여수국가산업단지 인근 지역 대기오염물질 농도에 영향을 미치는 요인분석

김민영,변정훈,이영훈,이건영,한지은,이예림,임지현,장봉기 순천향대학교 기초과학연구소 2022 순천향자연과학연구 논문집 Vol.28 No.1,2

Eight monitoring stations in the Yeosu National Industrial Complex will determine the concentration of air pollutants measured every hour in 2019, analyze what factors affect them, and how they correlate with the air pollutant measurements. Six air pollutants (SO2, NO2, O3, CO, PM-10 and PM-2.5) measured at eight monitoring stations around Yeosu National Industrial Complex (Seogang-dong, Wolnae-dong, Munsu-dong, Yeocheon-dong, Deokchung-dong, Hwayang-myeon, Yulchon-myeon, Samil-dong) the measurement data for each hour of the year were downloaded to analyze the concentration by weather condition, time zone, season, separation distance from Yeosu Industrial Complex, and separation distance from Gwangyang Industrial Complex. SO2, NO2, and CO concentrations were significantly higher in winter, significantly lower in summer, and O3, PM-10, and PM-2.5 concentrations were significantly higher in spring. SO2, CO, PM-10, and PM-2.5 concentrations were significantly higher between 10 a.m. and 12 p.m., NO2 concentrations were significantly higher between 7 a.m. and 9 a.m., and O3 concentrations were significantly higher between 13 p.m. and 15 p.m.(p<0.001). The concentration of air pollutants (SO2, NO2, CO, PM-10, PM-2.5) excluding O3 was found to have a negative (-) correlation with weather condition, and in the case of O3, it was found to have a positive (+) correlation with PM-10, PM-2.5, temperature and wind speed. It was confirmed that the concentration of air pollutants emitted from the Yeosu National Industrial Complex differs depending on the season, time and distance to the industrial complex. This study aims to establish measures to minimize health damage to residents living relatively close to the industrial complex and contribute to the establishment of management and response measures according to the properties of substances to reduce the concentration of air pollutants in the future.

석면함유 슬레이트 지붕 물받이 퇴적물 중 석면 섬유 함유율

임지현,한솔민,김현석,신유민,박시은,허정윤,김민영,장봉기 순천향대학교 기초과학연구소 2022 순천향자연과학연구 논문집 Vol.28 No.1,2

This study attempted to determine the degree of asbestos release from the aging slate roof by comparing the asbestos content in the slate roof rain gutter with a colored steel plate (tin plate) over the slate roof. Four slate roof houses located in Haengmok-ri, Asan-si, Chungcheongnam-do, and one house constructed with a colored steel plate on the slate roof were selected to collect the sediment of the roof rain gutter. The asbestos fiber content was calculated by a point counting method using a polarization microscope after pretreatment with conversion treatment and hydrochloric acid treatment. The average asbestos content of the four slate roof rain gutter were 1.89%. However, asbestos was not detected in the Slate covering roof rain gutter, which were constructed on the slate roof. Asbestos fiber content was the highest at 2.89% in the slate roof rain gutter installed in 1976, followed by 2.44% in 1953. From the above results, it is necessary to minimize secondary damage as asbestos fibers released from slate roof houses to the surrounding atmosphere or leaked from slate roofs as rainwater may cause soil pollution and seriously affect residents' health. Although covering with colored steel plates (tin plates) has been shown to prevent the leakage of asbestos fibers to some extent, it is believed that a policy alternative to remove the slate roof as soon as possible is needed to solve the fundamental problem.

다발성 골수종에서 저용량 thalidomide, cyclophosphamide, dexamethasone (TCD) 요법의 효과

류충헌,정재현,고정해,장제혁,박영진,최규남,박봉수,이상민,주영돈 인제대학교 2008 仁濟醫學 Vol.29 No.-

Background and Objectives : The immunomodulatory drug thalidomide can inhibit angiogenesis and induce apoptosis in experimental models. It can also induce marked and durable response in newly diagnosed myeloma patients. Thalidomide has been used at doses ranging from 200 to 800 mg with significant toxicity. No data are available on the impact of low-dose thalidomide, cyclophosphamide and dexamethasone as initial therapy for myeloma patients. Design and Methods : To address this issue, newly diagnosed myeloma patients were treated with 50 mg/day thalidomide continuously and cyclophosphamide 150 mg/m², days 1-4 and dexamethasone 20 mg/m², days 1-5 and day 15-19, every month. Between October 2005 and October 2006, 14 patients (median age 54.5 years) were treated with low-dose thalidomide, cyclophosphamide and dexamethasone. Results : After a minimum of two cycles of treatment, 5 patients (55.5%) showed a partial remission. After four cycles of treatment, 10 patients (83.3%) showed a partial remission (n=6) and complete remission (n=4). After a median follow-up of 15.4 months, 1 year overall survival rate was 82.0%. Thalidomide was well tolerated without serious toxic effects. Conclusions : The combination of low-dose thalidomide, cyclophosphamide and dexamethasone demonstrates favorable response rate and 1 year overall survival rate in newly diagnosed myeloma. Severe toxicities were not seen with this combination.

