• 한국감성과학회:학술대회논문집
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• 한국감성과학회 2004년도 추계학술대회 논문집
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• pp.23-23
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• 2004

• 유통과학연구
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• 제8권2호
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• pp.5-12
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• 2010

우리나라의 철도운송 분담율은 매년 6%를 유지하고 있으나 철도물류에 대한 지속적인 투자 및 물류 합리화 여부에 따라 철도물류는 상반된 결과를 가져올 것이다. 철도물류의 발전에 크게 기여할 것으로 예상되는 남북철도 뿐만 아니라 철도물류에 대한 연구가 상당히 미흡한 상황에서 철도 물류기지의 수요예측, 규모를 예측하고, 물류기지를 통한 남북철도 활성화 방안을 연구하고자 하였다. 철도 물류기지를 통한 남북철도의 활성화 방안으로서 첫째, 물류기지에서 취급하는 석탄 수요자와의 파트너쉽을 강화하여야 하며, 둘째, 강릉에서 제진까지 동해 북부선의 건설이 필요할 뿐만 아니라 노후화된 북측 선로의 유지보수에 필요한 재정적 지원이 이루어져야 한다. 셋째, 장·단거리 운송 및 대형 화주에 대한 철도운임을 탄력적으로 적용할 필요가 있으며, 넷째, 해외 광산개발 참여 등을 통하여 철도 운송권을 확보하여야 하고, 다섯째, 양회사와 같은 소형 화주를 지속적으로 발굴하여야 한다.

• The Journal of the Acoustical Society of Korea
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• 제26권2E호
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• pp.44-49
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• 2007

Donghae City - Ulleung Island Line (DC-UI Line) is a representative line for underwater and geoacoustic modeling in the middle western East Sea. In this line, an integrated model of P-wave velocity is proposed for a low-frequency range target (<200 Hz), based on high-resolution seismic profiles (2 - 7 kHz sonar and air-gun), shallow and deep cores (grab, piston, and Portable Remote Operated Drilling), and outcrop geology (Tertiary rocks and the basement on land). The basement comprises 3 geoacoustic layers of P-wave velocity ranging from 3750 to 5550 m/s. The overlying sediments consist of 7 layers of P-wave velocities ranging from 1500 to 1900 m/s. The bottom model shows that the structure is very irregular and the velocity is also variable with both vertical and lateral extension. In this area, seabed and underwater acousticians should consider that low-frequency acoustic modeling is very range-dependent and a detailed geoacoustic model is necessary for better modeling of acoustic propagation such as long-range surveillance of submarines and monitoring of currents.

• 한국경영과학회지
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• 제41권4호
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• pp.1-13
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• 2016

In response to the government's recent attempts to introduce competition and efficiency criteria in the rural railway service provision, this study is to empirically estimate public service values on continuous operation of two rural railways-Young Dong Line (YDL) and Donghae Nambu Line (DNL)-that will be realized beyond the passengers' use values. Based on a contingent valuation survey conducted on 600 passengers and local residents, YDL respondents were willing to pay significantly higher amount compared to those of DNL respondents. Especially tourists traveling on YDL were willing to pay the highest amount, and local residents of DNL were willing to pay relatively high amount. The results will provide useful information in makings decisions on the selection of PSO railways, the amount of PSO compensation and which railways to close, so on.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 B
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• pp.1032-1034
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• 2001

As well known, a solar cell has an optimal operating point to be able to get the maximum power $P_{max}$. So, many $P_{max}$ tracking controllers using the line voltage of a solar cell have been popularly used. But it may vary depending on the miss match between the solar cell output and the load. In this paper, we investigate the possibilities of $P_{max}$ control using the current tracking controller and the output voltage and the output current instead of the solar cell output power. And we also examine about the optimal power converter using ZVCS step up and down chopper circuit to operate the solar cell at an optimal voltage using these variables. And then, we show some experimental results to confirm the successful operation.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2003년도 춘계학술대회 논문집
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• pp.403-408
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• 2003

