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Gesture-recognizing hand-held interface with vibrotactile feedback for 3D interaction
Sangki Kim,Gunhyuk Park,Sunghoon Yim,Seungmoon Choi,Seungjin Choi IEEE 2009 IEEE TRANSACTIONS ON CONSUMER ELECTRONICS - Vol.55 No.3
<P>This article presents a hand-held interface system for 3D interaction with digital media contents. The system is featured with 1) tracking of the full 6 degrees-of-freedom position and orientation of a hand-held controller, 2) robust gesture recognition using continuous hidden Markov models based on the acceleration and position measurements, and 3) dual-mode vibrotactile feedback using both vibration motor and voice-coil actuator. We also demonstrate the advantages of the system through a usability experiment.</P>
Kim, Young Beom,Jeon, Jong Hun,Choi, Sangki,Shin, Jingyeong,Lee, Yunho,Kim, Young Mo Elsevier 2018 Science of the Total Environment Vol.615 No.-
<P><B>Abstract</B></P> <P>The objective of this study was to investigate reduction in antibiotic resistance genes (ARGs) via targeting solid waste in effluent from a flow-through aquaculture in South Korea. The level of suspended solids in the filtrates was approximately 12.5±2.3mg/L, corresponding to a removal efficiency of 68.8±5.7% irrespective of variations in the size of the filter pores. The total number of particles in the effluent was reduced to the lowest numbers of particles using a filter pore size of 25μm, corresponding to a removal efficiency of 40.3%. Among the 23 ARGs conferring resistance to tetracyclines, beta-lactam antibiotics, sulfonamides, quinolones, macrolides, florfenicol and multidrug, tetracycline resistance genes were the most prevalent with a relative abundance of 67.5%. Of eleven tetracycline resistance genes (<I>tetA</I>, <I>tetB</I>, <I>tetD</I>, <I>tetE</I>, <I>tetG</I>, <I>tetH</I>, <I>tetM</I>, <I>tetQ</I>, <I>tetX</I>, <I>tetZ</I>, <I>tetB</I>/<I>P</I>) analyzed, the relative abundance of <I>tetG</I> was the highest in the effluent. The removal efficiency of the total number of particles showed similar patterns to the removal efficiency of ARGs depending on the size of the filter pores. Levels of ARGs in the filtrates were reduced to approximately 60.5% of those of the ARGs in the effluents. With a filter pore size of 25μm, a maximum removal efficiency of 66.0% was achieved. In particular, the relative abundance of detected tetracycline resistance genes decreased only after passing through the filters, perhaps reflecting the presence of high quantities of tetracycline resistance genes in particles from the fish farm. Using Illumina sequencing based on a 16S rRNA gene, the dominant phyla were found to be <I>Bacteroidetes</I>, <I>Proteobacteria</I>, <I>Planctomycetes</I> and <I>Verrucomicrobia</I> in the effluent. Although the overall composition of the bacterial communities was not significantly changed via filtering tests, only the relative abundance of <I>Bacteroidetes</I> and <I>Proteobacteria</I> was changed. These results demonstrate that a filtering process in aquaculture facilities can be used to reduce solid waste as well as ARGs from aquaculture farms.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A filtering process removed solids and ARGs from effluent of a flow-through fish farm. </LI> <LI> Reduction in targeted ARGs was achieved by removing particles via filtration. </LI> <LI> Most of the reduction in ARGs resulted from reduction in <I>tet</I>. </LI> <LI> Composition of bacterial communities was not significantly altered via filtering. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
김상기(Sangki Kim) 21세기정치학회 2015 21세기 정치학회보 Vol.25 No.4
The change of North Korea's foreign policy is an important task of the international community. Although previous studies propose a possibility that foreign aid can change recipient countries' foreign policy, few studies empirically test the effect of aid on North Korea's foreign policy. This study empirically examines how official development assistances (ODA) of countries in the OECD development assistance committee influence North Korea's foreign policy preference. Through statistical analyses using the United Nations General Assembly voting data from 1991 to 2008 I find the following: 1) generally, aid to North Korea is unlikely to significantly influence the foreign policy similarity between a provider and North Korea; 2) major powers' aid also tends to fail to change North Korea's foreign policy preference; 3) Nordic countries are likely to make North Korea's foreign policy preference closer to their preference. The reasons for the results may be associated with the purpose of aid and North Korea's perception about international relations. While states' aid generally has political or strategic purposes rather than humanitarian goals, North Korea having a negative perception about ODA defies the providers' strategic actions. On the other hand, North Korea has a favorable perception about Nordic countries' aid seeking humanitarian goals, and thus friendly relationship between North Korea and Nordic countries forms and North Korea's foreign policy can change. The empirical findings of this study provides a policy implication that when aid to North Korea seeks humanitarian goals instead of political purposes, it can significantly contribute to the change of North Korea.
김상기(Sangki KIM),허인호(Inho HUR),사이토료헤이(Ryouhei SAITOU) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11
Recently, it has been required to be downsizing and weight reduction of automotive automatic transmissions. As a result, planetary carrier which is main transmission mechanism also has been required to have a compact and light weight for highly durable planetary gear. There are various failure modes of planetary gears used in the automatic transmission (refer to Table 1). And the design method of pitting and wear that occurs to tooth surface, and tooth root breakage has already been established as a conventional failure mode. However, for small module planetary gears, it has not been established clearly of design method for spalling (or case crash) failure modes yet. In this paper, we introduce a design method that can predict spalling life quantifiably that is considering not only existing parameters which are shear stress and residual stress but also considering tooth root stress newly.