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손용만 ( Sohn Yong Man ),김현태 ( Kim Hyun Tae ),김영화 ( Kim Youug Hwa ),박지성 ( Park Ji Sung ),이재황 ( Lee Jae Hwang ),이경보 ( Lee Kyeong Bo ),이경도 ( Lee Kyung Do ) 한국농공학회 2007 한국농공학회 학술대회초록집 Vol.2007 No.-
This study was carried out to analyze the effect of different desalinating treatments on Seamangeum soil. Four treatments (full-time flooding, 3day interval flooding and drain, Tillage and ground leveling) were tested at Seamangeum tidal land of Gwanghwal-myeon, Gimje-si, Jeollabuk-do, Korea for two months. By full-time flooding and 3 day interval flooding treatment, desalinating rate of top (0-20cm) and mid-soil (20-40cm) was more than 95%, which the salinity of these soils was lowered to below 1dS/m. In addition, desalinating rate of lower-soil (50-80cm) was more than 70%. Desalinating rate of top-soil caused by ground leveling and tillage treatment was more than 70%. Besides, 64% of desalinating rate was also observed in mid-soil. Desalinating treatment did not affect top-soil of either control or the outer area of experimental plots. On the contrary, these area was resalinized and soil salinity became higher.
동일한 상시 호흡량의 $N_2-O_2$ 및 Heliox 투여 시 가스교환지표의 비교
손장원,임채만,고윤석,이종덕,이상도,김우성,김동순,김원동,Sohn, Jang-Won,Lim, Chae-Man,Koh, Youn-Suck,Lee, Jong-Deog,Lee, Sang-Do,Kim, Woo-Sung,Kim, Dong-Soon,Kim, Won-Dong 대한결핵및호흡기학회 1998 Tuberculosis and Respiratory Diseases Vol.45 No.1
연구배경: Heliox는 기도 저항이 증가된 환자에서 분시환기량의 증가와 호흡일의 감소로 인해 $PaCO_2$가 감소함이 알려져 있다. 이러한 효과 이외에도 최고 호기 유량비의 증가와 가스 분포의 호전에 의한 사강 호흡률의 감소효과도 있을 것으로 기대된다. 이에 저자등은 공기($N_2-O_2$)호흡 시와 통일한 분시환기량과 호흡일의 조건에서 heliox투여로 $PaCO_2$가 감소하는지 연구하였다. 대상 및 방법: 호흡 부전으로 기계호흡 중인 환자 중 기관지 천식이나 상기도 협착이 있으며 근 이완제 투여로 자신의 호흡일이 없는 8명(남 : 여 =5 : 3, 평균 68세)을 대상으로 하였다. 연구는 각 15분씩 기저 $N_2-O_2$투여, heliox투여 및 washout순으로 진행하였다. Heliox는 Servo 900C기종의 저압입구(low pressure inlet)를 통해 공급하였다. 호흡 역학 지표는 CP-100 monitor(Bicore, USA)로 측정하였고 heliox 투여시 동일한 일호흡량 유지을 위해 $N_2-O_2$에 대한 상대유량 비로 상시 호흡량을 보정하였다. 사강 호흡률용 Bohr의 공식으로 구하였다. 결 과: 일호흡량, 분시환기량, 최고 흡기압 및 최고 흡기 유량 비는 $N_2-O_2$와 heliox투여 군 사이에 차이가 없었다. 최고 호기 유량 비는 heliox투여 군에서 ($0.52{\pm}0.19$L/sec) $N_2-O_2$투여 군($0.44{\pm}0.13$L/sec)보다 높았다 (p=0.024). $PaCO_2$는 heliox투여 군 ($56.1{\pm}14.1$mmHg)이 $N_2-O_2$투여 군 ($60.5{\pm}15.9$mmHg) 보다 낮았고 (p=0.027), 사강 호흡률은 heliox투여군 ($71{\pm}10%$)이 $N_2-O_2$ 투여 군 ($73{\pm}9%$)보다 낮았다. 결 론: 분시환기량과 호흡일이 동일한 조건에서도 heliox투여 시 $N_2-O_2$투여에 비해 $PaCO_2$의 감소가 관찰되며 이는 사강 호흡률의 감소와 관련이 있을 것으로 사료된다. Background: Heliox is known to decrease $PaCO_2$ in patients with increased airway resistance by increasing minute ventilation and reducing work of breathing(WOB). Besides these effect, heliox is expected to decrease functional anatomic dead space owing to improvement of peak expiratory flow rate(PEFR) and enhancement of gas distribution. We investigated whether heliox can decrease $PaCO_2$ even at the same minute ventilation (VE) and WOB with $N_2-O_2$ to speculate the effect of the heliox on the anatomic dead space. Material and Method: The subjects were 8 mechanically ventilated patients with asthma or upper airway obstruction(M : F=5 : 3, $68{\pm}10$years) who were under neuromuscular paralysis. The study was consisted of three 15-minutes phases: basal $N_2-O_2$ heliox and washout Heliox was administered via the low pressure inlet of servo 900C, and respiratory parameters were measured by pulmonary monitor(CP-100 pulmonary monitor, Bicore, Irvine, CA, USA). To obtain the same tidal volume(Vt) in heliox phase, the Vt on monitor was adjusted by the factor of relative flow rate of heliox to $N_2-O_2$. Dead space was calculated by Bohr equation. Results: 1) Vt, VE, peak inspiratory pressure(PIP) and peak inspiratory flow rate(PIFR) were not different between $N_2-O_2$ and heliox. 2) PEFR was higher on heliox($0.52{\pm}0.19$L/sec) than $N_2-O_2$($0.44{\pm}0.13$L/sec)(p=0.024). 3) $PaCO_2$(mmHg) were decreased with heliox($56.1{\pm}14.1$) compared to $N_2-O_2$($60.5{\pm}15.9$)(p=0.027). 4) Dead space ventilation(%) were decreased with heliox($73{\pm}9$ with $N_2-O_2$ and $71{\pm}10$ with heliox)(p=0.026). Conclusion: Heliox decreased $PaCO_2$ even at the same VE and WOB with $N_2-O_2$, and the effect was considered to be related with the reduction of anatomic dead space.
