• 한국과학교육학회지
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• 제41권3호
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• pp.193-202
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• 2021

본 연구에서는 과학 논변 활동에 참여하는 학생들이 비생산적, 생산적 논변 실행에서 각각 어떠한 인식론적 자원들을 활성화시키는지 탐색하고, 논변 실행 변화에 어떤 맥락이 기여하는지를 알아보고자 하였다. 이를 위해 과학 논변 활동에 참여한 소집단 학생들의 수업 실행과 면담을 녹화 및 녹음하여 전사했으며, 학생 활동지와 연구자의 필드노트를 수집하여 본 연구의 분석 자료로 활용하였다. 분석 결과, 초점 집단은 비생산적 실행에서 전파, 신뢰, 축적 자원을 활성화시키다가 생산적 실행에서 구성, 이해, 축적, 형성, 반박 자원을 활성화시키는 것으로 나타났다. 이러한 인식론적 자원 변화에 따른 실행 변화에 기여한 맥락은 친숙하지 않은 형태의 논변 과제가 제공된 것과 더불어 소집단 내 인식적 권위자의 정서적, 인식적, 개념적 지원이 작용한 것으로 분석되었다. 본 연구는 학습자의 맥락 의존적인 인식론에 따른 실행 변화를 분석하는 연구들에 추가적인 사례 연구로 제공될 수 있으며, 추후 학생들의 진정한 과학 참여를 위해 생산적인 인식론의 형성 및 안정화에 대한 논의에 기여할 수 있을 것으로 기대한다.

• 제어로봇시스템학회논문지
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• 제11권9호
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• pp.802-809
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• 2005

A hybrid genetic algorithm is proposed for the problem of generating laser torch paths to cut a stock plate nested with free-formed parts each having a set of sub-parts. In the problem, the total unproductive travel distance of the torch is minimized. The problem is shown to be formulated as a special case of the standard travelling salesman problem. The hybrid genetic algorithm for solving the problem is hierarchically structured: First, it uses a genetic algorithm to find the cutting path f3r the parts and then, based on the obtained cutting path, sequence of sub-parts and their piercing locations are optimally determined by using a combined genetic and heuristic algorithms. This process is repeated until any progress in the total unproductive travel distance is not achieved. Computational results are provided to illustrate the validity of the proposed algorithm.

• 벤처창업연구
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• 제13권4호
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• pp.139-154
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• 2018

본 연구는 일부 청년들이 정부의 창업지원제도를 악용하는 사회적 현상에 주목하여 대학생 예비창업가들을 대상으로 그들의 부정적 성격변인 수준이 초기창업에 미치는 영향을 조사하는데 주요 목적이 있다. 대학생의 부정적 성격변인은 심리학 대표적인 부정적 성격변인이자 흔히 어둠의 3요소라고 알려진 나르시시즘, 마키아벨리즘, 사이코패시를 주요 변수로 설정하였고, 초기창업에는 창업이벤트 모델과 계획행동이론에 기반하여 창업의지, 창업효능감, 창업동기(생산적 비생산적 동기)를 주요 변수로 설정하였다. 연구 결과 어둠의 3요소 중 나르시시즘 성향만 창업의지에 유의한 정적(+) 영향을 미치는 것으로 나타났다. 나르시시즘 성향은 창업효능감에도 유일하게 정적(+) 영향을 미치는 것으로 나타났다. 사이코패시 성향은 창업효능감에 부적(-) 영향을 미치는 것으로 나타났으며, 마키아벨리즘 성향은 영향이 없는 것으로 나타났다. 다음으로 창업동기와 관련하여 어둠의 3요소 중 나르시시즘 성향은 생산적 창업동기에 정적(+) 영향을 미치는 것으로 나타났으며, 마키아벨리즘 성향은 부적(-) 영향, 사이코패시는 아무런 영향이 없는 것으로 나타났다. 한편 어둠의 3요소 중 마키아벨리즘과 사이코패시 성향은 비생산적 창업동기에 유의한 정적(+) 영향을 미치는 것으로 나타났으며, 나르시시즘 성향은 아무런 영향이 없는 것으로 나타났다.

• KDI Journal of Economic Policy
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• 제27권2호
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• pp.205-237
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• 2005

본 논문은 기업의 주주가 경영자에게 경영을 대리하게 하여 본인-대리인관계(principal-agent relationship)가 발생하는 상황에서 상품시장경쟁이 기업의 내부효율성에 영향을 미치는 메커니즘을 분석한다. 본 논문에서는 두 종류의 기업을 고려한다. 하나는 기존기업(incumbents)이고, 다른 하나는 신규 진입기업(entrants)이다. 각 기존기업의 주주는 경영자에게 경영을 위임하고 경영자의 노력을 관찰하지 못하여 도덕적 해이가 발생한다. 기존기업의 경영자는 두 종류의 일을 수행하는데, 하나는 비용절감을 위한 노력(생산적인 노력)이고, 다른 하나는 진입장벽을 구축하기 위한 노력(비생산적인 노력)이다. 기존기업의 수로 측정되는 경쟁도의 증가는 두 가지 효과를 유발한다. 하나는 '산출효과'로서 경영자의 생산적인 노력을 감소시키고, 다른 하나는 '노력대체효과'로서 비생산적인 노력을 감소시키고 동시에 생산적인 노력을 유도한다. 본 논문은 어떠한 조건에서 시장경쟁이 생산적인 노력에 대한 유인을 제공하는 비용을 감소시켜 기업의 내부효율성을 증진하는가를 살펴본다.

