• Title/Summary/Keyword: 인지부하

Search Result 181, Processing Time 0.023 seconds

Implementation of a Learning Space Navigator for WBI (WBI를 위한 학습공간 네비게이터 구현)

  • Hong, Hyeun-Sool;Han, Sung-Kook
    • The Journal of Korean Association of Computer Education
    • /
    • v.4 no.1
    • /
    • pp.175-181
    • /
    • 2001
  • WBI provides new opportunities to realize the flexible learning environment based on hypermedia and to support distance learning with a diverse interaction. The instructors or learners in WBI claim to be able to resolve reluctant fluctuations such as disorientation and cognitive overload. To overcome these phenomena, a supplementary tool able to manage a learning space organized by the instructor's or learner's own way and offer effective navigation techniques is presented in this paper. A learning space management and navigation tool called HyperMap dynamically represents the learning space in the form of a two-dimensional labeled graph. This HyperMap also can be used for an instruction design tool, learners portfolio for the exchange of learning experiences, and the assessment of WBI.

  • PDF

Energy-Aware Web Service Using Smart Governor (스마트 거버너를 이용한 에너지 인지형 웹 서비스)

  • Jang, Sumin;On, Jinho;An, Baiksong;Lee, Byunggyu;Jun, SungIk
    • KIISE Transactions on Computing Practices
    • /
    • v.22 no.9
    • /
    • pp.467-472
    • /
    • 2016
  • In this study, we propose an Energy-Aware Web service to optimize energy efficiency using the characteristics of the system load. Currently, the service scale of data center is growing and the range of its applications is enlarged, causing interest in energy conservation. In particular, the web service has the largest proportion among various services of the data center. We propose a new energy saving method for web services guaranteeing the performance requirements of the services. The proposed method is optimized through the differences of energy-consumption rate over the system load. Performance evaluation has been performed under conditions similar to the actual service. The results indicated that the maximum energy reduction by the proposed method is up to 30% better than the existing methods.

A User Optimer Traffic Assignment Model Reflecting Route Perceived Cost (경로인지비용을 반영한 사용자최적통행배정모형)

  • Lee, Mi-Yeong;Baek, Nam-Cheol;Mun, Byeong-Seop;Gang, Won-Ui
    • Journal of Korean Society of Transportation
    • /
    • v.23 no.2
    • /
    • pp.117-130
    • /
    • 2005
  • In both deteministic user Optimal Traffic Assignment Model (UOTAM) and stochastic UOTAM, travel time, which is a major ccriterion for traffic loading over transportation network, is defined by the sum of link travel time and turn delay at intersections. In this assignment method, drivers actual route perception processes and choice behaviors, which can become main explanatory factors, are not sufficiently considered: therefore may result in biased traffic loading. Even though there have been some efforts in Stochastic UOTAM for reflecting drivers' route perception cost by assuming cumulative distribution function of link travel time, it has not been fundamental fruitions, but some trials based on the unreasonable assumptions of Probit model of truncated travel time distribution function and Logit model of independency of inter-link congestion. The critical reason why deterministic UOTAM have not been able to reflect route perception cost is that the route perception cost has each different value according to each origin, destination, and path connection the origin and destination. Therefore in order to find the optimum route between OD pair, route enumeration problem that all routes connecting an OD pair must be compared is encountered, and it is the critical reason causing computational failure because uncountable number of path may be enumerated as the scale of transportation network become bigger. The purpose of this study is to propose a method to enable UOTAM to reflect route perception cost without route enumeration between an O-D pair. For this purpose, this study defines a link as a least definition of path. Thus since each link can be treated as a path, in two links searching process of the link label based optimum path algorithm, the route enumeration between OD pair can be reduced the scale of finding optimum path to all links. The computational burden of this method is no more than link label based optimum path algorithm. Each different perception cost is embedded as a quantitative value generated by comparing the sub-path from the origin to the searching link and the searched link.

