http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
비선형 유한요소해석 프로그램을 이용한 차체 구조물의 동강성 및 정강성 해석
김성현(Sunghyun Kim),김형일(Hyungil Kim),변형배(Hyungbai Byun),김동석(Dongseok Kim),이용훈(Yonghoon Lee),김일환(Ilhwan Kim),허승진(Seung Jin Heo),임홍재(Hong Jae Yim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In this study, dynamic stiffness analysis and static stiffness analysis were conducted by using nonlinear finite element analysis program and linear finite element analysis respectively to compare the results and to confirm reliability about results of nonlinear finite element analysis program. First, dynamic stiffness analysis has been performed on side out panel, crash box, sub-frame and BIW(Body In White) that has been connected with front bumper, rear bumper and sub-frame. Second, static stiffness analysis has been conducted on crash box and hood that has been modeled with spot weld elements and rigid body elements. Consequently, differences of dynamic and static stiffness analysis results through nonlinear finite element analysis program and linear finite element analysis were below 6 % but difference was more than 6 % as to dynamic stiffness of BIW.
New Watermarking Technique Using Data Matrix and Encryption Keys
Ilhwan Kim,Chang-Hee Kwon,Wangheon Lee 대한전기학회 2012 Journal of Electrical Engineering & Technology Vol.7 No.4
Meaningful logos or random sequences have been used in the current digital watermarking techniques of 2D bar code. The meaningful logos can not only be created by copyright holders based on their unique information, but are also very effective when representing their copyrights. The random sequences enhance the security of the watermark for verifying one’s copyrights against intentional or unintentional attacks. In this paper, we propose a new watermarking technique taking advantage of Data Matrix as well as encryption keys. The Data Matrix not only recovers the original data by an error checking and correction algorithm, even when its high-density data storage and barcode are damaged, but also encrypts the copyright verification information by randomization of the barcode, including ownership keys. Furthermore, the encryption keys and the patterns are used to localize the watermark, and make the watermark robust against attacks, respectively. Through the comparison experiments of the copyright information extracted from the watermark, we can verify that the proposed method has good quality and is robust to various attacks, such as JPEG compression, filtering and resizing.
Kim, Soo Jeong,Ryu, Min Jeong,Han, Jeongsu,Jang, Yunseon,Kim, Jungim,Lee, Min Joung,Ryu, Ilhwan,Ju, Xianshu,Oh, Eungseok,Chung, Woosuk,Kweon, Gi Ryang,Heo, Jun Young Academic Press 2017 Biochemical and biophysical research communication Vol. No.
<P><B>Abstract</B></P> <P>The derangement of tyrosine hydroxylase (TH) activity reduces dopamine synthesis and is implicated in the pathogenesis of Parkinson's disease. However, the extracellular modulator and intracellular regulatory mechanisms of TH have yet to be identified. Recently, high-mobility group box 1 (HMGB1) was reported to be actively secreted from glial cells and is regarded as a mediator of dopaminergic neuronal loss. However, the mechanism for how HMGB1 affects TH