• 한국안전학회지
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• 제21권4호
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• pp.60-65
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• 2006

It is a well known fact that LCD is a central part of the IT industry which is important in the present and the future. But the biggest problem of LCD manufacturing is maintaining a cleaning room environment and administration. Therefore the purpose of this study is to first, prevent the yield depreciation and damage of products, and second, protect the worker ftom accidental electrostatic discharge during LCD manufacture. The soft x-ray ionizer is a type of electrostatic reducer device. It protects against electrostatic discharge in the cleaning room environment and is a necessary environmental factor during LCD production. The positive aspects of the soft x-ray are its shorter time and wider angle of exposure. But the negative aspect of the soft x-ray is its need for several shielding of protection from the harmful x-ray exposure. On this study, the development of the Air Nozzle-type ionizer to amend and refine some problems. For example, examined the electrostatic reduce device of a soft x-ray type and discovered the ion did not go inside well. also workers to be free from danger. An Air Nozzle-type ionizer is comprised of soft x-ray radiation and ionized air production. Air is injected through the nozzle after being ionized from radiation. It supplies air keeping the same pressure into the end foundation of ion production. The soft x-ray is the structure which radiates ionized air through the nozzle (21 holes) having micro holes of the ionizable radiation after ionizing the inside air by the ion production. A worker does not need a cover to protect against x-rays and the Air Nozzle-type ionizer is easy to set up and is more effective at eliminating electrostatic.

• 중소기업융합학회논문지
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• 제2권1호
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• pp.11-18
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• 2012

소프트웨어의 규모가 커지고 복잡해지면서 소프트웨어의 기능적 실패(Functional Failure)를 만들어 내는 위험(Hazard) 요소들을 분석하기가 어려워지고 있다. 안전 필수 시스템(원자력 발전소, 항공관제 시스템, 철도 운영 시스템)에서 이런 기능적 실패는 곧 큰 사고 (인명피해, 환경오염) 로 이어지게 된다. 따라서 이러한 기능적 실패를 방지하고 소프트웨어의 안전성을 높이기 위해서는 소프트웨어 안전성 분석이 필요하다. 하지만 몇 가지 이유 (시간과 노력, 안전성 분석 기법의 다양한 지식 부족, 기관이나 회사의 관습적인 방법 사용) 로 적절하지 못한 안전성 분석 기법을 선택하게 되는 경우가 있다. 따라서 본 논문에서는 기존 안전성 분석 기법과 최신 안전성 분석 기법, 통합 모델 몇 가지를 소개 하겠다. 이것을 통해 전문가는 여러 종류의 안전성 기법을 간략하게 확인 할 수 있을 것이고, 시스템에 맞는 안전성 분석 기법을 선택하는데 도움을 받을 수 있을 것이다.

• 대한용접접합학회:학술대회논문집
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• 대한용접접합학회 2002년도 Proceedings of the International Welding/Joining Conference-Korea
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• pp.675-680
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• 2002

Cracking and bulging in welded and internally lined pressure vessels that work in thermal-mechanical cycling service have been well known problems in the petrochemical, power and nuclear industries. However, published literature and industry surveys show that similar problems have been occurring during the last 50 years. A better understanding of the causes of cracking and bulging causes is needed to improve the reliability of these pressure vessels. This study attempts to add information required for increasing the knowledge and fundamental understanding required. Typical examples of this problem are the coke drums in the delayed coking units refinery process. This case was selected for experimental work, field study and results comparison. Delayed coking units are among the refinery units that have higher economical yields. To shut down these units represents a high negative economical impact in refinery operations. Also, the maintenance costs associated with repairs are commonly very high. Cracking and bulging occurrences in the coke drums, most often at the weld areas, characterize the history of the operation of delayed coking units. To design and operate more robust coke drums with fewer problems, an improved metallurgical understanding of the cracking and bulging mechanisms is required. A methodology that is based field experience revision and metallurgical analyses for the screening of the most important variables, and subsequent finite element analyses to verify hypotheses and to rank the variables according to their impact on the coke drum lives has been developed. This indicated approach provides useful information for increasing coke drum reliability. The results of this work not only order the most important variables according to their impact in the life of the vessels, but also permit estimation of the life spans of coke drums. In conclusion, the current work shows that coke drums may fail as a combination of thermal fatigue and other degradation mechanisms such as: corrosion at high and low temperatures, detrimental metallurgical transformations and plastic deformation. It was also found that FEA is a very valuable tool for understanding cracking and bulging mechanisms in these services and for ranking the design, fabrication, operation and maintenance variables that affect coke drum reliability.

