• 통상정보연구
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• 제14권2호
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• pp.271-293
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• 2012

서비스 산업의 중요성이 높아짐에 따라 경제에 있어서 서비스의 역할에 대한 연구도 활발하게 이루어지고 있다. 이러한 연구는 주로 경제의 서비스화와 일국의 생산성의 관계를 중심으로 연구되었다. Baumol(1967)은 경제의 서비스화는 일반적으로 생산성 저하 현상을 야기할 것이라는 우려를 제시했으나 선진국의 경우 생산성이 오히려 상승하는 Baumol의 역설 현상이 발생하였다. Oulton(1999, 2001)은 이러한 현상의 이유로 하나의 산업에서의 생산이 타 산업으로부터 중간재를 공급받아 생산되는 연쇄과정인 전후방연관효과에서 찾고 있다. 따라서 본 연구에서는 OECD 국가를 대상으로 Oulton(1999, 2001)의 이론을 실증적으로 검증해 볼 필요성이 있다고 판단하였다. 연구 결과, Oulton(1999, 2001)의 이론과 같이 서비스의 중간투입 비중이 상승하면 다요소생산성(Multifactor Productivity)이 상승하였다. 특히 일반서비스와 달리 지식집약적 서비스가 중간재로 투입될 경우 일국의 생산성 향상을 가져오는 것으로 나타났다.

• KDI Journal of Economic Policy
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• 제44권3호
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• pp.75-99
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• 2022

This paper analyzes job creation when the Korean economy transitioned to a knowledge economy from the 1990s to the 2010s. During this period, the ratio of service to manufacturing jobs increased, knowledge intensive industries grew, and job creation became geographically concentrated around Seoul. The changes slowed down in the 2010s, and overall job growth weakened. To analyze the effect of job creation driver industries during this period, the main part of which are knowledge intensive tradable service industries, on local service job creation, I use a modified version of the local labor market of Moretti (2010). I analyze the job changes during 1995-2005 and during 2006-2016 in 237 Si-Gun-Gu areas in the Census on Establishments datasets. I find that one manufacturing job creates 0.5 local service jobs and that one tradable service job creates 1.1 jobs within Gu areas of metro cities and 2.3 jobs in Si-Gun areas. The job creation relationship between the tradable and local service sectors was not altered in this period. As more jobs were created in the tradable sector driven by the transition to a knowledge economy, job creation overall remained active, with the opposite also being true.

• 한국산업정보학회논문지
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• 제5권4호
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• pp.39-46
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• 2000

New products often have in-service reliability problem despite an intensive development program. Therefore reliability data must be collected and analyzed, and improvements designed and implemented. A type of reliability incentive contract which has recently attracted a lot of attention is reliability improvement warranty(RIW). It has been employed by military, airlines, telecommunication systems, and public utilities. An RIW contract requires that the supplies carries out all repairs, modify the equipment to improve its reliability, and provides all spates needed, for a fixed period, for once-off fee. This paper presents the reliability growth analysis and management methods for in-service MC68 microprocessor, which is the main component of the base station controller in PCS(Personal Communication Service) telecommunication system. The methods will provide guidelines to monitor reliability program in planning RIW contract.

• 국제지역연구
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• 제15권2호
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• pp.125-150
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• 2011

경제가 선진화 되면서 나타나는 경제의 서비스화는 일반적으로 생산성 저하 현상을 야기할 것이라는 우려가 있다. 그러나 선진국의 경우 경제의 서비스화 현상이 진행되면서 생산성이 오히려 상승하는 Baumol의 역설 현상이 발생하였다. Oulton(1999, 2001)은 이러한 현상의 이유로 하나의 산업에서의 생산이 타 산업으로부터 중간재를 공급받아 생산되는 연쇄과정인 전후방연관효과에서 찾고 있다. 따라서 본 연구에서는 Oulton(1999, 2001)의 이론을 실증적으로 검증해 볼 필요성이 있다고 판단하였다. 또한 더미변수를 이용하여 소비자 서비스와 생산자 서비스의 중간 투입 간의 영향력 차이를 파악하고자 하였다. 위의 연구 목적을 달성하기 위해 한국은행에서 발간되는 산업연관표(1990, 1995, 2000, 2005)의 자료로 멀티레벨모형(Multi-level Model)을 활용하여 이론 검증을 실시하였다. 연구 결과, Oulton(1999, 2001)의 이론과 같이 한국의 경우에 중간재 생산자 서비스의 투입 비중이 상승하면 다요소생산성(Multifactor Productivity)이 상승하였다. 또한 중간재 생산자 서비스의 비중 변화와 달리 중간재 소비자 서비스의 비중 변화는 다요소생산성에 유의한 영향을 유발하지 않았다. 주요 산업(서비스업, 제조업, 그 외 산업)별로 중간재 생산자 서비스의 비중 변화의 효과 차이를 검증한 결과 제조업이 서비스업과 그 외의 기타산업에 비해 중간재 생산자 서비스의 비중 변화의 효과가 더 작았다.

