• 디지털산업정보학회논문지
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• 제9권3호
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• pp.91-98
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• 2013

Node which plays the role of cache server does not exist in the wireless ad-hoc network consisting of only mobile nodes. Even if it exists, it is difficult to provide cache services due to the movement of nodes. Therefore, the cooperative cache technique is necessary in order to improve the efficiency of information access by reducing data access time and use of bandwidth in the wireless ad-hoc network. In this paper, the whole network is divided into zones which don't overlap and master node of each zone is elected. General node of each zone has ZICT and manages cache data to cooperative cache and gateway node use NZCT to manage cache information of neighbor zone. We proposed security structure which can accomplish send and receive in the only node issued id key in the elected master node in order to prepare for cache consistent attack which is vulnerability of distributed caching techniques. The performance of the proposed method in this paper could confirm the excellent performance through comparative experiments of GCC and GC techniques.

• 전기전자학회논문지
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• 제18권1호
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• pp.146-151
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• 2014

스마트 그리드는 기존 전력망에 ICT(Information Communication Technology)기술과 타산업간의 지속적인 융합으로 다양한 부가서비스를 제공한다. 다양한 프로토콜을 사용하고 있는 스마트 그리드 응용시스템이 상호간에 독립적으로 정보를 교환하기 위해서는 기존 프로토콜에 독립적인 미들웨어 사용이 필요하다. 스마트 그리드 응용시스템들은 대부분 All-IP 기반에서 정보 교환이 이루어진다. 현재 All-IP 기반의 미들웨어는 대표적으로 SOAP(Simple Object Access Protocol)과 RESTful(REpresentational State Transfer ful)이 있다. 본 논문에서는 SOAP과 RESTful의 성능을 비교 분석하여 향후 스마트 그리드 응용 시스템 구축 시 사용할 수 있는 SOAP와 RESTful의 성능을 비교분석하였다.

• Asia pacific journal of information systems
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• 제15권1호
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• pp.1-24
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• 2005

The purpose of this study is to identify the factors affecting the performance of knowledge management systems. To extend DeLone & MeLean's model, we included the user specialization in the information systems success model. The questionnaires are collected from 109 knowledge management system users. The major findings are summarized as followed. First, system characteristics such as ease of use, response time, and knowledge management process support affect the knowledge management systems usage. Second, knowledge characteristics such as relevancy, completeness, reliability, importance, and currency also affect the knowledge management systems usage. Third, the end-users are satisfied with the knowledge management systems because it is easy to use and relevant.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제8권4호
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• pp.1463-1480
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• 2014

It is well known that sparse code is effective for feature extraction of face recognition, especially sparse mode can be learned in the kernel space, and obtain better performance. Some recent algorithms made use of single kernel in the sparse mode, but this didn't make full use of the kernel information. The key issue is how to select the suitable kernel weights, and combine the selected kernels. In this paper, we propose a novel multiple kernel sparse representation based classification for face recognition (MKSRC), which performs sparse code and dictionary learning in the multiple kernel space. Initially, several possible kernels are combined and the sparse coefficient is computed, then the kernel weights can be obtained by the sparse coefficient. Finally convergence makes the kernel weights optimal. The experiments results show that our algorithm outperforms other state-of-the-art algorithms and demonstrate the promising performance of the proposed algorithms.

• 경영정보학연구
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• 제23권4호
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• pp.1-22
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• 2021

코로나19로 인한 언택트 환경 속에서 모바일 간편결제가 확산하고 있다. 모바일 결제 시 본인 인증을 위해 다양한 수단이 사용되고 있으며, 최근 생체정보의 활용이 증대되고 있다. 본 연구에서는 생체정보 사용에 영향을 주는 여러 가지 요인과 사용의도에 대한 상관 분석을 하였다. 요인별 변수를 성과기대, 노력기대, 사회적 영향 및 보안성으로 구분하고, 사용의도와의 연관성 파악을 위해 통합기술수용이론을 기반으로 실증분석을 하였다. 이를 위해 변수들을 단계적으로 투입하는 단계적 회귀분석을 총 4회 실시하였다. 분석결과, 통합기술수용이론에서 제시된 성과기대, 노력기대, 사회적 영향, 보안성 등이 모두 사용의도에 긍정적인 영향을 미치고 있으며, 또한 노력기대와 보안성은 생체인증 경험여부에 따라 사용의도에 조절효과가 있는 것으로 제시되었다. 이 연구를 통해 생체정보의 효과적 활용과 기술 발전에 도움이 되기를 기대한다.

