• 공업화학
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• 제32권4호
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• pp.423-430
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• 2021

본 연구는 건자재용 목재의 화재위험성 및 화재위험성 등급을 평가하기 위하여 Chung's equations-III, -IV에 의한 화재성능지수-III (FPI-III), 화재성장지수-III (FGI-III), 화재위험성지수-IV (FRI-IV)를 중심으로 조사하였다. 시험편은 적삼목, 전나무, 물푸레나무, 단풍나무를 사용하였다. 화재 특성은 시험편에 대하여 콘칼로리미터(ISO 5660-1) 장비를 이용하여 조사하였다. 연소반응 후 측정된 FPI-III는 polymethylmetacrylate (PMMA) 기준으로 0.86~12.77로 나타났다. FGI-III는 PMMA를 기준으로 0.63~5.26으로 나타났다. 화재위험성 등급 지수인 FRI-IV에 의한 화재 등급은 0.05~6.12였으며 적삼목이 단풍나무와 비교하여 122.4배 높았다. FRI-IV에 의한 화재위험성 등급은 단풍나무, 물푸레나무, 전나무, PMMA, 적삼목 순서로 증가하였다. 모든 시편의 CO 피크농도는 103~162 ppm으로 측정되었으며 미국직업안전위생관리국(occupational safety and health administration)의 허용기준(permissible exposure limits)인 50 ppm보다 2.1~3.2배 높게 나타났다. 적삼목과 같이 체적밀도가 작고 휘발성 유기물질을 다량 함유한 소재는 FPI-III가 낮고 FGI-III가 높으므로 화재위험성 등급이 높은 것으로 나타났다.

• 농약과학회지
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• 제16권4호
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• pp.308-314
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• 2012

국내 유통 중인 친환경농산물 중 과채류와 과실류의 잔류농약 모니터링을 통해 친환경인증 농산물의 잔류농약 실태조사 및 안전성을 평가하기 위하여 서울을 포함한 전국 8개 도시 9개 지점의 대형마트와 친환경농산물 전문판매점에서 25종의 과채류와 과실류를 555점 채취한 후 acetamiprid를 포함한 245종 농약을 대상으로 GC-ECD/NPD와 HPLC-DAD/FLD를 이용한 다성분동시분석법으로 잔류농약을 분석하였으며, 분석결과 농약으로 추정되는 peak는 GC-MSD를 이용하여 재확인하였다. 잔류농약 분석결과 555점의 시료 중 사과를 포함한 4점의 시료에서 bifenthrin, EPN 및 chlorpyrifos가 검출되었으며, 검출율은 0.72%이었다. 농약이 검출된 4점의 시료 중 잔류량은 모두 잔류허용기준(maximum residue limit, MRL) 이내였으나 EPN이 검출된 배는 잔류량이 허용수준인 MRL의 1/20을 초과하였다. 일일최대섭취허용량(maximum permissible intake, MPI) 대비 일일섭취추정량(estimated daily intake, EDI)은 0.76% 미만이었다.

• 의료법학
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• 제11권2호
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• pp.337-361
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• 2010

In the case of Korea, both of modern medicine and oriental medicine are admitted as medical practices in the system. In other words, healthcare system is dualized. However, medical practice that corresponds to oriental medicine in Korea is substitution of medical practice in cases of foreign countries. For use of medical devices, it is provided only for doctors and medical technician relevant to use. Particularly, although oriental medicine is recognized as orthodox medicine in terms of the features of Korean medical system, superintendency of oriental doctors is not identical with that of doctors for use of medical devices and superintendency toward medical technicians. Recently, Cheongju District Court decided that superintendency of oriental doctor upon physical therapist is not acknowledged. It can be said that the judgement is opposed to the original verdict which judged that oriental doctors' employment and guidance of oriental doctors upon physical therapist is permissible. Hence this study aimed to review on domestic medical law system, which is dualized, roles of medical professionals, intent of the medical license system, provisions related to medical technician law and relevant precedents. Regulations on practices other than licensed practices by medical professionals are made because medical practices may affect on danger toward life and body of human and public health also. Therefore, the nation regulates medical professionals having licenses to perform medical practices within the range of the licenses. It is clearly prescribed that medical technicians may perform medical practices under instructions of doctors or dentists pursuant to the medical technician law. In addition, the court also judges that it is out of the license of oriental doctors if they use CT devices and limits the use of modern medical devices by oriental doctors. That is to say that it limits oriental doctors' employment of medical technicians and pursuant of oriental doctors on medical technicians as well.

• Safety and Health at Work
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• 제10권3호
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• pp.355-361
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• 2019

Background: Painters in the automotive sector are routinely exposed to volatile organic solvents, and the levels vary depending on the occupational health and safety controls enforced at the companies. This study investigates the levels of exposure to organic vapors and the existence of controls in the formal economy sector in southern Colombia. Methods: This is an exploratory study of an observational and descriptive character. An analysis of solvents is conducted via the personal sampling of painters and the analysis of samples using the National Institute for Occupational Safety and Health 1501 method. The amount of solvents analyzed varied according to the budget allocated by the companies. The person in charge of the occupational safety and health management system was interviewed to learn about the exposure controls implemented at the companies. Results: A medium exposure risk for toluene was found in one company. Another presented medium risk for carbon tetrachloride, xylene, ethylbenzene, and n-butanol. The others showed low risk of exposure and that the controls implemented were not sufficient or efficient. Conclusion: These results shed light on the working conditions of these tradespeople. The permissible limits established by Colombian regulations for the evaluated chemical contaminants were not exceeded. However, there were contaminants that exceeded the limits of action. The analysis of findings made it possible to propose improvements in occupational safety and health management systems to allow the optimization of working conditions for painters, prevent the occurrence of occupational diseases, and reduce costs to the country's health system.

