수용모델(PMF)을 이용한 광주산업단지 VOCs의 오염원별 기여도 추정

박진환,박병훈,김승호,양윤철,이기원,배석진,송형명,Park, Jin-Hwan,Park, Byoung-Hoon,Kim, Seung-Ho,Yang, Yoon-Cheol,Lee, Ki-Won,Bae, Seok-Jin,Song, Hyeong-Myeong 한국환경과학회 2021 한국환경과학회지 Vol.30 No.3

Industrial emissions, mainly from industrial complexes, are important sources of ambient Volatile Organic Compounds (VOCs). Identification of the significant VOC sources from industrial complexes has practical significance for emission reduction. VOC samples were collected from July 2019 to June 2020. A Positive Matrix Factorization (PMF) receptor model was used to evaluate the VOC sources in the area. Four sources were identified by PMF analysis, including coating-1, coating-2, printing, and vehicle exhaust. The coating-1 source was revealed to have the highest contribution (41.5%), followed by coating-2 (23.9%), printing (23.1%), and vehicle exhaust (11.6%). The source showing the highest contribution was coating emissions, originating from the northwest to southwest of the sample site. It also relates to facilities that produce auto parts. The major components of VOC emissions from the coating facilities were toluene, m,p-xylene, ethylbenzene, o-xylene, and butyl acetate. Industrial emissions should be the top priority to meet the relevant control criteria, followed by vehicular emissions. This study provides a strategy for VOC source apportionment from an industrial complex, which is helpful in the development of targeted control strategies.

방식도막에 있어서 물의 흡수에 관한 연구

박진환,Park Jin-Hwan 한국전기화학회 1998 한국전기화학회지 Vol.1 No.1

방식도막의 수명에 가장 큰 영향을 미치는 물의 흡수과정을 quartz crystal microbalance법 및 임피던스 원리를 이용하여 연구하였다. 도막에 있어서 물의 흡수량과 전해질 농도 변화에 따른 도막의 capacitance를 조사하였다 방식도막에 대한 물의 흡수는 삼투압 작용에 의해서 이루어지고, 흡수 초기단계에서는 도막두께가 얇을수록 흡수량이 많은 것을 알 수 있었다 그리고 도막을 구성하고 있는 수지의 종류 및 결합 가교밀도에 따라서 흡수성이 큰 영향을 받는다는 것을 알 수 있었다. 또한 방식도막에 있어서는 접촉하는 전해질 용액의 농도 변화에 따라 흡$\cdot$탈수 현상이 발생하였으며, 같은 종류의 도막이라도 도막두께가 얇을수록 탈수현상에 따른 capacitance의 증가폭이 큰 것으로 나타났다 The water absorption in protective coatings, which may greatly influence the durability of these coatings, was studied using quartz crystal microbalance and electrochemical impedance technique. The water absorption in protective coatings and the change of coating capacitance with concentration of electrolyte were measured. The water absorption in coatings seems to be driven by osmotic pressure, and larger amount of water was absorbed in thinner coatings at initial stage of absorption. The amount of water absorbed in coatings changed with the type and crosslinking density of resin used in coating formulation. When water absorption and desorption of coating occured by exposing the coatings to electrolyte solutions of different concentration, increase in impedance caused by desorption of water was found to be higher in the case of thinner film.

Effects of Rural Roads on Farm Resource Use and Rural Life - A case study of alpine farming in Doam - Myon , Pyongchang - Gun , Kangwon - Do province -

박진환,이경원 ( Jin Hwan Park,Kyung Won Lee ) 한국농업경제학회 1969 農業經濟硏究 Vol.11 No.1

실리콘관을 이용한 코경유 눈물주머니코안연결술 후 발생한 급성 결막염의 임상적 고찰

박진환,장민욱,이태수,Jin-hwan Park,Minwook Chang,Tae Soo Lee 대한안과학회 2011 대한안과학회지 Vol.52 No.7

