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공동주택내 이산화질소(NO2) 및 휘발성유기화합물(VOCs) 노출에 따른 건강 위해성 평가
Jung,Soon-Won,Yang,Won-Ho,Son,Bu-Soon 한국환경보건학회 2007 한국환경보건학회지 Vol.33 No.4
Indoor air quality has become a topic of interest and concern. Especially changes in construction design and the increased use of synthetic products may result in an increasing of complaints and health effects about the quality of indoor air at home. In this study, nitrogen dioxide(NO2) and volatile organic compounds(VOCs) within new and established apartments on the basis of 4 years of building year were measured every 3 days consecutively during 60 days. We selected each 10 house in Seoul, Asan and Daegu, respectively, and produced risk numbers for hazard quotients, and predicted increases in incidence of cancer. The calculations were made for the adult with default exposure values and also made for a worst case scenario using Monte-Carlo simulation as describing the reasonable exposure(RME). Mean of Monte carlo analysis by benzene, in the construction under 4 years (male: 9.2105, female: 1.0×104) and over 4years (male: 6.8×105, female: 8.3×105) exceeded 106 of permitted standards in US EPA, RME of Monte carlo analysis. In construction under 4 years (male: 9.9×103, female: 9.6×103) and over 4years (male: 9.8×103, female: 7.8×103) exceeded 104 of maximum permitted standards in US EPA. The hazard index of non-carcinogenic pollutants by nitrogen dioxide, toluene, m,p-xylene and o-xylene, both male and female in apartment constructed under 4 years and over 4 years was found less than the permitted standards of hazardous health effects in CTE. Significant cancer risks and non-cancer hazard quotients were predicted in under 4 years of building year.
( Jae Won Byun ),( Kyung Hyun Lee ),( Ha Young Kim ),( Soon Seek Yoon ),( Ji Youl Jung1 ),( Woo Seog Jeong1 ),( Jae Ku Oem ),( Jong Soo Lim ),( Myoung Heon Lee ),( You Chan Bae ) 한국예방수의학회(구 한국수의공중보건학회) 2013 예방수의학회지 Vol.37 No.1
Nine cattle among 18 in a native Korean herd died or were euthanized within 3 days. The affected cattle showed cowshed. The pigs and dogs had been fed leftover food originating from nearby restaurants, and the cattle could presumably reach the contaminated food in the pig troughs. Necropsy revealed a few chicken bones and red pepper pieces as well as large amounts of grain and rice straw hay mixed in the rumen. Botulism type D was isolated in the ruminal contents of one of the cattle. We speculated that the outbreak was associated with the cattle incidentally eating presumably contaminated leftover food from the pig trough.
하수처리장 적용을 위한Semi-카플란 수차가 장착된 마이크로수력발전 시스템
채규정(Kyu Jung Chae),김동수(Dong Soo Kim),천경호(Kyung Ho Cheon),김원경(Won Kyoung Kim),김정연(Jung Yeon Kim),이철형(Chul Hyung Lee),박완순(Wan Soon Park) 大韓環境工學會 2013 대한환경공학회지 Vol.35 No.5
소수력발전은 하수처리장 에너지 자립을 위한 효과적인 대안이다. 본 연구는 유량변동이 크고 유효낙차가 낮은 중소형하수처리장(기흥레스피아) 적용을 위해 피치조절형 세미카플란(semi-kaplan) 마이크로수력발전의 적용 타당성을 평가하였다. 가변피치 semi-kaplan 수차는 유량조절을 위한 가이드베인은 생략하고 피치조절형 런너를 장착하여 기계적 결함은 줄이면서 유량변동이 큰 처리장에 특화된 기술이다. 마이크로수력발전 시스템은 설계조건(유량 0.35 m3/s, 유효낙차 4.7 m)에서 90.2%의 수차효율 달성이 가능하였고 발전용량은 13.4 kW로 산정되었다. 설비가동률 74%로 가동 시 연간 약 86.8 MWh 에너지 생산을 통해 2.1%의 에너지 자립이 가능하고 이는 연간 49톤의 CO₂ 감축효과와 맞먹는다. 경제성 평가결과 초기 건설공사비가 200,000,000원 이하인 경우에는 내부수익률은 6.1%, 순현가는 15,539,000원, 편익-비용률은 1.08, 투자회수년은 15.5년으로 경제성이 충분한 것으로 나타났다. Small scale hydropower is one of most attractive and cost-effective energy technologies for installation within sewage treatment plants. This study was conducted to evaluate the potential of a semi-kaplan micro-hydropower (MHP) system for application to sewage treatment plants with high flow fluctuations and a low head. The semi-kaplan MHP is equipped with an adjustable runner blade, and is without a guide vane, so as to reduce the incidence of mechanical problems. A MHP rating 13.4 kWp with a semi-kaplan turbine has been considered for Kiheung Respia sewage treatment plant, and this installation is estimated to generate 86.8 MWh of electricity annually, which is enough to supply electricity to over 25 households, and equivalent to an annual reduction of 49 ton CO₂. The semi-kaplan turbine showed a 90.2% energy conversion efficiency at the design flow rate of 0.35 m3/s and net head of 4.7 m, and was adaptable to a wide range of flow fluctuations. Through the MHP operation, approximately 2.1% of total electricity demand of Kiheung Respia sewage treatment plant will be achievable. Based on financial analysis, an exploiting MHP is considered economically acceptable with an internal rate of return of 6.1%, net present value of 15,539,000 Korean Won, benefit- cost ratio of 1.08, and payback year of 15.5, respectively, if initial investment cost is 200,000,000 Korean Won.