• 디지털콘텐츠학회 논문지
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• 제18권7호
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• pp.1293-1301
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• 2017

최근 핵가족화, 개인화 등과 같은 사회구조 변화로 개인 및 사회적 문제가 대두되고 있으며, 부정적 감정 증폭으로 인해 다양한 문제의 원인이 되기도 한다. 과거에 심리적 안정감을 주는 가족 구성원의 부재는 현대인의 감정적 어려움의 대표적인 원인으로 꼽을 수 있다. 이러한 개인 및 사회적 문제를 일상생활에서 사용자와 교감하는 컴패니언 로봇의 공감 인터랙션을 통해 해결하고자 한다. 본 연구에서는 감성 로봇 프로토타입 제작을 통해 정교한 공감 인터랙션 디자인을 하였으며, 실험을 통해 연구를 진행하였다. 그 결과로 감성 로봇의 공감 인터랙션에 얼굴 인터랙션이 크게 영향을 미치며, 부정 감성에서 인터랙션이 로봇의 공감도를 높이는 것을 확인할 수 있었다. 결과적으로 본 연구는 감성 로봇을 제작하여 더욱 정교한 인터랙션을 구현하였다는 점과, 실험 결과를 바탕으로 로봇의 공감 인터랙션 디자인 가이드라인을 제시하였다는 점에서 이론적 및 실용적 의의가 있다.

• 한국농촌건축학회논문집
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• 제12권3호
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• pp.57-65
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• 2010

The graying of population is not only a significant problem in developing countries, but also in a small country which is passing industrialization and urbanization. Industrialization and urbanization has raised a number of nuclear family. Moreover, changes in the environment and development in science such as a medical development and improving standard of health and hygiene have raised an average life expectancy. Considering these factors, average age of population is going up continue. Developed countries such as Europe, US and Japan have already experienced the graying and some countries have entered aged society. Korea is expected to be reached post-aged society in 7 years which is faster than developed countries that started aging society earlier than Korea. The purpose of this study is a analysis of resident's opinions and preference and using space of elders facilities and seeking a plan to construct the facilities through suggesting standard of use space. Firstly, this report will classify current situation of spacial organization on elder facilities focusing on major sectors and will compare in size. Moreover, standard of area distribution through an analyzing characteristics of each spacial organization. Secondly, The report will compare and analyze between space and main traffic line through classifying traffic lines between staffs and residents of elder facilities and understanding characteristics and problems of each traffic line. Lastly, this will study perception and preference on staffs at elders facilities and middle old aged people who are potential demander, and compare between these people.

• 한국치위생학회지
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• 제7권1호
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• pp.1-13
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• 2007

In Korea, respect for the aged and filial devotion is treated as basic ethics for human life, and family takes care of the aged person mainly. Nowadays, family support on the aged person is prioritized than the others. However, number of aged person is growing, and family, which is used to protect the aged, becomes nuclear through industrialization. In addition, social advancement of female induces weakened supporting function of family, and all these issues generate the problem of protection for the aged as significant social problems. Author conducted oral inspection and questionnaire for the aged in some welfare facilities in Gyeongnam location from December 2005 to February 2006 to improve quality of life and oral hygiene of the aged. Through gathered data, the actual condition of oral hygiene management on the aged person in welfare facility was evaluated as fundamental data for project development on oral hygiene of aged person. Through the analysis of inspected data, the following conclusions are derived. 1. Management status of oral hygiene is mostly not good, and toothbrushing per day is 'one time' for the most cases. 2. In free-of-charge facility, monthly allowance is 'under 50 thousand won' for the most cases. 3. Time for visiting oral treatment facility is on 'when toothache is occurred' for the most cases. For treatment content, 'prosthetic dentistry' takes 36.8% in charged facility, and 'tooth extraction' is 27.0% for free-of-charge facility. 4. Average DMFT index of the aged in charged facility is 16.81, and free-of-charge facility is 21.71. 5. Average number of functional teeth in charged facility is 15.22, and free-of-charge facility shows 7.29. 6. Average number of remained teeth in charged facility is 15.71, and the umbe in free-of-charge facility is 9.04. 7. Average number of extractable teeth in charged facility is 0.48, and for free-of-charge facility, the number goes up to 1.70.

• 셀메드
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• 제10권3호
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• pp.25.1-25.7
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• 2020

