• Journal of the Korea institute for structural maintenance and inspection
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• v.16 no.3
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• pp.51-59
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• 2012

Through this research safety factors were analyzed for concrete precast panels in road pavement which happens in lifting, moving, and installing. Two half size of full-scale precast concrete panels were made while one full-scale precast concrete panel was made. A series of strain gages for concrete and steel were installed and measured in lifting and transporting. Measurement results indicate that in case of 60 degree of lifting, small scale panel in dynamic motion produces about 3.54 times of strain compared to the static condition. However strain measurement of full-scale concrete panel in lifting and transportation does not yield any big difference compared to the small scale panels in the static condition. From this experimental results safety of the full-scale concrete panel was attained for the lifting system adopted in this research.

• Proceedings of the Technology Innovation Conference
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• 2009.02a
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• pp.605-626
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• 2009

본 연구는 IT산업에서 일반적으로 제품 수명이 짧은 반면, 특허출원부터 등록시 까지 기간이 많이 소요되기 때문에 과연 특허출원하는 것이 실효성이 있을 지에 대한 의구심에서 출발하여 IT산업에서 특허 보유의 필요성이 있는지 여부에 대해 여러 각도에서 집중 분석해 보았다. 본 연구에서는 IT산업에 대한 정의, 국내 IT산업의 세계 시장에서의 위치 및 특허 환경 분석을 통한 분석과 IT산업에서 실제 사용되었던 특허를 사례별로 분석해 봄으로써 전략적으로 특허를 창출하는 방안을 제시하고자 했다. 본 연구결과 우리나라 IT산업의 세계시장에서의 점유율이 높은 부분인 낸드플래시메모리, 평판패널, DRAM, 이동통신 단말 부분에 대한 국내 특허출원 건수를 조사한 바, DRAM, 낸드플래시메모리, 평판패널 그리고 이동통신 단말 순으로 특허출원 건수가 많음을 알 수 있었다. 또한 IT산업의 국내 특허분쟁 사례를 조사한 바, 총산업 대비 41%를 점하고 있다는 사실을 알 수 있었다. 이러한 특허 환경에 대처하기 위해서는 전략적으로 특허를 확보해야 하는 당위성에 입각하여 실제 기업에서 특허분쟁에서 사용되었던 강한특허를 벤치마킹하여 어떻게 특허를 창출해야할 지에 대한 답을 얻고자 했다. 그 결과로 연구개발을 통한 많은 실시 예 확보, 명세서 작성 시 한정적인 용어의 선택을 피하고, 발명의 내용을 확대할 수 있는 특허제도 활용, 마지막으로 의견서 제출 시 균등해석을 제한하는 표현 삼가 등이 전략적으로 특허를 창출하는 핵심 요소로 분석되었다.

• Journal of the Korean Data and Information Science Society
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• v.25 no.4
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• pp.715-725
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• 2014

This study uses a quantile regression analysis to investigate intergenerational economic mobility in Korea. The analysis is based on data from the 1st through 11th waves of the Korean Labor and Income Panel Study (KLIPS) conducted from 1998-2008. The household nature of the data allows us to link parents' incomes to children's incomes at different points in time. Using a quantile regression analysis instead of mean one reveals that the effect of fathers' earnings are different across the conditional distribution of sons' earnings, particularly being larger on the upper quantile than on the lower quantile. After controlling effect of sons' college education by including a dummy variable for the degree, however, the pattern among quantile effects for fathers' earnings is no longer clear. Instead a new pattern emerges that education has a much larger effect on the upper quantiles than on the lower ones. Using nonparametric estimates of conditional density curves based on the quantile regression results, we derive some interesting features in graphical forms, which are not obvious in numerical analysis.

• Journal of Labour Economics
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• v.24 no.1
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• pp.125-147
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• 2001

It is expected that labor mobility and inter-industry labor turnover would rise due to the rapid changes in the industrial structure and legal institutions of layoffs after the 1997 economic crisis in Korea. One aspect of economic costs of labor mobility is demise of accumulated skills of workers. Workers' skills could be decomposed into three parts, general skills, firm-specific skills, and industry-specific skills. Using data from the panal data of Korea Labor Institute(KLIPS), I show that the net return to seniority is markedly reduced once industry-experience are controlled for. The returns to industry-specific experience are relatively high. Particularly, the experience in one-digit industry is more important for the white-collar workers, while the experience in three-digit industry is also important for the blue-collar workers. Therefore, it seems that the economic cost of labor mobility would be diverse between the skills and between the working classes.

• Korean Journal of Social Welfare Studies
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• v.42 no.4
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• pp.137-163
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• 2011

The objective of this study is to examine the trend of real earnings for TANF leavers. Using administrative data in Wisconsin, this study tracks the 1998 TANF leavers over 7 years. Based on the cyclicality of real wage hypothesis, this study finds: First, although the average real quarterly earnings of TANF leavers have remained stable since their exits, there are substantial labor mobility among TANF leavers. Second, the panel data analysis shows that the real earnings of TANF leavers are significantly associated with local labor market conditions, which supports the hypothesis on the cyclicality of real wages. This study has policy implications that labor market conditions matter for the economic well-being of TANF leavers and the labor demand policies are needed for the economic security of TANF leavers after the exit.