UV 센서 응용을 위한 SiC MIS 소자에 관한 연구
구경완(Kyung一Wan Koo),정순원(Soon一Won Jung) 호서대학교 공업기술연구소 2006 공업기술연구 논문집 Vol.25 No.1
In this paper, we propose aluminum nitride(AlN) thin film as gate insulating material instead of SiC )2 on 6H~SiC MIS devices. For quite a low lattice misfit with SiC, AIN is as attractive as new gate insulating material in SiC devices. The fabrication of aluminium nitride (AIN) films directly on 6 H-S 1 ᄂ(0001) substrates by reactive magnetron sputtering method has been performed with rapid thermal annealing at a temperature range 01 ZOO 1000 °C in nitrogen ambient for enhancement of crystallization of films. The structural properties of AIN films on 6H-SiC(0001) by RTA analysed by XRD(X-Ray diffraction). The A1N(0002) peaks was clearly found. The dielectric constant of deposited films was obtained as around 8.4 from the accumulation region of capacitance-voltage curve. It is almost the same value with the bulk AIN. Also, the gate leakage current density of the MIS capacitor was 10 9 A/cm2 order within the electric field of 2 MV/cm. The amount of Djt was evaluated as about 5X1010 eV_1cm at a location of 0.5 eV from the midgap.
Decreased Hepatic Nerve Fiber Innervation in Patients with Liver Cirrhosis
( Soon Woo Nam ),( Hyun Joo Song ),( Su Jung Back ),( Tae Hun Kim ),( Se Hyun Cho ),( Joon Yeol Han ),( Kwon Yoo ),( Young Suk Lee ),( Kyu Won Chung ) 대한소화기기능성질환·운동학회 2007 Gut and Liver Vol.1 No.2
Background/Aims: Hepatic nerve innervation plays important roles in hepatic metabolism and hemodynamic mechanisms. We compared the distribution patterns of hepatic nerves between normal livers and two liver diseases to elucidate the effects of liver disease on the distribution of hepatic nerves. Methods: Tissue specimens were obtained by ultrasonography-guided needle biopsies from 10 normal controls, 74 patients with chronic hepatitis (CH), and 35 patients with liver cirrhosis (LC). The obtained specimens were immunohistochemically stained using antibodies for S-100 protein and α-smooth-muscle actin (α-SMA). The degree of the expression in liver tissues was quantified by manual counting of positively stained nerve fibers under light microscopy. The serum hyaluronic acid level was assayed in all subjects to evaluate hepatic fibrosis. Electron microscopy examinations were also performed. Results: The hepatic nerve innervation was significantly lower in LC than in normal controls, as indicated by S-100 protein staining. α-SMA and hyaluronic acid levels were higher in LC and CH than in normal controls. Electron microscopy revealed that unmyelinated nerve fiber bundles in the intralobar connective tissue coursed in the vicinity of hepatic triads. Conclusions: These results suggest that hepatic nerve innervation can be decreased by hepatic inflammatory responses and/or fibrotic changes in LC patients. Further study is needed to clarify this observation. (Gut and Liver 2007; 1:165-170)
LiNbO3 Ferroelectric Properties on High--and Moderate--Doped Si Substrates
Soon-Won Jung,Kwang-Ho Kim,노광수,Sang-Hyun Jeong,Yong-Il In,Yong-Seong Kim 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
Ferroelectric LiNbO3 thin lm properties in MFS structures have been evaluated using degenerated Si wafers with elimination of the depletion layer capacitance in uence in the substrates surface. Signicant ferroelectric properties could be obtained only after the lms were annealed above 750 C. The capacitance on highly doped Si wafer shows hysteresis behavior like a butter y shape and this result indicates clearly that the dielectric lms have ferroelectric properties. The typical measured remnant polarization (2Pr) and coercive led (EC) values were about 1.2 C/cm2 and 120 kV/cm, respectively, in an applied electric eld of 300 kV/cm. In case of fatigue, there was no loss in switched polarization up to 1011 cycles using 1 MHz square wave form at 300 kV/cm with platinum electrode. The extracted switching time (tsw) was less than 20 ns. Switching charge density, Qsw, which was calculated by the integral of the dierence between the switching current and non-switching current, was about 1.6 C/cm2 for the positive amplitude of the pulse of 300 kV/cm. The switching charges degraded only by 10 % of their initial values after 4 days at room temperature.
Jung, Soon-Won,Na, Bock Soon,You, In-Kyu,Koo, Jae Bon,Yang, Byung-Do,Oh, Jae-Mun Korean Physical Society 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.1
We demonstrate a novel organic antifuse technology on plastic at entirely plastic-compatible temperatures. All processes were performed at temperatures below 135 A degrees C. Our memory cell consists of a printed organic transistor and an organic capacitor. The data in the memory cell are selectively programmed by electrically breaking the capacitor. The organic capacitor acts like as an antifuse capacitor because it is initially open and becomes permanently shorted by applying a high voltage. The memory data are read out by sensing the current in the memory cell. The printed organic one-time programmable memory is suitable for storing small amounts of data such as in low-cost radio-frequency identification tag.