SNMP를 이용한 엔터프라이즈 Network Weather Map 시스템

김명섭,김성윤,박준상,최경준,Kim, Myung-Sup,Kim, Sung-Yun,Park, Jun-Sang,Choi, Kyung-Jun 한국정보처리학회 2008 정보처리학회논문지 C : 정보통신,정보보안 Vol.15 No.2

The network weather map and bandwidth time-series graph are popularly used to understand the current and past traffic condition of NSP, ISP, and enterprise networks. These systems collect traffic performance data from a SNMP agent running on the network devices such as routers and switches, store the gathered information into a DB, and display the network performance status in the form of a time-series graph or a network weather map using Web user interface. Most of current enterprise networks are constructed in the form of a hierarchical tree-like structure with multi-Gbps Ethernet links, which is quietly different from the national or world-wide backbone network structure. This paper focuses on the network weather map for current enterprise network. We start with the considering points in developing a network weather map system suitable for enterprise network. Based on these considerings, this paper proposes the best way of using SNMP in constructing a network weather map system. To prove our idea, we designed and developed a network weather map system for our campus network, which is also described in detail. 네트워크사업자, 인터넷 사업자, 및 엔터프라이즈 네트워크의 트래픽 현황을 파악하기 위한 방법으로 Network Weather Map (NWM)과 대역폭 시간추이 그래프를 많이 사용한다. 이들은 라우터나 스위치장비 내에 동작하는 SNMP 에이전트가 제공하는 MIB정보를 주기적으로 수집하여 DB에 저장하고, 사용자가 언제 어디서나 볼 수 있도록 웹으로 결과를 보여주는 형태로 구축된다. 현재의 엔터프라이즈 네트워크는 multi-Gbps를 지원하는 이더넷 스위치 중심의 트리 토폴로지 형태로 구축되고 있다. 본 논문은 현재의 엔터프라이즈 네트워크에 적합한 SNMP 기반의 Network Weather Map 구축에 있어 고려되어야 할 사항을 점검하고, 이를 바탕으로 엔터프라이즈 Network Weather Map 시스템을 설계하고 구현한 내용을 기술한다. 특히 엔터프라이즈 네트워크와 Core 네트워크의 토폴로지 상의 차이를 고려하여 효율적인 Network Weather Map 디자인을 제시하고, multi-Gbps 고속 링크를 지원하는 현재의 라우터/스위치장비에 SNMP MIB-II 사용의 문제점을 확인하고 이의 해결방안을 제시한다. 또한 SNMP의 사용에 따른 트래픽 발생량, 그리고 네트워크 장비의 부하를 조사함으로써 SNMP의 효율적 사용방법을 제시한다. 본 논문에서는 학교 캠퍼스 네트워크를 대상으로 Network Weather Map 시스템을 구축하였다.

네트워크 이동 환경에서의 TCP 성능 향상 기법

김명섭,최명환,Kim Myung-Sup,Choi Myung-Whan 한국정보처리학회 2006 정보처리학회논문지 C : 정보통신,정보보안 Vol.13 No.3

인터넷과 이동 네트워크로 구성된 유무선 통합 네트워크에서는 인터넷 상의 송신자와 이동 네트워크 상의 이동 호스트(MH, Mobile Host) 간 경로는 두 개 이상의 무선링크로 구성된다. 이와 같은 네트워크 이동 환경에서 TCP의 종단간 제어 특성을 유지하면서 무선링크에서의 패킷 전송 오류로 인한 TCP의 성능 저하를 극복하는 방안을 제안한다. 제안하는 방안에서는 수신된 패킷의 시퀀스 번호와 ACK 번호를 근거로 하여 무선링크 상에서의 전송 오류로 인한 패킷 손실 정보를 추출하고 이 정보를 상류의 라우터에게 전달함으로써 상류의 액세스 라우터나 이동 라우터에서 신속히 손실된 패킷을 재전송할 수 있도록 한다. 제안하는 방안은 상류 무선링크에서의 패킷전송 오류를 신속히 극복하는 특성을 가지며 모의실험을 통하여 제안한 방안의 TCP 전송률 성능을 평가하였다. TCP 종단간 제어 특성을 가지며 송신자나 수신자 측에 추가 기능이 요구되지 않는 snoop 방식과 비교할 때 제안하는 방안의 TCP 성능이 크게 개선됨을 모의실험을 통해 확인하였다. In the integrated wired/wireless network which consists of the Internet and moving networks, multiple wireless links are used to connect a fixed host(FH) in the Internet to a mobile host(MH) in the moving network. For use in such an environment, we propose a scheme to overcome the TCP performance degradation due to the packet losses over the wireless links without losing the end-to-end TCP semantics. The proposed scheme in each mobile router(MR) allows to obtain the information regarding packet losses over the upstream wireless links based on the received packet sequence number and the ACK number. This information is delivered to the upstream router, which enables the upstream access router(AR) or MR to quickly retransmit the lost packets. The proposed scheme has the feature to quickly recover the packet losses incurred over the upstream wireless links and the performance of the proposed scheme is evaluated through simulation. It is shown that the significant performance gain can be obtained using the proposed scheme compared with the snoop mechanism which maintains end-to-end TCP semantics and does not require any additional features at the source and/or destination nodes.

