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Evaluation of the dermatologic life quality among cleanroom workers in a secondary battery factory
Jae Jung Cheon,Jun Young Uhm,Gu Hyeok Kang,Eun Gye Kang,Soo Young Kim,Seong Sil Chang 대한직업환경의학회 2016 대한직업환경의학회지 Vol.28 No.-
Background: Cleanroom air is extremely dry, as it is maintained within 1 % of relative humidity. Few studies have assessed the dermatologic life quality of workers in ultralow-humidity environments. Therefore, we aimed to evaluate the dermatologic life quality of cleanroom workers using the Skindex-29, compared to those of non-cleanroom workers. Methods: Study participants were 501 cleanroom workers and 157 non-cleanroom workers from a secondary battery factory, who underwent an employee health examination at a single university hospital from September 2014 to September 2015. Results of the self-administered Skindex-29, and McMonnies questionnaire were analyzed. Other information and disease history were also collected during physician’s medical examination. Descriptive and multivariate logistic regression analysis were performed. Results: The Skindex-29 score was significantly higher in cleanroom workers than in non-cleanroom workers for all domains, Symptom (16.0 ± 15.9 vs. 6.3 ± 10.2, p < 0.001), Emotion (11.3 ± 17.4 vs. 2.5 ± 7.4, p < 0.001), Function (5.2 ± 11.1 vs. 1.6 ± 4.0, p < 0.001), and Overall (10.8 ± 13.4 vs. 3.5 ± 6.2, p < 0.001). The Skindex-29 score of cleanroom workers was similar to that of patients with skin diseases such as psoriasis, other dermatitis, corns, alopecia etc. Among the cleanroom workers, 37 workers had one or more skin diseases. Among the risk factors, ‘working at cleanroom’, ‘possessing skin disease’ and ‘McMonnies score’ had significant strong correlations with Skindex-29 score, meanwhile age, sex, smoking, drinking and exercise had weak correlations with it. ‘Working at cleanroom’ and ‘possessing skin disease’ had highest odds ratios with overall 14.0 (C.I.: 5.9–33.1) and 13.4 (C.I.: 4.5–29.2), and the lowest odds ratios with function domain 3.5(C.I.: 1.7–7.1) and 4.5(C.I.: 2.1–9.5), respectively. The McMonnies score had the highest odds ratio with overall, 6.9(C.I.: 4.5–10.8) and lowest odd ratio with emotion domain 4.2 (C.I.: 2.7–6.4). Conclusions: Dermatologic life quality among cleanroom workers in the secondary battery factory is shown to be lower than that among non-cleanroom workers in this study. The study suggests that the Skindex-29 may provide helpful information on the dermatologic life quality of cleanroom workers. Therefore, regarding evaluation of dermatologic life quality using Skindex-29, preventive care is necessary for cleanroom workers in ultralow humidity environment.
일유체 노즐을 이용한 실내 수분무가습 방식 클린룸의 에너지소비량에 관한 실험적 연구
송원일(Won-Il Song),박수빈(Su-Bin Park),김기철(Ki-Cheol Kim),유경훈(Kyung-Hoon Yoo),태경응(Kyung-Eung Tae),김용식(Yong-Sik Kim),양지석(Ji-Seok Yang),송덕용(Deog-Yong Song),권오명(Oh-Myoung Kwon),이건형(Kun-Hyung Lee) 대한설비공학회 2018 설비공학 논문집 Vol.30 No.11
For a recent large-scale semiconductor manufacturing plant, the air conditioning energy consumption required to maintain a cleanroom environment accounts for 40~50% of the total energy consumption in the plant. Therefore, the assessment of the air conditioning energy consumption in the cleanroom is critical for reducing energy cost in the plant. Particularly, the energy consumption required to humidify incoming outdoor air in the winter season is generally known to be high. In order to displace the huge energy consumption of steam generators like boilers in a conventional steam humidification type cleanroom, a water spray humidification technique by use of a water spray nozzles can be introduced into the air circulation path inside the cleanroom instead of the steam generators inside the outdoor air conditioning system. In the present study, a twin cleanroom experiment with each outdoor air flow of 2,300 ㎥/h was conducted to obtain and compare real time electric power consumption structures of a steam humidification type cleanroom and an indoor water spray humidification type cleanroom with one-fluid nozzles. In addition, a numerical calculation was carried out to assess the annual power consumptions of the two types of cleanrooms. It was concluded from the present work that the indoor water spray humidification type cleanroom was more energy-efficient and reduced the annual electric power consumption of the steam humidification type cleanroom by about 27%.
