• Proceedings of the KSR Conference
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• 2002.05a
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• pp.561-566
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• 2002

As the air pollution caused by diesel vehicles goes worse, so non-road vehicles exhaust gas standards are more strict in an foreign countries. There is growing evidence that diesel vehicles could play the important role in determining health effects. Most of the particle number emitted by diesel engines is in the nanopaticle range, D$\_$p/ < 50nm, while most of the mass is in the accumulation mode, 50nm < D$\_$p/ < 1000nm range. The aim of this work was to investigate pollutants in the exhaust of railroad diesel rolling stock under load tests.

• Transactions of the Korean Society of Automotive Engineers
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• v.22 no.5
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• pp.50-58
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• 2014

The PRT(Personal Rapid Transit) system is highly interested to meet a need for demand-responsive transport service and increasing demands of traffic in Korea recently. And it is being spotlighted as an eco-friendly transportation system. For these reasons, researches on the PRT system are actively undergoing in Korea. In this study, we evaluated the static structural and fatigue strengths based on ASCE-APM standards and ERRI B 12/RP 17 by means of FE simulation. We also evaluate the running stability by multi-body dynamic analyses and the rollover safety by a theoretical static stability factor according to the road modeling scenarios for the PRT system. From the results of this study, we confirmed the durability and running stability of the Korean PRT under development.

• Journal of Korean Society of Forest Science
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• v.87 no.2
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• pp.239-252
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• 1998

Based on forestry inventory data and various informations, this study was conducted to analyze the silvicultural activities by distance classes from forest road and to evaluate their effects in the area of Mt. Gari managed by Chunchon Regional Office of Northern Forest Management Office. The results were summarized as follows; 1) Most harvesting practice(67.9%) was done within 500m from forest roads, in the order of Pumgul, Saorang, and Kongkol forest road. And thinning practice was not related to the distance from forest road, produced $440.6m^3$, 35.7% of total thinning volume within 1,000m width along the forest roads. 2) Planting of 530,461 seedlings, 66.8% of total planting stock, in 176.9ha, 66.6% of total area within 1,000m from forest road, and supplementary planting of 46,243 seedlings was done in 15.4ha, 42.9% of total area within 500m from forest road. Areas and numbers of seedlings of two planting practices were in the order of Pumgul and Byungatur forest road. 3) Tending operation was done in 330.0ha, 60.3% of total area within 500m from forest road, and pre-commercial thinning was done in 693.6ha, 71.2% of total area. Areas of intermediate cutting practices were in the order of Pumgul, Korkol, and Saorang forest road.

• Journal of agriculture & life science
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• v.45 no.3
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• pp.35-41
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• 2011

The objective of this study was to estimate domestic potential wood supply according to geographical and forest management conditions. In order to separate available wood supply area, analysis was conducted by separating natural, theoretical, geographical and technical supply area. Natural supply area was separated by extract stocked land from forest using digital stock map. Theoretical, geographical and technical supply area was separated by considering protection area, slope, streamside and road. Growing stock was calculated by using species and age-class of digital stock map. Potential wood supply was estimated by calculating growing stock of technical supply area. The results of growing stock of each supply area was shown that growing stock was from 244,150 to 596,248 thousand $m^3$. According to the results of this study, it was found that potential wood supply are likely to be over- or underestimated depending on the considered level of geographical and forest management conditions. Provincial potential wood supply was highly ranked in order of Gyeongbuk, jeonnam, Gyeongnam and Gangwon province.

• Journal of Korean Society of Transportation
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• v.20 no.6
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• pp.45-56
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• 2002

In this research we estimated regional gross fixed capital stock of transport sector, such as road railroad, airport and seaport during 1968-1997 in Korea. We also compared our estimation results with those of Korea and Japan. As basic analytic method, we used the regional allocation method. To estimate regional gross fixed capital stock of transport sector, we used the basic data on national wealth surveys in 1997, regional land price index and regional facilities index in transport sectors. We used the most reasonable data in the process of estimation after reviewing the collected data In order to get the reasonable capital stock by regions. we chose the allocation index which can minimize the difference between the estimated result and the real regional capital stock in the process to allocate the total gross capital into the regions. Compared our results with those of other researches in Korea, estimates in our research project could be said more accurate than those.