• ALGAE
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• 제33권1호
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• pp.109-125
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• 2018

Turkish towel (Chondracanthus exasperatus), Pacific dulse (Palmaria mollis, also known as Red ribbon seaweed), and sea lettuce (Ulva spp.) were cultivated in a land-based intensive culture system at the Manchester Research Station, USA from August 2013 to September 2014. Macroalgae were grown in tumble-aerated tanks, harvested bimonthly for seasonal growth calculations, and analyzed for protein, lipid, ash, and amino acid content. Growth rate of all three species exhibited a similar pattern, with the highest specific growth rates occurring during the summer months (Turkish towel: 7.8%, Pacific dulse: 8.2%, and sea lettuce: 6.2%). Growth of all three species was lowest around winter solstice; with negative growth only observed in sea lettuce. On a dry weight basis significant differences in protein content existed between the three species with highest values for sea lettuce ($29.5{\pm}1.4%$). Lipid content varied between species (0.95-2.78%) with significantly higher lipid observed in sea lettuce (0.58-4.82%). No significant differences were detected on a seasonal basis among each species. Essential amino acids accounted for $43{\pm}0.9$ to $47{\pm}1.2%$ of total amino acids with Turkish towel having the highest value. Turkish towel had a significantly higher taurine level ($0.82{\pm}0.27$) than the other macroalgae. The levels of persistent organic pollutants and heavy metals were low. The estimated annual product of the three species ranged from 50- to $70-mt\;dry\;weight\;ha^{-1}\;y^{-1}$, significantly higher than conventional crops. Land-based culture of these species can produce year-round harvest, consistent product quality, and low contaminant levels.

• 한국정보시스템학회:학술대회논문집
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• 한국정보시스템학회 2003년도 춘계학술대회
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• pp.169-181
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• 2003

As growth of the web-based applications, the requirements of the users who have been very familiar to the web-based user interfaces and customer-oriented services on the Internet would become more knowledge-intensive and higher technology involved in a more convenient and polite way of service delivery. Therefore, the service quality of information system department should be considered as a very important factor influencing success of information systems. The objective of this study is to provide the relationship between service quality of IS department and its impacts such as use, user satisfaction and job performance. For this purpose, we provide a research model for it and test it empirically for the users of the corporate portal in one of main telecommunication service providers in Korea. In result, our model with satisfiable validity and reliability shows not only importance of IS departments' service quality but also two-faced characteristics of service quality. That is, while technical competence which means with knowledge and expertise of IS department staffs is more related with user satisfaction on information systems, personal service which means the way and manner of service delivery is more related with use of it.

• 한국지역지리학회지
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• 제18권3호
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• pp.283-297
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• 2012

본 연구의 목적은 클러스터 생애주기 분석을 기반으로 서울디지털산업단지의 진화 경로와 역동성을 분석하는 것이다. 1960년대 중반부터 1990년대 후반까지 업체수와 고용자수 변화를 중심으로 구로공단의 발생-성장-유지-쇠퇴의 생애주기를 구분하고 시기별 특성을 분석하였다. 1990년대 후반 이후 업체수와 고용자수가 급증하였고, 소규모 기술집약 중소기업과 지식기반 서비스기업이 서울디지털산업단지의 성장과 구조재편을 주도하였다. 이것은 지식산업센터(아파트형공장) 증가로 가능했으며, 2000년대 중반 이후에는 지식기반 클러스터로의 변환의 생애주기 모습을 보여준다.

