• Title/Summary/Keyword: Long-line method

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Long Term Distribution Planning Process using the Forecasting Method of the Land Use (토지용도에 따른 부하예측을 이용한 중장기 배전계획 수립)

  • Kim, Joon-Oh;Park, Chang-Ho;Sun, Sang-Jin;Lee, Jae-Bong;Kwon, Sung-Chul
    • Proceedings of the KIEE Conference
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    • 1999.07c
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    • pp.1447-1449
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    • 1999
  • The KEPCO is developing the load forecasting system using land-use simulation method and distribution planning system. A distribution planning needs the data of present loads, forecasted loads and substations. distribution lines information. By the distribution planning system, the distribution line designer determines the substations and feeder lines plan. This paper presents the method of formulation process for the long term load forecasting and optimal distribution planning, and describes the case study of long term distribution planning of Suwon-city according to the newly applied method.

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A Study on Manufacturing of the Long Fiber-reinforced Thermoplastic (LFT) Automotive Under Cover Using the In-line Compounding (ILC) Technology (인라인 컴파운딩 기술을 이용한 장섬유강화 플라스틱 자동차 언더커버의 제조에 관한 연구)

  • Lee, Kyu-Se;Lee, Kyung-Sick
    • Composites Research
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    • v.30 no.6
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    • pp.399-405
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    • 2017
  • We manufactured the long fiber-reinforced thermoplastic prototype of under cover using in-line compounding technology, and investigated the formability, mechanical properties and durability of the prototype of under cover. We manufactured the injection mold for the prototype through injection molding analysis and consideration of weight reduction. We investigated the formability of the prototype by evaluating the residual length and dispersion of fiber, and also tested the mechanical properties such as flexural strength, stiffness and impact strength. We investigated the durability of the prototype by the Key-Life Test(KLT) method which is generally used for the automotive interior parts.

A Technical Trend on UHF Techniques for On-Line PD Monitoring and Site Testing for Transformer (전력용 변압기의 온라인 PD 모니터링과 시험을 위한 UHF 기술 동향)

  • Kim, Byung-Woo;Kim, Yun-Seok;Kim, Chang-Bok;Cho, Soo-Young;Choi, Young-Il;Choi, Yong-Sung;Lee, Kyung-Sup
    • Proceedings of the KIEE Conference
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    • 2007.07a
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    • pp.1972-1973
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    • 2007
  • A field-oriented UHF system for on-line PD monitoring of transformers is designed, which has been installed inside the oil tank of a transformer. This system has successfully captured long intermittent discharge signals that hadn't been detected through conventional techniques, and solved the problem successfully. The results demonstrate that UHF technique has great advantages for on-line PD monitoring of transformers. By adopting the peak detection technique, it becomes easy and effective for the transplantation of the phase-resolved pattern recognition technique from conventional method to UHF method, and then to realize continuous on-line monitoring, source characterization and trending analysis.

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A Development of V type Suspension String Set for UHV Transmission Lines (초고압 송전선로용 V련 현수애자장치의 개발)

  • Sohn H. K.;Lee H. K.;Keum E. Y.;Min B. W.;Choi J. S.;Choi I. H.
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.497-499
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    • 2004
  • Due to a typhoon named MAEMI on Sep12, 2004, 7 transmission towers collapsed and 3 were damaged in the Gyeongnam and Busan areas. These caused long-term black-outs in Goeje-do. When a transmission tower collapses or is damaged, Construction will take more than 2 months and this will be accompanied by long-term black-outs. Therefore a temporary iron pole is used in such emergencies. Current temporary rehabilitation angle steel iron Pole consistes of around 800 members, 2,800 bolts and it takes about 5 days to construct a temporary transmission line. Consiquently wide black-outs occur during the construction of the temporary transmission line. To reduce black-out time, the construction period must be reduced as much as possible. This paper presents new methods to reduce temporary transmission line construction time to within 48 hours by applying a self-reliance assembling method instead of the current man power assembling method and by modulizing each angle steel with duralumin.

