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- 저자 : ( Ki Woong Ro ) (검색결과 71 건)
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방기웅,류병로 한밭대학교 산업과학기술연구소 1993 논문집 Vol.1 No.-
Industrialization has been increasing the discharge of wastewater and requiring its proper management and treatment. Generally, joint treatment of municipal and industrial wastewater is advantageous technically and economically, however, it has difficulties in ensuring required treatment efficiency for different types of water quality and quantity. The purpose of this study is to evaluate the treatability on joint treatment of municipal and industrial wastewater, and to suggest simple method to treat effectively. For the study, selection and mixing of industrial wastewater, and investigation of BOD reaction and batch treating test for biodegradability were performed. From the BOD curve and reaction rate constant, it was possible to predict the biodegradable characteristic, and from the treatability test to mixing municipal-industrial wastewater, it was possible to determine effective mixing rate. Although this study was simply performed, it might be used to apply evaluation of biodegradability of joint treatment of municipal and industrial wastewater.
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류병로,방기웅,한양수 한밭대학교 산업과학기술연구소 1995 논문집 Vol.3 No.-
The growth of population and industrialization has been increasing the discharge of wastewater and requiring more intensive waste water treatment processes. This study was carried out to determine the optimal design conditions of a sewage treatment plant in the small city of Anjung. Also, we set out to find the operation guide data pertaining to the activated sludge process required by a city of this size. The biological reactors were operated with hydraulic retention times (HRT) of 12hr, 10hr, 8hr, 6hr and 4hr respectively, at the temperature of 20±1℃, using a mixture of raw wastewater. From the result of the experiments, we found that the removal efficiency increased as the F/M ratio decreased. From this conclusion we found that we could get the TBOD removal efficiency above 90% if the F/M ratio was less than 0.23 kg BOD/kg MSLL-day. for the reaction conditions with a hydraulic retention time of 8hrs, the removal efficiencies of BOD, TSS and VSS for sample #3 were 90%, 85% and 82% respectively.
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( Ki Woong Ro ),( Soo Hong Seo ),( Sang Wook Son ),( Il Hwan Kim ) 대한피부과학회 2011 Annals of Dermatology Vol.23 No.3
Background: Several differences in basal cell carcinomas (BCCs) were found, according to the ethnic group; for example, pigmented BCCs was more common in Asian or Hispanic patients. However, there are few reports on the subclinical extension of the BCC in Asian patients. Objective: The aim of this study was to evaluate the subclinical infiltration of the basal cell carcinoma in Asian patients. Methods: All patients with BCC who visited the department of dermatology at Korea University Ansan Hospital were treated with Mohs micrographic surgery. In 81 patients, 83 tumors of BCC were completely eradicated by Mohs micrographic surgery (MMS) from April 2001 to August 2008, and were reviewed in this study. Information recorded included the total margin and the number of stages of Mohs micrographic surgery, anatomic location, tumor size, presence of pigmentation, clinical type, and pathological subtype. We divided the clinical types into nodular, ulcerated, and pigmented, and the pathological types into nodular, micronodular, morpheaform, and adenoid. The BCC was of pigmented type if pigmentation covered more than 25% of the tumor, regardless of whether pigmentation was distinct, or if there was apparent pigmentation that covered more than 10% of the tumor. Results: The nose and cheek were the most common sites requiring more than one stage of surgery. In tumors smaller than 1 cm, 91.7% required only one stage of excision, compared with 60.6% in tumors larger than 1 cm. More than two Mohs stages were required in 25% of non-ulcerated BCCs and in 46.2% of ulcerated BCCs. Sixty eight percent of pigmented BCCs required only one stage of Mohs micrographic surgery. In cases of non-pigmented BCCs, only 45% required one Mohs stage. More than one Mohs stage was required in 19.2% of non-aggressive BCCs and in 42.9% of aggressive BCCs. Conclusion: Subclinical infiltration differed between the two groups according to the size of the BCC (1 cm threshold) and most of the BCCs were located in the head and neck area. Considering this result, indication for MMS can be extended for BCCs larger than 1 cm in Asian patients. Ulcerated BCCs required more Mohs stages than non-ulcerated BCCs. Pigmented BCCs might show lesser subclinical infiltration than non-pigmented BCCs. Aggressive pathological subtypes showed more subclinical infiltration than the non-aggressive types; however, after evaluation of the border that was excised with MMS, mixed histologic types were found to be more frequent than generally accepted. Therefore, we consider that, when planning surgery, dermatologists should not place too much confidence in the pathologic subtypes identified by biopsy.