발전소내 긴 밸브 stem을 갖는 옥외 소화전의 파손 현상 규명
손석만(Sohn Seok-Man),이상국(Lee Sang-Guk),이욱륜(Lee Wook-Ryun),이준신(Lee Jun-Shin),김기태(Kim Ki-Tae) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Nuclear power plant has many external fire hydrants that have to operate in the state of emergency such as facility fire, forest fire. The valve stem of one among them was broken 3 times for 4 years. It had long valve stem and operated under high water pressure. The elongation and the tensile strength for the broken valve stem was measured to examine the defect of material property. And the vibration level and the natural frequencies was detected to check the resonance. As the result of a diagnosis, the cause of this fault is proven buckling of long valve stem.
기계 호흡 중 불안정한 호흡역학을 보인 환자에서 압력조절용적조정양식(Pressure-regulated Volume Control Mode)의 효용
손장원 ( Jang Won Sohn ),고윤석 ( Youn Suck Koh ),임채만 ( Chae Man Lim ),심태선 ( Jong Deog Lee ),이종덕 ( Tae Sun Shim ),이상도 ( Sang Do Lee ),김우성 ( Woo Sung Kim ),김동순 ( Dong Soon Kim ),김원동 ( Won Dong Kim ) 대한결핵 및 호흡기학회 1997 Tuberculosis and Respiratory Diseases Vol.44 No.6
손진만(Jin-Man Sohn),김성수(Sung-Soo Kim),박종호(Jong-Ho Park),신용학(Yong-Hark Shin),이학주(Hak-Ju Lee) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
신재생에너지원 및 분산전원의 계통연계가 증가함에 따라 이를 효율적으로 관리하고자 하는 마이크로그리드에 관한 연구가 활발히 진행되고 있다. 마이크로그리드는 효율성 및 경제성을 감안하여 열부하 및 전기부하를 동시에 공급하는 형태로 운용될 가능성이 높다. 본 논문에서는 마이크로그리드 에너지관리시스템의 운용과 관련된 기능 중열부하 및 전기부하를 고려한 마이크로그리드에서의 경제급전에 대한 최적화 모델을 제시하였다.
손종렬(Jong-Ryeul Sohn),윤승욱(Seung-Wook Yoon),김윤신(Yoon-Shin Kim),노영만(Young-Man Roh),이철민(Cheol-Min Lee),손부순(Bu-Soon Son),양원호(Won-Ho Yang),이윤규(Yun-Gyu Lee),최한영(Han-Young Choi),이진성(Jin-Sung Lee) 한국실내환경학회 2006 한국실내환경학회지 Vol.3 No.1
Recently, indoor air quality (IAQ) in workplace, residence, and schools has been one of the major concerns of people, scientists and the related public. This study was performed to investigate the characteristics of indoor air quality(IAQ) in kindergartens, elementary school, middle schools, and high schools from June 2004 to May 2005 in Korea. We measured indoor air pollutants such as PM₁?, CO₂, formaldehyde, total bacteria colony(TBC), CO, radon, total volatile organic compounds(TVOCs), asbestos, and O₃ from school classrooms. The subjects were classified by building year based on the time span of 1, 1-3, 3-5, and 5-10 years. The levels of pollutants and physical factor in schools were compared with standards and guidelines of indoor air quality on the Ministry of Environment, the Ministry of Health and Welfare, and the Ministry of Education, and Human Resources Development of Korea. The major results obtained from this study can be summarized as follows. Asbestos and O₃ were not detected in all surveyed classrooms. However, we were able to detect CO, TBC, TVOCs, and formaldehyde in kindergartens, TBC in elementary schools, TBC, TVOCs and formaldehyde in middle schools, and formaldehyde in high schools. This study was conducted to provide a basis for the management IAQ in school. Therefore, we suggest that a national plan for the management of IAQ in school should be established through a long-term, continuous investigation for the proper assessment of IAQ in school and for the health risk assessment for student.
