• 보일러설비
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• no.2 s.145
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• pp.108-111
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• 2006

몇해전부터 우리는 고유가라는 새로운 시대에 살면서도 고유가를 위한 합리적인 대안이 무엇인지에 대해 고민해보는 일은 매우 소홀하게 여기고 있다. 과연 인류최대의 현안인 환경문제와 에너지문제를 동시에 해결할 대체에너지는 없는지... 이러한 궁금증에 대해 관심을 갖는 이들은 매우적다. 우리는 태양열, 태양광발전, 바이오매스, 풍력, 소수력, 지열, 해양에너지, 폐기물에너지 8개분야의 신재생에너지중 풍력발전에 대해 알아보고 현재 국 · 내외에 설치돼 있는 풍력발전시스템에 대해 알아보고자 한다.

• Communications of Mathematical Education
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• v.14
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• pp.229-250
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• 2001

협동 학습은 학습자간의 긍정적 상호 작용을 촉진하여 학습의 극대화를 도모하고자 하는 수업 방법으로, 수학 과목에서 협동 학습은 수학에 대한 성취도, 태도, 문제 해결력 등 인지적, 정의적 영역에서 긍정적인 효과를 나타내고 있다. 이에 본고에서는 수학 과목에서 협동학습에 대한 국${\cdot}$내외의 연구 동향을 살펴보고, 중학교 학생들의 학습양식과 수학성취도와의 관계를 조사하여 학습양식에 따라 소집단을 구성한 수학에서의 협동 학습을 모색하고자 한다.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.05a
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• pp.37-38
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• 2000

어업에서는 어획대상 이외의 어종이 어획되는 이른바 혼획이 일어나며, FAO의 보고서(Alverson et al. 1994)에 의하면 전세계 어획량의 약 25%가 법률적 또는 경제적 이유로 인하여 선상에서 투기되고 있다. 따라서 UN환경개발회의(1992)에서 선언된 "Agenda 21(21세기를 향한 행동지침)"에서는 어업이 지구환경에 영향을 주는 산업으로 인지되었으며, FAO 총회(1995)에서 채택된 "책임있는 수산업 규범"에서는 세걔의 각 어업국에 비목표 어종의 혼획 및 미성숙 소형어의 투기 감소를 촉구하고 있다.(중략) 투기 감소를 촉구하고 있다.(중략)

• Information and Communications Magazine
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• v.25 no.5
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• pp.30-37
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• 2008

릴레이(Relay station)는 이동통신 시스템에서 음영 지역 해소를 위해 도입된 기술로서 현재 널리 사용되고 있다. 과거의 방식이 단순히 신호를 증폭해서 보내는 리피터(Repeater)의 기능에 국한된 것에 비해 최근에는 보다 지능화된 형태로 발전하고 있다. 더 나아가 릴레이 기술은 차세대 이동통신 시스템에서 기지국 증설 비용과 백홀 통신망의 유지비용을 줄이는 동시에 서비스 커버리지 확대와 데이터처리율 향상을 위해 반드시 필요한 기술로 평가받고 있다. 이에 본 고에서는 릴레이 기술의 일반적인 분류와 도입 시나리오 및 요소 기술에 대해 살펴보고 표준화가 진행 중인 IEEE 802.16j Relay TG (Task group)의 동향 그리고 무선 인지 환경하에서의 릴레이 도입의 가능성에 대해 기술한다.

• Journal of Korean Society of Forest Science
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• v.99 no.3
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• pp.380-390
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• 2010

This research was conducted to investigate the consciousness of demander on National Forest Management System and to seek for solution to activate it by measuring the variables such as the extent of goal achievement on the system, the extent of importance on function of national forest, benefit for participation of the system, and the extent of importance on the system as well as the extent of demander recognition and intention of participation on the system like, Cooperative Forest Program and People's Forest Program. The target of this investigation is to categorize consumers of National Forest Management System (NFMS) into four types such as environmental organization that do not participate in the system, environmental organization that participate in the team, company to publish a white paper on environmental and local government. As a result, the intention of participation was showed in C Type (62.7%), among fields that respondents interested in participation were tree planting and forest tending (56.2%). However, the rest of the participants were reluctant participate in the NFMS due to more benefit (72.2%) of corporate social responsibility from other fields than those from the field utilizing forestry. If only, diverse facilities related to national forest and active supporting policy are provided by Korea Forest Service, social participation using forest resources would be considered. Although 61% among A Type recognized NFMS in advance, the prime reason for not utilizing are the problems with reserving place for participates in and the inconvenience to participate in on-site. Type D shows slightly high interest in People's Forest Program (3.69). Also, it shows high interest in Forest Recreation (4.15) and Forest Reports (3.90). Particularly, it indicates that GyeongGi-Do and GangWon-Do local government prefers Forest Experience, and Cheolla, ChungCheong and GyeongSang local government prefer Forest Reports. Based on the above study, we finally suggest that legal alignment of the system, and the provision of incentive for inducement of voluntary participation by Corporate Social Responsibility (CSR), and establishment of new exclusive nongovernmental organization be able to operate the system as the solution to activate NFMS in terms of the consumer.