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Shallow ground treatment by a combined air booster and straight-line vacuum preloading method: A case study

  • Feng, Shuangxi;Lei, Huayang;Ding, Xiaodong;Zheng, Gang;Jin, Yawei
    • Geomechanics and Engineering
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    • v.24 no.2
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    • pp.129-141
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    • 2021
  • The vacuum preloading method has been used in many countries for soil improvement and land reclamation. However, the treatment time is long and the improvement effect is poor for the straight-line vacuum preloading method. To alleviate such problems, a novel combined air booster and straight-line vacuum preloading method for shallow ground treatment is proposed in this study. Two types of traditional vacuum preloading and combined air booster and straight-line vacuum preloading tests were conducted and monitored in the field. In both tests, the depth of prefabricated vertical drains (PVDs) is 4.5m, the distance between PVDs is 0.8m, and the vacuum preloading time is 60 days. The prominent difference between the two methods is when the preloading time is 45 days, the injection pressure of 250 kPa is adopted for combined air booster and straight-line vacuum preloading test to inject air into the ground. Based on the monitoring data, this paper systematically studied the mechanical parameters, hydraulic conductivity, pore water pressure, settlement and subsoil bearing capacity, as determined by the vane shear strength, to demonstrate that the air-pressurizing system can improve the consolidation. The consolidation time decreased by 15 days, the pore water pressure decreased to 60.49%, and the settlement and vane shear strengths increased by 45.31% and 6.29%, respectively, at the surface. These results demonstrate the validity of the combined air booster and straight-line vacuum preloading method. Compared with the traditional vacuum preloading, the combined air booster and straight-line vacuum preloading method has better reinforcement effect. In addition, an estimation method for evaluating the average degree of consolidation and an empirical formula for evaluating the subsoil bearing capacity are proposed to assist in engineering decision making.

Calculation of the Normal Operation Rate of Monitoring Hardware in the Long Tunnels of High-Speed and Urban Railways (고속 철도와 도시철도 장대터널 계측기기의 정상 작동율 산정 연구)

  • Woo, Jong-Tae
    • Journal of the Society of Disaster Information
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    • v.18 no.1
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    • pp.80-90
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    • 2022
  • Purpose: The objective of this study was to improve smart monitoring and monitoring management technology in long tunnels by investigating and analyzing the normal operation rates of monitoring hardware in the long tunnels of high-speed and urban railways. Method: This study evaluated, analyzed, and compared the normal operation rate of 6-8 types of monitoring hardware for each long tunnel, targeting three high-speed railway lines with a long tunnel (i.e., Suseo-Pyeongtaek Line, Gyeongbu Line, and Honam Line) and two urban railway groups with a long tunnel (i.e., Seoul Metro Lines 5, 6, and 7, and 9). Result: The rank of the normal operation rate of monitoring hardware was in the order of Suseo-Pyeongtaek High-Speed Railway (92.1%), Seoul Metro Lines 5, 6, and 7 (85.8%), Seoul Metro Line 9 (85.2%), Gyeongbu High-speed Railway (80.5%), and Honam High-speed Railway (46.7%). Conclusion: The mean normal operation rate of the monitoring hardware in the three high-speed railway long tunnels was 83.4%, and that of the two urban railway long tunnels was 85.5%, indicating that the deviation between them was small. The mean normal operation rate of the monitoring hardware in the long tunnels of the five high-speed and urban railway lines was 84.2%.

An Analysis on Seoullo 7017 in Terms of Spatial Configuration and Pedestrian Movement in Comparison with the High-line Project

  • Choi, Junho;Choi, Jaepil
    • Architectural research
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    • v.21 no.2
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    • pp.31-39
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    • 2019
  • Inspired by the success of the High-line project in New York, The Seoul Metropolitan Government launched a project to convert an overpass near Seoul station into a pedestrian park. Seoullo 7017 went through instant success after its opening in May 2017; however, there is a continuous controversy over its long-term impact as shown in the exemplary cases like the High-line project. This study aims for quantitative investigation through the comparative analysis between Seoullo 7017 and the High-Line in the perspectives of spatial configuration. Space Syntax was chosen as the analysis method for this research. Integration (3) in Space Syntax is known to have a high correlation with pedestrian volume; thus, by using this method, spatial structure was analyzed by comparing the statistically verified results of changes in the spatial structure of the Highline with those in Seoul. The results indicated that the influence of Seoullo 7017 was less than that of the High-line in terms of spatial configuration. The reason for this difference is spatial configuration between Manhattan and Seoul. The High-line is located in Manhattan which has an urban grid structure, whereas Seoul has non-geometric urban structure, the neighborhood unit in Korea. Also the center of the overpass isn't connected well with its surroundings.