Allergic Rhinitis (AR) is an IgE (immunoglobin-E) mediated inflammatory condition of upper respiratory tract; main clinical features involve runny nose, sneezing, nasal obstruction, itching and watery eyes. AR is a global problem and has large variations in incidences, currently affects up to 20% - 40% of the population worldwide. It may not be a life-threatening disease per se but indisposition from the condition can be severe and has the potential to adversely affect the daily functioning of life. Classical yoga literature indicates that, components of yoga have been used to treat numerous inflammatory conditions including upper respiratory tract. A few yoga intervention studies reported improvement in lung capacity, Nasal air flow and symptoms of allergic rhinitis. This review examined various anti-inflammatory pathways mediated through Yoga that include downregulation of pro-inflammatory cytokines and upregulation of anti-inflammatory cytokines. The hypothalaminic-pitutary-adrenal (HPA) axis and vagal efferent stimulation has been reported to mediate anti-inflammatory effect. A significant reduction is also reported in other inflammatory biomarkers like- TNF-alpha, nuclear factor kappa B (NF-κB), plasma CRP and Cortisol level. Neti, a yogic nasal cleansing technique, reported beneficial effect on AR by direct physical cleansing of thick mucus, allergens, and inflammatory mediator from nasal mucosa resulting in improved ciliary beat frequency. We do not find any study showing effect of yoga on neurogenic inflammation. In summary, Integrated Yoga Therapy may have beneficial effect in reducing symptoms and improving quality of life for patients with allergic rhinitis. Yoga may reduce inflammation through mediating neuro-endocrino-immunological network. Future studies are needed to explore the mechanism how yoga might modulate immune inflammation cascade and neurogenic inflammation at the cellular level in relevance to allergic rhinitis; the effects of kriyas (yogic cleansing techniques) also need to be evaluated in early and late phase of AR. So the proposed model could guide future research.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 춘계학술대회논문집A
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• pp.636-643
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• 2001

Interference between the crossover leg of the reactor coolant system (RCS) and the pipe whip restraints (PWR) has brought a degradation issue of the integrity of the Reactor Coolant System in Westinghouse type nuclear power plants (NPPs) of Korea. According to the gap Inspect ion carried out during planned overhaul (Year 2000), interference between the crossover leg and the PWR was found in each RCS loop. This plant has had the high vibration problem on the RC pump 'B'. The reason for the high vibration in the RC pump 'B' had been massively surveyed and it was found that the crossover leg of RCS contacted with the PWR in hot condition. Since the contact between the crossover leg and the PWR changes the dynamic characteristics of the piping system for the RCS, this is considered as one reason for the high vibration. And a possibility of overstress on the crossover leg due to the contact with the PWR should be evaluated. Through performing RCS integrity analyses, subsequent actions were initiated to increase the gap between those parts. As the results of the appropriate separation between two parts, it was reported that there was no unusual noise or vibration during plant heat-up. In this paper, the evaluations for the gap between the crossover leg and the PWR and the structural integrity due to loop binding is described.

• 자원ㆍ환경경제연구
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• 제21권2호
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• pp.271-299
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• 2012

환경과 경제성장과의 관계는 환경경제학 분야에서 오랜 동안 논란이 되어왔으며, 논란의 핵심은 두 변수간의 내생성(endogeneity)과 생략변수(omitted variables)들에 관한 문제들이다. 본 연구는 논란의 핵심들을 고려하여 우리나라의 1981년~2008년까지의 시계열자료를 바탕으로 $CO_2$ 배출량과 경제성장 간의 인과관계 및 에너지믹스의 영향을 실증적으로 분석하였다. 에너지믹스와 계량경제학 문제들을 고려한 대부분의 모형에서 $CO_2$ 배출량과 경제성장의 관계가 역 U자형이라는 EKC 가설을 확인할 수 있었으며, 에너지믹스가 국내 온실가스 감축에 크게 기여하는 것으로 나타났다. 에너지믹스가 $CO_2$ 배출에 미치는 영향은 원자력에너지가 다른 에너지원에 비해 $CO_2$ 배출량 감축에 가장 큰 기여를 하였으나, 신재생에너지는 $CO_2$ 감축에 거의 기여하지 못한 것으로 분석되었다. 이는 지금까지 국내에서 신재생에너지 비중이 다른 에너지원에 비해 적었기 때문이다. 또한 최종 에너지 소비부문은 $CO_2$ 증가와 수송부문의 연관성이 통계적으로 유의한 것으로 나타났다.

• 한국재난정보학회 논문집
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• 제11권1호
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• pp.97-106
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• 2015

현재 한국은 북한이 보유한 재래식무기, 핵무기, 화생방무기 등의 다양한 공격에 노출되어 있다. 이러한 공격들에 의해 국민들에게 발생 될 피해는 추정만 가능하고 정확한 예측이 어려운 상황이다. 이러한 북한의 군사위협에 정부지원 대피시설은 대상, 설치범위, 예산, 표준도면 등을 종합적으로 고려하여 일괄적으로 사업이 진행되나, 공공용 대피시설의 경우는 특별한 규정이나 원칙 등이 없이 다양한 시설을 대상으로 지정하기 때문에 군사위협에 대한 방호는 전혀 기대할 수가 없는 상황이다. 이에 본 연구에서는 북한의 군사위협에 대하여 파악하여 공공용 대피시설의 계획 및 설계에 대한 문제점을 도출하였으며 연구를 통해 얻은 결과 및 제안사항을 제시하고 있다.