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임홍철,박기준,이숭재 한국비파괴검사학회 2000 한국비파괴검사학회지 Vol.20 No.4
콘크리트 내부에 위치한 철근과 공동의 탐사 성능을 파악하기 위해, 상용 비파괴 검사 장비를 이용한 측정과 이론적 모델링을 실시하고, 향상된 신호처리 결과의 예를 제시하였다. 실측에 사용된 장비는 레이더 장비 2종과 전자기법 철근 참사 장비 2종이다. 철근 참사에는 직경 19mm의 철근을, 그리고 공동 탐사에는 두께 50mm의 스티로폼을 콘크리트 시험체 안에 각기 다른 피복 두께로 매립하여 측정하였다. 또한, 철근의 수평 배근 간격 탐사를 위해 두개의 철근을 매립 측정하였다. 실험과 함께 전자기파 모델링 방법을 소개하여, 레이더를 이용한 경우, 철근과 공동이 탐지되는 과정을 이론적으로 보여주었다. 탐사능을 향상시키기 위해, 상용 레이더 장비의 측정 결과를 신호처리 과정을 통해 개선하였다.
Park, Young-Chul,Lee, Chang-Been,Bang, Seong-Sik,Choi, Dong-Ki,Whang, Woo-Sik,Lee, Jae-Kwon,Han, Jung-Woo,Jung, Taek-Kyun,Soong-Keun-Hyun, American Scientific Publishers 2018 Journal of nanoscience and nanotechnology Vol.18 No.3
<P>WC based alloy coatings included different mass percent of Co and Cr have been synthesized on high carbon steel by using a facile high velocity oxy-fuel spray method. The mechanical nature of the coating films has been investigated by micro vickers hardness and fracture toughness. X-ray diffraction (XRD) and EDX analyses indicate that the three different samples (WC-10Co-4Cr, WC17Co, and WC-12Co) consist of pure WC, W, Cr, and Co constituents as well as W2C and Co6W6C phases. The SEM and image analysis results show that WC-10Co-4Cr condition has higher porosity than those of WC-17Co, and WC-12Co coatings. WC-17Co coating showed the highest value in the hardness and fracture toughness test among three different samples. The obtained results revealed that the mechanical properties of WC based alloy coatings synthesized by a facile high velocity oxy-fuel spray method is very sensitive to Co content.</P>
최근 5년간 경북지역에서 발생한 한국형 출혈열의 임상적 고찰
박승국,김현철,박성배 啓明大學校 醫科大學 1987 계명의대학술지 Vol.6 No.2
The epidermiology, clinical course, treatment and factors of related prognosis in 157 cases of Korean Hemorrhagic Fever (KHF) were analyzed. The patients studied were admitted to Keimyung University Hospital in Kyungpook Province from January 1982 through December 1986. The results were as follow : 1. By age distribution, the group in the ages 40 to 60 was 55.4%. By sex, there were more male than female(2.4:1). 78.6% of the KHF studied, occurred from October to December in every year which revealed a single large peak prevalence pattern. 2. The geographic distribution in the Kyungpook Province showed the occurrence of KHF concentrated in the northern and middle part of the province near the So Bak Mountains. 3. The oliguric phase was the most frequent phase of the disease on admission. The common clinical symptoms were fever, chill, general aches, and abdominal pain and nausea. Conjunctival congestion, CVA tenderness, and abdominal tenderness were frequently found on physical examination. Soft palate petechiae was the most common finding of the bleeding tendency. 4. Leukocytosis, thrombocytopenia, hematuria, proteinuria and elevation of BUN & serum creatinine levels were the common laboratory findings. Usually the SGOT level was higher than SGPT level. SGOT elevated cases were 73% in all of the KHF patients. 5. 47.1% of the patients received hemodialysis , 11% were treated with peritoneal dialysis, and the remaining patients received conservative therapy. The frequency of hemodialysis was less than 3 times in most of the cases and the average duration of peritoneal dialysis was 7.4 days. 6. The overall mortality rate of KHF was 11.5% in this study. The fatalities in the hypotensive phase were 61.6% and oliguric phase was 38.9%, but there were no deaths during the diuretic phase. The main cause of death was irreversible shock(61.1%). Other causes of death were pulmonary edema(16.7%), gastrointestinal bleeding, cerebral hemorrhage, and encephalopathy (5.6% respectively). 7. The factors more commonly seem in the patients who died were the older age group with elevated hemoglobin, hematocrit, urine specific gravity, and serum transaminase levels.
직사각형 슬릿 개구를 갖는 금속 함체의 차폐 효과에 대한 연구
이숭근(Soong Keun Lee),성철민(Cheol Min Seong),김은하(Eun Ha Kim),유승렬(Seung Real Ryu),이재현(Jae Hyun Lee),박동철(Dong Chul Park) 한국전자파학회 2012 한국전자파학회논문지 Vol.23 No.5
직사각형 슬릿 개구를 갖는 금속 함체에 수직, 수평 편파를 입사하여 차폐 효과를 연구하였다. 직사각형 슬릿 개구의 magnetic polarizability와 금속 함체의 공진 모드를 이론적으로 분석하였고, 이를 바탕으로 시뮬레이션 결과와 측정 결과를 비교 분석하였다. 또한, 함체 내부 프로브의 위치에 따른 차폐 효과 의존성도 분석하였다. Shielding effectiveness(SE) of metallic rectangular enclosure with rectangular slit apertures at horizontal polarization(HP) and vertical polarization(VP) is investigated. The magnetic polarizability of the rectangular slit apertures and the resonance modes of the metallic rectangular enclosure are analyzed theoretically. The simulation results based on these theoretical analyses are compared with the measured ones. The dependence of the shielding effectiveness on the location of the calculation probe inside the enclosure is also investigated.
Pack, Seung-Chul,Kim, Hye-Ran,Lim, Sang-Woo,Kim, Hwan-Young,Ko, Jung-Yun,Lee, Ki-Sang,Hwang, David,Park, Seong-Il,Kang, Hoon,Park, Sang-Wook,Hong, Gun-Young,Hwang, Se-Min,Shin, Myung-Geun,Lee, Soong Springer International ; Springer-Verlag, distribu 2013 International journal of colorectal disease Vol.28 No.1
<P>The purpose of present study was to investigate the methylation status of the promoter region in five genes (mothers against decapentaplegic homolog 4, fragile histidine triad protein, death-associated protein kinase 1, adenomatous polyposis coli (APC), and E-cadherin), which are known to be involved in the pathogenesis of colorectal cancer (CRC) and its clinicopathological significance.</P>