대구지역 영세사업장의 작업환경 측정실태와 인식도

이성미,이종영,김두희,이종화,장봉기 순천향대학교 산업의학연구소 1996 순천향산업의학 Vol.2 No.1

This study was conducted to examine both actual status and understanding of the workshop environment of the small sized companies with 30 or less employees in and around Taegu city, Korea by analysing the questionnaire with 400 small sized manufacturing companies from the end of Mar. to the end of June 1993 according to their employee number and business type. The result of this study is summarized as follows. The job title of the respondents showed that the president accounted for 34.3% which was highest, particularly, which showed the highest percent in the companies with 5-9 employees. The management of workshop environment indicated that the response of 'Very Necessary' accounted for 52.0% which was higher. Thus it was shown that the owner and manager's understanding of the workshop environment was higher. However, the response of 'No Enough Money' for investment in improvement of workshop environment indicated that the president accounted for 51.1% which was also higher. 54.3% of all subjects considered their workshop environment as not good, while 66.5% answered that the workshop environment has effect on the health of employees. The actual status of industrial accidents occurred from January to December 1992 showed 18.7% frequency, while their business type was that the metal and machinery industries accounted for 24.8%. In addition, their size indicated that 16-29 employees accounted for 26.5% which was higher than that of other companies with different sizes. Regarding the question of understanding whether their workshop is the subject required for measuring the workshop environment, it was shown that the response of 'No Understanding' accounted for 57.0%. Based on their size, the companies with 5-9 employees accounted for 37.6%, while on their business types the metal and machinery industries accounted for 31.2% which showed the lowest understanding. In case of the companies understanding as the subject required for measurement of their workshop environment, the harmful element acting as a problem in their workshop indicated that the response of 'Too Noisy' accounted for 37.8%, and 'Too Serious Dust' for 11.8%, when the noise appeared as the most serious harmful element in all workshops. Among the companies required for measuring the workshop environment, it was shown that the workshops which did not carry out the required measurement accounted for 24.4%. Of the workshops which carried out the measurement required for their workshop environment, the frequency of annual two times accounted for 40.1% which was highest. Based on their size, it was shown that the companies with 16-29 employees accounted for 52.6% which was highest. The use of their measured data and execution of required improvement showed that the response of 'Good' was totally high. Also the keeping result of their measured list indicated that the response of 'Good' accounted for 72.3%. Based on the above result, the understanding of needs for control of workshop environment was high. However, the actual improvement of workshop environment was not so active as their understanding. Because the health of all employees is closely related to the harmful workshop environment and working conditions, it will be necessary for the government to support the improvement of workshop environment of these small sized companies with insufficient capability of investment, to suggest its direction and to continuously encourage and inspect their measurement of workshop environment.

유해 중금속 함유 슬러지의 고화처리시 수분함량 및 시멘트함량이 미치는 영향

이종화,박종안,장봉기,손부순,허준무 순천향대학교 기초과학연구소 1998 순천향자연과학연구 논문집 Vol.4 No.1

The purpose of this study was to investigate the effect of mix ratio on the compressive strength and the hazardous heavy metal leachability from the solidified waste. The solidification process utilized in this study was cement-based technique since its performance was superior to other process techniques. The mix ratio applied in this study varied from 0.05 to 0.30 because higher mix ratio need to large amount of cement and landfill area to be occupied by solidified waste. Sludge obtained from a electroplating industry was used for the solidification process. Moisture contents of the sludge were 30% and 60 % of sludge to be solidified. The moisture content of 30% was selected as a relatively low moisture content while 60% of moisture was a typical one in the solidification field. Typical hazardous metal such as lead, copper, cadmium was selected for leachability test. the results of the study indicated that there could be exist optimum mix ratio to exhibit the maximum compressive strength of the solidified waste especially when low moisture content of sludge was solidified. The same trend was observed when water/cement ratio was applied instead of mix ratio. The optimum mix ratio and water/cement ratio for the 30% of moisture content of sludge were 0.1 and 3, respectively. As the compressive strength of the solidified wasters increased, the leachability of Cu, Pb, and Cd was decreased. Pb may be bound into the silica matrix rather than being in the pores, while Cu and Cd could be bound by physical isolation of concrete matrix.

