• 한국산학기술학회논문지
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• 제12권7호
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• pp.3275-3279
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• 2011

유무선망 상호접속 서비스 제공을 통한 통화요금의 사업자별 배부가 서비스 설비원가에 의하여 많은 부분이 정의되는 점을 고려한다면 망 설비를 통하여 제공되는 서비스들의 통화량 기준에 의한 평가가 이루어져야 한다. 이러한 관점에서 이동통신망 설비를 음성, 데이터서비스를 위한 전용설비와 공통설비로 구분하고, 공통설비는 합리적 기준에 의한 서비스별 설비원가의 배부 방법의 도출이 필수적이다. 본 논문에서는 유럽 GSM 시스템에서 이용되고 있는 이동통신망 공통설비 원가 배부 방안 분석을 통하여 국내 CDMA 이동망의 공통설비 원가 배부를 위한 회선 음성 서비스와 패킷 데이터서비스간의 단일 통화량으로 계측하기 위한 서비스간 환산계수 방안을 도출하였다.

• 한국데이타베이스학회:학술대회논문집
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• 한국데이타베이스학회 2010년도 춘계국제학술대회
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• pp.181-185
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• 2010

The current method for accessing interconnection charges in Korea, called a hybrid model in this paper, mixes a top-down with a bottom-up LRIC model. The method has given stable charges so far. However, according to the fundamental changes of the market, policy, and network technology in the telecommunications industry, it requires analyzing the validity of the method. We investigate the problems of the top-clown, bottom-up, and hybrid model used in Korea and analyze their effect on regulation policy.

• 전기의세계
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• 제31권5호
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• pp.355-360
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• 1982

In numerical computation, it is desirable to access any row or column, the main diagonal, subarrays, of a matrix without any conflict for successful parallel processing. To meet this requirement special storage scheme is used for conflict-free access of necessary data. Interconnection network, which connects processing elements and processing element memory modules, is required to execute the necessary operations. In this paper we discuss the skewing method for conflict-free, access to various bit slices and single-stage interconnection networks.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 A
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• pp.417-419
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• 2005

This paper presents the effects and the regional power distribution of an increase or a decrease of a power reserve by load flow calculations under seasonal load patterns of each country for the future power shortages faced by the metropolitan areas or by the southeastern area of the South Korea in North-East Asia. In these connections, the types of a power transmission for interconnection consist of the 765kV HVAC and the HVDC. In this paper, the various cases of the power system interconnections in Far-East Asia are presented, and the resulting interconnected power systems are simulated by means of a power flow analysis performed with the PSS/E 28 version tool. The power flow map is drawn from data simulated and the comparative study is done. In this future, a power flow analysis will be considered to reflect the effects of seasonal power exchanges And the plan of assumed scenarios will be considered with maximum or minimum power exchanges during summer or winter in North-East Asia countries.

• 마이크로전자및패키징학회지
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• 제22권1호
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• pp.1-5
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• 2015

Recently, data throughput of smart electric devices increases dramatically. There is a great interest in a new technology which exceeds the limit of electrical transmission method. Optical PCB can supplement the weakness of electrical signal processing, the research for optical PCB is very active. In this paper, we propose the thermal imprint lithography process to fabrication optical layer of optical PCB and experiment to optimize the process conditions. We confirm process time, pressure, process temperature, demolding temperature and fabricate optical interconnection structure which has $45^{\circ}$ tilted mirror surface for confirm the interconnection efficiency.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 춘계학술대회 논문집 전력기술부문
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• pp.103-107
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• 2001

This paper presents a proposal for the power system interconnection alternative between the South and North Korea. The characteristics of bus voltage and power flow are analized to see the feasibility of the proposed and to evaluate the voltage atability. We collect and estimate various data of the South and North Korea power network. and the various case studies using the PowerWorld simulator were made to find the aceeptable interconnection alternative.

