• 한국주거학회논문집
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• 제22권2호
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• pp.53-61
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• 2011

This study aims to examine the characteristics of the changes in residents' perception of neighborhood and sense of neighborhood according to the residential structural changes caused by city renewal projects such as old urban large redevelopment. Research findings benefits of the residential environment changes after the development are environment improvement, convenient traffic, leisure activity increase, and green area increase, whereas their drawbacks are encroachment of sunshine and view, However, with the regard to the relationship with neighbors, paired-sample t-test results showed there were no statistically significant differences between before and after the development. It appeared to be that the community residential complex development did not influence the relationship with neighbors. ANOVA was used to examine the differences in the neighborhood perception among age categories. The results showed that there were no differences between age groups but when there were changes in their life cycle, residents showed differences in their neighborhood perception among age groups. The neighborhood perception was measured on 5-point Likert Scale in four factors of intimacy, participation, reliability, and group identity. The perception decreased somewhat after the development and the group identity, especially, showed a significant difference (p<.001). This was considered to be caused by a sense of incongruity due to the influx of different social-economic groups.

• Korean Chemical Engineering Research
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• 제46권1호
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• pp.156-163
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• 2008

화학공장에서는 공정 이상, 장치 수명 및 경제적 환경 등에 의하여 변경이 발생하고 있다. 그리고 변경관리는 정확한 기술적 판단근거에 의한 변경 판정, 위험도 확인 및 위험성 평가 수행 등 근본적인 공정안전 기술을 바탕으로 이루어진다. 그러나 변경관리는 경험 부족, 지식 부족 및 기술인력 부족 등의 이유로 수행하기 매우 어려운 상황에 놓여있다. 본 연구에서는 화학공장 변경관리의 취약점을 파악하고 이를 적절히 보완하여 안전성을 향상할 수 있는 변경관리 체계를 구축하였다. 위험성 평가를 기반으로 하는 변경관리 절차의 정립 및 변경 여부 판단, 변경시 위험도 산정 등 변경관리 의사결정 단계들의 명확한 판단 기준 체계 정립을 통한 장치산업의 변경관리 수행 체계를 제안하였다. 이러한 안전공학 기술이 접목된 형태의 변경관리 절차를 제안하여 화학공장의 안전성 향상을 꾀하고자 하였다.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2007년도 동계학술발표대회 논문집
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• pp.459-465
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• 2007

This study was conducted to calculate the LCC of a apartment complex with a type of heating system, district heating and cogeneration system. For the purpose of analyzing LCC according to size of apartment complex, 500, 1,500 and 4,000 houses of model apartment selected. This research performs design of heating system and the life cycle cost analysis including an initial cost, energy cost, maintenance and operation cost, replacement cost and renovation cost during the project period(15years). According to the calculated results, 1) Initial cost of cogeneration system with 500, 1500 and 4000 houses is higher than district heating system each of 20%, 13%, 12%. 2) In case of cogeneration system, the payback period by electric generation is 5.21, 4.92 and 4.47 years and saving cost was calculated 29 billion won, 94 billion won and 262 billion won after payback period. 3) Cogeneration system LCC was 1.12, 1.07 and 1.06 times larger than district system with the size of apartment complex. According to the case of this study district heating system is more efficient than cogeneration system in terms of the reduction of LCC. 4) Gas Engine Co-generation System is more efficient than other systems because it can collect progressive part from electric charge progressive stage system. However, the efficiency is decreasing because of raising of fuel bills(LNG) and lowering of power rate for house use. Especially the engine is foreign-made so the cost of maintenance and repair is high and the technical expert is short. 5) District heating is also affected by fuel bills so we should improve energy efficiency through recovering of waste heat(incineration heat, etc.). Also, we should supply district cooling on the pattern of heat using of let the temperature high in winter and low in summer.