아산시의 환경보전을 위한 수질(하천 및 호소)오염 실태조사 및 대책

이종화,박종안 순천향대학교 기초과학연구소 1996 순천향자연과학연구 논문집 Vol.2 No.1

The object of this study is to survey water quality of river and reservoirs in Asan city. We also suggest some alternatives for environmental preservation toward sustainable urban development of Asan city. This study analyzes water quality(pH, DO, BOD, COD, SS, Pb, Cd, T-P and T-N) of river and reservoirs. First, the level of water quality of Kodyke river is in the range of level Ⅱ-Ⅲ lower than the level Ⅲ established by the Ministry of Environment. Heavy metal pollution was not observed. Second, the level of water quality of small reservoirs is in the range of level Ⅳ-Ⅴ higher than the level Ⅲ established by the Ministry of Environment. Especially, water quality of Sinchang and Shinchung reservoir is worser than that of other reservoirs. Water quality of Asan and Sapkyo lakes is the range of level Ⅲ-Ⅴ. As the level of T-P and T-N is level Ⅳ and level Ⅴ, respectively, eutrophication might be progressed. Kogkyo river and reservoirs in Asan city is alreadlly very polluted by inflow of wastewater from residents, animal husbandries and industries. Recently, Metropolitan Area Development Planning(MADP) for Asan bay-area was suggested by the Ministry of Construction. According to this plan, industrialization and urbanization of Asan area will rapidly progress. If sewage and wastewater treatment facilities are not provided, water quality of river and reservoirs in Asan city will be worse. In order to prevent of environment pollution, first, the impact of industrialization and urbanization of Asan area on the environment should be considered at the beginning of MADP. Second, total effluent regulation of water pollution, air pollution and soil wastes, based on the self-purification of the Asan city environment, should be enforced.

아산시 호소들의 오염실태조사 및 그 대책

장봉기,이종화,박종범,민준호,박종안 순천향대학교 기초과학연구소 1997 순천향자연과학연구 논문집 Vol.3 No.2

The object of this study is to survey water quality of reservoirsin in Asan city. We also suggest some countmeasures for environmental preservation toward sustainable urban development of Asan city. We analyze water qualities (pH, DO, COD, SS, T-P, T-N and Chlorophyll-a) of reservoirs. The level of water quality of small reservoirs is in the range of level Ⅳ-Ⅴ higher than the level Ⅲ established by the Ministry of Environment. Especially, water quality of Sinchang, Youngin and Shinchung reservoirs is worser than that of other reservoirs. Water quality of Asan and Sapkyo lake is the range of level Ⅳ-Ⅴ. As the levels of T-P and T-N are level Ⅳ and level Ⅴ, respectively, eutrophication might be progressed. Reservoirs in Asan city were already serious polluted by inflow of wastewater from residents, animal husbandries and industries. Recently, Metropolitan Area Development Planning(MADP) for Asan bay-area was suggested by the Ministry of Construction. According to this plan, industrialization and urbanization of Asan area will rapidly progress. If sewage and wastewater treatment facilitiesare not provided, water quality of reservoirs in Asan city will be worse. In order to prevent of environment pollution, first, the impact of industrialization and urbanization of Asan area on the environment should be considered at the beginning of MADP. Second, total effluent regulation of water pollution, air pollution and soil wastes, based on the self-purification of the Asan city environment, should be enforced.

행동 유사도 임베딩 기반 실시간 훈련원 행동 인식

이종화(Jong-Whoa Lee),심민호(Min-Ho Sim),최호진(Ho-Jin Choi) 한국정보과학회 2022 한국정보과학회 학술발표논문집 Vol.2022 No.06

다중 실행 불가한 시뮬레이터 기반 지능형 에이전트를 위한 분산 학습 방법

이종화(Jong-Whoa Lee),최호진(Ho-Jin Choi) 한국정보과학회 2021 한국정보과학회 학술발표논문집 Vol.2021 No.6

국방용 임베디드 시스템의 신뢰성 검증을 위한 Fault, Error, Failure 유형 재분류

이학재(Hak-Jae Lee),윤정환(Jung-hwan Yoon),이관영(Kwan-young Lee),이동우(Dong-woo Lee),나종화(Jong-whoa Na) 제어로봇시스템학회 2012 제어로봇시스템학회 합동학술대회 논문집 Vol.2012 No.7