Purpose: To investigate the incidence and clinical course of acute conjunctivitis after endoscopic dacryocystorhinostomy (DCR) with silicone tube intubation. Methods: A retrospective study was conducted on 547 eyes in 517 patients who had undergone endoscopic DCR with silicone tube intubation between 2005 and 2009. The onset, incidence and symptoms of acute conjunctivitis, the effect of silicone tube intubation on acute conjunctivitis, and the effect of acute conjunctivitis on the success rate of DCR were investigated. Results: The incidence of acute conjunctivitis was 3.8%. The mean age of 21 patients with acute conjunctivitis was 52.6 ± 14.3 years and the mean follow-up period of those was 18.0 ± 6.4 months after surgery. All the cases of acute conjunctivitis were resolved with topical antibiotic treatment after silicone tube removal. The success rates between patients with and without conjunctivitis were not significantly different (80.95% and 88.97%, respectively; p = 0.282). However, 4 patients with surgical failure had a longer time from onset of acute conjunctivitis to the removal of the silicone tube than 17 patients with surgical success (0.22 months and 1.13 months, respectively; p = 0.047). A higher rate (76.2%) of conjunctivitis developed in patients with granuloma around the surgical ostium. Conclusions: A correlation may exist between acute conjunctivitis and granuloma in patients with DCR with silicone tube intubation. Acute conjunctivitis did not appear to influence the surgical results, although a delayed timing of silicone tube removal in patients with conjunctivitis could decrease the success rate. J Korean Ophthalmol Soc 2011;52(7):794-799

선천 상사근 결손 환아의 하사근 비측 전치술 치료 1예

박진환,차덕선,조윤애,서영우,Jin-hwan Park,MD,Deoksun Cha,MD,Yoonae A,Cho,MD,PhD,Young-Woo Suh,MD,PhD 대한안과학회 2010 대한안과학회지 Vol.51 No.7

Purpose: To report a patient with absence of the superior oblique (SO) muscle of the left eye, who showed improvement after anterior and nasal transposition of the inferior oblique muscle for left hyperdeviation and right head tilt. Case summary: A two-year-old boy presented with hypertropia of the left eye and right head tilt. Alternate prism-cover test in the primary position demonstrated 18 prism diopters (PD) of left hypertropia, which increased to 35 PD in the left head tilt position. A version test demonstrated overaction of the left inferior oblique muscle and underaction of the left superior oblique muscle. As an orbit CT scan showed absence of the SO muscle, the patient was diagnosed with congenital absence of SO and left anterior and nasal transposition of the inferior oblique muscle was performed. Three weeks after surgery, the patient presented with orthotropia at distant and near. The version test revealed normal oblique muscles. There was no vertical deviation shown on the Bielschowsky head tilt test. The abnormal head posturing was no longer observed. Conclusions: The authorsreport a patient manifesting abnormal head posture and hypertropia, diagnosed with absence of SO muscle, which was successfully corrected using anterior and nasal transposition of the inferior oblique muscle.

한국의 경제발전과 농업의 역할

박진환,Park, Jin-Hwan 한국과학기술단체총연합회 1987 과학과 기술 Vol.20 No.9

A Statistical Model for the Ultra-Wide Bandwidth Indoor Apartment Channel

박진환,이상협,방성일,Park Jin-Hwan,Lee Sang-Hyup,Bang Sung-Il The Institute of Electronics and Information Engin 2005 電子工學會論文誌-TC (Telecommunications) Vol.42 No.9

