우리나라 중·소 하천의 세굴특성 조사연구

여운광,강준구 明知大學校 産業技術硏究所 1998 産業技術硏究所論文集 Vol.17 No.-

More than 100 bridges in Korea have been annually collapsed or badly damaged by the scouring around bridge piers, particularly in the flood season. To prevent from such a tragedy, the fundamental study on the bridge scouring is required, which is not only to estimate the scour depth with reliability but to take it into consideration in its design. However, it is not easy to find out the scour mechanism in physics since many factors on the scour are coupled with. Moreover, there exists none of the measured data sufficiently for the primary research on the bridge scour depths. In this study the field measurements are carried out to provide the fundamental data for the research and the design. Scouring depth, pier width, flow depth, and the approaching velocity and degree of pier nose are measured broadly in small and medium streams, from which the present situation on bride scours is understood, and it can be analyzed the effects of important factors such as the flow depth, the Froude number and the approaching degree. The in-situ measurements have been done to be analyzed in several regions; Yongin·Gwangju, Sumeon, Chungpeong·Phochun and Bukil area. They are also classified for investigation into two types of pier ; elliptic type and circle. In addincations, many existing equations for the scouring depth are applicated to compared with their field measurements.

Halothane 및 Enflurane 麻醉가 肝病變에 미치는 影響에 關한 實驗的 硏究

姜俊求,姜大榮 충남대학교 의과대학 지역사회의학연구소 1988 충남의대잡지 Vol.15 No.1

In an attempt to elucidate the pathological and biochemical effects of phenobarbital and cimetidine on halothane and enflurane induced hepatic lesions, the present study in male SpragueDawley rats was undertaken to evaluate the relation betwen serum glutamic pyruvic transaminase (SGPT) and pathologic change of the liver at 0, 2, 6, 12, and 24 hours after halothane and enflurane anesthesia for 3 hours with pretreatment of phenobarbital and cimetidine. Groups of male rats received phenobarbitaal, 100mg/kg intraperitoneally, for 5 days and on the sixth day received either cimetidine, 180mg/kg intraperitoneally, or saline 60min before anesthesia. The rats received further closes of cimetidine (180mg/kg intraperitonally) or saline 1 hour and 5 hour, after anesthesia. The results were as follows 1. In the phenobarbital pretreated halothane anesthesia groups, the necrotic change of liver was mildly observed immediately after anesthesia, becoming gradually more severe, while that of enflurane anesthesia was moderately necrotic immediately after anesthesia, and after that becoming more severe. 2. In the phe:aobarbital and cimetidine pretreated halothane or enflurane anesthesia groups, the degree of the necrotic change of the liver was decreased, compared to that of phenobarbital pretreated halothane or enflurane anesthesia. 3. In the cimetidine pretreated halothane anesthesia group, the degree of the necrotic change of the liver cells was decreased, compared to that of non-cimetidine pretreated group. 4. In the phenobarbital pretreated groups, the fatty change of the liver after halothane anesthesia was similar to that of enflurane anesthesia, but in the non-phenobarbitall pretreated groups, the fatty change in ithe enflurane anesthesia group was more severe than that of halothane anesthesia. 5. In the phenobarbital pretreated group, the halothane anesthesia group followed a time course of SGPT elevation, but the SGPT value in the enflurane anesthesia group increased immediately after anesthesia and remained elevated approximately 24 hours after anesthesia. In the phenobarbital and cimetidine pretreated group, the SGPT values after halothane or enflurane anesthesia were decreased, compared to those of the non-cimetidine pretreated groups, but the decrease in SGPT concentration was significant. In summary, the results obtained by the present study indicate the pathological effects of pretreated cimetidine and phenobarbital upon acute hepatic lesions after halothane anesthesia were similar to that of enflurane anesthesia, but we supposed that the necrotic change due to enflurane anesthesia was increased by phenobarbital but relatively decreased by cimetidine.

