries to the previous edition.

Carrigan, B.

1980-04-01

181

Laser-scanner grid map building based on Dempster-Shafer evidence theory  

Microsoft Academic Search

A method of constructing a grid map based on Dempster-Shafer evidence theory (D-S evidence theory) is proposed with respect to the problem of unstructured unknown environment mapping. Mobile robot explores environment with a laser scanner. D-S evidence theory is used to fuse information. The problem that D-S evidence theory can't be applied to information fusion under certain circumstances and the

Hongyu Cao; Hanxu Sun; Qingxuan Jia; Ping Ye; Chengkun Shi

2009-01-01

182

Multi-Index Fusion-Based Fault Diagnosis Theories and Methods  

NASA Astrophysics Data System (ADS)

In this paper, using the information theory and the statistics analysis method, we have established the theory and method of faults diagnosis based on the multi-index fusion, including the information theory of multi-index diagnosis, diagnosis ability testing, indexes selecting, and Bayesian diagnosis modelling. And then, we applied the theories and methods to analyse the piston-liner wear condition of a diesel engine. In that, satisfactory results are achieved.

Wu, X.; Chen, J.; Wang, W.; Zhou, Y.

2001-09-01

183

Multi-ultrasonic-sensor grid map building based on DS evidence theory  

Microsoft Academic Search

A method of constructing and maintaining a grid map using ultrasonic sensors based on Dempster-Shafer evidence theory (D-S evidence theory) is proposed with respect to the problem of unstructured unknown environment exploration and mapping. Mobile robot moving in an environment explores with ultrasonic sensors; D-S evidence theory is used to fuse information; The problem that D-S evidence theory can't be

Cao Hongyu; Sun Hanxu; Jia Qingxuan; Zheng Yili

2009-01-01

184

Microscopic theory of semiconductor-based optoelectronic devices  

NASA Astrophysics Data System (ADS)

Since the seminal paper by Esaki and Tsu, semiconductor-based nanometric heterostructures have been the subject of impressive theoretical and experimental activity due to their high potential impact in both fundamental research and device technology. The steady scaling down of typical space and time scales in quantum optoelectronic systems inevitably leads to a regime in which the validity of the traditional Boltzmann transport theory cannot be taken for granted and a more general quantum-transport description is imperative. In this paper, we shall review state-of-the-art approaches used in the theoretical modelling, design and optimization of optoelectronic quantum devices. The primary goal is to provide a cohesive treatment of basic quantum-transport effects, able to explain and predict the performances of new-generation semiconductor devices. With this aim, we shall review and discuss a fully three-dimensional microscopic treatment of time-dependent as well as steady-state quantum-transport phenomena, based on the density matrix formalism. This will allow us to introduce in a quite natural way the separation between coherent and incoherent processes. Starting with this general theoretical framework, we shall analyse two different types of quantum devices, namely periodically repeated structures and quantum systems with open boundaries. For devices within the first class, we will show how a proper use of periodic boundary conditions allows us to reproduce and predict their current-voltage characteristics without resorting to phenomenological parameters. For the second class of devices, we will address the relevant issue of a quantum treatment of charge transport in systems with open boundaries (electrical contacts) when studying and simulating an at least two-terminal device.

Iotti, Rita C.; Rossi, Fausto

2005-11-01

185

Queuing for Union Jobs and the Social Return to Schooling. Institute for Research on Poverty Discussion Papers. Report 360-76.  

ERIC Educational Resources Information Center

An analysis of the argument that a market imperfection (wage differentials and queuing caused by unions) raises the marginal social product (MSP) of college education above the average before-tax private wage premium (APP) for college (this discrepancy is called a union-Q-nality) focuses on verifying five hypotheses: (1) Workers with identical…

Bishop, John

186

An approach to theory-based youth programming.  

PubMed

A key but often overlooked aspect of intentional, out-of-school-time programming is the integration of a guiding theoretical framework. The incorporation of theory in programming can provide practitioners valuable insights into essential processes and principles of successful programs. While numerous theories exist that relate to youth development practice, they often remain inaccessible to practitioners. Therefore, the goal of this article is to synthesize two theoretical perspectives, the social development model and self-determination theory, into a practitioner-friendly programming framework. The resulting social development programming model outlines specific components, processes, and outcomes of effective and intentional youth development programs. PMID:22028104

Duerden, Mat D; Gillard, Ann

2011-01-01

187

Toward A Brain-Based Theory of Beauty  

PubMed Central

We wanted to learn whether activity in the same area(s) of the brain correlate with the experience of beauty derived from different sources. 21 subjects took part in a brain-scanning experiment using functional magnetic resonance imaging. Prior to the experiment, they viewed pictures of paintings and listened to musical excerpts, both of which they rated on a scale of 1–9, with 9 being the most beautiful. This allowed us to select three sets of stimuli–beautiful, indifferent and ugly–which subjects viewed and heard in the scanner, and rated at the end of each presentation. The results of a conjunction analysis of brain activity showed that, of the several areas that were active with each type of stimulus, only one cortical area, located in the medial orbito-frontal cortex (mOFC), was active during the experience of musical and visual beauty, with the activity produced by the experience of beauty derived from either source overlapping almost completely within it. The strength of activation in this part of the mOFC was proportional to the strength of the declared intensity of the experience of beauty. We conclude that, as far as activity in the brain is concerned, there is a faculty of beauty that is not dependent on the modality through which it is conveyed but which can be activated by at least two sources–musical and visual–and probably by other sources as well. This has led us to formulate a brain-based theory of beauty.

Ishizu, Tomohiro; Zeki, Semir

2011-01-01

188

A new multicomponent surface tension correlation based on scaling theory  

SciTech Connect

This paper presents a multicomponent surface tension correlation based on scaling theory. In addition to particular exponents employed, the correlation contains two new features: A corresponding-states equation is derived for a correlation coefficient, commonly referred to as a parachor. As a result, the hydrocarbon pseudocomponent parachors can be calculated through this equation, once their pseudocritical properties are estimated. An approach is proposed to calculate the parachors of mixtures. In contrast to the conventional approach, which calculates the mixture parachor via molar mixing of component parachors, this approach first obtains the pseudocritical properties of the mixture and then employs the corresponding-states equation to calculate the mixture parachor. For various reservoir-fluid related pure components, the corresponding-states equation predicts parachor values to within 1% of those listed in the literature. The surface-tension correlation developed was tested against 45 sets of measured binary surface tension data and four sets of multicomponent CO/sub 2/-reservoir oil surface tension data. Other existing surface tension correlations, i.e. Weinaug-Katz's and Stegmeier-Hough's correlations, are also tested and compared. For the 45 sets of binary data, the average deviation of the new surface tension correlation is 3.71%, which is about 50% smaller than the deviations of the other two correlation cited. In addition, for the CO/sub 2/-reservoir fluid data, the average deviation is about 7.3%, which is also a significant improvement over the existing correlations. It is worth noting that the surface tension correlation developed does not involve any adjusted parameter and it is also completely compatible with existing compositional numerical simulators.

Lee, S.T.; Chien, M.C.H.

1984-04-01

189

Bio-reflex-based robot adaptive motion controlling theory  

Microsoft Academic Search

The environment adaptability of robot motion can be effectively improved with bio-reflex theory which is a new research direction of robot motion-control. The paper introduces the basic theory of complete adaptive motion of robot with bio-reflex mechanism. As for the motion control of the robot, the traditional and the bio-reflex control methods are compared. The concept of a single system

Xiuli Zhang; Haojun Zheng; Guanghong Duan; Liyao Zhao

2002-01-01

190

Theory of mind and rule-based reasoning  

Microsoft Academic Search

The hypothesis is tested that during the preschool period a particular form of reasoning is applied to theory of mind and a set of problems that do not require the understanding of mental states. Three experiments each provided a different piece of support for this hypothesis. Experiment 1 found similar age-related changes between three standard theory-of-mind tasks (false belief, appearance-reality

Tibor Palfai; P. D. Zelazo

1995-01-01

191

Rethinking the theory of the hospital: a knowledge-based view  

Microsoft Academic Search

While the hospital is seen as a knowledge-intensive organization in the health services industry, it is conceptualized as an institution for integrating knowledge. This paper aims to explore the development of a knowledge-based theory of the hospital. Therefore, some concerns of the theory of the hospital from knowledge-based view (KBV) are addressed, particularly, the logic of the traditional theory of

Chen-Wei Yang; Shih-Chieh Fang; Julia L. Lin

2011-01-01

192

Rethinking the theory of the hospital: a knowledge-based view  

Microsoft Academic Search

While the hospital is seen as a knowledge-intensive organization in the health services industry, it is conceptualized as an institution for integrating knowledge. This paper aims to explore the development of a knowledge-based theory of the hospital. Therefore, some concerns of the theory of the hospital from knowledge-based view (KBV) are addressed, particularly, the logic of the traditional theory of

Chen-Wei Yang; Shih-Chieh Fang; Julia L. Lin

2012-01-01

193

Development of StopAdvisor: A theory-based interactive internet-based smoking cessation intervention.  

PubMed

Reviews of internet-based behaviour-change interventions have shown that they can be effective but there is considerable heterogeneity and effect sizes are generally small. In order to advance science and technology in this area, it is essential to be able to build on principles and evidence of behaviour change in an incremental manner. We report the development of an interactive smoking cessation website, StopAdvisor, designed to be attractive and effective across the social spectrum. It was informed by a broad motivational theory (PRIME), empirical evidence, web-design expertise, and user-testing. The intervention was developed using an open-source web-development platform, 'LifeGuide', designed to facilitate optimisation and collaboration. We identified 19 theoretical propositions, 33 evidence- or theory-based behaviour change techniques, 26 web-design principles and nine principles from user-testing. These were synthesised to create the website, 'StopAdvisor' (see http://www.lifeguideonline.org/player/play/stopadvisordemonstration). The systematic and transparent application of theory, evidence, web-design expertise and user-testing within an open-source development platform can provide a basis for multi-phase optimisation contributing to an 'incremental technology' of behaviour change. PMID:24073123

Michie, Susan; Brown, Jamie; Geraghty, Adam W A; Miller, Sascha; Yardley, Lucy; Gardner, Benjamin; Shahab, Lion; McEwen, Andy; Stapleton, John A; West, Robert

2012-09-01

194

Two-cell theory to measure membrane resistance based on proton flow: Theory development and experimental validation  

Microsoft Academic Search

A two-cell theory is developed to measure proton exchange membrane (PEM) resistance to proton flow during conduction through a PEM fuel cell. The theoretical framework developed herein is based upon fundamental thermodynamic principles and engineering laws. We made appropriate corrections to develop the theoretical model previously proposed by Babu and Nair (B.V. Babu, N. Nair, J. Energy Edu. Sci. Technol.

Susanta K. Das; K. J. Berry

2007-01-01

195

How Is a Science Lesson Developed and Implemented Based on Multiple Intelligences Theory?  

ERIC Educational Resources Information Center

|The purpose of this study is to present the whole process step-by-step of how a science lesson can be planned and implemented based on Multiple Intelligences (MI) theory. First, it provides the potential of the MI theory for science teaching and learning. Then an MI science lesson that was developed based on a modified model in the literature and…

Kaya, Osman Nafiz

2008-01-01

196

Development and Evaluation of a Theory-Based Physical Activity Guidebook for Breast Cancer Survivors  

Microsoft Academic Search

This study's objective was to develop and evaluate the suitability and appropriateness of a theory-based physical activity (PA) guidebook for breast cancer survivors. Guidebook content was constructed based on the theory of planned behavior (TPB) using salient exercise beliefs identified by breast cancer survivors in previous research. Expert judges completed the Maine Area Health Education Center's 18-item attribute checklist for

Jeffrey K. Vallance; Kerry S. Courneya; Lorian M. Taylor; Ronald C. Plotnikoff; John R. Mackey

2008-01-01

197

Development and Evaluation of a Theory-Based Physical Activity Guidebook for Breast Cancer Survivors  

ERIC Educational Resources Information Center

This study's objective was to develop and evaluate the suitability and appropriateness of a theory-based physical activity (PA) guidebook for breast cancer survivors. Guidebook content was constructed based on the theory of planned behavior (TPB) using salient exercise beliefs identified by breast cancer survivors in previous research. Expert…

Vallance, Jeffrey K.; Courneya, Kerry S.; Taylor, Lorian M.; Plotnikoff, Ronald C.; Mackey, John R.

2008-01-01

198

Improving Breast Cancer Control Among Latinas: Evaluation of a Theory-Based Educational Program  

Microsoft Academic Search

The study evaluated a theory-based breast cancer control program specially developed for less acculturated Latinas. The authors used a quasi-experimental design with random assignment of Latinas into experimental (n = 51) or control (n = 37) groups that completed one pretest and two posttest surveys. The experimental group received the educational program, which was based on Bandura's self-efficacy theory and

Shiraz I. Mishra; Leo R. Chavez; Patricia Nava; R. Burciaga Valdez; F. Allan Hubbell

1998-01-01

199

Quantum mechanical embedding theory based on a unique embedding potential  

SciTech Connect

We remove the nonuniqueness of the embedding potential that exists in most previous quantum mechanical embedding schemes by letting the environment and embedded region share a common embedding (interaction) potential. To efficiently solve for the embedding potential, an optimized effective potential method is derived. This embedding potential, which eschews use of approximate kinetic energy density functionals, is then used to describe the environment while a correlated wavefunction (CW) treatment of the embedded region is employed. We first demonstrate the accuracy of this new embedded CW (ECW) method by calculating the van der Waals binding energy curve between a hydrogen molecule and a hydrogen chain. We then examine the prototypical adsorption of CO on a metal surface, here the Cu(111) surface. In addition to obtaining proper site ordering (top site most stable) and binding energies within this theory, the ECW exhibits dramatic changes in the p-character of the CO 4{sigma} and 5{sigma} orbitals upon adsorption that agree very well with x-ray emission spectra, providing further validation of the theory. Finally, we generalize our embedding theory to spin-polarized quantum systems and discuss the connection between our theory and partition density functional theory.

Chen Huang [Department of Physics, Princeton University, Princeton, New Jersey 08544 (United States); Pavone, Michele; Carter, Emily A. [Department of Mechanical and Aerospace Engineering, Program in Applied and Computational Mathematics, and the Andlinger Center for Energy and the Environment, Princeton University, Princeton, New Jersey 08544-5263 (United States)

2011-04-21

200

A theory-based approach to designing student learning context  

Microsoft Academic Search

How can we keep technology-focused computing and software engineering students interested and engaged in a soft subject like HCI? How can we avoid leaving the less gifted and less enthused students behind in a 12-week module packed with theories, methodologies and with a new development tool to learn? This paper describes how educational research findings were deployed to address the

Jarinee Chattratichart

2007-01-01

201

A Theory of Computation Based on Quantum Logic (I)  

Microsoft Academic Search

The (meta)logic underlying classical theory of computation is Boolean (two- valued) logic. Quantum logic was proposed by Birkhoff and von Neumann as a logic of quantum mechanics more than sixty years ago. It is currently under- stood as a logic whose truth values are taken from an orthomodular lattice. The major difference between Boolean logic and quantum logic is that

Mingsheng Ying

2004-01-01

202

Research on advertising strategy based on game theory  

Microsoft Academic Search

In the period of product homogeneity, the competition of advertising is an important aspect of the nonprice competition among enterprises. The paper introduces the game theory in the field of economics into the study of issues in enterprise advertising campaign and analyzes the two-person game in advertising activity. The paper points out the advertising predicament the advertisers are facing in

Hengbo Du; Yanfeng Xu

2011-01-01

203

Effective Contraceptive Use: An Exploration of Theory-Based Influences  

ERIC Educational Resources Information Center

|The purpose of this study was to explore factors that influence oral contraceptive (OC) use among women in Iran using the Theory of Planned Behavior (TPB) and concept of self-efficacy (SE). The study sample consisted of 360 married OC users, aged 18-49 years recruited at public health centers of Mashhad, 900 km east of Tehran. SE had the…

Peyman, N.; Oakley, D.

2009-01-01

204

Teaching at a Distance--Reflections on the Relationship between Discipline-Based and General Teaching Theories.  

ERIC Educational Resources Information Center

Discusses development of Didaktik, a teaching and learning theory which investigates relationships between disciplined-based and general teaching theories; discusses the need for concretization of general teaching models in terms of discipline-based teaching theory in distance education; and postulates the necessity of a theory of distance…

Muller, Klaus; And Others

1985-01-01

205

A wavelet theory-based adaptive trend analysis system for process monitoring and diagnosis  

Microsoft Academic Search

We discuss the development of a wavelet theory-based adaptive system for trend analysis (W-ASTRA). W-ASTRA performs process-monitoring and diagnosis. The main contributions of this paper are two fold. A wavelet theory based nonlinear adaptive algorithm has been developed for identification of trends from sensor data. In order to perform diagnosis using the identified trends, a knowledge base is required. Our

Hiranmayee Vedam; Venkat Venkatasubramanian

1997-01-01

206

Local control theory in trajectory-based nonadiabatic dynamics  

NASA Astrophysics Data System (ADS)

In this paper, we extend the implementation of nonadiabatic molecular dynamics within the framework of time-dependent density-functional theory in an external field described in Tavernelli [Phys. Rev. APLRAAN1050-294710.1103/PhysRevA.81.052508 81, 052508 (2010)] by calculating on-the-fly pulses to control the population transfer between electronic states using local control theory. Using Tully’s fewest switches trajectory surface hopping method, we perform MD to control the photoexcitation of LiF and compare the results to quantum dynamics (QD) calculations performed within the Heidelberg multiconfiguration time-dependent Hartree package. We show that this approach is able to calculate a field that controls the population transfer between electronic states. The calculated field is in good agreement with that obtained from QD, and the differences that arise are discussed in detail.

Curchod, Basile F. E.; Penfold, Thomas J.; Rothlisberger, Ursula; Tavernelli, Ivano

2011-10-01

207

Local control theory in trajectory-based nonadiabatic dynamics  

SciTech Connect

In this paper, we extend the implementation of nonadiabatic molecular dynamics within the framework of time-dependent density-functional theory in an external field described in Tavernelli et al.[Phys. Rev. A 81, 052508 (2010)] by calculating on-the-fly pulses to control the population transfer between electronic states using local control theory. Using Tully's fewest switches trajectory surface hopping method, we perform MD to control the photoexcitation of LiF and compare the results to quantum dynamics (QD) calculations performed within the Heidelberg multiconfiguration time-dependent Hartree package. We show that this approach is able to calculate a field that controls the population transfer between electronic states. The calculated field is in good agreement with that obtained from QD, and the differences that arise are discussed in detail.

Curchod, Basile F. E.; Penfold, Thomas J.; Rothlisberger, Ursula; Tavernelli, Ivano [Laboratory of Computational Chemistry and Biochemistry, Ecole Polytechnique Federale de Lausanne, CH-1015 Lausanne (Switzerland); Laboratory of Computational Chemistry and Biochemistry, Ecole Polytechnique Federale de Lausanne, CH-1015 Lausanne, Switzerland, (Switzerland); Ecole Polytechnique Federale de Lausanne, Laboratoire de Spectroscopie Ultrarapide, ISIC, FSB-BSP, CH-1015 Lausanne, Switzerland, (Switzerland); SwissFEL, Paul Scherrer Institut, CH-5232 Villigen (Switzerland); Laboratory of Computational Chemistry and Biochemistry, Ecole Polytechnique Federale de Lausanne, CH-1015 Lausanne (Switzerland)

2011-10-15

208

A theory-based approach to teaching young children about health: A recipe for understanding  

PubMed Central

The theory-theory account of conceptual development posits that children’s concepts are integrated into theories. Concept learning studies have documented the central role that theories play in children’s learning of experimenter-defined categories, but have yet to extensively examine complex, real-world concepts such as health. The present study examined whether providing young children with coherent and causally-related information in a theory-based lesson would facilitate their learning about the concept of health. This study used a pre-test/lesson/post-test design, plus a five month follow-up. Children were randomly assigned to one of three conditions: theory (i.e., 20 children received a theory-based lesson); nontheory (i.e., 20 children received a nontheory-based lesson); and control (i.e., 20 children received no lesson). Overall, the results showed that children in the theory condition had a more accurate conception of health than children in the nontheory and control conditions, suggesting the importance of theories in children’s learning of complex, real-world concepts.

Nguyen, Simone P.; McCullough, Mary Beth; Noble, Ashley

2011-01-01

209

A Theory of Adaptable Contract-Based Service Composition  

Microsoft Academic Search

Service Oriented Architectures draw heavily on techniques for reusing and assembling off-the-shelf software compo- nents. While powerful, this programming practice is not without a cost: the software architect must ensure that the off-the-shelf components interact safely and in ways that conform with the specification. We develop a new theo- ry for adaptable service compositions. The theory pro- vides an effective

Giovanni Bernardi; Michele Bugliesi; Damiano Macedonio; Sabina Rossi

2008-01-01

210

Advertising ethics: A contextual response based on classical ethical theory  

Microsoft Academic Search

F. P. Bishop argues that the ethical standard for advertising practitioners must be utilitarian. Indeed, the utilitarian theory of ethics in decision-making has traditionally been the preference of U.S. advertising practitioners. This article, therefore, argues that the U.S. advertising industry's de-emphasis of deontological ethics is a reason for its continuing struggle with unfavorable public perceptions of its ethics — and

Cornelius B. Pratt; E. Lincoln James

1994-01-01

211

Literary pedagogy in nursing: a theory-based perspective.  

PubMed

Using fictional and autobiographical literature in nursing education is a primary way of understanding patients' lived experiences and fostering development of essential relational and reflective thinking skills. Application of literary theory to this pedagogic practice can expand conceptualization of teaching goals, inform specific teaching strategies, and potentially contribute to socially consequential educational outcomes. This article describes a theoretical schema that focuses on pedagogical goals in terms of the three related skills (i.e., reading, interpretation, criticism) of textual competence. PMID:12238895

Sakalys, Jurate A

2002-09-01

212

A collaborative spiral software process model based on Theory W  

Microsoft Academic Search

A primary difficulty in applying the spiral model has been the lack of explicit process guidance in determining the prospective system's objectives, constraints, and alternatives that get elaborated in each cycle. This paper presents an extension of the spiral model, called the Next Generation Process Model (NGPM), which uses the Theory W(win-win) approach (Boehm-Ross, 1989) to converge on a system's

Barry Boehm; Prasanta Bose

1994-01-01

213

Gravitational Cherenkov losses in theories based on modified Newtonian dynamics.  

PubMed

Survival of high-energy cosmic rays (HECRs) against gravitational Cherenkov losses is shown not to cast strong constraints on modified Newtonian dynamics (MOND) theories that are compatible with general relativity (GR): theories that coincide with GR for accelerations ?a(0) (a(0) is the MOND constant). The energy-loss rate, E, is many orders smaller than those derived in the literature for theories with no extra scale. Modification to GR, which underlies E, enters only beyond the MOND radius of the particle: r(M)=(Gp/ca(0))(1/2). The spectral cutoff, entering E quadratically, is thus r(M)(-1), not k(dB)=p/?. Thus, E is smaller than published rates, which use k(dB), by a factor ?(r(M)k(dB))(2)?10(39)(cp/3×10(11)??Gev)(3). Losses are important only beyond D(loss)?q?(M), where q is a dimensionless factor, and ?(M)=c(2)/a(0) is the MOND length, which is ?2? times the Hubble distance. PMID:21469855

Milgrom, Mordehai

2011-03-17

214

Circuit theory and model-based inference for landscape connectivity  

USGS Publications Warehouse

Circuit theory has seen extensive recent use in the field of ecology, where it is often applied to study functional connectivity. The landscape is typically represented by a network of nodes and resistors, with the resistance between nodes a function of landscape characteristics. The effective distance between two locations on a landscape is represented by the resistance distance between the nodes in the network. Circuit theory has been applied to many other scientific fields for exploratory analyses, but parametric models for circuits are not common in the scientific literature. To model circuits explicitly, we demonstrate a link between Gaussian Markov random fields and contemporary circuit theory using a covariance structure that induces the necessary resistance distance. This provides a parametric model for second-order observations from such a system. In the landscape ecology setting, the proposed model provides a simple framework where inference can be obtained for effects that landscape features have on functional connectivity. We illustrate the approach through a landscape genetics study linking gene flow in alpine chamois (Rupicapra rupicapra) to the underlying landscape.

Hanks, Ephraim M.; Hooten, Mevin B.

2013-01-01

215

Gravitational Cherenkov Losses in Theories Based on Modified Newtonian Dynamics  

NASA Astrophysics Data System (ADS)

Survival of high-energy cosmic rays (HECRs) against gravitational Cherenkov losses is shown not to cast strong constraints on modified Newtonian dynamics (MOND) theories that are compatible with general relativity (GR): theories that coincide with GR for accelerations ?a0 (a0 is the MOND constant). The energy-loss rate, E?, is many orders smaller than those derived in the literature for theories with no extra scale. Modification to GR, which underlies E?, enters only beyond the MOND radius of the particle: rM=(Gp/ca0)1/2. The spectral cutoff, entering E? quadratically, is thus rM-1, not kdB=p/?. Thus, E? is smaller than published rates, which use kdB, by a factor ˜(rMkdB)2?1039(cp/3×1011Gev)3. Losses are important only beyond Dloss?q?M, where q is a dimensionless factor, and ?M=c2/a0 is the MOND length, which is ?2? times the Hubble distance.

Milgrom, Mordehai

2011-03-01

216

Hybrid Genetic-Based Support Vector Regression with Feng Shui Theory for Appraising Real Estate Price  

Microsoft Academic Search

In this paper, we proposed a novel house prediction model that integrated hybrid genetic-based support vector regression (HGA-SVR) model and feng shui theories for developing a high accuracy appraising real estate price system in Taiwan. In Taiwan, feng shui theory applies in choosing good days, divination and house selection. From the past researches, many factors might affect the real estate

Chih-hung Wu; Chi-hua Li; I-ching Fang; Chin-chia Hsu; Wei-ting Lin; Chia-hsiang Wu

2009-01-01

217

Capturing Landscape Visual Character Using Indicators: Touching Base with Landscape Aesthetic Theory  

Microsoft Academic Search

This paper presents one way that landscape visual character can be captured using indicators derived from nine theory-based concepts related to landscape perception. The paper aims to establish links between landscape aesthetic theory and visual indicators, thus exploring what landscape indicators are really indicating. The steps from abstract visual concepts to measurable visual indicators are described, and links are made

Åsa Ode; Mari S. Tveit; Gary Fry

2008-01-01

218

Multi-agent Assessment on Marketing Risk Based on Evidence Theory  

Microsoft Academic Search

The paper aims to solving the problems on risk assessment in process of marketing through basic principles of evidence theory. First of all, the concept model on risk assessment based on evidence theory is established; then set agent parameters of marketing risk of a certain tinned beer, and establish the corresponding fuzzy membership function according to the marketing characteristics of

Qiwan Wang; Xuzhou Jiangsu

2009-01-01

219

The resource-based view of the firm and the labour theory of value  

Microsoft Academic Search

The paper argues that the principal components of the Resource- based view (R-BV) of the firm are not a sufficient basis for a complete and consistent theory of firm behaviour. Two important missing elements are governance arrangements and value theory. Whilst these missing elements have been acknowledged separately in the literature, their complementary interaction with the commonly accepted components of

Steven Toms

2005-01-01

220

Applying Ecological Theory to Advance the Science and Practice of School-Based Prejudice Reduction Interventions  

ERIC Educational Resources Information Center

|Several school-based racial prejudice-reduction interventions have demonstrated some benefit. Ecological theory serves as a framework within which to understand the limits and to enhance the efficacy of prejudice-reduction interventions. Using ecological theory, this article examines three prejudice-reduction approaches, including social…

McKown, Clark

2005-01-01

221

A hybrid machining simulator based on predictive machining theory and neural network modelling  

Microsoft Academic Search

A machining simulation system based on a hybrid machining model integrating the predictive machining theory developed by Oxley and neural network models for predicting machining characteristic factors is presented in this paper. The model consists of two components, an analytical component and a neural network component. The analytical component uses Oxley's predictive machining theory, from which the essential machining characteristics

X. P Li; K Iynkaran; A. Y. C Nee

1999-01-01

222

A model based on ant colony system and rough set theory to feature selection  

Microsoft Academic Search

In this paper we propose a hybrid approach to feature selection based on Ant Colony System algorithm and Rough Set Theory. Rough Set Theory offers the heuristic function to measure the quality of a single subset. We have studied the influence of the setting of the parameters for this problem, in particular for finding reducts. Experimental results show this hybrid

Rafael Bello; A. Nowe; Yaile Caballero; Yudel Gómez; Peter Vrancx

2005-01-01

223

Thermal buckling of functionally graded circular plates based on higher order shear deformation plate theory  

Microsoft Academic Search

In this research, thermal buckling of circular plates compose of functionally graded material (FGM) is considered. Equilibrium and stability equations of a FGM circular plate under thermal loads are derived, based on the higher order shear deformation plate theory (3rd order plate theory). Assuming that the material properties vary as a power form of the thickness coordinate variable z and

M. M. Najafizadeh; H. R. Heydari

2004-01-01

224

Patient and nurse experiences of theory-based care.  