• 한국통신학회논문지
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• 제14권6호
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• pp.675-685
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• 1989

상호접송망은 병렬처리 시스템에서 매우 중요한 부분이다. 최근 다단상호 접속망에 대한 연구가 많이 행해지고 있다. 본 논문에서는 회선스위칭 다단상호접속망의 시뮬레이션 방법을 확장하여 분할된 ADM/IADM 접속망의 성능 평가를 하였다. 시뮬레이션 데이터에 의하여, 적용된 분할 방법에 의한 접속망 성능과 접속망에서 사용된 저지처리방식에 의한 접속망 성능 간의 관계를 보였다. 분석 결과, hold 방식을 사용하는 IADM 접속망이 RST 면에서 가장 나은 접속망 동작을 보이는 것으로 나타났다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권8호
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• pp.3946-3965
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• 2018

Network anomaly detection in Software Defined Networking, especially the detection of DDoS attack, has been given great attention in recent years. It is convenient to build the Traffic Matrix from a global view in SDN. However, the monitoring and management of high-volume feature-rich traffic in large networks brings significant challenges. In this paper, we propose a moving window Principal Components Analysis based anomaly detection and mitigation approach to map data onto a low-dimensional subspace and keep monitoring the network state in real-time. Once the anomaly is detected, the controller will install the defense flow table rules onto the corresponding data plane switches to mitigate the attack. Furthermore, we evaluate our approach with experiments. The Receiver Operating Characteristic curves show that our approach performs well in both detection probability and false alarm probability compared with the entropy-based approach. In addition, the mitigation effect is impressive that our approach can prevent most of the attacking traffic. At last, we evaluate the overhead of the system, including the detection delay and utilization of CPU, which is not excessive. Our anomaly detection approach is lightweight and effective.

• 전기학회논문지
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• 제58권9호
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• pp.1681-1688
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• 2009

This paper proposes a new fault restoration method which adopts the recloser as top agent to release the problems of the data concentration and fault processing delay of the existing DAS(distribution Automation System) under the ubiquitous distribution system. In proposed method, top agent collects the data based on the multi-casting communication with the tie switches of the interconnection point, and then selects a closed switch(tie switch) to transfer the sound outage load to other feeders based on the heuristic search strategy step by step until the load transfer work is finished. Here, a new heuristic rule is developed which can guarantee the relational load balancing and line loss from the collected voltage data. Finally, the several faults are simulated for typical multi-section and multi-interconnection distribution system to prove the effectiveness of the proposed strategy, in particular, for each simulation cases, the load balancing index and line loss index of the obtained solution from the proposed method is compared with those of all of feasible solutions.

• 한국정보과학회논문지:정보통신
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• 제29권6호
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• pp.738-748
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• 2002

본 논문에서는, ${\alpha}{\times}{\alpha}$ 출력 버퍼 스위치로 구성된 다단 연결 망(Multistage Interconnection Network, MIN)의 성능 예측 모형을 제안하고, 스위치에 장착된 버퍼의 개수 증가에 따른 성능 향상 추이를 분석하였다. Buffered 스위치 기법은 다단 연결 망 내부의 데이타 충들 문제를 효과적으로 해결할 수 있는 방법으로 널리 알려져 있다. 제안한 성능 예측 모형은 먼저 네트웍 내부 임의 스위치 입력 단에 유입되는 데이타 패킷이 스위치 내부에서 전공되는 유형을 확률적으로 분석하여 수립되었다. 제안한 모형은 스위치에 장착된 버퍼의 개수와 무관하게 출력 버퍼를 장착한 ${\alpha}{\times}{\alpha}$스위치의 성능, 즉 네트웍 성능 평가의 두 가지 주요 요소인 네트웍 정상상태 처리율(Normalized Throughput, NT)과 네트웍 지연시간(Network Delay)의 예측이 가능하고, 나아가서 이들로 구성된 모든 종류의 다단 연결 망 성 분석에 적용이 용이하다. 제안한 수학적 성능 분석 연구의 실효성 검증을 위하여 병행된 시뮬레이션 결과는 상호 미세한 오차 범위 내에서 모형의 예측 데이타와 일치하는 곁과를 보며 분석 모형의 타당성을 입증하였다. 또한, 분석 결과 스위치 내부에 많은 버퍼를 장착할수록 정상상태 처리율의 증가율은 감소하고, 네트웍 지연시간은 증가하는 것으로 나타났다.