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기계식 가변밸브기구를 이용한 가솔린 압축착화엔진의 연비 개선에 관한 연구
신기욱(Kiuk Shin),권기영(Kiyoung Kwon),이원근(Wongeun Lee),김홍집(Hongjip Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
CAI (Controlled Auto-Ignition) combustion experiments were conducted with a four-stroke, naturally aspirated, single-cylinder gasoline engine. To realize CAI combustion, internal residual gas fraction was controlled by adjusting intake and exhaust valve lift and valve under-lap using the mechanically variable valve device. Fuel was injected during the valve under-lap period using the direct injection system. For the representative 5 part-load points, the fuel consumption and NOx emission benefits were evaluated.
CONSTRUCTION OF A DISASTER PREVENTION SYSTEM BASED ON WSN/GIS FOR URBAN SAFETY
Jeongeun Lee,Seonghyun Shin,Hyunsuk Hwang,Kiuk Kim,Changsoo Kim 한국멀티미디어학회 2007 한국멀티미디어학회 국제학술대회 Vol.2007 No.-
The disaster prevention systems still focus on its recovery more than the prevention of disaster events. As disaster events happen often and its loss becomes massive, the construction of disaster predication systems is essentially needed to keep safe urban. We propose a real-time monitoring system to prevent dangerous disaster events using Wireless Sensor Networks (WSN) and Geographic Information System (GIS). We construct wireless sensor nodes with gas sensors and temperature sensors and implement a prototype application to monitor the data transmitted from sensors. Also we implement the application based on GIS to do efficient management the location and sensors. Our contribution is to provide a prototype application of disaster prevention with real-time data on wireless sensor networks to keep safe urban.
Optogenetic control of body movements via flexible vertical light-emitting diodes on brain surface
Lee, Seung Hyun,Kim, Jeongjin,Shin, Jung Ho,Lee, Han Eol,Kang, Il-Suk,Gwak, Kiuk,Kim, Dae-Shik,Kim, Daesoo,Lee, Keon Jae Elsevier 2018 Nano energy Vol.44 No.-
<P><B>Abstract</B></P> <P>The microstimulation of specific neural populations of the brain is one of the facile and reliable methods used in neuroscience for deduction of functional movement, complex behavior and even long-range connectivity. Recent advanced biomedical tools now employ flexible optoelectronic devices combined with optogenetic mouse models to induce high spatiotemporal modulation of specific brain activity. However, most current applications are limited to activation of small functional regions using blue-light driven channelrhodopsin. In this report, we introduce flexible AlGaInP vertical light-emitting diodes (VLEDs) for perturbation of specific functional areas of mouse cortex. Micro-scaled LEDs effectively compress the conductive balls dispersed in anisotropic conductive film (ACF) resulting red light emissions with high optical power density, capable of stimulating motor neurons deep below layer III from the brain surface. Selective operation of pulsed red light from f-VLEDs induces mouse body movements and synchronized electromyogram (EMG) signals. The expression of chrimson, red-shifted channelrhodopsin, enables red-light excitation of targeted functional area of motor cortex. This demonstration opens new opportunities for entire cortical mapping, to explore the connectivity between undefined motor areas in the mouse brain.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The flexible vertical light-emitting diodes (f-VLEDs) were fabricated by an anisotropic conductive film (ACF). </LI> <LI> The f-VLEDs showed the optical power density more than 25mW/mm<SUP>2</SUP>, enough to stimulate the motor neurons below layer III. </LI> <LI> The f-VLEDs illuminated the frontal motor cortex of the mouse to control the body movements with minimal tissue damage. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Hwang, Gunpil,Choi, Jong-Kwan,Yang, Jaehyeok,Lim, Sungmin,Kim, Jae-Myoung,Choi, Min-Gyu,Gwak, Kiuk,Jeon, Jinwoo,Choi, Il-Hwan,Park, Sol,Kim, Dae-Shik,Shin, Hee Sup,Bae, Hyeon-Min IEEE 2017 IEEE journal of solid-state circuits Vol.52 No.4
<P>This paper presents the first free-space optical transceiver IC for social, psychological brain-computer interface experiments with multiple mice. The proposed IC embedded in a head-mounted module (HMM) includes 8-channel neural recorder and a neural stimulator in order to record extracellular action potentials and local field potentials while injecting diverse waveforms of monophasic intracranial stimulation current into the medial forebrain bundle for the activation of the nervous system. The HMM implanted on a mouse transmits the neural recording data to an optical base station by using a mandatory 591/624-nm (amber/red) visible behavior tracking LED as an optical transmitter to save power. The HMM is controlled simultaneously via a 940 nm infrared optical downlink to reduce interference to the visible optical uplink. The proposed IC fabricated in a 0.18-mu m HV BCDMOS process consumes 90 mu W while achieving a 2.048-Mb/s transmission rate.</P>