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Password-Only Authenticated Three-Party Key Exchange with Provable Security in the Standard Model
Nam, Junghyun,Choo, Kim-Kwang Raymond,Kim, Junghwan,Kang, Hyun-Kyu,Kim, Jinsoo,Paik, Juryon,Won, Dongho Hindawi Publishing Corporation 2014 The Scientific World Journal Vol.2014 No.-
<P>Protocols for password-only authenticated key exchange (PAKE) in the three-party setting allow two clients registered with the same authentication server to derive a common secret key from their individual password shared with the server. Existing three-party PAKE protocols were proven secure under the assumption of the existence of random oracles or in a model that does not consider insider attacks. Therefore, these protocols may turn out to be insecure when the random oracle is instantiated with a particular hash function or an insider attack is mounted against the partner client. The contribution of this paper is to present the first three-party PAKE protocol whose security is proven without any idealized assumptions in a model that captures insider attacks. The proof model we use is a variant of the indistinguishability-based model of Bellare, Pointcheval, and Rogaway (2000), which is one of the most widely accepted models for security analysis of password-based key exchange protocols. We demonstrated that our protocol achieves not only the typical indistinguishability-based security of session keys but also the password security against undetectable online dictionary attacks.</P>
Eu Doping Effect on the Radiation Resistance in Bi₄Ge₃O_12(BGO) Scintillator
KIM, Junghwan,JIN, Byung Moon,YU, Nan-Ei,JOH, Soo-Young,KIM, Jung-Nam 동의대학교 기초과학연구소 1999 基礎科學硏究論文集 Vol.9 No.1
Bi₄Ge₃O_12(BGO) that is well known as a scintillator was grown by a Czochralski method. The Eu-doped BGO crystal has higher radiation resistance than the normal BGO crystal under the same irradiation condition. In order to understand a mechanism of radiation resistance in Eu-doped BGO, fluorescence lifetimes, radiation induced-absorption, excitation, emission, and thermoluminescence spectra were studied for the different doses and at different temperatures. It is found that the shallow electron trapping centers due to Eu^3+ ion and the charge transfer state of Eu^3+ ion are playing a key role to the enhanced radiation resistance in the Eu-doped BGO crystal.
차량 주행 시뮬레이션을 이용한 디젤 엔진 운전 변수 최적화
방정환(Junghwan Bang),민경덕(Kyoungdong Min),이수원(Suwon Lee),김현옥(Hyun-Ok Kim),박종남(Jong-Nam Park),임훈섭(Hun-Seob Lim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper engine response functions of performance and emission were made using a design of experiments and real engine experiment data. Using vehicle driving mode simulation (UDDS : Urban Dynamometer Driving Schedule) engine operating points were achieved and engine operating parameters were optimized in a specific vehicle test mode using an optimization algorithm.
Kuduck Kwon,Junghwan Han,Ilku Nam THE INSTITUTE OF ELECTRICAL ENGINEERS 2015 IEEE Microwave and Wireless Components Letters Vol. No.
<P>A new gain control methodology employing frequency-translated (FT) impedance property is proposed for RF amplifiers. By adaptively controlling the baseband impedance through the FT property, fine RF gain control can be achieved without degradation in the RF characteristics such as noise figure (NF), gain, input matching, and bandwidth. To verify the proposed method, a wideband receiver (RX) front-end (FE) with the fine RF gain control has been designed for 2G/3G/4G cellular applications. The implemented RX FE consists of a wideband capacitor cross-coupled common-gate low-noise amplifier, a 25% duty cycle passive mixer with baseband impedance array, a baseband transconductor with variable input capacitance, and a trans-impedance amplifier. The RX FE was fabricated in a 65 nm CMOS process. It has a conversion gain from 26 dB to 42 dB with 1 dB gain resolution, and achieves a minimum NF lower than 3.3 dB, out-of-band IIP3 of -2 dBm, and IIP2 of more than 56 dBm. It draws an average current of 14.8 mA from a 1.2 V supply voltage.</P>
공공기관의 모바일웹 서비스 제공 여부 및 모바일 표준 준수에 대한 실중 연구
문형남(Moon Hyung Nam),장선영(Jang Sunyoung),박정환(Park Junghwan),조기용(Cho Kiyoung) 한국IT서비스학회 2010 한국IT서비스학회 학술대회 논문집 Vol.2010 No.9
스마트폰 확산에 따라 모바일 웹사이트(모바일 웹, 모바일 홈페이지)에 대한 수요가 늘고 있으며, 민간 및 공공기관에서 모바일 홈페이지 서비스를 제공하는 사례가 늘고 있다. 숙명여자대학교 정책·산업대학원 e비즈니스전공(www.ubiztop.org), 웹 표준과 웹 접근성 전문 벤처기업인 웹발전연구소(www.roadeb.org), 웹과 모바일 개발 전문업체인 마중물소프트(www.mjmsoft.co.kr)가 공동으로 국내에서 처음로 중앙행정기관과 지방자치단체(광역, 기초)의 모바일 웹사이트 구축 여부를 조사하고, 이들 모바일 웹들이 표준을 잘 준수해서 이용에 불편이 없는지에 대해 W3C의 모바일OK(MobileOK) 체커를 이용한 테스트를 실시하였다. 그 결과 방송통신위원회가 83.6점으로 '1위'인 반면 청와대는 41.2점으로 '매우 미흡'한 것으로 나타났다.