PubMed

The pre-surgery nursing practice model derived from Newman's theory was developed to change the delivery of nursing care in a pre-surgical clinic. Guided by the theoretical knowledge of health as expanding consciousness, transpersonal caring, and reflective practice, key practice changes included a) incorporating Newman's praxis process, b) changing the physical space, and c) providing opportunities to reflect on practice. The purpose of this study was to utilize a phenomenological approach to evaluate a new model of care among 31 patients and 4 nurses. PMID:19342715

Flanagan, Jane

2009-04-01

225

Assembly models for Papovaviridae based on tiling theory  

NASA Astrophysics Data System (ADS)

A vital constituent of a virus is its protein shell, called the viral capsid, that encapsulates and hence provides protection for the viral genome. Assembly models are developed for viral capsids built from protein building blocks that can assume different local bonding structures in the capsid. This situation occurs, for example, for viruses in the family of Papovaviridae, which are linked to cancer and are hence of particular interest for the health sector. More specifically, the viral capsids of the (pseudo-) T = 7 particles in this family consist of pentamers that exhibit two different types of bonding structures. While this scenario cannot be described mathematically in terms of Caspar-Klug theory (Caspar D L D and Klug A 1962 Cold Spring Harbor Symp. Quant. Biol. 27 1), it can be modelled via tiling theory (Twarock R 2004 J. Theor. Biol. 226 477). The latter is used to encode the local bonding environment of the building blocks in a combinatorial structure, called the assembly tree, which is a basic ingredient in the derivation of assembly models for Papovaviridae along the lines of the equilibrium approach of Zlotnick (Zlotnick A 1994 J. Mol. Biol. 241 59). A phase space formalism is introduced to characterize the changes in the assembly pathways and intermediates triggered by the variations in the association energies characterizing the bonds between the building blocks in the capsid. Furthermore, the assembly pathways and concentrations of the statistically dominant assembly intermediates are determined. The example of Simian virus 40 is discussed in detail.

Keef, T.; Taormina, A.; Twarock, R.

2005-09-01

226

Assembly models for Papovaviridae based on tiling theory.  

PubMed

A vital constituent of a virus is its protein shell, called the viral capsid, that encapsulates and hence provides protection for the viral genome. Assembly models are developed for viral capsids built from protein building blocks that can assume different local bonding structures in the capsid. This situation occurs, for example, for viruses in the family of Papovaviridae, which are linked to cancer and are hence of particular interest for the health sector. More specifically, the viral capsids of the (pseudo-) T = 7 particles in this family consist of pentamers that exhibit two different types of bonding structures. While this scenario cannot be described mathematically in terms of Caspar-Klug theory (Caspar D L D and Klug A 1962 Cold Spring Harbor Symp. Quant. Biol. 27 1), it can be modelled via tiling theory (Twarock R 2004 J. Theor. Biol. 226 477). The latter is used to encode the local bonding environment of the building blocks in a combinatorial structure, called the assembly tree, which is a basic ingredient in the derivation of assembly models for Papovaviridae along the lines of the equilibrium approach of Zlotnick (Zlotnick A 1994 J. Mol. Biol. 241 59). A phase space formalism is introduced to characterize the changes in the assembly pathways and intermediates triggered by the variations in the association energies characterizing the bonds between the building blocks in the capsid. Furthermore, the assembly pathways and concentrations of the statistically dominant assembly intermediates are determined. The example of Simian virus 40 is discussed in detail. PMID:16224123

Keef, T; Taormina, A; Twarock, R

2005-09-13

227

Item Response Theory-Based Approaches for Computing Minimum Passing Scores from an Angoff-Based Standard-Setting Study  

ERIC Educational Resources Information Center

Even when the scoring of an examination is based on item response theory (IRT), standard-setting methods seldom use this information directly when determining the minimum passing score (MPS) for an examination from an Angoff-based standard-setting study. Often, when IRT scoring is used, the MPS value for a test is converted to an IRT-based theta…

Ferdous, Abdullah A.; Plake, Barbara S.

2008-01-01

228

A color-theory-based energy efficient routing algorithm for mobile wireless sensor networks  

Microsoft Academic Search

Wireless sensor networks (WSNs) with nodes spreading in a target area have abilities of sensing, computing, and communication. We adopted a range-free Color-theory based Dynamic Localization, CDL(1) (1)(1), to help identify each sensor node's location. Since sensor nodes are battery-powered, we propose a Color-theory-based Energy Efficient Routing (CEER) algorithm to prolong the life time of each sensor node. Each anchor

Tai-jung Chang; Kuochen Wang; Yi-ling Hsieh

2008-01-01

229

Efficient Color-theory-based Dynamic Localization for Mobile Wireless Sensor Networks  

Microsoft Academic Search

Location information is critical to mobile wireless sensor networks (WSN) applications. With the help of location information,\\u000a for example, routing can be performed more efficiently. In this paper, we propose a novel localization approach, Color-theory based Dynamic Localization (CDL), which is based on color theory to exploit localization in mobile WSNs. CDL makes use of the broadcast information, such as

Shen-Hai Shee; Tzu-Chien Chang; Kuochen Wang; Yi-Ling Hsieh

2011-01-01

230

Theory-based low-sodium diet education for heart failure patients.  

PubMed

Theory-based teaching strategies for promoting adherence to a low-sodium diet among patients with heart failure are presented in this article. The strategies, which are based on the theory of planned behavior, address patient attitude, subjective norm, and perceived control as patients learn how to follow a low-sodium diet. Home health clinicians can select a variety of the instructional techniques presented to meet individual patient learning needs. PMID:20592543

Welsh, Darlene; Marcinek, Regina; Abshire, Demetrius; Lennie, Terry A; Biddle, Martha; Bentley, Brooke; Moser, Debra K

231

Robust control based on quantitative feedback theory for PMSG wind power generation system  

Microsoft Academic Search

Based on the analysis of PMSG (permanent magnet synchronous generator) wind power system mathematical model, summarized the basic principles and design process of quantitative feedback theory, a PMSG-based wind power generation with parameter uncertainty controller is designed to capture maximum energy under rated wind speed. A PMSG wind power control system simulation model is established, based on the intuitive interface

Chen Qi; Meng Tao; Zhi-cheng Ji

2009-01-01

232

Linking Theory, Educational Constructs, and Instructional Strategies in Web-based Course Development  

Microsoft Academic Search

This chapter will present a description of links between educational constructs and corresponding principles of learning based on theory as they might be implemented in a Web-based course. Focusing on reflective, social and collegial, administrative and instructional aspects of Web-based courses, the chapter reviews literature related to the use of computer conferencing as a primary means of implementing sound instructional

Brenda Bannan-Ritland; William Bragg; Mauri Collins

233

Drama theory as the behavioural rationale in agent- based models  

Microsoft Academic Search

Agent-based modelling has recently developed as an important approach to understanding the collective behaviour of individuals interacting, especially in organised and disorganised groups such as organisations, markets or crowds. It has been used as the basis of simulations to explore the dynamics of such systems, and so to predict the implications of deliberate interventions or chance events. However, agent-based models,

J. W. Bryant

2004-01-01

234

Theory and practice in content-based ESL reading instruction  

Microsoft Academic Search

Most college ESL students are placed in developmental reading programs. To experience success in the mainstream college curriculum, they must achieve an adequate level of reading proficiency as quickly and as easily as possible. This paper advocates content-based reading instruction as an effective way to facilitate this process. After providing a rationale for the content-based approach, the paper then offers

Loretta Frances Kasper

1995-01-01

235

The Role of Culture Theory in Cross-Cultural Training: A Multimethod Study of Culture-Specific, Culture-General, and Culture Theory-Based Assimilators.  

ERIC Educational Resources Information Center

In a multimethod evaluation of cross-cultural training tools involving 102 exchange students at a midwestern university, a theory-based individualism and collectivism assimilator tool had significant advantages over culture-specific and culture-general assimilators and a control condition. Results support theory-based culture assimilators. (SLD)

Bhawuk, Dharm P. S.

1998-01-01

236

Community-based Practices: Integrating Dissemination Theory with Critical Theories of Power and Justice  

Microsoft Academic Search

This paper critically reviews two diverse intellectual traditions concerned with community-based interventions: the literature\\u000a on dissemination of community interventions and the critical psychology literature that is concerned with systemic power inequalities\\u000a and structural injustice. The dominant dissemination-of-innovations framework has shifted toward an emphasis on community,\\u000a yet it does not generally take into account issues of power and inequality within the

Jen Sandler

2007-01-01

237

Seismic data reconstruction based on CS and Fourier theory  

NASA Astrophysics Data System (ADS)

Traditional seismic data sampling follows the Nyquist sampling theorem. In this paper, we introduce the theory of compressive sensing (CS), breaking through the limitations of the traditional Nyquist sampling theorem, rendering the coherent aliases of regular undersampling into harmless incoherent random noise using random undersampling, and effectively turning the reconstruction problem into a much simpler denoising problem. We introduce the projections onto convex sets (POCS) algorithm in the data reconstruction process, apply the exponential decay threshold parameter in the iterations, and modify the traditional reconstruction process that performs forward and reverse transforms in the time and space domain. We propose a new method that uses forward and reverse transforms in the space domain. The proposed method uses less computer memory and improves computational speed. We also analyze the antinoise and anti-aliasing ability of the proposed method, and compare the 2D and 3D data reconstruction. Theoretical models and real data show that the proposed method is effective and of practical importance, as it can reconstruct missing traces and reduce the exploration cost of complex data acquisition.

Zhang, Hua; Chen, Xiao-Hong; Wu, Xin-Min

2013-06-01

238

The analysis of laminated composite plates based on the simple higher-order theory  

NASA Astrophysics Data System (ADS)

A simple method is developed for the analysis of laminated composite plates. The displacement equations of laminated plates based on the classical laminated theory including the effect of transverse shear deformation are presented. Numerical results indicated that the present theory predicts the deflections and stresses more accurately when compared to the first-order theory. For symmetric cross-ply laminates, the results (bending deflection, buckling load and natural frequency) obtained using present theory can also be obtained from the formulas of the classical laminated plate theory (CLT) as long as corresponding terms in these formulas of CLT are multiplied by those transverses shear effect coefficients which are proposed in this paper. The present displacement field can also be used for the analysis of the finite element methods.

Sun, Liangxin; Shi, Zhiyu

1992-06-01

239

Cis control of gene expression in E.coli by ribosome queuing at an inefficient translational stop signal  

PubMed Central

An UGA stop codon context which is inefficient because of the 3?-flanking context and the last two amino acids in the gene protein product has a negative effect on gene expression, as shown using a model protein A? gene. This is particularly true at low mRNA levels, corresponding to a high intracellular ribosome/mRNA ratio. The negative effect is smaller if this ratio is decreased, or if the distance between the initiation and termination signals is increased. The results suggest that an inefficient termination codon can cause ribosomal pausing and queuing along the upstream mRNA region, thus blocking translation initiation of short genes. This cis control effect is dependent on the stop codon context, including the C-terminal amino acids in the gene product, the translation initiation signal strength, the ribosome/mRNA ratio and the size of the mRNA coding region. A large proportion of poorly expressed natural Escherichia coli genes are small, and the weak termination codon UGA is under-represented in small, highly expressed E.coli genes as compared with the efficient stop codon UAA.

Jin, Haining; Bjornsson, Asgeir; Isaksson, Leif A.

2002-01-01

240

Solar Activity Predictions Based on Solar Dynamo Theories  

NASA Astrophysics Data System (ADS)

We review solar activity prediction methods, statistical, precursor, and recently the Dikpati and the Choudhury groups’ use of numerical flux-dynamo methods. Outlining various methods, we compare precursor techniques with weather forecasting. Precursors involve events prior to a solar cycle. First started by the Russian geomagnetician Ohl, and then Brown and Williams; the Earth's field variations near solar minimum was used to predict the next solar cycle, with a correlation of 0.95. From the standpoint of causality, as well as energetically, these relationships were somewhat bizarre. One index used was the "number of anomalous quiet days,” an antiquated, subjective index. Scientific progress cannot be made without some suspension of disbelief; otherwise old paradigms become tautologies. So, with youthful naïveté, Svalgaard, Scherrer, Wilcox and I viewed the results through rose-colored glasses and pressed ahead searching for understanding. We eventually fumbled our way to explaining how the Sun could broadcast the state of its internal dynamo to Earth. We noted one key aspect of the Babcock-Leighton Flux Dynamo theory: the polar field at the end of a cycle serves as a seed for the next cycle's growth. Near solar minimum this field usually bathes the Earth, and thereby affects geomagnetic indices then. We found support by examining 8 previous solar cycles. Using our solar precursor technique we successfully predicted cycles 21, 22 and 23 using WSO and MWSO data. Pesnell and I improved the method using a SODA (SOlar Dynamo Amplitude) Index. In 2005, nearing cycle 23's minimum, Svalgaard and I noted an unusually weak polar field, and forecasted a small cycle 24. We discuss future advances: the flux-dynamo methods. As far as future solar activity, I shall let the Sun decide; it will do so anyhow.

Schatten, Kenneth H.

2009-05-01

241

The theory of shell-based Q-mappings in geometric function theory  

SciTech Connect

Open, discrete Q-mappings in R{sup n}, n{>=}2, Q element of L{sup 1}{sub loc}, are proved to be absolutely continuous on lines, to belong to the Sobolev class W{sub loc}{sup 1,1}, to be differentiable almost everywhere and to have the N{sup -1}-property (converse to the Luzin N-property). It is shown that a family of open, discrete shell-based Q-mappings leaving out a subset of positive capacity is normal, provided that either Q has finite mean oscillation at each point or Q has only logarithmic singularities of order at most n-1. Under the same assumptions on Q it is proved that an isolated singularity x{sub 0} element of D of an open discrete shell-based Q-map f:D/{l_brace}x{sub 0{r_brace}{yields}}R-bar{sup n} is removable; moreover, the extended map is open and discrete. On the basis of these results analogues of the well-known Liouville, Sokhotskii-Weierstrass and Picard theorems are obtained. Bibliography: 34 titles.

Salimov, Ruslan R; Sevost'yanov, Evgenii A [Institute of Applied Mathematics and Mechanics, Ukraine National Academy of Sciences, Donetsk (Ukraine)

2010-08-12

242

Study on Enterprise's Life Cycle Based on Fuzzy Set Theory  

Microsoft Academic Search

There are many methods to judge enterprise's life cycle. This paper unifies the related method of fuzzy mathematics, and carries on the new division method of enterprise's life cycle. First, this paper bases on flexibility and controllability, and takes fuzzy mathematics as study tool. Through analyzing subordination functions and their mathematical expressions of P, A, E, I four factors, it

Liang Hong-song; Shi Chun-sheng

2006-01-01

243

Content Based Image Retrieval and Information Theory: A General Approach.  

ERIC Educational Resources Information Center

|Proposes an alternative real valued representation of color based on the information theoretic concept of entropy. A theoretical presentation of image entropy is accompanied by a practical description of the merits and limitations of image entropy compared to color histograms. Results suggest that image entropy is a promising approach to image…

Zachary, John; Iyengar, S. S.; Barhen, Jacob

2001-01-01

244

Dislocation theory based constitutive modelling: foundations and applications  

Microsoft Academic Search

This paper deals with a unified elastic–viscoplastic constitutive model based on dislocation density considerations. A combination of a kinetic equation, which describes the mechanical response of a material at a given microstructure in terms of dislocation glide, and evolution equations for internal variables characterising the microstructure provide the constitutive equations of the model. The internal variables are associated with the

Y. Estrin

1998-01-01

245

A Conceptual Framework Based on Activity Theory for Mobile CSCL  

ERIC Educational Resources Information Center

|There is a need for collaborative group activities that promote student social interaction in the classroom. Handheld computers interconnected by a wireless network allow people who work on a common task to interact face to face while maintaining the mediation afforded by a technology-based system. Wirelessly interconnected handhelds open up new…

Zurita, Gustavo; Nussbaum, Miguel

2007-01-01

246

A Composition Curriculum Based on James Britton's Theories.  

ERIC Educational Resources Information Center

In 1979, the Yonkers Public School district (New York) launched a project to design and implement secondary school language arts curriculum guides with an emphasis on written composition. A theoretical framework was developed, based on the work of James Britton and the philosophy of the Bay Area Writing Project (BAWP). Britton's work provided the…

Monahan, Brian D.; Zelner, Jane

247

Exploring the Theory and Paradigm Base for Wraparound  

Microsoft Academic Search

Until recently, family-centered policy and practice used expert models which defined families of children with serious emotional disturbance as dysfunctional A collaborative model, called wraparound, is emerging which engages these families as decision making participants, using naturally occurring strengths to wrap individualized supports around the child and family. However, because wraparound has been defined only through value-based principles, the fidelity

Rosalyn Malysiak

1997-01-01

248

Trust Calculation Model Based on Social Network and Evidence Theory  

Microsoft Academic Search

To solve the trust issue caused by malicious users in e-commerce, we propose a trust calculation model based on social network. Through analysing the trust features, social network is introduced into this trust model to get information from the most trusted source according to the subjectivity and the compositionality feature of trust to improve the buyers' situation of asymmetric information

Jie Jiang; Junhui Xiang; Hua Zhou; Xiaolin Zheng; Tianyang Dong

2011-01-01

249

A web exercise in evidence-based medicine using cognitive theory.  

PubMed

Our aim was to improve clinical reasoning skills by applying an established theory of memory, cognition, and decision making (fuzzy-trace theory) to instruction in evidence-based medicine. Decision-making tasks concerning chest pain evaluation in women were developed for medical students and internal medicine residents. The fuzzy-trace theory guided the selection of online sources (e.g., target articles) and decision-making tasks. Twelve students and 22 internal medicine residents attended didactic conferences emphasizing search, evaluation, and clinical application of relevant evidence. A 17-item Likert scale questionnaire assessed participants' evaluation of the instruction. Ratings for each of the 17 items differed significantly from chance in favor of this alternative approach to instruction. We concluded that fuzzy-trace theory may be a useful guide for developing learning exercises in evidence-based medicine. PMID:11251760

Lloyd, F J; Reyna, V F

2001-02-01

250

Electronic properties and stability of graphene nanoribbons: An interpretation based on Clar sextet theory  

NASA Astrophysics Data System (ADS)

The electronic structure and the stability of hydrogen-terminated graphene nanoribbons (GNRs) are evaluated by means of gradient-corrected density functional theory calculations and rationalized by application of Clar's theory of the aromatic sextet. Our results show that the electronic properties of GNRs are deeply related to the description of the bonding pattern provided from the valence bond picture obtained by application of Clar's theory. This finding applies either to zigzag-, armchair- and chiral-terminated GNRs and can be expected to have strong impact in the interpretation of experiments and on the design of devices based on nanostructured graphene materials.

Baldoni, Matteo; Sgamellotti, Antonio; Mercuri, Francesco

2008-10-01

251

Multiple object image segmentation algorithm based on wavelet theory  

NASA Astrophysics Data System (ADS)

The colony characteristics are used for evaluating the quality of water and food. Auto-detecting colony in an image is a hard task. This paper proposes a new multi-scale segmentation technique based on wavelet decompositions and watersheds. Firstly, we dispose the tiny colonies by using a wavelet domain median filter. Secondly, wavelet transform is used to create multi-resolution images. Then watershed segmentation algorithm is applied to segment the lowestresolution image and obtain the initial watershed segmentation result. Finally, we do segmentation on the high-resolution image based on the low-resolution image. Experiments results show that the colony images can be well segmented by using the new algorithm.

Wang, W.; Wang, Z.

2009-06-01

252

Microscopic theory of anomalous diffusion based on particle interactions  

NASA Astrophysics Data System (ADS)

We present a master equation formulation based on a Markovian random walk model that exhibits subdiffusion, classical diffusion, and superdiffusion as a function of a single parameter. The nonclassical diffusive behavior is generated by allowing for interactions between a population of walkers. At the macroscopic level, this gives rise to a nonlinear Fokker-Planck equation. The diffusive behavior is reflected not only in the mean squared displacement [˜t? with 0based on the master equation are shown to be in agreement with the analytical solutions of the nonlinear Fokker-Planck equation in all three diffusion regimes.

Lutsko, James F.; Boon, Jean Pierre

2013-08-01

253

Exploring acceptance of technology-based service innovations: A perspective of social learning theory  

Microsoft Academic Search

There were few studies focused on the acceptance of service innovations. A technology-based service innovation is usually more complicated, thus learning of this innovation is essentially required. We use the case of evidence-based medicine (EBM) realization, one kind of technology-based service innovations, to explore the acceptance of service innovations based on social learning theory. A total of 18 in-depth interviews

Wen-Hong Chiu; Huan-Neng Chiu; James K. C. Chen; Hui-Ru Chi; Frank Li-Sheng Chu

2010-01-01

254

Study of objective intelligent recognition based on ANN+DS evidence theory  

Microsoft Academic Search

The methods of the objector intelligent recognition based on artificial neural networks (ANN) + Dempster-Shafter (D-S) evidence combination theory has been studied in this article. The intelligent recognition tactics has been set forth, and the method and procedure of multisensor data fusion intelligent recognition on account of calculating case has been presented; Because D-S evidence combination theory is another important

QU Dong-Cai; Zhou Sheng-Ming; Shi Xian-Jun; Tang Da-Quan

2004-01-01

255

The Effect Of The Materials Based On Multiple Intelligence Theory Upon The Intelligence Groups' Learning Process  

NASA Astrophysics Data System (ADS)

The aim of this study is to find out the effect of the course materials based on Multiple Intelligence Theory upon the intelligence groups' learning process. In conclusion, the results proved that the materials prepared according to Multiple Intelligence Theory have a considerable effect on the students' learning process. This effect was particularly seen on the student groups of the musical-rhythmic, verbal-linguistic, interpersonal-social and naturalist intelligence.

Oral, I.; Dogan, O.

2007-04-01

256

Multi-attribute Decision-Making Model Based on Grey Game Theory with Mixed Strategy  

Microsoft Academic Search

As for the multi-attribute decision-making problem, most common methods used based on AHP are imprecise and complicated for taking weights of indices into account. The paper introduces game theory avoiding the discussion of weights which are inevitable in the normal decision-making model like AHP, DEA, and ANP, FUZZY and so on. Then it combines grey theory to establish a grey

Chen Wang; Jun Chen

2009-01-01

257

The diagnosis of tool wear based on RBF neural networks and DS evidence theory  

Microsoft Academic Search

In view of uncertain factors in the machining process, the paper puts forward a two-level information fusion method based on RBF neural network and D-S evidence theory. Three different signals were used to train and test three RBF neural networks and the outputs of three RBF networks were aggregated using the D-S evidence theory. Experiments show that the combination of

Weiqing Cao; Pan Fu; Weilin Li

2010-01-01

258

Method for PE Pipes Fusion Jointing Based on TRIZ Contradictions Theory  

NASA Astrophysics Data System (ADS)

The core of the TRIZ theories is the contradiction detection and solution. TRIZ provided various methods for the contradiction solution, but all that is not systematized. Combined with the technique system conception, this paper summarizes an integration solution method for contradiction solution based on the TRIZ contradiction theory. According to the method, a flowchart of integration solution method for contradiction is given. As a casestudy, method of fusion jointing PE pipe is analysised.

Sun, Jianguang; Tan, Runhua; Gao, Jinyong; Wei, Zihui

259

Theory of magnetic excitations in iron-based layered superconductors  

Microsoft Academic Search

Based on the effective four-band model we analyze the spin response in the normal and superconducting states of the Fe-pnictide superconductors. While the normal-state spin excitations are dominated by the continuum of the interorbital antiferromagnetic fluctuations and the intraband spin-density wave fluctuations, the unconventional superconductivity yields different feedback. The resonance peak in the form of the well-defined spin exciton occurs

M. M. Korshunov; I. Eremin

2008-01-01

260

A Compositional Semantic Theory for Synchronous Component-based Design  

Microsoft Academic Search

Digital signal processing and control (DSPC) tools allow ap- plication developers to assemble systems by connecting predened com- ponents in signal{o w graphs and by hierarchically building new com- ponents via encapsulating sub{graphs. Run{time environments then dy- namically schedule components for execution on some embedded proces- sor, typically in a synchronous cycle{based fashion, and check whether one component jams another

Barry Norton; Gerald Lüttgen; Michael Mendler

2003-01-01

261

Study on thermal wave based on the thermal mass theory  

Microsoft Academic Search

The conservation equations for heat conduction are established based on the concept of thermal mass. We obtain a general heat\\u000a conduction law which takes into account the spatial and temporal inertia of thermal mass. The general law introduces a damped\\u000a thermal wave equation. It reduces to the well-known CV model when the spatial inertia of heat flux and temperature and

RuiFeng Hu; BingYang Cao

2009-01-01

262

Turbine Fault Diagnosis Based on Fuzzy Theory and SVM  

Microsoft Academic Search

\\u000a A method based on fuzzy and support vector machine (SVM) is proposed to focus on the lack of samples in fault diagnosis of\\u000a turbine. Typical fault symptoms firstly are normalized by the membership functions perceptively. Then some samples are used\\u000a to train SVM of fault diagnosis. With the trained SVM, the correct fault type can be recognized. In the application

Fei Xia; Hao Zhang; Daogang Peng; Hui Li; Yikang Su

2009-01-01

263

Can Leadership Be Developed by Applying Leadership Theories? : An Examination of Three Theory-based Approaches to Leadership Development  

Microsoft Academic Search

Investigates the possibility of leadership development by application of leadership theory. Through a critical literature review, examines empirical studies utilizing three development approaches: Fiedler's Contingency Model, Burns and Bass's Transformational Leadership Theory, and Avolio's Authentic Leadership Theory. Concludes that, while leadership can be generated employing any of these theories, an overall framework for developing leadership is lacking. Presents a possible

Joshua C. Laguerre

2010-01-01

264

Boundary based on exchange symmetry theory for multilevel simulations. I. Basic theory.  

PubMed

In this paper, we lay the foundations for a new method that allows multilevel simulations of a diffusive system, i.e., a system where a flux of particles through the boundaries might disrupt the primary region. The method is based on the use of flexible restraints that maintain the separation between inner and outer particles. It is shown that, by introducing a bias potential that accounts for the exchange symmetry of the system, the correct statistical distribution is preserved. Using a toy model consisting of non-interacting particles in an asymmetric potential well, we prove that the method is formally exact, and that it could be simplified by considering only up to a couple of particle exchanges without a loss of accuracy. A real-world test is then made by considering a hybrid MM(?)/MM calculation of cesium ion in water. In this case, the single exchange approximation is sound enough that the results superimpose to the exact solutions. Potential applications of this method to many different hybrid QM/MM systems are discussed, as well as its limitations and strengths in comparison to existing approaches. PMID:23901973

Shiga, Motoyuki; Masia, Marco

2013-07-28

265

Boundary based on exchange symmetry theory for multilevel simulations. I. Basic theory  

NASA Astrophysics Data System (ADS)

In this paper, we lay the foundations for a new method that allows multilevel simulations of a diffusive system, i.e., a system where a flux of particles through the boundaries might disrupt the primary region. The method is based on the use of flexible restraints that maintain the separation between inner and outer particles. It is shown that, by introducing a bias potential that accounts for the exchange symmetry of the system, the correct statistical distribution is preserved. Using a toy model consisting of non-interacting particles in an asymmetric potential well, we prove that the method is formally exact, and that it could be simplified by considering only up to a couple of particle exchanges without a loss of accuracy. A real-world test is then made by considering a hybrid MM*/MM calculation of cesium ion in water. In this case, the single exchange approximation is sound enough that the results superimpose to the exact solutions. Potential applications of this method to many different hybrid QM/MM systems are discussed, as well as its limitations and strengths in comparison to existing approaches.

Shiga, Motoyuki; Masia, Marco

2013-07-01

266

A simple agent-based social impact theory model of student STEM selection  

Microsoft Academic Search

There is a growing body of knowledge describing the economic and social challenge faced by the United States because of the small (14%) and decreasing number of students pursuing Science, Technology, Engineering, and Mathematics (STEM) majors. We propose a simple two-period, agent-based simulation based on social impact theory to predict the % yield of STEM majors. The model indicates that

Theodore T. Allen; Nixon Davis

2010-01-01

267

A Comparison of Measurement Equivalence Methods Based on Confirmatory Factor Analysis and Item Response Theory.  

