• 한국가스학회지
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• 제15권6호
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• pp.20-27
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• 2011

PSM 제도와 더불어 사고 피해크기 예측기법은 국내 석유화학공장에 많이 보급되어 활용되고 있으나, 사고로 인한 영향, 즉, 작업자, 조업중단, 유틸리티에 미치는 영향을 고려하지 않고, 비상조치계획을 수립하고 있어서 다소 현실적이지 못한 문제점이 있다. 따라서 본 연구에서는 현실적인 비상조치계획을 수립하고, 위험기반 안전관리를 수행할 수 있도록 하기 위하여 석유화학공장의 설비에서 사고로 인한 피해지역과 재정적 손실을 산출하여 사고 피해크기를 비교 분석하였다. 피해지역을 기준으로 하는 경우에는 장치손상지역, 상해지역 그리고 독성지역을 동시에 고려한 안전지역을 기준으로 피해크기 등급을 산출하여야 하고, 또한 공정의 특성 및 주변 환경을 고려하면 피해지역을 기준으로 하는 것보다 재정적 손실을 기준으로 하는 것이 현실적인 사고 피해크기 산출방법이었다.

• 수산해양교육연구
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• 제29권3호
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• pp.746-756
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• 2017

Marine accidents of fishing vessels occupied about 70.5% of the whole marine accidents in Korea from 1996 to 2015, this ratio was not much changed for a long time. A lot of efforts have been taken recently but marine accidents do not reduce. Therefore a fundamental counterplan to decrease accidents in fishing vessel is indispensable for reduction of whole marine accidents in Korea. Since the most frequent occurring accidents in fishing vessels were engine trouble and collision in statistics by KMST (1996~2015), the study focused on them. The cause of engine trouble were poor inspection and maintenance of the mechanical system. The greatest portion of marine accidents was collision, and the biggest cause of the collision was poor watch-keeping. The better watch-keeping will be the best way to reduce the accident. For this reason, it may be necessary for the navigator to make strict precaution on the other vessels under way systematically and keep the regulation for preventing collisions, and for an engineer on watch to make a check the mechanical system periodically for reduction the engine trouble. Instead of penalty, incentive about safe navigation will be helpful for reduce accident as if automobile insurance would do. In order to prevent engine trouble, the fisheries federation establish the repair center. Futhermore the development of autonomous navigation system is necessary to reduce the marine accident.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.92-94
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• 2003

The autotransformer currently used on the electric railway system is made of class A insulation material and uses the paper insulation method. As a power converter supplying power to the trolley wire, the autotransformer is one of critical equipment in the railway system. In the autotransformer, load irregularly changes and overload often occurs. These cause overheating of the autotransformer and facilitate deterioration of the autotransformer resulting in burnout accidents due to insulation breakdown. Also, the current autotransformer has poor insolation and short-circuit strength which often badly affect the service life of the transformer, and needs to improve its quality urgently. To overcome one of existing shortcomings of the mold transformer, manufacturers use epoxy resins that have superior flame retardancy to get rid of fro and explosion possibilities during accidents. Currently, new mold transformers are used in indoor distribution facilities with fire-fighting equipments. Coils molded in epoxy resins do not have their insulation performance compromised by humidity, dust, etc enabling easy inspection and maintenance. Comparing to the oil immersed transformer, the mold transformer does not have any concern about environmental pollutions by oil leak or replacement Therefore, to reduce breakdowns and improve reliability of the autotransformer, it is necessary to develop a new mold autotransformer with low loss suitable for our environment to suppress breakdowns of the autotransformer and improve the reliability. This study is about development of a low-loss mold autotransformer necessitated by reasons mentioned earlier.

• 한국가스학회지
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• 제15권5호
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• pp.7-12
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• 2011

액화석유가스 자동차는 대도시의 대기환경 개선을 위해 적용되고 있으며 대기 오염물질을 저감시키는데 효과적인 것으로 입증되고 있다. 이러한 가스충전소에서 운용하는 저장탱크는 인간의 생명과 재산에 손실을 유발하는 원인으로 안전성이 요구된다. 지상저장탱크는 외부화염에 의하여 폭발의 위험성이 있으며, 지하매몰 저장탱크는 부식에 의한 피해를 유발시킬 수 있으며 검사하는데 어려움이 있다. 이 연구에서는 RPS-TRIZ 기법을 활용하여 저장탱크의 안전성과 검사편리성에 유용한 지하격납 저장탱크를 제안하였다.

