• Journal of the Korean Regional Science Association
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• v.32 no.1
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• pp.27-49
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• 2016

This study examines the effects of real exchange rate (RER) depreciation shocks on firm-level productivity and employment in Daegu-Gyeongbuk manufacturing industries during 2006-2012. In particular, the study focuses on a sharp and persistent RER depreciation of the Korean Won from 2007 to 2009, which is a situation akin to a natural experiment in Korea. We find that RER depreciation has positive effects on productivity for firms with high export exposure in foreign markets. However, these effects disappear when RER depreciation persists. In addition, we do not find evidence that RER depreciation affects employment of Daegu-Gyeongbuk firms significantly. Firms in Daegu-Gyeongbuk region should pursue core competency to obtain international competitiveness rather than depending on temporary better price condition driven by RER depreciation. Further, policy makers in a local government should provide firms with financial and investment support to encourage innovation and R&D.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.32 no.4D
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• pp.367-376
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• 2012

Crack sealing is a maintenance technique commonly used to prevent water and debris penetration and reduce future degradation in pavement. The conventional crack sealing operations are, however, dangerous, costly, and labor-intensive. Automating crack sealing will improve productivity and quality, and offer safety benefits by getting worker off the road. During the last two decades, several teleoperated and machine-vision assisted systems have been developed to automate the overall process of routing and sealing pavement cracks. However, the developed systems have not been commonly used in the construction sites because of the technical problems. Especially, the performance of end-effector, related to the productivity and quality improvement, is very important factor to improve the practical use of the developed systems. The main objective of this research is to develop an end-effector in automated pavement crack sealing machine and to analyze the technical feasibility of the developed end-effector.

• Journal of Digital Convergence
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• v.11 no.3
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• pp.221-232
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• 2013

Setting organization justice and executive characteristics as independent variables, job satisfaction as dependent variable and trust as mediating variable for small and medium enterprise, this study intended to corroboratively identify the mutual impact between independent variables and dependent variables. The study shows that the distribution justice, procedure justice and interaction justice of organization justice wholly have positive(+) impact on job satisfaction and leadership characteristics, impact characteristics and psychological characteristics of executive characteristics wholly have positive(+) impact on job satisfaction, thereby having mediating effects through trust perceived by employees. Namely, if the job efficiency and moment is enhanced by increasing employees' job satisfaction, the productivity of enterprise will be heightened after all and its profitability will be improved in the long run.

• Proceedings of the Korea Contents Association Conference
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• 2015.05a
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• pp.137-138
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• 2015

한국사회는 빠르게 저출산 고령화가 진행되고 있으며 이에 따라 생산가능인구가 감소하고 있는 실정이다. 국가 경쟁력 제고 차원의 새로운 대안으로 다양한 인력 활용 방안을 고려하게 되었다. 이를 적극적이고 효과적으로 지원하기 위하여 정책이 필요하며, 정책과정에 자원으로 정책지식이 동원된다. 정책지식이 생성되고 활용되는 전 과정에 참여하는 개체들을 분석하여 정책지식 생태계 모형으로 나타낼 수 있다. 본 연구에서는 효과적으로 다양한 인력을 관리하기 위해 정책지식생태계 관점에서, 즉 정책지식을 둘러싼 미시체계, 중간체계, 외체계, 거시체계 차원에서 정책지식과 관련된 이슈를 논의하였다.

• Elastomers and Composites
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• v.52 no.2
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• pp.114-130
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• 2017

Enhancing the properties of rubber, such as the tensile strength, modulus, and wear abrasion, by the addition of carbon black and silica as fillers is very important for improving the performance of rubber products. In this review, we summarize the general features of 'the reinforcement of rubber by fillers' and the equations for representing the reinforcement phenomena. The rubber reinforcement was attributed to enhancement of the following: the rubber, bound rubber, formation of networks, and combination between rubber chains and silica followed by entanglement. The reinforcement capability of silica species with different surface and networked states demonstrated the importance of the connection between the silica particles and the rubber chains in achieving high reinforcement. The model involving combination followed by entanglement can provide a plausible explanation of the reinforcement of rubber by carbon black and silica because the combination facilitates the concentration of rubber chains near the filler particles, and entanglement of the rubber chains around the filler particles enforces the resistance against deformation and breakage of rubber compounds, resulting in high reinforcement.