• Journal of Electrical Engineering and Technology
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• 제4권3호
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• pp.353-359
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• 2009

This paper proposes a novel technique for calculating the security costs that properly includes ramping constraints in the operation of a deregulated power system. The ramping process is modeled by a piecewise linear function with certain assumptions. During this process, a ramping cost is incurred if the permissible limits are exceeded. The optimal production costs of the power producers are calculated with the ramping cost included, considering a time horizon with N-1 contingency cases using contingency constrained optimal power flow (CCOPF), which is solved by the primal-dual interior point method (PDIPM). A contingency analysis is also performed taking into account the severity index of transmission line outages and its sensitivity analysis. The results from an illustrative case study based on the IEEE 30-bus system are analyzed. One attractive feature of the proposed approach is that an optimal solution is more realistic than the conventional approach because it satisfies physical constraints, such as the ramping constraint.

• 한국지역사회생활과학회지
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• 제18권1호
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• pp.87-95
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• 2007

This study was to determine the effect of cooling parts of the limbs without harm to health. The results provide basic data for the development of clothing which could increase work efficiency and reduce body strain in hot environments. Five male adults took part in the study, conducted in a climate chamber with an ambient temperature of $37^{\circ}C$ and a relative humidity of 50%. The limbs were divided into six areas to be cooled: upper arm, forearm, thigh, calf, hand, and foot. According to preceding studies, permissible cooling safety limits of skin temperature for each part of the body for one-hour were $20^{\circ}C$ on the upper arm, forearm, thigh, and calf, and $23^{\circ}C$ on the hand and foot. For this reason, cooling the skin of each region was carried out at the above mentioned temperatures. In conclusion, cooling the hand and foot reduced perspiration, rectal temperature and heart rate. Therefore, the heat stress of workers exposed to hot environments would be reduced by decreased subjective sensations of heat and increased comfort. The effectiveness of cooling was better on the arm than on the leg.

• Natural Product Sciences
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• 제8권3호
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• pp.83-89
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• 2002

Butea monosperma Kuntze, commonly known as 'Palash', is employed in various indigenous systems of medicine against several diseases and almost every part of the plant has diversified medicinal properties. The seeds are used as anthelmintic, aperient, digesti and to treat piles, skin diseases and abdominal troubles. They also have the property of reducing 'Kapha' and 'Vata' (in Ayurveda). In the present paper a detailed pharmacognostical evaluation of seeds has been undertaken. The study includes macro- and micro-scopical details, fluorescence powder study and HPTLC fingerprinting. The seed is characterized by finely ridged seed coat and palisade-like malpighian cells, discontinuous transparent linea lucida in upper half of malpighian layer and simple & oblong hilum. The study also concludes that the seed samples procured from different places have similar morphological and physico-chemical characteristics. These observations are also supported by similar TLC profiles. The estimation of heavy metals (to detect permissible toxic limits), and fatty acid composition have been carried out. An attempt has also been made to see the ecological and edaphic variations, if any.

• 한국식품위생안전성학회지
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• 제19권3호
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• pp.140-150
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• 2004

It has been recognized that international food standards should be considered for a long time. The Codex Alimentarius programme initiated in the early 1960s has received valuable background documentation from the ICMSF (International Commission on Microbiological Specification for Foods) and also from ISO(the International Organization for Standardization). There has been a considerable move towards international harmonization of standards and methods of analysis. Many foreign countries recommend the guidelines for food microbiological standards quantitatively. To complement microbiological limits and tolerance levels for permissible number of defective samples, allowances should be made for sampling and other variations in laboratory methods. It may be necessary for guidelines of domestic food microbiological standards to be established so that the domestic food standards can be harmonized with foreign food standards. Food safety related microbiological guidelines of ICMSF, EU (European Union), UK (United Kingdom), China (Hong Kong) and Japan were reviewed and shown in examples.

• 한국수자원학회논문집
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• 제36권5호
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• pp.811-821
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• 2003

본 연구에서는 수리모형실험을 실시하여 방류관의 흐름특성을 분석 방류관 설계의 적정성을 검토하는데 있다. 수리모형실험 결과 기본계획의 방류관 통수능은 과소설계 되었고, 이를 토대로 설계 변경한 기본설계의 방류관 통수능 설계치는 실험치와 거의 일치하여 적절하게 설계되었음을 알 수 있었다. 또한 방류관 부압발생 여부 및 종단형상의 적정성을 검토한 결과 허용치 이내 값이 발생되어 적절한 것으로 판명되었다. 이러한 과정을 토대로 기본설계의 방류관 규모 및 위치가 적절하였음이 검토되었다.

• 국제초고층학회논문집
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• 제5권3호
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• pp.167-176
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• 2016

This paper describes a large tuned mass damper (TMD) developed as an effective seismic control device for an existing highrise building. To realize this system, two challenges needed to be overcome. One was how to support a huge mass that has to move in any direction, and the second was how to control mass displacement that reaches up to two meters. A simple pendulum mechanism with strong wires was adopted to solve the first problem. As a solution to the important latter problem, we developed a high-function oil damper with a unique hydraulic circuit. When the mass velocity reaches a certain value, which was predetermined by considering the permissible displacement, the damper automatically and drastically increases its damping coefficient and limits the mass velocity. This velocity limit function can effectively and stably control the mass displacement without any external power. This paper first examines the requirements of the TMD using a simple model and clarifies the constitution of the actual TMD system. Then the seismic upgrading project of an existing high-rise building is outlined, and the developed TMD system and the results of performance tests are described. Finally, control effects for design earthquakes are demonstrated through response analyses and construction progress is introduced.