• Title/Summary/Keyword: Structure improvement

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Strength and Dynamic Performance Analysis for Tilting Train Wheel (틸팅차량용 차륜의 구조 강도 및 동적 성능 해석)

  • Hur, Hyun-Moo;Kwon, Sung-Tae;Seo, Jung-Won;Kwon, Seok-Jin
    • Journal of the Korean Society for Precision Engineering
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    • v.23 no.11 s.188
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    • pp.85-92
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    • 2006
  • For the improvement of a conventional railway speed, tilting train(Tilting Train express) is under the development aiming for a maximum speed 180km/h. Compared to the existing conventional rolling-stock, tilting train could take an advantage of speed improvement about $20{\sim}30%$ on curve sections due to the improvement of cowing performance. However, this speed increasement creates a severe load at wheels, thus it is necessary to study the safety of wheel for tilting train preferentially. On the other hand, it is under consideration that the wheel for conventional railway rolling-stock at speeds of 150km/h will be applied to tilting train at speeds of 180km/h. In this paper, we have studied the strength of wheel structure, the geometrical contact characteristics, and the dynamic performance of wheel to evaluate the safety of wheel for tilting train.

Study on the Improvement of world-cup stadium field using Stabilizer (고화재 혼합처리를 이용한 월드컵 주경기장 부지의 개량에 관한 연구)

  • 천병식;권형석;전진규;양정호
    • Proceedings of the Korean Geotechical Society Conference
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    • 1999.10a
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    • pp.263-270
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    • 1999
  • In country, for 2002 World-cup the peak is to construct soccer playground. the stabilizing method by additives is mainly applied of permanent improvement for bearing capacity of structure foundation and for strength, durability and transformation of road pavement layer except for construction machine's trafficability and bearing capacity. This study is on soft ground improvement of $\bigcirc$$\bigcirc$ world-cup stadium field. construction field constitutes of very various layers and after construction the lawn grass should be planted on the surface of the earth and in addition, chemical effects should be limited from improved ground layer. Mixing soft clay in field with three domestic representative additives, it evaluated the unconfined compression strength. In the results, after curing during 28 days the objective strength has been obtained on about 5% combination ratio.

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A STUDY ON THE MOST SUITABLE DESIGNING OF SHOEMAKING -Centering around the adhesive tensile and absorption percentage of assembly insole- (제화의 최적설계에 관한 연구 -조립식 중창의 접착강도 및 흡수율을 중심으로-)

  • 이종철
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.12 no.20
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    • pp.33-38
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    • 1989
  • In order to achieve the most suitable designing of shoemaking, the structure of shoemaking is described in this study by inquiring into structural and functional effects given by shoes to human feet. Also, the role of insole that is an essential portion in view of function in shoemaking is described and. for the improvement of quality the fact that selection of material of insole has an effect to quality is substantiated through experiments of adhesive tensile and absorption percentage. Though identification of the qualify of insole with the naked eyes is impossible because it is inserted between the internal layers of a shoe. It is not only an essential portion for the improvement of the quality of shoemaking but it gives an essential effect to the sanitation and health of human body(feet) when insole of lower qualify is used. In view of these the improvement and enhancement of the quality of home-made material of insole are earnestly required.

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Mock-up Test of Crushed Sand Concrete Using Quality Improvement Technology (고품질화 기술을 사용한 부순모래 콘크리트의 모의구조체 실험)

  • Yoo, Seung-Yeup;Kim, Gyu-Dong;Lee, Seung-Hoon;Yun, Gi-Won;Han, Cheon-Goo
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.05b
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    • pp.629-632
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    • 2006
  • This study investigated the engineering properties of crushed sand, based on improvement quality technology, and washed sand concrete by conducting mock-up test, in order to verify the availability of crushed sand for full sized structure. Test results showed that fluidity, air content, supersonic waves and corrosion state of concrete using crushed sand had favorable results. In addition, it is found that compressive strength, drying shrinkage length change, hydration heat and neutralization of crushed sand concrete exhibited similar tendency, with that of washed sand concrete. The crushed concrete using developed quality improvement technology shows comparable performance to washed sand concrete.

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Improvement of Adhesion Strength of DLC Films on Nitrided Layer Prepared by Linear Ion Source

  • Shin, Chang-Seouk;Kim, Wang-Ryeol;Park, Min-Seok;Jung, Uoo-Chang;Chung, Won-Sub
    • Proceedings of the Korean Vacuum Society Conference
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    • 2011.08a
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    • pp.177-179
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    • 2011
  • The purpose of this study is to enhance an adhesion between substrate and Diamond-like Carbon (DLC) film. DLC has many outstanding properties such as low friction, high wear resistance and corrosion resistance. However, it is difficult to achieve enough adhesion because of weak bonding between DLC film and the substrate. For improvement adhesion, a layer between DLC film and the substrate was prepared by dual post plasma. DLC film was deposited on nitrided layer by linear ion source. The composed compound layer between substrate and DLC film was investigated by Glow Discharge Spectrometer (GDS) and Scanning Electron Microscope (SEM). The synthesized bonding structure of DLC film was analyzed using a micro raman spectrometer. Mechanical properties were measured by nano-indentation. In order to clarify the mechanism for improvement in adhesive strength, it was observed by scratch test.