ERIC Educational Resources Information Center

|Current interest in the assessment of measurement equivalence emphasizes two methods of analysis, linear, and nonlinear procedures. This study simulated data using the graded response model to examine the performance of linear (confirmatory factor analysis or CFA) and nonlinear (item-response-theory-based differential item function or IRT-Based

Flowers, Claudia P.; Raju, Nambury S.; Oshima, T. C.

268

Web-Based Conferencing: Linking Theory, Educational Constructs, and Instructional Strategies  

Microsoft Academic Search

This chapter will present a description of links between educational constructs and corresponding principles of learning based on theory in a Web-based Computer Conferencing (WCC) environment. The Connecting these concepts highlights specific instructional strategies and applicable ideas for implementation of Web courses using conferencing. We suggest an organizational scheme that illustrates some relevant instructional strategies and aligns them with course

Brenda Bannan-Ritland; William Bragg; Mauri Collins

269

Barriers to disseminating off-the-shelf based development theories to IT industry  

Microsoft Academic Search

In this position paper, we have reported results of an industrial seminar. The seminar was intended to show our findings in an international survey, conducted in Norway, Italy and Germany, on off-the-shelf component-based development. Discussion in the second section of the seminar revealed several obstacles of popularizing the OTS based development theories into IT industry.

Jingyue Li; Reidar Conradi; Odd Petter N. Slyngstad; Christian Bunse; Umair Khan; Maurizio Morisio; Marco Torchiano

2005-01-01

270

Negative index of refraction microwave frequency structures based on high permittivity inclusions and effective medium theory  

Microsoft Academic Search

A metamaterial designed to have simultaneous negative permittivity and permeability may be built from a cubic lattice of spheres and a three dimensional wire grid embedded in a host medium. Based on reported theory, the spheres must have higher permittivity than the surrounding medium and be smaller than the wavelength of the electromagnetic radiation in the host medium. Metamaterials based

James M. L. Cramer; Andrew J. Gatesman; Robert H. Giles; William E. Nixon

2008-01-01

271

Evaluating the Evidence Base for Relational Frame Theory: A Citation Analysis  

ERIC Educational Resources Information Center

|Relational frame theory (RFT) is a contemporary behavior-analytic account of language and cognition. Since it was first outlined in 1985, RFT has generated considerable controversy and debate, and several claims have been made concerning its evidence base. The present study sought to evaluate the evidence base for RFT by undertaking a citation…

Dymond, Simon; May, Richard J.; Munnelly, Anita; Hoon, Alice E.

2010-01-01

272

Strategies for Integrating Computer-Based Training in College Music Theory Courses.  

ERIC Educational Resources Information Center

During the fall semester of 1993, a curriculum-based computer-based training (CBT) program was used to replace all in-class drills in intervals and chord identification for one section of freshman music theory at the University of Northern Colorado. This study was conducted to determine whether aural skills can be taught as effectively through the…

Hess, George J., Jr.

273

Using Game Theory and Competition-Based Learning to Stimulate Student Motivation and Performance  

ERIC Educational Resources Information Center

This paper introduces a framework for using Game Theory tournaments as a base to implement Competition-based Learning (CnBL), together with other classical learning techniques, to motivate the students and increase their learning performance. The paper also presents a description of the learning activities performed along the past ten years of a…

Burguillo, Juan C.

2010-01-01

274

Using Game Theory and Competition-Based Learning to Stimulate Student Motivation and Performance  

ERIC Educational Resources Information Center

|This paper introduces a framework for using Game Theory tournaments as a base to implement Competition-based Learning (CnBL), together with other classical learning techniques, to motivate the students and increase their learning performance. The paper also presents a description of the learning activities performed along the past ten years of a…

Burguillo, Juan C.

2010-01-01

275

Feature Selection Based on Information Theory for Speaker Verification  

NASA Astrophysics Data System (ADS)

Feature extraction/selection is an important stage in every speaker recognition system. Dimension reduction plays a mayor roll due to not only the curse of dimensionality or computation time, but also because of the discriminative relevancy of each feature. The use of automatic methods able to reduce the dimension of the feature space without losing performance is one important problem nowadays. In this sense, a method based on mutual information is studied in order to keep as much discriminative information as possible and the less amount of redundant information. The system performance as a function of the number of retained features is studied.

Fernández, Rafael; Bonastre, Jean-François; Matrouf, Driss; Calvo, José R.

276

Mindfulness-based cognitive therapy: theory and practice.  

PubMed

Mindfulness-based cognitive therapy (MBCT) incorporates elements of cognitive-behavioural therapy with mindfulness-based stress reduction into an 8-session group program. Initially conceived as an intervention for relapse prevention in people with recurrent depression, it has since been applied to various psychiatric conditions. Our paper aims to briefly describe MBCT and its putative mechanisms of action, and to review the current findings about the use of MBCT in people with mood and anxiety disorders. The therapeutic stance of MBCT focuses on encouraging patients to adopt a new way of being and relating to their thoughts and feelings, while placing little emphasis on altering or challenging specific cognitions. Preliminary functional neuroimaging studies are consistent with an account of mindfulness improving emotional regulation by enhancing cortical regulation of limbic circuits and attentional control. Research findings from several randomized controlled trials suggest that MBCT is a useful intervention for relapse prevention in patients with recurrent depression, with efficacy that may be similar to maintenance antidepressants. Preliminary studies indicate MBCT also shows promise in the treatment of active depression, including treatment-resistant depression. Pilot studies have also evaluated MBCT in bipolar disorder and anxiety disorders. Patient and clinician resources for further information on mindfulness and MBCT are provided. PMID:22340145

Sipe, Walter E B; Eisendrath, Stuart J

2012-02-01

277

Theory, Theory  

NSDL National Science Digital Library

This lesson includes a theory-evaluation activity. A set of five scenarios (theories for how diverse life came into existence on Earth) is divided evenly throughout the class, so each student is asked to evaluate one theory. Students then come together in groups of five, so that all theories are represented in each group, where they are compared and evaluated. Each group reports to the entire class for further discussion and clarifications.

Kimmel, Michael

2007-12-12

278

Derivative Trade Optimizing Model Utilizing GP Based on Behavioral Finance Theory  

NASA Astrophysics Data System (ADS)

This paper proposed a new technique which makes the strategy trees for the derivative (option) trading investment decision based on the behavioral finance theory and optimizes it using evolutionary computation, in order to achieve high profitability. The strategy tree uses a technical analysis based on a statistical, experienced technique for the investment decision. The trading model is represented by various technical indexes, and the strategy tree is optimized by the genetic programming(GP) which is one of the evolutionary computations. Moreover, this paper proposed a method using the prospect theory based on the behavioral finance theory to set psychological bias for profit and deficit and attempted to select the appropriate strike price of option for the higher investment efficiency. As a result, this technique produced a good result and found the effectiveness of this trading model by the optimized dealings strategy.

Matsumura, Koki; Kawamoto, Masaru

279

Rebutting the suggestion that Anthony Giddens's Structuration Theory offers a useful framework for sociological nursing research: a critique based upon Margaret Archer's Realist Social Theory  

Microsoft Academic Search

A recent paper in this journal by Hardcastle et al . in 2005 argued that Anthony Giddens's Structuration Theory (ST) might usefully inform sociological nursing research. In response, a critique of ST based upon the Realist Social Theory of Margaret Archer is presented. Archer maintains that ST is fatally flawed and, in consequence, it has little to offer nursing research.

Martin Lipscomb

2006-01-01

280

Microfluidic, Bead-Based Assay: Theory and Experiments  

PubMed Central

Microbeads are frequently used as a solid support for biomolecules such as proteins and nucleic acids in heterogeneous microfluidic assays. However, relatively few studies investigate the binding kinetics on modified bead surfaces in a microfluidics context. In this study, a customized hot embossing technique is used to stamp microwells in a thin plastic substrate where streptavidin-coated agarose beads are selectively placed and subsequently immobilized within a conduit. Biotinylated quantum dots are used as a label to monitor target analyte binding to the bead's surface. Three-dimensional finite element simulations are carried out to model the binding kinetics on the bead's surface. The model accounts for surface exclusion effects resulting from a single quantum dot occluding multiple receptor sites. The theoretical predictions are compared and favorably agree with experimental observations. The theoretical simulations provide a useful tool to predict how varying parameters affect microbead reaction kinetics and sensor performance. This study enhances our understanding of bead-based microfluidic assays and provides a design tool for developers of point-of-care, lab-on-chip devices for medical diagnosis, food and water quality inspection, and environmental monitoring.

Thompson, Jason A.; Bau, Haim H.

2009-01-01

281

Theory of normal and superconducting properties of fullerene-based solids  

SciTech Connect

Recent experiments on the normal-state and superconducting properties of fullerene-based solids are used to constrain the proposal theories of the electronic nature of these materials. In general, models of superconductivity based on electron pairing induced by phonons are consistent with electronic band theory. The latter experiments also yield estimates of the parameters characterizing these type H superconductors. It is argued that, at this point, a standard model'' of phonons interacting with itinerant electrons may be a good first approximation for explaining the properties of the metallic fullerenes.

Cohen, M.L.

1992-10-01

282

Theory of normal and superconducting properties of fullerene-based solids  

SciTech Connect

Recent experiments on the normal-state and superconducting properties of fullerene-based solids are used to constrain the proposal theories of the electronic nature of these materials. In general, models of superconductivity based on electron pairing induced by phonons are consistent with electronic band theory. The latter experiments also yield estimates of the parameters characterizing these type H superconductors. It is argued that, at this point, a ``standard model`` of phonons interacting with itinerant electrons may be a good first approximation for explaining the properties of the metallic fullerenes.

Cohen, M.L.

1992-10-01

283

Energy-Efficiency Analysis of a Distributed Queuing Medium Access Control Protocol for Biomedical Wireless Sensor Networks in Saturation Conditions  

PubMed Central

The aging population and the high quality of life expectations in our society lead to the need of more efficient and affordable healthcare solutions. For this reason, this paper aims for the optimization of Medium Access Control (MAC) protocols for biomedical wireless sensor networks or wireless Body Sensor Networks (BSNs). The hereby presented schemes always have in mind the efficient management of channel resources and the overall minimization of sensors’ energy consumption in order to prolong sensors’ battery life. The fact that the IEEE 802.15.4 MAC does not fully satisfy BSN requirements highlights the need for the design of new scalable MAC solutions, which guarantee low-power consumption to the maximum number of body sensors in high density areas (i.e., in saturation conditions). In order to emphasize IEEE 802.15.4 MAC limitations, this article presents a detailed overview of this de facto standard for Wireless Sensor Networks (WSNs), which serves as a link for the introduction and initial description of our here proposed Distributed Queuing (DQ) MAC protocol for BSN scenarios. Within this framework, an extensive DQ MAC energy-consumption analysis in saturation conditions is presented to be able to evaluate its performance in relation to IEEE 802.5.4 MAC in highly dense BSNs. The obtained results show that the proposed scheme outperforms IEEE 802.15.4 MAC in average energy consumption per information bit, thus providing a better overall performance that scales appropriately to BSNs under high traffic conditions. These benefits are obtained by eliminating back-off periods and collisions in data packet transmissions, while minimizing the control overhead.

Otal, Begonya; Alonso, Luis; Verikoukis, Christos

2011-01-01

284

Energy-efficiency analysis of a distributed queuing medium access control protocol for biomedical wireless sensor networks in saturation conditions.  

PubMed

The aging population and the high quality of life expectations in our society lead to the need of more efficient and affordable healthcare solutions. For this reason, this paper aims for the optimization of Medium Access Control (MAC) protocols for biomedical wireless sensor networks or wireless Body Sensor Networks (BSNs). The hereby presented schemes always have in mind the efficient management of channel resources and the overall minimization of sensors' energy consumption in order to prolong sensors' battery life. The fact that the IEEE 802.15.4 MAC does not fully satisfy BSN requirements highlights the need for the design of new scalable MAC solutions, which guarantee low-power consumption to the maximum number of body sensors in high density areas (i.e., in saturation conditions). In order to emphasize IEEE 802.15.4 MAC limitations, this article presents a detailed overview of this de facto standard for Wireless Sensor Networks (WSNs), which serves as a link for the introduction and initial description of our here proposed Distributed Queuing (DQ) MAC protocol for BSN scenarios. Within this framework, an extensive DQ MAC energy-consumption analysis in saturation conditions is presented to be able to evaluate its performance in relation to IEEE 802.5.4 MAC in highly dense BSNs. The obtained results show that the proposed scheme outperforms IEEE 802.15.4 MAC in average energy consumption per information bit, thus providing a better overall performance that scales appropriately to BSNs under high traffic conditions. These benefits are obtained by eliminating back-off periods and collisions in data packet transmissions, while minimizing the control overhead. PMID:22319351

Otal, Begonya; Alonso, Luis; Verikoukis, Christos

2011-01-25

285

A Theory-based Approach to the Measurement of Foreign Language Learning Ability: The CANAL-F Theory and Test.  

ERIC Educational Resources Information Center

Presents a rationale, description, and partial construct validation of a new theory of foreign language aptitude: CANAL-F--Cognitive Ability for Novelty in Acquisition of Language (foreign). The theory was applied and implemented in a test of foreign language aptitude (CANAL-FT). Outlines the CANAL-F theory and details of its instrumentation…

Grigorenko, Elena L.; Sternberg, Robert J.; Ehrman, Madeline E.

2000-01-01

286

The Scientific Value of Cognitive Load Theory: A Research Agenda Based on the Structuralist View of Theories  

ERIC Educational Resources Information Center

|In this paper, two methodological perspectives are used to elaborate on the value of cognitive load theory (CLT) as a scientific theory. According to the more traditional critical rationalism of Karl Popper, CLT cannot be considered a scientific theory because some of its fundamental assumptions cannot be tested empirically and are thus not…

Gerjets, Peter; Scheiter, Katharina; Cierniak, Gabriele

2009-01-01

287

A Theory-based Approach to the Measurement of Foreign Language Learning Ability: The CANAL-F Theory and Test.  

ERIC Educational Resources Information Center

|Presents a rationale, description, and partial construct validation of a new theory of foreign language aptitude: CANAL-F--Cognitive Ability for Novelty in Acquisition of Language (foreign). The theory was applied and implemented in a test of foreign language aptitude (CANAL-FT). Outlines the CANAL-F theory and details of its instrumentation…

Grigorenko, Elena L.; Sternberg, Robert J.; Ehrman, Madeline E.

2000-01-01

288

From a Routine-Based to a Knowledge-Based View: Towards an Evolutionary Theory of the Firm  

Microsoft Academic Search

Evolutionary economics in the initial version of Nelson and Winter is concentrated on the analysis of the evolution of industries and markets and in that entrepreneurial innovation activities. But a theory of the firm beneath the level of the industry is not taken into account to a large extent. In order to widen its fundamental principles a resource-based, and as

Fritz Rahmeyer

2006-01-01

289

An anisotropic constitutive equation for the stress tensor of blood based on mixture theory  

SciTech Connect

Based on ideas proposed by Massoudi and Rajagopal (M-R), we develop a model for blood using the theory of interacting continua, that is, the mixture theory. We first provide a brief review of mixture theory, and then discuss certain issues in constitutive modeling of a two-component mixture. In the present formulation, we ignore the biochemistry of blood and assume that blood is composed of red blood cells (RBCs) suspended in plasma, where the plasma behaves as a linearly viscous fluid and the RBCs are modeled as an anisotropic nonlinear density-gradient-type fluid. We obtain a constitutive relation for blood, based on the simplified constitutive relations derived for plasma and RBCs. A simple shear flow is discussed, and an exact solution is obtained for a very special case; for more general cases, it is necessary to solve the nonlinear coupled equations numerically.

Massoudi, Mehrdad; Antaki, J.F.

2008-09-12

290

An anisotropic constitutive equation for the stress tensor of blood based on mixture theory  

SciTech Connect

Based on ideas proposed by Massoudi and Rajagopal #2;M-R#3;, we develop a model for blood using the theory of interacting continua, that is, the mixture theory. We first provide a brief review of mixture theory, and then discuss certain issues in constitutive modeling of a two-component mixture. In the present formulation, we ignore the biochemistry of blood and assume that blood is composed of red blood cells #2;RBCs#3; suspended in plasma, where the plasma behaves as a linearly viscous fluid and the RBCs are modeled as an anisotropic nonlinear density-gradient-type fluid. We obtain a constitutive relation for blood, based on the simplified constitutive relations derived for plasma and RBCs. A simple shear flow is discussed, and an exact solution is obtained for a very special case; for more general cases, it is necessary to solve the nonlinear coupled equations numerically.

Massoudi, M.; Antaki, J.

2008-01-01

291

Building the branding and attractive small town based on the CI theory—Take the longmen ancient town for example  

Microsoft Academic Search

The feasibility of importing the CI theory into the attractive small town was discussed. The ancient Longmen town was selected as the study object to design some specific importing program based on the field work and questionnaires, and extend the new carriers for the application of the CI theory, and support the building of attractive small town with the theory

Shuanghua Liu; Ye Liu; Song Li

2011-01-01

292

Fracture of bicrystal metal\\/ceramic interfaces: A study via the mechanism-based strain gradient crystal plasticity theory  

Microsoft Academic Search

Two continuum mechanical models of crystal plasticity theory namely, conventional crystal plasticity theory and mechanism-based crystal plasticity theory, are used to perform a comparative study of stresses that are reached at and ahead of the crack tip of a bicrystal niobium\\/alumina specimen. Finite element analyses are done for a stationary crack tip and growing cracks using a cohesive modelling approach.

A. Siddiq; S. Schmauder; Y. Huang

2007-01-01

293

Theory-based predictors of multiple clinician behaviors in the management of diabetes.  

PubMed

Behavioral theory is often tested on one behavior in isolation from other behaviors and theories. We aimed to test the predictive validity of constructs from motivation and action theories of behavior across six diabetes-related clinician behaviors, within the same sample of primary care clinicians. Physicians and nurses (n = 427 from 99 practices in the United Kingdom) completed questionnaires at baseline and 12 months. Primary outcomes: six self-reported clinician behaviors related to advising, prescribing and examining measured at 12 months; secondary outcomes: baseline intention and patient-scenario-based simulated behavior. Across six behaviors, each theory accounted for a medium amount of variance for 12-month behavior (median R adj (2)  = 0.15), large and medium amount of variance for two intention measures (median R adj (2)  = 0.66; 0.34), and small amount of variance for simulated behavior (median R adj (2)  = 0.05). Intention/proximal goals, self-efficacy, and habit predicted all behaviors. Constructs from social cognitive theory (self-efficacy), learning theory (habit) and action and coping planning consistently predicted multiple clinician behaviors and should be targeted by quality improvement interventions. PMID:23670643

Presseau, Justin; Johnston, Marie; Francis, Jill J; Hrisos, Susan; Stamp, Elaine; Steen, Nick; Hawthorne, Gillian; Grimshaw, Jeremy M; Elovainio, Marko; Hunter, Margaret; Eccles, Martin P

2013-05-14

294

Mixture theory-based poroelasticity as a model of interstitial tissue growth  

PubMed Central

This contribution presents an alternative approach to mixture theory-based poroelasticity by transferring some poroelastic concepts developed by Maurice Biot to mixture theory. These concepts are a larger RVE and the subRVE-RVE velocity average tensor, which Biot called the micro-macro velocity average tensor. This velocity average tensor is assumed here to depend upon the pore structure fabric. The formulation of mixture theory presented is directed toward the modeling of interstitial growth, that is to say changing mass and changing density of an organism. Traditional mixture theory considers constituents to be open systems, but the entire mixture is a closed system. In this development the mixture is also considered to be an open system as an alternative method of modeling growth. Growth is slow and accelerations are neglected in the applications. The velocity of a solid constituent is employed as the main reference velocity in preference to the mean velocity concept from the original formulation of mixture theory. The standard development of statements of the conservation principles and entropy inequality employed in mixture theory are modified to account for these kinematic changes and to allow for supplies of mass, momentum and energy to each constituent and to the mixture as a whole. The objective is to establish a basis for the development of constitutive equations for growth of tissues.

Cowin, Stephen C.; Cardoso, Luis

2011-01-01

295

An Empirical Study of Flexible Business Process Based on Modularity System Theory  

Microsoft Academic Search

This paper introduced concept of modularity business process. High modular business processes have properties of encapsulation and plug-and-play, which make business process more flexible and responsible to environment change. We also proposed a mechanism model of business process modularity and hypothesizes based on modular system theory and transaction cost economics. Diversity of customer demand and supplier specialization will lead to

Fang Ding; Liu Jie

2008-01-01

296

Local Realistic Theory for PDC Experiments Based on the Wigner Formalism  

Microsoft Academic Search

In this article we present a local hidden variables model for all experiments involving photon pairs produced in parametric down conversion, based on the Wigner representation of the radiation field. A modification of the standard quantum theory of detection is made in order to give a local realist explanation of the counting rates in photodetectors. This model involves the existence

Alberto Casado; Ramon Risco-Delgado; Emilio Santos

2001-01-01

297

Evaluating of TRB stamping process plans based on theory of fuzzy set barycenter  

Microsoft Academic Search

Generalizing tailor rolled blank applied in panels is one of efficient approach for automobile realizing lightweight, the stamping process plans based on general blank are affirmed even depending on experience, the uncertainty of plans decision making must greatly boost up if TRB will be applied in panels. Theory of fuzzy set barycenter was put forward to decision make plans in

Jitao Du; Yanhua Li; Hongbin Fei

2009-01-01

298

The impact of prospect theory based framing tactics on advertising effectiveness  

Microsoft Academic Search

Among the most important decisions managers make is the determination of the most effective advertising strategies (and their associated tactics) and the determination of the market segments for which each strategy will be effective. Little research has explored the application of prospect theory based framing tactics (described in the text) to advertising. In this research we empirically test three framing

Paul D Berger; Gerald E Smith

1998-01-01

299

Research on the failure character in the shock signal based on the EEMD theory  

Microsoft Academic Search

On the basis of the research on the shock signal, the composition and frequency characteristic of the signal are proposed. Through the field test of the engine gearbox, the acceleration signal is achieved and conducted with spectrum analysis to obtain the natural frequency. A method of transient signal analysis based on the EEMD theory of order domain was presented, through

Li Xiaofeng; Liu Mingjie

2010-01-01

300

Mathematical Theory of Attitude and Opinion Formation Based on High School Civics and History. Final Report.  

ERIC Educational Resources Information Center

|Four experiments designed to study attitudes toward United States Presidents are described. The project uses the conceptual framework and methodology of a mathematical theory of information integration to compile information on attitudes and opinion formation based on high school civics and history courses. Results of the research findings of…

Anderson, Norman H.

301

Critically Evaluating Competing Theories: An Exercise Based on the Kitty Genovese Murder  

ERIC Educational Resources Information Center

|We describe an exercise based on the 1964 murder of Catherine Genovese--a murder observed by 38 witnesses, none of whom called the police. Students read a summary of the murder and worked in small groups to design an experiment to test the competing theories for the inaction of the witnesses (Americans' selfishness and insensitivity vs. diffusion…

Sagarin, Brad J.; Lawler-Sagarin, Kimberly A.

2005-01-01

302

Creating and Capturing Value: Strategic Corporate Social Responsibility, Resource-Based Theory, and Sustainable Competitive Advantage  

Microsoft Academic Search

The authors analyze the creation and capture of private and social value by firms that adopt corporate social responsibility (CSR) strategies. Strategic CSR is defined as any “responsible” activity that allows a firm to achieve a sustainable competitive advantage, regardless of motive. To provide a roadmap for managers to accomplish this objective, the authors integrate the resource-based theory (RBT) framework

Abagail McWilliams; Donald S. Siegel

2011-01-01

303

Real-time estimation of transmission line impedance based on modal analysis theory  

Microsoft Academic Search

1 Abstract--The objective of this paper is to show a methodology to estimate the longitudinal parameters of transmission lines. The method is based on the modal analysis theory and developed from the currents and voltages measured at the sending and receiving ends of the line. Another proposal is to estimate the line impedance in function of the real-time load apparent

G. A. Asti; S. Kurokawa; E. C. M. Costa; J. Pissolato

2011-01-01

304

Transdiagnostic Theory and Application of Family-Based Treatment for Youth with Eating Disorders  

ERIC Educational Resources Information Center

This paper describes the transdiagnostic theory and application of family-based treatment (FBT) for children and adolescents with eating disorders. We review the fundamentals of FBT, a transdiagnostic theoretical model of FBT and the literature supporting its clinical application, adaptations across developmental stages and the diagnostic spectrum…

Loeb, Katharine L.; Lock, James; Greif, Rebecca; le Grange, Daniel

2012-01-01

305

Retinex theory-based shadow detection and removal in single outdoor image  

Microsoft Academic Search

Purpose – Shadows, the common phenomena in most outdoor scenes, bring many problems in practical image processing. Shadow detection and removal, especial in uncalibrated outdoor image, is still a difficult problem. The purpose of this paper is to detect and to remove shadows in single outdoor image based on retinex theory. Design\\/methodology\\/approach – The shadow extraction algorithm originates from a

Jing Sun; Jiandong Tian; Yingkui Du; Yandong Tang

2009-01-01

306

Research on edge detection method of infrared image based-on dynamic programming theory  

Microsoft Academic Search

In this paper, a dynamic programming (DP) method, concerning the edge detection of infrared (IR) target from a given field background, is proposed. It involves locally adaptive threshold technique and fractal theory. Firstly, optimal control function based on different fractal dimensions and gray level features on infrared image is created. The second step is to seek latent object point by

Xiaoke Yan; Caisheng Shi; Baojun Zhao; Peikun He

2004-01-01

307

Leadership with inner meaning: A contingency theory of leadership based on the worldviews of five religions  

Microsoft Academic Search

The purpose of this article is to create the foundation for a contingency theory of leadership based on the inner values and worldviews of five major religious traditions: Islam, Christianity, Judaism, Hinduism and Buddhism. The article identifies similarities and differences in the implicit leadership models among these five religious traditions. It further explores the implications of this model for organizational

Mark Kriger; Yvonne Seng

2005-01-01

308

A New Theory of Micturition and Urinary Continence Based on Histomorphological Studies  

Microsoft Academic Search

Theories of seminal emission and ejaculation based on morphology especially of the dorsal longitudinal urethral muscle system are found very infrequently in the literature. Our own examinations carried out on serial sections of the whole distal urethral complex taken from 50 male and 15 female autopsy preparations prove that the dorsal longitudinal urethral muscle system represents an independent smooth muscle.

W. Dorschner; J.-U. Stolzenburg

1994-01-01

309

Implications and Applications of Modern Test Theory in the Context of Outcomes Based Education.  

ERIC Educational Resources Information Center

Uses a framework previously developed to relate outcomes based education and B. Bloom's "Taxonomy of Educational Objectives" to consider ways in which modern test theory can be used to connect aspects of assessment to the curriculum framework and to consider insights this connection might provide. (SLD)

Andrich, David

2002-01-01

310

Using RSS to support mobile learning based on media richness theory  

Microsoft Academic Search

With the rapid development of mobile technologies, mobile learning has become a new trend in education. A better understanding of how to effectively use communication technologies to improve mobile learning is important. The purpose of this paper is to evaluate the media richness of various message delivery methods in the proposed m-learning environment based on media richness theory. Regarding the

Yu-Feng Lan; Yang-Siang Sie

2010-01-01

311

Interpretation-Based Processing: A Unified Theory of Semantic Sentence Comprehension  

ERIC Educational Resources Information Center

|We present interpretation-based processing--a theory of sentence processing that builds a syntactic and a semantic representation for a sentence and assigns an interpretation to the sentence as soon as possible. That interpretation can further participate in comprehension and in lexical processing and is vital for relating the sentence to the…

Budiu, Raluca; Anderson, John R.

2004-01-01

312

A Theory-based Faculty Development Program for Clinician-Educators.  

ERIC Educational Resources Information Center

|Describes development, implementation, and evaluation of a theory-based faculty development program for physician-educators in medicine and pediatrics at the Cleveland Clinic (Ohio). The program includes a 12-hour course focused on precepting skills, bedside teaching, and effective feedback; on-site coaching; and innovative projects in clinical…

Hewson, Mariana G.

