• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2010년도 춘계학술대회 논문집
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• pp.65-66
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• 2010

To improve the gear noise quality, gear tooth grinding machine are widely used in automotive industry. While using the gear profile grinding machine to improve the gear tooth quality of the transmission, several defects such as chattering, tooth waves that cause the gear noise occasionally happened. But it is very difficult to solve that problem, because there is no one who knows the setting up the optimal grinding condition appropriately. The abnormal manufacturing conditions which make the gear noise make the engineer to spend a lot of time, effort, and money. Due to demands for solving the serious abnormal gear noise happened in the new FF 6th stage automatic transmission in the mass product stage, the vibration checking process in the worm wheel axis, work rotation and fixed axis of the grinding machine were adapted to find the root causes. As a result, gear profile wave are affected by the work rotation axis's unbalance which is caused by worm wheel feeding speed. And a primary and the secondary grinding feeding speed, cutting oil, work fixed forces are also proved as the important factors. After setting up the grinding condition reported in this paper, it was adapted successfully to the grinding machine to manufacture the new FF 6th speed automatic transmissions' output gear. The gear noise was dramatically disappeared and the process and results will offer good guides to the engineers who manufacture the gear with the grinding machine.

• 한국소음진동공학회논문집
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• 제20권7호
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• pp.665-671
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• 2010

To improve the gear noise quality, gear tooth grinding machine are widely used in automotive industry. While using the gear profile grinding machine to improve the gear tooth quality of the transmission, several defects such as chattering, tooth waves that cause the gear noise occasionally happened. But it is very difficult to solve that problem, because there is no one who knows the setting up the optimal grinding condition appropriately. The abnormal manufacturing conditions which make the gear noise make the engineer to spend a lot of time, effort, and money. Due to demands for solving the serious abnormal gear noise happened in the automatic transmission in the mass product stage, the vibration checking process in the worm wheel axis, work rotation and fixed axis of the grinding machine were adapted to find the root causes. As a result, gear profile wave are affected by the work rotation axis's unbalance which is caused by worm wheel feeding speed. And a primary and the secondary grinding feeding speed, cutting oil, work fixed forces are also proved as the important factors. After setting up the grinding condition reported in this paper, it was adapted successfully to the grinding machine to manufacture the new automatic transmissions' gear. The gear noise was dramatically disappeared and the process and the results will offer good guides to the engineers who manufacture the gear with the grinding machine.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2010년도 추계학술대회 초록집
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• pp.38.2-38.2
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• 2010

Biomimetc is a new domain of learning that proposes a solution getting clues from nature. There seems to be a sign of this phenomenon in fields of Renewable Energy. Foe example, Wind power was imitate the whale's fin that was improve efficiency of generating energy. This study focused on the photovoltaic generation as the instance of applying biomimetic. Efficiency is the most important factor in field of Photovoltaic generation. When given solar cell taking the sun light, most important fields of the study are absorb more light and increase the quantity of generation. For improving efficiency, the solar cell were builded up textures of taking a pyramid form, such a surface structure taking a role for remaining the light. This effects do the role as increasing absorbing efficiency. Such phenomenon calls Light Trapping, locking up the light on the surface of solar cell for a long time. Light is a vital factor to plants in the nature. Plants grow up through the photosynthesis that absorbing light for growth and propagation. So, plants make a effort how can absorb more the light in poor surroundings. This study set up a goal that imitates the minute surface structure of plants and applies to the existing solar cells's surface structure, so it can improve the efficiency of absorbing light. We used Light Tools software analyzing geometrical optics to analyze efficiency about new designed textures on the computer. We made a comparison between existing textures and new designed textures. Consequently, new designed textures were advanced efficiency, absorbing rates of light increasing about 7 percent. In comparison with existing and new textures, advancing about 20 percent in the efficient aspect.

• 벤처창업연구
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• 제9권6호
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• pp.231-244
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• 2014