The Straight Line Repair for Unilateral Incomplete Cleft Lip - Cases report and journal review (편측성 불완전 구순열의 직선 봉합법에 의한 수복 - 증례 보고 및 문헌고찰)

  • Kim, Hak-Kyun;Kim, Jae-Jin;Kim, Eun-Suk
    • Korean Journal of Cleft Lip And Palate
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    • v.11 no.2
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    • pp.77-82
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    • 2008
  • The harmonious lip length, residual scar and Cupid's bow width and peak with a normal side are the aims of a unilateral cleft lip repair. Also, long term amelioration without necessary of revisional surgeries may be the ideal conditions. No one method can satisfy the wide varieties of cleft lip deformities. Recently with rearrangement of paraoral muscle and some modifications, a straight line repair technique has been concerned again. Straight scar line, simplicity, and short learning curve are the advantages of the straight line technique. Here two cases of the simple straight line technique were presented and discussed for its usefulness and reliability with short reviews of previous reports.

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Competitiveness Increasing Methods of Metropolitan Railway Shinbundang-line (신분당선 전철의 경쟁력 제고 방안)

  • Han, Woo-Jin;Park, Jeong-Soo
    • Proceedings of the KSR Conference
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    • 2009.05a
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    • pp.1936-1942
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    • 2009
  • Shinbundang-line is new Metropolitan Railway which was invested by private capital and is under construction for opening in 2010. Now Shinbundang-line pursues various innovation, for example, an express train which uses long distance of each station, and an unmanned operation. And it may be independent of existing metropolitan railway system from a viewpoint of line and fare system. So according to the present plan, Shinbundang-line will be not able to get sufficient demand because of weak connection with existing lines and monotonous function of the line. And it may be difficult to deliver various innovation which Shinbundang-line prepares to passengers. Hereupon, in this paper, I propose 3 methods for increasing competitive power of Shinbundang-line railway. First, making Shinbundang-line a trunk railway line of southern metropolitan area was proposed in relation to northern and southern extension of it. In addition connection with bus and light rail was discussed. Second, multipurpose usage of Shinbundang-line was proposed as express train and conventional passenger train in that line in addition to simple metropolitan railway. Finally, an effective operation method which Shinbundang-line must have was proposed from unmanned driving and fare system side. These methods can improve Shinbundang-line and then it will solve traffic congestion of southern metropolitan area effectively.

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A Fusion Positioning System of Long Baseline and Pressure Sensor for Ship and Harbor Inspection ROV

  • Seo, Dong-Cheol;Lee, Yong-Hee;Jo, Gyung-Nam;Choi, Hang-Shoon
    • Journal of Ship and Ocean Technology
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    • v.11 no.1
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    • pp.36-46
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    • 2007
  • The maintenance of a ship is essential for safe navigation and hence regular surveys are prescribed according to the rule of classification societies. A hull inspection is generally performed by professional divers, but it takes a long time and the efficiency is low in terms of time and cost. In this research, a ROV(Remotely Operated Vehicle) named as SNU-ROV(Seoul National University-ROV) is developed to replace the conventional inspection method. In this system, the ROV is intended to be used for inspecting ship and harbor because harbor inspection is merging as a safety measure against any possible terror actions. In order to increase the efficiency of inspection, the ROV must be able to measure the exact position of damages. SNU-ROV has a positioning system based on LBL(Long Base Line). In shallow water such as harbor, however, LBL has bad DOP(Dilution of Precision) in the depth direction due to the limited depth. Thus LBL only can not locate the exact depth position. To solve the DOP problem, a pressure sensor is introduced to LBL and a complementary filter is attached by using indirect feedback Kalman filter. Thus developed positioning system is verified by simulation and experiment in towing tank.