Photoionization of N,N,N',N'-Tetramethyl-p-phenylenediamine in Polar Solvents

Min Yeong Lee,Du Jeon Jang,Minyung Lee,Du-Jeon Jang,Dongho Kim,Sun Sook Lee,Bong Hyun Boo Korean Chemical Society 1991 Bulletin of the Korean Chemical Society Vol.12 No.4

The photoinduced electron transfer reactions of N,N,N',N'-tetramethyl-p-phenylenediamine (TMPD) in various polar solvents were studied by measuring time-resolved fluorescence. The temperature dependence on the fluorescence decay rate in acetonitrile, methanol, ethanol and buthanol was carried out to obtain the activation energy and Arrehnius factor for the photoinduced electron transfer reaction. It was found that as the dielectric constant of the solvent increases, the activation energy and the reaction rate increase. This implys that the Arrehnius factor is important in controlling the photoinduced electron transfer reaction rate. In water, TMPD exists in three forms (cationic, protonated and neutral forms) due to the high dielectric constant and strong proton donating power of water. The photoinduced electron transfer reaction was found to be very fast (< 50 ps) and also the long liverd component in the fluorescence decay profile attributable to the photoexcited protonated form of TMPD was observed. Probably, the reaction pathway and the reaction coordinate seem to be different depending on the solvents studied here.

Estimation and Prediction-Based Connection Admission Control in Broadband Satellite Systems

Jang, Yeong-Min Electronics and Telecommunications Research Instit 2000 ETRI Journal Vol.22 No.4

We apply a "sliding-window" Maximum Likelihood(ML) estimator to estimate traffic parameters On-Off source and develop a method for estimating stochastic predicted individual cell arrival rates. Based on these results, we propose a simple Connection Admission Control(CAC)scheme for delay sensitive services in broadband onboard packet switching satellite systems. The algorithms are motivated by the limited onboard satellite buffer, the large propagation delay, and low computational capabilities inherent in satellite communication systems. We develop an algorithm using the predicted individual cell loss ratio instead of using steady state cell loss ratios. We demonstrate the CAC benefits of this approach over using steady state cell loss ratios as well as predicted total cell loss ratios. We also derive the predictive saturation probability and the predictive cell loss ratio and use them to control the total number of connections. Predictive congestion control mechanisms allow a satellite network to operate in the optimum region of low delay and high throughput. This is different from the traditional reactive congestion control mechanism that allows the network to recover from the congested state. Numerical and simulation results obtained suggest that the proposed predictive scheme is a promising approach for real time CAC.

Cascaded Neural Network Framework for Classification of Functional piRNAs

Yeong Min Jang(장영민),Mobeen Ur Rehman(레흐만 모빈우르),Kil To Chong(정길도) 대한전자공학회 2022 대한전자공학회 학술대회 Vol.2022 No.4

Red Ginseng Inhibits Exercise-Induced Increase in 5-Hydroxytryptamine Synthesis and Tryptophan Hydroxylase Expression in Dorsal Raphe of Rats

Min, Yeong-Ki,Chung, Seok-Hee,Lee, Jong-Soo,Kim, Sung-Soo,Shin, Hyun-Dae,Lim, Baek-Vin,Shin, Min-Chul,Jang, Mi-Hyeon,Kim, Ee-Hwa,Kim, Chang-Ju WHO COLLABORATING CENTRE FOR TRADITIONAL MEDICINE 2003 東西醫學硏究所 論文集 Vol.2003 No.-

Red ginseng has been used as an ergogenic aid for endurance exorcise. In this study, the effect of aqueous extract of Red ginseng on the endurance in treadmill exorcise and 5-hydroxytryptamine (serotonin) synthesis and tryptophan hydroxylase expression in the dorsal raphe of rats were studied. Rats receiving Red ginseng showed increased time to exhaustion for treadmill running. and Red ginseng treatment inhibited exorcise-induced increases in 5-hydroxytryptamine synthesis and tryptophan hydroxylase expression in the dorsal raphe. These results suggest that the suppressive effect of Red ginseng on serotonin level during exercise is a possible ergogenic mechanism of Red ginseng.

