• 한국자동차공학회논문집
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• 제6권5호
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• pp.75-85
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• 1998

This paper presents the procedures and technique of the decision on the decision on the mount in a diesel engine development newly. To assess the vibration chara- cteristics of the engine plus transmission, their inertia moments are calculated for three engine versions. i.e., NA(Naturally Aspirated), TC(Turbocharged) and TCI(Turbocharged and Intercooled). These data are used to determine the mount layout and stiffness values affecting the noise quality of an engine as well as a vehicle. The main purpose of this paper is to design the mount rubber having the optimal stiffness characteristics through the investigation of the calculation results and the mount conditions when an engine is installed in a vehicle using the existing engine mount room. Thus, this paper describes the optimal mount positions, rubber stiffnesses, natural frequency, mode shapes and so on using ADAMS program to apply the newly developed engines to three different vehicles.

• 한국조경학회지
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• 제48권3호
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• pp.22-33
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• 2020

사인시스템은 현재 관광지구에서 가장 널리 사용하는 안내매체 중 하나이며, 그것의 역할은 관광지의 자원과 문화적 가치를 소개하고, 관광객들의 관광 체험을 더 잘 할 수 있도록 도와주는 것이다. 이에 본 연구는 관광객에게 있어서 태산 관광지구 사인시스템의 영향 요인을 도출하고, 만족도를 분석하여 향후 관광객의 만족도를 높이기 위한 태산등산로 사인시스템을 제언하는 것이 목적이다. 연구방법은 선행연구에서 파악된 사인시스템의 평가항목을 도출하고, 통합 세분화하여 태산등산로 사인시스템의 평가항목을 선정하였으며, 설문조사와 요인분석을 실시하여 영향요인을 도출했다. 그리고 관광객의 만족도를 알아보기 위해 퍼지 종합 평가(Fuzzy Comprehensive Evaluation)를 실시했다. 본 논문의 결과를 요약하면, 첫째, 태산등산로 사인시스템의 4가지 영향요인으로 해설내용, 외관조형, 해설방식, 배치관리를 도출하였다. 둘째, 영향요인의 높은 가중치 순서는 해설내용, 외관조형, 해설방식, 배치관리 순으로 나타났으며, 중요도에서 실용성과 미관을 더 중시한다는 점을 유도해 낼 수 있었다. 셋째, 사인시스템 만족도는 해설내용, 외관조형, 배치관리요인의 등급은 '좋음' 이며, 해설방식요인의 등급은 '보통'으로 나타났다. 이는 태산등산로 자연 경치와 문화 가치에 대한 관광객의 이해를 심화시키지 못한 것으로 생각된다. 이런 결과는 향후 사인시스템을 재정비할 때 계획 및 설계에 필요한 이론적 근거를 제공하여 관광체험의 전반적인 만족도를 높이고자 하는데 의의가 있다.

• 한국소음진동공학회논문집
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• 제24권2호
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• pp.102-107
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• 2014

The engine excitation forces are considered as major vibration source for the forklift truck, especially in small class. Even though the current engine mounting system designs are acceptable for vibration isolation, the performance of the engine mounting system is still required for the tendency of light weight, higher power and driver's higher vibration requirement. In this paper vibration reduction technique of forklift engine which is supported on rubber mounts is presented. Based on the dynamic model of resilient engine mounting system, design evaluation program is established. The design optimization technique and evaluation method of system properties are discussed. Effects of optimal design are validated through comparison with test results.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2013년도 추계학술대회 논문집
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• pp.787-791
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• 2013

The engine excitation forces are considered as major vibration source for the forklift truck, especially in small class. Even though the current engine mounting system designs are acceptable for vibration isolation, the performance of the engine mounting system is still required for the tendency of light weight, higher power and driver's higher vibration requirement. In this paper vibration reduction technique of forklift engine which is supported on rubber mounts is presented. Based on the dynamic model of resilient engine mounting system, design evaluation program is established. The design optimization technique and evaluation method of system properties are discussed. Effects of optimal design are validated through comparison with test results.

• 마이크로전자및패키징학회지
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• 제18권3호
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• pp.53-57
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• 2011

In the modern packaging technologies highly condensed metal interconnects are typically formed by highcost processes. These methods inevitably require the precise controls of mutually dependant process parameters, which usually cause the difficulty of the change in the layout design for interconnects of chip to-chip, or chip-to-substrate. In order to overcome these problems, the unique concept and methodology of self-assembly even in micro-meter scale were developed. In this report we focus on the factors which influenced the self-formed bumps by analyzing the phenomenon experimentally. In case of RMA flux, homogenous pattern was obtained in both plain surface and cross-section surface observation. By using RA flux, the phenomena were accelerated although the self-formtion results was inhomogenous. With ussage of moderate RA flux, reaction rate of the self-formation was accelerated with homogeneous pattern.

• 마이크로전자및패키징학회지
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• 제23권4호
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• pp.43-48
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• 2016

3-Dimensional System in Package (3-D SiP) structure (Amkor calls it mPossum-molded Possum) using double side Surface Mount Technology (SMT) and double side molding was evaluated in order to achieve small/thin form factor as well as good functionality by integration and double side layout. As the new platform on laminate substrate basis, molding process was challenge in mold flow balance at top and bottom side and package warpage control over the overall assembly process. There were two types of different molding process evaluated with 1) 1-step molding which was done at both side at the same time and 2) 2-step molding which was done at the conventional molding process twice. Mold simulation helped to narrow down the material selections and parameters available before actual sample build. There were many challenges for this first trial in design/ parameter and material types but optimized them to enable this structure.