• 한국안전학회지
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• 제32권4호
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• pp.129-136
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• 2017

This study investigated the probability of possible accident through qualitative and quantitative analysis of the pressure safety valve types installed in facilities using high pressure gas to compare the installation domestic and foreign pressure safety valve standards sought the safety characteristics and safety improvement direction accordingly. The three types are the case where the shut-off valve is not installed at the front of the PSV (Case A), If a shut-off valve is installed at the front of the PSV for inspection (Case B) and If a shut-off valve is installed in front of PSV (C.S.O), PSV is installed in parallel (Case C). Three types of cases were compared with FTA and HAZOP. The results of study of the possible accidents due to over-pressure safety valve installation type, used in a high-pressure gas facilities was shows in the following order Case B > Case A > Case C. The results of analysis through FTA was in order to protect the reservoir for the possible occurring of accident the safety valve installation is depend on its type. In the FTA analysis, defects in the device itself which attached to the storage tank as a substitute for analysis of the probability of operator mistakes was Case B with as high as $2.01{\times}10^{-6}$. Depending on the type of installation analysis of Case B in order to ensure safety is prohibited to install shut-off valve and believes that mandatory regulations are needed. Rationally installing of pressure safety valve in the high pressure using facilities will be expected to improve the industrial safety from severe accidents such as high-pressure gas fire explosion.

• 농촌계획
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• 제21권2호
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• pp.163-175
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• 2015

This study aimed to analyze factors of importance and performance picked by customers of Bibijeong, a farm restaurant operated by the local community of Wanju-gun. Major points include: Recognition paths mostly were word of mouth and mass media, types of visit were in the company of friends, family members or work colleagues, and purposes of visit included consumption of meal and identifying features of the restaurant. Secondly, factor analysis showed that level of facility, atmosphere/cleanness, diversity of menu, employees, ingredients and network. The Cronbach Alpha coefficient was +0.6. Thirdly, average of importance of factors was 3.861 while average performance was 3.429. IPA analysis showed that employee(communication, customer contact) in the first quadrant proved the need for fast improvement through training. Atmosphere/cleanness (interior atmosphere, table clean, kitchen cleanliness, clean dishes, interion design) and employee(proficiency, menu recognition), foodstuff(freshness, origin, safety) in the second quadrant showed that the marketing strategy of improvement as well as maintaining current status is needed, including regular training and hygiene inspection. The third quadrant contains facilities(disability, baby, fire protection) and food menu(food packing, various menu, creative menu, menu description), network(village economic links), which showed the need for gradual improvement. The forth quadrant contains network(sights's near contains. The results so far can be summed into the statement that overcoming the basic functionality of providing meals and linking the restaurant with local attractions and local economy would be need, as well as building up the image of unique farm restaurant with local features, so that Bibijeong can serve as the centerpiece of community and foundation of exchange with other areas.

• Corrosion Science and Technology
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• 제14권1호
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• pp.12-18
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• 2015

Since the operation period of nuclear power plants has increased, the degradation of buried pipes gradually increases and recently it seems to be one of the emerging issues. Maintenance on buried pipes needs high quality of management system because outer surface of buried pipe contacts the various soils but inner surface reacts with various electrolytes of fluid. In the USA, USNRC and EPRI have tried to manage the degradation of buried pipes. However, there is little knowledge about the inspection procedure, test and manage program in the domestic nuclear power plants. This paper focuses on the development and build-up of real-time monitoring and control system of buried pipes. Pipes to be tested are tape-coated carbon steel pipe for primary component cooling water system, asphalt-coated cast iron pipe for fire protection system, and pre-stressed concrete cylinder pipe for sea water cooling system. A control system for cathodic protection was installed on each test pipe which has been monitored and controlled. For the calculation of protection range and optimization, computer simulation was performed using COMSOL Multiphysics (Altsoft co.).

