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이길홍 서울産業大學校 2001 논문집 Vol.52 No.1
광 데이터 통신망은 현재의 전송망을 대치할 믿을 만한 새로운 기술로 받아들여지고 있다. 현재 WAN 영역에서는 WDM 기반 광 버스트 스위칭 기술이 연구되고 개발되고 있는 단계이다. LAN 영역에서는 중간에 지연이 적은 처리를 요구하는 간단하면서도 효율적인 전송시스템이 필요하다. 본 논문에서는 WDM 기반 LAN 환경에서 단말의 구조를 단순화시킨 간단한 동작 메커니즘을 제시한다. 시뮬레이션 결과를 제시하고 구현 환경에 대한 논의도 함께 다룬다. Optical data network has been recognized as a promising and applied technology that can be used for replacing current transport network architecture. Currently, optical burst switching system using WDM technology is developed and studied strongly in the WAN area. In the LAN area, a simple and efficient transmission system with low processing delay at the intermediate system is required. In this paper, a WDM-based simple media access scheme is presented in local optical access environments. Some simulation results are presented and implementation environment discussions are also presented.
李吉弘,李炫珪,朴昌宣 朝鮮大學校 動力資源硏究所 1982 動力資源硏究所誌 Vol.4 No.1
The Purpose of this study was to obtain suitable bench time by measuring Comperssive strength and surface stability of new sand and return sand of furan resin pattern. The results obtained in this study are summarized as follows. (1) SuitabIe bench time of new sand and return sand by the mixing ratio of resin and hardening agent was 25 to 38 minutes in new sand and 6 to 12 minutes in return sand. (2) In the return sand system the amount of resin addition wasenough to about 1/2 of new sand and was vcry economical. (3) Hardening velocity of return sand was very quick, therefore molding shonld quickly be done because bench time is short.