SNMP 기반의 Enterprise Network Weather Map 시스템

김명섭(Myung-Sup Kim),김성윤(Seong-Yun Kim),박준상(Jun-Sang Park),김재성(Jae-Seong Kim) 한국통신학회 2007 한국통신학회 학술대회논문집 Vol.2007 No.7

한국 대학생의 대미(對美)인식

김명섭(MYUNG-SUP KIM),최준영(JunYoungChoi) 21세기정치학회 2004 21세기 정치학회보 Vol.14 No.2

The purpose of this study is to test empirically various hypotheses related to the factors influencing the level of trust among Koreans on the United States based on a nation-wide survey on college students. In order to test the hypotheses, this study employs multiple regression analysis. The results acquired by the regression analysis indicate that the following factors have statistically significant impacts on the level of trust on the United States: ideological Anti-Americanism, short and long term impacts caused by activities of the United States, opinions on North Korea, globalization, and American pop cultures. However, the opinion on China, the level of nationalism, and the exposition to the Anti-American education turn out to have statistically insignificant impacts on the level of trust. Based on these results, the following suggestions are offered in order to retard the current diffusion of the Anti-Americanism among Koreans and to regenerate solid and mutual trust between South Korea and the United States. First, it is necessary for the two countries to materialize a counter discourse neutralizing negative effects of the ideological Anti-Americanism. Second, it is very crucial to solve differences of opinion between the two countries about how to deal with North Korea. Third, the two countries should go great length to improve images of the U.S. Force among Koreans and to come up with a Post-Cold-War rationale for its stationing in the Korean peninsular. Last, both of two countries should make more efforts to change the conviction imbedded in the minds of many South Koreans that globalization and Americanization are just two sides of the same coin.

‘재일조선인’과 ‘재일한국인’

김명섭(MYUNG-SUP KIM),오가타 요시히로(OGATA Yoshihiro) 21세기정치학회 2007 21세기 정치학회보 Vol.17 No.3

In this paper, we reconsider the conceptual opposition and division between Zainichi Chosen-jin and Zainichi Kankoku-jin structure. While both of them can be translated in English as Koreans in Japan, there exist a deep-rooted political gap between these two concepts. From a political-historical viewpoint, this paper is providing a basic study for exploring an alternative concept which can overcome the political gap of these two concepts. Towards a new terminological consensus, this paper is arguing that the emergence of hybrid identity among Koreans in Japan and the erosion of the nation-states in East Asia should be taken into account in this era of globalization. Firstly, going back to the colonial period (1910-1945), this paper investigate the origins of the concept of Zainichi Chosen-jin. Secondly, looking back at the period of the Korean Empire (1897-1910), this paper also revisit the concept of ‘Zainichi Kankoku-jin.’ Finally, this paper is paying attention to the increasingly complex identity of Koreans in Japan by taking into consideration of the categories such as new-comers and Koreans naturalized as Japanese citizens, who are relatively less bound by the ‘negative history.’ ‘Zainichi Chosen-jin’ (in a wider sense) was the name given originally to the Korean diaspora in Japan based upon their ethnic identity, and thus is a concept which transcends the confinement of the nation-state. However, as the concept of ‘ROK nationals in Japan(Zainichi Kankoku-jin)’ emerged with the founding of the ROK as a lawful government in 1948, the concept of ‘DPRK nationals in Japan’ also appeared. After the 1990s, and in the subsequent era of globalization, the number of ‘new-comers’ and Koreans naturalized as Japanese citizens has increased. Under the new changing circumstances, a need to build a terminological consensus on naming ‘Koreans in Japan’ becomes ever more urgent and compelling.

세계시민주의 대 애국주의

김명섭(MYUNG-SUP KIM) 21세기정치학회 2008 21세기 정치학회보 Vol.18 No.3

This paper deals with the political implications of the worldwide theoretical debate on cosmopolitanism versus patriotism. First of all, on the universality which is central to cosmopolitanism, this paper conceptualizes four different categories of universality with regard to the concept of nation; imperial, anarchical/anti-national, international, and transnational. Different categories of universality are determined by ongoing struggles among various spatio-temporal spheres. Patriotism in the modern Western world, often tainted by racism, imperialism, and Eurocentrism, has resulted in two World Wars of the 20th Century. The war trauma that followed has tended to regard patriotism as the original sin of modern Europe. Japanese patriotism was no exception to this European experience. Patriotism, however, still has many positive aspects, especially in Northeast Asia which had previously put up with European imperial universality. Patriotism in Northeast Asia has been closely linked to the modern nation-building process which is still ongoing. It might be also an incubator for, rather than an obstacle to, cosmopolitanism which is not yet mature enough to cope with unbridled global capitalism in Northeast Asia.

