• Journal of Labour Economics
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• v.28 no.3
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• pp.1-37
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• 2005

This article examines the reasons for the observed discrepancy between worker's actual and required levels of schooling and the resulting economic effects in wage and labor mobility using KRIVET's Graduates Economic Activities Survey in 2005. Overeducated workers in Korea are estimated to be 10.1%-20.7% among junior college graduates and 18.8% among university graduates for their first job according to job analysis method and worker's self-assessment method each. The effects of school quality-measured by the student/teacher ratio, school building area/student ratio-on the overeducation of their graduates are found to be mostly insignificant not only junior colleges but also universities. This founding implies that the increase of education investment from schools does not acquire any recognition from the labor market. Also, the effects of overeducation and school quality on wages are found to be insignificant and job mobility has little effects on improving overeducated workers' job match.

• The KIPS Transactions:PartD
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• v.13D no.4 s.107
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• pp.593-602
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• 2006

Software development methodology has been developed for satisfying goals of improvement in productivity and reduction in time-to-market through the reuse of software assets. The current methods that implement software product-line, one of software development methodologies, interfere massively with the core assets, which require high cost in assembly level reducing the effectiveness. In this paper, we introduce Aspect-Oriented Programming (AOP) as a method for improving assembly process in software product-line. The method that assembles core assets and variabilities is described by grammar elements such as Join point, pointcut and advice without code-change. We analyze requirements of a mini-system as an example adapting AOP and design using UML. Our study implements the variabilities, which are from design stage, using an Aspect-Oriented Programming Language, AspectJ and prove usability and practicality by implementing the proposed idea using an Aspect-Oriented Programming Language, AspectJ.

• Journal of Korean Society of Transportation
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• v.28 no.1
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• pp.77-86
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• 2010

The study developed physical distribution channel choice models reflecting decision making of the firms and studied how choice decision factors influence selection of distribution channel. The distribution channel survey data in Korea was used to do empirical study. As a choice set, distribution channels were classified into two main choice channels: direct and indirect channels. In addition, indirect channels were classified into other three channels according to the type of intermediate point: distribution center, wholesale store, and agency. This study developed choice models by applying both binary and multinomial logit model with various set of factors. The results showed that the developed logit models seemingly reflect distribution channel choice behaviors. The hypothesis tests on how each factor influences choice of distribution channel were performed and discussed as well.

• Journal of the Korean association of regional geographers
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• v.8 no.3
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• pp.347-363
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• 2002

The purpose of this study is to analyse the formation process and spatial structure of the mountainous village in the historic process as the case study on Yowon-village, Gyeongbuk province. The findings are summarized as the follows. The traditional location of the Yowon mountain village has been strongly influenced by local topology, drinking water, the form and time of the early setters. The spatial structure of the village was changed by the construction of road and accessibility to the road after the introduction of commercial agriculture. The form of the village consists of small scale of concentrated villages and dispersed. villages. Specifically, Yowon 1 ri has been restructured as a small scale of concentrated village and Yowon 2 ri as a dispersed one. The facilities both located in the center of the traditional village and related to communal life were moved outside while those for commercial agriculture were located in the center of the village. In sum, the village had been traditionally life-oriented and closed, but it was production-oriented and open particularly after the introduction of commercial agriculture.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.19 no.5
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• pp.187-194
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• 2019

Traditional demand forecasting methods are difficult to meet the needs of companies due to rapid changes in the market and the diversification of individual consumer needs. In a diversified production environment, the right demand forecast is an important factor for smooth yield management. Many of the existing predictive models commonly used in industry today are limited in function by little. The proposed model is designed to overcome these limitations, taking into account the part where each model performs better individually. In this paper, variables are extracted through Gray Relational analysis suitable for dynamic process analysis, and statistically predicted data is generated that includes characteristics of historical demand data produced through ARIMA forecasts. In combination with the LSTM model, demand forecasts can then be calculated by reflecting the many factors that affect demand forecast through an architecture that is structured to avoid the long-term dependency problems that the neural network model has.

• 한국벤처창업학회:학술대회논문집
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• 2018.11a
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• pp.187-192
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• 2018

