• 한국수학교육학회지시리즈C:초등수학교육
• /
• 제20권2호
• /
• pp.153-162
• /
• 2017

본 연구는 수학교수에서 중요도가 높은 관행들(High-leverage Teaching Practices [HLPs])에 대해 예비교사들이 스스로 자각하고 있는 준비도를 조사하였다. 미국 중서부에 위치한 대학에서 수학교육방법론을 수강하고 있는 81명의 예비초등교사들이 HLPs에 대한 자신감 및 능력에 대한 자가응답을 요하는 설문조사에 참여하였다. 특히 이 연구는 예비교사들이 자각하고 있는 HLPs에 대한 준비도와 수학교사교육자들이 예측하고 있는 교사교육 진행과정에 대한 비교 연구를 하였다. 연구결과는 예비교사들과 수학교사교육자들이 HLPs의 복잡성에 대해 상당히 다른 견해를 보이고 있음을 제시하고 있다. 본 연구는 교사교육 프로그램들이 각각의 수학교수관행을 세분화하여 고찰할 수 있는 구체적인 기회를 예비교사들에게 제공할 것을 제안한다.

• 한국태양에너지학회 논문집
• /
• 제32권3호
• /
• pp.138-145
• /
• 2012

Because of the climate changes and the development of building technologies, the cooling loads have been increased. Among the various renewable energies, geothermal energy is known as very useful and stable energy for heating and cooling of building. This study proposes a road snow-melting system of which heat is supplied from GSHP(Ground source heat pump) in viewpoint of the initial investment and annual running performance, which is also operating as a main facility of heating and cooling for common spaces. The results of this study is as followings. From the site measurement, it is found out that the road surface temperature above the geothermal heating pipe rose up to $5^{\circ}C$, which is the design temperature of road snow-melting, after 2 hours' operation and average COP(Coefficient of performance) was estimated as 3.5. The reliability of CFD has confirmed, because the temperature difference between results of CFD analysis and site measurement is only ${\pm}0.4^{\circ}C$ and the trend of temperature variation is quite similar. CFD analysis on the effect of pavement materials clearly show that more than 2 hours is needed for snow-melting, if the road is paved by ascon or concrete. But the road paved by brick is not reached to $5^{\circ}C$ at all. To evaluate the feasibility of snow-melting system operated by a geothermal circulation which has not GSHP, the surface temperature of concrete-paved road rise up to $0^{\circ}C$ after 2 hour and 40 minutes, and it does never increase to $5^{\circ}C$. And the roads paved by ascon and brick is maintained as below $0^{\circ}C$ after 12 hours geothermal circulation.

• 한국의류학회지
• /
• 제33권11호
• /
• pp.1719-1732
• /
• 2009

A firm seeking to enter a foreign market must make an important strategic decision of which market entry mode to use. Because entry modes involve resource commitments, the initial choice by a firm on a particular entry mode is difficult to change without a considerable loss of time and money. Substantial prior research has been undertaken to explain why firms select a particular entry mode into global markets. However, there exists limited research on this area in the field of foreign apparel brands in Korea, although some research has analyzed influential entry mode factors when Korean textile and clothing companies went overseas. This study reviews prior research on the entry mode choice and analyzes the factors that influence the entry mode choice for 510 foreign clothing brands in Korea. Price range, clothing types, distribution strategy, and cultural distance were considered as influential determinants for different entry mode choices. Crosstabs with a chi-square test and logistic regression are used for analysis. This study shows that high-priced brands and luxury brands are associated with the export orientated entry mode in the Korean market. Brands that pursued the strategy of multiple distribution channels showed a preference for a licensing mode or direct investment over other entry modes, and brands from higher-cultural-distance countries entered the Korean clothing market by licensing mode. The findings of this study are appropriate for the strategic planning of foreign apparel intent on entering the Korean market or for Korean apparel firms planning to enter the global market.

• 대한기계학회논문집A
• /
• 제26권1호
• /
• pp.121-130
• /
• 2002

Clean stockers are being used by semiconductor and TFT-LCD manufacturers to store and buffer work in process. Since an important function of a stocker is to keep the contained material clean. The only way to keep the stored product clean is to provide constant clean airflow the product and through stocker, The airflow across the product prevent contamination from settling on the product. Up to now, stocker typically have been configured to receive their laminar airflow from fan filter units that are located on the side of the stocker This type of stocker may have such problems as complexity of structure, increment of temperature, mechanical vibration, initial investment and running cost. In this study, In order to solve the above mentioned problems, new air control system in stocker is proposed, which is to control open ratios of exits that are located on the side of the stocker without fan filter units. Open ratios of exits need to be optimized for the same quantities of airflow in each exit. In this study, static pressure regain was used for the analysis of the open ratios of exits theoretically and Blue Ridge Numerics FEM software, CFDesign, was used fur simulating airflow in stocker. As a result, Open ratios of exits important to provide constant clean airflow can be obtained by the analysis of static pressure regain and was verified by simulation results. Therefore, new air control system in stocker can be used by the semiconductor and TFT-LCD manufacturers.