문화적 프로젝트로서의 유럽통합과 독일의 문화정책

김명섭(MYUNG-SUP KIM),홍익표(Hong Ickpyo) 21세기정치학회 2006 21세기 정치학회보 Vol.16 No.1

The purpose of this article is to explore the features and structures of the European integration as a cultural project bringing into focus the German cultural policy. The cultural policy within the European framework endows the EU with a sense of solidarity based on identity, becomes the foundation of the European project. Germany playing a leading role in integrating the Europe is unique amongst the nations of the EU in the sense that it is federally organized and decentralized. The cultural policy of Germany is largely anchored in the cultural democracy which takes account of equal access to cultural life. But there is a conflict between the efforts to consolidate 'Bürgerrecht Kultur' and the development of cultural policy founded on liberalised economy.

공동주택 구매결정요인 분석에 관한 연구

김명섭(Kim Myung-Sup),여홍구(Yuh Hong-Koo) 대한국토·도시계획학회 2009 國土計劃 Vol.44 No.3

한반도 서해 NLL의 기원과 정치적 성격

김명섭(MYUNG-SUP KIM) 21세기정치학회 2013 21세기 정치학회보 Vol.23 No.2

As the map attached to the Korean Armistice Agreement, signed on 27 July 1953, had no line drawn in the Yellow Sea, some have insisted that there is no agreed-upon MDL(Military Demarcation Line) in the Yellow Sea, and that the so-called Northern Limit Line was unilaterally declared by the Commander-in-Chief, United Nations Command. While others are convinced that the line is an inalienable territorial border. With these two arguments in mind and based on some newly discovered maps related to this question and the records of the Korean armistice talks from 1951 to 1953, this article reinterprets the NLL in the Yellow Sea as a maritime component of the Korean MDL, which was shaped by the Korean armistice talks. In these talks, the “waters” between the islands under the control of the U.N. forces and the coastal line under the control of the Communist forces was mentioned as “the best demilitarized zone.”

통계 시그니쳐 기반 트래픽 분석 시스템의 성능 향상

박진완,김명섭,Park, Jin-Wan,Kim, Myung-Sup 한국정보처리학회 2011 정보처리학회논문지 C : 정보통신,정보보안 Vol.18 No.4

네트워크의 고속화와 다양한 서비스의 등장으로 오늘날의 네트워크 트래픽은 복잡 다양해지고 있다. 효율적인 네트워크 관리를 위해서는 네트워크에서 발생하는 트래픽에 대한 다양한 분석이 필요하다. QoS, SLA와 같은 정책을 적용하기 위해서는 트래픽 분석 중에서도 트래픽 분류의 중요성이 크다. 현재까지 트래픽 분류에 관한 연구가 활발히 진행되어 왔는데 최근에는 플로우의 통계 정보를 이용한 트래픽 분류 방법론이 많이 연구되고 있다. 본 논문에서는 기존 연구에서 제안한 페이로드 크기 분포를 이용한 트래픽 분류 방법의 문제점인 낮은 분석률 및 정확도를 향상시키는 방법을 제안한다. 본 논문에서 제안하는 방법은 PSD 충돌로 인해 분류하지 못하는 트래픽을 IP와 port정보를 이용하여 추가적으로 분류하여 분석률을 향상시키고 기존 분류 방법에서 트래픽 분류를 위해 사용되던 플로우와 시그니쳐 사이의 거리 측정 방법을 벡터 거리 측정에서 패킷 별 거리 측정으로의 변경으로 통해 분류 방법의 정확도를 향상시킨다. 제안한 방법은 학내 망에서의 실험을 통해 기존 알고리즘에 비해 향상된 알고리즘의 성능을 검증한다. Nowadays, the traffic type and behavior are extremely diverse due to the appearance of various services on Internet, which makes the need of traffic identification important for efficient operation and management of network. In recent years traffic identification methodology using statistical features of flow has been broadly studied. We also proposed a traffic identification methodology using payload size distribution in our previous work, which has a problem of low completeness. In this paper, we improved the completeness by solving the PSD conflict using IP and port. And we improved the accuracy by changing the distance measurement between flow and statistic signature from vector distance to per-packet distance. The feasibility of our methodology was proved via experimental evaluation on our campus network.