• Annual Conference of KIPS
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• 2017.11a
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• pp.1109-1111
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• 2017

본 논문은 다양한 센서들과 디바이스들이 실시간으로 정보를 주고 산업 IoT 환경에서 실시간 분산 제어 역할을 하는 마스터 노드(Master Node)인 CPS시스템이 시스템장애 또는 내, 외부적인 요인으로 인해 정상적인 수행을 하지 못할 때 일시적으로 마스터 노드의 기능을 수행할 수 있는 싱크노드(Sink Node)를 선정하여 대리 마스터 노드를 결정하는 방안을 제시한다. 산업 IoT환경에서 마스터 노드의 역할로써 중요한 파라미터들을 선정한다. 이 후 상황에 따라 파라미터들의 가중치를 변경하여 우선순위 알고리즘을 통해 지속적으로 싱크 노드들의 우선순위에 대한 정보를 마스터 노드와 싱크노드들 간 공유하게 된다. 마스터 노드의 결함이 발생 시 우선순위가 높은 싱크노드가 마스터 노드의 역할을 대신 수행하여 예기치 못한 상황에도 데이터를 유지할 수 있도록 한다.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.37 no.10
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• pp.73-81
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• 2000

This paper presents the design and simulation of a power and area efficient interpolation FIR filter with partitioned look up table (LUT) structure. Using the symmetry of the filters coefficients and the contents of the LUT, the area of the proposed filter is minimized. The two filters share the partitioned LUT and activate the LUT selectively to realize the low power operation. The proposed filter has been designed in a 5.0 Volts 0.6${\mu}m$ CMOS technology. Power consumption results have been obtained from Powermill simulations. Experimental results suggest that the proposed filter reduces both the power consumption by 28% and simultaneously the gate area by 5% simultaneously compared to the previously proposed filters.

• Journal of IKEEE
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• v.7 no.2 s.13
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• pp.281-287
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• 2003

This paper proposed an improvement scheme for effective usage of radio-frequency management system(RFMS), which has been operated to facilitate national spectrum management and monitoring in Korea. Based on the wave propagation models, interference analysis algorithms, and sharing criteria recommended by ITU-R, we derived criteria for the automated selection of the channel interference analysis algorithms and sharing conditions adequate to the environment to be analysed. Then using the obtained criteria, computer and program has been made and shown to select the most appropriate propagation models, interference analysis algorithms, and sharing criteria from the ones provided in RFMS, with the illustrative example.

• Proceedings of the Korea Multimedia Society Conference
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• 2000.11a
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• pp.25.1-30
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• 2000

멀티미디어 시나리오는 멀티미디어 응용 프로그램에서 객체의 시간적 공간적 재생 순서와 관계, 그리고 사용자가 멀티미디어 응용 프로그램과 상호 작용하는 방법을 기술하며, 멀티미디어 시나리오 데이터베이스는 이 시나리오를 저장, 관리한다. 시나리오 데이터베이스의 효율적인 관리와 접근을 위해 멀티미디어 시나리오를 계층적 구조로 정의 할 수 있다. 계층적인 멀티미디어 시나리오 구조는 시나리오 객체 정보와 객체간의 관계에 대한 정보가 여러 단위로 공유되고 재사용되는 효과가 있다. 또한, 각 계층을 구성하는 원소들에 대해 시간적 공간적 속성과 관계를 정의함으로써, 시나리오의 구성이 미디어 객체의 관계만으로 기술되었던 시나리오에서보다 복잡하고 다양하게 표현되도록 한다. 멀티미디어 시나리오와 사용자의 상호작용은 시나리오 재생의 제어와 시나리오의 진행 방향 선택에 대해 이루어진다. 본 논문은 멀티미디어 시나리오의 구조를 모델링하고, 웹 기반 환경에서의 시나리오 저작과 재생을 위한 시스템을 구현한다.

• Journal of KIISE:Databases
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• v.37 no.1
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• pp.56-69
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• 2010

In blogspace, there are posts that deal with a common topic and bloggers that are interested in these posts. In this paper, we define a blog community as a group of these bloggers and posts. With a blog community, we can establish various business policies for target marketing, sharing high quality data, and mobilizing the activities in the blogspace. Unlike internet cafes, bloggers participate in blog communities without explicit membership. So, it is not easy to identify the members of a community. In this paper, we propose an effective approach for extracting a blog community that is related to a given topic. First, we choose seed posts that is highly related to a given topic, and select bloggers that are related to the topic with the seed posts. Then, we select posts that are related to the topic with the selected bloggers. By repeating this, we find all the posts and bloggers that are members of the community related to a given topic in blogspace. We verify the superiority of the proposed approach by analyzing extracted blog communities.

• Journal of the Korean Chemical Society
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• v.26 no.1
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• pp.43-48
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• 1982

Four 2, 2, 2-trichloroethyl esters possessing a phthalimido group, 2,2,2-trichloroethyl phthalimidoacetate (1a), 2,2,2-trichloroethyl 6-phthalimidohexanoate (2a), 2,2,2-trichloroethyl 2-phthalimidopropanoate (3a) and 2,2,2-trichloroethyl N-phthaloylcarbamate (4a) were prepared and treated with zinc dust in aqueous acetic acid(Method A), in aqueous THF(Method B), and in aqueous THF containing triethylamine (Method C). By Methods A and B, 2,2,2-trichloroethyl ester linkage of the compounds 1a, 2a and 3a was reductively cleaved with concurrent reduction of phthalimido group to a 3-hydroxyphthalimidino group. By employing Method C, however, 2,2,2-trichloroethyl ester linkage of all the four compounds was selectively cleaved while the phthalimido group was preserved.