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전자제품 제조업 교대 근로자의 성별에 따른 수면의 질과 피로도 차이
김기웅 ( Ki-woong Kim ),정은교 ( Eun-kyo Chung ),박해동 ( Hae Dong Park ),김갑배 ( Kab-bae Kim ),강준혁 ( Joon Hyuk Kang ),노지원 ( Jiwon Ro ),서회경 ( Hoe-kyeong Seo ) 한국산업보건학회 (구 한국산업위생학회) 2017 한국산업보건학회지 Vol.27 No.2
Objectives: Sleep quality is directly related to the health, quality of life and working capacity and is affected by age, gender, exercise, life habits. Gender dissimilarities in sleep quality are acknowledged. However, the gender difference in the quality of sleep in shift workers was not well known. Our aim was to study the less known gender differences in the quality of sleep of shift workers. Methods: 1,008 study subjects aged between 21 and 57 years among these, 637(525 male and 112 female workers) were daytime workers and 371(253 males and 118 female workers) were shift workers. Sleep quality was measured by self-report through the Pittsburg Sleep Quality Index(PSQI) and fatigue was measured by using the Chalder Fatigue Scale(CFS). All data was analyzed using SPSS version 19.0 program. The study was approved by the Institutional Review Board of the Occupational Safety and Health Research Institute. Results: Overall, sleep quality was found to be worse in shift workers than in daytime workers and in female than in male. Fatigue in shift female workers was significantly higher than in daytime female workers and shift male workers. In Spearman correlation analysis results, fatigue were significantly associated with gender, drink habit, regular exercise, working hours and sleep quality. With group male workers as the reference, the odds ratio(OR) for having a CFS was 2.115(β value=0.749, p<0.01), and subjective sleep quality, sleep latency, daytime dysfunction and PSQI were 1.541(β value=0.432, p<0.05), 2.297(β value=0.831, p<0.001), 1.798(β value=0.587, p<0.01) and 2.224(β value=0.799, p<0.01), respectively. Conclusions: Shift work played an important role in lowering the quality of sleep, and the effect was more pronounced in female workers than in male workers. Sleep quality was related to fatigue, especially sleep quality, sleep duration, sleep disturbances and daytime dysfunction were significantly related. Therefore, to improve fatigue and sleep quality of shift worker, it is necessary to improve healthy habits such as regular exercise, smoking cessation, and limited drinking. In particular, it is urgent to develop and implement a regular exercise program to reduce fatigue and improve the quality of sleep in workplace.
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Exposure Assessment for Toxic Hepatitis Caused by HCFC-123
Kim, Ki-Woong,Park, Hae Dong,Jang, Konghwa,Ro, Jiwon Occupational Safety and Health Research Institute 2018 Safety and health at work Vol.9 No.3
This case report attempts to present a case of acute toxic hepatitis in fire extinguisher manufacturing workers exposed to 2,2-dichloro-1,1,1-trifluoro-ethane (HCFC-123) in August 2017 in Korea. Twenty-two-year-old male workers were exposed to HCFC-123 for 1.5 hours one day and for 2.5 hours the other day, after which one worker died, and the other recovered after treatment. The workers were diagnosed with acute toxicity of hepatitis. However, exposure levels of HCFC-123 were not known with no work environment measurement done. Therefore, this study was conducted to estimate the exposure concentration of HCFC-123 via a job simulation experiment. In the simulation, the HCFC-123 exposure concentration was measured with the same working practice and working time as with the workers aforementioned. As a result, the workers who infused HCFC-123 into storage tanks were estimated to be exposed to HCFC-123 at a concentration of $20.65{\pm}10.81ppm$, and a mean concentration of area samples within a working radius were estimated as $70.30{\pm}18.10ppm$. Valve assembly workers working on valves of a fire extinguisher filled with HCFC-123 were exposed to HCFC-123 at concentrations of $91.65{\pm}4.03ppm$ and $115.55{\pm}7.28ppm$, respectively, in the simulation, and area samples simulated within the working radius were also found to be high with concentrations of $122.75{\pm}91.15ppm$ and $126.80{\pm}60.25ppm$, respectively. Nitrogen gas packing workers, who did not handle HCFC-123 directly, were exposed to the agent at a concentration of $71.80{\pm}8.49ppm$. These results suggest that exposure to HCFC-123 at high concentrations for 1.5-2.5 hours caused acute toxic hepatitis in two workers.