• 한국건축시공학회지
• /
• 제10권3호
• /
• pp.91-97
• /
• 2010

현재 건물 부력에 대한 보호조치로 경제성 및 효율성 측면을 고려하여 영구배수 공법의 사용이 증가하고 있다. 영구배수공법은 건축물에 접하는 지하수를 외부로 배수시켜 건축물에 작용하는 부력을 근본적으로 제거하는 공법으로, 영구배수공법 사용시 유출지하수가 발생하게 된다. 또한 우리나라는 국제인구행동연구소(PAI)에서 지정한 물 부족 국가로 지정되어 유출지하수의 활용이 요구되고 있지만 이에 대한 평가프로세스가 아직 충분하지 않다. 따라서 본 연구는 현장 적용 사례를 통해 현장 단위에서 유출되는 지하수의 활용여부를 결정할 수 있는 평가 프로세스를 구축하고 경제성을 분석하였다. 그 결과 상수도와 비교한 10년간 상수절감 비용을 통해 유출지하수의 활용이 가능한 것으로 나타났다.

• 한국건설관리학회논문집
• /
• 제6권6호
• /
• pp.171-180
• /
• 2005

공공임대주택은 공공이 건설, 소유하고 관리하는 임대주택으로 사업주체는 건설부터 폐기처분에 이르는 전 과정을 관리하게 된다. 일반분양주택 사업주체가 초기투자비에 적극적인 관심을 보이는 반면, 공공임대주택 사업주체는 초기투자비와 더불어 건물의 유지보전을 위해 지출되는 수선비에 관심을 기울이지 않을 수 없다. 하지만 국내 공공임대주택의 수선비용은 단지 회계상의 지출요소로 관리되어 왔을 뿐, 체계적인 실태조사 및 분석에 대한 선행연구가 많이 부족한 실정이다. 따라서 본 논문은 공동주택 LCC모델링이나 수선비 예측모델의 신뢰성 향상 및 실무적 활용성 제고를 목적으로 공공임대주택에 지출된 수선비 실적자료를 바탕으로 통계적 방법을 활용, 경과연수와 지출비용과의 관계, 단지별 수선비 지출차이, 준공 후 시기에 따른 수선비 지출 경향에 초점을 맞추어 실태를 분석하였고, 단지별 수선비 지출격차가 발생하는 원인과 경과 연수에 따른 수선비 변화의 특성을 파악하여 제시하였다.

• 한국산학기술학회논문지
• /
• 제21권9호
• /
• pp.569-574
• /
• 2020

플로팅도크는 육상에서 건조된 선박을 해상으로 진수하기 위한 주요한 설비이다. 2000년대 초반 국내에서 육상에서 건조한 선박을 플로팅도크를 이용하여 진수할 수 있는 육상 건조 공법이 개발 적용됨에 따라 드라이도크에 대한 투자 없이 신조 사업에 참여할 수 있는 기회가 대폭 확대되었다. 본 논문에서는 이러한 육상 건조 공법을 활용하여 드라이도크를 보유하지 않은 중소업체에서 건조한 선박을 진수시킬 수 있는 플로팅도크의 안전한 계류를 위한 기본 계산을 수행하고 이를 기반으로 계류 시스템을 설계하였다. 본 논문은 적재 중량 4,000 Ton급 플로팅도크를 대상으로 하여, 플로팅도크가 설치되어 운영될 대불부두의 환경 요건 중 가장 심각한 상황인 태풍 상황을 고려하여 수행되었다. 설계 하중의 계산은 국제적으로 통용되는 기준을 따라 풍하중, 조류하중, 파에 의한 하중을 고려하였다. 대불 부두의 기존 계류 설비를 활용하여 플로팅 도크의 계류 로프 초기 배치를 수행한 후 주어진 하중에 따라 계류 로프별로 최소 파단 강도를 계산하였다. 계산 결과를 바탕으로 최소 파단 강도를 줄일 수 있도록 계류 배치를 일부 수정하였으며 최종 계류 라인의 규격을 선정하였다.