CMI와 THI에 의한 서울시내 개인택시 실내환경 근무 운전기사의 건강영향 평가 연구
손종렬(Jong-Ryeul Sohn),변상훈(Sang-Hoon Byun),노영만(Young-Man Roh),김윤신(Yoon-Shin Kim) 한국실내환경학회 2005 한국실내환경학회지 Vol.1 No.2
This study was performed to investigate the health status of 600 owner-driver of taxi in Seoul City during from August 1, 2003 to February 28, 2004. The prevalence of subjective symptoms were surveyed by a general health questionnaires such as Todai Health Index (THI) and the Cornell Medical Index (CMI). In the THI health check table, prevalence of the complaints of mental subjective symptom by age was high in the items of fabrication (L), digestion (C), and aggressiveness (F) from 31 to 40 years old drivers and mental subjective symptom by age was high in all items except for tiredness (I), melancholia (N), and hypersensitivity (P) for the 60 years old drivers and showed in the items of melancholia (N) and hypersensitivity (P) for the 40 years old. From the complaints of mental and physical subjective symptoms about work satisfaction in the THI health check table, the strong dissatisfaction showed in the all items except for eye and skin trouble (B). All items except hypersensitivity (P) showed dissatisfaction in prevalence of complains of mental and physical subjective symptoms about work satisfaction in the CMI health check table. From the complains of mental and physical subjective symptoms on salary satisfaction in the THI health check table, the taxi driver who earn the salary of 1 million won showed statistically significant symptom of eye and skin trouble (B) and showed high tendency in all items except for respiratory (A) and digestion (C) systems. It is suggested that the appropriate health control for owner-driver of taxi should be applied to reduce the prevalence of complaints that showed mainly in the irregular working time and sleeping disorders.
배터리 모듈 냉각 플레이트의 냉각 성능 예측을 위한 비정상 전산유동해석 및 실험적 연구
박상환(Sang Hwan Park),장경식(Kyoungsik Chang),조홍영(Hong Young Cho),정희석(Hui Seok Jeong),손성만(Sung Man Sohn) 대한기계학회 2021 大韓機械學會論文集B Vol.45 No.7
전기에너지를 사용하는 친환경자동차에서는 리튬 이온 배터리가 주로 사용되고 있으며 별도의 냉각 장치를 필수적으로 설치하여야 한다. 본 논문에서는 냉각 플레이트를 이용한 수랭식 냉각방식을 연구하였다. 냉각 플레이트의 냉각 성능을 향상시키기 위해 내부 유로 형상을 개선하였고 전산유동해석을 통해 성능을 예측하였다. 실험 결과와 비교를 위해 비정상 유동해석을 진행하였고 냉각 성능 비교는 입·출구 온도 차를 이용한 방열량을 계산하여 비교하였다. 전산해석을 통해 개선된 유로 형상이 11.47% 더 높은 방열량을 예측하였다. 실험을 통해 냉각 플레이트의 성능을 측정하고 전산해석 결과를 검증하였다. 실험 결과 11.86%의 더 높은 방열량을 나타냈으며 전산유동해석과 5% 이내의 오차를 보였다. Electric vehicles mainly use lithium-ion batteries, and a cooling system must be installed in them. In this study, a water-cooling system that uses a cooling plate was studied. The shape of the internal flow path was improved to enhance the performance of the cooling plate; the performance was predicted using computational flow analysis. Unsteady flow analysis was performed to compare the experimental results, and the cooling performances were compared by calculating the amounts of rejected heat using the inlet and outlet temperature differences. The improved flow-path shape showed an 11.47 times higher amount of rejected heat. The performance of the cooling plate was also measured through an experiment, and the computational analysis result was verified. An 11.86 times higher amount of rejected heat and an error within 5% were obtained in the computational flow analysis.