한상목,황영규,김동권 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.11
Contamination in a cleanroom may appear even more complicated by the effect of complicated manufacturing processes and indoorequipment. For this reason, detailed information about the concentration of pollutant particles in the cleanroom is needed to control thelevel of contamination financially and efficiently without any problem in manufacturing process. Allocation method has been developedas one of main ideas to fulfill a function of controlling contamination under the situation. By using this method, weighting factor can bepredicted based on cleanliness on sampling spots and the values based on numerical analysis. In this point, the weighting factor indicateshow each of contaminant sources influences the concentration of pollutant in the cleanroom. In this paper, when applied allocation method,we propose zoning method to accelerate the calculation time. And it was applied to cleanliness the actual improvement of the turbulenttype clean room. As a result, we could estimate quantitatively the amount of contamination generated from the pollution sources. And was proved by experiments that it is possible to improve the level of cleanliness of the cleanrooms by using these results.
반도체 클린룸용 외기공조시스템의 수분무 가습을 이용한 에너지절감에 관한 연구
송원일,김기철,유경훈,신대건,태경응,김용식,박덕준,Song, Won-Il,Kim, Ki-Cheol,Yoo, Kyung-Hoon,Shin, Dae-Kun,Tae, Kyung-Eung,Kim, Yong-Sik,Park, Dug-Jun 한국입자에어로졸학회 2017 Particle and Aerosol Research Vol.13 No.2
In recent large-scale semiconductor manufacturing cleanrooms, the energy consumption in outdoor air conditioning (OAC) systems to heat, humidify, cool and dehumidify outdoor air(OA) represents about 40~50 % of the total cleanroom power consumption required to maintain cleanroom environment. Therefore, the assessment of energy consumption in outdoor air conditioning systems is essential for reducing the outdoor air conditioning load for a cleanroom. In the present study, an experiment with an outdoor air flow rate of $1,000m^3/h$ was conducted to compare the energy consumption in steam humidification, simple air washer, exhaust air heat recovery type air washer and dry cooling coil(DCC) return water heat recovery type air washer OAC systems. Besides, a numerical analysis was carried out to evaluate the annual energy consumption of the aforementioned four OAC systems. It was shown that the simple air washer, exhaust air heat recovery type air washer and DCC return water heat recovery type air washer OAC systems using water spray humidification were more energy-efficient than the steam humidification OAC system. Furthermore the DCC return water heat recovery type air washer OAC system was the most energy-efficient.
Acute liver injury in two workers exposed to chloroform in cleanrooms: a case report
Young Joong Kang,Jungho Ahn,Yang-In Hwang 대한직업환경의학회 2014 대한직업환경의학회지 Vol.26 No.-
We report 2 cases of hepatotoxicity in cleanroom workers due to high retained chloroform air concentrations. The women, aged 34 and 41 years, who had been working in a medical endoscopic device manufacturer as cleanroom workers for approximately 40?45 days suffered severe liver damage. Two measured time-weighted averages of the chloroform concentration in the air in the cleanroom were 82.74 and 64.24 ppm, which are more than 6 times the legal occupational exposure limit in Korea. Only 7% of the cleanroom air was newly introduced from outside. The clinical courses of these cases and workplace inspection, led us to conclude that both cases of hepatotoxicity were caused by chloroform exposure.