현재 급변하는 정보기술, 다양성을 추구하는 시장의 니즈, 미리 예측하지 못한 다양한 형태의 경쟁자 등의 출현으로 인해 경영환경이 급변하고 있는 것은 더 이상 새로운 현상이라고 보기는 어렵다. 이와 같이 급변하는 경영 환경은 기업 간 경쟁 심화를 불러일으키고 있으며, 경쟁 심화는 생존 및 발전을 위해 기업 특성에 맞지 않는 무분별한 전략을 활용하면서 오히려 역효과를 내고 있다는 문제를 야기하고 있다. 특히 변화하고 있는 환경 내 벤처기업 및 창업기업들의 경우 창업 후 생존율이 점차 낮아지면서 일반 기업들에 비해 경쟁력을 갖춘 기업을 찾아보기 어려운 것이 현실이다. 이에 벤처기업들은 도태되지 않고 생존하기 위해경쟁력을 강화시킬 수 있는 다양한 전략을 구사하고 있다. 벤처기업은 하나의 비즈니스 생태계 내 유기적 생명체로서 진화하기 위해 제품이나 산업의 수명주기와 마찬가지로 창업기, 초기 성장기, 고도 성장기, 성숙기, 쇠퇴기 등의 정형화된 단계를 거친다. 따라서 벤처기업은 무차별적인 전략을 통해 기업의 생존 및 성장을 도모 하는 것이 아니라 해당 기업이 놓인 수명주기 단계별로 전략, 조직 구조, 의사결정방식, 통제유형 등을 상이하게 판단하고 이에 적절한 전략을 수행해야 한다. 예를 들어, 동일 생산요소를 투입하더라도 이를 적용할 수 있는 지식이 있는 경우 더 높은 가치 창출이 가능(Aghion & Howitt, 1992) 하지만 창업 초창기의 기업은 고도 성장기의 기업보다 보유한 지식 수준 및 경험이 상대적으로 낮기 때문에 다양한 협력을 필요로 한다. 그러나 현재의 여러 선행연구들은 기업이 처한 상황을 고려하지 않은 단편적인 대처 방안이거나 혹은 부분적인 방법론을 제공하는 수준에 그치고 있다는 한계가 있다(이병헌 외, 2014). 따라서 본 연구에서는 '2016년 벤처기업정밀실태조사' 데이터를 기반으로 기업의 외부 협력 정도 및 벤처기업 지원제도 활용 정도가 경쟁력과 성과에 미치는 영향이 기업의 수명주기별로 상이하다고 보고 관련 전략 프레임워크를 제시하고자 한다.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.33 no.3
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• pp.179-203
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• 2022

This study purposed to measure the economic value of repository services of the National Open Access Platform (AccessON), namely Self Archiving and Journal Repository. The value of Self Archiving was measured by applying time-saving value and the value of Journal Repositories by applying market analogy. Based on existing statistics, in-depth interviews with service beneficiaries and stakeholders, and a survey administered to 1,313 researchers, the value of Self Archiving was estimated to be 145 million won and an additional 12 million won with the OA legalization. The value of Journal Repositories was estimated to be 31.2 billion won. The total value of the repository services was 31.35 billion won over the 8-year business period. This result presented an estimated economic value of a national OA repository from the key beneficiaries' perspectives.

• Composites Research
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• v.34 no.4
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• pp.241-248
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• 2021

As the electric vehicle market grows, there is an issue of light weight vehicles to increase battery efficiency. Therefore, it is going to replace the battery module cover that protects the battery module of electric vehicles with high strength/high heat-resistant polymer composite material which has lighter weight from existing aluminum materials. It also aims to respond to the early electric vehicle market where technology changes quickly by combining 3D printing technology that is advantageous for small production of multiple varieties without restrictions on complex shapes. Based on the composite material mechanics, the critical length of glass fibers in short glass fiber (GF)/polycarbonate (PC) composite materials manufactured through extruder was derived as 453.87 ㎛, and the side feeding method was adopted to improve the residual fiber length from 365.87 ㎛ and to increase a dispersibility. Thus, the optimal properties of tensile strength 135 MPa and Young's modulus 7.8 MPa were implemented as GF/PC composite materials containing 30 wt% of GF. In addition, the filament extrusion conditions (temperature, extrusion speed) were optimized to meet the commercial filament specification of 1.75 mm thickness and 0.05 mm standard deviation. Through manufactured filaments, 3D printing process conditions (temperature, printing speed) were optimized by multi-optimization that minimize porosity, maximize tensile strength, and printing speed to increase the productivity. Through this procedure, tensile strength and elastic modulus were improved 11%, 56% respectively. Also, by post-processing, tensile strength and Young's modulus were improved 5%, 18% respectively. Lastly, using the FEA (finite element analysis) technique, the structure of the battery module cover was optimized to meet the mechanical shock test criteria of the electric vehicle battery module cover (ISO-12405), and it is satisfied the battery cover mechanical shock test while achieving 37% lighter weight compared to aluminum battery module cover. Based on this research, it is expected that 3D printing technology of polymer composite materials can be used in various fields in the future.

• Journal of Digital Convergence
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• v.10 no.5
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• pp.105-116
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• 2012

This thesis is surveying the notions and the countermeasures of the farmers, who produce environmental-friendly crops, on a market and buyers. It ultimately tries to find out ways to increase the sale and the consumption of environmental-friendly crops from the side of the farmers. In chapter 2, analyzing the reality of consuming environmental-friendly crops and consumers inclinations. Also, on the basis of this, in chapter 3, I demonstrate how environmental-friendly producers countermeasures for the consumers are. I try to analyze the trust of the consumer buying environmental-friendly crops, which have been pointed out as a decisive factor for environmental-friendly crops by a lot of researchers, and analyze producers methods dealing with consumers approach to consume environmental-friendly crops. Regarding ways of the reconsideration about the trust, I have shown the problems about the quality authentication, forming consumers trust, and the ways of the consumer management. For the channel and method of the sale I have scrutinized not only a farmers notion about an internet homepage and his or her use but also producers principal sales route, cognition, and correspondence about it. Finally, I have examined the counter plans of the producer to increase sale and to facilitate consumption.

