• Proceedings of the CALSEC Conference
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• 2001.02a
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• pp.31-35
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• 2001

□ 정보 단절로 인한 업무 Loss제거 □ 공정하고 투명한 업무 Process 기대 □ 다양한 형태의 정보공유방법 요구 □ 기존 시스템의 본부별 이질화 □ 협력회사 사용 시스템이 분산 □ e-SCM 실행 전략 Model접근 선택 -e-Procurement로의 Transform요구 □ Analog에서 Digital 기업으로의 변경요구 □ 고객 중심적 Business 전환 □ 정보를 실시간으로 공유할 수 있는 기술 e-Procurement 체제로의 업무 전환 o 사용자 위주의 시스템 구현 o 업무단위별 2way 실현으로 효율증진 o 상호 실시간 정보공유를 통한 win-win 실현 o 신뢰성/투명성 제고 o 협력회사용 접속 Channel Portal화 Paperless ＆ Real Time(중략)

• Journal of Korea Society of Industrial Information Systems
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• v.20 no.4
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• pp.1-9
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• 2015

This paper proposes CAC method that is more efficient for RRM using game theory combined with Multiple Attribute Decision Making(MADM). Because users request services with different Quality of Service(QoS), the network preference values to alternative networks for each service are calculated by MADM methods such as Grey Relational Analysis(GRA), Simple Additive Weighting(SAW) and Technique for Order Preference by Similarity to Ideal Solution(TOPSIS). According to a utility function representing preference value, non-cooperative game is played, and then network provider select the requested service that provide maximum payoff. The appropriate service is selected through Nash Equilibrium that is the solution of game and the game is played repeated. We analyze two overlaid networks among four Wireless LAN(WLAN) systems with different properties. Simulation results show that proposed MADM techniques have same outcomes for every game round.

• Journal of Internet Computing and Services
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• v.12 no.6
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• pp.35-42
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• 2011

Cooperative relay communication for wireless networks has been extensively studied due to its ability to mitigate fading effectively via spatial diversity. In this paper, we propose a balanced transmit scheme in cooperative relay communication with decode-and-forward DF) scheme. The proposed scheme selects the feedback bits to obtain the maximum cooperative diversity gain. The simulation results show that the proposed scheme improves the bit error rate BER) performance as compare with a conventional scheme.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38C no.1
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• pp.64-77
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• 2013

In this paper, we propose a joint bandwidth allocation and path selection scheme for IEEE 802.16j networks in uplink with cooperative relaying, and we evaluate the performance of the proposed scheme by using OPNET based simulation in hilly terrain with heavy tree density. The proposed scheme maximizes the system throughput in uplink with cooperative relaying in IEEE 802.16j networks. Then, we transform the proposed scheme into multi-dimensional multiple choice knapsack problem (MMKP) based scheme. We also propose uplink throughput maximization scheme and MMKP based scheme without cooperative relaying. We show that the system throughput of the proposed MMKP based scheme is higher than that of link quality based scheme, and cooperative relaying provides higher system throughput than the conventional case without cooperative relaying in uplink.

• Journal of KIISE:Software and Applications
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• v.30 no.3_4
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• pp.239-250
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• 2003

Recent recommender system user a method of combining collaborative filtering system and content based filtering system in order to slove the problem of the Sparsity and First-Rater in collaborative filtering system. In this paper, to make up for the prediction accuracy in hybrid Recommender system, the harmonic mean weight(CBCF_harmonic_mean) is used for calculating the user similarity weight. After setting up the threshold as 45 considering the performance of content based filtering, we apply significance weight of n/45 to user similarity weight. To estimate the performance of the proposed method, it if compared with that of combing both the existing collaborative filtering system and the content- based filtering system. As a result, it confirms that the suggested method is efficient at improving the prediction accuracy as solving problems of the exiting collaborative filtering system.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2010.11a
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• pp.278-281
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• 2010

협력 통신을 위한 프로토콜로 제안된 Hybrid relaying은 Source로부터 relay로 전송된 정보의 복호 성공 여부에 따라 증폭 후 전송 (AF) 기법과 복호 후 전송 (DF) 기법을 선택적으로 이용하여 전송한다. 최근 초고속 근거리 무선통신을 위한 테라 헤르츠 대역의 반송파를 이용한 연구가 활발해 지면서 Rician fading 채널 기반의 통신 기법 연구들이 중요 해 지고 있다. 본 논문에서는 각 노드간의 채널환경이 Rician fading 으로 모델링 되는 경우에 Hybrid relaying을 이용한 협력통신 기법의 outage probability를 분석한다.

• Journal of Satellite, Information and Communications
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• v.8 no.4
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• pp.1-5
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• 2013

CR(Cognitive Radio) technology is maximized frequency reuse using unused frequency band. Conventional cooperative spectrum sensing has fixed false alarms. so all cooperative user has equal threshold. This problem is caused degradation of detection probability. so we propose and analysis the system model that false alarm differential setting through CSI(channel state information) for resonable threshold. Simulation results show improvement of detection probability.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.9 no.1
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• pp.95-101
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• 2009

Wireless Sensor Network (WSN) has limited power and bandwidth. In order to high data rate and high speed communication systems are required. Cooperative communication system can help to decrease power consumption through spatial diversity. In cooperative transmission, one partner node assists one sensor node to transmit their data to destination. Instead of using M partners for M sensor nodes, we propose 1 partner for M sensor nodes. And we proposed relay selection scheme base on ARQ. Proposed protocol offers higher diversity order as conventional one with much less bandwidth and power. The destination will consider the one packets received from the best relay to reduce the complexity of the system. We verified BER performance for the proposed protocol through Monte-Carlo simulation over Rayleigh fading plus AWGN.

• The Magazine of the IEIE
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• v.38 no.8
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• pp.27-32
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• 2011

ISO/IEC와 ITU의 비디오 압축 공동협력팀(Joint Collaborative Team on Video Coding - JCTVC)은 차세대 비디오 압축 표준인 HEVC (High Efficiency Video Coding)를 표준화 중이다. JCTVC에서 제안된 핵심기술들 중 하나인 변환 기술은 크게 핵심 변환 커널 설계 기술과 선택적 변환 기술로 나누어 표준화가 진행되고 있다. 본 논문에서는 변환 방법과 관련된 채택된 기술들을 설명하고, 현재 진행 중인 변환관련 표준화 참여 기술들을 소개한다.

• Proceedings of the IEEK Conference
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• 2008.06a
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• pp.221-222
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• 2008

We propose a LLR (log-likelihood ratio) selection combining technique that reduces much of complexity. This technique chooses the most reliable branch based on the magnitude of the LLR of each branch. We show that the proposed selection combining achieves significant power gains over conventional selection combining and nearly matches the performance provided by MRC.