• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2003년도 춘계학술대회 논문집
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• pp.478-483
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• 2003

Performance Evaluation of end mills for high speed cutting has been performed in a view of dynamic characteristics and noise-vibration under operation. The tools tested in this research consist of three foreign country made and one korean made. In addition, numerical models using finite element method are established, which are confirmed by experimental results. The evaluation results has been feedback fur developing high performance end mills for high speed cutting tools.

• 정보처리학회논문지D
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• 제11D권3호
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• pp.659-670
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• 2004

임베니드 소프트웨어의 품질시험을 통해 임베디드 시스템 子매자늘의 요구에 부합되는 고품질의 시스템을 구현할 수 있다. 임베디드 소프트웨어의 경우, 아직까지 국내에서 활용할 수 있는 구체적인 품질시험 체계가 구축되어 있지 않은 실정이다. 최근 다양한 임베디드 시스템들이 개발되고 있으나 결함으로 인한 리콜 등 품질면에서 많은 문제점들이 노출되고 있다. 본 연구에서는 임베디드 소프트웨어 평가를 위해 ISO/IEC 12119를 근간으로 하여 품질시험을 수행할 수 있는 평가모듈과 품질검사표를 개발하여 임베디드 소프트웨어 평가에 적용할 수 있도록 하였다.

• 비교교육연구
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• 제23권5호
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• pp.19-52
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• 2013

이 논문은 한국과 스웨덴의 학교평가 시스템을 기술하고 학교 자체 및 외부 평가라는 두 영역에서 두 나라간 교육환경에 따른 평가정책의 양상을 상호 비교하고자 한다. '학교의 질 제고' 및 '교육 분권화'의 방향으로 세계 교육환경의 관심이 전환되면서, '교육 평가'의 중요성에 대한 인식 또한 증대되고 있다. '학교 평가'를 통해 기술되어지는 교육 기관들의 취약점을 보완하고, 이들이 가진 강점을 고양시켜 장기적 관점에서 학교 질제고에 기여할 수 있게 된다는 것이다. 연구문제는 한국과 스웨덴에서 시행되고 있는 학교평가의 양상이 두 나라의 교육환경에서 어느 정도 변용되어 시행되고 있는가 이며 연구내용은 '평가목표, 도구, 기준 및 결과 처리 방법'의 범위에서 학교자체평가를 '평가기관, 기준 및 결과처리 방법'의 영역에서 학교외부평가의 양상을 한국과 스웨덴으로 나누어 살펴보고 교육환경의 차이가 가져다준 학교평가의 유사점 및 상이점을 분석하는 것이다. 이를 위해 인터뷰 및 문서 자료 분석을 중심으로 한 질적 연구를 수행하였다. 연구결과에서는 교육 분권화가 정착단계에 있는 스웨덴과 과도기에 있는 한국의 학교평가 양상은 상당히 다른 모습을 보이고 있음을 각 범주별로 기술하고 논의하였다. 이에 교육정책의 양상은 각 나라의 교육환경과 밀접한 관련을 맺고 있으며 한국과 스웨덴 간 학교평가정책 운영의 우위를 논하기 보다는 분권화 정도에 따라 교육평가 정책이 효율적으로 운영되고 있는지를 논의하였고 앞으로 차용할 외국의 교육정책 또한 현 국가의 실태에 맞춰 변용할 필요가 있음을 언급하고 있다.

• 농촌지도와개발
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• 제11권2호
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• pp.251-265
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• 2004

The agricultural sector's economic structure in Korea is regarded to encounter major barriers on the way toward revitalizing its economic prosperity. Among many, the energy-related problem is one of prime nuclei embedded in the country's agricultural sector. The ought-to-come structural changes in the country's agricultural energy system hinge upon the central government's policy direction as well as efforts of local governments and local farming community members. The indirect aids via 'cross subsidy' of electricity tariff rate and 'tax-exempt price' of oil fuels are two notable causes of the unsustainable energy consumption pattern in the country's agricultural sector. As measures, demand-side management(DSM) and energy-efficiency promotions are regarded to be the most attractive methods for energy conservation and economic productivity as well. Development of renewable energy sources are also receiving a great deal of attention for the long-term alternatives to the country's existing oil-based agricultural production mode. This study examines the contributive potential of DSM approaches and renewables-based technologies. With the critical evaluation on the concurrent adversities of the country's agricultural energy system, various sources of renewable energy-solar power, wind power, biomass, etc.-are examined for the purpose of technological and economical viability. As sufficient potentials of renewable energy sources are being estimated, both the system production cost and the installation cost for the county's rural areas are expected to lower in the long term. DSM options are also evaluated to be fruitful even in the short term. Both the public and civil arenas must galvanise each side's effort in order to promote these policy options and community potentials.