expression, particularly through the receptor for advanced glycation endproducts (RAGE), has not yet been investigated. We found that recombinant HMGB1 (rHMGB1) upregulates TH mRNA expression via simultaneous activation of JNK phosphorylation, and this induction of TH expression is blocked by inhibitors of RAGE and JNK. To investigate how TH expression levels change through the HMGB1-RAGE axis as a result of MPP<SUP>+</SUP> toxicity, we co-treated SN4741 dopaminergic cells with MPP<SUP>+</SUP> and rHMGB1. rHMGB1 blocked the reduction of TH mRNA following MPP<SUP>+</SUP> treatment without altering cell survival rates. Our results suggest that HMGB1 upregulates TH expression to maintain dopaminergic neuronal function via activating RAGE, which is dependent on JNK phosphorylation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Activation of HMGB1-RAGE stimulates the TH expression in dopaminergic neuron cells. </LI> <LI> HMGB1 regulates TH expression via phosphorylation of JNK. </LI> <LI> HMGB1 rescues the TH expression without alteration of cell viability in MPP<SUP>+</SUP> treated dopaminergic neuron cells. </LI> </UL> </P>
네트워크 코딩을 활용한 가상 다중 안테나 시스템 기반 차량용 협력 통신 기술
김일환(Ilhwan Kim),김정현(Junghyun Kim),지순배(Soonbae Ji),유철우(Cheolwoo You) 대한전자공학회 2015 전자공학회논문지 Vol.52 No.4
본 논문은 차량 간 이동 네트워크의 협력통신을 제안하고 차량 간 다중 페이딩 환경에서 고속 전송 효율성과 범위 확장을 위한 네트워크 코딩(Network coding) 기법을 제안한다. 또한 시뮬레이션 결과를 보면 제안된 전략이 가상 다중 안테나 시스템(virtual MIMO)을 설정해줌으로써 수신단에서 다이버시티 이득을 얻을 수 있다. 또한, 공간 다이버시티의 장점을 활용하여, Signal-to-Noise Ratio(SNR)을 향상시킨다. 기존 전략과 비교해보면 Inter Symbol Interference(ISI)와 Inter Channel Interference(ICI)가 완화될 뿐만 아니라 성능이 3dB만큼 훨씬 더 좋아진 결과를 확인할 수 있다. 본 논문에서는 연구의 타당성을 보이기 위해 MATLAB을 이용한 Ultra-Wideband(UWB) 통신 시스템의 시뮬레이션을 제시한다. In this paper, we propose a cooperative vehicle communication scheme for high transmission efficiency and coverage extension under multipath fading environment of moving vehicle networks. The proposed scheme uses a Network coding scheme for improvement of receiving performance by using virtual Multiple-Input Multiple-Output(MIMO) transmit diversity. Simulation results have shown that the proposed scheme also provides alleviated Inter Symbol Interference(ISI) and Inter Channel Interference(ICI) as well as Signal-to-Noise Ratio(SNR) improvement and improve 3dB compared to the conventional scheme, since it can utilize the good properties of spatial diversity and coding gain by using virtual MIMO configuration. In this paper, we propose simulations of Ultra-Wideband(UWB) communication system to show validity by using the MATLAB.
개인정보보호법상 목적구속원칙의 의의와 내용에 관한 연구
김일환(Kim, Ilhwan) 미국헌법학회 2014 美國憲法硏究 Vol.25 No.3
개인정보보호에 관한 국제적, 국내적 기준에서 반드시 강조되는 원칙이 바로 규범명확성원칙과 목적구속원칙이다. 위에서 이미 설명된 것처럼 규범명확성원칙이란 자신에 관한 정보가 어떤 구체적인 처리목적들을 위하여 필요한지를 해당 개인이 명확하게 인식할 수 있어야만 한다는 것을 뜻한다. 따라서 법률의 규범명확성, 조직적이고 절차법적인 예방책들, 관할기관들의 통지의무, 관련자의 포괄적인 설명청구권 등을 통하여 누가, 언제, 어디에서 어떤 경우에 자기에 관하여 아는지를 관련 개인이 알 수 있도록 보장되어야 한다. 특히 관련자가 법규정으로부터 그의 개인정보가 어떤 구체적인 행정목적을 위하여 필요한지를 명백히 인식할 수 있어야만 한다. 또한 정보처리의 목적구속은 한편으로는 처리목표를 확정하고 다른 한편으로는 처리범위를 한정한다. 처음부터 명확하게 개념정의할 수 있는 목적을 위하여 필요한 최소한도의 정보처리만이 허용된다. 따라서 이미 법률상 결정된 목적을 위해서만 개인정보는 이용되어도 된다. 목적과는 다른 정보이용 및 처리는 매우 제한된 범위 내에서만 인정되고 법률상 근거를 필요로 하는 새로운 기본권제한이다. 결국 이는 목적구속을 보장하기 위하여 국가기관간 정보전달과 이용에 관한 엄격한 대비책을 필요로 한다는 것을 뜻한다.