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서일환,임국형,오미란,김경한,Suh Il-Hwan,Ihm Guk-Hyung,Oh Mi-Ran,Kim Kyung-Han 한국결정학회 1997 韓國結晶學會誌 Vol.8 No.1
실험적으로 측정된 변수의 함수인 물리양의 표준편차의 개산법이 제시되었다. A method for calculation of the estimated standard deviation (ESD) of physical quantities which are functions of experimentally observed variables has been shown.
서일환,이희주,위승환,이성원,김성겸 한국원예학회 2021 Horticulture, Environment, and Biotechnology Vol.62 No.5
Vegetable crops production in the fi eld and changes in physiological aspects of crops during the growing season may beaff ected by the increased temperatures associated with climate change. The objectives of this research were to evaluatethe performance of an air temperature gradient using the computational fl uid dynamics (CFD) technique and validation ofperformance throughout Kimchi cabbage growth and physiological responses to air temperature in a greenhouse temperaturegradient (GTG). We simulated temperature diff erences with CFD in a semi-closed plastic tunnel, which is a GTG. Theaccuracy of CFD improved by vertical and horizontal temperature profi les was evaluated for the performances of a GTG. Thegrowth of Kimchi cabbage was examined and validated using a temperature gradient within a GTG. Correlation coeffi cientsof measured heights were 1.120, 0.597, and 0.459. Root mean square error was below 0.103, which means the CFD simulationvalues were highly accurate. The error analysis showed that it was possible to accurately predict temperature gradientchanges within a GTG using CFD techniques. CFD results showed an average error of 0.597 °C compared to fi eld monitoringresults. The maximum temperature diff erence of the GTG was 5.7 °C, suggesting a well-controlled set point (6 °C diff erencebetween outside conditions and inside conditions of the GTG). On a cloudy day, the GTG set diff erential temperature(dT) was well maintained, while the accuracy of the GTG’s dT was degraded on sunny days because of interference by solarradiation. There was a signifi cant diff erence in the growth, net photosynthetic rate, transpiration rate, and intercellular CO 2concentration along with temperature diff erences in the GTG. CFD can simulate temperature gradient distribution in a GTGand predict the temperature diff erence for equipment with diff erent specifi cations. These facilities can be used in climatechange-related studies, such as assessment of crop production area optimization, crop physiological response to temperature,vulnerability assessment of crop production under increasing temperatures, or extreme weather.
Crystal Structure of 3-Methyl-4-Methoxy-4'-Nitrostilbene
서일환,김문집 한국결정학회 1992 韓國結晶學會誌 Vol.3 No.2
The crystal structure of the title compound was determined from single crystal X-ray dirt fraction study : C16H16NO3, Mr=271.316, orthorh ombic, Aba2, a=15.750(3), b=13.470(2), c=13.356 (2) A, V=2833A, Z=8, Dx=1.26 Mgm-3, λ(MoK a) =0.71069A, r=0.51mm-2, F(000)=1136, T=291 K, R=0.0414 for 728 unique observed [F≥3e(F)] reflections and 240 parameters. The molecule is nearly planar within 0.2 A with the torsion angle -179(2)°for C(4)-C(7)-C(8)-C(9).The into rmolecular interactions are mainly by van der Waals force with the nearest intermolecular distance 3.647A between O(3) and C(4) translated by half unit along band c-axes.
서일환,이천배,고동성,서정인 생화학분자생물학회 1992 BMB Reports Vol.14 No.2
The hydrolytic susceptibility of calf thymus DNA to DNase 1 was enhanced by such anionic Quinolone antibiotics as nalidixic acid and oxolinic acid in the presence of spermine, as well as by such cat-ionic intercalative agents as ethidium bromide, profavine, and actidine orange. In contrast with the susceptibility of the native DNA, the susceptibility of the denatured DNA was not affected by the quinolone antibiotics, not either by the cationic dyes. Even the native DNA, however, was not influenced by the anionic antibiotics in its susceptibility to DNase 1 if spermine was omitted. The data here may lead to a tentative contusion that the quinolone antibiotics may form intercalative complexes with spermine, and that thereby the quinolone antibiotics can be used as probes of DNA conformation, whereas the anionic antibiotics alone without spermine may not have the intercalation activity, as supported by the MO data.
서일환 한국농공학회 2020 한국농공학회논문집 Vol.62 No.1
Enclosed pig house are creating an environment with high concentrations of gas and dust. Poor conditions in pig farms reduce pig weight and increasedisease and accidents for livestock workers. In the pig house, the high concentration of harmful gas may cause asphyxiation accidents to workers andchronic respiratory disease by long-term exposure. As pig farm workers have been aging and feminized, the damage to the health of the harshenvironment is getting serious, and real-time monitoring is needed to prevent the damage. However, most of the measuring devices related to humidity,harmful gas, and fine dust except temperature sensors are exposed to high concentrations of gas and dust inside pig house and are difficult to withstandfor a long time. The purpose of this study is to develop an wearable based device to monitor the hazardous environment exposed to workers workingin pig farms. Based on the field monitoring and previous researches, the measurement range and basic specifications of the equipment were selected,and wearable based device was designed in terms of utilization, economic efficiency, size and communication performance. Selected H2S and NH3sensors showed the average error of 5.3% comparing to standard gas concentrations. The measured data can be used to manage the working environmentaccording to the worker’s location and to obtain basic data for work safety warning.
고병원성 조류인플루엔자 (HPAI)의 에어로졸을 통한 공기 전파 예측을 위한 공기유동학적 확산 모델 연구
서일환,이인복,문운경,홍세운,황현섭,권경석,김기연,Seo, Il-Hwan,Lee, In-Bok,Moon, Oun-Kyung,Hong, Se-Woon,Hwnag, Hyun-Seob,Bitog, J.P.,Kwon, Kyeong-Seok,Kim, Ki-Youn 한국농공학회 2011 한국농공학회논문집 Vol.53 No.1
HPAI (High pathogenic avian influenza) which is a disease legally designated as an epidemic generally shows rapid spread of disease resulting in high mortality rate as well as severe economic damages. Because Korea is contiguous with China and southeast Asia where HPAI have occurred frequently, there is a high risk for HPAI outbreak. A prompt treatment against epidemics is most important for prevention of disease spread. The spread of HPAI should be considered by both direct and indirect contact as well as various spread factors including airborne spread. There are high risk of rapid propagation of HPAI flowing through the air because of collective farms mostly in Korea. Field experiments for the mechanism of disease spread have limitations such as unstable weather condition and difficulties in maintaining experimental conditions. In this study, therefore, computational fluid dynamics which has been actively used for mass transfer modeling were adapted. Korea has complex terrains and many livestock farms are located in the mountain regions. GIS numerical map was used to estimate spreads of virus attached aerosol by means of designing three dimensional complicated geometry including farm location, road network, related facilities. This can be used as back data in order to take preventive measures against HPAI occurrence and spread.