• The Journal of the Convergence on Culture Technology
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• v.2 no.4
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• pp.49-54
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• 2016

Development of AR/VR has expanded computer games from indoor static contents to outdoor dynamic contents. The syndrome of 'Pokemon Go' which is a representative AR game was born, and Nintendo's stock price shot up a massive 120%. Although some people gained profits, new damages are emerging including illegal intrusion or road accidents because it is a type of game to visit real locations. There are reported about 114 thousand road accidents related to the game. This study aims to examine the trends of AR game in 2016 and analyze damages and positive cases to suggest a method for preventing accidents due to the AR game, and a business model.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.6 no.3
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• pp.174-182
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• 2007

There are not many studies on the maintenance and replacement for the ITS equipments. Most of ITS center has no comprehensive regulation on the equipment replacement. This study was focusing on estimation of equipment replacement period and the number of spare parts in stock using the actual failure data of Road Side Equipment (RSE) by Dedicated Short Range Communication (DSRC). The failure data showed a type of bath-tub curves. The data, however, did not fit to any probability distribution curve, which means that the preventive replacement cannot be strongly applied for the RSE. In the aspect of practical strategy, this study suggest that repairing cost and failure frequency be used for decision of replacement of RSE after the 1 or 2 year warrant period. The future study needs to include more RSE failure data as well as other equipments of the ITS.

• Journal of Korean Society of Transportation
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• v.19 no.5
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• pp.35-45
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• 2001

In this research, we estimated annual gross fixed capital stock of transport sector, such as road, railroad, airport and seaport during 1968-1997 in Korea. As basic analytic method, we used the polynomial benchmark method. The polynomial benchmark method requires capital stock estimates of at least two benchmark-years and is distinguished from other methods in the fact that retirement rate can be estimated within the model. To estimate gross fixed capital stock of transport sector. we used the basic data on national wealth surveys in 1968, 1977, 1987 and 1997. and investment data of each transport sector during 1968-1997. We used the most reasonable data in the process of estimation after reviewing the collected data. In estimating, some retirement rates were estimated at (-) value, so we have applied various method to fix up the problem. At last, we have reported several estimation results which can be considered as reasonable ones. Compared our results with those of other researches in Korea, estimates in our research project could be said more accurate than those.

• Proceedings of the KSR Conference
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• 2011.05a
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• pp.1388-1398
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• 2011

Air pollution in subway tunnel is primarily caused from the wear of metallic materials. As undesirable substance, PM(Particulate Matter) can especially harm the health of passengers and workers as well as clog the main parts of rolling stock such as inverters. To improve the air quality in subway tunnel, SMRT(Seoul Metropolitan Rapid Transit Corporation) has developed anti-pollution devices such as Magnetic Dust Collector, Vacuum Cleaner For Rail Road and Particulate Removing Sprinkler Vehicle. Introducing these mechanical devices, this paper is mainly devoted to explaining the characteristics of collected dust according to the result of particle-size analysis and componential analysis.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.7 no.6
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• pp.141-148
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• 1998

A loader is construction & road or agricultural machinery for lifting, moving, and mixing. This study deals with the agricultural mini loader for stock raising farming. The performance of the machine is established by pulling power, working lifting capacity, and minimum circling radius, etc. Also, driving easiness and endurance are very important in manufacturing. Thus, this study has developed the loader with the 4-wheel driving equipment by gear transmission, the 4-wheel steering equipment by power handle steering type, and the equipment making four wheels touch simultaneously on the rugged ground. The developed loader having these functions was very fit in a small cattle shed or a rugged ground. This study is divided into two parts; (I) development of 4WS transmission and (II) construction of the loader by 4WS system and other equipments.