• 설비공학논문집
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• 제27권10호
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• pp.544-551
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• 2015

This study was conducted to determine the LCC of apartment complexes with district heating and a cogeneration system. For the purpose of analyzing LCC according to the size of the apartment complex, 500, 1,500, and 4,000-unit model apartments were selected. Analysis was performed on the design of the heating system and the life cycle cost including total construction cost, maintenance and operation cost for the duration of the project period (15 years). According to the calculated results, 1) The initial cost of the cogeneration system for 500, 1,500, and 4,000-unit apartments is higher than that of the district heating system by 20%, 13%, and 12%, respectively. 2) In the case of the cogeneration system, the payback period by electric generation was found to be 5.21, 4.92 and 4.47 years, and saving cost was calculated to be 29 billion won, 94 billion won and 262 billion won after the payback period for 500, 1,500, and 4,000-unit apartments, respectively. 3) The LCC values of the cogeneration system were 1.12, 1.07 and 1.06 times larger than those of the district system according to the size of the apartment complex. In this study, the district heating system was found to be more efficient than the cogeneration system in terms of LCC reduction. 4) District heating is affected by fuel bills, so energy efficiency should be improved through recovering waste heat (incineration heat, etc.). Also, district cooling should be provided according to heat use to keep the temperature high in winter and low in summer.

• 한국국방경영분석학회지
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• 제35권2호
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• pp.15-31
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• 2009

본 논문은 방위사업청 개칭이후 국방획득체계 운영과정에서 드러난 몇 가지 비효율적인 문제점을 분석하고, 이를 개선하는데 필요한 방안을 모색하는데 있다. 이것은 앞으로 국방부가 획득체계를 개선할 시 참고자료로 활용하는데 도움을 줄 수 있을 것이다. 제시된 방안들은 첫째, 국방부와 방위사업청간 중기계획 및 예산편성에 관한 기능을 재정립해야 한다. 둘째,소요-획득-운영유지의 통합관리체계 구축을 통해 경제적 획득관리 및 전력발전을 도모해야 한다. 셋째, 소요-획득분야 인력순환(순환근무)을 제도화하고, 획득인력의 전문성 강화를 위해 인력관리법 및 전문교육체계를 구축해야 한다. 그리고 넷째, 무기체계 '총수명주기체계관리'를 시행하고, 방위사업청 주도의 개발 및 운용시험평가 방식을 개선해야 한다. 이것은 국방부-방위사업청-각 군 간 획득사업을 둘러싸고 파생되는 업무혼선과 갈등을 최소화하는데 있어 필수적인 요소들이다.

• 한국BIM학회 논문집
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• 제5권4호
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• pp.53-62
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• 2015

Korea has been at the forefront of green growth initiatives. In 2008, the government declared the new vision toward 'low-carbon society and green growth'. The government subsidies and Feed-in Tariff (FIT) increased domestic usage of solar power by supplying photovoltaic housing and photovoltaic generation systems. Since 2000, solar power industry has been the world's fastest growing source with the annual growth rate of 52.5%. Especially, BIPV(Building Integrated Photovoltaic) systems are capturing a growing portion of the renewable energy market due to several reasons. BIPV consists of photovoltaic cells and modules integrated into the building envelope such as a roof or facades. By avoiding the cost of conventional materials, the incremental cost of photovoltaics is reduced and its life-cycle cost is improved. When it comes to atypical building, numerous problems occur because PV modules are flat, stationary, and have its orientation determined by building surface. However, previous studies mainly focused on improving installations of solar PV technologies on ground and rooftop photovoltaic array and developing prediction model to estimate the amount of produced electricity. Consequently, this paper discusses the problem during a planning and design stage of BIPV systems and suggests the method to select optimal design of the systems by applying the national strategy and economic policies. Furthermore, the paper aims to develop BIM tool based on the engineering knowledge from experts in order for non-specialists to design photovoltaic generation systems easily.

• 대한가정학회지
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• 제31권1호
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• pp.97-120
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• 1993

This study is designed to understand marital relationships of the rural couples in Korea. The primary purposes of this study are to examine the relationship between marital satisfaction and role evaluation of the spouse and to construct a path model in which shows the relationships among background variables, role evaluation of the spouse and marital satisfaction. Structured guestionnaires from 435 couples with school-age children and teenagers living in rural area are analyzed in this study. The major findings are as follows : 1. Factor analysis of the role evaluation of the spouse results I 4 factors for both husbands and wives; emotional support-sexual role child socialization-economic role, kinship role and housekeeping role. 2. The most important factor influencing the marital satisfaction is the role evaluation of the spouse o emotional support-sexual relation. While the number of children, and role evaluations of the spouse influence directly on the marital satisfaction of the wives, age, level of education, level of income and husband's occupation influence indirectly through role evaluations of the spouse on that of wives. 3. For husbands, family life cycle and their occupation influence indirectly on the marital satisfaction of the husbands and the marital satisfaction of them is also mediated by role evaluations of the wieves. Level of income of the family not only influences directly on marital satisfaction but influences on it indirectly. 4. Marital satisfaction is mediated by role evaluations of the spouse. The role evaluation of the spouse on emotional support-sexual relation has the most powerful effect on the marital satisfaction for both wives and husbands. About 60 percent of the variance in the marital satisfaction of rural couples can be explained by the role evaluation of the spouse. therefore, the result of the result of the study indicates that the role evaluation of the spouse on emotional support-sexual relation plays a significant part in determining the marital satisfaction of rural couples.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 Asia Navigation Conference
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• pp.105-114
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• 2006