A study on the effect of information types on Drivers in Takeover period of automated vehicles (자율주행 자동차의 제어권 전환 상황에서 요구되는 정보 유형에 관한 연구)

  • Kim, Naeun;Yang, Min-young;Lee, Jiin;Kim, Jinwoo
    • Journal of Digital Contents Society
    • /
    • v.19 no.1
    • /
    • pp.113-122
    • /
    • 2018
  • In level 3 automated vehicles, drivers are expected to encounter transition of control when the system reaches its limit. Drivers need to refocus their attention on the road ahead and gain situational awareness. Appropriate information should be conveyed during this period in order to prevent human errors. In this paper, we defined the takeover process as 'in-the-middle-of-the-loop' and conducted Task Analysis and Work Domain Analysis to find out information requirements. As a result, we specified required information types and interface considerations. Moreover, we conducted an experimental study to find how the information types affect drivers on situation awareness, cognitive load and reaction time. Consequently, we found different information on system transparency should be conveyed depending on the urgency of takeover situation and driver guidance could help drivers with better situation awareness after the takeover.

Scalable Interest Management based on Interest Groups for Large Networked Virtual Environments (대규모 네트워크 가상 환경을 위한 확장성 있는 사용자 관심그룹기반 인지도 관리 기법)

  • Han, Seung-Hyun;Lim, Min-Gyu;Lee, Dong-Man
    • Journal of KIISE:Information Networking
    • /
    • v.29 no.2
    • /
    • pp.188-196
    • /
    • 2002
  • As networked virtual environment (NVE) scales in terms of users and network latency, a key aspect to consider is scalability for interactive performance because a large number of objects likely impose heavy burden especially on the network and computational resources. To improve the scalability, various relevance-filtering mechanism have been proposed. However, the existing filtering mechanism do not scale well in terms of interactive performance as the number of users increase and crowds in a specific place. In this paper, we propose a new scalable filtering scheme which reduces the number of messages by dynamically grouping users based on their interests and distance. Within a group, members communicate with each other with high fidelity. However, a representative sends up-to-dated group information of members with low transmission frequency when they are not of immediate interest but are still within the interest area. The representative is elected from members of the group in distributed manner. The proposed scheme enhances the interactive performance scalability of large-scale NVE systems as much as 18% compared with the existing approach.

Design of ATM Switch-based on a Priority Control Algorithm (우선순위 알고리즘을 적용한 상호연결 망 구조의 ATM 스위치 설계)

  • Cho Tae-Kyung;Cho Dong-Uook;Park Byoung-Soo
    • The Journal of the Korea Contents Association
    • /
    • v.4 no.4
    • /
    • pp.189-196
    • /
    • 2004
  • Most of the recent researches for ATM switches have been based on multistage interconnection network known as regularity and self-routing property. These networks can switch packets simultaneously and in parallel. However, they are blocking networks in the sense that packet is capable of collision with each other Mainly Banyan network have been used for structure. There are several ways to reduce the blocking or to increase the throughput of banyan-type switches: increasing the internal link speeds, placing buffers in each switching node, using multiple path, distributing the load evenly in front of the banyan network and so on. Therefore, this paper proposes the use of recirculating shuffle-exchange network to reduce the blocking and to improve hardware complexity. This structures are recirculating shuffle-exchange network as simplified in hardware complexity and Rank network with tree structure which send only a packet with highest priority to the next network, and recirculate the others to the previous network. after it decides priority number on the Packets transferred to the same destination, The transferred Packets into banyan network use the function of self routing through decomposition and composition algorithm and all they arrive at final destinations. To analyze throughput, waiting time and packet loss ratio according to the size of buffer, the probabilities are modeled by a binomial distribution of packet arrival. If it is 50 percentage of load, the size of buffer is more than 15. It means the acceptable packet loss ratio. Therefore, this paper simplify the hardware complexity as use of recirculating shuffle-exchange network instead of bitonic sorter.

  • PDF

Causes of Top Dead Center Error in Marine Generator Engine Power-Measuring Device (선박용 발전기 엔진 출력 측정 장치의 TDC 오차 발생 원인)