2000-01-01

313

Design of optimum Nyquist signals based on generalized sampling theory for data communications  

Microsoft Academic Search

A new method is given for the optimal design of bandlimited Nyquist-type signal shapes for data communications, which maximizes its energy in a given time interval. The method is based on the periodically nonuniform sampling (PNS) theory making use of the linear splines. The computation is straightforward, and the constraint for intersymbol interference is shown to be easy to include

Erdal Panayirci; T. Ozugur; H. Caglar

1999-01-01

314

A network security assessment model based on attack-defense game theory  

Microsoft Academic Search

In this paper a network security assessment model based on game theory is presented to evaluate network security and perform active defense. The model uses the game relationship between attacker and defender to formally describe and quantitatively calculate benefits and costs of both sides. By solving mixed Nash equilibrium of the model, we could obtain the knowledge of possible attack

Baoyi Wang; Jianqiang Cai; Shaomin Zhang; Jun Li

2010-01-01

315

Toward a Theory for Scheduling Dags in Internet-Based Computing  

Microsoft Academic Search

Conceptual and algorithmic tools are developed as a foundation for a theory of scheduling complex computation-dags for Internet-based computing. The goal of the schedules produced is to render tasks eligible for allocation to remote clients (hence, for execution) at the maximum possible rate. This allows one to utilize remote clients well, as well as to lessen the likelihood of the

Grzegorz Malewicz; Arnold L. Rosenberg; Matthew Yurkewych

2006-01-01

316

A Practice-Based Theory of Professional Education: Teach For America's Professional Development Model  

ERIC Educational Resources Information Center

|In 1999, Ball and Cohen proposed a practice-based theory of professional education, which would end inadequate professional development efforts with a more comprehensive approach. Their work has been referenced over the past decade, yet there have been limited attempts to actualize their ideals and research their implications. In this article, I…

Gabriel, Rachael

2011-01-01

317

Applications of Cognitive Load Theory to Multimedia-Based Foreign Language Learning: An Overview  

ERIC Educational Resources Information Center

This article reviews the multimedia instructional design literature based on cognitive load theory (CLT) in the context of foreign language learning. Multimedia are of particular importance in language learning materials because they incorporate text, image, and sound, thus offering an integrated learning experience of the four language skills…

Chen, I-Jung; Chang, Chi-Cheng; Lee, Yen-Chang

2009-01-01

318

Media Reputation as a Strategic Resource: An Integration of Mass Communication and Resource-Based Theories  

Microsoft Academic Search

The resource-based view proposes that reputation is a resource leading to competitive advantage. Past research tested this by using Fortune ratings to measure reputation, but these ratings are theoretically weak. This paper integrates mass communication theory into past research to develop a concept called media reputation, defined as the overall evaluation of a firm presented in the media. Theoretical and

David L. Deephouse

2000-01-01

319

Media reputation as a strategic resource: an integration of mass communication and resource-based theories  

Microsoft Academic Search

The resource-based view proposes that reputation is a resource leading to competitive advantage. Past research tested this by using Fortune ratings to measure reputation, but these ratings are theoretically weak. This paper integrates mass communication theory into past research to develop a concept called media reputation, defined as the overall evaluation of a firm presented in the media. Theoretical and

David L. Deephouse

2000-01-01

320

English Textbooks Based on Research and Theory--A Possible Dream.  

ERIC Educational Resources Information Center

Research based text materials will probably never dominate the textbook market. To begin with, translating theory and research into practice is a chancy business. There are also creative problems such as the inherent oversimplification involved in textbook writing. Every textbook writer who has been a classroom teacher will acknowledge that such…

Suhor, Charles

1984-01-01

321

A practical method for the energy measurement of therapeutic electron beams based on Multiple Scattering Theory  

Microsoft Academic Search

Periodic energy measurements of therapeutic electron beams are critical for assuring patient safety. In this paper, a low cost and reliable method based on Multiple Scattering Theory and the use of a simple ionization chamber has been proposed. The energy is determined by measuring mass scattering power derived from the spatial distribution of a pencil beam in air, obtained from

A. Guvenis; Yekta Ulgen; F. Isbakan

1997-01-01

322

Statistical prefilter design for MIMO ZF and MMSE receivers based on majorization theory  

Microsoft Academic Search

Recently, the authors proposed statistical prefilters for MMSE and ZF receivers that minimize SER (Kiessling, M. et al., IEEE WCNC, 2003; IEEE VTC, 2003). We now give a general derivation of their structure based on majorization theory. For both receiver types, it is shown that the optimal prefilter essentially transmits on the strongest long-term eigenmodes of the channel with proper

Mario Kiessling; Joachim Speidel

2004-01-01

323

A New Transformer Model Based on Modified Multi-Conductor Transmission Line Theory  

Microsoft Academic Search

To calculate the very fast transient overvoltages in transformer windings, a model based on the modified multi-conductor transmission line (MTL) theory is proposed in this paper. In original MTL model, the lengths of all the conductors are considered to be equal and this approximation can cause inaccuracy. In fact, the lengths of the conductors are decreasing from the outside to

Guishu Liang; Xiaoyan Zhu; Huaying Dong

2009-01-01

324

Nuclear Forces and Few-Nucleon Studies Based on Chiral Perturbation Theory  

SciTech Connect

After a brief review on the status of few--nucleon studies based on conventional nuclear forces, we sketch the concepts of the effective field theory approach constrained by chiral symmetry and its application to nuclear forces. Then first results for few--nucleon observables are discussed.

W. Gloeckle; E. Epelbaum; U.G. Meissner; A. Nogga; H. Kamada; H. Witala

2003-11-01

325

A New Measure of Quality of Work Life (QWL) Based on Need Satisfaction and Spillover Theories  

Microsoft Academic Search

A new measure of QWL was developed based on need satisfaction and spillover theories. The measure was designed to capture the extent to which the work environment, job requirements, supervisory behavior, and ancillary programs in an organization are perceived to meet the needs of an employee. We identified seven major needs, each having several dimensions. These are: (a) health and

M. Joseph Sirgy; David Efraty; Phillip Siegel; Dong-Jin Lee

2001-01-01

326

Based on kalman filter theory multiple launch rocket ballistic parameters filtrating analyze  

Microsoft Academic Search

For the dynamics system of multiple launch rocket s, measuring error of ballistic parameters will appear under the influence of noise disturbance signals. The method of filtrating and estimating the ballistic parameters in the flight of multiple launch rocket is putted forward based on the theory of Kalman filter in this paper. And a filtrating example is also demonstrated in

Xin Wang; Yao Yao

2009-01-01

327

Sequence coding based on the fractal theory of iterated tranformations systems  

Microsoft Academic Search

A new scheme for sequence coding based on the iterated functions systems theory is presented. The method relies on a 3D approach in which the sequence is adaptively partitioned. Each partition block can be coded either by using the spatial self similarities or by exploiting temporal redundancies. The proposed system shows very good performances when compared to other existing methods.

Emmanuel Reusens

1993-01-01

328

THE KNOWLEDGE BASED VIEW REVISITED: KNOWLEDGE GOVERNANCE AND THE THEORY OF THE FIRM  

Microsoft Academic Search

This paper suggests a new synthesis of knowledge-based approaches to the theory of the firm. It employs a social-constructivist and contextual conceptualization of knowledge as residing in groups of practitioners, epistemic communities, arguing that the ease or diffi- culty of sharing knowledge is more dependent on the cognitive capabilities of the exchange partners than on the characteristics of the knowledge

Lars Håkanson

329

Kinetic theory based CFD simulation of turbulent fluidization of FCC particles in a riser  

Microsoft Academic Search

The turbulent fluidization regime is characterized by the co-existence of a dense, bottom region and a dilute, top bed. A kinetic theory based CFD code with a drag corrected for clusters captured the basic features of this flow regime: the dilute and dense regions, high dispersion coefficients and a strong anisotropy. The computed energy spectrum captures the observed gravity wave

Veeraya Jiradilok; Dimitri Gidaspow; Somsak Damronglerd; William J. Koves; Reza Mostofi

2006-01-01

330

Thermal theory based feature extraction method for high noise PET images  

Microsoft Academic Search

We propose an image feature extraction method based on the thermal theory for high noise PET images. The PET imaging, which records physiological activities of tissues, is broadly used to provide diagnostic information for investigating clinical disorders. To extract desired regions of interest (ROIs) from noisy PET images for clinical applications is an important issue. The proposed method hypothesizes an

Hong-Dun Lin; Kang-Ping Lin; Being-Tau Chung; Liang-Chih Wu; Ren-Shyan Liu

2003-01-01

331

An application of the learning theory to wavelet based signal denoising  

Microsoft Academic Search

In this paper the statistical learning theory is applied to signal denoising using wavelets. The methodology is based on the estimation of the functional relationship between the Vapnik-Chervonenkis (VC) dimension and approximation complexity. Experimental results confirm the basic assumptions.

M. Stankovic; S. Stankovic

2004-01-01

332

Natural Resource-Based Communities, Risk, and Disaster: An Intersection of Theories  

Microsoft Academic Search

Natural resource-based communities are often theoretically assumed to be vulnerable to the negative effects of environmental and social change. Such communities are also seen as being especially vulnerable to risks and disasters. Disaster research perspectives echo this in their emphasis on environmental and social vulnerability. Also, theories of risk largely fail to illuminate community level experiences. To address this gap,

COURTNEY G. FLINT; A. E. LULOFF

2005-01-01

333

A posteriori error estimation for elasto-plastic problems based on duality theory  

Microsoft Academic Search

In this paper we introduce a new approach to a posteriori error estimation for elasto-plastic problems based on the duality theory of the calculus of variations. We show that, in spite of the prevailing view, duality methods provide a viable way for obtaining computable a posteriori error estimates for nonlinear boundary value problems without directly solving the dual problem. Rigorous

Sergey I. Repin; Leonidas S. Xanthis

1996-01-01

334

Assessment of Prevalence of Persons with Down Syndrome: A Theory-Based Demographic Model  

ERIC Educational Resources Information Center

|Background: The Netherlands are lacking reliable empirical data in relation to the development of birth and population prevalence of Down syndrome. For the UK and Ireland there are more historical empirical data available. A theory-based model is developed for predicting Down syndrome prevalence in the Netherlands from the 1950s onwards. It is…

de Graaf, Gert; Vis, Jeroen C.; Haveman, Meindert; van Hove, Geert; de Graaf, Erik A. B.; Tijssen, Jan G. P.; Mulder, Barbara J. M.

2011-01-01

335

A theoretical framework of pedagogical agents based on psychological incentive mechanism and Artificial Psychology theory  

Microsoft Academic Search

This paper proposes an innovative teaching and learning theoretical framework based on psychological incentive mechanism and Artificial Psychology theory. Related works about these two areas will be addressed in section 2. This framework includes three type pedagogical agents, namely the Expert agent, the Mentor agent and the Motivator agent. This framework is intended to create a positive and personalized study

Tao Xiaome; Niu Qinzhou; Mike Jackson; Bin Hu

2008-01-01

336

Research on risk assessment for security system based on effectiveness evaluation theory  

Microsoft Academic Search

With the development of security system information degree and protection capability format, it is important to evaluate its effectiveness precisely to prevention and control of social order based on these changes. According to the operational characteristics of security system, protection format is divided into personal protection, physical protection, and electronic protection. Effectiveness evaluation theory is used to measure how the

Yujie Zheng

2010-01-01

337

Model and application of risk evaluation for construction project based on fuzzy theory  

Microsoft Academic Search

Any project is attached with risks, and same case with construction projects, whose risk is rather complicated. Finding out the risk factors of construction project is of great realistic significance and scientific value for scientific risk evaluation and accomplishment of construction project. Fuzzy mathematics theory for solving risk evaluation is put forward based on the complexity and nonlinearity of risk

Aifang Liu; Shandong Zibo

2010-01-01

338

Revisiting Transactional Distance Theory in a Context of Web-Based High-School Distance Education  

ERIC Educational Resources Information Center

The purpose of this paper is to report on a study that provided an opportunity to consider Transactional Distance Theory (TDT) in a current technology context of web-based learning in distance education (DE), high-school classrooms. Data collection relied on semi-structured interviews conducted with 22 e-teachers and managers in Newfoundland and…

Murphy, Elizabeth Anne; Rodriguez-Manzanares, Maria Angeles

2008-01-01

339

Evidence-Based Practice in Kinesiology: The Theory to Practice Gap Revisited  

ERIC Educational Resources Information Center

As evidence-based practice sweeps the applied health professions, it is a good time to evaluate the generation of knowledge in Kinesiology and its transmission to professionals and the public. Knowledge transmission has been debated in the past from the perspectives of the theory-to-practice gap and the discipline versus profession emphasis.…

Knudson, Duane

2005-01-01

340

Ultrafast optical signal processing based on quantum dot semiconductor optical amplifiers: theory and experiment  

Microsoft Academic Search

This paper provides current status and prospects of quantum-dot semiconductor optical amplifiers, based on our pioneering work covering the proposal of their promising features, the quantum-dot optical device theory, experimental demonstrations, and the design and assembly of all-optical switching modules.

Mitsuru Sugawara; Hiroji Ebe; Nobuaki Hatori; Yasuhiko Arakawa; Tomoyuki Akiyama; Kohji Otsubo; Yoshiaki Nakata

2004-01-01

341

Comparison on Bayesian Ying-Yang theory based clustering number selection criterion with information theoretical criteria  

Microsoft Academic Search

A criterion based on the Bayesian Ying Yang learning theory and system was proposed by Xu (1995, 1996, 1997) for selecting the number of clusters in the clustering analysis and the number of Gaussians in a finite mixture model. In this paper we compare the performance of this criterion with other existing cluster number selection criteria such as Akaike's information

Z. B. Lai; P. Guo; T. J. Wang; L. Xu

1998-01-01

342

The Issue of Endogeneity within Theory-Based, Quantitative Management Accounting Research  

Microsoft Academic Search

A current issue of potential concern in theory-based management accounting research is the extent to which endogeneity limits the validity of empirical testing of models. This paper aims to stimulate debate as to the meaning of endogeneity as it applies to (management) accounting research. The paper explains what endogeneity is, its causes and consequences, and potential ways of managing the

Robert H. Chenhall; Frank Moers

2007-01-01

343

Academic Library Service Consumer (User) Motivation Study based on Expectancy Theory  

Microsoft Academic Search

The purpose of this study is to provide a preliminary theoretical foundation of academic library service consumer motivation. To achieve this purpose, the study attempts to develop and test an academic library service consumer motivation model based on expectancy theory which was introduced by Victor H. Vroom (1964) and modified by Porter & Lawler (1968) and Campbell, Dunnette, Lawler, &

Seongsin Lee

2007-01-01

344

Intervention Mapping: A Process for Developing Theory and Evidence-Based Health Education Programs  

Microsoft Academic Search

The practice of health education involves three major program-planning activities: needs assessment, program development, and evaluation. Over the past 20 years, significant enhancements have been made to the conceptual base and practice of health education. Models that outline explicit procedures and detailed conceptualization of community assessment and evaluation have been developed. Other advancements include the application of theory to health

L. Kay Bartholomew; Guy S. Parcel; Gerjo Kok

1998-01-01

345

Classification of regions of solar activity based on methods of pattern recognition theory  

Microsoft Academic Search

Methods for predicting manifestations of solar activity based on pattern recognition theory were developed. The logical procedure for solving problems of forecasting solar activity is similar to forecasting by the synoptic method, but it is objective and can be fully automated. The actual execution of the scheme consists of the following: the general forecasting problem is formulated as forecasting the

S. I. Avdyushin; B. O. Berlyand; P. B. Dernshteyn; V. A. Burov

1983-01-01

346

Issues in Inquiry-Based Science Education Seen through Dewey's Theory of Inquiry  

ERIC Educational Resources Information Center

To understand the issues of inquiry-based education, I adopted John Dewey's theory of inquiry as the analytical framework to examine science learning activities, students' interactions, and education standards. Educators have tried to engage students in meaningful learning, but the analysis revealed that the meaning of inquiry was diverse:…

Won, Mihye

2009-01-01

347

Computer Aided Systems Theory and Knowledge-Based System Design and Simulation; Directions to Explore  

Microsoft Academic Search

This paper examines a possible merger of methods and techniques of Computer Aided Systems Theory (CAST) and Knowledge-Based System Design and Simulation Methodology. The basic tenets of both methodologies and the state of their implementation in computer-aided environments are discussed. The central focus of the paper is the application of CAST techniques to support the design model construction and development

Jerzy W. Rozenblit; Herbert Praehofer

1989-01-01

348

Item Response Theory with Estimation of the Latent Population Distribution Using Spline-Based Densities  

ERIC Educational Resources Information Center

|The purpose of this paper is to introduce a new method for fitting item response theory models with the latent population distribution estimated from the data using splines. A spline-based density estimation system provides a flexible alternative to existing procedures that use a normal distribution, or a different functional form, for the…

Woods, Carol M.; Thissen, David

2006-01-01

349

Fuzzy Group Decision Making Model Based on Credibility Theory and Gray Relative Degree  

Microsoft Academic Search

In this paper, the problems of fuzzy multi-attribute group decision making in which the attribute values are given in the form of linguistic fuzzy numbers are studied. First of all, a new method called fuzzy dominance is given for ranking trapezoidal fuzzy numbers based on the credibility theory. Then the TOWA operator is presented to aggregate the trapezoidal fuzzy numbers.

Congjun Rao; Jin Peng

2009-01-01

350

Transdiagnostic Theory and Application of Family-Based Treatment for Youth with Eating Disorders  

ERIC Educational Resources Information Center

|This paper describes the transdiagnostic theory and application of family-based treatment (FBT) for children and adolescents with eating disorders. We review the fundamentals of FBT, a transdiagnostic theoretical model of FBT and the literature supporting its clinical application, adaptations across developmental stages and the diagnostic…

Loeb, Katharine L.; Lock, James; Greif, Rebecca; le Grange, Daniel

2012-01-01

351

A Method of Designing Energy Tax Rate Based On Game Theory  

Microsoft Academic Search

In this paper, we propose a method of designing energy tax rate based on game the- ory. Through this method, the effect of energy tax on encouraging manufacturers' improvement in energy efficiency is enhanced. Consequently policy makers can reduce the average burden of manufacturers brought by energy tax. Through utilizing game theory in a numerical example, we explain the effect

Ying Li; Jin-chuan Cui

352

Two Prophecy Formulas for Assessing the Reliability of Item Response Theory-Based Ability Estimates  

ERIC Educational Resources Information Center

|Two new prophecy formulas for estimating item response theory (IRT)-based reliability of a shortened or lengthened test are proposed. Some of the relationships between the two formulas, one of which is identical to the well-known Spearman-Brown prophecy formula, are examined and illustrated. The major assumptions underlying these formulas are…

Raju, Nambury S.; Oshima, T.C.

2005-01-01

353

A meshless FPM model for solving nonlinear material problems with proportional loading based on deformation theory  

Microsoft Academic Search

In this work a methodology of meshless finite points method for the analysis of nonlinear material problems with proportional loading based on deformation theory is presented.In finite points method the approximation around each point is obtained by using weighted least square techniques. The discrete system of equation is constructed by means of a point collocation procedure. The non-dependence on a

L. Pérez-pozo; F. Perazzo; A. Angulo

2009-01-01

354

Research on electric mesh grid for seawater desalination based on rotation coupling electromagnetic theory  

Microsoft Academic Search

A novel method for seawater desalination based on the rotation coupling electromagnetic theory is proposed and the concept of electric mesh grid is given. The desalination function of electric mesh grid is realized by the electric field which is produced by network of high-density with the charge of the contrary sign. The process principle of electric mesh grid is introduced.

Shukang Cheng; Hailong Gong; Peng Zhang

2008-01-01

355

Unified interpretation for second-order subwavelength interference based on Feynman's path-integral theory  

SciTech Connect

The second-order spatial subwavelength interference pattern is observed in a modified Michelson interferometer with single-mode continuous-wave laser beams. By analyzing our subwavelength interference experiment based on Feynman's path integral theory, a unified interpretation for all the second-order subwavelength interference is suggested.

Liu Jianbin; Zhang Guoquan [MOE Key Laboratory of Weak Light Nonlinear Photonics, Nankai University, Tianjin 300457 (China) and Photonics Center, School of Physics, Nankai University, Tianjin 300071 (China)

2010-07-15

356

Accumulation of knowledge capabilities: The perspective of knowledge-based view and network theory  

Microsoft Academic Search

Studying network structures and network content from knowledge-based view and network theory, we conceptualize a framework of knowledge network. Our approach defines sequences as the set of network structure, knowledge heterogeneous, and knowledge cognition a firm coordinates with partners to accumulate knowledge capabilities. Using a sample of 144 high-technology firms in Taiwan, we empirically identify three critical factors of knowledge

Ming-Chao Wang; Shih-Chieh Fang

2011-01-01

357

Supporting Self-Regulated Personalised Learning through Competence-Based Knowledge Space Theory  

ERIC Educational Resources Information Center

|This article presents two current research trends in e-learning that at first sight appear to compete. Competence-Based Knowledge Space Theory (CBKST) provides a knowledge representation framework which, since its invention by Doignon & Falmagne, has been successfully applied in various e-learning systems (for example, Adaptive Learning with…

Steiner, Christina M.; Nussbaumer, Alexander; Albert, Dietrich

2009-01-01

358

Lift and Drag Prediction in Supersonic Region Based on Momentum Conservation Theory  

Microsoft Academic Search

Recently, as advanced drag prediction method in transonic region, a drag decomposition method is watched with keen interest. This method is based on and extended from the momentum conservation theory on the closed integral surface around the airplane, which is usually called `Control Volume Method' (CVM). In this paper, aiming the next target which is the drag decomposition in supersonic

Wataru Yamazaki; Kazuhiro Kusunose; Kisa Matsushima; Kazuhiro Nakahashi

2006-01-01

359

Stamping process modeling of auto-body panel based on hierarchical polychromatic sets theory  

Microsoft Academic Search

Based on analysis of auto-body panelpsilas stamping process characteristics and feature classification, a stamping process information model of auto-body panel is established by using hierarchical polychromatic sets theory. The complex process information of auto-body panel can be described formally in the model. Based on the model, the system framework and flow of stamping CAPP for auto-body panel are presented.

Zhao Liping; Liu Chuanwei; Li Zongbin; Yao Yiyong

2008-01-01

360

Review: GaN growth by ammonia based methods - density functional theory study  

Microsoft Academic Search

Recent results in Density Functional Theory (DFT) simulations of ammonia-based growth of gallium nitride on GaN (0001) are reviewed. These simulations are important to the following GaN growth methods that use ammonia as active nitrogen source: ammonothermal, MOVPE, HVPE and also ammonia-source MBE. In the simulations of GaN growth, the two main approaches were discussed: (1) equilibrium, based on chemical

S. Krukowski; P. Kempisty; P. Stra?k

2009-01-01

361

Enhanced Color-Theory-Based Dynamic Localization in Mobile Wireless Sensor Networks  

Microsoft Academic Search

There are few localization schemes targeted at mobile wireless sensor networks. This paper proposed an enhanced color-theory-based dynamic localization (E-CDL) which is based on the CDL algorithm (Shee, 2005). However, the location accuracy of this algorithm depends on the accuracy of the average hop distance derivation. Therefore, the authors present two novel schemes to estimate the average hop distance. The

Tzu-Chien Chang; Kuochen Wang; Yi-Ling Hsieh

2007-01-01

362

Using instructional theory to facilitate communication in Web-based courses  

Microsoft Academic Search

This articles examines the role of computer-mediated communication as well as broader interpretations of communication in Web-based instruction. Overviews of cognitive processing and cognitive constructivist paradigms are presented to illustrate their relevance for guiding development of Web-based courses. Instructional goals and communication strategies associated with these paradigms are identified. We conclude that developers should use instructional theories to guide choices

Susan M. Miller; Kenneth L. Miller

1999-01-01

363

The Resource-Based Theory of the Firm and Firm Survival  

Microsoft Academic Search

This paper examines the determinants of firm survival. We use hazard models to test a number of hypotheses mainly drawn from\\u000a the Resource-Based Theory of the Firm. According to the Resource-Based View the ability of a firm to develop distinct capabilities\\u000a enhances its ability to adapt to the changing competitive environment and improves its survival prospects. The results confirm\\u000a that

Silviano Esteve-Pérez; Juan A. Mañez-Castillejo

2008-01-01

364

The iSLIP scheduling algorithm for input-queued switches  

Microsoft Academic Search

An increasing number of high performance inter- networking protocol routers, LAN and asynchronous transfer mode (ATM) switches use a switched backplane based on a crossbar switch. Most often, these systems use input queues to hold packets waiting to traverse the switching fabric. It is well known that if simple first in first out (FIFO) input queues are used to hold

Nick McKeown

1999-01-01

365

On the number of input queues to efficiently support multicast traffic in input queued switches  

Microsoft Academic Search

The paper studies the design of IQ cell-based switch architectures with a reduced number of queues at input ports to support multicast traffic delivery. The design involves the definition of a queueing policy (to select how and where to enqueue packets) and of a scheduling policy (to select when and from which queue to transfer packets, satisfying the transmission constraints

Andrea Bianco; Paolo Giaccone; Emilio Leonardi; Fabio Neri; Chiara Piglione

2003-01-01

366

An electrification mechanism of sand grains based on the diffuse double layer and Hertz contact theory  

NASA Astrophysics Data System (ADS)

The electrification of sand grains lifting off from sand bed is investigated experimentally. It was found that sand grains were able to carry charges, which is comparable in magnitude with the experimental results and is related to grain sizes, pH of soil, relative humidity, and electric field. Based on the theory of diffuse double layer (DDL) and Hertz contact theory, an electrification mechanism due to the break of DDLs of sand grains is presented and a formula which takes environmental conditions and grain parameters into consideration is obtained to calculate the charge-mass ratio of lift-off sand grains.

Xie, Li; Han, Kui; Ma, Yanping; Zhou, Jùn

2013-09-01

367

Nursing theory-based independent nursing practice: a personal experience of closing the theory-practice gap.  

PubMed

The article presents a narrative and exemplar from an independent nursing practice underpinned by the theory of health as expanding consciousness. The journey illustrates the importance of developing personal and professional awareness of theories that are congruent with one's worldview. This enhances meaning in nursing practice and contributes to closing the theory-practice gap. The benefits of independent nursing practice to closing the gap are also discussed. PMID:21304284

Musker, Kathleen

368

Comparison of achievement test scores of piano students who participate in music theory learning activities based on the theory of multiple intelligences and students who participate in traditional piano studio theory activities  

Microsoft Academic Search

Piano students ages 7 to 11 who had five months to one year of piano study were assigned to two groups for music theory instruction. Control group A received a traditional approach using standardized workbook exercises. Experimental group B received instruction using learning centers based on the theory of multiple intelligences. The students met for one hour once a week

Lynette Schwane

1999-01-01

369

A closure for meso-scale eddy fluxes based on linear instability theory  

NASA Astrophysics Data System (ADS)

Linear instability theory is used to predict the lateral diffusivity K for eddy buoyancy fluxes in an idealized channel model, following a suggestion by Killworth (1997). The vertical structure and magnitude of K agree approximately with the non-linear model results. The lateral structure of K from linear theory lacks minima within eddy-driven zonal jets, pointing towards a non-linear mechanism for mixing barriers in the channel model. This effect can be accounted for by a modification of K from linear theory by the kinematic effect of the background flow following a recent suggestion by Ferrari and Nikurashin (2010). Implementation of this closure for K in an eddy mixing framework based on potential vorticity mixing in a zonally averaged model version yields approximate agreement with the zonally resolved version over a certain range of external parameters, in particular with respect to the reproduction of eddy-driven zonal jets.

Eden, Carsten

370

Analysis and synthesis of phase shifting algorithms based on linear systems theory  

NASA Astrophysics Data System (ADS)

We review and update a recently published formalism for the theory of linear Phase Shifting Algorithms (PSAs) based on linear filtering (systems) theory, mainly using the Frequency Transfer Function (FTF). The FTF has been for decades the standard tool in Electrical Engineering to analyze and synthesize their linear systems. Given the well defined FTF approach (matured over the last century), it clarifies, in our view, many not fully understood properties of PSAs. We present easy formulae for the spectra of the PSAs (the FTF magnitude), their Signal to Noise (S/N) power-ratio gain, their detuning robustness, and their harmonic rejection in terms of the FTF. This paper has more practical appeal than previous publications by the same authors, hoping to enrich the understanding of this PSA's theory as applied to the analysis and synthesis of temporal interferometry algorithms in Optical Metrology.

Servin, M.; Estrada, J. C.

