• Title, Summary, Keyword: TWC

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Characteristics of ecological structure and spatial distribution of micro-plankton in relation to water masses in the northern East China Sea(nECS) in summer 2019 (2019년 여름 동중국해 북부해역의 수괴 분포에 따른 미소플랑크톤의 공간분포 및 생태구조 특성)

  • Yoon, Yang Ho;Park, Ji Hye;Lee, Hyeon Ji;Soh, Ho Young
    • Korean Journal of Environmental Biology
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    • v.38 no.3
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    • pp.355-370
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    • 2020
  • We conducted a field survey to analyze the ecological structure and spatial distribution of microplankton (phytoplankton and ciliates) in relation to water masses at 21 stations on the surface and chlorophyll-a maximum layers (CML) in the Northern East China Sea (nECS; 32°-33°N; 124°00'-127°30'E) from August 3 to August 6, 2019. The results showed that the water masses were divided into Chinese Coastal Waters (CCW) and the Tsushima Warm Current (TWC). The CCW showed the environmental characteristics of high temperature and low salinity, and the TWC showed high temperature and high salinity. The characteristics of the phytoplankton community in the CCW showed various community structures related to the nutrients supplied from the large rivers of the Chinese continent. However, the TWC had simple community structures because it originated near the equator and moved northward. The standing crops of phytoplankton and ciliates were very high in the CCW but showed low at the TWC. In particular, from the higher standing crops of protozoa than plant plankton at the TWC, the energy flow at the lower tropic levels caused by the microbial loop that fed on heterotrophic bacteria played an important role in the production of resource organisms. In other words, the marine ecological structure of the nECS in summer could be estimated as a bottom-up system at the CCW and a top-down system at the TWC.

A Study on On-board ATO/TWC Antenna Design and Manufacture (차상 ATO/TWC 안테나 설계 및 제작에 관한 연구)

  • Yoo Sung-Ho;Park chong chon;Kang Lee-Taeg;Cho Young-Wan;Cha Ji-Ju
    • Proceedings of the KSR Conference
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    • pp.903-908
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    • 2005
  • Existing ATC/ATO/TWC system has a ATC(Automatic Train Control) antenna for receiving the speed code, a ATO(Automatic Train Operation) antenna for obtaining the exact distance to go to platform and TWC(Train and Wayside Communication) antenna for communication between on-board and wayside system. This paper proposes the ATO/TWC antenna with tele-powering module, telegram transmitter/receiver module. This antenna communicates with a passive type tag(wayside Precision Stop Marker) for the information of distance from the stop position and a active type tag for the door command and status in the platform.

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A Case study of the automatic operation due to the Train to the Wayside to TWC communication(Focused on the Subway ATO/TWC equipment) (열차와 지상간 TWC 통신에 의한 자동운전에 관한 연구(지하철 ATO/TWC 설비를 중심으로))

  • Hwang, In-Kil;Song, Joong-Ho
    • Proceedings of the KSR Conference
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    • pp.900-905
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    • 2006
  • 5678SMRT (Seoul Metropolitan Rapid Transit Co) by a ATC/ATO system the other side which is operated with an automatic movement with a manual operation, the Seoul subway 1.2 lines ATS and 3.4 lines adopt a ATC method and they are operated. But it is improving progressively in SMRT railway ATO method. The ATO the operation method leads exchange of information of wayside and train system for and it is possible, the TWC system configuration is becoming wayside and train system and the radio antenna. It discussed the equipment for a TWC system and a automatic operation from the dissertation which it sees. It investigated a data exchange, a message format and an interface control method and it joined in and a system maintenance conservative method it discussed.

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Variation of Sound Speed in the Tsushima Warm Current Region of the East Sea (동해의 쓰시마난류 분포역에서 음속의 변동)

  • LEE Chung Il;CHO Kyu Dae;KIM Sang Woo
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.36 no.2
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    • pp.170-177
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    • 2003
  • This study is to analyze the influence of the Tsushima Warm Current (TWC) on the variation of sound speed in the southern part of the East Sea. Sound speed is calculated by method of Chen and Millero (1977:, based on the CTD data measured in June of 1996. Sound speed in the central part of the TWC is about $45ms^{-1}$ more fast than that in the other regions without the TWC. Sound speed minimum layer (SML) in the TWC region exists between loom and 341 m, while it exists between 260m and 290m in the non-TWC region. SML distributes along the path of TWC over continental shelf in the coastal waters of Japan.

