• 대한기계학회논문집A
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• 제35권5호
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• pp.487-494
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• 2011

LNG / LNG-FPSO선박에 사용되는 안전밸브는 배관 시스템으로부터 유체를 방출하여 시스템의 압력을 일정하게 유지시키는데 중요한 역할을 한다. 이러한 안전밸브의 기능적 특성으로 인해 유출계수는 밸브의 성능 중 가장 큰 비중을 차지하며, 선급의 인정을 받기 위해서는 0.8이상의 유출계수가 요구되고 있다. 밸브 성능을 향상시키기 위해서 밸브 내부에서 발생하는 유동특성에 대한 정확한 이해가 필요함에도 불구하고 대부분의 밸브 설계의 경우 현장 작업자들의 경험과 실험에 의한 시행착오에 의존하고 있다. 본 논문에서는 안전밸브에 대한 유동해석을 통해 밸브 내부에 발생하는 압축성 유동현상을 고찰하였고, 실험과 해석에 의한 유출계수를 비교하여 유동해석의 타당성을 검증하였으며, 안전밸브를 지나는 공기의 질량유량을 예측하기 위한 유동해석 모델을 확립하였다.

• 산업진흥연구
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• 제2권1호
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• pp.63-68
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• 2017

본 연구는 직장에서 교육훈련을 1회 이상 참여한 근로자를 대상으로 2016년 10월 10일부터 10월 28일까지 총 63부를 설문 조사 분석하였으며, 교육훈련이 직무스트레스에 어떠한 영향을 미치는지를 분석 하였다. IBM SPSS Statistics 20을 이용하여 요인분석 32개 문항을 사용하여 4개 요인을 도출하였고 유의확률 p=.000로 검증되었다. 연구결과 첫째. 직장의 교육훈련과 직무스트레스에 미치는 영향은 직장의 OJT 교육이 직무 스트레스 해소에 유의한 영향을 미치는 것으로 나타났다. 둘째, 교육훈련이 업무스트레스 간의 상관성은 OJT 교육(p<.01, ${\beta}=.526$)과 Off-JT 교육(p<.01, ${\beta}=.508$)이 업무스트레스와 상관관계가 높은 것으로 나타났다. 셋째, 경력에 따른 업무 스트레스 간의 차이는 통계적으로 유의한 영향을 미치지 못한 것으로 나타났다. 경력은 10년 이상보다 3~6년 미만이 업무스트레스에 더 민감한 것으로 분석되었다. 본 연구에서 교육훈련이 직무스트레스에 미치는 영향을 검증한 것에 의의가 있다.

• 한국태양에너지학회 논문집
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• 제36권5호
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• pp.73-89
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• 2016

To assure maximum economic benefits and the energy performance of solar water heating systems, the proper sizing of components and operating conditions need to be optimized. In recent years, a number of studies to design optimally solar water heating systems have been tried. This paper presents a design method for optimizing the various capacity-related and installation-related design variables based on life cycle cost using a genetic algorithm. The design variables considered in this study included the types and numbers of solar collector and auxiliary heaters; the types of storage tanks and heat exchangers; the solar collector slope; mass flow rates of the fluid on the hot and cold sides. The suggested method was applied for optimizing a solar water heating system for an elementary school in Seoul, South Korea. In addition, the effectiveness of the proposed optimization method was assessed by analyzing the obtained optimal solutions of six case studies, each of which was simulated with different solar fractions. It is observed that a trade-off between the equipment cost and the energy cost results in an optimal design that yields the lowest life cycle cost. Therefore, it could be helpful to apply the optimal solar water heating system by comparing the various design solutions obtained by using the optimization method instead of the engineer's experience and intuition.

• 한국컴퓨터정보학회논문지
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• 제16권12호
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• pp.197-204
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• 2011

본 논문에서는 스마트폰 기반의 산업현장 공정관리에 대한 학습 App을 연구한 논문으로 공정의 측정치 데이터를 입력하여 관리한계선을 구하고 해당 범위를 벗어나는 이상 원인을 관리하였다. 본 공정관리를 위한 데이터입력 메뉴를 통해 이상 원인의 측정치를 검출하고 지난기록을 조회하도록 하였으며, 학습도구로 사용하기 위해 교육기관의 공지사항을 게시판 형태로 제공하여 정보교류에 도움을 주었다. 또한 본 이론과 사용방법에 대한 메뉴를 추가하였다. 본 공정관리의 결과는 차트로 제공되며, 알람메시지는 색상 심볼로 경고의 레벨에 따라 명확하게 결과를 표시해 주는 UI로 설계하였다. 본 App에 대해 관련학과와 App개발학과에 설문조사를 한 결과 사용의 편의성에 활용도가 있다는 응답이 약 82%, 학습효과 대해 약 90%가 만족한다는 결과를 보였다.

