• Nuclear Engineering and Technology
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• v.27 no.1
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• pp.53-66
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• 1995

Since the current licensed system codes for Non-LOCA safety analysis are applicable only for a specific type PWR, it is necessary to develope a new system analysis code applicable for all apes of PWRs. As a R&D program, KAERI is developing TASS code as an interactive and faster-than-real-time code for the NSSS transient simulation of both CE and Westinghouse plane. It is flexible tool for PWR analysis which gives the user complete control over the simulation through convenient input and output options. In this paper the code applicability to Westinghouse ape plants was verified by comparing the TASS prediction to plant data of loss of AC power and loss of load transients, and comparing to the prediction of RELAP5/MOD3 for feedline break, locked rotor, steam generator tube rupture and steam line break accidents.

• Journal of the Korea Society of Computer and Information
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• v.11 no.1 s.39
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• pp.185-194
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• 2006

The ubiquitous computing environment focuses on recognizing the context and Physical entities, whereas, previous computing environments mainly focused on the conversational interactions between the computer and the user. For this reason, there has been an increase in the research of context aware computing environments. In previous researches , context services are designed using context ontology used in context aware middleware. So, context service cannot change the context ontology in execution time. We propose a hierarchical context ontology management for context aware service to change their ontology in execution time. And we also a resolution model for context conflict which is occurred in inference of context. We have designed a middleware based on this model and implemented the middleware. As the middleware is implemented on the OSGi framework, it can cause interoperability among devices such as computers, PDAs, home appliances and sensors. It can also support the development and operation of context aware services, which are required in the ubiquitous computing environment.

• Education of Primary School Mathematics
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• v.14 no.3
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• pp.303-316
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• 2011

The purpose of this study was to analyze a first grader's number sense in playing the searching complement of ten game. For this purpose, the researcher conducted the game with a first-year student and analyzed her number sense based on conversations in playing games. The results obtained in this study were as follows: First, the student had a very big interested in the game and it was easily converted into additional situations. Second, she fully understood the rules of the game and made the complement of the given number. However, she was not good at making complement of twelve. Third, she made new rules like using three or four cards. She easily made the number 10 with two cards, but she didn't easily understand how to make 10 with more than three cards.

• Journal of KIISE:Computer Systems and Theory
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• v.28 no.12
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• pp.674-684
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• 2001

This paper presents the SIC(Size-Interval-Count) prefetching scheme that can record the file access patterns of applications within a relatively small space of memory based on the repetitiveness of the file access patterns. Several knowledge-based prefetching methods were recently introduced, which includes high correctness in predicting future accesses of applications. They records the access patterns of applications and uses recorded access pattern information to predict which blocks will be requested next. Yet, these methods require to much memory space. Accordingly, the proposed method then uses the recorded file access patterns, referred to as "SIC access pattern information", to correctly predict the future accesses of the applications. The proposed prefetching method improved the response time by about 40% compared to the general file system and showed remarkable memory efficiency compared to the previously knowledge-based prefetching methods.

• Journal of the Korean Institute of Intelligent Systems
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• v.20 no.6
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• pp.741-747
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• 2010

These days many meeting minutes of various organizations are publicly available and the interest in these documents by people is increasing. However, it is time-consuming and tedious to read and understand whole documents even if the documents can be accessed easily. In addition, what most people want from meeting minutes is to catch the main issues of the meeting and understand its contexts rather than to know whole discussions of the meetings. This paper proposes a novel method for summarizing documents considering the characteristics of the meeting minutes. It first extracts the sentences which are addressing the main issues. For each issues expressed in the extracted sentences, the sentences related with the issue are then extracted in the next step. Then, by transforming the extracted sentences into a tree-structure form, the results of the proposed method can be understood better than existing methods. In the experiments, the proposed method shows remarkable improvement in performance and this result implies that the proposed method is plausible for summarizing meeting minutes.