2012-08-01

371

A structural-based microscopic theory on high-temperature cuprate superconductors  

NASA Astrophysics Data System (ADS)

Based entirely on the cuprate structure, a microscopic theory for high-temperature superconductivity is proposed. This theory produces quantitative fits to the normal phase properties such as Hall effect, resistivity, thermoelectric power, etc. It also reveals the existence of a pseudo-gap structure that has nodes along the diagonals of the basal plane. In the superconducting phase, an inverse parabolic dependences of Tc on hole density is a natural consequence. The optimum Tc value derived from the corresponding intrinsic hole density obtained from electronic structure agrees with the value obtained experimentally. This theory can also explain the observation of a strong spin fluctuation near Tc in the YBa2Cu3O7 (YBCO) and the absence of such in the Bi2Sr2CaCu2O8 (BiSCCO) system.

Wong, K. W.; Ching, W. Y.

2004-11-01

372

Theoretic Analysis & Study on Automobile EMC Based on the Synergetics Theory  

NASA Astrophysics Data System (ADS)

Considering the microelectronic application in the automobile of equipment increases, and the electromagnetic environment of external world worsens day by day, it is important to study the problems of the auto EMC. The traditional researching approaches of EMC have already become riper, but because of the complicated characteristics of the automobile's complex electronic system, there is no simple mathematical model to describe and analyze the auto EMC. The traditional methods mostly proceed with parameters of the circuits, and they have not risen to the system grade. They are based on the thought of reduction. As a kind of brand-new theory, synergetics pay more attention to the cooperation and competition between subsystems, and then it can reach harmonious stability from the whole. This paper investigates a new thought about applying the synergetics theory to the EMC' s analysis of the complex system like the Automobile's, thus received corresponding theory support.

Gao, Y. H.; Chang, X.; He, L. Q.; Tian, X. L.

2006-10-01

373

Receiver Based Management of Low Bandwidth Access Links  

Microsoft Academic Search

In this paper, we describe a receiver based con- gestion control policy that leverages TCP flo w control mech- anisms to prioritize mixed traffic loads across access links. We manage queuing at the access link to: (1) improve the response time of interactive network applications; (2) re- duce congestion-related packet losses; while (3) maintaining high throughput for bulk-transfer applications. Our

Neil T. Spring; Maureen Chesire; Mark Berryman; Vivek Sahasranaman; Thomas E. Anderson; Brian N. Bershad

2000-01-01

374

Evaluating clinical simulations for learning procedural skills: a theory-based approach.  

PubMed

Simulation-based learning is becoming widely established within medical education. It offers obvious benefits to novices learning invasive procedural skills, especially in a climate of decreasing clinical exposure. However, simulations are often accepted uncritically, with undue emphasis being placed on technological sophistication at the expense of theory-based design. The author proposes four key areas that underpin simulation-based learning, and summarizes the theoretical grounding for each. These are (1) gaining technical proficiency (psychomotor skills and learning theory, the importance of repeated practice and regular reinforcement), (2) the place of expert assistance (a Vygotskian interpretation of tutor support, where assistance is tailored to each learner's needs), (3) learning within a professional context (situated learning and contemporary apprenticeship theory), and (4) the affective component of learning (the effect of emotion on learning). The author then offers four criteria for critically evaluating new or existing simulations, based on the theoretical framework outlined above. These are: (1) Simulations should allow for sustained, deliberate practice within a safe environment, ensuring that recently-acquired skills are consolidated within a defined curriculum which assures regular reinforcement; (2) simulations should provide access to expert tutors when appropriate, ensuring that such support fades when no longer needed; (3) simulations should map onto real-life clinical experience, ensuring that learning supports the experience gained within communities of actual practice; and (4) simulation-based learning environments should provide a supportive, motivational, and learner-centered milieu which is conducive to learning. PMID:15917357

Kneebone, Roger

2005-06-01

375

Remote sensing image classification method based on evidence theory and decision tree  

NASA Astrophysics Data System (ADS)

Remote sensing image classification is an important and complex problem. Conventional remote sensing image classification methods are mostly based on Bayesian subjective probability theory, but there are many defects for its uncertainty. This paper firstly introduces evidence theory and decision tree method. Then it emphatically introduces the function of support degree that evidence theory is used on pattern recognition. Combining the D-S evidence theory with the decision tree algorithm, a D-S evidence theory decision tree method is proposed, where the support degree function is the tie. The method is used to classify the classes, such as water, urban land and green land with the exclusive spectral feature parameters as input values, and produce three classification images of support degree. Then proper threshold value is chosen and according image is handled with the method of binarization. Then overlay handling is done with these images according to the type of classifications, finally the initial result is obtained. Then further accuracy assessment will be done. If initial classification accuracy is unfit for the requirement, reclassification for images with support degree of less than threshold is conducted until final classification meets the accuracy requirements. Compared to Bayesian classification, main advantages of this method are that it can perform reclassification and reach a very high accuracy. This method is finally used to classify the land use of Yantai Economic and Technological Development Zone to four classes such as urban land, green land and water, and effectively support the classification.

Li, Xuerong; Xing, Qianguo; Kang, Lingyan

2010-10-01

376

Computing molecular fluctuations in biochemical reaction systems based on a mechanistic, statistical theory of irreversible processes.  

PubMed

We discuss the quantification of molecular fluctuations in the biochemical reaction systems within the context of intracellular processes associated with gene expression. We take the molecular reactions pertaining to circadian rhythms to develop models of molecular fluctuations in this chapter. There are a significant number of studies on stochastic fluctuations in intracellular genetic regulatory networks based on single cell-level experiments. In order to understand the fluctuations associated with the gene expression in circadian rhythm networks, it is important to model the interactions of transcriptional factors with the E-boxes in the promoter regions of some of the genes. The pertinent aspects of a near-equilibrium theory that would integrate the thermodynamical and particle dynamic characteristics of intracellular molecular fluctuations would be discussed, and the theory is extended by using the theory of stochastic differential equations. We then model the fluctuations associated with the promoter regions using general mathematical settings. We implemented ubiquitous Gillespie's algorithms, which are used to simulate stochasticity in biochemical networks, for each of the motifs. Both the theory and the Gillespie's algorithms gave the same results in terms of the time evolution of means and variances of molecular numbers. As biochemical reactions occur far away from equilibrium-hence the use of the Gillespie algorithm-these results suggest that the near-equilibrium theory should be a good approximation for some of the biochemical reactions. PMID:21187228

Kulasiri, Don

2011-01-01

377

Personality and Psychopathology: a Theory-Based Revision of Eysenck's PEN Model  

PubMed Central

The principal aim of this paper is to investigate whether it is possible to create a personality taxonomy of clinical relevance out of Eysenck’s original PEN model by repairing the various shortcomings that can be noted in Eysenck’s personality theory, particularly in relation to P or Psychoticism. Addressing three approaches that have been followed to answer the question ‘which personality factors are basic?’, arguments are listed to show that particularly the theory-informed approach, originally defended by Eysenck, may lead to scientific progress. However, also noting the many deficiencies in the nomological network surrounding P, the peculiar situation arises that we adhere to Eysenck’s theory-informed methodology, but criticize his theory. These arguments and criticisms led to the replacement of P by three orthogonal and theory-based factors, Insensitivity (S), Orderliness (G), and Absorption (A), that together with the dimensions E or Extraversion and N or Neuroticism, that were retained from Eysenck’s PEN model, appear to give a comprehensive account of the main vulnerability factors in schizophrenia and affective disorders, as well as in other psychopathological conditions.

van Kampen, Dirk

2009-01-01

378

Low jitter scheduling with redundancy control for input-queued switches  

NASA Astrophysics Data System (ADS)

In switch scheduling, jitter becomes an important performance criterion for increasing real-time applications. Low Jitter Decomposition (LJS) was proposed in the frame-based scheduling switches [9]. However, we notice that in LJS, the bandwidth requirement of schedule tables is greater than the actual amount of traffic. The redundant bandwidth requirement not only wastes the resource of switch, but also introduces an extra jitter. In this paper, we propose two algorithms to reduce the extra jitter caused by redundancy: Integer Average Redundancy Control (IARC) and Dichotomy Sequence Redundancy Control (DSRC). We demonstrate that the jitter bound of the two algorithms is lower than that of the scheme without redundancy control. Simulation experiments show that DSRC and IARC can reduce nearly 50% jitter of the scheme without redundancy control at medium switch load. We also show that DSRC has a low complexity (O(1) for each input-output pair) which is important for high-speed switches.

Cheng, Hong; Jin, Yaohui; Gao, Yu; Yu, YingDi; Guo, Wei; Sun, Weiqiang; Hu, Weisheng

2007-12-01

379

A device in order to improve the quality of machine translation, based on the correlational theory of thought  

Microsoft Academic Search

In this article the author describes a device in order to improve the quality of machine translation, con- ceived by Silvio Ceccato and based on his correlational theory of thought. Basing themselves on this theory Ceccato and his collaborators worked on the problem of machine translation from 1959 to 1966, carrying out almost exclusively theoretical researches. The project was interrupted

Giulio Benedetti

2005-01-01

380

[Application of the nursing process based on Orem's theory: a case study with a pregnant adolescent].  

PubMed

This is a descriptive study with a qualitative approach that aimed at applying the nursing process based in Orem Self-Care Theory, through a case study with a pregnant adolescent in order to identify the nursing diagnosis in the above mentioned clients, based on NANDA'S nursing diagnoses. Results obtained identified three nursing diagnoses: prejudiced adaptation, sleep disturb and familiar change process. The application of the nursing process based in Orem and the importance of the diagnosis identified for clients nursing care were evidenced. PMID:10734950

Torres, G de V; Davim, R M; da Nóbrega, M M

1999-04-01

381

An exploratory research on the formation and performance of Sino-foreign joint venture based on the Resource Based Theory  

Microsoft Academic Search

According to the Resource-Based Theory, the Sino-foreign joint venture is established to overcome the resource limits and gain the complementary resources. The resource uniqueness of joint ventures is determined by the resources complementary between the China company and foreign company, which brings about the potential competition advantages and the potential performance for the Sino-foreign joint ventures. In the process of

Huiming Cai

2011-01-01

382

Healthcare professionals' intentions and behaviours: A systematic review of studies based on social cognitive theories  

PubMed Central

Background There is an important gap between the implications of clinical research evidence and the routine clinical practice of healthcare professionals. Because individual decisions are often central to adoption of a clinical-related behaviour, more information about the cognitive mechanisms underlying behaviours is needed to improve behaviour change interventions targeting healthcare professionals. The aim of this study was to systematically review the published scientific literature about factors influencing health professionals' behaviours based on social cognitive theories. These theories refer to theories where individual cognitions/thoughts are viewed as processes intervening between observable stimuli and responses in real world situations. Methods We searched psycINFO, MEDLINE, EMBASE, CIHNAL, Index to theses, PROQUEST dissertations and theses and Current Contents for articles published in English only. We included studies that aimed to predict healthcare professionals' intentions and behaviours with a clear specification of relying on a social cognitive theory. Information on percent of explained variance (R2) was used to compute the overall frequency-weighted mean R2 to evaluate the efficacy of prediction in several contexts and according to different methodological aspects. The cognitive factors most consistently associated with prediction of healthcare professionals' intention and behaviours were documented. Results Seventy eight studies met the inclusion criteria. Among these studies, 72 provided information on the determinants of intention and 16 prospective studies provided information on the determinants of behaviour. The theory most often used as reference was the Theory of Reasoned Action (TRA) or its extension the Theory of Planned Behaviour (TPB). An overall frequency-weighted mean R2 of 0.31 was observed for the prediction of behaviour; 0.59 for the prediction of intention. A number of moderators influenced the efficacy of prediction; frequency-weighted mean R2 varied from 0.001 to 0.58 for behaviour and 0.19 to 0.81 for intention. Conclusion Our results suggest that the TPB appears to be an appropriate theory to predict behaviour whereas other theories better capture the dynamic underlying intention. In addition, given the variations in efficacy of prediction, special care should be given to methodological issues, especially to better define the context of behaviour performance.

Godin, Gaston; Belanger-Gravel, Ariane; Eccles, Martin; Grimshaw, Jeremy

2008-01-01

383

Time-dependent quasirelativistic density-functional theory based on the zeroth-order regular approximation.  

PubMed

A time-dependent quasirelativistic density-functional theory for excitation energies of systems containing heavy elements is developed, which is based on the zeroth-order regular approximation (ZORA) for the relativistic Hamiltonian and a noncollinear form for the adiabatic exchange-correlation kernel. To avoid the gauge dependence of the ZORA Hamiltonian a model atomic potential, instead of the full molecular potential, is used to construct the ZORA kinetic operator in ground-state calculations. As such, the ZORA kinetic operator no longer responds to changes in the density in response calculations. In addition, it is shown that, for closed-shell ground states, time-reversal symmetry can be employed to simplify the eigenvalue equation into an approximate form that is similar to that of time-dependent nonrelativistic density-functional theory. This is achieved by invoking an independent-particle approximation for the induced density matrix. The resulting theory is applied to investigate the global potential-energy curves of low-lying LambdaS- and omega omega-coupled electronic states of the AuH molecule. The derived spectroscopic parameters, including the adiabatic and vertical excitation energies, equilibrium bond lengths, harmonic and anharmonic vibrational constants, fundamental frequencies, and dissociation energies, are in good agreement with those of time-dependent four-component relativistic density-functional theory and ab initio multireference second-order perturbation theory. Nonetheless, this two-component relativistic version of time-dependent density-functional theory is only moderately advantageous over the four-component one as far as computational efforts are concerned. PMID:16238368

Peng, Daoling; Zou, Wenli; Liu, Wenjian

2005-10-01

384

Phase-field model during static recrystallization based on crystal-plasticity theory  

NASA Astrophysics Data System (ADS)

A numerical model and computational procedure for static recrystallization are developed using a phase-field method coupled with crystal-plasticity theory. In this model, first, the microstructure and dislocation density during the deformation process of a polycrystalline metal are simulated using a finite element method based on strain-gradient crystal-plasticity theory. Second, the calculated data are mapped onto the regular grids used in the phase-field simulation. The stored energy is calculated from the dislocation density and is smoothed to avoid computational difficulty. Furthermore, the misorientation required for nucleation criteria is calculated at all grid points. Finally, phase-field simulation of the nucleation and growth of recrystallization is performed using the mapped data. By performing a series of numerical simulations based on the proposed numerical procedure, it has been confirmed that the recrystallization microstructure can be reproduced from the deformation microstructure.

Takaki, T.; Yamanaka, A.; Higa, Y.; Tomita, Y.

2007-12-01

385

A new method of excitation control based on fuzzy set theory  

SciTech Connect

The synthesis of the structure of the PSS and its parameterization are based entirely on method of linear system theory. Thus the desorbed effect of the PSS is limited to a bounded area around one system operating point. The use of a controller based on fuzzy set theory introduces an event controlled excitation of the synchronous machine taking into account the power system operation. The desired response of the fuzzy controller is given by a set of rules which are obtained from the limits of the voltage regulator and the undesired performance of the conventional excitation control. A fuzzy controller has been developed for which simulation results are provided. These results support the concept of a fuzzy controller for the purpose of excitation control. They show that a well designed fuzzy controller is superior to a fast excitation control with an additional PSS.

Handschin, E.; Hoffmann, W.; Reyer, F.; Stephanblome, T.; Schluecking, U.; Westermann, D. (Univ. of Dortmund (Germany)); Ahmed, S.S. (Univ. of Cape Town (South Africa))

1994-02-01

386

Design of Flexure-based Precision Transmission Mechanisms using Screw Theory  

SciTech Connect

This paper enables the synthesis of flexure-based transmission mechanisms that possess multiple decoupled inputs and outputs of any type (e.g. rotations, translations, and/or screw motions), which are linked by designer-specified transmission ratios. A comprehensive library of geometric shapes is utilized from which every feasible concept that possesses the desired transmission characteristics may be rapidly conceptualized and compared before an optimal concept is selected. These geometric shapes represent the rigorous mathematics of screw theory and uniquely link a body's desired motions to the flexible constraints that enable those motions. This paper's impact is most significant to the design of nano-positioners, microscopy stages, optical mounts, and sensors. A flexure-based microscopy stage was designed, fabricated, and tested to demonstrate the utility of the theory.

Hopkins, J B; Panas, R M

2011-02-07

387

Distinguishing ability analysis of compressed sensing radar imaging based on information theory model  

NASA Astrophysics Data System (ADS)

Recent theory of compressed sensing (CS) has been widely used in many application areas. In this paper, we mainly concentrate on the CS in radar and analyze the distinguishing ability of CS radar image based on information theory model. The information content contained in the CS radar echoes is analyzed by simplifying the information transmission channel as a parallel Gaussian channel, and the relationship among the signal-to-noise ratio (SNR) of the echo signal, the number of required samples, the length of the sparse targets and the distinguishing level of the radar image is gotten. Based on this result, we introduced the distinguishing ability of the CS radar image and some of its properties are also gotten. Real IECAS advanced scanning two-dimensional railway observation (ASTRO) data experiment demonstrates our conclusions.

Jiang, Hai; Zhang, Bingchen; Lin, Yueguan; Hong, Wen; Wu, Yirong

2011-10-01

388

A theory-based logic model for innovation policy and evaluation.  

SciTech Connect

Current policy and program rationale, objectives, and evaluation use a fragmented picture of the innovation process. This presents a challenge since in the United States officials in both the executive and legislative branches of government see innovation, whether that be new products or processes or business models, as the solution to many of the problems the country faces. The logic model is a popular tool for developing and describing the rationale for a policy or program and its context. This article sets out to describe generic logic models of both the R&D process and the diffusion process, building on existing theory-based frameworks. Then a combined, theory-based logic model for the innovation process is presented. Examples of the elements of the logic, each a possible leverage point or intervention, are provided, along with a discussion of how this comprehensive but simple model might be useful for both evaluation and policy development.

Jordan, Gretchen B.

2010-04-01

389

A Measurement-Based Prioritization Scheme for Handovers in Mobile Cellular Networks  

Microsoft Academic Search

A method of improving the quality of service in mobile cellular systems based on prioritization of handover requests is presented. The objective is to improve perceived quality of cellular service by minimizing both the probability of forced termination of ongoing calls due to handover failures and the degradation in spectrum utilization. A model based on a multiple-priority nonpreemptive queuing discipline

Sirin Tekinay; Bijan Jabbari

1992-01-01

390

The Analysis of Fairness of the E-commerce Protocol Based on Dynamic Game Theory  

Microsoft Academic Search

Along with the rapid development of e-commerce, the problems of which has become more and more prominent. One of important problem is the defects of fairness of e-commerce protocol, which make the consumer suffer losses while behavior of operators has not existed fault in business. In this paper, I built e-commerce system model based on dynamic game theory, and put

Fuquan Liu; Yuan Chen; Xiuli-Cao; Yunfeng Song

2009-01-01

391

Multi-Agent Systems: A Theory Based on Organization and Communication Concepts  

Microsoft Academic Search

This paper presents a theory for multi-agent systems based on communication concepts and organization concepts. The language of formulation is a first-order, multi-modal, linear-time logic. The underlying seman- tics of this language are labeled transition systems. An agent state is described by a triplet including beliefs, goals as communication concepts and roles as organi- zation concepts. A transition consists of

Walid Chainbi

1999-01-01

392

Information-theory-based solution of the inverse problem in classical statistical mechanics.  

PubMed

We present a procedure for the determination of the interaction potential from the knowledge of the radial pair distribution function. The method, realized inside an inverse Monte Carlo simulation scheme, is based on the application of the maximum entropy principle of information theory and the interaction potential emerges as the asymptotic expression of the transition probability. Results obtained for high density monoatomic fluids are very satisfactory and provide an accurate extraction of the potential, despite a modest computational effort. PMID:20866796

D'Alessandro, Marco; Cilloco, Francesco

2010-08-30

393

Testing a self-determination theory-based teaching style intervention in the exercise domain  

Microsoft Academic Search

Drawing from self-determination theory (SDT), this study examined the effect of an autonomy supportive, well structured and interpersonally involving teaching style on exercise class participants' psychological need satisfaction, motivational regulations, exercise behaviour, behavioural intention and affect. Female exercise class participants enrolled in a 10-week exercise program were exposed to an SDT-based (i.e. SDTc; n ¼ 25) or typical (i.e. control

Jemma Edmunds; Nikos Ntoumanis; Joan L Duda

2008-01-01

394

Research on improvement of model-free learning adaptive controller based on multi-innovation theory  

Microsoft Academic Search

To improve the convergence rate of model-free learning adaptive controller (MFLAC). A new design method of MFLAC is presented in this paper. We extend the model-free control law from signal innovation form to multi-innovation form based on the multi-innovation theory and the parameters are optimized by artificial fish swarm algorithm (AFSA).The performance analysis and simulation results show that the proposed

Yu Hua-bing; Qin Pin-le

2010-01-01

395

Equivalent-Circuit Model for High-Capacitance MLCC Based on Transmission-Line Theory  

Microsoft Academic Search

This paper provides a modeling methodology for high-capacitance multilayer ceramic capacitors (MLCCs) based on the transmission-line theory. To model the high-capacitance MLCC comprised of hundreds of thin layers, a distributed equivalent circuit is modified to a transmission-line circuit. Simpler models for MLCCs are demonstrated using a continued fractions approximation from the transmission-line input impedance equation. A second-order model predicts MLCC

Myoung-Gyun Kim; Byoung Hwa Lee; Tae-Yeoul Yun

2012-01-01

396

Non-linear surface wave phase velocity inversion based on ray theory  

Microsoft Academic Search

The development of temporary and permanent broad-band seismic arrays reinforces the need for advanced interpretation techniques in surface-wave analysis. We present a new method based on 2-D paraxial ray theory of inverting teleseismic surface-wave phase information and constructing phase velocity maps on a regional scale. Measurements of local phase velocities and propagation directions of Rayleigh waves taken from full waveform

Marianne Bruneton; Véronique Farra; Helle Anette Pedersen

2002-01-01

397

Response to Tudor: Remorse-based Sentence Reductions in Theory and Practice  

Microsoft Academic Search

Steven Tudor defends the mitigation of criminal sentences in cases in which offenders are genuinely remorseful for their crimes.\\u000a More than this, he takes the principle that such remorse-based sentence reductions are appropriate to be a ‘well-settled legal\\u000a principle’—so well settled, in fact, that ‘it is among those deep-seated commitments which can serve to test general theories\\u000a as much as

Richard L. Lippke

2008-01-01

398

Competence-Based Knowledge Space Theory as a Framework for Intelligent Metacognitive Scaffolding  

Microsoft Academic Search

\\u000a To help learners in acquiring metacognitive skills that are necessary for successfully planning, monitoring, and regulating\\u000a their learning, metacognitive support and scaffolding mechanisms are needed. Competence-based Knowledge Space Theory constitutes\\u000a a theoretical framework mainly used for personalising learning to individual learners’ domain-specific competence. The paper\\u000a outlines how this theoretical framework can be utilized for adaptive metacognitive scaffolding tailored to individual

Christina M. Steiner; Dietrich Albert

399

Dynamic stability of laminated FGM plates based on higher-order shear deformation theory  

Microsoft Academic Search

This paper conducts a dynamic stability analysis of symmetrically laminated FGM rectangular plates with general out-of-plane supporting conditions, subjected to a uniaxial periodic in-plane load and undergoing uniform temperature change. Theoretical formulations are based on Reddy’s third-order shear deformation plate theory, and account for the temperature dependence of material properties. A semi-analytical Galerkin-differential quadrature approach is employed to convert the

J. Yang; K. M. Liew; S. Kitipornchai

2004-01-01

400

Design and Analysis of Frame-Based Fair Queuing: A New Traffic Scheduling Algorithm for Packet Switched Networks  

Microsoft Academic Search

In this paper we introduce and analyze . This class of algorithms provides the same end-to-end delay and burstiness bounds as PGPS, but allows more flexibility in the design and implementation of the algorithm. We provide a systematic analysis of this class of schedulers and obtain bounds on their fairness.

Dimitrios Stiliadis; Anujan Varma

1996-01-01

401

A theory-based approach to thermal field-flow fractionation of polyacrylates.  

PubMed

A theory-based approach is presented for the development of thermal field-flow fractionation (ThFFF) of polyacrylates. The use of ThFFF for polymer analysis has been limited by an incomplete understanding of the thermal diffusion which plays an important role in retention and separation. Hence, a tedious trial-and-error approach to method development has been the normal practice when analyzing new materials. In this work, thermal diffusion theories based on temperature dependent osmotic pressure gradient and polymer-solvent interaction parameters were used to estimate thermal diffusion coefficients (D(T)) and retention times (t(r)) for different polymer-solvent pairs. These calculations identified methyl ethyl ketone as a solvent that would cause significant retention of poly(n-butyl acrylate) (PBA) and poly(methyl acrylate) (PMA). Experiments confirmed retention of these two polymers that have not been previously analyzed by ThFFF. Theoretical and experimental D(T)s and t(r)s for PBA, PMA, and polystyrene in different solvents agreed to within 20% and demonstrate the feasibility of this theory-based approach. PMID:21872869

Runyon, J Ray; Williams, S Kim Ratanathanawongs

2011-08-12

402

Doubly special relativity theories as different bases of kappa-Poincaré algebra  

Microsoft Academic Search

Doubly Special Relativity (DSR) theory is a theory with two observer-independent scales, of velocity and mass (or length). Such a theory has been proposed by Amelino-Camelia as a kinematic structure which may underline quantum theory of relativity. Recently another theory of this kind has been proposed by Magueijo and Smolin. In this Letter we show that both these theories can

J. Kowalski-Glikmanand; S. Nowak

2002-01-01

403

Simple Models for Airport Delays During Transition to a Trajectory-Based Air Traffic System  

NASA Astrophysics Data System (ADS)

It is now widely recognised that a paradigm shift in air traffic control concepts is needed. This requires state-of-the-art innovative technologies, making much better use of the information in the air traffic management (ATM) system. These paradigm shifts go under the names of NextGen in the USA and SESAR in Europe, which inter alia will make dramatic changes to the nature of airport operations. A vital part of moving from an existing system to a new paradigm is the operational implications of the transition process. There would be business incentives for early aircraft fitment, it is generally safer to introduce new technologies gradually, and researchers are already proposing potential transition steps to the new system. Simple queuing theory models are used to establish rough quantitative estimates of the impact of the transition to a more efficient time-based navigational and ATM system. Such models are approximate, but they do offer insight into the broad implications of system change and its significant features. 4D-equipped aircraft in essence have a contract with the airport runway and, in return, they would get priority over any other aircraft waiting for use of the runway. The main operational feature examined here is the queuing delays affecting non-4D-equipped arrivals. These get a reasonable service if the proportion of 4D-equipped aircraft is low, but this can deteriorate markedly for high proportions, and be economically unviable. Preventative measures would be to limit the additional growth of 4D-equipped flights and/or to modify their contracts to provide sufficient space for the non-4D-equipped flights to operate without excessive delays. There is a potential for non-Poisson models, for which there is little in the literature, and for more complex models, e.g. grouping a succession of 4D-equipped aircraft as a batch.

Brooker, Peter

404

Perturbation theory based on the Variational Nodal Transport method in X-Y-Z geometry  

SciTech Connect

A perturbation method based on the Variational Nodal Method (VNM) of solving the neutron transport equation is developed for three-dimensional Cartesian geometry. The method utilizes the solution of the corresponding adjoint transport equation to calculate changes in the critical eigenvalue due to changes in cross sections. Both first order and exact perturbation theory expressions are derived. The adjoint solution algorithm has been formulated and incorporated into the VNM option of the Argonne National Laboratory DEF3D production code. The perturbation method is currently implemented as a post-processor to the VNM option of the DIF3D code. To demonstrate the efficacy of the method, example perturbations are applied to the Takeda Benchmark Model 1. In the first perturbation example, the thermal capture cross section is increased within the core region. For the second perturbation example, the increase in the thermal capture cross section is applied in the control rod region. The resulting changes in the critical eigenvalue are obtained by direct calculation in the VNM and compared to the change approximated by the first order and exact theory expressions from the perturbation method. Exact perturbation theory results are inexcellent agreement with the actual eigenvalue differences calculated in the VNM. First order theory holds well for sufficiently small perturbations.

Laurin-Kovitz, K.F.; Lewis, E.E. [Northwestern Univ., Evanston, IL (United States). Dept. of Mechanical Engineering

1995-07-01

405

Energy decomposition analysis based on a block-localized wavefunction and multistate density functional theory  

PubMed Central

An interaction energy decomposition analysis method based on the block-localized wavefunction (BLW-ED) approach is described. The first main feature of the BLW-ED method is that it combines concepts of valence bond and molecular orbital theories such that the intermediate and physically intuitive electron-localized states are variationally optimized by self-consistent field calculations. Furthermore, the block-localization scheme can be used both in wave function theory and in density functional theory, providing a useful tool to gain insights on intermolecular interactions that would otherwise be difficult to obtain using the delocalized Kohn–Sham DFT. These features allow broad applications of the BLW method to energy decomposition (BLW-ED) analysis for intermolecular interactions. In this perspective, we outline theoretical aspects of the BLW-ED method, and illustrate its applications in hydrogen-bonding and ?–cation intermolecular interactions as well as metal–carbonyl complexes. Future prospects on the development of a multistate density functional theory (MSDFT) are presented, making use of block-localized electronic states as the basis configurations.