重合格子座標系를 使用하는 氣流解析 方法에 의한 非單一方向流 클린룸의 裝置 레이아웃 檢討
김용식,오중근,諏訪好英 대한건축학회 2004 대한건축학회논문집 Vol.20 No.11
Recently, several kinds of computational airflow simulation techniques are applied to the design of cleanrooms airflow performance. Howeve, these computational airflow simulation systems require much labor to setup the data of cleanroom configurations. especially when the cleanroom consists of complicated flow field. In this research work. a new type of computational airflow simulation system applicable to the complicated flow field problems with simple in-put data was developed. This system adopts the patched-type composite grid system, and the field data is treated as the composition of simple fields. This paper describes the outline of the computational airflow simulation system and some application results on the machine-layout problem in non-unidirectional airflow cleanroom. As the result of test applications, it was found that the computational airflow simulation system has powerful performance on solving the complicated flow field problems.
Ji, Jun Ho,Woo, Daekwang,Lee, Seung-Bok,Kim, Taesung,Kim, Duckjong,Kim, Jae-Hyun,Bae, Gwi-Nam Informa Healthcare USA, Inc. 2013 Inhalation toxicology Vol.25 No.14
<P>Release of nanomaterials was assessed in a cleanroom workplace designed for the handling of multi-walled carbon nanotubes. During the process, the nanotubes were sprayed in a chamber fitted with an exhaust duct system. The front door of the spraying chamber was completely closed, but rear end of the chamber was partially open. Throughout a series of spray processes, three detectors - an optical particle counter, a nanoparticle aerosol monitor, and an aethalometer - counted and characterized particles escaping the chamber. Concentrations of particle surface area and black carbon emitted by the spraying were assessed assuming zero background aerosol concentration in the cleanroom. Very low concentrations of black carbon, 0.4 μg/m<SUP>3</SUP>, were observed. In conclusion, in a cleanroom, low concentrations of nanomaterials were detected to be emitted from a spraying chamber into the workplace. The level of particles reaching the workplace was sufficiently low to have made their detection difficult in a normal environment. Both target nanomaterial and non-intended incidental nanomaterials were released during spraying. Despite the use of exhaust duct system in the process chamber, workers would be exposed to some particles if the chamber were partially open. The exhaust duct system was not enough to remove all the particles released in the chamber.</P>
반도체 클린룸의 다양한 피드백 제어 방식에 대한 실내온도 과도응답 및 에너지소비 평가
유경훈,송근수,정준수,김춘식,양지석,이건형 대한기계학회 2023 大韓機械學會論文集B Vol.47 No.5
This paper presents the transient responses of indoor temperature and the energy consumption of various feedback control schemes for a typical semiconductor manufacturing cleanroom. The feedback control schemes include on/off, proportional-integral-derivative (PID), artificial neural network (ANN), and model predictive control (MPC) controllers with saturation capability. Control block diagrams are created in the cleanroom using the MATLAB/Simulink platform for indoor temperature control with a constant humidity ratio. The simulation results for the initial one-hour duration indicate that the properly tuned PID control scheme with saturation is more energy efficient than the other schemes. However, it is demonstrated that the ANN and MPC controllers can respond faster than the PID controller while providing zero overshoot output. 본 논문에서는 일반적인 반도체 클린룸에 대해 다양한 피드백 제어 방식에 따른 실내 온도와 에너지 소비량의 과도 응답을 제시한다. 본 피드백 제어에 도입한 제어기는 포화(saturation) 기능이 있는 on/off, PID, ANN 및 MPC 제어기이다. MATLAB/Simulink 플랫폼을 활용하여 클린룸 내부에서 일정한 절대습도 조건에서의 실내 온도 제어를 위한 제어 블록 선도가 개발되었다. 초기 1시간 동안의 시뮬레이션 결과로부터 적절하게 조정된 PID 제어 방식이 다른 제어 방식들보다 에너지 소비량이 가장 낮은 것으로 나타났다. 그러나 ANN 및 MPC 컨트롤러를 사용하면 PID 컨트롤러에 비해 더 빠른 응답을 제공하고 제로 오버슈트 출력을 제공함을 관찰하였다.