본 논문에서는 실제 아파트 환경에서 2000번의 주파수 응답에 의한 통계적 UWB 실내 채널 모델을 연구하였다. 측정은 서로 다른 방, 서로 다른 위치에서 이루어 졌으며, 실험 결과를 통해 채널의 전파특성을 이론적으로 설명하였다. Time-domain상에서 측정할 수 있는 channel impulse response (CIR)와 frequency-domain상에서 측정할 수 있는 channel transfer function (CTF) 측정방법을 제안하였다. 측정데이터를 통해서 CIR과 CTF를 비교하여 분석하였고, 통계적 경로손실 모델 또한 제안하였다. 신호 대역은 10MHz에서 8.010Hz까지 사용하였다. 측정결과를 통해 time-domain상에서 확인할 수 있는 maximum excess delay, mean excess delay, ms delay spread를 나타내었다. 송신기와 수신기에는 전방향의 biconical 안테나를 사용하였다. 또한 제안된 아파트 환경에서의 채널 모델은 UMB용 안테나 특성이 포함된 결과이다. We establish a statistical model for the ultra-wide bandwidth (UMB) indoor channel based on over 2000 frequency response measurements campaign in a Practical apartment. The approach is based on the investigation of the statistical properties of the multipath profiles measured in different place with different rooms. Based on the experimental results, a characterization of the propagation channel from theoretic view point is described. Also we describe a method for measurement of the channel impulse response and channel transfer function. Using the measured data, the authors compares channel impulse responses obtained from time-domain and channel transfer functions obtained from frequency-domain with statistical path loss model. The bandwidth of the signal used in this experiment is from 10MHz to 8.01 GHz. The time-domain results such as maximum excess delay, men excess delay and ms delay spread are presented. As well as, omni-directional biconical antenna were used for transmitter and receiver In addition, measurements presented here support m channel model including the antenna characteristics.

농지의 가격과 생산성 사이의 괴리현상의 지역간 차이에 관한 조사연구

박진환 ( Jin Hwan Park ) 한국농업경제학회 1989 農業經濟硏究 Vol.30 No.1

중소기업 임직원 교육의 학습내용 현업적용도 결정요인 연구

박진환(Jin-Hwan Park),김상순(Sang-Soon Kim),이춘우(Choon-Woo Lee) 대한경영학회 2014 大韓經營學會誌 Vol.27 No.5

BEHAVIORS OF FARM RESOURCES IN LIVESTOCK PRODUCTION ON SEMI - SUBSISTENCE FARM ORGANIZATION - A case study in the village of Pajang Ri , Kyung Gi Do province , Korea -

박진환 ( Jin Hwan Park ) 한국농업경제학회 1964 農業經濟硏究 Vol.7 No.1

N/A As the price of feed increases more than the price of livestock products the farm resources employed in livestock production on general farms were adjusted in significant degree with respect to the price changes. However, the adjustments of the farm resources differ by individual livestocks due to the differences in the purpose of raising individual livestocks, in the components of feed inputs, and in the divisibilities of the individual livestocks, etc. The draft cattle on general farm is being raised mostly [by the by-products and roughages available on the farm. For an average farm, a draft cattle exhaust most of the by-products and roughages on the farm. For feeding of poultry and hogs, the purchased feeds are the important part of the total feed inputs. Therefore, the relative price changes for feed and livestock products at the market affect less in the draft cattle raising than in poultry and hog production. Animal power and manure are the indispensable factors for crop production on gen eral farms. Because of the necessity of the animal power, the farm resources employed for draft cattle is less responsive with respect to the relative price changes for feed and livestock products compared to the farm resources in poultry and hog production. As the price of feed increases more than the price of livestocks, farmers tend to combine the livestocks which will exhaust the available feed sources on the farm by reducing the expense for purchased feeds. For this purpose, a cattle will preferably be chosen. Two cattles are too large animal units for the available feed sources, but one cattle may not exhaust all the available feeds. After choosing a cattle, small units of hog or poultry are added for an exhaustive use of the remaining feeds. The price situation of feeds in the recent years was unfavorable for livestock production. Therefore, farmers are making efforts to get higher cash income from the cattle which was chosen primarily for power services. The frequency of buying and selling of cattles by farmers are increasing to get higher margin from the exchange. Small size farms are feeding a calf by field grasses during the summer season to get more cash income.