• Journal of the Korean Data and Information Science Society
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• v.26 no.5
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• pp.1071-1085
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• 2015

The researchers attempted to develop a way to extract a near real-time online nation image using social media. Referring to previous studies about nation images and the categories defined in Wikipedia, an ontology considering the characteristics of nation image was constructed. Separately, data sets from various social media were compared and the click view of Wikipedia English-edition was selected. The ontology was applied to the recent six years of the data extracted of the three big exporting countries of the east Asia, China, Japan, and Korea. To compare the nation images, correspondence analysis was employed to show images in the area of politics, society, culture, and economy. The nation images extracted are indeed the reasonable representation of them. The researchers verified them to a few known government policies and confirmed that it could be used to help government officers to make foreign policies to boost nation's export and to employ as a key performance index for them.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.23 no.2
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• pp.173-188
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• 2024

With the advancement of autonomous vehicle (AV) technology, autonomous driving on real roads has become feasible. However, there are challenges in achieving complete autonomy due to perceptual blind areas, which occur when the AV's sensory range or capabilities are limited or impaired by surrounding objects or environmental factors. This study aims to analyze AV accident patterns and safety issues of perceptual blind area that may occur in urban areas, with the goal of developing test scenarios for Level 4+ autonomous driving. It utilized AV accident data from the California Department of Motor Vehicles (DMV) to compare accident patterns and characteristics between AVs and conventional vehicles based on activation status of autonomous mode. It also categorized AV disengagement data to identify types and real-world cases of disengagements caused by perceptual blind areas. The analysis revealed that AVs exhibit different accident types due to their safe driving maneuvers, and three types of perceptual blind area scenarios were identified. The findings of this study serve as crucial foundational data for developing Level 4+ autonomous driving test scenarios, enabling the design of efficient strategies to mitigate perceptual blind areas in various scenarios. This, in turn, is expected to contribute to the effective evaluation and enhancement of AV driving safety on real roads.

• Korea Trade Review
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• v.43 no.4
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• pp.155-175
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• 2018

This study estimates the technical efficiency and total factor productivity(TFP) of and analyzes the relationship between TFP and exports for Korean manufacturing companies from 2000 to 2016. Specially, TFP is decomposed into Technical Change(TC), Technical Efficiency Change (TEC), and Sale Effect(SE), and compared between large and small enterprises. First, in the case of technical efficiency, the Korean economy has been very vulnerable to external shocks, such as the sharp decline following the 2008 financial crisis. The efficiency of the electronics, automobile, and machinery sectors is low and needs to be improved. In addition, the technological efficiency of large enterprises is higher than that of SMEs in most manufacturing sub-sectors except for non-ferrous metals. In the case of TFP, most changes are due to TC, and the effective combination of labor, capital and the effect of scale have little effect, suggesting that improvement of internal structure is urgent. In addition, volatility due to the impact of the financial crisis in 2008 was much larger in SMEs than in large companies, so external economic impacts are more greater for SMEs than large enterprises. The relationship between TFP decomposition factors and exports shows that TC has a positive effect only on exports of SMEs. Therefore, in order to increase exports, in the case of SMEs, R&D support to promote technological development is needed. In the case of large companies, it is necessary to establish differentiated strategies for each export market, competitor company, and item to link efficiency and scale effect of exports.

• International Commerce and Information Review
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• v.13 no.3
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• pp.97-118
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• 2011

The Korea-Chile FTA talks began in December 1999 and concluded in October 2002, with official endorsement in April 2004. This FTA of a first for Korea, went into effect on April 1 in 2004. The purpose of this study to measure the Chile product evaluation in the Korean consumer after Korea-Chile FTA signed. The major result of article can be summarized as the follows: This paper investigates the determinants of 'product attitude', 'quality recognition', 'price recognition', 'use safety', 'use convenience', and 'design(appearance)'. There are 500 sended samples and 487 returns, 476 of them are analyzed for a entry competitiveness. In the analysis result of the article, The first, multiple regression result shows that the Chile goods evaluation are positively affected by the 'product attitude', 'price recognition', 'use safety', 'use convenience', and 'design(appearance)'. However, The 'quality recognition' factor do not affect in Chile goods evaluation.

• International Commerce and Information Review
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• v.16 no.3
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• pp.225-251
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• 2014

This study was intended to confirm a positive correlation between a understanding and utilization and performance results of the FTA in Gangwon-do. To this end, eighty-six companies(90% SMEs) which participate in both import and export were surveyed regarding their understanding and utilization of the FTA, and current performance was analyzed. The research results are as follows. First, we found a positive correlation between 1) a company's global orientation (as measured in export density as a percentage of profit) and 2) its competitiveness (as measured in annual sales), and a company's degree of utilization of FTA provisions. Second, we found that increased awareness of the provisions of Korea's FTAs was positively correlated with the degree to which companies were able to benefit financially from Korea's FTAs. Third, however, at the time of this study's completion, FTA utilization was not yet positively correlated with statistically significant performance results. Therefore, to increase the utilization and performance of FTA, the Korean government have to make a efficient business models for each industry and support the small and mid-size businesses including Gangwon province's SMEs.