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음의 각을 가지는 허니컴 스포크를 사용한 비 공압타이어의 접지압 분포
김광원,김두만,Kim, Kwangwon,Kim, Dooman 항공우주시스템공학회 2010 항공우주시스템공학회지 Vol.4 No.2
An airless tire has advantages over the conventional pneumatic tire in terms of flat proof and maintenance free. According to the recently disclosed inventions on the airless tire, non-pneumatic tire (NPT) consists of the flexible polygon spokes. Considering the NPT structure, the spokes undergo the tension-compression cyclic loading while the tire rolls. Therefore the spokes of NPT are required to have both stiffness and resilience under the cyclic tensile-compressible loading. In general, if a material has a high stiffness, it shows a low elastic strain limit. In this paper, using the auxetic honeycomb structure with negative poissons's ratio, the spokes of NPT tire are designed to have both stiffness and resilience. Finite element based numerical simulation of the contact pressure of a NPT is carried out with ABAQUS.
Which country"s end devices are most sharing vulnerabilities in East Asia?
Kwangwon Kim(김광원),Yoon Ji Won(윤지원) 한국정보보호학회 2015 정보보호학회논문지 Vol.25 No.5
과거와 비교하여, 오늘날의 사람들은 오픈 채널을 통해 단말기를 제어할 수 있다. 비록 이러한 오픈 채널이 사용자들에게 편의를 제공하지만, 보안 사고의 빌미를 제공 하기도 한다. 본 논문은 단말기 간의 관계들에 가중치를 주는 인간 중심적인 보안 리스크 분석 방법을 제안한다. 이 방법은 네트워크에 존재하는 한 노드가 가지는 평균적인 불확실성을 표현하는 엔트로피 레이트를 응용하여 만들어졌다. 다른 크기의 네트워크들을 비교하는데 있어서 엔트로피 레이트를 이용하는 것에는 한계가 있기때문에, 주어진 네트워크에 대하여 주어진 네트워크와 동일한 노드수를 가진 컴플릿 네트워크의 엔트로피레이트를 나누어 비교가 가능하도록 만들었다. 또한, 그래프 상에서 랜덤워크에 대한 엔트로피 레이트의 기본 전제인 irreducible의 위배를 피하는 방법 또한 기술하였다. Compared to the past, people can control end devices via open channel. Although this open channel provides convenience to users, it frequently turns into a security hole. In this paper, we propose a new human-centered security risk analysis method that puts weight on the relationship between end devices. The measure derives from the concept of entropy rate, which is known as the uncertainty per a node in a network. As there are some limitations to use entropy rate as a measure in comparing different size of networks, we divide the entropy rate of a network by the maximum entropy rate of the network. Also, we show how to avoid the violation of irreducible, which is a precondition of the entropy rate of a random walk on a graph.
김광원(Kim Kwangwon) 한국언어문학회 2007 한국언어문학 Vol.63 No.-
Manhae’s 『A Lover"s Silence』 was made of the structure of a paradox, which originating in the world of Zen(禪). It is because that the world of Zen (禪) is instinctive and general world transcending time and space, so the world comprehends all paradoxes contradictory to ‘A=A’(the world of relativity) and ‘A≠A’(the world of negation) each other.<BR> On this point, 『A Lover"s Silence』 is in the world in where separation is separation and also separation is not separation, and it is checked out the world of ‘anguish, that is, awakening’ to identify real love in a pain of separation. The reason of ‘anguish, that is, awakening’ is that anguish in itself is really non-substantial and simply nothing but a process of karma.<BR> From this point of view, ‘anguish, that is, awakening’, Manhae’s 『A Lover"s Silence』 was considered, but examined divided its speaker into three speaker s:‘Manhae, Han Yong-woon’, ‘female speaker’ and ‘mail speaker’. As the result, through Manhae, Han Yong-woon and male as the speaker the creative background of this collection of poems becomes shown more dynamic, because through them the awareness of an age, their fatherland was robbed by Japanese imperialism, is expressed more clearly.<BR> All pains of separation expressed in the poems of 『A Lover"s Silence』, those are the pains on the assumption that is love. The representative is the first poem, ?A Lover"s Silence?. It is because that ‘a lover’ leave me and be in the state of silence, but at that time the speaker is rather to become perceived the reason of true love and not to suppress his feelings to sing a love song.
Auxetic Spoke로 설계된 비공기압 타이어의 접지압
김광원(Kwangwon Kim),김두만(Doo-Man Kim) 한국항공우주학회 2011 韓國航空宇宙學會誌 Vol.39 No.8
비공기압 타이어(Non-Pneumatic tire)는 공기압 타이어와는 다르게 스포크(Spoke)로 공기압의 역할을 담당하는 새로운 타이어이다. 이 타이어는 공기압 타이어의 펑크에 대한 위험과 공기압 유지가 필요 없는 장접을 가졌으며, 공기가 존재하지 않는 우주에서도 사용이 가능하다. 본 연구에서는 음의 각으로 이뤄진 허니컴 구조의 비공기압 타이어용 수직 하중에 따른 접지압을 구하여, 이를 공기압 타이어와 비교하였다. 비공기압 타이어의 하중해석을 위해 ABAQUS를 사용하여 유한요소해석을 수행하였다. A Non_Pneumatic tire (NPT) has spoke to replace air of the pneumatic tires. ANPT appears to have advantages over the conventional pneumatic tire in terms of flat proof and maintenance free. And a NPT can also be used in the space environment since it uses no air for inflation. In this study, the static contact pressure of NPTs with auxetic honeycomb spokes is investigated as a function of vertical loading and is compared with that of a pneumatic tire. The finite element based numerical simulation of the local stress of an airless tire is carried out with ABAQUS for varying vertical force and honeycomb spokes geometries.