• 품질경영학회지
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• 제48권2호
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• pp.283-296
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• 2020

Purpose: This study examined the importance and satisfaction of consumer's perception of the information delivery format of products and services required and recommended by KS A ISO / IEC Guide 13: 2003 and KS A ISO / IEC Guide 37: 2003. Methods: In this study, the importance and satisfaction of clarity, principles of information transfer, how to use expressions and technical terms, and technical terms, warning signs, and durability were investigated. Results: The t-test analysis of the importance and satisfaction of the Writing Rules of the product user guide showed that all items had statistically significant differences. The importance of the writing rules of the product user guide for the use of the product was in the order of warning signs (4.423), how to use expressions and technical terms (4.215), principles of information transfer (4.163), clarity (3.914), and finally durability (3.851). Conclusion: Among the 'explanation,' 'instruction' and 'warning' functions of the Product User Guide, the consumer uses the manual to identify the inherent dangers and misuse of the product. Besides, since the life of the product is prolonged, the Product User Guide also needs to improve the quality of the cover or paper so that it can use for a long time.

• 한국통신학회논문지
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• 제24권12A호
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• pp.1960-1965
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• 1999

본 논문에서는 연쇄부호(concatenated code) 시스템에서 erasure 보호를 적용하는 새로운 방법을 제안하였다. 제안된 방법으로 복호를 수행하여 이전의 복호결과 보다 개선되었으면 현재의 결과를 이용하고 그렇지 않으면 이전의 결과를 이용한다. 본 논문에서 사용한 부호는 RS(63.31), 콘볼루션(4,1/2) 이다. 또한 시뮬레이션과 이론적 결과를 비교하여 성능을 확인하였다. 결과적으로 제안된 복호방법은 erasure를 적용하지 않았을 때 보다 0.5$\leq\rho\leq$1에서 약 2dB의 성능향상을 얻을 수 있었으며, $\rho\leq$0.3에서 약 4dB의 성능향상이 있었다.

• Asia pacific journal of information systems
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• 제12권4호
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• pp.37-53
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• 2002

The three main purposes of this paper are to (1) identify critical success factors(CSF's) for electronic commerce(EC), (2) investigate the explanatory power of these CSF's on firm performance, and (3) compare differences in evaluating CSF's and explaining impact of CSF's on performance between Korean and U.S.A. EC managers. Through a literature review and interviews with managers in EC firms, a list of 16 CSF's consisting of 111 items was compiled. In the second stage, questionnaires were administered to managers of EC companies in Seoul, Korea and Texas, U.S.A. Survey results show that CSF's have very significant explanatory power for firm performance in both Korean and U.S.A. While security, privacy, technical expertise, information about goods/services, and variety of goods/services are the most explanatory CSF's in Korea, evaluation of EC operations, technical expertise, and ease of use show most explanatory power in U.S.A. This analysis confirms the fact that customers use EC if they feel comfortable about navigating EC for information about a variety of goods/services without technical difficulty and in a secure and private way.

• 한국산업정보학회논문지
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• 제16권5호
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• pp.37-44
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• 2011

스마트폰이 최근 일반 대중에게 빠르게 확산되면서 다양한 분야에서 정보이용과 소통방식의 변화를 일으키고 있다. 본 논문에서는 모바일 환경에서 중등학교 교사들의 수행평가 업무를 효율적으로 종합 관리할 수 있는 수행평가관리시스템을 구현하였다. 제안하는 시스템을 교사의 수행평가 업무에 적용한 결과, 교사의 수행평가 업무을 줄일 수 있어, 학생 지도에 전념할 수 있게 되었다.

• Journal of Positioning, Navigation, and Timing
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• 제7권4호
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• pp.205-215
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• 2018

The recent emergence of new Global Navigation Satellite Systems (GNSS) has resulted in a gradual improvement in the performance of positioning services. This paper verifies the degree of improvement in positioning performance of Assisted-GNSS (A-GNSS) receivers using assistance information compared to standalone-GNSS receivers that do not use assistance information in various urban environments in Korea. For this purpose, field tests are performed in various urban and indoor environments in Korea. The assistance information is provided by u-blox's AssistNow Online and low-cost commercial receivers are used for mobile station receivers. Through experiments, the Time to First Fix (TTFF), acquisition sensitivity, and position accuracy performance improvement are analyzed. The results of the experiments show that using assistance data improved the performance in all experiment locations, and, in particular, a significant performance improvement in terms of TTFF.