• 한국HCI학회:학술대회논문집
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• 2006.02a
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• pp.1298-1304
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• 2006

공급체인관리(Supply Chain Management)는 단순히 물질의 흐름관리뿐만 아니라 제품의 생산, 공급, 유통 등 다양하고 복잡한 활동들의 물질 및 정보 흐름의 통합이라고 할 수 있다. 그러므로 각 구성원간의 긴밀한 협력과 공동작업을 위해서는 원활한 정보 수집 및 응답이 요구된다. 하지만 기존 시스템은 비이동성 에이전트 개념으로 네트워크의 오버헤드나 혹은 접속 단절 상황에서 작업 수행이 불가능하여 구성원간의 정보 수집과 응답이 실제 업무 처리에 지연이 발생되므로 생산에서 판매까지의 리드타임이 길어지게 되고 채찍효과(Bullwhip Effect)가 더욱 크게 나타난다. 따라서 본 논문에서는 구성원간 협력과 공동작업을 위해 효율적으로 처리되어야 할 정보 수집 및 응답을 대상으로 하는 효율적 다중 응답을 위한 이동 에이전트 시스템을 설계한다. 제안시스템은 기존 시스템의 문제 해결을 위해 이동 에이전트와 객체 복제 메커니즘을 제시하며, 또한 각 구성원 시스템의 투명성을 위해 네이밍 서비스의 구성 방법과 등록된 구성원 시스템 객체의 객체 참조자 정보에 따라 복제된 이동 에이전트가 각 구성원 시스템으로 이주하는 이주 방식과 이주 후, 개별적인 작업 수행 결과를 해당 각 구성원 시스템에 제공하는 다중 응답 시나리오를 제시한다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.15 no.5
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• pp.91-103
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• 2015

This paper presents "The 3-User NOR switching channel based on interference decoding with receiver cooperation" in succession to "Jeju Jong Nang channel code I, II". The Jeju Jong Nang code is considered as one of the earliest human binary coded communication (HBCC) in the world with a definite "1" or "0" binary symbolic analysis of switching circuits. In this paper, we introduce a practical example of interference decoding with receiver cooperation based on the three user Jong Nang NOR switching channel. The proposed system models are the three user Jong Nang (TUJN) NOR logic switching on-off, three-user injective deterministic NOR switching channel and Gaussian interference channel (GIC) with receiver cooperation. Therefore, this model is well matched to Shannon binary symmetric and erasure channel capacity. We show the applications of three-user Gaussian interference decoding to obtain deterministic channels which means each receiver cooperation helps to adjacent others in order to increase degree of freedom. Thus, the optimal sum rate of interference mitigation through adjacent receiver cooperation achieves 7 bits.

• Journal of the Korean Data and Information Science Society
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• v.20 no.5
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• pp.809-818
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• 2009

Collaborative filtering approach predicts the preference of active user about specific items transacted on the e-commerce by using others' preference information. To improve the prediction accuracy through collaborative filtering approach, it must be needed to gain enough preference information of users' for predicting preference. But, a bit much information of users' preference might wrongly affect on prediction accuracy, and also too small information of users' preference might make bad effect on the prediction accuracy. This research suggests the method, which decides suitable numbers of neighbor users for applying collaborative filtering algorithm, improved by existing k nearest neighbors selection methods. The result of this research provides useful methods for improving the prediction accuracy and also refines exploratory data analysis approach for deciding appropriate numbers of nearest neighbors.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.22 no.4
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• pp.423-429
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• 2011

Cooperative spectrum sensing is proposed to overcome some problem such as multipath fading and shadowing and to improve spectrum sensing performance. There are different combining methods for cooperative spectrum sensing: hard decision method and soft decision method. In this paper, we analysis the performance of cooperative spectrum sensing with distance based weight that is kind of a soft decision rule for cognitive radio(CR) systems and CR systems sense the spectrum of the licensed user by using a energy detection method. Threshold is determined in accordance with the constant false alarm rate(CFAR) algorithm for energy detection. The signal of licensed user is OFDM signal and the wireless channel between a licensed user and CR systems is modeled as Gaussian channel. From the simulation results, the cooperative spectrum sensing with distance based weight combining(DWC) and equal gain combing(EGC) methods shows higher spectrum sensing performance than single spectrum sensing does. And the detection probability performance with the DWC is higher than that with the EGC.

• Proceedings of the Korea Water Resources Association Conference
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• 2015.05a
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• pp.531-535
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• 2015