Bao, Peng

2013-01-01

406

Coherent reverberation model based on adiabatic normal mode theory in a range dependent shallow water environment  

NASA Astrophysics Data System (ADS)

Ocean reverberation in shallow water is often the predominant background interference in active sonar applications. It is still an open problem in underwater acoustics. In recent years, an oscillation phenomenon of the reverberation intensity, due to the interference of the normal modes, has been observed in many experiments. A coherent reverberation theory has been developed and used to explain this oscillation phenomenon [F. Li et al., Journal of Sound and Vibration, 252(3), 457-468, 2002]. However, the published coherent reverberation theory is for the range independent environment. Following the derivations by F. Li and Ellis [D. D. Ellis, J. Acoust. Soc. Am., 97(5), 2804-2814, 1995], a general reverberation model based on the adiabatic normal mode theory in a range dependent shallow water environment is presented. From this theory the coherent or incoherent reverberation field caused by sediment inhomogeneity and surface roughness can be predicted. Observations of reverberation from the 2001 Asian Sea International Acoustic Experiment (ASIAEX) in the East China Sea are used to test the model. Model/data comparison shows that the coherent reverberation model can predict the experimental oscillation phenomenon of reverberation intensity and the vertical correlation of reverberation very well.

Li, Zhenglin; Zhang, Renhe; Li, Fenghua

2010-09-01

407

A new probability distribution model of turbulent irradiance based on Born perturbation theory  

NASA Astrophysics Data System (ADS)

The subject of the PDF (Probability Density Function) of the irradiance fluctuations in a turbulent atmosphere is still unsettled. Theory reliably describes the behavior in the weak turbulence regime, but theoretical description in the strong and whole turbulence regimes are still controversial. Based on Born perturbation theory, the physical manifestations and correlations of three typical PDF models (Rice-Nakagami, exponential-Bessel and negative-exponential distribution) were theoretically analyzed. It is shown that these models can be derived by separately making circular-Gaussian, strong-turbulence and strong-turbulence-circular-Gaussian approximations in Born perturbation theory, which denies the viewpoint that the Rice-Nakagami model is only applicable in the extremely weak turbulence regime and provides theoretical arguments for choosing rational models in practical applications. In addition, a common shortcoming of the three models is that they are all approximations. A new model, called the Maclaurin-spread distribution, is proposed without any approximation except for assuming the correlation coefficient to be zero. So, it is considered that the new model can exactly reflect the Born perturbation theory. Simulated results prove the accuracy of this new model.

Wang, Hongxing; Liu, Min; Hu, Hao; Wang, Qian; Liu, Xiguo

2010-10-01

408

Designing a Project-based Learning in a University with New Theory of Learning  

NASA Astrophysics Data System (ADS)

New theory of learning indicates “learning” is the process of interaction which occurs in social relationships within a community containing a multitude of things beyond any single individual. From this point of view, the “project-based learning” is one of new methods of teaching and learning at university. The method of project-based learning includes of team learning, team teaching, portfolio assessment, open space, and faculty development. This paper discusses potential of university to become a learning community with the method along with results of the educational practice at Future University-Hakodate.

Mima, Noyuri

409

The theory of community based health and safety programs: a critical examination  

PubMed Central

This paper examines the theoretical underpinning of the community based approach to health and safety programs. Drawing upon the literature, a theory is constructed by elucidating assumptions of community based programs. The theory is then put to test by analyzing the extent to which the assumptions are supported by empirical evidence and the extent to which the assumptions have been applied in community based injury prevention practice. Seven principles representing key assumptions of the community based approach to health and safety programs are identified. The analysis suggests that some of the principles may have important shortcomings. Programs overwhelmingly define geographical or geopolitical units as communities, which is problematic considering that these entities can be heterogeneous and characterized by a weak sense of community. This may yield insufficient community mobilization and inadequate program reach. At the same time, none of the principles identified as most plausible appears to be widely or fully applied in program practice. The implication is that many community based health and safety programs do not function at an optimum level, which could explain some of the difficulties in demonstrating effectiveness seen with many of these programs.

Nilsen, P

2006-01-01

410

The theory of community based health and safety programs: a critical examination.  

PubMed

This paper examines the theoretical underpinning of the community based approach to health and safety programs. Drawing upon the literature, a theory is constructed by elucidating assumptions of community based programs. The theory is then put to test by analyzing the extent to which the assumptions are supported by empirical evidence and the extent to which the assumptions have been applied in community based injury prevention practice. Seven principles representing key assumptions of the community based approach to health and safety programs are identified. The analysis suggests that some of the principles may have important shortcomings. Programs overwhelmingly define geographical or geopolitical units as communities, which is problematic considering that these entities can be heterogeneous and characterized by a weak sense of community. This may yield insufficient community mobilization and inadequate program reach. At the same time, none of the principles identified as most plausible appears to be widely or fully applied in program practice. The implication is that many community based health and safety programs do not function at an optimum level, which could explain some of the difficulties in demonstrating effectiveness seen with many of these programs. PMID:16751442

Nilsen, P

2006-06-01

411

Randomised controlled trial of a brief theory-based intervention promoting breakfast consumption.  

PubMed

The present study sought to test the efficacy of a brief theory-based intervention to promote regular consumption of breakfast, and to expand previous results suggesting that the theory of planned behaviour (TPB) can be meaningfully applied to breakfast consumption. A four-armed randomised controlled trial was conducted. Participants (n=349) were allocated to receive either a (1) positively framed attitude intervention, (2) negatively framed attitude intervention, (3) Perceived Behavioural Control (PBC) intervention, or (4) control task. Attitude, subjective norm, PBC and behaviour were measured at baseline and 4-week follow-up. All three interventions employed persuasive communication and an implementation intention task. The intervention did not result in expected increases in breakfast consumption, or in changes in attitude, subjective norm or PBC. However, baseline attitude, subjective norm and PBC predicted 39.3% of baseline intention. Baseline intention in turn predicted 33% of breakfast consumption at 4 weeks. Change in breakfast consumption was predicted by change in attitude, subjective norm, and PBC between baseline and follow-up. Despite a lack of intervention effects, the TPB provided a good model of breakfast consumption over the four-week follow-up period. By expanding on previous work investigating breakfast consumption using the TPB, this study provides further support for the argument that that theory based interventions could result in meaningful increases in breakfast consumption. PMID:21163311

Kothe, Emily J; Mullan, Barbara A; Amaratunga, Rajith

2010-12-14

412

A criterion for the fragmentation of bubbly magma based on brittle failure theory  

NASA Astrophysics Data System (ADS)

The fragmentation of bubbly magma is a defining point in a volcanic eruption-before fragmentation the magma flows relatively slowly, during fragmentation the bubbles break up to release compressed gas and, afterwards, the eruption becomes a violent gas flow carrying suspended magma particles. Seemingly benign lava flows or domes can suddenly fragment into deadly pyroclastic flows. Several criteria have been proposed to define the point of magma fragmentation or foam stability. The criterion of Papale is based on melt relaxation theory and equates magma strain rate with the rate of increase of flow velocity with distance. It ignores, however, the role of bubble pressure in causing fragmentation. Two empirical approaches consider the role of high bubble pressure in causing fragmentation but do not address the underlying physics of magma fragmentation. Here I develop a fragmentation criterion for bubbly magma based on brittle failure theory and apply it to the fragmentation of lava domes and flows. On the basis of this theory, a bubbly magma will fragment when the tensile stress at the inner walls of bubbles exceeds the tensile strength of the magma. The fragmentation conditions depend strongly on initial water content, with calculated vesicularity and final water levels coinciding reasonably well with those in observed pumices. This suggests that the proposed criterion captures the essence of the fragmentation process in bubbly magma.

Zhang, Youxue

1999-12-01

413

Transient Heat Conduction in a Functionally Graded Cylindrical Panel Based on the Dual Phase Lag Theory  

NASA Astrophysics Data System (ADS)

The transient heat conduction in a functionally graded cylindrical panel is investigated based on the dual phase lag (DPL) theory in this article. Except for the phase lags which are assumed to be constant, all the other material properties of the panel are assumed to change continuously along the radial direction according to a power-law formulation with different non-homogeneity indices. The heat conduction equations based on the DPL theory in the cylindrical coordinate system are written in a general form which are then used for the analyses of four different geometries: (1) a hollow cylinder of an infinite length; (2) a hollow cylinder of a finite length; (3) a cylindrical panel of an infinite length; and (4) a cylindrical panel of a finite length. Using the Laplace transform, the analytical solutions for temperature and heat flux are obtained in the Laplace domain. The solutions are then converted into the time domain by employing the fast Laplace inversion technique. The exact expressions for the radial thermal wave speed are obtained for the four different geometries. The numerical results are displayed to reveal the effect of different approximations of the DPL theory on the temperature distribution for various non-homogeneity indices. The results are verified with those reported in the literature.

Akbarzadeh, A. H.; Chen, Z. T.

2012-06-01

414

Promoting fruit and vegetable consumption. Testing an intervention based on the theory of planned behaviour.  

PubMed

This study evaluated the efficacy of a theory of planned behaviour (TPB) based intervention to increase fruit and vegetable consumption. The extent to which fruit and vegetable consumption and change in intake could be explained by the TPB was also examined. Participants were randomly assigned to two levels of intervention frequency matched for intervention content (low frequency n=92, high frequency n=102). Participants received TPB-based email messages designed to increase fruit and vegetable consumption, messages targeted attitude, subjective norm and perceived behavioural control (PBC). Baseline and post-intervention measures of TPB variables and behaviour were collected. Across the entire study cohort, fruit and vegetable consumption increased by 0.83 servings/day between baseline and follow-up. Intention, attitude, subjective norm and PBC also increased (p<.05). The TPB successfully modelled fruit and vegetable consumption at both time points but not behaviour change. The increase of fruit and vegetable consumption is a promising preliminary finding for those primarily interested in increasing fruit and vegetable consumption. However, those interested in theory development may have concerns about the use of this model to explain behaviour change in this context. More high quality experimental tests of the theory are needed to confirm this result. PMID:22349778

Kothe, E J; Mullan, B A; Butow, P

2012-02-17

415

Web-Based Learning Environment: A Theory-Based Design Process for Development and Evaluation  

ERIC Educational Resources Information Center

|Web-based courses and programs have increasingly been developed by many academic institutions, organizations, and companies worldwide due to their benefits for both learners and educators. However, many of the developmental approaches lack two important considerations needed for implementing Web-based learning applications: (1) integration of the…

Nam, Chang S.; Smith-Jackson, Tonya L.

2007-01-01

416

Complexity theory and the "puzzling" competencies: Systems-based Practice And Practice-based Learning explored.  

PubMed

Of all the clinical competencies, the least understood are Systems-Based Practice and Practice-Based Learning and Improvement. With a shift to competency-based education and evaluation across the spectrum of surgical education and practice, a clear understanding of the power and utility of each competency is paramount. Health care operates as a complex adaptive system, with dynamics foreign to many health care professionals and educators. The adaptation and evolution of such a system is related directly to both the individual and the organizational learning of the agents within the system and knowledge management strategies. Far from being "difficult," Systems-Based Practice and Practice-Based Learning form the heart of quality improvement initiatives and future productivity advances in health care. PMID:20656610

Gonnering, Russell S

417

Theory of energy transfer interactions near sphere and nanoshell based plasmonic nanostructures  

NASA Astrophysics Data System (ADS)

Theory of energy transfer interactions between a pair of two level molecules in the molecular nanojunction including surface plasmon (SP) dressed interaction of plasmonic nanostructure, replicating metallic leads is presented. Results on the modification of bare dipolar interaction, known to be responsible for molecular energy transfer processes, in the proximity of metallic nanosystem are presented. Specifically, the manuscript includes theoretical investigation of nanosphere (NSP) monomer, nanoshell (NSH) monomer, and coupled nanosphere pair (dimer) based nanosystems. Closed form analytical expressions for NSP and NSH structures tailored for molecular nanojunction geometry are derived in the theoretical framework of multipole spectral expansion (MSE) method, which is straightforwardly extendible to dimers and multimers. The role of size and dielectric environment on energy transfer is investigated and interpreted. Theory predicts that the monomer and dimer both enhance the dipolar interaction, yet, dimer geometry is favorable due to its spectral tuning potential originated from plasmon hybridization and true resemblance with typical molecular nanojunctions.

Shishodia, Manmohan S.; Fainberg, Boris D.; Nitzan, Abraham

2011-09-01

418

Image Segmentation Using Fuzzy Clustering with Spatial Constraints Based on Markov Random Field via Bayesian Theory  

NASA Astrophysics Data System (ADS)

Image segmentation is an essential processing step for many image analysis applications. In this paper, a novel image segmentation algorithm using fuzzy C-means clustering (FCM) with spatial constraints based on Markov random field (MRF) via Bayesian theory is proposed. Due to disregard of spatial constraint information, the FCM algorithm fails to segment images corrupted by noise. In order to improve the robustness of FCM to noise, a powerful model for the membership functions that incorporates local correlation is given by MRF defined through a Gibbs function. Then spatial information is incorporated into the FCM by Bayesian theory. Therefore, the proposed algorithm has both the advantages of the FCM and MRF, and is robust to noise. Experimental results on the synthetic and real-world images are given to demonstrate the robustness and validity of the proposed algorithm.

Li, Xiaohe; Zhang, Taiyi; Qu, Zhan

419

An English Vocabulary Learning System Based on Fuzzy Theory and Memory Cycle  

NASA Astrophysics Data System (ADS)

This paper proposes an English Vocabulary Learning System based on the Fuzzy Theory and the Memory Cycle Theory to help a learner to memorize vocabularies easily. By using fuzzy inferences and personal memory cycles, it is possible to find an article that best suits a learner. After reading an article, a quiz is provided for the learner to improve his/her memory of the vocabulary in the article. Early researches use just explicit response (ex. quiz exam) to update memory cycles of newly learned vocabulary; apart from that approach, this paper proposes a methodology that also modify implicitly the memory cycles of learned word. By intensive reading of articles recommended by our approach, a learner learns new words quickly and reviews learned words implicitly as well, and by which the vocabulary ability of the learner improves efficiently.

Wang, Tzone I.; Chiu, Ti Kai; Huang, Liang Jun; Fu, Ru Xuan; Hsieh, Tung-Cheng

420

A second order analytical atmospheric drag theory based on the TD88 thermospheric density model  

NASA Astrophysics Data System (ADS)

A second order atmospheric drag theory based on the usage of TD88 model is constructed. It is developed to the second order in terms of TD88 small parameters K n, j . The short periodic perturbations, of all orbital elements, are evaluated. The secular perturbations of the semi-major axis and of the eccentricity are obtained. The theory is applied to determine the lifetime of the satellites ROHINI (1980 62A), and to predict the lifetime of the microsatellite MIMOSA. The secular perturbations of the nodal longitude and of the argument of perigee due to the Earth’s gravity are taken into account up to the second order in Earth’s oblateness.

El-Salam, F. A. Abd.; Sehnal, L.

2004-11-01

421

Mean-field theory for spin ladders using angular-momentum coupled bases  

SciTech Connect

We study properties of two-leg Heisenberg spin ladders in a mean-field approximation using a variety of angular-momentum-coupled bases. The mean-field theory proposed by Gopalan, Rice, and Sigrist, which uses a rung basis, assumes that the mean-field ground state consists of a condensate of spin singlets along the rungs of the ladder. We generalize this approach to larger angular-momentum-coupled bases that incorporate{emdash}by their mere definition{emdash}a substantial fraction of the important short-range structure of these materials. In these bases the mean-field ground state remains a condensate of spin singlet{emdash}but now with each involving a larger fraction of the spins in the ladder. As expected, the {open_quotes}purity{close_quotes} of the ground state, as judged by the condensate fraction, increases with the size of the elementary block defining the basis. Moreover, the coupling to quasiparticle excitations becomes weaker as the size of the elementary block increases. Thus, the weak-coupling limit of the theory becomes an accurate representation of the underlying mean-field dynamics. We illustrate the method by computing static and dynamic properties of two-leg ladders in the various angular-momentum-coupled bases. {copyright} {ital 1999} {ital The American Physical Society}

Piekarewicz, J. [Department of Physics and Supercomputer Computations Research Institute, Florida State University, Tallahassee, Florida 32306 (United States); Shepard, J.R. [Department of Physics, University of Colorado, Boulder, Colorado 80309 (United States)

1999-10-01

422

A Bifactor Multidimensional Item Response Theory Model for Differential Item Functioning Analysis on Testlet-Based Items  

ERIC Educational Resources Information Center

|A differential item functioning (DIF) detection method for testlet-based data was proposed and evaluated in this study. The proposed DIF model is an extension of a bifactor multidimensional item response theory (MIRT) model for testlets. Unlike traditional item response theory (IRT) DIF models, the proposed model takes testlet effects into…

Fukuhara, Hirotaka; Kamata, Akihito

2011-01-01

423

How Does an Activity Theory Model Help to Know Better about Teaching with Electronic-Exercise-Bases?  

ERIC Educational Resources Information Center

The research presented in this paper relies on Activity Theory and particularly on Engestrom's model, to better understand the use of Electronic-Exercise-Bases (EEB) by mathematics teachers. This theory provides a holistic approach to illustrate the complexity of the EEB integration. The results highlight reasons and ways of using EEB and show…

Abboud-Blanchard, Maha; Cazes, Claire

2012-01-01

424

A modal of the heart disease severity diagnosis and evaluation based on rough set theory and BP neural network  

Microsoft Academic Search

A modal Based on rough set theory and BP neural network for the heart disease severity diagnosis and evaluation is proposed. According to the heart disease symptoms data quantized by Konhonen neural network, a decision table is created and reduced using the rough set theory. After reducing the decision table, the symptoms data are the input of the BP neural

Hai-tao Li; Ai-song Shi; Ke-zhou Li

2010-01-01

425

Effects of a Theory-Based Feedback and Consultation Process on Instruction and Learning in College Classrooms  

Microsoft Academic Search

This study examined how midterm student ratings feedback provided to teaching assistants via a theory-based ratings instrument, combined with consultation on instructional practices, would affect teaching practices, ratings of teaching effectiveness, and student learning and motivation. The student ratings instrument that was employed focused on a series of instructional activities derived from Gagné's theory of instruction and Reiser and Dick's

Scott E. Hampton; Robert A. Reiser

2004-01-01

426

Study on the Mechanisms of Team Learning upon Knowledge Transfer: A Research Based on Social Constructivism Learning Theory  

Microsoft Academic Search

The paper interpreted the knowledge transfer from the constructivist perspective based on the social constructivism learning theory, and divided the entire process into four stages: recognition, interaction, application and integration. This paper built the influence factors model of knowledge transfer under the theory of social constructivism, and introduced the team learning. After the theoretical review, the author pointed that the

Li Mingfei; Zhou Jie

2010-01-01

427

A sampling-based computational strategy for the representation of epistemic uncertainty in model predictions with evidence theory.  

SciTech Connect

Evidence theory provides an alternative to probability theory for the representation of epistemic uncertainty in model predictions that derives from epistemic uncertainty in model inputs, where the descriptor epistemic is used to indicate uncertainty that derives from a lack of knowledge with respect to the appropriate values to use for various inputs to the model. The potential benefit, and hence appeal, of evidence theory is that it allows a less restrictive specification of uncertainty than is possible within the axiomatic structure on which probability theory is based. Unfortunately, the propagation of an evidence theory representation for uncertainty through a model is more computationally demanding than the propagation of a probabilistic representation for uncertainty, with this difficulty constituting a serious obstacle to the use of evidence theory in the representation of uncertainty in predictions obtained from computationally intensive models. This presentation describes and illustrates a sampling-based computational strategy for the representation of epistemic uncertainty in model predictions with evidence theory. Preliminary trials indicate that the presented strategy can be used to propagate uncertainty representations based on evidence theory in analysis situations where naive sampling-based (i.e., unsophisticated Monte Carlo) procedures are impracticable due to computational cost.

Johnson, J. D. (Prostat, Mesa, AZ); Oberkampf, William Louis; Helton, Jon Craig (Arizona State University, Tempe, AZ); Storlie, Curtis B. (North Carolina State University, Raleigh, NC)

2006-10-01

428

An Assessment of Scales Measuring Constructs in Tests of Criminological Theory Based on National Youth Survey Data  

ERIC Educational Resources Information Center

|Researchers have utilized the National Youth Survey (NYS) data to test a variety of theoretical explanations of criminal behavior. Here, the authors offer an assessment of scales used in tests of criminological theory based on NYS data. The authors conducted this assessment to provide results informing future tests of theory. Their analyses focus…

Armstrong, Todd A.; Lee, Daniel R.; Armstrong, Gaylene S.

2009-01-01

429

The research of fault diagnosis for fuel injection system of diesel engine with ANN based on rough sets theory  

Microsoft Academic Search

The core content of rough set theory is introduced, and the discrete method of continuous attribute value based on the Kohonen neural network is given. The rough set theory is used to simplify the attribute parameter reflecting operating conditions of a diesel engine, and a RBF neural network is used to realize automatic fault classification and fault diagnosis for the

Longhan Cao; Changxiu Cao; Zhen Guo; Jianyong Li

2002-01-01

430

A novel fair queuing algorithm for hybrid wired/wireless architecture with wireless compensation to provide end-to-end quality of service support  

NASA Astrophysics Data System (ADS)

We proposed novel hybrid FSO/RF architecture1 to provide broadband wireless access to end users. To provide quality of service (QoS) bounds for different types of traffic(voice, video and data) we proposed some fair queuing algorithms2,3 ,but because of the hybrid wired and wireless links there can be certain times allocated to a host when that host is unable to transmit data because of wireless link errors. These wireless link errors are location dependent and bursty. The channel errors can occur from multi-path fading, shadow fading or interference from another device. In this paper we proposed a novel fair queuing algorithm to provide end to end QoS bounds to the end users for the proposed architecture .The algorithm provide QoS bounds for Ethernet traffic in the wired domain as well as in wireless domain with compensation for wireless link errors. Scheduler maps priorities and weights for QoS of the Ethernet traffic into wireless MAC. By supporting existing Ethernet traffic QoS parameters 4-7, scheduler avoids the need to redefine QoS parameters for wireless channel. By simulations and analysis we proved that the algorithm guarantees (1) delay and throughput for error-free flows, (2) short term fairness among error-free flows, (3) long term fairness among errored and error-free flows,(4) graceful degradation for leading flows and graceful compensation for lagging flows. Each connection QoS is guaranteed by calculating bounds on delay and reserving the Bandwidth (BW).

Sana, Ajaz; Ye, Xin; Hussain, Shahab; Ali, Mohammed A.; Ahmed, Samir

2007-09-01

431

Impact of an evidence-based medicine curriculum based on adult learning theory  

Microsoft Academic Search

Objective  To develop and implement an evidence-based medicine (EBM) curriculum and determine its effectiveness in improving residents’\\u000a EBM behaviors and skills.\\u000a \\u000a \\u000a \\u000a Design  Description of the curriculum and a multifaceted evaluation, including a pretest-posttest controlled trial.\\u000a \\u000a \\u000a \\u000a Setting  University-based primary care internal medicine residency program.\\u000a \\u000a \\u000a \\u000a Participants  Second-and third-year internal medicine residents (N=34).\\u000a \\u000a \\u000a \\u000a Interventions  A 7-week EBM curriculum in which residents work through the steps of evidence-based decisions

Michael L. Green; Peter J. Ellis

1997-01-01

432

STRUCTURED PERFORMANCE MODELING AND ANALYSIS FOR OBJECT BASED DISTRIBUTED SOFTWARE SYSTEMS  

Microsoft Academic Search

In this paper, we address the problems related to the performance modeling of object based software systems, distributed across multiple platforms. Classical flat queuing models seem to be inappropriate, because of the inevitable complexity caused by the platform heterogeneity and the dual client\\/server role that objects often play in their interactions. Models should be structured vertically, in hierarchical levels, as

P. Katsaros; C. Lazos

2002-01-01

433

Volume Averaging Theory (VAT) based modeling and closure evaluation for fin-and-tube heat exchangers  

NASA Astrophysics Data System (ADS)

A fin-and-tube heat exchanger was modeled based on Volume Averaging Theory (VAT) in such a way that the details of the original structure was replaced by their averaged counterparts, so that the VAT based governing equations can be efficiently solved for a wide range of parameters. To complete the VAT based model, proper closure is needed, which is related to a local friction factor and a heat transfer coefficient of a Representative Elementary Volume (REV). The terms in the closure expressions are complex and sometimes relating experimental data to the closure terms is difficult. In this work we use CFD to evaluate the rigorously derived closure terms over one of the selected REVs. The objective is to show how heat exchangers can be modeled as a porous media and how CFD can be used in place of a detailed, often formidable, experimental effort to obtain closure for the model.

Zhou, Feng; Catton, Ivan

2012-10-01

434

An efficient FE model based on combined theory for the analysis of soft core sandwich plate  

NASA Astrophysics Data System (ADS)

An efficient C0 continuous finite element (FE) model is developed based on combined theory (refine higher order shear deformation theory (RHSDT) and least square error (LSE) method) for the static analysis of soft core sandwich plate. In this (RHSDT) theory, the in-plane displacement field for the face sheets and the core is obtained by superposing a global cubically varying displacement field on a zig-zag linearly varying displacement field with a different slope in each layer. The transverse displacement assumes to have a quadratic variation within the core and it remains constant in the faces beyond the core. The proposed model satisfies the condition of transverse shear stress continuity at the layer interfaces and the zero transverse shear stress condition at the top and bottom of the sandwich plate. The nodal field variables are chosen in an efficient manner to circumvent the problem of C1 continuity requirement of the transverse displacements. In order to calculate the accurate through thickness transverse stresses variation, LSE method has been used at the post processing stage. The proposed combine model (RHSDT and LSE) is implemented to analyze the laminated composites and sandwich plates. Many new results are also presented which should be useful for future research.

Khandelwal, Ravi Prakash; Chakrabarti, Anupam; Bhargava, Pradeep

2013-05-01

435

Building a multiple modality, theory-based physical activity intervention: The development of CardiACTION!  

PubMed Central

Objectives Despite the widely acknowledged benefits of regular physical activity (PA), specific goals for increased population levels of PA, and strongly recommended strategies to promote PA, there is no evidence suggesting that the prevalence of PA is improving. If PA intervention research is to be improved, theory should be used as the basis for intervention development, participant context or environment should be considered in the process, and intervention characteristics that will heighten the likelihood of translation into practice should be implemented (e.g., ease of implementation, low human resource costs). The purpose of this paper is to describe the implementation of the aforementioned concepts within the intervention development process associated with CardiACTION an ongoing randomized 2 × 2 factorial trial. Methods The Ecological Model of Physical Activity integrated with Protection Motivation Theory was used to inform the design of the interventions. This integrated model was selected to allow for the development of theory-based individual, environmental, and individually + environmentally targeted physical activity interventions. All intervention strategies were matched to proposed mediators of behavior change. Strategies were then matched to the most appropriate interactive technology (i.e., interactive computer session, automated telephone counseling, and tailored mailings) delivery channel. Conclusions The potential implications of this study include determining the independent and combined influence of individual and environment mechanisms of behavior change on intervention effectiveness. In addition, all intervention models are developed to be scalable and disseminable to a broad audience at a low cost.

Estabrooks, Paul A.; Glasgow, Russ E.; Xu, Stan; Dzewaltowski, David A.; Lee, Rebecca E.; Thomas, Deborah; Almeida, Fabio A.; Thayer, Amy N.; Smith-Ray, Renae L.

2010-01-01

436

Building a multiple modality, theory-based physical activity intervention: The development of CardiACTION!  

