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  • Title/Summary/Keyword: Point-oriented

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Development of the Design Program of the Brake System for the Tractor-Semitrailer Vehicle (Tractor-Semitrailer 차량의 브레이크 시스템 설계 프로그램 개발)

  • 서명원;권성진;박윤기;양승환;박병철
    • Transactions of the Korean Society of Automotive Engineers
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    • v.9 no.3
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    • pp.108-120
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    • 2001
  • In this paper, the braking performance considering the dynamic weight is analyzed about the tractor-semitrailer vehicle. The basic brake performance, the parking brake performance, the emergency brake performance and the locking point deceleration etc. are to be calculated for the brake system design of the tractor-semitrailer vehicle. This braking performance is related to traffic regulations and braking characteristics according to the vehicle deceleration, the tire-road friction coefficient and specifications of the air brake system. The design program for the braking performance based on various design variables of the vehicle and the air brake system is developed integrating the analysis functions. This design program is developed by an object oriented programming method that is windows based. GUI (Graphic User Interface) function and the convenience of operating are greatly considered.

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Stochastic Characteristics of the Tensile Strength of Concrete Depending on Stress State (응력상태에 따른 인장강도의 확률적 특성)

  • Zi, Goang-Seup;Oh, Hong-Sub;Kim, Byeong-Min;Choi, Hyun-Ho
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.11a
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    • pp.877-880
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    • 2006
  • The stochastic nature of the tensile strength of concrete is investigated theoretically and experimentally. The tensile strength of concrete was modeled by a theory based on the failure probability of a crack arbitrarily oriented within a concrete body. According to this model, the stochastic nature of the tensile strength depend on the current stress state. This aspect was checked experimentally using a classical three point bend specimen and a rectangular plate specimen loaded at the center. It has been known that the biaxial strength is no different from the uniaxial strength. However, if the region where the tensile strength is constant gets small, the biaxial tensile strength increases and its stochastical variation decreases.

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Variable Speed Drives of Induction Motor for Traction Application with Modified Sliding Mode Control

  • Ryoo, Hong-Je;Kim, Jong-Soo;Rim, Geun-Hie;Dragos Ovidiu Kisck;Won, Chung-Yuen
    • Journal of KIEE
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    • v.11 no.1
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    • pp.62-68
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    • 2001
  • In this paper it is proposed an advanced modified sliding mode control of a rotor field oriented control of induction motor. The application of this unconventional control has very good results, such as disturbance rejection and nice dynamic properties. Stability can be guaranteed even in the worst situation. A conventional "sliding mode" controller is characterised by fast switching control signal, which causes the chattering of the drive system. To overcome this problem, a modified law is used, by introducing a hysteresis band and a continuous control, which modifies the conventional law. The control is accomplished with dual TMS320C44 floating-point digital signal processor. The validity of the proposed method was verified by experiment on the propulsion system simulator, used for the development of Korean High-Speed Railway Train(KHSRT).in(KHSRT).

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Considering Service Factors in R&D Project Selection: Telecommunications and Broadcasting Convergence in Korea

  • Jun, Hyo-Jung;Kim, Tae-Sung;Yeon, Seung-Jun;Ha, Won-Gyu
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.36 no.6B
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    • pp.631-641
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    • 2011
  • Digital Multimedia Broadcasting (DMB) and Internet Protocol Television (IPTV) are now in commercial service, tearing down the traditional boundaries between the telecommunications and broadcasting sectors. These latest developments also hold important implications for research projects in related areas. Both telecommunications and broadcasting being fields with a strong service orientation, market demand should be the primary consideration when selecting research and development (R&D) projects in these areas. This study presents a process for selecting converged telecommunications-broadcasting technology development projects from a demand-oriented perspective, using criteria that are based on projected future demand characteristics. Aimed at increasing the efficiency of the R&D project selection process in telecommunications and broadcasting convergence, this study can point out new directions in R&D management in this field.

Aspect Dynamic Weaver Architecture Design using Hook and Decorator Pattern (훅과 Decorator 패턴을 이용한 Aspect 동적 위버 아키텍처 설계)

  • Kim, Jin-Hyung;Song, Young-Jae
    • Proceedings of the Korean Information Science Society Conference
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    • 2005.07b
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    • pp.400-402
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    • 2005
  • 동적 Aspect 프로그래밍(Aspect-Oriented Programming : AOP)은 로깅과 같은 비 기능적인 부분을 모듈화할 수 있도록 해주는 새로운 프로그래밍 기법이다. AOP는 절러 클래스에 영향을 미치는 행위들을 재사용 가능하도록 Aspect로 캡슐화 시켜준다. 기존의 Aspect 위버(weaver)에서는 Aspect를 위빙 할 경우, 새로운 서비스나 메소드를 추가하고자 한다면 서브클래스를 별도로 상속을 해주어야하며, 이로 인해 코드의 라인수가 증가되며, 수행 시간도 느려지게 된다. 이러한 문제점을 해결하기 위하여 동적 Aspect 위버 상에 Decorator 패턴을 적용하여 별도의 서브클래스를 상속하지 않고, 필요한 메소드만을 추가하여 위빙시키고, Aspect의 join point에 훅(hook)을 첨가하여 불필요한 메소드의 실행을 제거해준다. 이로 인해 수행속도와 재사용성을 증가시킬 수 있게 된다.

