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사운드 기반 진동 시스템을 위한 진동 패턴 에디터와 컨트롤러
오성진 (Sungjin Oh),조동현(Donghyun Cho),유용희(Yonghee You),성미영 (Mee Young Sung),전경구(Kyungkoo Jun) 한국HCI학회 2008 한국HCI학회 학술대회 Vol.2008 No.2
본 논문에서는 사운드 기반 진동 시스템을 위한 진동 패턴 에디터와 진동 패드를 제어하기 위한 컨트롤러를 개발한다. 사운드 기반 진동 시스템은 PC의 사운드 출력단자로부터 나오는 신호를 실시간으로 분석하여 다양한 진동 효과를 발생시키는 시스템이다. 이것은 사운드 분석을 위한 DSP 시스템, 사용자의 팔 등에 부착하여 진동을 전달하는 진동 패드, 그리고 이를 제어하는 컨트롤러로 구성된다. 진동 패턴 에디터에서는 패턴을 결정하는 요소를 진동소자 위치, 진동 시작시간, 지속시간, 세기의 네 가지로 정의하고, 이러한 패턴을 쉽고 빠르게 생성할 수 있는 GUI기반 사용자 인터페이스를 제공한다. 이렇게 정의된 패턴은 저장이 가능하여 재사용성이 높다. 또한 진동 패턴 데이터를 해석하여 진동 패드를 제어하는 컨트롤러 구조를 제안한다. 이 경우 진동 패턴에 따라 컨트롤러의 펌웨어를 수정해야 하는 불편함을 없앨 수 있다. In this paper, we develop a vibration pattern editor and a vibration pad controller for a sound-driven vibration system, which can generate diverse vibration effects in realtime by analyzing signals from the sound output of PC. It consists of a DSP system to analyze the sound, a wrist-wearable vibration pad, and its controller. For the vibration pattern editor, we define four elements to describe the pattern; the locations of vibrating elements, start time, duration, and vibration intensity. The editor provides a GUI through which users can create such patterns fast and easily, and store them for reuse. We also propose a pattern-interpreting controller. It is able to interpret patterns created by the editor and control the pad accordingly. It can avoid the need to change the controller firmware whenever desired patterns change.
Oh, Kyeongmin,Kang, Tae June,Park, Sungjin,Tucker, Michael C.,Weber, Adam Z.,Ju, Hyunchul Elsevier 2017 ELECTROCHIMICA ACTA Vol.230 No.-
<P><B>Abstract</B></P> <P>Designing and optimizing the flow-field structure for the liquid phase Br<SUB>2</SUB>/HBr electrolyte solution of H<SUB>2</SUB>/Br<SUB>2</SUB> redox flow batteries (RFBs) is important for improving cell performance. In this study, two electrolyte flow modes, i.e. the flow-by and flow-through modes, are simulated by using a three-dimensional H<SUB>2</SUB>/Br<SUB>2</SUB> RFB model. The model is first applied to real-scale H<SUB>2</SUB>/Br<SUB>2</SUB> cell geometries and then validated against the experimental polarization curves acquired using the two different flow modes. The model predictions compare well with the experimental data and further highlight the advantages of using the flow-through mode relative to the flow-by mode. Detailed multi-dimensional contours of the electrolyte flow velocity and key species distributions reveal that more uniform diffusion and stronger convective transport are achieved by using the flow-through mode, which alleviates the ohmic loss associated with charge transport in the Br<SUB>2</SUB> electrode.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hydrogen bromine RFB model is applied to 10cm<SUP>2</SUP> scale cell. </LI> <LI> The model is experimentally validated in the current density range up to 1.0Acm<SUP>−2</SUP>. </LI> <LI> Two different flow modes are numerically examined. </LI> <LI> The flow-through mode assures more uniform reactant profile than the flow-by mode. </LI> </UL> </P>
Oh, Junghoon,Lee, Jang Mee,Yoo, Youngjun,Kim, Jeongho,Hwang, Seong-Ju,Park, Sungjin Elsevier BV 2017 Applied Catalysis B Vol.218 No.-
<P><B>Abstract</B></P> <P>The development of efficient catalysts for hydrogen evolution reaction (HER) presents a huge technical challenge. Graphitic carbon nitride (g-C<SUB>3</SUB>N<SUB>4</SUB>) is a promising metal-free, low cost, environment-friendly photocatalyst for HER that is driven by visible light. In this work, the authors provide new insight into the photocatalytic natures of g-C<SUB>3</SUB>N<SUB>4</SUB> materials and their dependences on grain size, porosity, chemical structure, and photophysical properties. Three different precursors (urea, melamine, and dicyandiamide) and two gas atmospheres (air or N<SUB>2</SUB>) are used to produce various g-C<SUB>3</SUB>N<SUB>4</SUB> materials. The use of urea and air leads to the formation of small grain C<SUB>3</SUB>N<SUB>4</SUB> networks and porous structures with large surface areas. HER catalytic activity is promoted by large surface areas and the presence of terminal amine groups, and generation of small-sized Pt nanoparticle co-catalysts with narrow size distribution on the surface of g-C<SUB>3</SUB>N<SUB>4</SUB>. For samples with similar surface areas, band gaps and lifetimes of photogenerated charge carriers critically determine photocatalytic activities. By examining combinations of the above-mentioned factors, urea driven g-C<SUB>3</SUB>N<SUB>4</SUB> produced in a N<SUB>2</SUB> atmosphere is found to exhibit the best photocatalytic activity (up to 130μmolh<SUP>−1</SUP> g<SUP>−1</SUP>).</P> <P><B>Highlights</B></P> <P> <UL> <LI> Grain size of basic units in g-C<SUB>3</SUB>N<SUB>4</SUB> was controlled by synthetic conditions. </LI> <LI> C<SUB>3</SUB>N<SUB>4</SUB> with small grain showed better photocatalytic activities for hydrogen evolution. </LI> <LI> Thermal treatment of urea in N<SUB>2</SUB> produced g-C<SUB>3</SUB>N<SUB>4</SUB> with the highest catalytic activity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Oh, Junghoon,Chang, Yun Hee,Kim, Yong-Hyun,Park, Sungjin The Royal Society of Chemistry 2016 Physical chemistry chemical physics Vol.18 No.16
<P>Photocatalysts use sustainable solar light energy to trigger various catalytic reactions. Metal-free nanomaterials have been suggested as cost-effective and environmentally friendly photocatalysts. In this work, we propose thickness-controlled graphite oxide (GO) as a metal-free photocatalyst, which is produced by exfoliating thick GO particles via stirring and sonication. All GO samples exhibit photocatalytic activity for degrading an organic pollutant, rhodamine B under visible light, and the thickest sample shows the best catalytic performance. UV-vis-NIR diffuse reflectance absorption spectra indicate that thicker GO samples absorb more vis-NIR light than thinner ones. Density-functional theory calculations show that GO has a much smaller band gap than that of single-layer graphene oxide, and thus suggest that the largely-reduced band gap is responsible for this trend of light absorption.</P>
Domain Name Autoconfiguration in IP-based Wireless Sensor Networks
Sungjin Park,Seongkyun Oh,Seok Lee,Sun Ho Kim,Hyung Seok Kim 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
This paper provides a method for domain name autoconfiguration capable of enabling a user easily to obtain information on a sensor in a desired area through the Internet in a wireless sensor network using an IP address and enabling a domain name to be automatically set and registered without additional setting of a network operator by using the domain name of a new system for simply representing a type and a geographical position of the sensor.