• Proceedings of the Korean Statistical Society Conference
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• 2000.11a
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• pp.213-218
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• 2000

본 논문은 ColdFusion을 이용하여 온라인 설문조사 및 분석시스템을 구현한 것이다. 본 시스템은 그래픽 부분에서 미약한 C와 수행 속도에서 미약한 PHP의 단점을 보안하여 ColdFusion과 C의 장점을 합하여 Web 상에서의 설문조사와 더불어 기본적인 통계분석을 초보자들도 가능하도록 사용자의 관점에서 구현하였다. 기존의 설문조사 시스템이 갖는 1회성 조사라는 단점을 극복하여 축적되는 DB를 구축함으로 추세 분석이 가능하도록 하였다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.15 no.6
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• pp.129-134
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• 2015

This paper analyzes file access characteristics of smartphone apps and finds that a large portion of file writes are performed only once. Based on this observation, we present a new buffer cache management scheme that considers this characteristics. Buffer cache improves storage performance by maintaining hot file data in memory thereby servicing subsequent requests without storage accesses. However, it should flush modified data to storage in order to resist system crashes. The proposed scheme evicts cache data that has been written only once upon flushes, thus improving cache space utilization. Simulation experiments show that the proposed scheme improves cache hit ratio by 5-33% and power consumption by 27-92%.

• Proceedings of the Korean Society of Computer Information Conference
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• 2017.07a
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• pp.429-430
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• 2017

본 논문은 챗봇을 활용하여 반복적인 입시 질문을 응답하는 시스템에 설계하였다. 1회성 응답 대신 문맥을 기억하여 사용자의 의도를 파악하고 자세한 응답을 제공한다. 또한, 한글 처리와 입시 관련 데이터베이스 연동을 통해 일반화 할 수 있는 유연성을 갖는 구조이며, 반복적인 질의응답을 챗봇으로 대신할 수 있을 것으로 기대된다.

• 한국정보교육학회:학술대회논문집
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• 2008.01a
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• pp.281-286
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• 2008

현재 적용되고 있는 7차교육과정은 학생들의 평가에 있어 종전의 1회성 평가가 아닌 단계별 수시평가의 하나인 수행평가의 중요성을 강조하고 있다. 이러한 결과로 일선 학교에서는 종이로 된 수행평가 결과물을 파일에 보관하는 전통적인 아날로그식 포트폴리오의 방법을 도입하고 있으나 많은 단점이 지적되고 있고, 이러한 전통적 포트폴리오의 단점을 보완할 수 있는 방법으로 e-portfolio의 방법이 제시되고 있다. 본 연구에서는 웹기반 수행평가를 시행하기 위한 e-portfolio 시스템을 설계, 구현하여 이를 초등학생의 교과 수행평가에 직접 적용해 봄으로써 웹기반의 e-portfolio가 주는 교육적 효과를 알아보는데 연구의 목적이 있다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.18 no.5
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• pp.155-160
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• 2018

In this paper, we found that buffer cache in general systems does not perform well in rendering software, and presented a new buffer cache management scheme that resolves this problem. To do so, we collected various file I/O traces of rending software and analyzed their characteristics. From this analysis, we observed that file I/Os in rendering consist of long loops, short loops, random accesses, and write-once accesses. Based on this observation, we presented a buffer cache management scheme that allocates cache space to each access types and manages them appropriately, thereby improving the buffer cache performances by 19% on average and up to 55%.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2017.05a
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• pp.154-156
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• 2017

Constant variance of degradation data over time has been generally assumed to estimate storage lifetime using destructive, accelerated degradation data over time. However, performance data of ammunitions deteriorate over time, and the standard deviation would tend to increase over time. This paper shows storage lifetime comparison results for constant variance and time-variant variance assumptions of degradation data over time, and proposes that time-variant variance assumption should be considered to increase accuracy in lifetime estimation.

