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High-Efficiency Cu(In,Ga)Se<sub>2</sub> Thin Film Solar Cells Using ZnS and CdS Buffer Layers
Jun, Byoung-Min,Kim, Geunho,Kim, Eundo,Kim, Heecheol,Lee, Dong Ju,Kim, Han-Sang,Choi, Seong Gon,Shan, Fei,Kim, Sung-Jin American Scientific Publishers 2019 Journal of Nanoscience and Nanotechnology Vol.19 No.3
A New High Performance Wirelss Indoor LAN Modem for the Multimedia Communication
Kim,GeunHoe,Kwon,SungWoo,Kye,SunHyung,Seoh,JongSoo,Lee,MoonKey THE RESEARCH INSTITUTE OF ASIC DESIGN YONSEI UNIVE 1998 Journal of the Research Institute of ASIC Design Vol.5 No.1
We present an implementation of a new wireless LAN modem that combines 64 QAM modulation with OFDM to improve data transmission rate from 2Mbps to 6Mbps. ITU 802.11 standard for ISM 2.4GHz wireless LAN band defines 3 different implementations : namely, FHSS(Frequency Hopping Spread Spectrum), DSSS(Direct Sequence Spread Spectrum), and Infrared. However, with the advent of multimedia communication, those e methods no longer satisfy the demand of QOS(Quality Of Service) for multimedia communication. Hence we design the new modem that combines 64 QAM modulation with OFDM. The modem has 128 subcarriers, 10 guard symbols and 8 pilot symbols. Those values of parameter are determined based upon the simulations through SPW. In fact, architectures of transmitter/receiver and most of submodules are modeled in SPW first and then implemented into hardware. In this way, we are able to develop new channel distortion compensation technique and synchronization technique to guarantee orthogonality of subcarriers in the receiver. In fact, many submodules such as dummy symbol generation block, 64 QAM encoder, and IFFT/FFT have unique low hardware complexity structures. The modem is implemented in FPGA and has 10?? SER at 28.3 dB SNR.
시금치 분말 및 농축액의 첨가 급여 수준이 난황 내 루테인 함량에 미치는 영향
강근호(Geunho Kang),김상호(Sangho Kim),김지혁(Jihyuk Kim),강환구(Hwanku Kang),김동욱(Dongwook Kim),나재천(Jaecheon Na),서옥석(Oksuk Suh),조수현(Soohyun Cho),성필남(Pilnam Seong),박범영(Beomyoung Park),장애라(Aera Jang),강선문(Sunmoon Ka 韓國家禽學會 2012 韓國家禽學會誌 Vol.39 No.1
This study was conducted to investigate the effect of dietary supplementation levels of spinach powder and extract on performance, egg quality and lutein content in egg yolk. Laying hens were subjected to one of the following treatments; C, basal diet (BD); T1, BD + 1 ppm lutein from spinach powder; T2, BD + 1 ppm lutein powder from spinach extract; T3, BD + 2 ppm lutein powder from spinach extract; T4, BD + 2 ppm lutein from spinach extract. As a result, performance of laying hens was no significant difference among treatments. T4 had a significantly (p<0.05) higher egg yolk color than the other treatments. As from the lutein content in egg yolk, T4 had a significantly (p<0.05) higher content than the other treatments. Finally, these results suggested that the dietary supplementation for lutein-rich egg production, lutein concentration must be higher than a minimum of 2 ppm. Also, dietary with lutein extract from raw materials was appropriate for lutein-rich egg production than dietary with raw materials.
시내버스용 기계-유압식 무단변속기(CVT)의 설계기술 연구
이근호(Geunho Lee),김형의(Hyoungeui Kim),김도식(Dopsik Kim),정동수(Dongsu Jeong) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Hydro-mechanical type CVT(Continuous Variable Transmission) developed for heavy and high power propulsion vehicle changes the speed by regulating the swash plate on the hydraulic pump & motor as variator. Therefore it is possible to generate high torque at low speed and to obtain the high power density as characteristics of hydraulic variator. To reduce the disadvantages of hydraulic pump & motor like as low efficiency and noisy problem, some parts of power could transfer by gear train. In this study, the application vehicle of hydro-mechanical type CVT is the city bus showing frequent stops and requiring the safe and smooth drivability because of standing passengers. The advantages of hydro-mechanical type CVT for city bus are the reduction of harmful exhaust gas by control the diesel engine as a constant at optimal operating speed and the offer the safe and comfortable drivability without shifting impact. Thus. the purpose of this study is proposed the direction of concept design that is essentially necessary for development of transmission and optimal methodology about design parameters and factors.<br/>
차량도어 래치스프링의 형태모수 수정을 이용한 보증수명 추정
이근호(Geunho Lee),김형의(Hyoungeui Kim),김도식(Dosik Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This study was performed to develop the assurance life prediction method using modification of shape parameter for the latch spring of vehicle door. The shape parameter f3 is one of main parameter with scale parameter, number of sample, confidence level, to determine the predicted assurance life and testing time. The proposed the modification of shape parameter is an approach to verify the life prediction procedures based on the life testing data and to improve the reliability assessment on the statistical distribution. The latch spring generally represent fatigue and fracture characteristics as a failure mode. Firstly, life distribution of latch spring was supposed to follow Weibull distribution and life test time was calculated under the conditions of average life (B?) 300,000 cycles and 95 % confidence level for 60 test samples with value of shape parameter 2.07 from reference data. Secondly, after the life test until to acquire all sample failure, the value of shape parameter 2.26 can be obtained by analyzing the using MINITAB. Finally, the assurance life of latch spring could be predicted by the relation of mean life and the scale parameter which is achieved also from the analysis of sample failure data.