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Improvement of Dynamic Respiration Monitoring Through Sensor Fusion of Accelerometer and Gyro-sensor
Ja-Woong Yoon,Yeon-Sik Noh,Yi-Suk Kwon,Won-Ki Kim,Hyung-Ro Yoon 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.1
In this paper, we suggest a method to improve the fusion of an accelerometer and gyro sensor by using a Kalman filter to produce a more high-quality respiration signal to supplement the weakness of using a single accelerometer. To evaluate our proposed algorithm’s performance, we developed a chest belt-type module. We performed experiments consisting of aerobic exercise and muscular exercises with 10 subjects. We compared the derived respiration signal from the accelerometer with that from our algorithm using the standard respiration signal from the piezoelectric sensor in the time and frequency domains during the aerobic and muscular exercises. We also analyzed the time delay to verify the synchronization between the output and standard signals. We confirmed that our algorithm improved the respiratory rate’s detection accuracy by 4.6% and 9.54% for the treadmill and leg press, respectively, which are dynamic. We also confirmed a small time delay of about 0.638 s on average. We determined that real-time monitoring of the respiration signal is possible. In conclusion, our suggested algorithm can acquire a more high-quality respiration signal in a dynamic exercise environment away from a limited static environment to provide safer and more effective exercises and improve exercise sustainability.
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작업환경측정 지정기관의 분석실 현황 및 분석결과의 신뢰성에 영향을 주는 요인
김기웅 ( Ki-woong Kim ),박해동 ( Hae Dong Park ),김성호 ( Sungho Kim ),노지원 ( Jiwon Ro ),황은송 ( Eun Song Hwang ),정은교 ( Eun-kyo Chung ),조기홍 ( Kee Hong Cho ) 한국산업보건학회 (구 한국산업위생학회) 2018 한국산업보건학회지 Vol.28 No.1
Objectives: This study investigated to the analytical work environment, analyst's expert and status of analytical instrument in the designated organization's laboratory for measuring work environment, and carried out to ensure reliability of analytical results. Methods: This study was conducted by 114 analysts who work in designated organization's laboratory for measuring work environment. Information on the working environment and personal characteristics of the analysts were collected using a self-reported questionnaire and were analyzed using the SPSS program through analysis of frequency and t-test. Results: The speciality of subjects was occupational health (57.0%), environmental health (38.6%) and environmental engineering (4.4%), and they had a higher level of academic ability than workers in other industries. Analysts had to handle a large number of sample analysis and many tasks other than analytical work. The analysts answered that it was difficult to analyze organic substances than inorganic substances, and the difficult parts were the analytical methods setting of new substances (55.3%), instrument analysis (24.6%) and principle of analysis (23.7%). Analytical instruments mainly have legally required instruments. The difficulty of the analysis is solved from the senior analyst in the laboratory and analytical information is mainly exchanged through seminar organized by the Association of Occupational Health Analysts. The analysts who are planning to move or considering the company were 48.2%, and the reasons for moving the company were difficult to work (14.0%), low salary (9.6%), employment type (8.8%) and job stress (7.0%). Conclusions: The conclusions of our study were that it was possible to secure reliability by solving the problems such as implementing professional education to improve expertise of analysts, strengthening analytical instruments through institutional improvement and improving work environment.
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