• 대한교통학회지
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• 제23권2호
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• pp.83-92
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• 2005

OECD 국가들 중 국토계수가 우리나라의 50%(1/2)~200%(2배)인 4개국의 1인당 GDP 10,000달러 도달시기의 국토계수당 도로보급률을 비교하면, 우리나라의 유효도록보급률은 평지대비 약 58.9% 수준, 총면적대비 약 63.4% 수준인 것으로 분석되었다. 철도도 동일한 방법으로 우리나라의 철도스톡규모가 이들 국가의 평지 면적 대비 약 41.3%, 전체 면적 대비 약 53.2% 수준으로 분석되었다. 또한 이들 나라의 평균 유효도로연정과 유효철도연장을 목표 도로 및 철도스톡으로 정의하고 목표스톡에 도달하기 위한 각년도 목표주자금액을 산정하였는데, 2000년 실질가격 기준으로 도로와 철도는 매년 약 15조 2천억 원 및 약 6조 5천억 원을 투자하여야 하는 것으로 분석되었다. 이를 실제 투자금액과 비교하면 철도는 실제 투자금액이 목표투자금액에 미달하여 향후 철도투자를 증가시킬 필요성이 제기되었다.

• 한국도로학회논문집
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• 제15권3호
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• pp.137-149
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• 2013

PURPOSES: This study is to suggest the Contribution of Road Capital in Industry and Optimal Level of Road Investment in South Korea METHODS: Based on the literature review, This research is empirically estimated using disaggregate and disaggregated data composed of 10-sectors covering the entire korea economy for the period 1970~2000. The relevant policy questions addressed in this report are : cost reduction and Scale elasticities of road, effect of road capital stock on demand for labor, capital and materials, marginal effect of road, industry TFP growth decomposition, Net Social Rates of Returns, optimal of road capital. RESULTS : The marginal benefits of the road capital at the industry level were calculated using the estimated cost elasticities. Demand for the road capital services varies across industries as do the marginal effects. The marginal benefits are positive for the principal industries. This suggests that for these industries the existing stock of road capital may be under supplied. CONCLUSIONS: This results emerges is that the ratio of the optimum to actual road capital, measured by road, was high at beginning of the period 1970s and declined 1990s. There appears to be evidence of under-investment in road capital. That is continuous and premeditated investment for road which lead to saving time and finance.

• 통상정보연구
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• 제7권4호
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• pp.325-349
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• 2005

One aspect of the globalization of the financial market after the 1980s is represented by the concurrent monetarization of the national stock markets. As the IR activity is regarded as a new financial productivity measure, the IR activity in the stock market is being emphasized domestically and internationally. This study analyzes domestic IR activities and compares them with foreign IR activities. Specifically the "road show", a typical IR activity, which is known to resolve the information asymmetry between the firm and the investors is analyzed to see the extent of the their value increase impact on the firm. The study employs domestic and international firms that publicly announced "road shows" after April 2004. Event studies are done to see the existence of abnormal return after the public announcement of road shows. Domestic firms were found to have positive IR impacts on the stock prices, but international firms were found to have negative IR impacts on the stock prices. Also it was found that international public announcement of the road show have stronger positive impact on the stock price than domestic public announcement. The investigation of the statistically significant difference of CAR before and after the fair public announcement enforcement rule showed that the positive CAR impact is strengthened after the adoption of the rule. The conclusion is that increase of the firm value after the road show implies that the information asymmetry is reduced by the active IR actions on the firm side. The policy implication is that we have to reassure the understanding of the role of the IR activities. Specifically Korean firms may have to encourage IR activities to share the information of the firms with the investors, which may result in the trustworthy relationship between the firms and investors.

• 한국도로학회논문집
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• 제15권2호
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• pp.169-181
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• 2013

PURPOSES : This study is to suggest the Influence of road capital to industry and productivity growth in South Korea. METHODS : Based on the literature review, The relevant policy questions addressed in this report are : cost reduction and Scale elasticities of road, effect of road capital stock on demand for labor, capital and materials, marginal effect of road, industry TFP growth decomposition. RESULTS : The marginal benefits of the road capital at the industry level were calculated using the estimated cost elasticities. Demand for the road capital services varies across industries as do the marginal effects. The marginal benefits are positive for the principal industries. This suggests that for these industries the existing stock of road capital may be under supplied. The contribution of road capital to TFP growth is positive in principal industries. The main contribution of road capital is in the manufacturing industries ; the magnitudes of contribution varies among industries. These results indicate that growth in exogenous demand is most important contributor to TFP growth. CONCLUSIONS : The road capital have a significant effect on employment, private capital and demand for materials inputs in all industries. At a given level of output, an increase in road capital lead to variety to demand for all inputs in all industries.