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Fabrication of Textured Al2O3MulliteSiC Nano-composite by Slip Casting in a High Magnetic Field and Reaction Sintering

  • Sakka, Yoshio;Saito, Sho;Honda, Atsushi;Suzuki, Tohru S.;Moriyoshi, Yusuke
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • 2006.09a
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    • pp.327-328
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    • 2006
  • We have demonstrated that textured Al2O3mulliteSiC nanocomposites can be fabricated by slip casting followed by partial oxidation - reaction sintering of mixed suspensions of Al2O3 and SiC powders in a high magnetic field. The sintered density was changed by the degree of oxidation at 1200C and 1300C. The degree of orientation of alumina in the nanocomposite was examined on the basis of the X-ray diffraction patterns and scanning electron micrographs. It is confirmed that alumina-oriented nanocomposites were fabricated. The three-point bending strength at room temperature was observed for the nanocomposites.

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A Study on the Intrustion Tolerance System Applied To the Security System

  • Shin Seung-jung;Kim Jung-tae;Ryu Dae-hyun;Na Jong-Whoa
    • Journal of information and communication convergence engineering
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    • v.3 no.1
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    • pp.38-42
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    • 2005
  • The cyber attacks on the computer system in nowadays are focused on works that do not operate specific application. The main key point that we protect information security system has an access control to keep an application. Most of system has a main function to protect an infrastructure such as hardware, network and operating system. In this paper, we have presented an intrusion tolerance system that can service an application in spite of cyber attacks. The proposed system is based on the middle ware integrating security mechanism and separate function of application and intrusion tolerance. The main factor we use security system in nowadays is service to keep a persistency. The proposed intrusion tolerance system is applicable to such as medical, national defense and banking system.

On the Development Strategy of the Container Port coping with the Innovation Process of Logistics (로지스틱의 진화에 대응한 항만의 발전 전략에 관하여(2))

  • 이철영;김현;여기태
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 1999.10a
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    • pp.59-69
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    • 1999
  • Recently, the role of container ports is radically changing. These changes are largely driven by the innovation process of Logistics such as Supply Chain Logistics and Global Logistics due to the international expansion of industry. Under this environment, It is required that the container port should act as a integral part of a Supply Logistics Chain especially to provide the customer-oriented logistics service. This paper deals with the development strategy of container ports coping with these changes in the view point of container ports as a Logistics infrastructure to provide customer-response services and necessary to the economic promotion of hinterlands. Strategy is suggested in the phases of the customers desire, the pattern of container cargo, the economic promotion of hinterlands, and interrelation of container ports in north-east Asia and also domestics through the analysis of competiveness of container ports.

A Study of Reconfiguration for Load Balancing in Distribution Power System (배전계통 부하 균등화를 위한 재구성에 관한 연구)

  • Seo, Gyu-Seok;Baek, Young-Sik
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.8
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    • pp.1360-1366
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    • 2007
  • In this paper, the load balancing which is one of the distribution power system's operation purposes was studied. Reconfiguration of Distribution power system presents that the configuration is changed by changing the switch on/off status which exists in the system according to the mentioned purpose. Through this method, the load of distribution power system is shown to be balanced. As a characteristic of complicated distribution power system, system is designed by being applied by OOP(Object Oriented Programming) method which connected more flexibly than existing Procedural Programming method, and the process of calculating the distflow and the loss of configurated system is shown. In addition, this paper suggests more efficient method compared by the results of reconfiguration on the purpose of the loss minimization and by the result of distribution power system reconfiguration on the purpose of load balancing. Moreover, it searches for the method to approach the global optimal solution more quickly.

'Y'Oriental Medical Clinic Interior Design ('Y'한의원 인테리어 디자인)

  • Park, Sung-Won
    • Proceedings of the Korean Institute of Interior Design Conference
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    • 2005.10a
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    • pp.223-226
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    • 2005
  • The latest trend of our medical industry seems to have a raise on more expectation and interest in mystical therapeutics of herb medicine and its efficiency especially for the disease such as chronicity and other obstinacy that used to be impossibie to be cured with only Western medical treatment. potentiality of ideal medical treatment through interchanging of medical study between Eastern and Western is becoming an issue today. Herb medicine is our native ethnic medicine and is based on the friendly-nature and human oriented under one of the classification of natural medicine. The point of this medicine has a strong connection with the conceptional trait of Health-Care that is been newly paid a lot of attention in Western medical science. This 'Y'Oriental Medical Clinic Interior Design is to grant a new possibility of global recognition of herb medicine getting over from a limited ethnic medicine by correcting the existing problems and expanding its scope to a part of natural medicine and to newly establish its meaning as a space for Health-Care utilizing a concept of nature.

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