• Proceedings of the Korean Vacuum Society Conference
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• 2012.02a
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• pp.290-290
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• 2012

터치패널은 키보드나 마우스와 같은 입력장치를 사용하지 않고, 스크린에 손가락, 펜 등을 접촉하여 입력하는 방식이다. 누구나 쉽게 입력할 수 있는 장점으로 인해 기존에는 현금인출기, 키오스크 등 공공분야에 주로 많이 사용되어 왔으나, 최근의 터치스크린은 휴대폰, 게임기, 네비게이션, 노트북 모니터 등 개인정보기기의 입력장치로 활용분야가 넓어져가고 있다. 기존 터치패널은 유리 기판 위에 ITO박막(투명전도막)을 진공코팅하여 사용하여 왔지만, 최근 터치패널은 경량화를 고려하여 PET 필름 기판 위에 ITO 박막을 진공코팅하여 사용하고 있다. PET 필름의 유연성 때문에 ITO 코팅된 필름을 PC 혹은 강화유리 위에 OCA 물질을 이용하여 다시 고정하여야 한다. 이때 터치패널 제작시 생산공정이 늘어나 생산성이 떨어지고, 터치패널의 광투과율도 떨어지는 2차적인 문제가 발생한다. 이를 해결코자하는 터치페널 업체의 Needs가 있고, 최근에 이를 해결하기 위하여 PC, 강화유리 그리고 COP 기판 위에 ITO 박막을 직접 진공코팅하는 공정개발이 진행되고 있다. ITO 박막은 진공코팅 중에 열을 가하여 결정화를 이루어야 하는데, PC, 강화유리 그리고 COP 기판의 열에 약한 특성을 고려하여, 열을 가하지 않고 ITO 박막을 진공 코팅하여야 한다. 이러한 ITO 박막의 진공코팅 공정에는 In-line magnetron sputtering system이 사용된다. 본 연구에서는 In-line magnetron sputtering system을 사용하여 강화유리 기판위에 정전용량방식 터치패널용 패턴 인비저블 ITO 투명전도막을 제작하고 그 특성을 조사하였다. ITO 박막의 면저항은 230O hm/cm2, 최고 광투과율은 90.96%(@541-543nm), 그리고 550 nm에서 광투과율은 90.45%로 ITO 박막 코팅 전후에 투과율 차이가 0.4임을 확인하였다. 정전용량 방식의 터치패널에서는 ITO 박막 코팅 전후에 투과율 차이가 1 이하의 특성, 즉 패턴 인비저블의 특성을 필요로 하는데, 이는 ITO 박막 패턴후에 패턴이 보이지 않게 하기 위해서이며, 이러한 시장의 Needs를 고려하면 본 연구에서 매우 중요한 연구 성과를 얻었다고 말할 수 있다. 그리고 면저항 기준 150에서 230Ohm/cm2 사이 여러 종류의 ITO 투명전도막을 제작하고 그 특성을 조사하여, 이를 논하고자한다. (본 연구는 지식경제부 사업화연게기술개발 연구지원금으로 일부 이루어졌음).

• Journal of Labour Economics
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• v.24 no.2
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• pp.35-62
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• 2001

Using panel data (KLIPS) we examine the relation between respondents' occupation and their fathers' occupation. We divide the urban employed into four subgroups according to their occupation: employer, self-employed, white collar worker and blue collar worker. We find that the effects of fathers' occupation on respondents' occupation are mediated by the level of respondents' education. The effects of respondents' initial occupation on their current occupation are also significant. In terms of the extent of mobility, we can rank the occupational groups as follows: employer, upper layer of self-employed, white collar worker, lower layer of self-employed and blue collar. In order to encourage occupational mobility, we should level the opportunity of education among different occupational groups.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2015.11a
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• pp.204-205
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• 2015

Demands for free-form buildings are on the rise, but such building designs require most cost and longer construction schedule, with less constructability due to challenges in construction member production and installation. FCP production technology has been developed using CNC machine in a bid to resolve the difficulties of member production. Exterior finishing panels of free-form building design must be divided in size and shape that can be produced by CNC machine. To solve this problem, constraints of CNC machine and correlations between CNC machine and panel need to be reviewed. Thus, the purpose of this study is to analyze decision factors on free-form concrete panel sizes produced by CNC machines. Through this study, FCP size can be optimized, which in turn can lead to improved FCP productivity and aesthetical quality of free-form building designs determined by the pattern of exterior finishing panels. CNC machine-enabled free-form concrete panel production technology will apply on site in the future, which will not only maximize the economic benefits of the technology but also support shorter construction schedule and better constructability.

• Journal of the Society of Disaster Information
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• v.7 no.3
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• pp.198-205
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• 2011

In this paper, an experimental study is performed in order to determine the effects of interaction between vehicle and structure. For this purpose a wheel tracking machine and an adequate precast concrete deck single span bridge are designed. Results presented in the paper show that interaction between vehicle and structure produce additional effects on dynamic behavior of structure including reversal and contrary behavior.

• The Journal of the Convergence on Culture Technology
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• v.8 no.5
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• pp.307-313
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• 2022

In Korea, youth participation in economic activities and unemployment appear at the same time, which is a more serious problem, so a study on the labor market movement can be viewed as a study to overcome youth unemployment. The purpose of this study is to examine how labor movement between the employed and the unemployed is progressing through the survey data of the youth panel among the employment panel and to identify the factors affecting the movement path and movement of the employed and the unemployed. In the case of the employed, they possessed professional qualifications, and in the case of unstable occupational status, they attempted to move to a stable position after being employed. In the case of the unemployed, the probability of failing to find a job was higher as they had no job search experience, the longer the job search period, and the less effort they made. The fact that the home environment directly or indirectly influences the movement of the labor market remains unchanged. On the other hand, the higher the educational level, the more stable, and the most stable the metropolitan area. Therefore, more urgently than ever, a plan to revitalize the local labor market through the organic relationship between the government, local governments, local industry, and local universities and balanced regional development should be sought.