국내의 경기불황과 기업의 구조조정, 명예퇴직, 청년들의 취업난 등으로 인하여 창업시장의 경쟁이 치열해 졌으며, 이러한 경기불황은 창업을 생계유지를 위한 하나의 대안으로 부추기는 실정이다. 그러나 아무런 준비 없이 뛰어든 창업은 부도라는 결과를 초래하기도 한다. 성공적인 창업이 되기 위해서는 체계적인 지식과 기술이 필요하다. 창업자의 역량은 선천적인 것이 아니라 후천적으로 얻어지는 경우가 많다. 그러므로 본 연구는 성공한 벤처기업 창업자들의 성공요인을 분석하여 창업교육의 일환으로써 교육적 시사점을 제시하는데 목적이 있다. 벤처기업 창업자의 성공요인은 창업자의 특성을 통해서 총18개의 항목으로 도출하였으며, 창업자에게 요구되어지는 역량에 대한 교육적 시사점을 다음의 여섯 가지로 제시했다. 첫째, 창업자의 성취욕구적 특성과 목표지향적 특성은 창업교육의 요소로 활용가능하다. 둘째, 성취욕구적 특성은 창업 준비단계의 교육적 요소이며, 목표지향적 특성은 창업 후에 기업을 경영하기 위한 교육적 요소이다. 셋째, 창업자의 경험을 통한 학습은 매우 중요하므로 실무체험은 반드시 필요하다. 넷째, 창업교육은 젊은 층을 대상으로 하는 것이 효과적이다. 다섯째, 창업역량을 측정하여 예비창업자의 부족한 역량을 개발할 수 있는 교육적 지원이 필요하다. 마지막으로 창업교육자는 창업경험이 있는 사람이 현실적용 가능성을 고려하여 경험과 노하우를 전수해야한다.

• 한국병원경영학회지
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• 제8권4호
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• pp.26-58
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• 2003

This research first finds out the resources, activities, and effectiveness of quality management effort and the resulting customer satisfaction when the total quality management is lacking in most Korean medical agencies today. Then, it analyzes the relationship among the factors mentioned earlier. This paper utilizes actual data and presents a theoretical model which explains that the resources of quality management affect the activities and that the fruit of the quality management effort benefits the customers in the end. In addition, this study conducts a corroborative analysis through executing a survey, getting a descriptive statistical result on the subjects' characteristics and the research variables using SPSS 9.0 WIN PROGRAM, and the model is approved through analyzing its make-up using LISREL 8.12 WIN PROGRAM. The study's finding is the following: First, the management leadership affects the worker's, educational training, the quality of medical service, and the survey of customer satisfaction positively. However, it does not affect the quality of work positively. Second, the internal customer satisfaction affects the worker's participation, educational training, the quality of medical service, and the survey of customer satisfaction positively. Third, the quality of medical service and the survey of customer satisfaction affects the result of quality management positively, but the worker's participation, educational training, and the quality of work do not affect the result of quality management positively. Fourth, the management leadership does not appear to affect the result of quality management positively. Fifth, the internal quality management appears to affect the result of quality management positively. Sixth, the external customer satisfaction appears to affect the result of quality management positively. In conclusion, the findings in this study indicate that medical agencies need to utilize the active variables of quality management in order to successfully establish a total quality management.

• Journal of Dairy Science and Biotechnology
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• 제25권2호
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• pp.33-40
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• 2007

The Korean dairy industry has been developed continuously for the past seventy years both in quality and quantity; now the total amount of dairy products accounts for 13 percent of that of livestock production - a remarkable turnover. Korea now stands at the 13th economic power around the world and it is inevitable that we must pursue an open-door policy at a global level; the dairy industry should also strengthen its potentialities in the long term in order to compete with advanced dairy countries. It is predicted that the impact of DDA agreement and FTA negotiations on the domestic dairy industry will be great; so it is urgently needed that we should reconsider the current status of the dairy industry and comprehensive mesures for dairy industry development to improve its international competitiveness. Such measures comprise the three aspects: first, reforming the policy of dairy industry-related systems, second, improving the productivity and third, expanding the consumption of dairy products. In terms of the system reforming, the most important things are, above all, the planned production relevant to market needs, the milk supply and demand management, and the raw milk transaction method. Secondly, the appropriate scale of management is important for the enhancement of productivity together with the modernization of dairy facilities. Thirdly, step-up effort is needed to expand the milk consumption; especially, more milk should be provided to the students by improving the standing milk ration system in middle and senior high schools. The government should make more effort to support and develop new dairy products tuned to consumers' taste, accelerating the publicity of diverse and steady milk consumption together with related organizations.

• 한국환경교육학회지:환경교육
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• 제8권1호
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• pp.66-80
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• 1995

The purpose of this study was to investigate the housewives's recognition and practice on prevention of environmental pollution. The subjects of this study were 250 housewives, school students' mothers, living in Cheong-ju. Major findings were as follows: 1. In washing their faces and brushing their teeth, they saved the water very well, but in taking bath, washing the dished, using the water of the lavatory they did not save the water so well. 2. The kinds of the cleansers differed in taking a bath, washing the hair, and doing the laundry respectively : what they use most was hard soaps in taking bath, liquid cleansers mixed with shampoo and linse in washing the hair, and synthetic powder detergent in laundrying. They used more synthetic detergent than natural soaps, which is known to be a cause of water pollution. Especially, when they cleansed, they did not use a measuring cup. It resulted in the waste of detergent and accelerating of water pollution. Therefore, the environmental education for them was very urgently needed. 3. In handling domestic waste, the separate collection rate of empty bottles and old newspapers was very high, but that of used phone-call cards and used batteries was extremely low. It was truly nessesary to educate and step up publicic activities on the separate collection of phone-call cards and batteries caused environmental pollution. 4. The housewives had much knowledge about environmental pollution, but they did not practice it so well in their home. 5. The housewives made more effort than their children in preventing environmental pollution and saving resources. In conclusion, what is most important for solving environmental problem was for each citizen to make an effort to prevent environmental pollution, and the government's support and producing the atmosphere of the society for this was really needed.