• 한국전자통신학회논문지
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• 제7권3호
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• pp.661-670
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• 2012

명료하면서도 수익이 나는 주식투자기법을 만들기 위해서는 투자수익 발생구조와 투자자의 상황, 그리고 주식시장의 장세가 통합적으로 고려되어야 한다. 그러나 통합적 이해 과정은 주식투자자들로 하여금 오랜 시간과 많은 비용을 요구하게 된다. 본 논문에서는 주식투자자가 자기 상황에 적합한 주식투자모델을 완성하는데 소요되는 시간과 비용을 절감할 수 있도록 주식투자 고려요소들을 분류하고, 그 요소들을 통합해 가는 과정을 로드맵화 하였다.

• 대한토목학회논문집
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• 제29권3D호
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• pp.357-362
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• 2009

최근 국내 도로 사업은 예산투자 및 시설규모가 적정수준에 도달하였거나 또는 중복 과잉 투자되고 있다는 논란이 증가함에 따라 도로의 추가적인 건설에 대한 부정적 인식이 확산되고 있는 실정이다. 실제로 최근 도로부문에 대한 2003년 약 9조 원이 투자된 이후로 지속적으로 감소하여 2007년 약 7조 3천억 원 수준으로 감소하고 있다. 도로시설이란 각 산업부문과 국민경제에 큰 영향을 끼치는 중요한 생산요소이며, 이에 대한 투자는 경제 성장에 있어 필수불가결한 요소이다. 따라서 효율적인 투자를 위해 적정 도로시설 규모를 산정하는 것은 매우 중요하다. 본 논문에서는 도로보급률 관련 기존 지표와 추가 지표를 제안한 후 OECD국가들 중 적합한 비교 대상(국토계수가 유사)을 선정하여 우리나라의 도로스톡 수준을 비교분석하였다. 또한 소득수준이 GDP 2만 달러(2007년 기준)에 도달함에 따라 향후 3만 달러, 4만 달러 도달 시 목표 스톡량을 확보하기 위한 우리나라 도로시설의 규모를 선정하였다. 정교한 이론이 부재한 상황에서, 국토면적, 자동차보급대수, 인구, 소득수준 등을 활용하여 국가간 도로보급률을 비교분석하는 것은 우리나라의 현 수준을 진단하고 미래 목표를 설정하는데 있어서 실용가치가 매우 높다고 하겠다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 춘계학술대회 논문집
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• pp.1301-1307
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• 2008

The Seoul-Metro is the first city railroad corporation to operate RIMS(Rolling-stock Information Maintenance System). The development of "RIMS Project" and trial running task were started from Mar 29, 2001. Finally, this project was completed successfully on Dec 31, 2005, as integrated systems including light or heavy maintenance works in Ji-Chuk and Chang-Dong Rolling-stock Offices. After that, from 2006 to Dec 31, 2007, we promoted a this new program to other four rolling-stock offices (Su-Seo, Gun-Ja, Sin-Jeong) and the headquarter. For the duration of trial running, we developed and applied new complementary program having made up for the weak points or defects. The series of new program which were newly developed and applied are comprised of an operation management, trouble management, wheel management, heavy maintenance table automatic creation programs and ordering prediction programs to purchase goods smoothly. The Seoul-Metro have registered these programs(RIMS) to Computer Program Protection Committee. We'd like to introduce a composition of program for enhancement of a city railroad Information Systems.

• 한국정밀공학회지
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• 제24권5호
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• pp.56-61
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• 2007

In the braking of railway rolling stock, the slip that is the relative velocity between train body and its wheel affects the adhesive force which is connected to the braking force. The coefficient of the adhesive force changes in accordance with the slip and the condition of a rail road. Namely, its value increases upon the maximum on a rail condition, and there it declines conversely while the magnitude of slip keeps rising on. First, this paper introduced a reference slip generator so that can utilize maximum adhesive forces with a disturbance observer for estimating unmeasurable current adhesive forces which is as an input of the generator. And, an adaptive sliding-mode control system has been synthesized for minimizing the error between reference and current slip. Finally the effectiveness of the proposed control system is evaluated by computer simulation.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.1817-1823
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• 2007

In this study, we have studied rail infrastructure related to emergency action to manage the risk when emergency caused by faults of facility or rail vehicle during operation happens. Especially we have compared the effect of emergency action with examining the structure of vehicle, tunnel, bridge and access road, etc which are related to emergency action. Also, we have tried to analyze effects of radio and communication equipment, lifesaving and refuge which could be used for rolling stock, station, control room, tunnel, bridge and etc, and we have presented the way of reporting the emergency to the train driver or crew, control room, outside networks which could be used by passengers in vehicle, station, railroad line. Based on these, we have analyzed the conduct of emergency action in length of time when emergency happens in railway and high-speed railway, and studied the method of which passengers could be guided safely and escape from the scene of the accident.

• 한국펄프종이공학회:학술대회논문집
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• 한국펄프종이공학회 1999년도 Proceedings of Pre-symposium of the 10th ISWPC
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• pp.9-18
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• 1999

Recycling systems are usually designed with pulp quality targets based on cleanliness, or similar property. Achieving other specific fibre properties is rarely a goal of a recycling system, but fibre properties can be modified to suit specific end uses. Recycling line equipment choices impact n fibre properties, but these effects choices impact on fibre properties, but these effects tend to be less well documented than the effects on cleanliness or brightness.