본 연구에서는 한반도 관측 공백지역인 북한지역에 대하여 레이더와 위성 원격탐사자료를 활용하여 강수량과 토양수분 등 수문기상정보를 생산 및 검증하고 효율적인 수문 모니터링 및 수문 기상 재해 감시와 평가 방안을 수립하고자 한다. 또한, 북한지역의 수문 기상 정보 수집 및 통합 DB를 마련하고 북한 수문기상 포털시스템을 구축함으로써 부처 간 자료를 공유할 수 있는 매개체를 마련하여 일관된 정책 수립과 효율적인 물관리를 도모하고자 한다. WPMM(Window Probability Matching Method)방법을 기반으로 구성된 RAD-RAR(Rain rate system) 산정 알고리즘(Rosenfeld et al., 1993)을 활용하여 산출된 합성 강우장 데이터의 정확성을 비교 분석하기 위해 접경지역 AWS 강수량과 세계기상통신망(GTS)기반 강수량을 산출하여 각각 레이더 강수량과 검증분석을 실시하였다. 연구기간은 2012년과 2013년 여름철 기간 중 5개의 기간을 선별하였다. 연구 기간 동안의 RAR 합성 강우장 데이터를 이용하여, 기간 중 1시간 동안 누적된 강수량을 산출하고 접경지역 AWS 강수량과 비교하였고 12시간 누적 강수량을 산출하여 GTS 강수량과 비교 분석을 실시하였다. 전반적으로 레이더 강수량에 비해 AWS 강수량이 더 높게 나타났으며 마찬가지로 레이더 강수량과 GTS 강수량의 비를 통해 레이더 자료가 상대적으로 과소추정되고 있음을 확인 할 수 있었다. 미항공우주국(NASA)과 일본항공우주국(JAXA)을 중심으로 진행된 GPM(Global Precipitation Measurement)미션은 한 개의 핵심위성과 마이크로파 복사계를 탑재한 10여개의 보조위성으로 구성되어 있으며, 매 3시간 간격의 전구 강수량 자료 생산에 목적이 있다. 이는 홈페이지를 통해 Level 1, 2, 3의 GPM 데이터를 배포하고 있다. 특히 Level 2 데이터는 언급된 3시간 간격의 전구 강수량 데이터를 제공한다. 이 경우 복사량을 강수량으로 변환하는 번거로움을 덜 수 있으며 NASA가 제공하는 Panoply라는 프로그램을 이용하여 한반도 강수 자료 가시화가 가능하다.

• The Journal of the Korea Contents Association
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• v.18 no.11
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• pp.317-326
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• 2018

The purpose of this study is to develop an AHP model to evaluate the relative importance and priorities of multi-cultural policies under bounded Rationality. The results of the study are as follows. First, in the evaluation elements for each measurement area, the following are the stable social settlement support policy (1rank), social capability development policy of multi-cultural family second generation (2rank), socio-economic activity policy (3rank), collaborative governance policy enforcement(4rank). Second, the priority of the measurement element is as follows. social settlement service target expansion policy was proved to be the top priority project stable social settlement support policy aspect and social capacity development policies of the second generation of multi-cultural families, social support policy was most important evaluated. Active economic activity support policy was as the top priority project socio-economic activity policy, and construct cooperation system of policy practice main agents was proved to be the top priority collaborative governance policy enforcement. These results will contribute to explain the reality of multi-cultural policy.

• Smart Media Journal
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• v.9 no.2
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• pp.78-85
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• 2020

This study aims to clarify the impact of environmental issues on sustainable environmental management performance through the establishment of internal and external networks and environmental management activities. As a result of analyzing 163 final collected data of companies, social environmental issues did not have a significant effect on the internal sharing system, but they had a significant positive effect on both regulatory response and cooperation network establishment. In addition, the regulatory response to the environment has a significant effect on both the internal sharing system, cooperation network establishment, and environmental management activities. Lastly, environmental management activities have a significant impact on sustainable environmental management performance, indicating that environmental issues are leading to environmental management activities and performance by promoting sustainable growth of companies.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.22 no.6
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• pp.648-653
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• 2011

In this paper, coordinated space division multiple access(SDMA) technology is proposed to mitigate inter-cell interference by using partial channel state information in cooperative wireless communications system with limited feedback. Each AT selects an optimal cluster transmission mode and sends it back to a cluster scheduler, and at the cluster scheduler, ATs are scheduled within a AT group with the identical cluster transmission mode, and the optimal transmission mode and the corresponding scheduled ATs are determined to maximize scheduling priority. Also, in order to enhance multiuser diversity gain, an extended transmission feedback method is proposed to feed back multiple preferred cluster transmission modes at each AT. It is shown that the proposed coordinated SDMA scheme outperforms existing non-coordinated SDMA schemes in terms of the average system throughput.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.8
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• pp.1811-1819
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• 2013

In this paper, we carried out a study on how to find an appropriate helper node for cooperative communications, the role of which is very import to enhance system throughput of wireless communication system. The busy tone cooperative MAC (BT-COMAC) protocol proposed in this paper is a new cooperative MAC protocol with a reactive helper node scheme and maximizes the benefits of existing schemes while making up for their shortcomings. We conducted performance evaluation of this new protocol using computer simulation experiment. System throughput in bps and channel access delay are utilized as performance measures. We used a random way point mobility model where every communication node moves independently one another, and slow fading channel where every communication node decided its transmission rate with received power basis. Numerical results show that the new MAC protocol enhances system throughput as much as 15% of the existing scheme.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.6A
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• pp.547-554
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• 2010

Recently, the multi-band orthogonal frequency division multiplexing(MB-OFDM) system, one of UWB system, can satisfy the requirement and can be applied to various wireless communication services because ultra-wideband(UWB) is a wireless communication technique that supports high data rate with low power. In this paper, the method applying Alamouti's space time block code(STBC) and cyclic delay diversity(CDD) is proposed. The proposed method can be easily applied with arbitrary number of relays and only needs two time slots of quasi stationary assumption. And it is applied to the MB-OFDM system. Second, an optimal relaying scheme based on decode-and-forward(DF) method is proposed which is provides good error performance compared to conventional schemes.