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저대역 센서 네트워크 기반의 양방향 보안등 관제 시스템 개발
이호근(Ho-Gun Lee),이상호(Sang-Ho Lee),이석규(Suk-Gyu Lee),최정원(Jeong-Won Choi) 한국조명·전기설비학회 2010 조명·전기설비학회논문지 Vol.24 No.10
This paper shows an implementation and management result of wireless networks based security light control system, which performs a great role in protection of pedestrians and prevention of crime. Conventional security light units have severe limits in confirmation and inspection of security light unit failure, like wilful damage by someone or failure by influence of other equipment or failure by spontaneous heat-increase, and so on. In addition, local government offices are responsible for maintenance of security light units and as a matter of fact, most of civil complaints are about security light units. It is an obvious that the existing security light maintenance system reaches the limit and the security light maintenance problem is a difficulty of local government. Therefore, efficient security light control system is needed, which enables central control and intelligent maintenance. Moreover, the system has to be easy to control and has to be stable. In this study, wireless sensor network based security light control system is implemented, which is independent of programming language and platform, and which is simple to control and extend the system. The proven protocols, HTTP and SOAP, are utilized in order to improve the system reliability. This paper shows the excellence of our proposed system by implementing and operating it in real environment.
Cephalosporium acremonium var. M-10에 의한 Cephalosporin C 생산에 관한 연구
이호근,현형환,오두환,유주현 연세대학교 산업기술연구소 1990 논문집 Vol.22 No.2
The microorganism which produces Cepholsoporin C, has been selected from Cephalosporium acromonium by U.V radiation. Among the mutants, Cephalosporium acremonium var. M-10 was showed the highest Cephalosporin C productivity. On the basis of physiologieal characteristics, the difference hetween Cephalosporium acremonium var. M-10 and Cephalosporium acromonium was that the mutant did not assimilate sodium acetate, potassium nitrate, sodium nitrate. By using Cephalosporium acremonium var. M-10, the optimum conditions for the production of cephalosporin C on the rotary shaker were pH 7.0 soluble starch 4.0 w/v%, (NH₄)₂SO₄0.75w/v%,, CaCl ₂w/v%, soy bean meal 2w/v%, oleic acid 0.09w/v%, methionine 0.3w/v%, at 30℃ for 120 hours, respectively. On the study of time course, it revealed that the peak appeared at the stationery phese. The amount of Cephalosgorin C produced in this medium by mutant was about two times larger than that by Cephalosporium acremonium.