Phenobarbital 前處置가 Halothane 麻醉時 肝病變에 미치는 影響에 關한 病理組織學的 硏究

姜俊求,姜大榮 충남대학교 의과대학 지역사회의학연구소 1984 충남의대잡지 Vol.11 No.2

Since halothane, as a new potent, nonexplosive, volatile agent, was introduced in 1956, many case reports of liver necrosis following halothane anesthesia have raised to possibility that the agent may damage the liver under certain circumstances. This study was carried out to investigate the histopathological effects of phenobarbital pretreated halothane anesthesia to the rat liver cells. Sprague-Dawley rats (male and female) were pretreated with phenobarbital; PBT(100 mg/kg/ day) for 3 days. All animals in each experimental group (saline-control, saline-anesthetized, PBT-control, and PBT-anesthetized) were fasted for 15 to 16 hours prior to each anesthesia period. PBT and Saline-pretreated animals were anesthetized together for 3 hours one to two times at 3 day intervals in a single chamber from a calibrated vaporizer. Stage III anesthesia was introduced with 1% halothane in oxygen and maintained with 0.8% to 1% halothane. Controls received the equivalent amount of saline solution. Each animal was sacrificed immediately, at 6, 12, 18, 24 and 48 hours after anesthesia respectively. The histopathological changes in the liver of the control and experimental groups were noted as follows; 1. Vacuolar degeneration of the hepatic cells of PBT pretreated rats showed more marked degree than the control. In repeated exposure of animals to the anesthetic at 3 day intervals aggravates the lesioned in control and PBT pretreated rats. 2. In first exposure to the anesthetic, fatty changes of the hepatic cells in PBT pretrea rats showed more marked in degree than the control. In repeated exposure of rats aggravates the lesions in control and PBT pretreated rats, and that of PBT pretreated rats was similar to the control. 3. The marked necrotic changes of hepatic cells were present in the PBT pretreated rats but those of the control were rarely observed. Repeated exposure of rats aggravate the lesion.

학술 1 - 말 제대혈 유래 중간엽 줄기세포를 이용한 세포 치료

강준구,채준석,Gang, Jun-Gu,Chae, Jun-Seok 대한수의사회 2012 대한수의사회지 Vol.48 No.3

고도정수처리를 위한 오조/AOP (오존/H₂O₂) 공정 적용시 H₂O₂ 가 오존소모특성에 미치는 영향

강준구,황태문,임형남,오현제,강준원 대한환경공학회 2002 대한환경공학회 학술발표논문집 Vol.2002 No.06

잠재메탄발생량 분석을 통한 사일리지 농업부산물의 바이오가스화 가능성 평가

강준구,이동진,김기헌,오길종,이성수 한국폐기물자원순환학회 2013 한국폐기물자원순환학회지 Vol.30 No.7

In this study, the feasibility of the biogas production by anaerobic digestion with agricultural byproducts, which are stems and leaves of hot pepper or sweet pepper from one of the agricultural villages in South Korea, was investigated. The physico-chemical compositions of the agricultural byproducts of hot and sweet pepper were analyzed and they were found to be favorable with anaerobic digestion. Theoretical methane potentials of the test materials were estimated as 393.1 L CH4/kg VS for hot pepper and 372.6 L CH4/kg VS for sweet pepper. Biochemical methane potentials were analyzed by Biochemical Methane Potential (BMP) test and those of hot pepper and sweet pepper were 107.9 and 193.4 L CH4/kg VS, respectively. Silage was chosen to be long-term storage method for biogasification. Biochemical methane potential of hot pepper was increased by silage storage, while that of sweet pepper was decreased. In the case of silage chopping size, ensiled material with 30 mm size showed higher biochemical methane potential than that with 3 mm size. Most of test materials showed higher biochemical methane potentials with microbial additives containing Bacillus Circulans than that containing Bacillus Subtilis.