• 혜화의학회지
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• 제19권2호
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• pp.25-33
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• 2011

Daoism is a very important subject that consists of oriental medicine(traditional east asia medicine). Among the many scriptures, The Zhouyi cantong qi (周易參同契, Token for Joining the Three in Accordance with the Book of Changes) is the main Chinese alchemical scripture. This book is composed with three kinds of subject, Zhouyi(周易, the Book of Changes), the Huanglao(黃老) Tradition and alchemy(鍊金, 爐火). The author's name is not signed but is concealed in the text. According to the traditional account, the legendary Han immortal from Guiji (會稽, in present-day Zhejiang, 古 浙江), Wei Boyang(魏伯陽), wrote it in the period between Emperor Shun and Emperor Huan of the Eastern Han (126-127 BC), after reading the Longhu jing (龍虎經, Scripture of the Dragon and Tiger). Later he transmitted it to Xu Congshi(徐從事), who appended a commentary, and to Chunyu Shutong(淳于叔通), who first circulated it in the world. While some features of this account provide significant details - especially about the reputed date of the text and about its formation having taken place in stages - the received Cantong qi(參同契) actually is not the product of a single generation of authors, but the result of several centuries of textual accretions as well as theory of three co-authorship by Wei Boyang(魏伯陽), Xu Congshi(徐從事), Chunyu Shutong(淳于叔通). It has over 6000 characters in four-word or five-word verses. Some parts of the book are in styles of prose and poem. Many scholars explain the title "cantongqi(參同契)", saying that "Can(參)" means three, "Tong(同)" means correspondence, and "Qi(契)" means unification. Through images of hexagrams of the Book of Changes, the book illustrates the thought of the Huanglao(黃老) Tradition and alchemy. Wei Boyang(魏伯陽) theorizes his own experience unifying the way of intercourse of Yin and Yang in the Book of Changes, the cultivation of spirit through spontaneity of the Huanglao(黃老) Tradition and the elixir refining of alchemy.

• 한국환경복원기술학회지
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• 제16권1호
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• pp.171-180
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• 2013

As the second-largest 1st degree of ecological zone in Kangwon Province, Pyeongchang County is expected to play an important role in expanding the protected areas of the Republic of Korea. However, Pyoungchang County is expected to experience an increase in demand for development due to the 2018 Winter Olympics. Problems related to various stakeholders and limited budget will arise regarding the issue of expanding the protected areas. In this study, in order to effectively control these problems, we designed expansion plans for the 1st degree ecological zoning map areas and the observed data of threatened species I and II in Pyoungchang County by using the MARXAN Software. As for the methods, we first set the planning units(PUs) for the spatial analysis. The PUs include boundary length, land cost, land status, etc. Then, we made the input data by controlling the conservation features, BLM(Boundary Length Modifier) and iteration numbers. There are two measures for the establishment of the protected areas, one of which only concerns with the ecological priority, and the other with combining the land cost on forest. The one illustrated shows that the larger patches that include the conservation feature was selected as a candidate of the protected areas. The other one presented shows that inexpensive land cost areas were selected. As this study produces visual results and enables an efficient application of various values in selecting protected areas, we believe that it will be useful to various stakeholders in spatial decision-making process.

