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AE 신호 형상 인식법에 의한 회전체의 신호 검출 및 분류 연구
김구영,이강용,김희수,이현,Kim, Ku-Young,Lee, Kang-Yong,Kim, Hee-Soo,Lee, Hyun 한국철도학회 2001 한국철도학회논문집 Vol.4 No.3
The signal pattern recognition method by acoustic emission signal is applied to detect and classify the defects of a journal bearing in a power plant. AE signals of main defects such as overheating, wear and corrosion are obtained from a small scale model. To detect and classify the defects, AE signal pattern recognition program is developed. As the classification methods, the wavelet transformation analysis, the frequency domain analysis and time domain analysis are used. Among three analyses, the wavelet transformation analysis is most effective to detect and classify the defects of the journal bearing..
2형 당뇨 환자에 있어서 C형 간염의 유병률에 관한 연구
김구영,서광섭,유광렬,임병욱,채선애,강남훈,김창훈,권영우,김희수,류성태,이정환,박성우,오웅식,김정한 중앙대학교 의과대학 의과학연구소 2003 中央醫大誌 Vol.28 No.1
Background: We have doubt about the truth that Type 2 DM is associated with chronic hepatitis C infection. The aim of our study was to prove a close relationship between chronic HCV infection and type 2 DM in korean patients. Methods: We reviewed the out-patient's medical records of 466 patients with type 2 DM who visit the Sung-ae hospital from March 2000 to August 2001. Diabetic patients were analyzed for the following variables: age, sex, waist circumference, weight, waist/hip ratio, using of self monitoring of blood glucose, method of therapy, duration of disease, experience of previous transfusion, major surgical procedure, accompanied disease, liver function tests (LFT), HbA1 c. We ruled out patients with liver cirrhosis. Results: Hepatitis C virus infection was observed more frequently in patient with Type 2 DM. Of 466 Type 2 DM patients, 13 patients were infected with Hepatitis C virus (2.79%). Compared with mean prevalence of Korean population (1.3~1.6%), it's value is very high. the other hand, 21 patients were infected with Hepatitis B virus (4.5%). Such results are similar to mean prevalence of the general public (4~5%). Conclusions: Prevalence of hepatitis C was closely associated in korean patients with type 2 DM. And an increased prevalence is independent of cirrhosis.
김구영,전철민,김태희,오준호,정재훈,박승기,Kim, Kue-Young,Chon, Chul-Min,Kim, Tae-Hee,Oh, Jun-Ho,Jeoung, Jae-Hoon,Park, Seung-Ki 대한자원환경지질학회 2006 자원환경지질 Vol.39 No.5
본 연구에서는 예산군의 소유역에서 하천수, 하상, 지하수의 수위 및 온도자료를 이용하여 혼합대(hyporheic zone)에서 하천수와 지하수와의 연계연구가 수행되었다. 소유역의 상류, 중류, 하류에서 심도별 지하수위 및 온도 변화를 살펴보았으며, 상 하류 지역에서 하절기와 동절기에 하상과 지하수의 온도를 장기간 모니터링하고 그 특성을 분석하였다. 동절기에는 하천수와 하상 상호간의 온도구배를 모니터링하고 그 특성에 따라 세 가지로 구분하였다. 하상 온도가 더 낮은 경우, 하상과 하천수의 온도가 비슷한 경우, 그리고 하상 온도가 더 높은 경우이다. 연구지역의 하상과 하천의 연계 상태는 하상의 분포에 대하여 균질한 연결성을 가지고 있지 않으며, 이는 하상 퇴적물이 두텁게 형성되어 있지 않고 불균질한 균열암반이 하상으로 노출되어 있기 때문이다. 지하수-하천수 연계 연구를 통해 획득된 온도 자료는 지하수 유동 모델링시 수위자료와 함께 모델보정(model calibration)에 유용하게 이용될 수 있다. A study on stream-groundwater exchange was performed using head and temperature data of stream water, streambed, and groundwater. Groundwater level and temperature were obtained from multi-depth monitoring wells in small-scale watershed. During the summer and winter season, time series of temperature data at streambed and groundwater were monitored for six months. In the winter time, we measured the temperature gradient between stream water and streambed. The observed data showed three typical types of temperature characteristics. First, the temperature of streambed was lower than that of stream water; second, the temperature of streambed and stream water was similar; and the last, the temperature of streambed was higher than that of stream water. The interconnections between the stream and the streambed were not homogeneously distributed due to weakly developed sediments and heterogeneous bedrock exposed as bed of the stream. The temperature data may be used in formal solutions of the inverse problems to estimate groundwater flow and hydraulic conductivity.
공항 IT기술이 공항 이용객의 신뢰성/즐거움 및 IT서비스의 재이용 의사에 미치는 영향에 관한 연구
김구영,박학순,이수미,김기웅,Kim, Goo-Young,Park, Hak-Soon,Lee, Su-Mi,Kim, Ki-Woong 한국항공운항학회 2017 한국항공운항학회지 Vol.25 No.3
The recent air transportation market is rapidly changing in air and airport infrastructure such as efficiency of airports and airplanes, speeding up and enlargement, deregulation of airline industry, low cost airlines and regional airports. The purpose of this study is to conduct a direct questionnaire survey for airport users who have experienced in and out of airport IT service at Incheon International Airport, so that the airport self - service technology and airport support technology can be used for the trust. At this point, I would like to develop a tool to understand the airport user's perception of airport IT and to test the theoretical model that investigates the relationship between various types of airport IT, airport users' trust, enjoyment and intention to use IT. In conclusion, this study aims to establish directions and suggestions for how to develop IT services among airport service provision factors.