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Fatigue Damage Spectrum을 이용한 궤도차량의 진동환경 비교
김재하,최병민,우호길 한국군사과학기술학회 2000 한국군사과학기술학회지 Vol.3 No.1
This paper provides the test results of tracked vehicle at each driving condition and life cycle. Fatigue Damage Spectrum(FDS) has evaluated with the Power Spectrum Density(PSD) and the life time of equipment. Finally, provisional vibration qualification test level is evaluated.
김재하,황동기,최대근,Kim, Jai-Ha,Whang, Dong-Kee,Choe, Dae-Geun 한국군사과학기술학회 2007 한국군사과학기술학회지 Vol.10 No.4
This paper considers the mechanical properties test results of the ceramic fiber reinforced plastic using hyper temperature. These materials were developed to make antenna cover which should not only protect antenna from high temperature and high pressure but also transmit and receive radio frequency for hypersonic missile. So the bending strength tests under the room temperature and the hyper temperature for new materials were done to evaluate of their performances. Also, the conductivity, specific heat, diffusivity and density were tested.
建康한 韓國靑年과 老人의 電氣심동도 所見에서 본 比較的觀察
金在河 慶北大學校 醫科大學 1958 慶北醫大誌 Vol.1 No.1
Statistical analysis of electrocardiogram on various age groups of healthy Korean has not been made. In the current study the electrocardiograms on healthy Korean young adults (20∼30years) and on 100 healthy Korean old persons over 60years are obtained and analysed statistically to determine the standard values for electrocardiogram on these subjects and to analyse the changes produced by the natural aging process. Electrocardiograms are abnormal in only 3% of the young adult group, whereas they are abnormal in 24% of the old person-group. The difference is statistically highly significant and the most of this difference is due to the Twave changes. None of the young adult-group has hypertension, while 36% of the old person-group have hypertension. The incidence of abnormal electrocardiogram in the group with hypertension is not significantly different from that in the group with normotension. The incidence of abnormal electrocardiogram in persons over 70 years of age in the United States (40.8%) is significantly higher than that in our old person-group who are over 60 years of age (24%). This indicates that the incidence of coronary acteriosclerosis with its complication in Korean old person is considerablly lower than that in American old person.
스마트 미디어 스마트 콘텐츠 : 스마트TV에서 영화 콘텐츠 중심으로
김재하 한국디지털스토리텔링학회 2011 디지털스토리텔링연구 Vol.6 No.-
스마트시대의 미디어와 기존 미디어의 차이점은 대중 미디어가 탄생 이후 어떠한 미디어보다 더 많은 변화를 가져다주었고 특히 사용자들의 적극적 참여와 기술의 발달에 의해 다양한 콘텐츠를 폭 넓게 소비할 수 있게 되었다는 점이다. 특히 스마트TV는 대중 매체의 대표 미디어로 대변되는 대량의 정보를 전달하는 기존의 TV서비스와 상호작용을 이용한 사용자의 개입이 가능하게 된 인터넷 서비스가 결합된 형태의 하이브리드TV 형태로 생각할 수 있다.