• 한국대기환경학회지
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• 제20권3호
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• pp.361-369
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• 2004

A metal fiber bed has seldom been applied to the practical filtration process despite its excellent mechanical and chemical stability. The filter-bed used in this work was highly porous with open structure, of which apparent porosity was 80 ∼ 90%. Although pressure loss across the filter-bed was very low, separation efficiency was found to be quite high. This paper focuses on the basic filtration mechanisms of a metal filter-bed and a thin ceramic filter from fly ash for reference. The experimental parameters were face velocity, dust loading and porosity of filter-bed. Pressure drop increased with increasing face velocity and dust feeding load for both filters. It also showed that dust particles deposited in the deep flow path, finally resulting in clogging the pore channels. It thereby indicates that the dominating mechanism of the metal filter-bed would be depth filtration. Meanwhile, the thin fly ash composite filters trapped the aerated dust mainly on the surface of the filter medium, so that the instantaneously formed dust layer might cause a steep increase of pressure drop across the filtration system.

• 한국윤활학회:학술대회논문집
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• 한국윤활학회 2003년도 학술대회지
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• pp.388-394
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• 2003

This paper deals with a premature failure mechanism of deep grooved ball bearing for automobiles. A close examination of used bearings revealed that the premature failure could be arose by dents on the ball. Universal testing machine with specially designed tools is used to simulate the practical dents on the ball and test bearings are assembled with dented balls and new hearing components. The endurance test results showed that the dents on the balls were printed on the races and these phenomena come to premature failure.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 E
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• pp.1644-1646
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• 1998

High-Smokestacks have been the symbol of the thermal power plant. Those cause the thermal power plant to be damaged by lightening for reaching several hundreds meter. In this paper, we investigated the accident of low-voltage source circuit due to grounding potential rise by lightening via high-smokestack in practically driving power plant, described examination into the cause and the impulse analysis. We analysed the transient voltage by EMTP(ElectroMagnetic Transient Program) via modeling the grounding system of power plant. This theoretical results coincided with practical accidental state. Therefore, it was verified that we could apply the grounding system of power plant and substation with the distribution-circuit analysis(EMTP).

• 대한안전경영과학회지
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• 제2권3호
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• pp.185-195
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• 2000

Increased complexity of products and their manufacturing processing demans higher quality control and monitoring than ever before. Therefore, flexible automatization or flexible manufacturing systems (FMS) offer numerous advantages over alternative manufacturing methods. In this state, a in-process monitoring is one of the important flexible automatino system. And as use of NC and CNC machine tool has been increasing, cutting work has automating and it is necessary to develop the automatic production system combined a couple of machine tool. Thus, in this paper to search examination it can measure the tool wear and the tool life and can be more practical research subject.

• Clinical and Experimental Pediatrics
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• 제53권9호
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• pp.824-829
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• 2010

The safety and effectiveness of colonoscopy in the investigation of lower gastrointestinal tract pathology in children has been established for more than 2 decades in Korea. The skill and experience have since advanced to the point that both diagnostic and therapeutic colonoscopy are now routinely performed by most pediatric gastroenterologists. Pediatric colonoscopy differs significantly from its adult parallels in nearly every aspect including patient and parent management and preparation, selection criteria for sedation and general anesthetic, bowel preparation, expected diagnoses, instrument selection, imperative for terminal ileal intubation, and requirement for biopsies from macroscopically normal mucosa. Investigation of inflammatory bowel disease, whether for diagnosis or follow-up evaluation, and suspected colonic polyps are the most common indication for pediatric colonoscopy. The child who presents with signs and symptoms of lower gastrointestinal disorder should undergo colonoscopy with biopsy to make the diagnosis, as well as to help determine the appropriate therapy. This review introduces practical information on pediatric colonoscopy, the author's experiences, and the role of colonoscopic examination in the diagnosis and treatment of pediatric lower gastrointestinal disorders.

• 무역상무연구
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• 제29권
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• pp.143-172
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• 2006

This study focuses on the risk management of "Digital Goods" appeared with the progress of information technology(IT) in international transaction. As a result of that digital goods have a lot of uncertainty between the general goods or service which have been deal with object of international transaction broadly because digital goods hold uniqueness. In this study, the author give a definition of "Digital Goods" and make an examination of uniqueness of that in international transaction. Next, six risks are defined base on risk theory and risk analysis matrix applying risk mapping model is made. Conclusionally, risk transfer as insurance is adequate to manage business risk, security risk, credit risk and legal risk. Meanwhile, risk avoidance is adequate to manage reputation risk and market risk. But, this study have following three limits. Firstly, concerning definition of the risk, real case is not applied owing to lack of transaction data. Secondly, measuring of the risk is not based on absolute data but relative data. Lastly, suggesting way of risk management is not concrete and practical to international trader of digital goods.

• Journal of Acupuncture Research
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• 제18권5호
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• pp.24-32
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• 2001

Objective : The purpose of this study was to inspect the effect of Oriental medicacl treatment with following up NTx and absorbing rate of bone in degenerative osteoarthritis. Methods : To obtain this result, we examinated 52 case of parents who visit Dept. of Acupuncture and Moxibustion Oriental Medical Hospital. Taejon University. We observe their age, sex, symptoms and change of NTx and ALP. Results : As a result of this examination, we detected the fact that it's difficult to decending NTx, but we are convinced that Oriental medicine has a good effect clinically. Conclusion : We take very useful result from this study, and want to be put this knowledge to practical use on treating Osteoporosis think the study like this must be go on continuously.

• Journal of Acupuncture Research
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• 제18권6호
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• pp.44-52
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• 2001

Objective : This study had been done to develop treatment and preventation on HIVD by using this result. Methods : To obtain this result, we examinated 51 case of patients who visit Dept. of Acupuncture and Moxibustion. Oriental Medical Hospital. Taejon University. diagnosed HIVD. Results : As a result of this examination, we detected the fact that reattack rate is 3.9% and it is important to exercise physically to prevent growing worse symptoms. And we develop further method of treatment to treat people more effectively. Detailed contents are as followed. Conclusion : We want to be put this knowledge to practical use on treating HIVD and think the study like this must be go on continuously.

• Transactions on Electrical and Electronic Materials
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• 제10권6호
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• pp.196-199
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• 2009

The practical applications of piezoelectric ceramics are applied not only under low electric field environment. Therefore, an examination for characteristics of PZT ceramics under the high electric field condition can contribute to reducing the susceptibility of multifarious applications and to facilitating production of control circuits. These contributions can lead to the expansion of industrial applications. In this research, we fabricated disk-type PZT ceramic samples using conventional methods, measured the resonance characteristics of these samples under from low to high voltage conditions and calculated the PZT constants.

• Perspectives in Nursing Science
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• 제13권1호
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• pp.10-16
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• 2016

Purpose: This study aimed to investigate differences in drinking scores according to stress and depression. Methods: A secondary analysis of the 5th and 6th Korea National Health and Nutrition Examination Surveys was conducted. Complex sampling design data analysis was performed in order to identify differences in Alcohol Use Disorder Identification Test (AUDIT) scores according to stress and depression among 1,732 unmarried women. Results: The average AUDIT score was 6.14 in unmarried women. There were significant differences in AUDIT scores in terms of stress and depression. Conclusion: Practical programs that can prevent alcohol drinking for unmarried women are suggested. Programs for alcohol-related problems should include stress and depression management.