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DADS 프로그램을 이용한 軍用 軌道車輛의 사격시 運動 解析
鄭仁洙 陸軍士官學校 1983 한국군사학논집 Vol.25 No.-
The object of this paper is to present a computer based method for analysis of spatial mechanical systems using DADS, which is a package program for Dynamic Analysis and Design System. A mechanical system consists of several rigid bodies connected by joints and springs. Some of the joint formulations and general equations of motion are presented. To illustrate the potential of the program, the motion of a tracked military vehicle during firing is simulated. The responses of forward fire, 45degree fire, and side fire are presented.
건설업 정보화를 위한 법제도 개선방향 : 건설CALS/EC를 중심으로 Based on Construction CALS/EC
정인수,김태학,주기범,나혜숙 대한건축학회 2001 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.21 No.2
Knowledge and information are necessary for the domestic construction industry to acquire advancement and international competitiveness in the information society of 21st century. In order to achieve knowledge and information of the construction industry, the construction CALS/EC is a very essential part. The modification and reform of related law and system are prerequisite to propagate the Construction CALS/EC in public and private construction projects. This study aims to present the improvement directions of related law and system for the dissemination of the Construction CALS/EC basis. To do so, this paper investigated not only the current status of the Construction CALS/EC but also foreign countries' cases related to information telecommunication & electronic commerce.
정인수,김석준,조덕형,Jung, Insoo,Kim, Sukzoon,Cho, Teockhyeong 한국음향학회 2018 韓國音響學會誌 Vol.37 No.4
지속적으로 강화되는 배기가스 및 연비 규제에 대응하기 위해 자동차 업계에서는 다양한 노력을 하고 있다. 하지만 이로 인해 NVH(Noise, Vibration, and Harshness) 성능이 악화되는 경우들이 많이 발생하고 있다. 사례로 가솔린 엔진의 고압 펌프 소음 및 MPI(Multi-Point Injection)와 GDI(Gasoline Direct Injection)의 듀얼 분사로 인한 가속 천이 소음, 가솔린 터보차저 소음, 디젤 엔진에서의 분사변수 캘리브레이션으로 인해 악화되는 연소음에 대한 원인 및 개선방향을 제시하였다. 이러한 소음들은 고주파 소음으로 운전자에게 거친 청감을 유발하기 때문에 적절한 NVH 대책으로 저감시키는 노력이 반드시 필요하다. The automotive industry is making various efforts to cope with ever-increasing exhaust emissions and fuel economy regulations. However, this often results in degraded NVH (Noise, Vibration, and Harshness) performance. For example, we proposed the causes and improvements for the noise generated by the high-pressure pump noise of a gasoline engine, the change of acceleration noise due to dual injection of MPI (Multi-Point Injection) and GDI (Gasoline Direct Injection), the noise of a gasoline turbocharger, and the combustion noise deteriorated due to the injection parameters calibration in a diesel engine. Since these noises are caused by the high frequency noise, and the driver feels the rough sound quality, efforts to reduce them with proper NVH measures are indispensable.
TiAl 일방향응고합금의 β 응고법을 이용한 미세조직제어
丁仁洙,吳明勳,韋當文 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.3
Ti-47A1-2W alloys, which have been reported as having alloy composition of β-solidification, were directionally solidified by using Bridgman and floating zone type directional solidification(DS) apparatuses. Mechanical properties of DS ingots were evaluated by room temperature and high temperature (800℃) tensile tests. In the results of DS by the floating zone type apparatus at a growth rate of 30 ㎜/h, the lamellar microstructure was well-aligned parallel to the growth direction. Ingots having lamellar orientation parallel to the growth direction showed excellent room temperature tensile ductility. High temperature tensile yield strength was maintained similarly to the yield strength at room temperature. The texture of γ lamellar laths was identified from the results of electron back scattered diffraction pattern (EBSD) analysis of the lamellar orientation of DS ingots, which were manufactured by a floating zone furnace. On the basis of the EBSD results, it was estimated that the preferred growth directions of bcc-β dendrite grown at high temperature near the melting point was in the [001]_β direction at a growth rate of 30 ㎜/h and the [111]_β direction at a growth rate of 90 ㎜/h.