PubMed

OBJECTIVES: Despite the widely acknowledged benefits of regular physical activity (PA), specific goals for increased population levels of PA, and strongly recommended strategies to promote PA, there is no evidence suggesting that the prevalence of PA is improving. If PA intervention research is to be improved, theory should be used as the basis for intervention development, participant context or environment should be considered in the process, and intervention characteristics that will heighten the likelihood of translation into practice should be implemented (e.g., ease of implementation, low human resource costs). The purpose of this paper is to describe the implementation of the aforementioned concepts within the intervention development process associated with CardiACTION an ongoing randomized 2 × 2 factorial trial. METHODS: The Ecological Model of Physical Activity integrated with Protection Motivation Theory was used to inform the design of the interventions. This integrated model was selected to allow for the development of theory-based individual, environmental, and individually + environmentally targeted physical activity interventions. All intervention strategies were matched to proposed mediators of behavior change. Strategies were then matched to the most appropriate interactive technology (i.e., interactive computer session, automated telephone counseling, and tailored mailings) delivery channel. CONCLUSIONS: The potential implications of this study include determining the independent and combined influence of individual and environment mechanisms of behavior change on intervention effectiveness. In addition, all intervention models are developed to be scalable and disseminable to a broad audience at a low cost. PMID:22473308

Estabrooks, Paul A; Glasgow, Russ E; Xu, Stan; Dzewaltowski, David A; Lee, Rebecca E; Thomas, Deborah; Almeida, Fabio A; Thayer, Amy N; Smith-Ray, Renae L

2011-01-01

437

A Feature Extraction Method Based on Information Theory for Fault Diagnosis of Reciprocating Machinery  

PubMed Central

This paper proposes a feature extraction method based on information theory for fault diagnosis of reciprocating machinery. A method to obtain symptom parameter waves is defined in the time domain using the vibration signals, and an information wave is presented based on information theory, using the symptom parameter waves. A new way to determine the difference spectrum of envelope information waves is also derived, by which the feature spectrum can be extracted clearly and machine faults can be effectively differentiated. This paper also compares the proposed method with the conventional Hilbert-transform-based envelope detection and with a wavelet analysis technique. Practical examples of diagnosis for a rolling element bearing used in a diesel engine are provided to verify the effectiveness of the proposed method. The verification results show that the bearing faults that typically occur in rolling element bearings, such as outer-race, inner-race, and roller defects, can be effectively identified by the proposed method, while these bearing faults are difficult to detect using either of the other techniques it was compared to.

Wang, Huaqing; Chen, Peng

2009-01-01

438

A feature extraction method based on information theory for fault diagnosis of reciprocating machinery.  

PubMed

This paper proposes a feature extraction method based on information theory for fault diagnosis of reciprocating machinery. A method to obtain symptom parameter waves is defined in the time domain using the vibration signals, and an information wave is presented based on information theory, using the symptom parameter waves. A new way to determine the difference spectrum of envelope information waves is also derived, by which the feature spectrum can be extracted clearly and machine faults can be effectively differentiated. This paper also compares the proposed method with the conventional Hilbert-transform-based envelope detection and with a wavelet analysis technique. Practical examples of diagnosis for a rolling element bearing used in a diesel engine are provided to verify the effectiveness of the proposed method. The verification results show that the bearing faults that typically occur in rolling element bearings, such as outer-race, inner-race, and roller defects, can be effectively identified by the proposed method, while these bearing faults are difficult to detect using either of the other techniques it was compared to. PMID:22574021

Wang, Huaqing; Chen, Peng

2009-04-01

439

A model of evapotranspiration based on the theory of maximum entropy production  

NASA Astrophysics Data System (ADS)

Building on a proof-of-concept study of energy balance over dry soil, a model of evapotranspiration is proposed based on the theory of maximum entropy production (MEP). The MEP formalism leads to an analytical solution of evaporation rate (latent heat flux), together with sensible and ground heat fluxes, as a function of surface soil temperature, surface humidity, and net radiation. The model covers the entire range of soil wetness from dry to saturation. The MEP model of transpiration is formulated as a special case of bare soil evaporation. Test of the MEP model using field observations indicates that the model performs well over bare soil and canopy.

Wang, Jingfeng; Bras, R. L.

2011-03-01

440

A classification framework of online learning activities: based on grounded theory  

NASA Astrophysics Data System (ADS)

The purpose of this paper is to set up a classification framework of online learning activities. Fifty-nine online learning activity cases were collected from seven disciplines. Open coding, axial coding, and selective coding were conducted according to Grounded Theory. After step-by-step validation, the classification framework consists of six core categories (Argumentation, Resource Sharing, Collaboration, Inquiry, Evaluation, and Social Network) has been set up. Further study is needed to get more insight into each category and establish effective activity-based instruction models.

Zhan, Zehui

2011-12-01

441

Evaluation of a preschool nutrition education program based on the theory of multiple intelligences.  

PubMed

This report describes the evaluation of a preschool nutrition education program based on the theory of multiple intelligences. Forty-six nutrition educators provided a series of 12 lessons to 6102 preschool-age children. The program was evaluated using a pretest/post-test design to assess differences in fruit and vegetable identification, healthy snack choices, willingness to taste foods, and eating behaviors. Subjects showed significant improvement in food identification and recognition, healthy snack identification, willingness to taste foods, and frequency of fruit, vegetable, meat, and dairy consumption. The evaluation indicates that the program was an effective approach for educating preschool children about nutrition. PMID:11953232

Cason, K L

442

Analysis of Vibrational Spectra of Pyridoxazinone Based on Density Functional Theory Calculations  

NASA Astrophysics Data System (ADS)

Solid phase FTIR and FT-Raman spectra of pyridoxazinone have been recorded in regions of 4000-50 cm-1 and 3500-100 cm-1 respectively. The spectra were interpreted by normal coordinate analysis following full structure optimizations and force field calculations based on density functional theory (DFT) using the standard B3LYP/6-31G* and B3LYP/6-311+G** method and basis set combinations. The results of the calculations are applied to simulate infrared and Raman spectra of the title compound, which showed excellent agreement with the observed spectra.

Ramasamy, R.

2013-09-01

443

Study of information hiding algorithm based on GHM and color transfer theory  

Microsoft Academic Search

Taking the feature that the energy of the image would gather and spread on four components (LL\\u000a 2, LH\\u000a 2, HL\\u000a 2 and HH\\u000a 2) in the sub-image after first-order GHM multi-wavelet-transform. And by using the color control ability of l?? color space in color transfer theory (CTT), an information hiding algorithm based on GHM-CTT is proposed. In this way,

Shuai Ren; De-Jun Mu; Tao Zhang; Wei Hu

2009-01-01

444

Unique laminar-flow stability limit based shallow-water theory  

USGS Publications Warehouse

Two approaches are generally taken in deriving the stability limit for the Froude member (Fs) for laminar sheet flow. The first approach used the Orr-Sommerfeld equation, while the second uses the cross-section-averaged equations of continuity and motion. Because both approaches are based on shallow-water theory, the values of Fs obtained from both approaches should be identical, yet in the literature they are not. This suggests that a defect exists in at least one of the two approaches. After examining the governing equations used in both approaches, one finds that the existing cross-section -averaged equation of motion is dependent on the frame of reference.

Chen, Cheng-lung

1993-01-01

445

Nonparametric method for extraction of region of interest based on information theory  

NASA Astrophysics Data System (ADS)

We propose a nonparametric method for extraction of region of interest (ROI) based on information theory. A polygonal active contour, whose energy function is defined by Jensen-Shannon divergence, is used to drive the curve to match the boundaries of the ROI. Then, our method is able to solve problems involving arbitrary probability densities for the region intensity. We use this method to extract the ROI of synthesized, aerial and natural images and compare with classical statistical snake. Experimental results demonstrate the power of the proposed extraction method for ROI.

Zhang, Xiaodong; Zhao, Jianhua; Zhang, Yu; Zhong, Kaiwen

2007-11-01

446

The Advancement of Family Therapy Theory Based on the Science of Self-Organizing Complex Systems.  

NASA Astrophysics Data System (ADS)

Problem. The purpose of this study was to review the literature which presents the latest advancements in the field of family therapy theory. Since such advancement has relied on the scientific developments in the study of autopoietic self-organizing complex systems, then the review began with an historical overview of the development of these natural scientific concepts. The study then examined how the latest scientific concepts have been integrated with family therapy practice. The document is built on the theory that individuals are living, complex, self-organizing, autopoietic systems. When individual systems interact with other individual systems (such as in family interaction, or in interaction between therapist and client), then a third system emerges, which is the relationship. It is through interaction in the relationship that transformation of an individual system can occur. Method. The historical antecedents of the field of family therapy were outlined. It was demonstrated, via literature review, that the field of family therapy has traditionally paralleled developments in the hard sciences. Further, it was demonstrated via literature review that the newest understandings of the development of individuals, family systems, and therapeutic systems also parallel recent natural science developments, namely those developments based on the science of self-organizing complex systems. Outcome. The results of the study are twofold. First, the study articulates an expanded theory of the therapist, individual, and family as autopoietic self-organizing complex systems. Second, the study provides an expanded hypothesis which concerns recommendations for future research which will further advance the latest theories of family therapy. More precisely, the expanded hypothesis suggests that qualitative research, rather than quantitative research, is the method of choice for studying the effectiveness of phenomenological therapy.

Ramsey-Kemper, Valerie Ann

1995-01-01

447

Students' personal professional theories in competence?based vocational education: the construction of personal knowledge through internalisation and socialisation  

Microsoft Academic Search

Competence?based vocational education is based on a constructivist learning paradigm, where the development of students' personal professional knowledge is emphasised. However, there is a lack of insight into how students construct their own professional knowledge and what the content and nature of personal professional knowledge is. This article elaborates the concept Personal Professional Theory (PPT): a personal knowledge base in

Harmen Schaap; Elly De Bruijn; Marieke Van der Schaaf; Paul A. Kirschner

2009-01-01

448

Learning of veterinary professionals in communities : using the theory of critically reflective work behaviour with regard to evidence based practice  

Microsoft Academic Search

Veterinary professionals are required to continue learning, and need to practice increasingly in an evidence-based manner. We investigate how continued learning takes place in communities, and explore how participation in communities might at the same time support the transition to evidence based practice. Based on social constructivist theories we assume that critically reflective work behaviour (CRWB) is essential for learning

E. de Groot

2012-01-01

449

Parameterization of homogeneous ice nucleation for cloud and climate models based on classical nucleation theory  

NASA Astrophysics Data System (ADS)

A new analytical parameterization of homogeneous ice nucleation is developed based on extended classical nucleation theory including new equations for the critical radii of the ice germs, free energies and nucleation rates as simultaneous functions of temperature and water saturation ratio. By representing these quantities as separable products of the analytical functions of temperature and supersaturation, analytical solutions are found for the integral-differential supersaturation equation and concentration of nucleated crystals. Parcel model simulations are used to illustrate the general behavior of various nucleation properties under various conditions, for justifications of the further key analytical simplifications, and for verification of the resulting parameterization. The final parameterization is based upon the values of the supersaturation that determines the current or maximum concentrations of the nucleated ice crystals. The crystal concentration is analytically expressed as a function of time and can be used for parameterization of homogeneous ice nucleation both in the models with small time steps and for substep parameterization in the models with large time steps. The crystal concentration is expressed analytically via the error functions or elementary functions and depends only on the fundamental atmospheric parameters and parameters of classical nucleation theory. The diffusion and kinetic limits of the new parameterization agree with previous semi-empirical parameterizations.

Khvorostyanov, V. I.; Curry, J. A.

2012-10-01

450

Parameterization of homogeneous ice nucleation for cloud and climate models based on classical nucleation theory  

NASA Astrophysics Data System (ADS)

A new analytical parameterization of homogeneous ice nucleation is developed based on extended classical nucleation theory including new equations for the critical radii of the ice germs, free energies and nucleation rates as the functions of the temperature and water saturation ratio simultaneously. By representing these quantities as separable products of the analytical functions of the temperature and supersaturation, analytical solutions are found for the integral-differential supersaturation equation and concentration of nucleated crystals. Parcel model simulations are used to illustrate the general behavior of various nucleation properties under various conditions, for justifications of the further key analytical simplifications, and for verification of the resulting parameterization. The final parameterization is based upon the values of the supersaturation that determines the current or maximum concentrations of the nucleated ice crystals. The crystal concentration is analytically expressed as a function of time and can be used for parameterization of homogeneous ice nucleation both in the models with small time steps and for substep parameterization in the models with large time steps. The crystal concentration is expressed analytically via the error functions or elementary functions and depends only on the fundamental atmospheric parameters and parameters of classical nucleation theory. The diffusion and kinetic limits of the new parameterization agree with previous semi-empirical parameterizations.

Khvorostyanov, V. I.; Curry, J. A.

2012-03-01

451

Fabrication of multilevel phase computer-generated hologram elements based on effective medium theory.  

PubMed

A conventional method to synthesize diffractive optical elements and computer-generated holograms (CGH's) with high diffraction efficiency relies on an increase of phase levels. To fabricate such a device, one should perform electron-beam (e-beam) lithography with multiple-dose exposures or multiple-step photolithography. Here we describe a one-step method, which is based on the effective medium theory, for the fabrication of a multilevel phase CGH. The phase modulations required in cells of a CGH are constructed by means of dividing these cells into fine (subwavelength) structures. The surface features of these fine structures control their corresponding indices, and their values can be calculated according to the effective medium theory. By proper selection of the fine structures, based on the requirements of the phase modulation of the cells, a CGH with multilevel phases is synthesized when a binary structure is relieved on the dielectric material. Then the CGH can be fabricated by direct e-beam lithography or one-step photolithography through an amplitude mask followed by an ion-etching treatment. The experimental results showed that the reconstructed wave field is in good agreement with that simulated by a computer, indicating the effectiveness of the proposed method. PMID:18349924

Yu, W; Takahara, K; Konishi, T; Yotsuya, T; Ichioka, Y

2000-07-10

452

Coding theory based models for protein translation initiation in prokaryotic organisms.  

SciTech Connect

Our research explores the feasibility of using communication theory, error control (EC) coding theory specifically, for quantitatively modeling the protein translation initiation mechanism. The messenger RNA (mRNA) of Escherichia coli K-12 is modeled as a noisy (errored), encoded signal and the ribosome as a minimum Hamming distance decoder, where the 16S ribosomal RNA (rRNA) serves as a template for generating a set of valid codewords (the codebook). We tested the E. coli based coding models on 5' untranslated leader sequences of prokaryotic organisms of varying taxonomical relation to E. coli including: Salmonella typhimurium LT2, Bacillus subtilis, and Staphylococcus aureus Mu50. The model identified regions on the 5' untranslated leader where the minimum Hamming distance values of translated mRNA sub-sequences and non-translated genomic sequences differ the most. These regions correspond to the Shine-Dalgarno domain and the non-random domain. Applying the EC coding-based models to B. subtilis, and S. aureus Mu50 yielded results similar to those for E. coli K-12. Contrary to our expectations, the behavior of S. typhimurium LT2, the more taxonomically related to E. coli, resembled that of the non-translated sequence group.

May, Elebeoba Eni; Bitzer, Donald L. (North Carolina State University, Raleigh, NC); Rosnick, David I. (North Carolina State University, Raleigh, NC); Vouk, Mladen A. (North Carolina State University, Raleigh, NC)

2003-03-01

453

Risk Assessment and Hierarchical Risk Management of Enterprises in Chemical Industrial Parks Based on Catastrophe Theory  

PubMed Central

According to risk systems theory and the characteristics of the chemical industry, an index system was established for risk assessment of enterprises in chemical industrial parks (CIPs) based on the inherent risk of the source, effectiveness of the prevention and control mechanism, and vulnerability of the receptor. A comprehensive risk assessment method based on catastrophe theory was then proposed and used to analyze the risk levels of ten major chemical enterprises in the Songmu Island CIP, China. According to the principle of equal distribution function, the chemical enterprise risk level was divided into the following five levels: 1.0 (very safe), 0.8 (safe), 0.6 (generally recognized as safe, GRAS), 0.4 (unsafe), 0.2 (very unsafe). The results revealed five enterprises (50%) with an unsafe risk level, and another five enterprises (50%) at the generally recognized as safe risk level. This method solves the multi-objective evaluation and decision-making problem. Additionally, this method involves simple calculations and provides an effective technique for risk assessment and hierarchical risk management of enterprises in CIPs.

Chen, Yu; Song, Guobao; Yang, Fenglin; Zhang, Shushen; Zhang, Yun; Liu, Zhenyu

2012-01-01

454

Massive Yang-Mills theory based on the nonlinearly realized gauge group  

SciTech Connect

We propose a subtraction scheme for a massive Yang-Mills theory realized via a nonlinear representation of the gauge group [here SU(2)]. It is based on the subtraction of the poles in D-4 of the amplitudes, in dimensional regularization, after a suitable normalization has been performed. Perturbation theory is in the number of loops, and the procedure is stable under iterative subtraction of the poles. The unphysical Goldstone bosons, the Faddeev-Popov ghosts, and the unphysical mode of the gauge field are expected to cancel out in the unitarity equation. The spontaneous symmetry breaking parameter is not a physical variable. We use the tools already tested in the nonlinear sigma model: hierarchy in the number of Goldstone boson legs and weak-power-counting property (finite number of independent divergent amplitudes at each order). It is intriguing that the model is naturally based on the symmetry SU(2){sub L} local x SU(2){sub R} global. By construction the physical amplitudes depend on the mass and on the self-coupling constant of the gauge particle and moreover on the scale parameter of the radiative corrections. The Feynman rules are in the Landau gauge.

Bettinelli, D.; Ferrari, R.; Quadri, A. [Dipartimento di Fisica, Universita degli Studi di Milano and INFN, Sezione di Milano via Celoria 16, I-20133 Milan (Italy)

2008-02-15

455

Classification of regions of solar activity based on methods of pattern recognition theory  

NASA Astrophysics Data System (ADS)

Methods for predicting manifestations of solar activity based on pattern recognition theory were developed. The logical procedure for solving problems of forecasting solar activity is similar to forecasting by the synoptic method, but it is objective and can be fully automated. The actual execution of the scheme consists of the following: the general forecasting problem is formulated as forecasting the possible evolution of an active region, while forecasting proper is reduced to successive determinations of the class to which an observed active region (AR) belongs; classification of regions is made on the basis of solving rules selected by recognition methods, and one can use different sets of base data and different algorithms at each stage of formation of the forecast. Several problems of forecasting manifestations of solar activity were solved on the basis of the algorithms developed. In conclusion, it can be stated that the methods of pattern recognition theory make it possible to obtain satisfactory results in solving problems of forecasting the manifestations of solar activity that have a direct effect on the radiation situation in near Earth space.

Avdyushin, S. I.; Berlyand, B. O.; Dernshteyn, P. B.; Burov, V. A.

1983-07-01

456

Towards a General Theory of Neural Computation Based on Prediction by Single Neurons  

Microsoft Academic Search

Although there has been tremendous progress in understanding the mechanics of the nervous system, there has not been a general theory of its computational function. Here I present a theory that relates the established biophysical properties of single generic neurons to principles of Bayesian probability theory, reinforcement learning and efficient coding. I suggest that this theory addresses the general computational

Christopher D. Fiorillo; Olaf Sporns

2008-01-01

457

The research on the product innovation intrapreneurship of SMEs—Based on Long Tail Theory  

Microsoft Academic Search

In order to promote sustainable development of SMEs in China through intrapreneurship, we have made a relatively comprehensive research in this paper. Firstly, we have reviewed the related theory about intrapreneurship and Long Tail Theory and the researches combined the two theories, and have found that Long Tail Theory provides new ideas for product innovation intrapreneurship of SMEs. Then, from

Wang Liping; Jiang Jie; Li Naiqiu; Xu Zhengzhong

2010-01-01

458

Cholesky-decomposed densities in Laplace-based second-order Møller-Plesset perturbation theory  

NASA Astrophysics Data System (ADS)

Based on our linear-scaling atomic orbital second-order Møller-Plesset perturbation theory (AO-MP2) method [J. Chem. Phys. 130, 064107 (2009)], we explore the use of Cholesky-decomposed pseudodensity (CDD) matrices within the Laplace formulation. Numerically significant contributions are preselected using our multipole-based integral estimates as upper bounds to two-electron integrals so that the 1/R6 decay behavior of transformed Coulomb-type products is exploited. In addition, we combine our new CDD-MP2 method with the resolution of the identity (RI) approach. Even though the use of RI results in a method that shows a quadratic scaling behavior in the dominant steps, gains of up to one or two orders of magnitude vs. our original AO-MP2 method are observed in particular for larger basis sets.

Zienau, Jan; Clin, Lucien; Doser, Bernd; Ochsenfeld, Christian

2009-05-01

459

Cholesky-decomposed densities in Laplace-based second-order Møller-Plesset perturbation theory.  

PubMed

Based on our linear-scaling atomic orbital second-order Møller-Plesset perturbation theory (AO-MP2) method [J. Chem. Phys. 130, 064107 (2009)], we explore the use of Cholesky-decomposed pseudodensity (CDD) matrices within the Laplace formulation. Numerically significant contributions are preselected using our multipole-based integral estimates as upper bounds to two-electron integrals so that the 1/R(6) decay behavior of transformed Coulomb-type products is exploited. In addition, we combine our new CDD-MP2 method with the resolution of the identity (RI) approach. Even though the use of RI results in a method that shows a quadratic scaling behavior in the dominant steps, gains of up to one or two orders of magnitude vs. our original AO-MP2 method are observed in particular for larger basis sets. PMID:19485442

Zienau, Jan; Clin, Lucien; Doser, Bernd; Ochsenfeld, Christian

2009-05-28

460

[Instrument to collect data for critical patients based on the theory of basic human needs].  

PubMed

This is an exploratory study based on qualitative approach that aimed to collectively construct an instrument to collect data for patients in the Intensive Care Unit (ICU), based on the Theory of Basic Human Needs (NHB). Data collection was through a focus group with four nurses from the ICU and four residents from the Nursing-Health Integrated Residency (RIS) program in seven meetings in 2009. The discussions produced in each session were analyzed as recommended by Horta. The instrument was divided into seven groups and 17 subgroups of needs. After testing and suggestions from participants, we elaborated the final version of the instrument and a guidance manualfor completing it, according to the need expressed by the group. Validation of the instrument and the manual and inclusion of teaching of the nursing process in the RIS activity program are suggested. PMID:23155590

Bordinhão, Rosaura Costa; Almeida, Miriam de Abreu

2012-06-01

461

Study on the salary system for IT enterprise based on double factor motivation theory  

NASA Astrophysics Data System (ADS)

To improve the fact that the IT enterprise's salary & compensation system can not motivate a company's staff efficiently, the salary system based on Hertzberg's double factor motivation theory and the enterprise characteristics is presented. The salary system includes a salary model, an assessment model and a performance model. The system is connected with a cash incentive based on the staff's performance and emphasizes that the salary alone is not a motivating factor. Health care, for example, may also play a positive role on the motivation factor. According to this system, a scientific and reasonable salary & compensation management system was established and applied in an IT enterprise. It was found to promote the enterprise's overall performance and competitive power.

Zhuang, Chen; Qian, Wu

2005-12-01

462

Can functionalized cucurbituril bind actinyl cations efficiently? A density functional theory based investigation.  

PubMed

The feasibility of using cucurbituril host molecule as a probable actinyl cation binders candidate is investigated through density functional theory based calculations. Various possible binding sites of the cucurbit[5]uril host molecule to uranyl are analyzed and based on the binding energy evaluations, ?(5)-binding is predicted to be favored. For this coordination, the structure, vibrational spectra, and binding energies are evaluated for the binding of three actinyls in hexa-valent and penta-valent oxidation states with functionalized cucurbiturils. Functionalizing cucurbituril with methyl and cyclohexyl groups increases the binding affinities of actinyls, whereas fluorination decreases the binding affinities as compared to the native host molecule. Surprisingly hydroxylation of the host molecule does not distinguish the oxidation state of the three actinyls. PMID:22471316

Sundararajan, Mahesh; Sinha, Vivek; Bandyopadhyay, Tusar; Ghosh, Swapan K

2012-04-20

463

Conductance of three-terminal molecular bridge based on tight-binding theory  

NASA Astrophysics Data System (ADS)

The quantum transmission characteristic of three-benzene ring nano-molecular bridge is investigated theoretically by using Green's function approach based on tight-binding theory with only a ? orbital per carbon atom at the site. The transmission probabilities that electrons transport through the molecular bridge from one terminal to the other two terminals are obtained. The electronic current distributions inside the molecular bridge are calculated and shown in graphical analogy by the current density method based on Fisher-Lee formula at the energy points E = ±0.42, ±1.06 and ±1.5, respectively, where the transmission spectra appear peaks. We find that the transmission spectra are related to the incident electronic energy and the molecular levels strongly and the current distributions agree well with Kirchhoff quantum current momentum conservation law.

Wang, Li-Guang; Li, Yong; Yu, Ding-Wen; Katsunori, Tagami; Masaru, Tsukada

2005-05-01

464

New model for the correlation of the surface tension based on friction theory.  

PubMed

A new correlation method for the surface tension of fluids is proposed, which is based on friction theory applied to the interface of a two-phase system. The substance properties enter the model by a regular equation of state. Here we derive the method and test it with the Lennard-Jones 12-6 fluid as the reference system using molecular dynamics simulations of the vapor-liquid interface in combination with a new Lennard-Jones 12-6 equation of state. Further correlations of experimental surface tension data based on the Peng-Robinson and the PC-SAFT equations of state are presented. As a result, we find that the method allows an accurate correlation of the surface tension of pure fluids. PMID:19236013

Quiñones-Cisneros, S E; Deiters, U K; Rozas, R E; Kraska, T

2009-03-19

465

Combinatorial density functional theory-based screening of surface alloys for the oxygen reduction reaction.  

SciTech Connect

A density functional theory (DFT) -based, combinatorial search for improved oxygen reduction reaction (ORR) catalysts is presented. A descriptor-based approach to estimate the ORR activity of binary surface alloys, wherein alloying occurs only in the surface layer, is described, and rigorous, potential-dependent computational tests of the stability of these alloys in aqueous, acidic environments are presented. These activity and stability criteria are applied to a database of DFT calculations on nearly 750 binary transition metal surface alloys; of these, many are predicted to be active for the ORR but, with few exceptions, they are found to be thermodynamically unstable in the acidic environments typical of low-temperature fuel cells. The results suggest that, absent other thermodynamic or kinetic mechanisms to stabilize the alloys, surface alloys are unlikely to serve as useful ORR catalysts over extended periods of operation.

Greeley, J.; Norskov, J.; Center for Nanoscale Materials; Technical Univ. of Denmark

2009-03-26

466

Multi-source remote sensing image fusion classification based on DS evidence theory  

NASA Astrophysics Data System (ADS)

A new adaptive remote sensing image fusion classification based on the Dempster-Shafer theory of evidence is presented. This method uses a limited number of prototypes as items of evidence, which is automatically generated by modified Fuzzy Kohonen Clustering Network (FKCN). The class fuzzy membership of each prototype is also determined using reference pattern set. For each input vector a basic probability assignment (BPA) function are computed based on these distances and on the degree of membership of prototypes to each class. And lastly this evidence is combined using Dempster's rule. This proposed method can be implemented in a modified FKCN with specific architecture consisting of one input layer, a prototype layer, a BPA layer, a combination and output layer, and decision layer. The experimental results show that the excellent performance of classification as compared to existing FKCN and basic DS fusion techniques.

Liu, Chunping; Ma, Xiaohu; Cui, Zhiming

2007-11-01

467

The Psychobiological Model: Towards a New Theory of Computer-Mediated Communication Based on Darwinian Evolution  

Microsoft Academic Search

his article reviews theories of organizational communication with a special emphasis on theories that have been used to explain computer-mediated communication phenomena. Among the theories reviewed, two—social presence and media richness—are identified as problematic and as posing obstacles to future theoretical development. While shortcomings of these theories have been identified in the past, some of these theories' predictions have been

Ned Kock

2004-01-01

468

Coverage theories for metagenomic DNA sequencing based on a generalization of Stevens' theorem.  

