• Title/Summary/Keyword: Air Tool

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A Study on the Performance of Mechanical Crash Sensors (기계식 충돌 센서의 성능 해석)

  • Kim, K.H.
    • Transactions of the Korean Society of Automotive Engineers
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    • v.3 no.1
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    • pp.136-142
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    • 1995
  • An analysis model is proposed for the performance prediction of typical ball and tube type mechanical crash sensors based upon mass-spring-viscous gas damping idealization. Also a construction of mechanical crash pulse generator is suggested as an experimental tool for calibration and verification of model predictions. A sensor tuning procedure for a particular set of crash pulses is suggested based upon the analysis model and the experimental tools.

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A Study on Characteristics of Electric Heater Regeneration Filter Trap in Diesel Engine (디젤기관에서 전기 히터 재생 여과 트랩의 특성에 관한 연구)

  • 류규현;박만재
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.10 no.1
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    • pp.10-15
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    • 2001
  • Urgent increasing of the vehicles influence air pollution and the damage of the plants and animals. Particularly, exhaust-ing particulate of diesel vehicles give serious effect to human life. Therefore, this study aim to reduce amount of particulate and to contribute developing after-treatment in diesel engine. Through the experimental and theoretical study about charac-teristics of the electric heat regeneration, various results are obtained.

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Dynamic Temperature Sensitivity of Temperature Sensors for the Oil Coolers (오일 냉각기용 온도센서의 동적 온도 민감도에 관한 연구)

  • 이찬홍;이상호;박효찬
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2003.04a
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    • pp.62-67
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    • 2003
  • In this Paper, the dynamic temperature sensitivity and mu. temperature measurement errors of oil and air sensor in oil cooler are evaluated to predict design validity of sensors under special oil and atmosphere temperature changes. The temperature tracking of oil sensors for periodic temperature changes is simulated by obtaining thermal response coefficient from experiment. By this method, it is possible to design the optimal sensors with the admitted temperature measurement errors.

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Prediction vehicle interior noise using Acoustic Transfer Function (Acoustic Transfer Function을 이용한 실차 실내 소음 예측)

  • Koh, Sung-Gyoo;Shin, Han-Seung;Cho, Whan-Chul
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2011.04a
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    • pp.534-537
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    • 2011
  • This Paper present prediction Vehicle Interior Noise using ATF(Acoustic Transfer Function) and engine radiated sound power. This is useful tool to qualifying the effectiveness of Air-borne noise Path. Furthermore This method provide acoustic package performance of the vehicle and able to prepare frequency band to same segment or benchmarking vehicle.

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마이크로 선반에서의 절삭성 평가

  • 김재건;정종운;고태조;김희술
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2004.05a
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    • pp.256-256
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    • 2004
  • Micro/Meso 기계적 가공은 기존 MEMS 공정에서 제작할 수 없었던 높은 세장비(aspect ratio)를 가지는 제품을 가공할 수 있을 뿐만 아니라 보다 높은 가공 정밀도를 획득할 수 있다. 따라서, 미소 부품에 대한 마이크로/매소 단위의 미세 절삭 가공을 위해서는 공간적 측면과 에너지 소비, 정밀도 측면에서 효율적인 시스템을 구성하기 위해서 마이크로 머시닝 전용 기계가 요구된다. 이에 본 연구에서는 '마이크로 팩토리' 의 기본 공작기계인 마이크로 선반을 개발하여 초정밀 미소 절삭에 대한 연구를 진행 중에 있다.(중략)

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A Study on Operations Research Models for Environmental Management (환경관리에서의 O.R. 모형에 관한 연구)

  • Chang ByungMan
    • Korean Management Science Review
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    • v.21 no.2
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    • pp.1-14
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    • 2004
  • This paper presents a review on the operations research modeis for environmental management including water, land, and air poliution in the environmental chain and including waste treatment, reverse logistics, and product recovery in the supply chain for last 30 years. The integrated and globalized environmental issues have given OR professionals a lot of natural opportunities for an effective environmental management with mathematical programming and computer simulation tool.

Modeling Method of Continuous Combat Simulation on the basis of System Dynamic Modeling (시스템 다이나믹 모델링에 의한 연속 시뮬레이션 전투모델링 방법 - 합동전장 교전 프로토타입 모델을 중심으로 -)

  • 유진헌;최상영
    • Journal of the military operations research society of Korea
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    • v.25 no.1
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    • pp.37-54
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    • 1999
  • In this paper, we proposed a modeling method of continuous combat simulation by using VENSIM. VENSIM is a CASE tool for developing continuous simulation. It provides a simple and flexible way of building simulation models from causal loop or influence diagram. As a case model, we developed "a prototype model of battle"incorporating infantry, artillery, air defense weapon, aircraft, and guerrilla engagement.ngagement.

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Deposition and high temperature oxidation characterization of CrAlSiN thin films

  • Kim, Sun-Kyu;Lee, Dong-Bok
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2007.11a
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    • pp.7-9
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    • 2007
  • Thin films of CrAlSiN were deposited on SKD11 tool steel substrate using Cr and AlSi cathodes by a cathodic arc plasma deposition system. The influence of process parameters on the deposited film properties were investigated. The oxidation characteristics of the films were studied at temperatures ranging from 800 and 1000+C up to 50 h in air. The films showed superhardness and good oxidation resistance..

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How to enhance the security and operation of Self Bag Drop systems (SBD(Self Bag Drop) Systems의 보안 및 운영 개선 방안에 대한 연구)

  • Kim, Ha-na;Kwon, Pilje;Lee, Kang-seok
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.26 no.3
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    • pp.55-65
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    • 2018
  • The SBD systems have made it possible that all boarding procedures are completed by passengers. With the SBD, air tickets can be issued and baggage can be consigned without the help of airline officers. This way, the SBD can improve the passenger circulation speed as well as decrease the time for passengers to wait for check-in, which is connected to the reduction of airlines' operaitonal costs. However, given that the SBD is a new technology, it has potentials to be used as a tool for air terrorism. This study purposes to determine methods to enhance the security and operation of SBD systems. With the aim, this paper investigated the existing literature on SBDs, self-check-in, airport security, air terrorism, risk management, aviation accidents, and information security. In order to compile real-time information about the SBD operations, twelve airports in North America, Europe, and Asia were analyzed based on existing studies on international SBD trends.

A study on the effect of the condition number in the magnetic field mapping of the Air-Core solenoid

  • Huang, Li;Lee, Sangjin
    • Progress in Superconductivity and Cryogenics
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    • v.17 no.2
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    • pp.31-35
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    • 2015
  • Mapping is a useful tool in the magnetic field analysis and design. In some specific research area, such as the nuclear magnetic resonance (NMR) or the magnetic resonance imaging (MRI), it is important to map the magnetic field in the interesting space with high accuracy. In this paper, an indirect mapping method in the center volume of an air-core solenoid is presented, based on the solution of the Laplace's equation for the field. Through the mathematical analysis on the mapping calculation, we know that the condition number of the matrix, generated by the measurement points, can greatly affect the error of mapping result. Two different arrangement methods of the measurement points in field mapping are described in this paper: helical cylindrical line (HCL) method and parallel cylindrical line (PCL) method. According to the condition number, the HCL method is recommended to measure the field components using one probe. As a simple example, we mapped the magnetic fields in a MRI main magnet system. Comparing the results in the different methods, it is feasible and convenient to apply the condition number to reduce the error in the field mapping calculation. Finally, some guidelines were presented for the magnetic field mapping in the center volume of the air-core solenoid.