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2006년도 춘계 학술발표회 논문집
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• pp.1100-1109
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• 2006

In this study, two different technologies which can measure temperature simultaneously at many points are introduced. One is to use a thermal sensor cable that is comprised of addressable thermal sensors connected in parallel within a single cable. The other is to use an optic fiber with Distributed Temperature Sensing (DTS) system. The difference between two technologies can be summarized as follows. A thermal sensor cable has a concept of 'point sensing' that can measure temperature at accurate position of a thermal sensor. So the accuracy and resolution of temperature measurement are up to the ability of the thermal sensor. Whereas optic fiber sensor has a concept of 'distributed sensing' because temperature is measured by ratio of Stokes and anti-Stokes component intensities of Raman backscatter that is generated when laser pulse travels along an optic fiber. It's resolution is determined by measuring distance, measuring time and spatial resolution. The purpose of this study is that application targets of two temperature measurement techniques are checked in technical and economical phases by examining the strength and weakness of them. Considering the functions and characteristics of two techniques, the thermal sensor cable will be suitable to apply to the assessment of groundwater flow, geothermal distribution and grouting efficiency within 300m distance. It is expected that the optic fiber sensor can be widely utilized at various fields (for example: pipe line inspection, tunnel fire detection, power line monitoring etc.) which need an information of temperature distribution over relatively long distance.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2004년도 제5회 정기학술발표대회 논문집
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• pp.20-25
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• 2004

2003년 7월 18일 인칠공항공사는 동북아의 중추공항(Hub-Airport)건설을 목표로 단계적으로 추진되는 인천국제공항 2단계건석사업에 필요한 전문적인 사업관리 기술을 지원 받기 위하여 KIDS 컨소시엄(건원, ITM, 도화, 공간으로 구성된 컨소시엄)과 2단계 건설사업관리 기술지원용역계약을 체결하였다. 2단계 건설사업은 250만 평의 부지조성, 제3활주로, 계류장,원격탑승동, 무인자동열차, 고속수하물처리시설, 화물터미널. 등과 필요한 시설물을 2008년 말까지 완료하는 것으로 계획되어 있으며 CM계약자는 기 구축된 공항공사의 각종 사업관리 Tool을 이용하여 공정관리를 포함한 종합사업관리, 건축/전럭시설의 설계감리. IAT/BHS 등의 설계관리. 품질 및 시운전관리 등의 업무에 국내외 전문인력을 공항공사의 사업관리 조직에 투입하여 공사직원들과 함께 사업목표 달성을 위해 매진하고 있다. 본 고에서는 인천공항공사에서 수행하고 있는 건설사업관리사례를 주요업무 중심으로 소개해 보고자 한다.

• 한방안이비인후피부과학회지
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• 제20권3호
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• pp.118-126
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• 2007

Tongue diagnosis is a profound and special part of the whole Oriental Medicine. We examined the method, the principle and the meaning of tongue diagnosis according to a literature cited, considered a meaning of tongue diagnosis. As a result, we come to a conclusion like that. 1. Tongue is related with internal organs by meridian system, especially has a direct connection with heart and spleen. 2. The heart, a master of internal organs, has its specific opening in the tongue. The spleen, source of nutrients for growth and development, has its specific body opening in the mouth. So tongue reflects states of internal organs, Qi, blood, the constructive energy and the defensive energy. 3. When doing tongue diagnosis, we must pay attention to the position and the order of inspection of the tongue. We must diagnose by referring to a ray of light, diet, season, age, physical constitution, habit and taste, can make a accurate diagnosis. 4. We can classify constitutions, distinguish syndromes, suppose prognosis, make a prescription by using tongue diagnosis. 5. Reddened tip of the tongue represents flaring-up of the heart fire, and it means psychologic stress. Dental identations on the tongue edges represents deficiency of Qi of the spleen, and it means physiologic fatigue. 6. Through observing humidity of fur of the tongue, we can guess psychologic stress and physiologic fatigue. Through observing thickness of fur of the tongue, we can guess function of spleen and stomach.