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장용석(Yongsuk Jang),이명진(Myungjin Lee),신태영(Taeyoung Shin),김승현(Seung-Hyun Kim),성지은(Jieun Seong),김성아(Sung-A Kim),최용인(Yongin Choi),이혜숙 과학기술정책연구원 2016 정책연구 Vol.- No.-
The purposes of this study are three-folds. First, it introduces the globally discussing concept of ‘Inclusive Innovation’ to Korean policy arena and tries to enhance its concept. For this purpose, it reviews various international and domestic literatures on innovation policies for inclusive growth in the context of various global initiatives including UN SDGs. It also analyses possible working mechanism on how innovation can achieve both inclusiveness and growth. Second, this study reviews diverse Korean policies from the angle of ‘Inclusive Innovation’ and develop several successful policy cases that can be contributed to the global discussion. It overviews past and current Korean polities in four different aspects including social, territorial, industrial and gender inclusiveness. It identifies five prominent policy cases and contributes them to the OECD’s Policy Toolkit for inclusive innovation, which are presented in the appendix. Third, this study extends the scope of ‘Inclusive Innovation’ to the global dimension and tries to develop innovation strategy that can enhance global inclusiveness. It argues that global society should pay more attention on widening North-South gaps, which are largely resulted from widening innovation capacities, and need to develop effective innovation strategies that help low-income and developing countries in promoting their innovation capacities. It proposes several specific programs that global society can deliver together including expansion of Appropriate Technology Centers for helping especially low-income countries, programs for strengthening STI related institutional and policy capacities of developing countries, and sustainable operation of educational and training programs. There are a couple of remaining challenges or future tasks. One is conceptual elaboration of ‘Open and Inclusive Science’ framework and its application to the global inclusive innovation efforts. Another is innovation policy for generation inclusiveness - i.e., reducing gaps between generations possibly caused by current innovation policies.
[디젤엔진부문] 투명 아크릴 모델을 이용한 디젤 인젝터 노즐에서의 캐비테이션 유동에 관한 연구
장용석(Yongsuk Jang),김만식(Manshik Kim),민경덕(Kyoungdoung Min) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_1
Experiment was conducted in transparent acrylic nozzle model which was scaled up by 10 times in order to study the behavior of cavitation flow inside the nozzle holes. High speed CCD camera was used to visualize the flow inside sac chamber and holes. Refractive index matching technique was also used to prevent distortion of images. Reynolds number and Cavitation number was simultaneously matched in the same range of the real injector by means of controlling the flow rates and pressures.<br/> The experimental results shows that the difference between cavitation layer and liquid layer causes very turbulent flow inside the nozzle hole and the effect of needle lift is the dominant factor that determines the behavior of the cavitation flow pattern.<br/> In the low lift case. due to the transient nature of turbulent flow within the sac volume. string cavitation from one hole to another hole occurred in intermittent way<br/>
Jang Jongmoon,Hwang Geon-Tae,민유호,Kim Jong-Woo,안철우,최종진,Hahn Byung-Dong,Choi Joon-Hwan,박동수,Jung Yongsuk,Yoon Woon-Ha 한국세라믹학회 2020 한국세라믹학회지 Vol.57 No.6
In the energy harvester, the fatigue caused by cyclic vibration is an important challenge aff ecting the lifetime of the device. The aim of this study is to evaluate the fatigue behavior of the cantilever-type piezoelectric energy harvester (PEH) based on a single crystal macro-fi ber composite (SFC), and propose a method for improving durability. The initial output of the fabricated PEH shows 6 mW root mean square power at 0.5 gravitational acceleration at resonance frequency (23 Hz). In fatigue test under cyclic vibration, the dramatic power decrease and waveform distortion caused by the mechanical crack at the top electrode line were identifi ed after 5 × 10 6 cycles. To improve the issue, the stress distribution on the top electrode line was analyzed by fi nite element analysis and the reinforced structure was proposed by attaching a 50 μm-thick polyimide fi lm. The reinforced PEH shows the durable output power until 10 7 fatigue cycles without a signifi cant output power loss. These study potentially can be applied to the development of reliable SFC-based PEH with long-term lifetime.