• The Journal of the Korea Contents Association
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• v.15 no.5
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• pp.179-190
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• 2015

This study discusses on the influential factors of satisfaction in communication by focusing on the political communication phenomenon that is revealed in our society. The acts of political communication and its communication satisfaction are examined by exploring individuals' political inclination and their media usage which are the main influential factors of political communication. An interview survey was conducted on a thousand adults over the age of nineteen who are residing in sixteen cities and provinces nationwide. As a result, a high rate of online media usage was observed among people with progressive political inclination. It showed that the political communication acts of 'writing/communicating' which indicates ons actively posting their personal opinions, has a positive influence on communication satisfaction. On the other hand, the usage of offline media was dominant over people with conservative and neutral political inclination. A passive act of 'reading/watching,' which is to observe other people's opinions, was shown by most of the interviewees. Therefore, it was able to discuss that in order for a harmonious flow of political communication among our society, the understanding of citizens' political characteristic must be preceded and the differentiated political communication using media must be raised accordingly.

• Journal of the Microelectronics and Packaging Society
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• v.20 no.1
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• pp.33-37
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• 2013

In this research, we investigated the effect of mole concentration of precursor on morphological, structural and optical properties of ZnO nanorods. ZnO nanorods were hydrothermally grown on c-plane sapphire substrates in aqueous solution which contains zinc nitrate hexahydrate and hexamethylenetetramine at 90oC in the precursor range of 0.01 M to 0.025 M. With the increase of mole concentration, length and diameter of ZnO nanorods increased. In all the conditions, the growth direction of rods was longitudinally c-axis direction. From the strong emission peak at 380 nm of PL spectra at room temperature, we could confirm that the crystal quality of ZnO nanorods is good to emit radiative recombination spectra.

• The Journal of Korean Association of Computer Education
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• v.6 no.4
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• pp.85-93
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• 2003

This paper proposes an item based learning system using e-mail in order to motivate learners effectively and avoid the bottleneck problem under highly competitive access situations such as the traditional web based learning. The proposed system has th ree features as follows: first, through e-mail, a learner receives test items depending on his/her level, submit an answer sheet, and then identify an assessment with help messages. Secondly, on the web, an instructor easily constructs item database without any other tools and monitors the status of each learner by identifying the learners' record. Finally, an easy-to-use interaction mechanism enhances the inter-activity between learners and instructors, and the usability of Q&A(Question and Answer) service by incorporating e-mail into the web bulletin board.

• International Commerce and Information Review
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• v.13 no.1
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• pp.197-216
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• 2011

Computer technology has enhanced a new transaction between device or software not just between humans. It offers users agent-like functionality and becomes increasingly common. It's roles diverse from gathering informations to automated trading. However, the use of new technology challenges to traditional legal systems and makes issues in adjusting the legal systems. Contract with electronic agents makes some issues such as whether the contract is enforceable or what principle's responsibility about the operation of electronic agents is. This paper analysis these issues and provides some solutions. First of all, we should make a legal act or revise previous laws. It is better that new civil law establishes for electronic communications and approach the law of agency for attribution of the responsibility issue. Secondly, in practice, website such as shopping mall should provide the terms of conditions to bind a contract.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.41 no.3
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• pp.11-16
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• 2004

Recently, collaborative works are increased more and more over the distributed heterogeneous computing environments. The availability of high-speed wide-area networks has also enabled collaborative multimedia applications such as video conferencing, distributed interactive simulation and collaborative visualization. Distributed high performance computing and collaborative multimedia applications, it is extremely important to efficiently perform group communication over a heterogeneous network. Typical group communication patterns are broadcast and Multicast. Heuristic algorithms such as FEF, ECEF, look-ahead make up the message transmission tree for the broadcast and multicast over the distributed heterogeneous systems. But, there are some shortcomings because these select the optimal solution at each step, it may not be reached to the global optimum In this paper, we propose a new heuristic algerian that constructs tree for efficiently collective communication over the previous heterogeneous communication model which has heterogenity in both node and network. The previous heuristic algorithms my result in a locally optimal solution, so we present more reasonable and available criterion for choosing edge. Through the performance evaluation over the various communication cost, improved heuristic algorithm we proposed have less completion time than previous algorithms have, especially less time complexity than look-ahead approach.