A Study for Running Test Result of Train Automatic Driving Control by ATC/ATO/TWC System (차상 ATC/ATO/TWC 시스템의 열차 자동운전 구현의 현차시험 결과 고찰)

  • 강리택;이종성;김경식;박계서
    • Proceedings of the KSR Conference
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    • pp.578-585
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    • 2000
  • ATC/ATO/TWC System is the used for the train operation instead of drivels. It is interfaced with train, train equipment, wayside facilities. In this paper described configuration signaling system, construction of signaling system software and structure of system safety. This paper describes the method of performing automatic driving by ATC/ATO/TWC. Also, reported test result for mainline static test and mainline running test.

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The Structural Analysis of Three-Way Catalyst Substrate using Coupled Thermal-Fluid-Structural Analysis (열유동구조연성해석을 이용한 삼원촉매담체의 구조 해석)

  • Lee, Sung-Riong;Cho, Seok-Swoo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.5
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    • pp.3035-3043
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    • 2015
  • This study evaluates the thermal structural safety of the three-way catalyst(TWC) substrate for domestic passenger cars. Thermal-fluid boundary conditions on the TWC substrate were determined by D-optimal DOE. The thermal stresses on the TWC substrate were calculated by the temperature distribution obtained from the CFD results. The safety factors of the TWC substrate were determined by statistical strength and stress distributions and estimated to be 0.275. The thermal stresses for TWC substrate exceeded the strength of the material. Therefore, it is necessary to redesign the TWC substrate because it has much shorter service life than design life.

The oceanic condition of the Tsushima Warm Current region the southern part of the East Sea (Sea of Japan) In June, 1996

  • Lee Chung Il;Cho Kyu Dae
    • Proceedings of KOSOMES biannual meeting
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    • pp.167-174
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    • 2003
  • Oceanic conditions of the Tsushirm Wann Current (1WC) region in the southern area if the East Sea (the Japan Sea) are examined using data obtained from a CREAMS (Circulation Research if the East Asian Marginal Seas) cruise in June 1996. In 1990s, a lower temperature appears in $19\%$ and in this period, two branch of the TWC exist and the first branch of the TWC flows inshore if the Japanese coastal region compared to tfr1t in the other years, especially in the sfr1llower water layer at less th:1n about 2mm. The TWC cored with the higher salinity (>34.6 psu) is clearly observed over the continental shelf zone in the Japanese coastal region and offshore and identified by geostrophic calculation Intrusion if the TWC into the East Sea through the Korea Strait (the Tsushima Strait) makes the density structure in the water column change and the water mass in the TWC region is unstable based on Brunt- Vaisala frequency.

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The Fluctuation Characteristics of the Water Mass and the Current Structure of the Southeastern Region of The East Sea

  • Cho, Kyu-Dae;Lee, Chung-Il
    • Proceedings of the Korean Society of Fisheries Technology Conference
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    • pp.181-182
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    • 2000
  • Due to the instability of the EKWC, the oceanic conditions in the East Sea are affected by the fluctuations of the moving paths of the TWC, polar fronts, and warm eddies. In particular, warm eddies play an important role in spreading the surface water of the East Sea from its southern coastal region to its interior region (Isoda, 1994). However, the fluctuation characteristics of the meandering TWC and the warm eddies in the East Sea are not yet known due to the instability of the TWC. Hideaki(1999) showed that the moving paths and features of the TWC in the coastal regions of Japan were not constant. (omitted)

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Comparison of NOx Reduction Characteristics of NOx Storage Catalyst and TWC for Lean-burn Natural Gas Vehicles (희박 천연가스 자동차용 NOx 흡장촉매와 TWC의 NOx 반응특성 비교)

  • 최병철;정우남;이춘희
    • Transactions of the Korean Society of Automotive Engineers
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    • v.12 no.5
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    • pp.79-84
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    • 2004
  • We evaluated the reduction performance of NOx storage catalyst and TWC for lean-burn natural gas engine by the model gas. The method of unsteady state reaction was used to compare with reduction performances of NOx storage catalyst and TWC. It was found that the effective parameter was rich spike duration, temperature of the model gas. In the presence of $CO_2$ and $H_2O$ in the reaction mixture was decreased the NOx reduction performance.

A Study on an Adaptive Three-Way Catalyst Model for the Monitoring Algorithm (정화 능력 진단 적용을 위한 학습을 통한 삼원촉매 모델의 구현에 관한 연구)

  • 최동범;김용민;박재홍;윤형진
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.3
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    • pp.65-70
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    • 2003
  • In this paper, an adapted TWC model and its application to the monitoring algorithm are proposed. As TWCs have the different characteristics, the model has to be corrected to diagnose more accurately. In the TWC model oxygen storage and release rate model are adapted to the installed TWC to whose characteristics related. The model learns from the downstream $O_2$ sensor output during the vehicle's operation. From the results, the model is adapted to the Installed TWC's characteristics. using this model, the monitoring algorithm can diagnose the no more accurately. Finally the algorithm is validated with simulations using the data logged from a retail car.