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한지훈(Han Ji Hoon),박경배(Park Gyong Bae),곽승욱(Kwak Seung Uk),김정일(Kim Jeong II),정근원(Jeong Keun Won),송인근(Song In Keun),이광배(Lee Kwang Bae),김현욱(Kim Hyen Uk) 한국정보처리학회 1999 정보처리학회논문지 Vol.6 No.1
Uses can share information and use resources effectively by using TCP/IP-based networks. So, a protocol to manage complex networks effectively is needed. For the management of the distributed networks, the SNMP(Simple Network Management Protocol) has been adopted as an international standard in 1989, and the SNMPv2 in which a security function was added was published in 1993. There are two encryption schemes in SNMPv2, the one is a DES using symmetric encryption scheme and the other is a MD5(Message Digest5) hash function for authentication. But the DES has demerits that a key length is a few short and the encryption and the authentication is executed respectively. In order to solve these problems, we use a RSA cryptography in this paper. In this paper, we examine the items related with SNMP. In addition to DES and MD5 proposed in SNMPv3, we enhance security functionality be adopting RSA, a public key algorithm executing the encryption and the authentication simultaneously. The proposed SNMPv3 security module is written in JAVA under Windows NT environment.
철도 시설물 자동화 계측을 활용한 경보 전파 시스템 개발
정재현(Jung Jea Hyen),김현기(Kim Hyun ki),한상재(Han Sang Jea),정승용(Jung Seung Yong) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
현재 국토해양부에서는 건설교통재난ㆍ재해대책편람을 발간하여 철도를 포함한 국가 주요 시설물에 대한 재난 대응지침을 수립한바 있으나, 지령 및 상황전파를 전화나 팩스등에 의존하고 있어 업무 전달 속도가 현저히 느리고 인력중심의 안전관리 업무처리로 인해 상황발생 시 신속한 대응이 어려운 실정에 있다. 또한 이러한 실정과 유사하게 철도관련 토목공사 및 유지관리 부문에서도 센서기반 자동화 계측 시스템을 상당수 도입하고 있으나, 운영되고 있는 대부분의 시스템은 계측데이터를 분석하고 시설물 내부 위험을 평가하여 관리주체에 보고 및 전달시간이 상당한 소요되고, 긴급하게 시설물 이상여부를 보고해야 하는 상황에 자동화 계측시스템이 경보 전파를 적절하게 발휘하지 못하는 경우가 비번하게 발생한다. 따라서, 본 논문에서는 기존 철도 토목관련 자동화 계측 경보전파체계에 관한 문제점을 파악하여, 국부단일 토목공사의 단위 계측시스템 뿐만 아니라, 철도에서 활용되기에 적합한 체계로 경보 전파 자동화 시스템을 제안하고, 나아가 국가 기반시설물 안전관리에 연계ㆍ활용 될 수 있도록 상황전파 표준 프로토콜 및 전파시스템을 제안하고자 한다. Gathering information and systemization of infrastructure disaster management is to reduce uncertainties in making decisions and maximize the number of alternations for reasonable decision making. The key object is the progress report & propagation automation system based on sensors of railway, which is major for providing objective data to realize and support decision makings and delivering decision to a certain area, department, manager and other people rapidly. Collecting, reviewing and database of existing progress report & propagation manual in order to achieve networking of safety management on major social infrastructure of the nation, materialization of field-oriented intelligent business process by developing mobile safety management command transmission device and integrating it into facility safety management network.
Guk, Hyein,Kim, Daejin,Choi, Seung-Hoon,Chung, Dong Hyen,Han, Sang Soo The Electrochemical Society 2016 Journal of the Electrochemical Society Vol.163 No.6
<P>The lithium ion batteries (LIBs) are the most widely used power source for portable electronic devices, and the performance of the LIBs needs to be improved for the electrical vehicles and mobile devices. The formation of the stable solid-electrolyte interface (SEI) layer is closely related to Columbic efficiency and long cycle life of battery so the stable SEI layer is essential to the performance of the LIBs. To suggest an artificial SEI layer model that improves the stability of the LIBs, we performed the molecular dynamics simulation using the reactive force field. The artificial SEI layer model (PEO-graphite) was generated from the reaction between the graphite edge plane functionalized with hydroxyl groups and ethylene oxides, thereby having PEO-like polymers covalently linked to the graphite edge plane. The solvation number of Li+ and thermal stability of the SEI layer were investigated to understand the characteristics of the PEO-graphite. The analysis results show that the PEO-graphite effectively prevents the co-intercalation of the solvents into the graphite, and the covalent bonds between PEO polymers and the graphite edge plane provide excellent thermal stability to the PEO-graphite compared to the graphite physically coated with the polymers. (C) 2016 The Electrochemical Society. All rights reserved.</P>