• Journal of the Korea Society of Computer and Information
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• v.16 no.5
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• pp.127-134
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• 2011

A finite state machine was designed to control user's gaze on the screen when the user is monitoring the. It consists of a set of situations where pupils are gazed and a set of states which decide the gaze on a screen or sleeping. The states were especially classified into main states, pre-states and potential states. The machine uses the situation history, which decide current state using continuous previous situation and current situation, and improves the accuracy to control the gaze on a screen. We implemented the machine with the data which were get using a pupil detection method, and tested the verification of the system with monitoring operations. The experimentation using the method which get date from real images shows advantage of decision whether it is temporary gaze or long-term gaze.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.19 no.4
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• pp.65-69
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• 2019

This paper presents an optimized adoption of NVM for the storage system considering application characteristics. To do so, we first characterize the storage access patterns for different application types, and make two prominent observations that can be exploited in allocating NVM storage efficiently. The first observation is that a bulk of I/O does not happen on a single storage partition, but it is varied significantly for different application categories. Our second observation is that there exists a large proportion of single accessing in storage data. Based on these observations, we show that maximizing the storage performance with NVM is not obtained by fixing it as a specific storage partition but by allocating it adaptively for different applications. Specifically, for graph, database, and web applications, using NVM as a swap, a journal, and a file system partitions, respectively, performs well.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.2
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• pp.766-773
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• 2021

Chemicals, such as ammunition, are disposable items that cannot be reused because of their operational characteristics. The reliability of the test process and test results are important factors in evaluating the performance of guns and ammunition. The pressure after firing is a crucial value in an acceptance test of guns and ammunition performance; hence, accurate measurements are required. The pressure in the artillery is measured using the copper crusher gauge. The compression amount of copper is converted into a pressure by either a length-pressure conversion table or conversion formula. Therefore, the exact measurement of the squeeze of the copper crusher is related directly to the correct estimate of the pressure. Currently, the pressure is measured manually by the operator, which always includes some human error. In this study, the cause of the measurement error was analyzed, and the automatic measuring system for copper crusher deformation was developed to minimize the error elements. A copper crusher could be measured using the probe sensor and CCD camera, and the Jig for stable positioning was also designed. A designated SW was also developed for the system operating and measurement-analysis. This measuring system through this study may be used for an ammunition stockpile reliability test and gun/ammunition acceptance test.

• Journal of the HCI Society of Korea
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• v.8 no.1
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• pp.1-9
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• 2013

This is to develop a new way of testing self-esteem by adopting DAP(Draw a Person) test and to make a platform to digitalize it for young people in the adolescent stage. This approach is to get high effectiveness of the self-esteem measurement using DAP test, including some personal inner situations which can be easily missed in the large statistical analysis. The other objective of this study is digitalize to recover limits of DAP test in the subjective rating standard. It is based on the distribution of the figure drawing expressed numerically by the anxiety index of Handler. For these two examinations, we made experiment through 4 stages with second grade middle school 73 students from July 30th to October 31th in 2009 during 4 months. Firstly, we executed 'Self Values Test' for all 73 people, and divided them into two groups; one is high self-esteem group of 36 people, the other is low self-esteem group of 37 people. Secondly, we regrouped them following D (Depression), Pd (Psychopathic Deviate), Sc (Schizophrenia) scales of MMPI; one is high self-esteem group of 7 people, the other is low self-esteem group of 13 people. Thirdly, we conducted DAP test separately for these 20 people. We intended to verify necessity and appropriateness of direction of 'Digitalizing Measurement System' by comparing and analyzing relation between DAP and Self-esteem following evaluation criteria which has similarity in 3 tests, after executing DAP to reflect peculiarity of adolescents sufficiently. We compared and analyzed result abstracted by sampling DAP test of two groups; One is high self-esteem group of 2 people, the other is low self-esteem group of 2 people; to confirm whether we can improve limitation that original psychological testing has by comparing mutual reliance of measurement test. Finally, with DAP test gained from correlations between self-esteem and melancholia following as above-mentioned steps, we discovered possibility of realization to get a concrete and individual criteria of evaluation based on Expert System as a way of enhancing accessibility in quantitative manner. 'Digitalizing Measurement Program' of DAP test suggested in this study promote results' reliability based on existing tests and measurement.