• 한국경영정보학회:학술대회논문집
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• 2008.06a
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• pp.563-570
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• 2008

PDM(Product Data Management)은 제품의 개념정의에서부터 연구개발, 생산, 서비스에 이르는 전 과정에 걸쳐 관련된 모든 제품 정보를 협업을 통해 생성, 관리, 사용하도록 지원하는 일련의 프로세스를 의미한다. PDM 시스템 구축의 일차적 목적은 제품 관련 데이터의 정합성을 확보하여 데이터 관리의 효율성을 제고하고, 업무프로세스의 개선 및 표준화로 부가가치 창출에 기여하는 것이다. 특히 제품의 연구 개발 프로세스 전반에 걸친 제품정보의 공유를 통해 연구개발 부서와 기타 업무부서간 협업적 업무 프로세스의 구축을 촉진함으로써 R&D 경쟁력 확보에 기여할 수 있다. 본 연구에서는 의료기기 제조업체의 PDM 구축사례를 소개함으로써 R&D 경쟁력 확보를 위한 PDM의 효용성에 대해 논의하고자 한다. 본 연구의 사례에서는 PDM 시스템 구축을 통해 BOM 관리, 도면 및 설계변경 관리, 문서 관리 등에 소요되는 시간의 $30\sim70%$ 가량을 단축하였으며, 연간 $3\sim5%$ 가량의 재료비 절감이라는 효과를 거두었다. 본 사례연구의 결과가 PDM 도입 시 실질적인 지침을 수립하는데 도움이 될 뿐만 아니라 효과적인 PDM 구축절차 수립에 기여할 것으로 기대한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2010.11a
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• pp.447-450
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• 2010

IT 기술의 혁신과 저변 확대로 모든 조직들이 정보시스템 구축을 통해 업무의 성과창출 및 생산성 제고 등의 효과를 거두고 있으며, 이에 정보시스템의 규모는 점점 방대해지고 투자비용은 지속적으로 증대하고 있다. 상대적으로 정보시스템에 대한 유지 관리 부문의 비용도 급증하고 효율성 측면에서도 문제가 되고 있는 실정이다. 이에 본 연구는 특정기관의 정보시스템 유지 관리 부문 중에서도 특히 아웃소싱에 대한 문제점과 비효율성을 진단하고 개선점을 도출하여 효율화 방안을 제시하였다.

• Korean journal of applied entomology
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• v.48 no.3
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• pp.385-392
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• 2009

Two entomopathogenic bacteria, Xenorhabdus nematophila and Photorhabdus temperata subsp. temperata, are known to be potent against the diamondback moth, Plutella xylostella, when the bacteria are injected into the hemocoel. This study investigated any pathogenic effect of their culture broth on P. xylostella by oral administration. Only culture broth of both bacterial species did not give enough pathogenic effects by the oral administration. However, when the culture broth was orally treated together with Bacillus thuringiensis (Bt), both cell-free culture broth significantly enhanced Bt pathogenicity against the 3rd instar larvae of P. xylostella. The culture broth was then fractionated into hexane, ethyl acetate, and aqueous extracts. Most synergistic effect on Bt pathogenicity was found in ethyl acetate extracts of both bacterial species. Thin layer chromatography of these extracts clearly showed that ethyl acetate extracts of both bacterial culture broths possessed metabolites that were different to those of hexane and aqueous extracts. These results suggest that the both entomopathogenic bacteria produce and secrete different factors to give significant synergistic effect on Bt pathogenicity.

• Journal of the Economic Geographical Society of Korea
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• v.21 no.2
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• pp.77-89
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• 2018

The purpose of this paper is to analyze the industrial linkage between manufacturing and service industries in Seoul and Busan. In this paper, the industrial linkage between the manufacturing and the service industry is analyzed through input-output coefficient and production inducement coefficient. The results are as follows. First, the linkage of the service industry to the manufacturing in Seoul was higher than that of Busan. Second, Busan had a low input proportion of the service industry supplied by its own area to the manufacturing, so that the effect of the growth of Busan manufacturing on the regional economy is limited. Third, the linkage of manufacturing to service industry in Busan was found to be higher than that of Seoul. Finally, policy directions for improving the industrial linkage between manufacturing and service industries were suggested based on the results.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• autumn
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• pp.341-344
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• 2003

There are many problems in management of high-rise building construction performed in downtown area due to limited spaces and equipments for increasing kinds and quantities of material. By these restrictions, problems such as increase of construction cost. delay of construction period, decrease of productivity, occurrence of accident are caused. Recently, studies on JIT concept have focused on construction materials as a solution for the problems. But, studies about finishing material are insufficient yet. Accordingly, this study suggests flowing of current material management, JIT management effect, and development direction of lifting-up and procurement system with Low-emissivity double Glazing, among of main finishing materials.