• Radiation Oncology Journal
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• 제2권2호
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• pp.185-190
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• 1984

To assess the result of radiation therapy for fifteen fears experience, a total of 125 cases of pathologically proven supraglottic laryngeal cancer had been analyzed according to patient survival retrospectively. All the patients had been treated with radiation therapy in curative aim using Co-60 teletherapy machine. The results are as follows ; 1. According to AJCC staging, five year survival rate was $58.3\%$ in stage I, $44.4\%$ in II, $31.8\%$ in II, and $28.6\%$ in IV. 2. According to T-staging, five year survival rate was $57.1\%$ in T1, $40.5\%$ in T2, $34.0\%$ in T3, and $19.0\%$ in T4. 3. According to N staging, five year survival rate was $43.5\%$ in negative node group and $26.8\%$ in positive node group. 4. According to the histologic grade, the better in differentiation, the more in number of cases and the better in prognosis. 5. In summary, five year actuarial survival rate was $37.3\%$ and ten year surrival rate was $34.2\%$, and ten year survivors totalled 16 cases.

• 성인간호학회지
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• 제26권3호
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• pp.362-371
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• 2014

Purpose: The purpose of this study was to identify Compassion Fatigue (CF), Somatization, and Silencing Response (SR) among nurses and understand intermediate effects between the variables. Methods: The sample of 240 nurses who were working three shifts in medical and surgical wards, and emergency room were recruited in three hospitals with over 700 beds. A structured questionnaire was used which included CF, Somatization and SR scales. The data were analyzed using descriptive statistics, ANOVA, Pearson's correlation coefficients and stepwise multiple regression. Results: There were statistically significant differences in CF, Somatization and SR depending on perceived personal health condition, experience of turnover, co-worker support. There were significant correlations between those study variables. The result also indicated that burnout (${\beta}$=.81, p<.001) which is a part of Secondary Traumatic Stress and Somatization (${\beta}$=.79, p<.001) have the role of partial mediator in the relationship between Secondary Traumatic Stress and Silencing response. Conclusion: The results of study show that an intermediary role by Burnout and Somatization in Silencing response of nurses is important for effective human resource management in hospital nursing staffs. Effective human resource management which includes mentoring and social support system can enhance the professional quality of life of nurses, which will eventually contribute to the quality of care by those care providers and counselors.

• 한국전산유체공학회지
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• 제18권4호
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• pp.1-8
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• 2013

The performance of small-size impellers with ruled surfaces was investigated for flank milling over a wide speed range, using computational fluid dynamics analyses and gas bench tests. An impeller with a ruled surface was designed, manufactured, and tested to evaluate the effects of blade loading, the backsweep angle, and the relative velocity distribution on the compressor performance. The simulations and tests were completed using the same compressor cover with identical inlet and outlet channels to accurately compare the performance of the abovementioned impeller with a commercial impeller containing sculptured blades. Both impellers have the same number of blades, number of splitters, and shroud meridional profiles. The backsweep angles of the blades on the ruled impeller were selected to work with the same pinched diffuser as for a sculptured impeller. The inlet-to-exit relative velocity diffusion ratio and the blade loading were provided to maximize the flow rate and to minimize the surge flow rate. The design flow rate, rpm, were selected same for both impellers. Test results showed that for the compressor stage with a ruled impeller, the efficiency was increased by 0.32% with an extended surge margin without a reduction in the pressure ratio as compared to the impeller with the sculptured design. It was concluded that an increased relative velocity diffusion coupled with a large backsweep angle was an effective way to improve the compressor stage efficiency. Additionally, an appropriate blade loading distribution was important for achieving a wide operating range and higher efficiency.

• 한국실천공학교육학회논문지
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• 제4권2호
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• pp.110-115
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• 2012

IPP (Industry Professional Practice)는 학부교육(academic study)과 산업체 근무(industrial work)를 결합시킨 산학협력 교육모델로 학생들에게 학업과 현장업무를 교대로 경험하게 하여 실용교육의 효과를 극대화 시키고 또한 본인의 적성과 전공에 맞는 진로를 스스로 결정하도록 하여 궁극적으로는 대학 졸업생의 취업역량을 강화하고, 국가적으로는 청년실업 문제의 해소 및 대학과 산업체간의 인력수급 불일치 현상 등을 해소하기 위한 제도이다. 본 논문에서는 IPP 제도의 성공적인 운영을 위해 체계적이고 구체적으로 고려해야 할 학사-운영방안에 대해 검토하고 제안한다. 주요 내용은 학제개편(semester-based quarter제) 방안, 교과과정 개편방안, 학점인정(15학점) 및 성적평가 방안, 공학설계/졸업설계 운영방안, 산학연계 교과목 운영방안 및 경과조치 방안 등이다.