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김익현 건국대학교 인문과학연구소 2003 인문과학논총 Vol.39 No.-
The intention of this study is to stimulate ethical discussion on the cloning of human beings between moral philosophers and bio-technologists. This study deals with ethical arguments for and against the cloning of human individuals and the cloning of human embryo. Most of scienists support the cloning of human embryo, because of utility of stem cell which is extracted from human embryo. This process inevitably involves destruction of the human embryo. This has raised ethical concern about moral standing of the human embryo. What is method to avoid such an ethical problem? It is method which extracts stem cell from adult somatic cell.
Sidewall을 이용한 초음속 이중압축램프에서의 실험적 연구
김익현,박기수,변영환,이종국 한국항공우주학회 2015 한국항공우주학회 학술발표회 논문집 Vol.2015 No.4
본 연구에서는 초음속 영역에서 sidewall을 이용한 이중압축 램프에서의 영향을 알아보는 실험연구를 수행하였다. 실제 풍동시험 시 유한한 너비를 가지는 형상에서는 유동이 유실되어 모멘텀을 잃어버리는 3차원 효과가 존재하기 때문에 실험적으로 유동의 2차원성을 확보하는 것이 중요하다. 유동의 2차원성을 확보하기 위해 이중압축 모델에 sidewall을 부착시킴으로써 유동이 유실되는 현상을 제한하였고 Infrared(IR) thermography와 shadowgraph 이미지를 통해 가능성을 확인하였다. This paper presents the experimental study of supersonic flows around a double compression ramp with a sidewall. The experiments were conducted in a supersonic blow-down wind tunnel. In the testing, due to a finite span, the mass leakage due to a momentum loss at the model sides causes the flow to become three-dimensional. In this work, a technique to minimize the loss and maintain near two-dimensional flow has been discussed. Infrared(IR) thermography and shadowgraph images were included to show the efficacy of the technique presented herein.
김익현,차현석,이태기,조규송 한국국방경영분석학회 2017 한국국방경영분석학회지 Vol.43 No.2
As the circumstances of securing repair parts and maintenance supports are under challenge, we analysed the estimated cost and it’s effects for the PBL(Performance Based Logistics) of K9 self-propelled artillery, K-series tanks, and Arthur-K,1K radars in this study. First, The cost estimation is performed by showing distinguishes between a general competitive contract and the PBL, with dataset of the repair parts merit during past 5-years or more. Second, To analyze the effects of PBL, we compared before and after PBL, with a CWT (Customer Waiting Time) and the time required of contractions for repair parts. Finally, we found the PBL works well with stable procurement of repair parts, and it recorded high effectiveness with a considerable decrease of CWT and the time required of administrative works for the contraction. But, we also found that PBL might costs more or not than classical general competitive contract by the certain performance grades.
입체 라멘 교각 구조물의 파괴 패턴 및 간이 내진성능 평가법
김익현 한국지진공학회 1999 한국지진공학회논문집 Vol.3 No.2
많은 수의 기존구조물의 내진보강 여부를 효율적으로 판단하기 위해서는 다단계로 구성되는 평가시스템을 도입하는 것이 바람직하다 본 연구에서는 지진피해를 입은 입체라멘 구조물의 피해원인을 지반 및 구조물의 특성에 따라 조사 검토하였으며 부재의 전단-휨 강도 여유도가 구조물의 내진성능에 밀접한 관계가 있음을 보여주고 있다 전단-휨 강도여유를 이용하여 대상구조물의 내진성능보강여부를 1차적으로 평가할 수 있는 1차 평각법을 제시하였으며 그 유효성을 구조물의 패해도와 비교하여 확인하였다. In order to check the necessity of seismic reinforcement for a great number of existing structures effectively, it might be desirable to introduce the multi-step seismic evaluation system. This paper presents close relationships between shear-to-moment capacity ratio of a member and seismic performance of structures concerned through the failure mechanism investigation in the view of geological and structural characteristics. Based on it, the simple seismic performance evaluation method has been proposed and its effectiveness was verified by comparing with the damage condition of structures damaged under Hyogo-Ken Nambu Earthquake.