A Priority Scheme for IEEE 802.11 Wireless LAN

Jang, Yeong-Min The Korea Institute of Information and Commucation 2000 韓國通信學會論文誌 Vol.25 No.12

This paper investigates a priority scheme for IEEE 802.11 Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) protocol in order to provide short access times for priority frames (e.g. time-deadline traffic) even when the overall traffic on the wireless channel is heavy. Under the compatibility constraint for the IEEE 802.11 wireless LANs, two priority systems are simulated: no priority (current IEEE 802.11 standard) for time-deadline traffics and dynamic time-deadline priority. We evaluate algorithms to improve the time-deadline traffic performance using discrete event simulation (DES)

객혈에 대하 기관지경검사의 진단적 의의

장중현 ( Jang Jung Hyeon ),이홍렬 ( Lee Hong Lyeol ),곽승민 ( Gwag Seung Min ),김세규 ( Kim Se Gyu ),장준 ( Jang Jun ),안철민 ( An Cheol Min ),김성규 ( Kim Seong Gyu ),이원영 ( Lee Won Yeong ) 대한내과학회 1993 대한내과학회지 Vol.44 No.6

연구배경 : 객혈은 원인은 매우 다양한 비록이적인 증상으로, 원인을 알 수 없거나 반복적으로 계속되는 경우 원인 병소를 찾기 위해 가장 널리 이용되는 진단법이 굴곡성 기관지경검사이다. 특히 기관지경은 객혈의 원인중 꼭 감별해야 할 질환의 하나인 폐암의 조직학적 진단을 위해서도 필수적인 검사라고 생각된다. 방법 : 객혈로 기관지경을 시행받은 479명의 환자들을 대상으로 임상적인 조사를 하였다. 결과 : 1) 결핵의 원인질환으로는 활동성 폐결핵이 가장 많았고 다음으로 만성기관지염, 폐암, 그리고 기관지확장중의 순이었다. 2) 객혈 환자의 기관지경검사상 진단은 기관지염, 활동성 폐결핵, 그리고 폐암의 순이었다. 3) 기관지경상 출혈부위를 찾은 경우는 전체의 47.2%이었고, 이중 좌엽 및 우엽이 비슷한 발생빈도를 보였으며 특히 양측 상엽에서 많이 관찰되었다. 4) 혈담을 유발시키는 주요 원인질환은 만성기관지염, 활동성 폐결핵 그리고 폐암 등이었고 1일 200mL이상 대량객혈의 주요 원인질환은 활동성 폐결핵, 기관지확장증 및 폐국균종 등이었다. 5) 원발성 폐암 환자군과 비폐암 환자군 간의 임상적 특성을 구분하여 본 결과 연령이 증가할수록(특히 50세 이후), 흡연력이 있는 경우, 그리고 혈담이 한달 이상 지속되는 경우 폐암으로 진달될 가능성이 높다고 판단되었다. 결론 : 이상의 결과로 객혈 환자에 대한 굴곡성 기관지경검사는 객혈의 원인 진단에 있어 필수 불가결한 검사법임을 알 수 있었다. Background : Hemoptysis being a nonspecific symptom often presents a diagnostic dilemma, requiring the aid of even flexible bronchofiberscopy, a novel approach, for disgnosis, especially in the cases where hemoptysis attack is repetitive or where diagnosis is tentative at best. Bronchoscopy is essential for pathologic diagnosis of lung cancer, which must be differentiated from other causes of hemoptysis. Methods : The authors evaluated a total of 479 patients who underwent bronchoscopy for the purpose of diagnosis of hemopysis. Results : 1) Active pulmonary tuberculosis was the most common cause of hemoptysis, followed by chronic bronchitis, lung cancer, and bronchiectasis. 2) The most common diagnosis by bronchoscopy was bronchitis, followed by active tuberculosis, and lung cancer. 3) It was possible in 47.2 percent of cases to identify bleeding points on bronchoscopy. The bleeding sites were most frequent in both upper lobes without predilection for each lung. 4) The most common cause of blood-tinged sputum was chronic bronchitis, active tuberculosis, or lung cancer, whereas massive hemoptysis i.e., more than 200mL of blood a day, was the result of active tuberculosis, bronchiectasis, or aspergilloma.5) Advanced age (especially more than 50 years), history of smoking or more than one month of blood-tinged sputum were significantly more common in the patients with than without lung cancer. Conclusion : Flexible bronchofiberscopy is essential for the diagnosis of underlying causes of hemoptysis. The high incidence of active tuberculosis and tuberculosis-related diseases in our patients seems to reflect this hospital being a tertiary care center to which often the problem cases are referred.

영상처리와 벡터 플롯을 이용한 기저동맥의 굴곡률 측정 알고리즘 연구

장영민(Yeong-min Jang),정길도(KIL TO CHONG),김지홍(JEEHONG KIM) 대한전기학회 2021 정보 및 제어 심포지엄 논문집 Vol.2021 No.4