• 농업과학연구
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• 제47권4호
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• pp.1083-1096
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• 2020

Global attention to the greenhouse gas emissions from deforestation and forest degradation is increasing. There is a growing recognition of reducing emission from deforestation and forest degradation plus (REDD+) as an effective way to reduce greenhouse gas emissions in the forestry sector. The Republic of Korea is implementing REDD+ pilot projects in four Southeast Asian countries as part of its efforts to reduce greenhouse gas emissions. This study evaluates countries with the potential to become priority partner countries for Korea's REDD+ programs, using the following five criteria: The first criterion is that a country should include the forest sector and REDD+ in its national plan for reducing greenhouse gas (GHG) emissions. The second and third criteria refer to an average forest coverage rate of over 44% and a forest change rate of over - 0.1%, among the countries with forest cover of more than 10 million ha. The fourth criterion is that the country should meet the Forest Reference Emission Level requirements, one of the four elements of the Warsaw REDD+ Framework. The fifth criterion is that the country should have bilateral relations with the Republic of Korea in forestry while at the same time be a partner country for cooperation on climate change as well as a REDD+ pilot country. Based on our evaluation, we conclude that the first priority countries are Indonesia, Cambodia, and Myanmar. The second priority countries include Brazil, Ecuador, and Peru. Finally, the third priority countries are Columbia, Congo, and Mozambique. This study suggests that for the selection of priority partner countries, Korean REDD+ programs should center on existing REDD+ pilot countries.

• KIEAE Journal
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• 제12권2호
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• pp.83-92
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• 2012

Recently, many countries are tightening a variety of policies and controls with great efforts to reduce emission of GHGs(Greenhouse Gases) as concern for climate change heightens. The purpose of the study is to provide guidelines for planning and evaluate element and evaluate housing development. The elements are also assorted into 6 sections and 30 planning elements were drawn from them. It is drawn to 6 sections, 27 categories, 31 evaluation elements except cultural and perceptual aspects unrelated to planning elements from these elements. Case analysis has shown that most of planning elements were applied because these cases obtained environment-friendly certification in the country. Followings are the common characteristics. Firstly, it showed that application of planning element in all cases is excellent. Secondly, the case with excellent application of elements related with energy and application degree obtained excellent degree i environment-friendly certification in the country. Finally, application of planning elements related with renewable energy was in poor condition in all cases. With the utilization of SBTool, the evaluation results about planning elements of housing complex of Carbon emissions-reduction type showed that CASE-A obtained 11.17 points and CASE-B obtained 9.24 points. In the case of renewable energy section, it was confirmed that the evaluation doesn't work well. As a result, changes of planning elements affect environment-friendly extent. It was confirmed that accessibility to housing complex of Carbon emissions-reduction type could change. Estimated result of Amount of Carbon emission showed that annual energy consumption per each family of CASE-A is $4,269,964MJ/m^2$, as a result of which, Carbon emission is $234,815kg/m^2$. And annual energy consumption per family of CASE-B is $4,197,563MJ/m^2$, as a result of which, Carbon emission is $214,584kg/m^2$. Application of planning elements in the aspect of housing complex of Carbon emissions-reduction type shows that the level for Carbon emissions-reduction is high level. And study with assessment from the draft should be followed.