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An Effective Environmental Assessment for the Simple Statement of the Sea Area Utilization Consultation System (간이해역이용협의 유형분석 및 효율적 환경평가방안)

  • Lee, Dae-In;Eom, Ki-Hyuk;Kim, Gui-Young
    • Journal of Environmental Impact Assessment
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    • v.22 no.3
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    • pp.255-264
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    • 2013
  • This paper diagnosed the assessment problems and development types of the simple statement of the Sea Area Utilization Consultation System. and suggested the key assessment items for system improvement. The major types of Public Water occupation and use, and distribution characteristic of regional and coastal were analyzed by evaluate 529 review items during 2010-2012. The artificial structure installation including harbor and fishing port facilities in the South and West coast, and seawater supply and drainage for land-based aquaculture and power plant were dominated. The checklists considering each types of occupation and use in Public Water were suggested. In addition, policy proposals for system improvement were suggested.

Improvement of the On-Current for the Symmetric Dual-Gate TFT Structure by Floating N+ Channel

  • LEE, Dae-Yeon;Hwang, Sang-Jun;Park, Sang-Won;Sung, Man-Young
    • 한국정보디스플레이학회:학술대회논문집
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    • 2005.07a
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    • pp.342-344
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    • 2005
  • We have simulated a symmetric dual-gate TFT which has triple floating n+ channel to improve the on-current of the dual-gate TFT. We achieved a low hole concentration at the source and channel junction causes the improvement the potential barrier so that we observed the reduction of the kink-effect. In this paper, we observed the reduction of the kink-effect compared with the conventional single-gate TFT and the improvement of the on-current compared with the conventional dual-gate TFT.

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Improvement of efficiency in Multi-layer IPMSM using Response Surface Methodology (반응 표면법을 이용한 Multi-layer 매입형 영구자석 동기정동기의 효율 향상)

  • Fang, Liang;Kwon, Soon-O;Lee, Sang-Ho;Zhang, Peng;Hong, Jung-Pyo
    • Proceedings of the KIEE Conference
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    • 2006.07b
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    • pp.777-778
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    • 2006
  • This paper deals with the optimum rotor design approach about the multi-layer design of the buried magnets in an Interior Permanent Magnet Synchronous Motor (IPMSM), on the efficiency improvement by using Response Surface Methodology (RSM). In the multi-layer design of the prototype 15kw IPMSM, the constant amount of buried PM is split from the single-layer into double-layer design for improving the efficiency characteristics. The optimum double-layer rotor structure is built with the help of RSM analysis. The improvement of IPMSM efficiency is verified by the Finite Element Method (FEM) results comparison with the prototype single-layer IPMSM.

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A New Modified MPPM for High-Speed Wireless Optical Communication Systems

  • Rouissat, Mehdi;Borsali, Riad A.;Chikh-Bled, Mohammad E.
    • ETRI Journal
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    • v.35 no.2
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    • pp.188-192
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    • 2013
  • Previous work proposed combining multipulse pulse position modulation (MPPM) with pulse amplitude modulation to form multipulse amplitude and position modulation (MPAPM), which is a hybrid modulation that results in an improvement in bandwidth efficiency but a degradation in power efficiency. In this paper, to achieve greater power efficiency and a better data rate, we propose multipulse dual amplitude-width modulation, based on MPAPM and pulse width modulation. The proposed scheme shows a remarkable improvement in data rate and a 1.5-dB improvement in power efficiency over MPAPM, while sustaining the bandwidth efficiency. After introducing symbol structure, we present the theoretical expressions of spectral efficiency, the power requirements, and the normalized data rate, as well as the results of comparing the proposed modulation to MPPM and MPAPM.

Recent Improvement of Coastal Wave-Tide Observation and Textbooks Publication

  • Toshihiko Nagai;Chuji Yamamoto;Masao Mitsui;Yasuo Shimizu;Ahn, Hee-Do;Shin, Seung-Ho
    • Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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    • 2003.08a
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    • pp.233-239
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    • 2003
  • Coastal wave and tide information is very important in various occasions for port and harbor engineers, in the stages such as port and harbor planning, maritime structure design, maritime construction management, and coastal disaster study This paper introduces recent improvement of Japanese coastal wave-tide observation and information system named as NOWPHAS (Nationwide Ocean Wave information network for Ports and HArbourS). Development and improvement of the NOWPHAS has been achieved during recent decade in the following points of view (Nagai,2002a,2002b). (omitted)

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