• Spatial Information Research
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• 제17권2호
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• pp.243-249
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• 2009

최근 10년간 발생한 자연재해 중 태풍의 피해는 전체의 60%를 넘을 정도로 풍수해의 피해는 막대하며, 지속적 산업화와 개발로 인해 피해 규모 역시 매년 1조원 이상을 상회하고 있어, 자연재해에 대한 피해 경감 노력이 매우 요구되고 있다. 이를 위하여 최근 풍수해의 피해를 사전에 예측함으로써 예방 및 대비는 물론 재해 발생에 따른 응급 대응 및 복구의 효율성을 제고를 목적으로 과학적 방법론 개발 및 연구가 진행되고 있다. 태풍에 의한 피해 예측은 위험도 (Hazard)의 추정, 피해 대상 자료의 구축 (Inventory) 및 피해대상의 취약도 (Fragility)의 세 가지 요소를 이용하여 수행되는 것이 일반적이다. 위험도는 자연재해의 특성인 강우, 풍속 등을 물리적으로 모델링함으로써 추정할 수 있으며, 피해 대상 자료는 공공 및 사유 시설물을 총 망라함으로써 피해의 사회, 경제적인 피해 규모 예측에 활용된다. 각각의 피해 대상이 위험도에 따라 갖는 취약도는 최종 피해 및 손실 규모의 평가 자료로 이용된다. 이때 위험도의 추정 및 피해 대상자료의 구축을 위한 핵심적인 방법론으로서 지리정보시스템의 활용이 크게 요구된다. 따라서 본 연구에서는 태풍 피해 예측을 위한 자연재해 위험성 평가 방법론에 있어서 매우 중요한 요소인 고도 및 자연 지형, 지표의 특성 및 활용도, 피해 대상인 인공 시설물 등의 자료 항목을 분류하여 지리정보시스템을 활용한 태풍 위험 평가 방안을 제시하였다.

• 한국문헌정보학회지
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• 제7권
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• pp.197-223
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• 1980

This paper consists of two parts: the first part discusses general problems of microforms as transmission and storage media of research information, especially in view of user's reactions to this unconventional media. Many articles and surveys from major American library journals and other professional publications have been mentioned and reviewed to find out the common issues which could be relevent to Korean case. The latter part is the analysis of the two sets of surveys. One was done from 5 research libraries in Seoul and the other, from 150 researchers who were the users of the libraries. The major findings are: The research libraries in Korea are in the infant stage of building their microform research collection. They are doing their special effort to level up the weaknesss of the collection. Presently, general level of usage is very low, although the users showed a positive attitude toward this unaccustomed media. They are well convinced with necessity of use of microforms in their research and they have correct ideas about some of the problems they are going to face along with the eventual heavier use of the materials. They are psychologically ready to accept them and to make a good use out of them if some of the external conditions for proper use of the material would be guaranteed.

• Advances in aircraft and spacecraft science
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• 제7권5호
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• pp.405-423
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• 2020

Non-linear energy sink (NES) is an emerging passive absorber able to mitigate the dynamic response of structures without any external energy supply, resonating with all the modes of the primary structure to control. However, its inherent non-linearities hinder its large-scale use and leads to complicated design procedures. For this purpose, an approximate design approach is herein proposed in a stochastic framework. Since loads are random in nature, the stochastic analysis of non-linear systems may be performed by means of computational intensive techniques such as Monte Carlo simulations (MCS). Alternatively, the Stochastic Linearisation (SL) technique has proven to be an effective tool to investigate the performance of different passive control systems under random loads. Since controlled systems are generally non-classically damped and most of SL algorithms operate recursively, the computational burden required is still large for those problems that make intensive use of SL technique, as optimal design procedures. Herein, a procedure to speed up the Stochastic Linearisation technique is proposed by avoiding or strongly reducing numerical evaluations of response statistics. The ability of the proposed procedure to effectively reduce the computational effort and to reliably design the NES is showed through an application on a well-known case study related to the vibrations mitigation of an aircraft wing.