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RISS 인기검색어
오늘 본 자료
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"Chalcogenide-Bridged Ditungsten (M-M) Complexes: An Experimental and Theoretical Study of the Electronic Structure and Bonding in W2(Mu-E)(Mu-Och2tBu)2(Och2tBu)6^ Where E = O^ S^ Se or Te"
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점착제 도포를 위한 유전알고리즘 기반 로봇의 최적 자세 생성 알고리즘 개발
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산업구조 변화와 집계 생산성 추세의 장기 패턴에 관한 연구
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초·중등교원 정보기술 소양의 현수준과 기대수준에 관한 연구
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Non-linear free vibrations and post-buckling analysis of shear flexible functionally graded beams
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MHD nature of ionospheric wave packets generated by the solar terminator
- 검색키워드
- 발행기관 : CHINA MACHINE PRESS/ SPRINGER VERLAG (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Wireless device connection problems and design solutions
Song, J. W.,Norman, D.,Nam, T. J.,Qin, S. CHINA MACHINE PRESS/ SPRINGER VERLAG 2016 Chinese journal of mechanical engineering Vol.29 No.6
<P>Users, especially the non-expert users, commonly experience problems when connecting multiple devices with interoperability. While studies on multiple device connections are mostly concentrated on spontaneous device association techniques with a focus on security aspects, the research on user interaction for device connection is still limited. More research into understanding people is needed for designers to devise usable techniques. This research applies the Research-through-Design method and studies the non-expert users' interactions in establishing wireless connections between devices. The 'Learning from Examples' concept is adopted to develop a study focus line by learning from the expert users' interaction with devices. This focus line is then used for guiding researchers to explore the non-expert users' difficulties at each stage of the focus line. Finally, the Research-through-Design approach is used to understand the users' difficulties, gain insights to design problems and suggest usable solutions. When connecting a device, the user is required to manage not only the device's functionality but also the interaction between devices. Based on learning from failures, an important insight is found that the existing design approach to improve single-device interaction issues, such as improvements to graphical user interfaces or computer guidance, cannot help users to handle problems between multiple devices. This study finally proposes a desirable user-device interaction in which images of two devices function together with a system image to provide the user with feedback on the status of the connection, which allows them to infer any required actions.</P>
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Lee, S.,Noh, K.,Lim, J.,Yoon, W. CHINA MACHINE PRESS/ SPRINGER VERLAG 2016 Chinese journal of mechanical engineering Vol.29 No.6
<P>Aluminum particles 15-25 mu m in size are widely used in fuel propellants and underwater propulsion systems in national defense research. However, these particles are covered with an aluminum oxide film, which has a high melting point, so ignition is difficult. To improve the ignitability of high-energy aluminum powder and to understand the reaction phenomenon as a function of particle size(15-25 mu m, 74-105 mu m, and 2.38 mm) and oxidizer(air, CO2, and argon), the natural oxide films are chemically removed. The particles are then coated with nickel using an electro-less method. The degree of nickel deposition is confirmed qualitatively and quantitatively through surface analysis using scanning electron microscopy/energy dispersive spectroscopy. To characterize the nickel coatings, elemental analysis is also conducted by using X-ray diffraction. Thermogravimetric analysis/differential scanning calorimetry (TGA/DSC) enable comparisons between the uncoated and coated aluminum, and the reaction process are investigated through fine structural analysis of the particle surfaces and cross sections. There are little difference in reactivity as a function of oxidant type. However, a strong exothermic reaction in the smaller nickel-coated aluminum particles near the melting point of aluminum accelerates the reaction of the smaller particles. Explanation of the reactivity of the nickel-coated aluminum depending on the particle sizes is attempted.</P>
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Numerical modeling of a spherical buoy moored by a cable in three dimensions
Zhu, X.,Yoo, W. S. CHINA MACHINE PRESS/ SPRINGER VERLAG 2016 Chinese journal of mechanical engineering Vol.29 No.3
<P>Floating facilities have been studied based on the static analysis of mooring cables over the past decades. To analyze the floating system of a spherical buoy moored by a cable with a higher accuracy than before, the dynamics of the cables are considered in the construction of the numerical modeling. The cable modeling is established based on a new element frame through which the hydrodynamic loads are expressed efficiently. The accuracy of the cable modeling is verified with an experiment that is conducted by a catenary chain moving in a water tank. In addition, the modeling of a spherical buoy is established with respect to a spherical coordinate in three dimensions, which can suffers the gravity, the variable buoyancy and Froude-Krylov loads. Finally, the numerical modeling for the system of a spherical buoy moored by a cable is established, and a virtual simulation is proceeded with the X- and Y-directional linear waves and the X-directional current. The comparison with the commercial simulation code ProteusDS indicates that the system is accurately analyzed by the numerical modeling. The tensions within the cable, the motions of the system, and the relationship between the motions and waves are illustrated according to the defined sea state. The dynamics of the cables should be considered in analyzing the floating system of a spherical buoy moored by a cable.</P>
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