• 한국초등과학교육학회지:초등과학교육
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• 제31권3호
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• pp.372-385
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• 2012

For decades, reflection has been recognised as a meaningful tool to bring forth teachers' ownership as well as knowledge and action empowerment in teacher education. Yet there have been few studies on elementary teachers' reflection on their science teaching in Korea. In this study, 71 reflective journals of 24 elementary teachers on their science teaching were analyzed. The characteristics of reflective journals were analyzed in terms of 'productive reflection', a concept suggested by Davis (2006). Unproductive reflection is mainly descriptive without analysis, whereas productive reflection can promote teachers' learning by integrating four aspects of teaching (learner/learning, subject matter knowledge, instruction and assessment). The result showed what elementary teachers consider and emphasize and how they integrate their ideas. Most of reflective journals included aspects of 'instruction', 'learner/learning', and 'subject matter knowledge'. However 'instruction' was emphasized most frequently (69.0%) than 'subject matter knowledge' (33.8%) and 'learner/learning' (26.8%). 'Assessment' was hardly included nor emphasized. More than half of the journals (56.3%) showed no integrations, which were unproductive reflection. A third of the journals (32.4%) integrated only two aspects among four. Average score of integrations was 1.6 on a scale of 4 points. The integrations were not affected by the length of reflective journals and the teaching experience. These findings suggest that productive reflection would not increase naturally with teaching experience and there needs more tactful guidance to develop elementary teachers' productive reflection on their science teaching.

• KDI Journal of Economic Policy
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• 제38권3호
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• pp.37-52
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• 2016

This paper analyzes the effects of allocative efficiency on productivity in the manufacturing sector of Korea following Hsieh and Klenow (2009). The results of this research indicate that the overall allocative efficiency declined from 1990 to 2012. Using the method of Oberfield (2013), which allows inter-industry resource movement as well as intra-industry reallocation, we confirm that intensified misallocation generally results from intra-industry allocative inefficiency. The potential loss from instances of worsening misallocation is estimated to be approximately 0.6% points for each year, which is considerable in terms of the overall TFP. In terms of the firm size distribution, initially large establishments are more likely to expand if distortions are removed in most countries. One notable feature in Korea is that this pattern is pronounced. This implies that subsidies to unproductive small-sized establishments are heavily implemented.

• 경영과학
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• 제17권2호
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• pp.39-54
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• 2000

This paper presents a causal forecasting model using guided genetic algorithm in continuous manufacturing process. The guide genetic algorithm(GGA) is an extended genetic algorithm(GA) using penalty function and population diversity index to increase forecasting accuracy. GGA adds to the canonical GA the concept of a penalty function to avoid selecting the unproductive chromosomes and to make a proper searching direction. Also, GGA modifies the current population using the similarity of chromosomes to avoid falling into the trap of local optimal solution. For investigation GGA performance, we used a set of real data that was collected in local glass melting processes, and experimental results show the proposed model results in the better forecasting accuracy than linear regression model and canonical GA.

• 전기학회논문지
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• 제61권4호
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• pp.632-638
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• 2012

ZigBee network, based on PHY, MAC layer provides a specification for a suite of high level communication protocols using small, low-power digital radio based on an IEEE 802.15.4 standard. Meshing is a type of daisy chaining from one device to another. This technique allows the short range of an individual node to be expanded and multiplied, covering a much larger area. Each wireless technology that makes it to market serves a special purpose or function. Zigbee provides short-range connectivity in what is called a personal-area network (PAN). Within ZigBee PAN coordinator as manages an entire ZigBee network, the short range of frequency band was only selected because the technology allows typically less than 100 kbp or ZigBee troubles in retransmission processing and delaying data tranmission works to create unproductive condition of work. This research was proposed the method, based on short range frequency of zigBee nodes enable to long range of remote data transmission with specific algorithm tools.

• 한국기술혁신학회:학술대회논문집
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• 한국기술혁신학회 2006년도 추계학술대회
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• pp.371-396
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• 2006

To see the implication of trade policy in endogeneous growth model, we introduce trade protection that takes the form of an import tariff and represents one plus the rate of protection provided to industry sector. We showed that considering goodness of fit of regression model, we can see that the empirical evidence is strongly in favor of the character of trade policies as the instrument spurring economic growth. As for import tariff, we see that 1% increase in the rate of tariff that protect domestic market causes the rate of growth to increase by 0.87%. An import tariff to final product significantly spurs product development and faster growth come as a result. But, we should note that the effects of trade policy are muted by the induced changes in the output of intermediates in an economy that is relatively unproductive in the research lab.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1997년도 춘계학술대회 논문집
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• pp.1020-1024
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• 1997

Recently the use of ceramic materals has been greatly increased in the industries. But machining of the ceramics is quite unproductive because of their high stength,high hardness,and brittleness. The efficiency of the grinding operation of ceramics depends on the preparation of diamond grinding wheel, i.e.,truning and dressing. This paper describes some experimental results on the dressing conditions of diamond grinding wheel. The dressing performance is evaluated by the magnitude of normal grinding force. The better dressed wheels result in the lower normal grinding forces. The dressing performances of copper plate and aluminum oxide dressing stick are compared. The optimum dressing conditions including the grit size of dressing sticks, the depth of the dressing operation, and the dressing speed qre determined.