  • Lee, Ji-Woong;Jung, Gyun-Sik;Lee, Won-Ju
    • Journal of the Korean Society of Marine Environment & Safety
    • /
    • v.26 no.4
    • /
    • pp.429-435
    • /
    • 2020
  • Different methods are used for determining the output of engines to obtain the indicated horsepower by measuring the combustion pressure of cylinders, and to obtain the shaft horsepower by measuring the shaft torque. It is difficult to examine the shaft torque using the condition of the cylinder, and the most accurate method used for determining the combustion pressure involves examining the combustion state of the cylinder to evaluate the engine performance and analyze the combustion of the cylinder. During the measurement, the combustion pressure is the most important parameter used for accurately determining the cylinder angle because the cylinder pressure is indicated based on the angle of the crankshaft. In this study, an encoder was used as the crank angle sensor to measure the cylinder pressure on the generator engine of the actual operating ship. The reasons for the differences between the top dead center (TDC) recognized by the encoder (TDCencoder) and the TDC recognized by the compression pressure (TDCcomp) were considered. The dif erences between the TDCcomp and TDCencoder of the cylinders measured at idle running, 25 %, 50 %, and 60 % loads were analyzed to determine for the crankshaft production effect, the crankshaft torsion effect owing to the increased rotational resistance from the increased load, and the coupling damping effect between the engine and generator. It was confirmed that the TDC error occurred up to 3° crank angle as the load of the generator increased.

Cognitive Load and Instructional Design in Medical Education (인지부하를 고려한 의학교육 교수-학습 설계)

  • Oh, Sun A;Kim, Yeon Soon;Chung, Eun Kyung
    • Korean Medical Education Review
    • /
    • v.12 no.2
    • /
    • pp.27-33
    • /
    • 2010
  • The purpose of this study was to review the definition of cognitive load (CL), the relationship between CL and instructional design, and to provide a viewpoint of CL in curriculum and instructional design in medical education. Cognitive load theory (CLT) makes use of three hypotheses about the structure of human memory: working memory (WM) is limited in terms of the amount of information it can hold, in contrast with WM, long term memory is assumed to have no limits and organizes information as schemata. CL indicates the mental load on the limitation of WM. CLT has been used to design instructional interventions that help to ease the learning process. Extraneous CL is related to irrelevant instructional interventions, while intrinsic CL is the complexity of the information itself. Germane CL is the cognitive process for acquiring schema formation. It is a necessary CL to achieve deeper comprehension and solve problems. The range of medical education includes complex, multifaceted and knowledge-rich domains with clinical skills and attitudes. Therefore, CLT may be used to guide instructional design in medical education in terms of decreasing extraneous CL, adjusting intrinsic CL and enhancing the germane CL.

Effects of Information Overload on Hostile Behaviors Online (온라인 상의 적대적 행동에 정보과부하가 미치는 영향)

  • Jin, Sanghyung;Rhee, Cheul;Jang, Youngbin
    • The Journal of Society for e-Business Studies
    • /
    • v.24 no.2
    • /
    • pp.179-197
    • /
    • 2019
  • Although there have been lots of studies about users' behaviors online, few have explored the mechanism of hostile behaviors. In this sense, this study aims at discovering what may elevate users' hostile behaviors. More specifically, we tried to find the relationship between flaming behavior and perception factors such as perceived risk, anonymity and expected emotional reaction. A survey was conducted to investigate the relationship of the above variables. As a result, all these variables show significant effects on flaming, and information overload are found to act as a moderator. We carefully conclude that flaming in online community can be reduced by preventing information overload each user perceives.

A Simple Average Power Theory and Modified Compensation Performance Evaluation of Active Power Filters (능동전력필터의 간단한 평균전력이론과 수정된 보상성능 평가법)

  • 정영국;임영철;양승학
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.13 no.3
    • /
    • pp.64-72
    • /
    • 1999
  • The fictitious power theory in time domain is very easy to understand, but power analyzing speed of active power is increased, because power is analyzed using signal tedmiques based on the corre1ation between voltage and current wavefonns. Also, conventional methods in time/frequency domain to evaluate the correlation performance of active power filters are not provided easy solutions. So, the authors have previously proposed 3-D current coordinates which is composed into active component, fundarrental reactive component and distorted component of nonlinear loads current. This trethod has excellent perfonnance, but can not evaluate the characteristics of nonlinear load current whether It is inductive or capacitive. Therefore, To overcorre problems trentioned previously, this paper deals with the simple average power theory and the modified 3-D current coordinates for evaluating the compensation perfonnance of active power filters. To confirm the validity, active power filter simulator is developed using C-language. From the simulation, results are discussed their utility.tility.

  • PDF