• 유통과학연구
• /
• 제14권10호
• /
• pp.147-152
• /
• 2016

Purpose - High quality films are affected by both the production stage and various variables such as the size of the movie investment and marketing that changes consumers' perceptions. Consumer preferences should be recognized first to ensure that the movie is successful. If a film is produced without pre-investigation and analysis of consumer demand and taste, the probability of success will be low. This study investigates the balance of production costs, marketing costs, and profits using game theory, suggesting an optimization strategy using the simplex method of linear programming. Research design, data, and methodology - Before the release of the movie, initial demand is assumed to be driven largely by marketing costs. In the next phase, demand is assumed to be driven purely by a movie's production cost and quality, which might also further determine consumer demand. Thus, it is essential to determine how to distribute pure production costs and other costs (marketing) in a limited movie production budget. Moreover, it should be taken into account how to optimally distribute under the assumption that the audience and production company's input resources are limited. This research simplifies the assumptions for large-scale and relatively small-scale movie investments and examines how movie distribution participant profits differ when each cost is invested differently. Results - When first movers or market leaders have to choose both quality and marketing, it has been proven that pursuing a strategy choosing only one is more likely than choosing both. In this situation, market leaders should maximize marketing costs under the premise that market leaders will not lag their quality behind the quality of second movers. Additionally, focusing on movie marketing that produces a quick effect while ceding creative activity to increase movie quality is a natural outcome in the movie distribution environment since a cooperative strategy between market competitors is not feasible. Conclusions - Government film development policy should ignore quality competition between movie production companies and focus on preventing marketing competition. If movie production companies focus on movie production quality improvement then a creative competition would ensue.

• 농촌계획
• /
• 제19권4호
• /
• pp.73-79
• /
• 2013

As facilities performing the production, processing, preservation, and shipment of agricultural products; agricultural facilities are categorized into planting facilities and livestock facilities based on the management target. Agricultural facilities are set in farmlands, and facility users mainly complain about the legal or institutional restrictions on farm rather than their own facilities itself. From 2009 to 2012, the Ministry of Agriculture Food and Rural Affairs (MAFRA) published the "Casebook of farmer Complaints on Farmlands" in order to help answer farmers' questions and support public workers' workloads. However, contents related to agricultural facility installed in farmland are currently not dealt with in particular. Among agricultural facilities, demands of property rights with livestock facilities have risen due to construction permissions, operational restrictions, and high initial investment costs; and relevant laws were revised and are now being executed. However, for planting facilities such as mushroom facilities, ginseng facilities, and greenhouses; farmer complaints related to property rights are constantly increasing because revisions to relevant laws are not being made despite the rising diversity of construction materials through technical developments as well as the rising scale of assets-i.e. mechanization, automation, and the application of New Regeneration Energies according to capital influx. In this study, the current state of relevant agricultural facility legislation were organized and their drawbacks deduced in order to propose improvements of Agricultural Facility Legislation. The result of interviewing with public workers and farmers show that agricultural facilities should be regarded as extensions of farmlands rather than as facilities built in land where development actions were being taken. Alternatives able to reflect these opinions were suggested through expert consultation.

• 환경위생공학
• /
• 제23권3호
• /
• pp.9-22
• /
• 2008

This study was conducted to develop a system that processes harmful gases and dust, which being generated in the production of micro-inorganic fabric. This can be obtained by melt spinning raw materials such as agalmatolite, fluorspar, limestone, silica under high temperature at $1500-1600^{\circ}C$ in a glass recuperator using a dry method by Cyclone Reactor or Envelope Type (ET) type Bag Filter. If the number of the members of Korea Glass Industry Association reaches up to 45, the damage of the harmful gas being generated in recuperator should not be small. In addition, research of existing facilities showed the most of harmful gas treatment facilities which adopt wet treatment or semi-dry treatment process. This was caused the problems for wastewater and the second pollutive materials. Moreover, in the dust collecting facility behind recuperator, it is also problematic that electric dust collector requires enormous initial investment. We have researched various methods to show both economic and efficient new processes for the preventive facilities of recuperator. As the result of the experiments, the removal efficiencies of HF and SOx were 99% and 87%, respectively. Although it was insignificant reaction, a pretty much interesting result that NOx showed an absorption reaction with $Ca(OH)_2$(removal efficiency was more than 25%) was obtained.