• Proceedings of the Korean Vacuum Society Conference
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• 2015.08a
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• pp.85-85
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• 2015

현재 태양광에너지 시장은 해마다 빠른 속도로 성장하는 추세이며 50 GWp/년 이상의 시장으로 변화하였고 앞으로도 전체적인 성장세는 지속 유지될 것으로 판단된다. 하지만 이와 아울러 각 Value chain 별로 많은 기업들이 생겨나게되어 각각의 기업들이 제품을 고효율 저가화 함으로서 경쟁력을 확보하기 위해 많은 노력들이 기울이고 있으며 본 강연에서는 이러한 측면에서 태양광 에너지의 분야별 고효율/저가화를 위한 기술동향을 살펴보고자 한다. 태양광 산업은 아직은 다소 높은 발전단가로 인해 일부 정부의 지원이나 정책에 의해 산업의 규모가 결정되게 되는데 주요한 지원제도는 RPS 제도와 FIT 제도가 있으며 우리나라는 초기 FIT 제도로 국가에서 태양광에서 생산된 전기를 높은 가격에 사주었으나 근래에들어 RPS 제도를 운영하게 되었으며 매전을 하면서 SMP에 준하는 수익을 창출하고 이와 아울러 REC 를 확보하여 확보된 REC 단가에 의해 추가적인 수익을 창출하는 구조의 발전사업이 진행되고 있다. 그리고 RPS나 FIT와 같은 정부의 지원없이도 발전단가의 경쟁력을 확보하는 시점을 그리드패러티라고 하며 이는 매우 중요한 의미를 갖는다. 태양광의 저가화는 그리드패러티 달성을 확보하기 위해 필수적으로 필요한 사안이며 앞으로도 이러한 저가화 / 고효율화 기술노력은 계속 진행될 것으로 판단된다. 우선 소재의 가격을 줄이기 위해 웨이퍼의 두께가 점점 박형화 되어가고 박형화 되면서도 안정적인 공정수율 및 효율을 향상시키기 위한 기술개발이 진행되고 있으며 Cell 분야에 있어서도 고효율을 위한 다양한 Texturing 기술 및 패시베이션 기술의 개발이 이루어 지고 있으며 고효율 컨셉의 MRT cell, Back contact cell 등 고효율 구조의 cell의 양산을 진행하고 있는 등 최근 n-type 기반의 고효율 cell 기술이 활발하게 양산화 검토가 이루어 지고 있다. 모듈 분야에 있어서는 저가/고효율화와 아울러 제품의 신뢰성 확보가 무엇보다도 중요하게 다루어 지고 있으며 이는 모듈이 최소 25년 이상 Field 에서 운용되어 수익창출이 가능해야 하므로 가장 중요한 요소중에 하나라고 할 수 있다. 신뢰성 측면에서 중요하게 다루어 지고 있는 것 중 하나가 PID 저감을 위한 노력이며 이와 관련된 각 소재의 개발이 가장 활발하게 진행되고 있으며 이와 아울러 장수명을 보장하기 위한 내구성이 겸비된 봉지재의 개발 또한 많은 관심을 불러 일으키고 있다. 저가/고효율화를 위해 CTM loss를 줄이기 위한 다양한 시도가 이루어지고 있으며 특수 형태의 리본으로 빛의 흡수를 증가시키거나 컨택저항을 최소화 하기위한 소재의 개발이 이루어 지고 있다. 태양광 시스템 분야의 경우 발전량과 수익창출에 있어 직접적인 영향을 미치는 분야로서 전체 시스템의 loss 를 줄이고 최적의 환경에서 최대한의 발전량을 확보하기 위한 array 설계 및 운용기술이 활발하게 개발되고 있으며 시스템에서의 loss를 줄여줄수 있는 마이크로 인버터나 multi string 인버터의 적용도 이루어 지고 있으나 저가화를 위한 추가적인 노력이 필요한 상황이다. 본 강연의 마지막으로 이러한 노력들의 산물인 특수 태양광 제품 및 시스템의 기술동향에 대해 살펴하고자 한다. 사막은 전체면적의 1/3을 차지할 정도로 넓은 면적을 자랑하지만 밤과 낮의 기온차 그리고 계통 선로의 부재 등 적용하기 어려운 환경적인 제약도 함께 존재하며 이러한 문제를 해결하기 위한 방안에 대해 살펴보고 최근 Hot issue 중의 하나인 수상 태양광 시스템의 장, 단점과 기술적 특성 등을 살펴보고자 한다.