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천연가스용 고압 인젝터의 Plunger valve 크기 변경에 따른 질량 유량 균일도에 관한 연구
윤태준(Taejun Yoon),김권세(Kwonse Kim),최문석(Munseok Choe),이홍윤(Hongyoon Lee),강도경(Dogyeong Kang),최두석(Dooseuk Choi) 한국자동차공학회 2017 한국자동차공학회 지부 학술대회 논문집 Vol.2017 No.6
Natural gas is in spotlight as an alternative energy source to deal with global exhaustion of resource and environmental pollution. There are many studies related to natural gas. Among them, technology of the fuel rail that maintains internal pressure 8 bar and above is under development. But, the internal flow of the injector becomes unstable because high pressure gas is getting into inlet of injector. Therefore, this study provided the design variables of the plunger valve to reduce the uneven flow rate of internal fluids. As a result, the size of the plunger valve decreases, a uniformity of the internal flow rate is reduced and the pulsation is also reduced however, internal resistance increases, bore size of plunger valve shall be appropriately sized.
Flow Wars: Systemizing the Attack Surface and Defenses in Software-Defined Networks
Yoon, Changhoon,Lee, Seungsoo,Kang, Heedo,Park, Taejune,Shin, Seungwon,Yegneswaran, Vinod,Porras, Phillip,Gu, Guofei Institute of Electrical and Electronics Engineers, 2017 IEEE/ACM transactions on networking Vol.25 No.6
<P>Emerging software defined network (SDN) stacks have introduced an entirely new attack surface that is exploitable from a wide range of launch points. Through an analysis of the various attack strategies reported in prior work, and through our own efforts to enumerate new and variant attack strategies, we have gained two insights. First, we observe that different SDN controller implementations, developed independently by different groups, seem to manifest common sets of pitfalls and design weakness that enable the extensive set of attacks compiled in this paper. Second, through a principled exploration of the underlying design and implementation weaknesses that enables these attacks, we introduce a taxonomy to offer insight into the common pitfalls that enable SDN stacks to be broken or destabilized when fielded within hostile computing environments. This paper first captures our understanding of the SDN attack surface through a comprehensive survey of existing SDN attack studies, which we extend by enumerating 12 new vectors for SDN abuse. We then organize these vulnerabilities within the well-known confidentiality, integrity, and availability model, assess the severity of these attacks by replicating them in a physical SDN testbed, and evaluate them against three popular SDN controllers. We also evaluate the impact of these attacks against published SDN defense solutions. Finally, we abstract our findings to offer the research and development communities with a deeper understanding of the common design and implementation pitfalls that are enabling the abuse of SDN networks.</P>
자율주행의 기능 안전을 위한 슬라이딩 모드 관측기 기반 가중 가속도 고장 탐지 및 허용 제어 알고리즘
송태준(Taejun Song),오광석(Kwangseok Oh),이종민(Jongmin Lee),윤영민(Youngmin Yoon),이경수(Kyongsu Yi) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
This paper describes a weighted acceleration fault detection and tolerant control algorithm for functional safety of autonomous driving based on sliding mode observer. In order to detect fault signal of longitudinal acceleration, fault detection regions have been reconstructed using multi-sliding mode observer. The weighted fault diagnosis method has been proposed in this study to enhance diagnosis reliability. The fault signal in acceleration has been reconstructed based on sliding mode observer using information of the preceding vehicle acceleration. Based on the reconstructed fault signal, fault-tolerant control algorithm has been constructed for functional safety of autonomous driving. The 3D vehicle model and actual driving data have been used to conduct reasonable performance evaluation.
공적개발원조(ODA) 사업 자체평가에 대한 메타평가 연구
윤수재 ( Yoon Sujae ),조태준 ( Cho Taejun ) 한국거버넌스학회 2017 한국거버넌스학회보 Vol.24 No.2
본 연구는 ODA 사업의 자체평가에 대한 메타평가지표를 개발하고, 실제 메타평가를 통해 ODA 사업의 개선을 위한 효율적인 방안을 제시하는데 목적을 두고 있다. 메타평가에 대한 문헌연구를 바탕으로, 본 연구는 우리나라 ODA 사업의 메타평가지표를 개발한 후에 ODA 자체평가보고서들을 대상으로 평가투입·평가과정·평가결과·평가활용에 대한 메타평가를 실시하였다. 즉 2013년에 실시된 개별 ODA 사업에 대한 자체평가보고서 27개를 분석대상으로 선정하여 메타평가를 진행하였다. 평가결과, 본 연구는 ODA 사업에 대한 효율성 측정방안 개발, 성과모니터링 시스템의 구축, 평가전문가의 활용, 그리고 메타평가지표의 개발 등을 개선방안으로 제시하였다. This study has two objectives, including developing the items to measuring ODA`s self-evaluation in using meta-evaluation and suggesting some alternatives improving ODA activities. Based on the literature in the fields of ODA, meta-evaluation, and self-evaluation, this study develops some measurement items for the purpose of conducting meta-evaluation. In addition, this study conducts meta-evaluation to examines 27 ODA reports in using the self-evaluation. Conducting the evaluation, this study suggests some alternatives, including the development of performance monitoring system, evaluation experts, meta-evaluation items, and measure instruments for efficiency in the field of ODA.