양면형 태양전지 기술 개발 동향

강준구,김준태 한국태양광발전학회 2015 한국태양광발전학회지 Vol.1 No.2

본고에서는 실리콘 기판을 기반으로 하는 태양전지의 효율을 높이기 위해 태양전지 전면뿐만 아니라 후면에도 전극을 배치하여 광흡수를 극대화한 양면형 태양전지의 연구 개발, 성능 측정 및 응용 기술등에 대한 동향을 소개하고자 한다.

물리치료 전공대학생들의 진로선호도와 학습동기에 관한 연구

강준구,복원주,서유리,이도영,한동국,손경현,이경현,Kang, Jun-Gu,Bok, Won-Ju,Seo, You-Ri,Lee, Do-Young,Han, Dong-Guk,Son, Kyung-Hyun,Lee, Kyung-Hyun 대한물리치료과학회 2015 대한물리치료과학회지 Vol.22 No.2

Purpose : This study is to investigate on career preference after graduation and learning motivation of students majoring in physical therapy. Methods : This survey implement with 400 students majoring in physical therapy from 3 college and university in korea, jeonnam 394 of 400 attended this survey. The measured date were analysed by using repeated anova, frequency analysis, $x^2$-test, t-test. Results : The results of this study were as follows: Career preference showed significant difference between male and female in department of orthopedic physical therapy and showed significant difference all by workplace(general hospital, special hospital). Career preference didn't show significant difference by schol system(college, university) and showed significant difference by work place. Learning motivation(inner motivation) showed significant difference in male by gender. Learning motivation didn't show significant difference by school system.

적외선 열화상 카메라를 이용한 사업장 폐기물 소각시설의 소각로 방열손실 측정 연구

강준구,민지수,윤영삼,이수영,김기헌,신선경 한국폐기물자원순환학회 2015 한국폐기물자원순환학회 학술대회 Vol.2015 No.11

적외선 열화상 카메라는 피사체의 실물을 보여주는 것이 아닌 피사체의 표면으로부터 복사(방사)되는 전자파의 일종인 적외선 파장 형태의 에너지(열)을 검출, 피사체 표면 복사열의 강도를 측정하여 강도의 양에 따라 각각의 다른 색상(false or pseudo color)으로 표현하여 주는 카메라이다. 이는 대상물체 또는 임의의 범위에 존재하는 열의 차이(온도)를 비접촉 방식으로 측정이 가능하다. 현재 방열손실의 온도 측정은 KS법에 의한 지점별 온도측정을 하고 있으나, 이는 접촉하는 지점마다 온도가 달라 평균적인 온도를 구하는 데는 문제점이 있다. 이를 개선하기 위해 공정별 표면온도를 고분해능 검지기를 이용한 적외선열화상카메라로 방열손실률을 측정 분석하고자 한다. 본 연구에서는 적외선 열화상 카메라 Laser Marker(-60℃ ~ 760℃)를 이용하여 Laser의 표면온도를 측정할 수 있는 미국제조회사인 FLIR社의 T650sc 모델을 이용하여 사업장 폐기물 소각시설의 소각로의 벽면의 온도를 측정하였다. 측정된 온도를 이용하여 복사 열 전달률을 구하기 위한 Stefan-Boltzmann법칙과 대류 열 전달율을 구하기 위한 Newton의 냉각 법칙과 소각로의 면적을 이용하여 로벽의 방열되는 손실을 계산해 보고자한다. 국내의 사업장 폐기물 소각시설 78개 호기 중 소각 방법별(일반소각, 고온소각), 소각로 타입별(Stoker, R/K + Stoker, R/K)로 나누어 대상 시설을 선정하여 현장실측을 진행하였다. 계산 시 사용되는 데이터는 1년간 자료를 이용하여 설문조사된 데이터를 바탕으로 계산되었으며 이를 이용하여 방열손실 계산에 적용하여 분석하였다.

이지트로닉스 소개 - 전력전자 전문기업

강준구 전력전자학회 2022 전력전자학회지 Vol.27 No.2