• International Journal of Fluid Machinery and Systems
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• 제2권4호
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• pp.353-362
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• 2009

In the process of turbine modernizations, the investigation of the influences of water passage roughness on radial flow machine performance is crucial and validates the efficiency step up between reduced scale model and prototype. This study presents the specific losses per component of a Francis turbine, which are estimated by CFD simulation. Simulations are performed for different water passage surface roughness heights, which represents the equivalent sand grain roughness height. As a result, the boundary layer logarithmic velocity profile still exists for rough walls, but moves closer to the wall. Consequently, the wall friction depends not only on roughness height but also on its shape and distribution. The specific losses are determined by CFD numerical simulations for each component of the prototype, taking into account its own specific sand grain roughness height. The model efficiency step up between reduced scale model and prototype value is finally computed by the assessment of specific losses on prototype and by evaluating specific losses for a reduced scale model with smooth walls. Furthermore, surveys of rough walls of each component were performed during the geometry recovery on the prototype and comparisons are made with experimental data from the EPFL Laboratory for Hydraulic Machines reduced scale model measurements. This study underlines that if rough walls are considered, the CFD approach estimates well the local friction loss coefficient. It is clear that by considering sand grain roughness heights in CFD simulations, its forms a significant part of the global performance estimation. The availability of the efficiency field measurements provides an unique opportunity to assess the CFD method in view of a systematic approach for turbine modernization step up evaluation. Moreover, this paper states that CFD is a very promising tool for future evaluation of turbine performance transposition from the scale model to the prototype.

• KDI Journal of Economic Policy
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• 제42권1호
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• pp.57-95
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• 2020

As a case study of an ex-post evaluation of regulations, in this paper I evaluate the 'uniform settlement rate requirement', a regulation that was introduced in 1986 and that was applied to the international telephone market in the U.S. for more than 20 years. In a bilateral market between the U.S. and a foreign country, each U.S. firm and its foreign partner jointly provide international telephone service in both directions, compensating each other for terminating incoming calls to their respective countries. The per-minute compensation amount for providing the termination service, referred to as the settlement rate, is determined by a bargaining process involving the two firms. In principle, each U.S. firm could have a different settlement rate for the same foreign country. In 1986, however, the Federal Communications Commission introduced the Uniform Settlement Rate Requirement (USRR), which required all U.S. firms to pay the same settlement rate to a given foreign country. The USRR significantly affected the relative bargaining positions of the U.S. and foreign firms, thereby changing negotiated settlement rates. This paper identifies two main routes through which the settlement rates are changed by the implementation of the USRR: the Competition-Induced-Incentive Effect and the Most-Favored-Nation Effect. I then empirically evaluate the USRR by estimating a bargaining model and conducting counterfactual experiments aimed at measuring the size of the two effects of the USRR. The experiments show remarkably large impacts due to the USRR. Requiring a uniform settlement rate, for instance, results in an average 32.2 percent increase in the negotiated settlement rates and an overall 13.7 percent ($3.43 billion) decrease in the total surplus in the U.S. These results provide very strong evidence against the implementation of the USRR in the 1990s and early 2000s.

• 통상정보연구
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• 제12권2호
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• pp.357-381
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• 2010

The purpose of this paper is to investigate the effects of consumer's preferences for foreign products and extrinsic cues such as brand, country of origin, and corporate reputation on the consumer's evaluation which includes the construct of perceived quality, and loyalty. In addition, this paper is aimed to provide Korean firms insights in strategic approaches about foreign consumers behavior. A conceptual model is developed and empirically tested against a sample of university students in Korea, who have buying experience of products from multinational firms. 290 samples were used for this analysis. Results of multiple regression analysis using SPSS 18.0 show that consumer's preferences for foreign products, brand awareness, and corporate reputation have a significant effect on the perceived quality of the product from multinational firms. The most important factor to influence the perceived quality was found to be a corporate reputation. But country of origin had not significant effect. Also it is found that both product and product related service quality are positive and statistically significant in explaining the customer's loyalty. Implications for increasing perceived quality and customer's loyalty for Korean products in the global market are discussed.

• 한국산업융합학회 논문집
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• 제15권1호
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• pp.5-11
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• 2012

The Buckling of the member under compressive stress is likely to occur, which is an important factor determining the strength of structures. The objective of this study was to evaluate the member buckling strength of a circular hollow steel with ball joints and to compare with design specifications for load resistance factor of our country. Furthermore, we would like to suggest basic data for evaluation of buckling length of a circular hollow steel with ball joints according to comparative analysis. These results were summarized as follows: Buckling stress according to the test results on buckling was 1.21 times greater than LSD specifications of our country estimated the entire length of circular hollow steel with ball joints as buckling length. In addition, it was 1.16 times greater than when estimating the length except the ball as buckling length and 1.14 times grater than when excluding the ball and sleeve. Therefore, when estimating buckling stress of circular hollow steel with ball joints, their buckling length may be measured by the length except ball and sleeve.