Safety-critical 시스템의 수요 증가와 함께, 시스템 고장을 일으키는 기술적 요인이 많이 발생하고 있다. 이러한 요인으로 인해 Soft Error에 대한 민감도 증가와 같이 칩에 예기치 않은 고장을 일으키는 문제들이 발생하였다. Safety-critical 시스템에서 발생하는 신뢰성 문제들을 검증하기 위해서는 fault, error, 그리고 failure가 시스템에 미치는 영향을 분석을 하는 것이 중요하다. 이러한 영향을 분석하기 위하여 본 논문에서는 임베디드 시스템에서 적용 가능한 결함(fault), 오류(error), 고장(failure) 분류 기법을 제안한다. 이 기법들을 적용하면 시스템 취약도에 대한 정량적 분석이 가능하여 시스템의 신뢰도를 수치화하고 명시적으로 표현할 수 있다. 제안한 분류 기법을 활용하여 시스템에서 발생하는 fault, error, 그리고 failure를 정량적으로 분석할 수 있다. 이 분석 결과를 바탕으로 시스템의 어떤 부분이 fault에 취약한지 확인한다. 그리고 취약구간을 찾아 어떤 요인이 failure rate를 높이는 원인인지 분석하여 시스템 최적화에 기여할 수 있다.

세침흡인을 통한 저에코성 종괴의 소멸

이동석,이종기,김지화 한국유방암학회 2004 한국유방암학회지 Vol.7 No.1

Analysis of Taxifolin Contents under Different Methods of Poria cocos Cultivation

Je Jong LEE,Seung Hun JEON,In Taek PARK,Bo A KIM,An Jin WI,Seok Bong YOO,Whoa Shig PARK,Bong Sup SHIM 한국생물공학회 2015 한국생물공학회 학술대회 Vol.2015 No.10

Perchlotoethylene 을 사용하는 세탁소 작업자들의 직업성 폭로와 건강에 관한 연구

박종안,안선희,이종화 한국산업위생학회 1994 한국산업보건학회지 Vol.4 No.2

In this study we examined several subjective symptoms in an exposed group and an unexposed group to perchloroethylene. The exposed group consists of 30 workers employed in 23 dry-cleaning establishments located in Chung Cheung Do, whereas the unexposed group consists of 42 officers employed in a certain university. This study was conducted from October, 1993 to March, 1994. Also we investigated personal exposure levels and area concentration of PCE, and performed hematological and biochemical examination in blood and urine samples from the exposed group. The results are : 1. The exposed group highly complains several subjective symptoms, particularly in neuropsychiatry, eye, respiratory system and digestive system, compared with the unexposed group. But complaint rates in the exposed group are not related with PCE exposure levels. 2. PCE exposure levels for all dry-cleaning establishment varied widely, from 0.18 to 37.58ppm. The mean exposure level for centers of chain was 16.85ppm, and for local laundries was 8.83ppm, while for self-service establishment it was 3.07ppm. Eighty three percent of the workers were exposed less than the half-level(25.0ppm) of the Korea 50.0ppm standard for eight-hour PCE exposure. Seventeen percent of them exceeded the half-level of the Korea TLV. 3. Statistical correlation exists between the work load(number of operation cycles of equipment and the mass of processed textiles) and the personal exposure levels to be observed. 4. In hematological examination the values of WBC, RBC, Hgb, Hct, MCV, MCH, MCHC and PLT in the exposed group were within normal ranges. In biochemical examination(GOT, GPT, ALP, U-A and LDH) most of the items were within normal ranges. From this surveys conducted on 23 dry-cleaning establishments, the complaint rates of the exposed group to PCE in several subjective symptoms were higher than those of the unexposed group, and PCE exposure levels in all dry-cleaning establishment were below the Korea standard 50.0ppm. In hematological and biochemical examination the significant abnormalities by occupational exposure to PCE were not observed. However, the workers employed in dry-cleaning establishments are always faced with risk, because they are also exposed to several organic solvents used to remove stains. Therefore, various measures to improve occupational environment in dry-cleaning establishment should be considered.