차량 쏠림 개선을 위한 전륜 현가시스템의 기하공차 최적화
김용석(Yongsuk Kim),장동영(Dongyoung Jang) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.9
This study is focused on simulation-based dimensional tolerance optimization process (DTOP) to minimize vehicle pulls by reduction of dimensional variation in front suspension system. In previous studies, the effect of tires and wheel alignment sensitivity have mainly been investigated to eliminate vehicle pulls in nominal design condition without allocating optimal tolerance level for selected components, among various factors regarding vehicle pulls such as vehicle design parameters, vehicle weight balance, tires, and environmental factors. Unfortunately, there are wide variations in the real vehicle, and these have impacted actual vehicle pulls, especially wheel alignment effects from suspension geometry variation has not been considered in the previous studies. In the tolerance design of suspension, tolerance variables with the uncertainty such as parts dimensional variation, assembly process, datum position and direction, and assembly tool tolerance has a great influence on the variation of the suspension dimensional performances. This study introduces total vehicle pull prediction model in considering major key factors for vehicle pull sensitivity. The Monte Carlo-based tolerance analysis model using Taguchi robust method is developed to optimize dimensional tolerance parameters, satisfying on the target variation level.
LFT적용 플라스틱 테일게이트의 구조해석 및 설계최적화
이용석(Yongsuk Lee),장성복(Sungbok Jang),신철민(Cheolmin Shin) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
자동차용 테일게이트(Tail gate)는 보통 SUV 차량의 트렁크 도어를 의미한다. 종전에는 철(Steel)로 만드는 것이 일반적이었지만 현재는 복합 소재(Composite)를 적용하여 개발하는 연구가 활발히 진행 중이다. 자동차의 경량화를 위해 많은 부품이 금속에서 복합재로 대체되는 상황이며 본 연구에서는 복합재료 중 LFT(Long Fiber Reinforced Thermoplastic)를 사용하여 금속이 아닌 플라스틱 테일게이트(Plastic Tailgate)를 개발하였다. 자동차용 테일게이트의 성능 요구도는 소재가 철(Steel)인 경우에 한정해서 만들어진 것이 대부분이라 플라스틱으로 소재 변경 시 추가 또는 삭제해야 할 부분이 존재하지만 본 연구에서는 테일게이트 성능에서 일반적으로 평사하는 굽힘(bending), 비틀림(Tortion), 로킹(Locking), 리프팅(Lifting) 총 4가지 경우에 대해 구조해석 기법을 적용하여 평가를 진행하였다. 굽힘(bending), 비틀림(Tortion), 로킹(Locking), 리프팅(Lifting)과 같은 강성 평가 방법은 실제 테일게이트를 열고 닫는 경우에 발생할 수 있는 상황을 반영하고 실제 시험에서는 보수적인 평가가 가능하도록 경계조건이 구성되어 있다. 본 연구에서는 완성 자동차 업체의 시험 조건에 따른 데이터를 기반으로 테일게이트의 구조해석을 진행하였다. 초기 설계 단계에서부터 외력에 따른 응력과 변형량을 평가함으로써 위상 최적화를 진행하였고 그 결과 기존에 금속으로 제작된 테일게이트와는 다르게 플라스틱 소재에 적합하게 두께 및 형상이 최적화 되었다. 본 연구에서는 구조해석 툴을 사용해 시험 방법을 고려한 FEM(Finite Element Model)(Fig.1)을 만들고 정적해석(Static Analysis)을 진행한 후, 각 조건별로 변위에 대한 결과(Fig.2)를 도출하였다. 해석 결과를 바탕으로 제품을 개발 한 후, 각 조건에 따른 실제 시험을 진행하고 시험결과와 해석결과의 상관관계를 검토함으로써 해석의 신뢰성을 확보하여 개발 제품에 대한 구조 건전성을 확보할 수 있을 것으로 기대한다.