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아질산성질소 축정용 FIA의 제작 및 용용에 관한 연구 (광주광역시 광주천 시료를 대상으로)
이재성 ( J. S. Rhee ),박완철 ( W. C. Park ),이수원 ( S. W. Lee ),김용준 ( Y. J. Kim ) 한국물환경학회 2002 한국물환경학회지 Vol.18 No.3
In this study, home-made detection system by means of noble FIA is introduced on the measurement of toxic nitrite in the water samples collected from the area of Kwangju. As the standard calibration between 30 to 1000 ppb, the linearity has been shown more than 0.9999 as the correlation coefficient(R^2) with the detection limit 1.5 ppb(S/N>2). The distribution of sample concentration was monitored as N.D. - 123 ppb which is wide span of concentrations in field water samples. The low level of nitrite is hardly detectable with other expensive sophisticated instruments including ion chromatography. Whereas the result of high concentration brings forth the necessity monitoring constantly our precious water resources. Successfully, the FIA system has played a very important role detecting wide span of nitrite in water sample. This technique can be adopted for controlling our environment in the near future.
이재성,최선미,안춘모,유영상,J.S. Lee,S.M. Choi,C.M. Ahn,Y. Yoo 한국전자통신연구원 2023 전자통신동향분석 Vol.38 No.4
Cyberspace is emerging as a critical domain requiring national-level governance and international cooperation owing to its potential financial and societal impacts. This research aims to investigate the cybersecurity policies from major countries for understanding with comprehensive perspectives. Global trends emphasize a comprehensive command-centered approach, with top leadership directing cybersecurity policies. Key policy areas include security across technology ecosystems, protection of critical infrastructure, and software supply chain security. Investment is being focused on zero-trust architectures, software bills, and new technologies like artificial intelligence. For countries like Korea, immediate response and adaptation to these trends are crucial to develop and enforce national cybersecurity policies.
초음파에너지를 이용한 가솔린 인젝터의 충돌분무특성에 관한 연구
이재성(J.S.Lee),윤면근(M.K.Yoon),류정인(J.I.Ryu) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
In this experiment, we used the collisional spray and the ultrasonic energy adding system to minimize the droplets. So we obtained the small droplets by the collisional effect and the ultrasonic energy effect. To obtain the collisional droplets, we used the intake valve. The ultrasonic energy fuel system is composed the step-type horn coupled the inner bolted Langevin type transducer and the gasoline injector. We measured the droplets(SMD) around the model intake valve using the Malvern 2600D system with a variation of the injection pressure and test position.<br/>