• 지역연구
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• 제6권2호
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• pp.123-147
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• 1990

This paper examines the changing geography of producer service industries in the 1980s. The foci of this study are to analyze the regional distribution of each producer services, and to reveal the spatial linkage of producer services. Further this paper asserts the potential role of producer services for reducing the potential endogenous development in the periphery. During the 1981-86 period, producer service industries grew more rapidly than other service sectors and manufacturing sector. The main reason of the raid growth of producer services is attributable to an increase in demand for intermediate services from manufacturing firms. In order to compete an increasingly complex business environment, firms have expanded the amount of effort devoted to activities such as planning, coordination and control, and consequently have increased their use of producer services. The most distinctive feature of the location of producer services is spatial concentration into Seoul and surrounding region. Especially the degree of the concentration o business services into the Capital Region has been accelerating during the 1990s. The pattern of employment growth and regional distribution of producer services show a clear core / periphery disparity. Much of the regional inequality in producer services is largely due to variation in demand associated with the pattern of corporation headquarters with the pattern of corporation headquarters and branch plants location with large manufacturing firms. The analysis of spatial division of labor reflects that producer services are related to the location of headquarters in manufacturing industry. Headquarters in manufacturing firms and business service firms tend to cluster each other. Most of the headquarters spatially separated from branch offices are clustered heavily in Seoul. Especially headquarters of business services and insurance services are overwhelmingly concentrated into Seoul. The firms whose headquarters are located in Seoul have a linkage pattern on a nationwide scale. It is viewed have little potential for generating local multiplier effects and regional development. In the light of the result of this study, producer services are not likely to disperse soon to peripheral regions. Consequently the absence of policies directed at enhancing producer sevice in the periphery, concentration tendency would continue to reinforce the core's dominance at the expense of peripheral regions. From a regional perspective, the quality of a region's producer service sector is a key determinant of economic growth, since manu industrial location decisions are influenced by the differential availability of producer services among regions. Poor performance of producer services in peripheral regions seemed to be linked to the region's manufacturing base. Low-wage, standardized branch plants are not likely to induce the growth in knowledge intensive services associated with high-technology corporate headquarters. Producer services may help to create and attract new business including manufacturing firms, and also to enhance the productivity and competitiveness of local firms. Therefore the provision of service producing activities would be lead not only to generate and retain endogenous development but also to attract external firms, especially small and medium sized firms which have a lower propensity of internalized services. Hence, it may be more efficient to create and expanse new locally owned producer services rather than to attract branch plants of mult-locational firms in order to make indigenous economic development.

• 한국안전학회지
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• 제10권2호
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• pp.120-128
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• 1995

The fatigue failure of rail is a principal source of derailment accidents. The reduction of fatigue failures can be achieved by Intensive track maintenance and periodic safety assessments for the railway. For the safety assessments, it is required to have more accurate knowledge for fatigue behavior such as the crack initiation, propagation, crack growth rate and the remaining service life in rail. In this paper, the mean stress effects for the fatigue behavior of rail steel are studied. For this study, the fatigue test is conducted and some equations for fatigue evaluation are applied and compared. From the results, we can see that the fatigue crack growth rate is the more increased as the men stress Is the more increased, the mean stress effect is represented well by the combination of stress intensity factor range and maximum stress intensity factor and Crooker and Range's equation represented by ${\Delta}K, K_{max}$ is the best fit for fatigue evaluation and safety assessment of rail.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집 특별세미나,특별/일반세션
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• pp.165-170
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• 2009

The Korean high-speed rail network has been made a remarkable growth recording the world's 4th rank passenger transportation scale during last 5 years after opening the revenue service of Kyoung-bu high-speed line in 2004. However, in spite of it's outstanding growth, Korean Rail technology should meet a demand of intensive technology development in order to prepare a severe competition with an advance parties of worldwide high-speed rail technology. In this paper, the characteristics and new trend of world's rail industry was reviewed based on the most recent statistics and papers of worldwide rail network from UIC and WCR32008. In conclusion, new R&D strategy with choice an concentration for the Korean high-speed rail industry was suggested based on an analysis on the trend of evolution of the state of the art technologies in worldwide high-speed rail system.