Together with the trend of enhancement in domestic industrial development and economic progress due to import and export, the demand for construction of the roads, bridges, especially port facilities, and several coastal protection and ocean structures is increasing rapidly. MOMAF of Korean Government is driving construction of 9 new ports and renovation of the existing fishery ports. Among these structures most of bridge base, wharves, dolphins, quays, and jetties are being newly built of steel or concrete pile. As the base, supporting bulkheads, and piles are underwater after construction, it is difficult to figure out the status of structures and not enough to get maintenance and strengthen the structures. Every year, moreover, these works suck the government budget due to higher incomplete maintenance expense for protection from corrosions of structures and increased underwater construction period. for the purpose of cutting down the government budget, it is necessary to extend the life cycle of the existing structures. We developed a new method for maintenance of submerged structures near the waterline by allowing dry work environment with the floating caisson. The method shows easy to move around the working area and handle. It also showed not only a significant reduction of maintenance expenses and time for anti-corrosion work but also better protection. This will be a milestone to reduce the maintenance and construction expenses for the shore and water structures.

• 한국산학기술학회논문지
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• 제16권11호
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• pp.7893-7901
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• 2015

공용중인 교량의 보다 안전하고 효율적인 유지관리를 위해서는 시간에 따른 교량 유지관리 정보의 수집과 분석이 중요하다. 교량관리시스템을 통한 안전하고 경제적인 관리를 위한 전략 수립의 기본이 되는 현장조사 정보의 신뢰도 및 획득의 편의성을 증진하기 위하여 교량 현장조사용 스마트폰 응용프로그램을 개발하고, 실 적용성을 확보하였다. 개발된 프로그램은 교량의 생애주기관리를 위한 교량관리시스템과 연계되어 유지관리 관련 정보의 조회, 수정, 전송 등이 실시간으로 가능하며, 현장조사 보고서의 자동 작성을 통해 업무를 크게 경감할 수 있을 것으로 판단된다. 본 프로그램을 이용한 점검은 편의성, 정확성 등의 향상, 정보의 지속가능성, 향후 활용성 등 직간접적으로 기대되는 가치향상 효과가 기존의 점검방법에 비해 매우 높을 것으로 기대된다.

• 한국환경농학회지
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• 제30권4호
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• pp.453-458
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• 2011

BACKGROUND: Coleosporium plectranthi, an obligate parasite, which is responsible for the rust disease of Perilla frutescens, a plant in Korea, commonly known as Perilla. All rusts are obligate parasites, meaning that they require a living host to complete their life cycle. They generally do not kill the host plant but can severely reduce growth and yield. Food and feed spoilage fungi cause great economic losses worldwide. It is estimated that between 5 and 10% of the world food production is wasted due to fungal deterioration. Rust disease of Perilla is highly frequent and is widely spread in Korea. The present study was designed to investigate a novel media for the urediniospore germination in vitro and anti-rust activity as well as GC-MS analysis of oak pyroligneous liquor. METHOD AND RESULTS: Urediniospores were collected from the infected leaf of Perilla. Spore suspension was made and the suspension was inoculated in the 2% water agar media with proper humidity, then they were incubated at $26^{\circ}C$ for 56 hrs. The GC-MS analysis of the oak pyroligneous liquor was also done to check the chemical composition. GC-MS analysis of the wood vinegar was found 15 compounds, among them o-mthoxyphenol (25.93%), 2,6-dimethoxyphenol (16.06%), 4-methylenecyclohexanone (10.69%), 2,3-dihydroxytoluene (7.84%), levoglucosane (6.14%) and propanoic acid (5.32%) were the major components. Different concentration of the oak pyroligneous liquor was used, and spore inhibition was recorded on the basis of spore counting. The best results were noted at the concentration of 50% solution where 31.8% spores were inhibited. CONCLUSION: On the basis of the chemical composition of the oak pyroligneous liquor and the activity recorded we can use it as an anti-rust agent.