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이동 IPv6 VPN 환경에서 이동 노드의 이동성 보장을 위한 IPSec SA동기화에 관한 연구
元裕憲,張成敏 弘益大學校 科學技術硏究所 2005 科學技術硏究論文集 Vol.16 No.-
This paper presents a reducing IPSec delay scheme of a Mobile Node and VPN(Virtual Private Network) gateway using a efficient and secure IKEv2(Internet Key Exchange) message. When the Mobile Node changes its CoA(Care-of-Address), it re-establish all SA(Security Association) with the VPN gateway. Creating new SAs often also involves expensive calculations , possibly a large number of roundtrips in the Mobile IPv6 environment. In the proposed scheme, We extend the IKEv2 message to updates the IP addresses associated with the IPSec SA(Security Association)s. In this way, our scheme reduces a IPSec delay resulted from an SA re-negotiation.
원유헌,하수철 한국정보과학회 1985 한국정보과학회 학술발표논문집 Vol.12 No.2
본 논문은 기존의 상업 처리용 언어인 COBOL에서 한글 사용의 제약을 배제하고, COBOL 프로그램에서 한글 보고서를 용이하게 작성할 수 있도록 하기 위한 한글 보고서 작성 시스템의 설계와 구현을 제시하였다. 이 보고서 작성 언어는 기존 COBOL 프로그래머가 거부감 없이 쉽게 사용할 수 있도록 기존 COBOL 언어의 특징들( features )은 그대로 두고, 단지 Report Writer 부분과 자료형 선언과 연산에서 한글 또는 한자를 의미하는 자료형으로 H형만을 도입함으로써, COBOL 프로그래머로 하여금 연산 및 입출력에서 한글 사용의 제약을 벗어날 수 있도록 하였다. 이 보고서 작성 언어는 Unix 기반의 M8000에 구현 하였는데, 목적 언어를 RM/COBOL로 하는 프리프로세서 기법을 사용하여 C언어로 개발하였다.
元裕憲 弘益大學校 1984 弘大論叢 Vol.16 No.2
We have developed a simulator program which permits the PDP-11 computer system to simulate the 200 User Terminal(UT-200). The simulator program consists of 9-main body module programs, 7-interrupt handling routines, and 20-subroutines with 6k bytes of program and 5k bytes of input-output buffer. The simulator developed in this paper reduces the CPU load of main body, decreases the cost of the terminal system, and increases the flexibility compared with existing hardware terminal systems.
한글 사용의 제약을 배제한 Report Writer의 설계와 구현
元裕憲 弘益大學校 1985 弘大論叢 Vol.17 No.2
This paper shows a design of the COBOL Report Writer which support Hangul and Chinese characters simultaneously. It is implemented in M8000 systems with RM COBOL using preprocessor method coded by C-language. This Report Writer Feature permits the programming to specify the format of printed report in the Data Division without any restrictions of Hangul and Chinese characters, thereby minimizing the amount of Procedure Division coding which the programmer would have to write to create the report including Hangul.
元裕憲 弘益大學校 1987 弘大論叢 Vol.19 No.2
This paper shows a design of the VLSI Hardware Description Language(called INCL) intended for the easy VLSI design using a high level language. Most of this language features follow the ICL features as a predecessor language and includes the Syntax and concepts of PASCAL language. It is implemented in IBM PC/AT systems with - Auto CAD system. This INCL System generates a symbolic layout corresponding to the descriptions of the logic circuit described using this INCL language.
元裕憲,金鍾珍,吳亨俊 弘益大學校 科學技術硏究所 2003 科學技術硏究論文集 Vol.14 No.-
There has been a movement to adopt satellite communication network to replace the current earth mobile network in order to provide advanced communication system. In previous researches, the capacity of channel within the cell has been determined by numbers of terminals no matter what the density either the distribution of the terminals are. The work described in this paper is firstly aimed at analyzing C/I differences and changes within the same cell and other cell with various densities of terminals under a satellite in a low orbit. With this research, this paper is consequently aimed to provide an algorithm which can help enhancing the efficiency of satellite communication network by applying the analyzed data.
김현배,조강명,원유헌 弘益大學校 科學技術硏究所 1995 科學技術硏究論文集 Vol.6 No.-
The BLP security model is a formal descritiption of the allowable paths of information flow in a securie system. The properties of BLP security model for secure flow of information are simple security property and *-property. However, it did not consider the the integrity of data. In this paper, the abstract security model to enforce security and integrity was introduced. The properties of the abstract model are consisted of read property, write property, and create property. They were modified from BLP security model to enforce integrity. The abstract security model was implemented on Linux system by adding MAC (Mandatory Access Control) function to the kernel which is responsible for file management.. MAC function satisfies the properties of the abstract model.
멀티미디어 스트림 처리를 위한 효율적인 프록시 캐슁 기법
元裕憲,朴淳東,尹鐵柱 弘益大學校 科學技術硏究所 2000 科學技術硏究論文集 Vol.11 No.-
The growth of the internet in the past few years has led to network congestion and server overloading. Use of proxy cache solve this problem. Despite success of proxy cache in the internet, proxy cache is not efficient for multimedia stream such as video and audio. In this paper, we propose a new proxy cache policy and a efficient cache replacement algorithm for multimedia stream. We expect that a new proxy cache policy is efficient for multimedia stream.