• The Journal of the Convergence on Culture Technology
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• v.8 no.6
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• pp.861-866
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• 2022

Seoul introduced the shared bicycle system, "Seoul Public Bike" in 2015 to help reduce traffic volume and air pollution. Hence, to solve various problems according to the supply and demand of the shared bicycle system, "Seoul Public Bike," several studies are being conducted. Most of the research is a strategic "Bicycle Rearrangement" in regard to the imbalance between supply and demand. Moreover, most of these studies predict demand by grouping features such as weather or season. In previous studies, demand was predicted by time-series-analysis. However, recently, studies that predict demand using deep learning or machine learning are emerging. In this paper, we can show that demand prediction can be made a little better by discovering new features or ordering the importance of various features based on well-known feature-patterns. In this study, by ordering the selection of new features or the importance of the features, a better coefficient of determination can be obtained even if the well-known deep learning or machine learning or time-series-analysis is exploited as it is. Therefore, we could be a better one for demand prediction.

• Management & Information Systems Review
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• v.36 no.2
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• pp.187-206
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• 2017

This study empirically investigated the direct and indirect effects of inter-organizational relationships control mechanisms (IRCM; prudent partner selection and complex contract) on the decrease of inter-organizational risks (i.e., relational risk and performance risk). The empirical results showed that prudent partner selection has a positive impact on the degrees of inter-organizational cooperation and the levels of inter-organizational information flow. The effects of complex contract on the inter-organizational cooperation and information flow were not significant. In the results of the decrease of inter-organizational risks, it was observed that inter-organizational cooperation has significant positive effects on the decrease of both relational risk and performance risk. It was found that partner selection only influences the decrease of performance risk. The impact of inter-organizational information flow on the decrease of inter-organizational risks was not statistically significant. The indirect effects of IRCM on the decrease of performance risk through inter-organizational cooperation were also empirically demonstrated. The significant impact of inter-organizational cooperation on the decrease of risks implies that high levels of collaborations among employees decrease the risk of opportunistic behavior as well as the possibility of low degrees of performance through cooperative efforts. According to the results of the effects of risks on supply-chain performance, only the impact of performance risk was negatively significant. This result points out that the low levels of performance cause delays in delivery and product launch, deterred production and delayed market response, and these deteriorated managerial activities necessarily decrease the degrees of supply-chain performance.

• Journal of the Korean Society for information Management
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• v.40 no.3
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• pp.25-54
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• 2023

At a time when open data receives attention as an international trend, there is a need to discuss the role of international journals in Korea to support data sharing. Based on surveys and interviews of editors from the international journals, we identified factors affecting the policy adoption and examined the journal editors' perception on the adoption and components of the data sharing policy. As a result, scholarly journals that have adopted or are planning to adopt policies have recognized that data sharing is an international trend and can contribute to research development, but they stressed that efforts to improve the perception of data sharing were still necessary. Educational activities and compensation for sharing data were needed at scholarly journals' and communities' level. Also, components perceived important and selected by more than half of the editors as mandatory were 'data availability statement', 'data sharing level', 'data sharing method', and 'data citation'. While scholarly journals do not always need to mandate data sharing, it was necessary to mention conditions where data cannot be shared through data availability statements. The role of the organization developing and operating a repository appropriate for situations in Korea was also emphasized. In addition, by identifying factors affecting the policy adoption, significant differences were found in Journal Impact Factor quartiles, publication type, and subject area. This finding indicated that journals with a high impact factor are likely to have resources to support data sharing, and open access or hybrid journals are likely to have interest in open data as a part of open science. In the medical research area, active movements for data sharing in academic communities have promoted the adoption of data sharing policies. This study would be used as basic data to facilitate the adopton and operation of scholarly journals' data sharing policies in Korea.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 2002.06a
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• pp.425-432
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• 2002

오늘날 컴퓨터는 우리 사회 전 분야에 걸쳐 중요한 기능을 담당하고 있으며, 20세기 초에 컴퓨터가 만들어진 이후로 인류사회는 여러 분야에서 이들 컴퓨터에 의한 새로운 조류를 경험하고 있다. 이들 정보화의 도래는 우리의 생활 전반을 변화시키고 있으며, 이들 변화의 물결 속에서 우리는 긍정적인 영향과 아울러 부정적인 영향이 동시에 공존하는 사회를 경험하고 있다. 특히, 컴퓨터의 발달과 정보화 시대의 도래는 무한한 정보를 공유할 수 있는 유익한 공간을 제공하는 동시에 프라이버시 침해 등 많은 범죄의 온상이 되는 공간을 제공하는 이중성을 보이고 있다. 우리의 선택여하에 관계없이 이미 우리는 정보화 환경에 속하게 되었으며, 이로써 발생되는 많은 문제점을 인식하고 해결해 나가야할 책임과 의무가 불가피한 것으로 여겨진다. 따라서 본 논문에서는 컴퓨터 사용에 있어서의 많은 폐해들을 기술적인 측면을 뛰어넘어 보다 근본적인 문제인 윤리의식에 초점을 맞추어 그 대응방안 및 해결책을 모색하고자 하였다. 즉, 컴퓨터 윤리의식에 대한 학자들의 많은 논쟁들을 비교분석하고 나아가 바람직한 도덕적 미래를 위해 가능하거나 필요한 현실적 노력들을 제시하도록 한다.