This paper presents measurement to develop load model for electric locomotive. Load model is defined as polynomial form and each coefficient is solved by the least square method. Therefore, many data is required for using this method. The measurement is performed on KNR line, from Chongryangri to Donghae. The subject of measurement is voltage, current, active power, reactive power an frequency for EL8100.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 B
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• pp.1126-1128
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• 2001

A single-stage high-power-factor electron ic ballast operating in critical conduction mode is presented in this paper. The proposed topology is based on integration of a boost-like converter and a LCC Type half-bridge serial resonant inverter. The power-factor-correction(PFC) stage is a boost-like converter operating in critical conduction mode for positive and negative half cycle voltage respectively at line frequency (60Hz) so that a high power factor is achieved naturally. The simulated and experimental results for 100w fluorescent lamps operating at 42kHz switching frequency and 220V line voltage have been obtained.

• 통상정보연구
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• 제8권4호
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• pp.177-207
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• 2006

DMZ is came from the antagonism of ideology of the cold war and will of peace embodiment of Gangwon province, the only divided province in the world, at the time of opening physical distribution transportation time on ground between south and north Korea. Analyze the central plan of Gangwon province that includes Mt. Geumgang sightseeing, the Gyeongwon line and the Donghae line. As regaining the overland route with Eurasian continent that lost because of the division of Korea into north and south, We have lived as people in a island country actually for the last 60 years. we should extend the racial imagination that lean toward the ocean to the continent again. As we present the use of efficient overland distribution transportation that is endowed with the fitness of the Gangwon province's plan to make a new developing opportunity physically and mentally. we would seek the revitalization of Gangwon economy and inter Korean trade.

• 한국환경복원기술학회지
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• 제13권6호
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• pp.63-74
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• 2010

In this study, wetlands and forest vegetation surrounding rail, road of DMZ area and Civilian Control Line were studied as follows: Plant communities hierarchical system of forest vegetation classified according to the results of phytosociological methods of Braun-Blanquet (1964) as; Quercus mongolica community, Quercus mongolica-Quercus variabilis community and Quercus acutissima -Quercus mongolica community. Wetland vegetation major communities; Scirpus wichurae community, Scirpus fluviatilis community, Juncus effusus var. decipiens community, Typha orientalis community, Typha angustata community, Juncus alatus community, Miscanthus sacchariflorus community, Phragmites communis-Miscanthus sacchariflorus community, Hragmites communis community, Phragmites communis-Alnus japonica community, Alnus japonica community, Phragmites japonica community, Salix koreensis community, Prunus padus community, Alnus japonica community, Zizania latifolia community and Amorpha fruticosa community were surveyed. Coastal sand dune vegetation in a DMZ area and the Civilian Control Line was mainly characterized by; Carex pumila, Elymus mollis, Carex kobomugi, Rosa rugosa, Calystegia soldanella, Lathyrus japonica and Aster hispidus, species that are of typically sand dune vegetation.

• 수산해양기술연구
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• 제42권2호
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• pp.78-85
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• 2006

A survey on the fishing gear for octopus drift-line fishing was done in Gangwon-do, Sacheon, Gyeongnam and Hokkaido, Japan, while a survey on the environments of fishing grounds used data from January to August from the Korea east coast farming forecast system of Donghae Fisheries Research and Development Institute. The present situation of fishing was examined with boats engaging in drift-line fishing from March to August in the coastal waters along Gangneung. The fishing tackle for octopus drift-line fishing was made manually, and the size, shape, and weight of the hook and number of shooting used vary according to the fishing time and region. Lead is used as the material for sinkers. As bait, pork fat with skin is mostly used in Gangwon-do. The temperature of the bottom water layer in the coastal fishing ground of Gangneung from April to June ranges from $3.2-12.4^{\circ}C$, which is the optimal temperature for octopuses. During July and August, the temperature ranges from $5.0-20.6^{\circ}C$. The maximum difference between day and night temperatures reached up to $9.2^{\circ}C$. Salinity is generally stable at $33.2-35.324.6%_{\circ}$, which does not affect the inhabitation of octopuses. The octopus catch reached its peak from May to July, while most octopuses weighed less than 1 kg (76.7%). The results show that it is effective to carry out octopus drift-line fishing up to a depth of 40 meters; and that the maximum number of octopuses per line is obtained with an operation time of six hours.