PubMed

Metagenomic project design has relied variously upon speculation, semi-empirical and ad hoc heuristic models, and elementary extensions of single-sample Lander-Waterman expectation theory, all of which are demonstrably inadequate. Here, we propose an approach based upon a generalization of Stevens' Theorem for randomly covering a domain. We extend this result to account for the presence of multiple species, from which are derived useful probabilities for fully recovering a particular target microbe of interest and for average contig length. These show improved specificities compared to older measures and recommend deeper data generation than the levels chosen by some early studies, supporting the view that poor assemblies were due at least somewhat to insufficient data. We assess predictions empirically by generating roughly 4.5 Gb of sequence from a twelve member bacterial community, comparing coverage for two particular members, Selenomonas artemidis and Enterococcus faecium, which are the least ([Formula: see text]3 %) and most ([Formula: see text]12 %) abundant species, respectively. Agreement is reasonable, with differences likely attributable to coverage biases. We show that, in some cases, bias is simple in the sense that a small reduction in read length to simulate less efficient covering brings data and theory into essentially complete accord. Finally, we describe two applications of the theory. One plots coverage probability over the relevant parameter space, constructing essentially a "metagenomic design map" to enable straightforward analysis and design of future projects. The other gives an overview of the data requirements for various types of sequencing milestones, including a desired number of contact reads and contig length, for detection of a rare viral species. PMID:22965653

Wendl, Michael C; Kota, Karthik; Weinstock, George M; Mitreva, Makedonka

2012-09-11

469

Hydrogen bonding and stacking interactions of nucleic acid base pairs: A density-functional-theory based treatment  

NASA Astrophysics Data System (ADS)

We extend an approximate density functional theory (DFT) method for the description of long-range dispersive interactions which are normally neglected by construction, irrespective of the correlation function applied. An empirical formula, consisting of an R-6 term is introduced, which is appropriately damped for short distances; the corresponding C6 coefficient, which is calculated from experimental atomic polarizabilities, can be consistently added to the total energy expression of the method. We apply this approximate DFT plus dispersion energy method to describe the hydrogen bonding and stacking interactions of nucleic acid base pairs. Comparison to MP2/6-31G*(0.25) results shows that the method is capable of reproducing hydrogen bonding as well as the vertical and twist dependence of the interaction energy very accurately.

Elstner, Marcus; Hobza, Pavel; Frauenheim, Thomas; Suhai, Sándor; Kaxiras, Efthimios

2001-03-01

470

Investigations into Generalization of Constraint-Based Scheduling Theories with Applications to Space Telescope Observation Scheduling  

NASA Astrophysics Data System (ADS)

This final report summarizes research performed under NASA contract NCC 2-531 toward generalization of constraint-based scheduling theories and techniques for application to space telescope observation scheduling problems. Our work into theories and techniques for solution of this class of problems has led to the development of the Heuristic Scheduling Testbed System (HSTS), a software system for integrated planning and scheduling. Within HSTS, planning and scheduling are treated as two complementary aspects of the more general process of constructing a feasible set of behaviors of a target system. We have validated the HSTS approach by applying it to the generation of observation schedules for the Hubble Space Telescope. This report summarizes the HSTS framework and its application to the Hubble Space Telescope domain. First, the HSTS software architecture is described, indicating (1) how the structure and dynamics of a system is modeled in HSTS, (2) how schedules are represented at multiple levels of abstraction, and (3) the problem solving machinery that is provided. Next, the specific scheduler developed within this software architecture for detailed management of Hubble Space Telescope operations is presented. Finally, experimental performance results are given that confirm the utility and practicality of the approach.

Muscettola, Nicola; Smith, Steven S.

1996-09-01

471

Optical surface measurement using phase retrieval hybrid algorithm based on diffraction angular spectrum theory  

NASA Astrophysics Data System (ADS)

In order to test the high dynamic range error beyond one wavelength after the rough polish process, we design a phase retrieval hybrid algorithm based on diffraction angular spectrum theory. Phase retrieval is a wave front sensing method that uses the intensity distribution to reconstruct the phase distribution of optical field. Phase retrieval is established on the model of diffractive propagation and approach the real intensity distribution gradually. In this paper, we introduce the basic principle and challenges of optical surface measurement using phase retrieval, then discuss the major parts of phase retrieval: diffractive propagation and hybrid algorithm. The angular spectrum theory describes the diffractive propagation in the frequency domain instead of spatial domain, which simplifies the computation greatly. Through the theoretical analysis, the angular spectrum in discrete form is more effective when the high frequency part values less and the diffractive distance isn't far. The phase retrieval hybrid algorithm derives from modified GS algorithm and conjugate gradient method, aiming to solve the problem of phase wrapping caused by the high dynamic range error. In the algorithm, phase distribution is described by Zernike polynomials and the coefficients of Zernike polynomials are optimized by the hybrid algorithm. Simulation results show that the retrieved phase distribution and real phase distribution are quite contiguous for the high dynamic range error beyond ?.

Feng, Liang; Zeng, Zhi-ge; Wu, Yong-qian

2013-08-01

472

Theory analysis of mode coupling in tilted long period fiber grating based on the full vector complex coupled mode theory  

NASA Astrophysics Data System (ADS)

The mode coupling in the tilted long period fiber grating (TLPG) is analyzed by using the full vector complex coupled mode theory (FV-CCMT). Compared with the non-tilted LPG, new resonance bands corresponding to the LP1m cladding modes are observed in the transmission spectrum of the TLPG. The coupling to LP1m cladding modes is the combination of the coupling to degenerate vector modes TE0m, TM0m and HE2m with different propagation constants. The maximum coupling between LP01 and LP1m modes occurs at a tilt angle of ˜87°. Numerical results show that the state of polarization (SOP) of the input light would induce the shift of the new resonance wavelength. Also, the RI sensitivity of the new resonance wavelength is much higher than that of the normal resonance wavelength corresponding to the LP0m cladding modes. Such TLPG would find application in chemical and biological sensing fields.

Yin, Guolu; Lou, Shuqin; Li, Qi; Zou, Hui

2013-06-01

473

The role of cyber-intermediaries: a framework based on transaction cost analysis, agency, relationship marketing and social exchange theories  

Microsoft Academic Search

Purpose – The purpose of his paper is to define the role of cyber-intermediaries based on several theories such as transaction cost analysis, agency, social exchange, and relationship marketing. Design\\/methodology\\/approach – This is a conceptual piece that uses arguments from well-established theories in marketing and management Findings – This paper suggests that cyber-intermediaries will continue to add value to the

Xueming Luo; Naveen Donthu

2007-01-01

474

An ordinal optimization theory-based algorithm for solving the optimal power flow problem with discrete control variables  

Microsoft Academic Search

The optimal power flow (OPF) problem with discrete control variables is an NP-hard problem in its exact formulation. To cope with the immense computational-difficulty of this problem, we propose an ordinal optimization theory-based algorithm to solve for a good enough solution with high probability. Aiming for hard optimization problems, the ordinal optimization theory, in contrast to heuristic methods, guarantee to

Shin-Yeu Lin; Yu-Chi Ho; Ch'i-Hsin Lin

2004-01-01

475

RCR online course: build an online course to augment RCR training using evidenced-based learning theory.  

PubMed

This article demonstrates how to apply evidenced-based instructional design principles to develop a supplemental, online Responsible Conduct of Research (RCR) course. The supplement RCR course may serve to appropriately augment the National Institutes of Health (NIH) required RCR training. The way to ensure that an online RCR course is effective is to incorporate evidence-based learning theories into the development of the course content. This article specifically demonstrates application of Bloom's taxonomy and Gagne's Nine Instructional Events to a research misconduct course. At the conclusion, the reader will be able to apply evidence-based learning theories to the development of any online course. PMID:22861181

Ratliff, Mary; Masen, Nicole; Sullivan, Stephen; Fleming, Michael F; Carney, Paula

2012-01-01

476

Application of perturbation theory to lattice calculations based on method of cyclic characteristics  

NASA Astrophysics Data System (ADS)

Perturbation theory is a technique used for the estimation of changes in performance functionals, such as linear reaction rate ratio and eigenvalue affected by small variations in reactor core compositions. Here the algorithm of perturbation theory is developed for the multigroup integral neutron transport problems in 2D fuel assemblies with isotropic scattering. The integral transport equation is used in the perturbative formulation because it represents the interconnecting neutronic systems of the lattice assemblies via the tracking lines. When the integral neutron transport equation is used in the formulation, one needs to solve the resulting integral transport equations for the flux importance and generalized flux importance functions. The relationship between the generalized flux importance and generalized source importance functions is defined in order to transform the generalized flux importance transport equations into the integro-differential equations for the generalized adjoints. Next we develop the adjoint and generalized adjoint transport solution algorithms based on the method of cyclic characteristics (MOCC) in DRAGON code. In the MOCC method, the adjoint characteristics equations associated with a cyclic tracking line are formulated in such a way that a closed form for the adjoint angular function can be obtained. The MOCC method then requires only one cycle of scanning over the cyclic tracking lines in each spatial iteration. We also show that the source importance function by CP method is mathematically equivalent to the adjoint function by MOCC method. In order to speed up the MOCC solution algorithm, a group-reduction and group-splitting techniques based on the structure of the adjoint scattering matrix are implemented. A combined forward flux/adjoint function iteration scheme, based on the group-splitting technique and the common use of a large number of variables storing tracking-line data and exponential values, is proposed to reduce the computing time when both direct and adjoint solutions are required. A problem that arises for the generalized adjoint problem is that the direct use of the negative external generalized adjoint sources in the adjoint solution algorithm results in negative generalized adjoint functions. A coupled flux biasing/decontamination scheme is applied to make the generalized adjoint functions positive using the adjoint functions in such a way that it can be used for the multigroup rebalance technique. Next we consider the application of the perturbation theory to the reactor problems. Since the coolant void reactivity (CVR) is a important factor in reactor safety analysis, we have decided to select this parameter for optimization studies. We consider the optimization and adjoint sensitivity techniques for the adjustments of CVR at beginning of burnup cycle (BOC) and k eff at end of burnup cycle (EOC) for a 2D Advanced CANDU Reactor (ACR) lattice. The sensitivity coefficients are evaluated using the perturbation theory based on the integral transport equations. Three sets of parameters for CVR-BOC and keff-EOC adjustments are studied: (1) Dysprosium density in the central pin with Uranium enrichment in the outer fuel rings, (2) Dysprosium density and Uranium enrichment both in the central pin, and (3) the same parameters as in the first case but the objective is to obtain a negative checkerboard CVR at beginning of cycle (CBCVR-BOC). To approximate the sensitivity coefficient at EOC, we perform constant-power burnup/depletion calculations for 600 full power days (FPD) using a slightly perturbed nuclear library and the unperturbed neutron fluxes to estimate the variation of nuclide densities at EOC. Sensitivity analyses of CVR and eigenvalue are included in the study. In addition the optimization and adjoint sensitivity techniques are applied to the CBCVR-BOC and keff-EOC adjustment of the ACR lattices with Gadolinium in the central pin. Finally we apply these techniques to the CVR-BOC, CVR-EOC and keff-EOC adjustment of a CANDU lattice of which the burnup period is extended f

Assawaroongruengchot, Monchai

477

Calculation of solid-liquid interfacial free energy: a classical nucleation theory based approach.  

PubMed

We present a simple approach to calculate the solid-liquid interfacial free energy. This new method is based on the classical nucleation theory. Using the molecular dynamics simulation, we employ spherical crystal nuclei embedded in the supercooled liquids to create an ideal model of a homogeneous nucleation. The interfacial free energy is extracted by fitting the relation between the critical nucleus size and the reciprocal of the critical undercooling temperature. The orientationally averaged interfacial free energy is found to be 0.302+/-0.002 (in standard LJ unit). The temperature dependence of the interfacial free energy is also obtained in this work. We find that the interfacial free energy increases slightly with increasing temperature. The positive temperature coefficient of the interfacial free energy is in qualitative agreement with Spaepen's analysis [Solid State Phys. 47, FS181 (1994)] and Turnbull's empirical estimation [J. Appl. Phys. 21, 1022 (1950)]. PMID:16599718

Bai, Xian-Ming; Li, Mo

2006-03-28

478

Density functional theory based study of graphene and dielectric oxide interfaces.  

PubMed

We study the effects of insulating oxides in their crystalline forms on the energy band structure of monolayer and bilayer graphene using a first principles density functional theory based electronic structure method and a local density approximation. We consider the dielectric oxides SiO(2) (?-quartz) and Al(2)O(3) (alumina or ?-sapphire), each with two surface terminations. Our study suggests that atomic relaxations and resulting equilibrium separations play a critical role in perturbing the linear band structure of graphene in contrast to the less critical role played by dangling bonds that result from cleaving the crystal in a particular direction. For Si-terminated quartz a Dirac cone is retained while it is restored on adding a second graphene layer for O-terminated quartz. Alumina needs more than two graphene layers to preserve the Dirac cone. Our results are, at best, semi-quantitative for the common amorphous forms of the oxides considered. PMID:22119858

Jadaun, Priyamvada; Banerjee, Sanjay K; Register, Leonard F; Sahu, Bhagawan

2011-11-28

479

Multiresolution Quantum Chemistry in Multiwavelet Bases: Analytic Derivatives for Hartree-Fock and Density Functional Theory  

SciTech Connect

An efficient and accurate analytic gradient method is presented for Hartree-Fock and density functional calculations using multiresolution analysis in multiwavelet bases. The derivative is efficiently computed as an inner product between compressed forms of the density and the differentiated nuclear potential through the Hellmann-Feynman theorem. A smoothed nuclear potential is directly differentiated, and the smoothing parameter required for a given accuracy is empirically determined from calculations on six homonuclear diatomic molecules. The derivatives of N-2 molecule are shown using multiresolution calculation for various accuracies with comparison to correlation consistent Gaussian-type basis sets. The optimized geometries of several molecules are presented using Hartree-Fock and density functional theory. A highly precise Hartree-Fock optimization for the H2O molecule produced six digits for the geometric parameters. (C) 2004 American Institute of Physics.

Yanai, Takeshi; Fann, George; gan, zhengting; Harrison, Robert J.

2004-08-15

480

Suicide prevention by online support groups: an action theory-based model of emotional first aid.  

PubMed

In the last two decades, online support groups have become a valuable source of help for individuals in suicidal crisis. Their attractiveness is attributed to features that enhance help-seeking and self-disclosure such as availability, anonymity, and use of written communication. However, online support groups also suffer from limitations and potential risks as agents of suicide prevention. The Israeli Association for Emotional First Aid (ERAN) has developed a practical model that seeks to maximize the benefits and minimize the risks of online suicide prevention. The model applies the Action Theory concepts whereby individuals shape their own environment. The present paper presents the model, which is based on an online support group combined with personal chat and a telephonic help line. The online support group is moderated by paraprofessionals who function as both process regulators and support providers. The principles and practice of the model are described, the theoretical rationale is presented, and directions for future research are suggested. PMID:19123109

Gilat, Itzhak; Shahar, Golan

2009-01-01

481

The Study and Design of Adaptive Learning System Based on Fuzzy Set Theory  

NASA Astrophysics Data System (ADS)

Adaptive learning is an effective way to improve the learning outcomes, that is, the selection of learning content and presentation should be adapted to each learner's learning context, learning levels and learning ability. Adaptive Learning System (ALS) can provide effective support for adaptive learning. This paper proposes a new ALS based on fuzzy set theory. It can effectively estimate the learner's knowledge level by test according to learner's target. Then take the factors of learner's cognitive ability and preference into consideration to achieve self-organization and push plan of knowledge. This paper focuses on the design and implementation of domain model and user model in ALS. Experiments confirmed that the system providing adaptive content can effectively help learners to memory the content and improve their comprehension.

Jia, Bing; Zhong, Shaochun; Zheng, Tianyang; Liu, Zhiyong

482

Applying constructivist theory to practice in a technology-based learning environment  

NASA Astrophysics Data System (ADS)

This paper describes a research study where constructivism was used as the rationale for the design, implementation and evaluation of four technology-based investigations for Year 12 Applicable Mathematics students. Analysis is given of the successes and difficulties encountered by students and teachers of four classes, including my own, in which the investigations were implemented. The results showed that, for learning activities involving school assessment, many students chose not to work collaboratively — a strategy suggested by social constructivism. The extent to which this may have been detrimental to their learning is discussed. The study illustrates how engaging in research can be a means for teachers to understand theory. In particular, the paper describes the meaning made of constructivism through this example of teaching practice and research activity.

Forster, Patricia

1999-09-01

483

Nonlinear diffusion in two-dimensional ordered porous media based on a free volume theory.  

PubMed

A continuum nonlinear diffusion model is developed to describe molecular transport in ordered porous media. An existing generic van der Waals equation of state based free volume theory of binary diffusion coefficients is modified and introduced into the two-dimensional diffusion equation. The resulting diffusion equation is solved numerically with the alternating-direction fully implicit method under Neumann boundary conditions. Two types of pore structure symmetries are considered, hexagonal and cubic. The former is modeled as parallel channels while in case of the latter equal-sized channels are placed perpendicularly thus creating an interconnected network. First, general features of transport in both systems are explored, followed by the analysis of the impact of molecular properties on diffusion inside and out of the porous matrix. The influence of pore size on the diffusion-controlled release kinetics is assessed and the findings used to comment recent experimental studies of drug release profiles from ordered mesoporous silicates. PMID:20025313

Godec, A; Gaberscek, M; Jamnik, J; Merzel, F

2009-12-21

484

Lift and Drag Prediction in Supersonic Region Based on Momentum Conservation Theory  

NASA Astrophysics Data System (ADS)

Recently, as advanced drag prediction method in transonic region, a drag decomposition method is watched with keen interest. This method is based on and extended from the momentum conservation theory on the closed integral surface around the airplane, which is usually called ‘Control Volume Method’ (CVM). In this paper, aiming the next target which is the drag decomposition in supersonic flows, the validation study of the CVM in the supersonic region was conducted. Two dimensional structured mesh computation of NACA0012 airfoil was used for the investigation. At the lift and drag prediction using the CVM in the supersonic region, the discontinuous variation or oscillation of the lift and drag value was observed when the integral surface was set to some particular positions related to the generated shock waves. By the avoidance of the inappropriate positions, however, the good performance of the lift and drag prediction using CVM was achieved.

Yamazaki, Wataru; Kusunose, Kazuhiro; Matsushima, Kisa; Nakahashi, Kazuhiro

485

Digital focusing of OCT images based on scalar diffraction theory and information entropy  

PubMed Central

This paper describes a digital method that is capable of automatically focusing optical coherence tomography (OCT) en face images without prior knowledge of the point spread function of the imaging system. The method utilizes a scalar diffraction model to simulate wave propagation from out-of-focus scatter to the focal plane, from which the propagation distance between the out-of-focus plane and the focal plane is determined automatically via an image-definition-evaluation criterion based on information entropy theory. By use of the proposed approach, we demonstrate that the lateral resolution close to that at the focal plane can be recovered from the imaging planes outside the depth of field region with minimal loss of resolution. Fresh onion tissues and mouse fat tissues are used in the experiments to show the performance of the proposed method.

Liu, Guozhong; Zhi, Zhongwei; Wang, Ruikang K.

2012-01-01

486

Z curve theory-based analysis of the dynamic nature of nucleosome positioning in Saccharomyces cerevisiae.  

PubMed

Nucleosome is the elementary structural unit of eukaryotic chromatin. Instability of nucleosome positioning plays critical roles in chromatin remodeling in differentiation and disease. In this study, we investigated nucleosome dynamics in the Saccharomyces cerevisiae genome using a geometric model based on Z curve theory. We identified 52,941 stable nucleosomes and 7607 dynamic nucleosomes, compiling them into a genome-wide nucleosome dynamic positioning map and constructing a user-friendly visualization platform (http://bioinfo.hrbmu.edu.cn/nucleosome). Our approach achieved a sensitivity of 90.31% and a specificity of 87.76% for S. cerevisiae. Analysis revealed transcription factor binding sites (TFBSs) were enriched in linkers. And among the sparse nucleosomes around TFBSs, dynamic nucleosomes were slightly preferred. Gene Ontology (GO) enrichment analysis indicated that stable and dynamic nucleosomes were enriched on genes involved in different biological processes and functions. This study provides an approach for comprehending chromatin remodeling and transcriptional regulation of genes. PMID:23958656

Wu, Xueting; Liu, Hui; Liu, Hongbo; Su, Jianzhong; Lv, Jie; Cui, Ying; Wang, Fang; Zhang, Yan

2013-08-16

487

A theory-based model for teaching and assessing residents in the operating room.  

PubMed

The operating room (OR) remains primarily a master/apprenticeship-based learning environment for surgical residents. Changes in surgical education and health care systems challenge faculty to efficiently and effectively graduate residents truly competent in operations classified by the Surgical Council on Resident Education as "common essential" and "uncommon essential." Program directors are charged with employing resident evaluation systems that yield useful data, yet feasible enough to fit into a busy surgical faculty member's workflow. This paper proposes a simple model for teaching and assessing residents in the operating room to guide faculty and resident interaction in the OR, and designating a resident's earned level of autonomy for a given procedure. The system as proposed is supported by theories associated with motor skill acquisition and learning. PMID:23337666

DaRosa, Debra A; Zwischenberger, Joseph B; Meyerson, Shari L; George, Brian C; Teitelbaum, Ezra N; Soper, Nathaniel J; Fryer, Jonathan P

2012-08-28

488

Expert system for heart function based on artificial neural networks and fuzzy theory  

NASA Astrophysics Data System (ADS)

In this paper, a computer-aided diagnosis system for heart function based on artificial neural networks and fuzzy logic is introduced. Typical parameters reflecting heart function, provided by echocardiography, were used as input of neural networks and their corresponding heart functions as output. To obtain an analytic and discrimination model closer to brain, we combined fuzzy theory with neural network technology, and input parameters are fuzzily treated. During distinguishing morbid style, we used fuzzy interval, fuzzy number and its related possibility distribution concepts, and selected appropriate operator, and so get its corresponding membership, meanwhile membership was put out of interval of linguistic to consist with language expression. The network selected was BP, and back- propagation algorithm was used to train the network. After studying the result evaluated by expert, the neural network was used to appreciate 150 testees' heart function, of which 90.7% was consistent with experts' diagnosis.

Yu, Wei; Li, Xiaoying; Yu, Daoyin; Mao, Yi; Hua, Qi

1998-09-01

489

Reconstruction of middle-third auricular defect based on aesthetic perception theory  

Microsoft Academic Search

The perception theory has been recently used in aesthetic reconstructive surgery. Using on the principles of the theory, we have successfully reconstructed an ear with a middle-third defect utilizing local flap and secondary revision procedures.

Yean-Lu Chang; Yu-Ray Chen; M. Samuel Noordhoff

1990-01-01

490

The ?3 model of acids and bases: extending the Lewis theory to intermetallics.  

PubMed

A central challenge in the design of new metallic materials is the elucidation of the chemical factors underlying the structures of intermetallic compounds. Analogies to molecular bonding phenomena, such as the Zintl concept, have proven very productive in approaching this goal. In this Article, we extend a foundational concept of molecular chemistry to intermetallics: the Lewis theory of acids and bases. The connection is developed through the method of moments, as applied to DFT-calibrated Hückel calculations. We begin by illustrating that the third and fourth moments (?(3) and ?(4)) of the electronic density of states (DOS) distribution tune the properties of a pseudogap. ?(3) controls the balance of states above and below the DOS minimum, with ?(4) then determining the minimum's depth. In this way, ?(3) predicts an ideal occupancy for the DOS distribution. The ?(3)-ideal electron count is used to forge a link between the reactivity of transition metals toward intermetallic phase formation, and that of Lewis acids and bases toward adduct formation. This is accomplished through a moments-based definition of acidity which classifies systems that are electron-poor relative to the ?(3)-ideal as ?(3)-acidic, and those that are electron-rich as ?(3)-basic. The reaction of ?(3) acids and bases, whether in the formation of a Lewis acid/base adduct or an intermetallic phase, tends to neutralize the ?(3) acidity or basicity of the reactants. This ?(3)-neutralization is traced to the influence of electronegativity differences at heteroatomic contacts on the projected DOS curves of the atoms involved. The role of ?(3)-acid/base interactions in intermetallic phases is demonstrated through the examination of 23 binary phases forming between 3d metals, the stability range of the CsCl type, and structural trends within the Ti-Ni system. PMID:22420716

Stacey, Timothy E; Fredrickson, Daniel C

2012-03-15

491

Developing the therapeutic potential of embodied cognition and metaphors in nature-based therapy: lessons from theory to practice  

Microsoft Academic Search

This paper theoretically examines the interplay between cognition and bodily involvement in relation to nature-based therapy and proposes implications for practice. With support from theory within embodied cognition and neuroscientific studies, it is argued that explicit learning is actively supported by bodily involvement with the environment. This argument is placed in the context of ‘nature-based therapy’, which can be perceived

Sus S. Corazon; Theresa S. S. Schilhab; Ulrika K. Stigsdotter

2011-01-01

492

The Delivery of Video-Based Performance Analysis by England Youth Soccer Coaches: Towards a Grounded Theory  

Microsoft Academic Search

The purpose of this study was to build a theoretical framework to understand the delivery of video-based performance analysis by youth soccer coaches in England. Data were collected from interviews with 14 English youth soccer coaches, who had used video-based performance analysis for more than 3 years in their coaching practice. Using a grounded theory methodology (Strauss & Corbin, 1998),

Ryan Groom; Christopher Cushion; Lee Nelson

2011-01-01

493

Selection of gas sensing materials using the Hard Soft Acid Base theory; application to Surface Acoustic Wave CO2 detection  

Microsoft Academic Search

The Hard Soft Acid Base (HSAB) theory is introduced as a new tool to select or design sensitive materials for carbon dioxide detection with SAW-BAW (Surface Acoustic Waves - Bulk Acoustic Waves) devices. According to HSAB, CO2 is hard acid, thus small organic or inorganic molecules, or polymers which can act as hard bases could be suitable candidates as sensing

B. Serban; A. K. Sarin Kumar; C. Cobianu; O. Buiu; S. Costea; C. Bostan; N. Varachiu

2010-01-01

494

Spectroscopic and density functional theory investigation of novel Schiff base complexes.  

PubMed

Novel Schiff base (H(2)L, 1,2-bis[(2-(2-mercaptophenylimino)methyl)phenoxy] ethane) derived from condensation of bisaldehyde and 2-aminothiophenol was prepared in a molar ratio 1:2. The ligand and its metal complexes are fully characterized with analytical and spectroscopic techniques. The metal complexes with Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II) and Th(IV) have been prepared and characterized by elemental analyses, IR and (1)H-NMR spectroscopy, thermal and magnetic measurements. The results suggested that the Schiff base is a bivalent anion with hexadentate OONNSS donors derived from the etheric oxygen (O, O'), azomethine nitrogen (N, N') and thiophenolic sulphur (S, S'). The formulae of the complexes were found to be [ML]·xH(2)O (M=Mn(II) (x=0), Co(II) (x=1), Ni(II), (x=1), Cu(II) (x=2) and Zn(II) (x=0)) and [ML]·nCl (M=Cr(III) (n=1), Fe(III) (n=1) and Th(IV) (n=2)). The thermogravimetric analysis of the complexes shows metal oxide remaining as the final product at 700-1000 °C. Density functional theory at the B3LYP/6-31G(*) level of theory was used to investigate molecular geometry, Mulliken atomic charges and energetics. The synclinal-conformer was found to be responsible for complex formation. The calculation showed that ligand has weak field. Structural deformation and the dihedral angles rotation during complexation were investigated. The binding energy of each complex was calculated. The calculated results are in good agreement with experimental data. PMID:23266605

Hassan, Walid M I; Zayed, Ehab M; Elkholy, Asmaa K; Moustafa, H; Mohamed, Gehad G

2012-11-15

495

Using relationship styles based on attachment theory to improve understanding of specialty choice in medicine  

PubMed Central

Background Patient-provider relationships in primary care are characterized by greater continuity and depth than in non-primary care specialties. We hypothesized that relationship styles of medical students based on attachment theory are associated with specialty choice factors and that such factors will mediate the association between relationship style and ultimately matching in a primary care specialty. Methods We determined the relationship styles, demographic characteristics and resident specialty match of 106 fourth-year medical students. We assessed the associations between 1) relationship style and specialty choice factors; 2) specialty choice factors and specialty match, and 3) relationship style and specialty match. We also conducted mediation analyses to determine if factors examined in a specialty choice questionnaire mediate the association between relationship style and ultimately matching in a primary care specialty. Results Prevalence of attachment styles was similar to that found in the general population and other medical school settings with 59% of students rating themselves as having a secure relationship style. Patient centeredness was directly associated, and career rewards inversely associated with matching in a primary care specialty. Students with a self-reliant relationship style were significantly more likely to match in a non-primary care specialty as compared to students with secure relationship style (OR = 5.3, 95% CI 1.8, 15.6). There was full mediation of the association between relationship style and specialty match by the specialty choice factor characterized by patient centeredness. Conclusion Assessing relationship styles based on attachment theory may be a potentially useful way to improve understanding and counsel medical students about specialty choice.

Ciechanowski, Paul S; Worley, Linda LM; Russo, Joan E; Katon, Wayne J

2006-01-01

496

Spectroscopic and density functional theory investigation of novel Schiff base complexes  

NASA Astrophysics Data System (ADS)

Novel Schiff base (H2L, 1,2-bis[(2-(2-mercaptophenylimino)methyl)phenoxy] ethane) derived from condensation of bisaldehyde and 2-aminothiophenol was prepared in a mo