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임성혁,임종국,김경환,최재하 ( S . H . Im,S . K . Rhim,K . H . Kim,J . H . Choi ) 한국열처리공학회 1997 熱處理工學會誌 Vol.10 No.3
The-steady-state creep mechanism and behavior of Zircaloy-4 used as cladding materials in PWR have been investigated in air environment over the temp. ranges from 600 to 645℃ and stress ranges from 4 to 7㎏/㎟. The stress exponents for the creep deformation of this alloy, n were decreased 4.81, 4.71, 4.64, and 4.56 at 600, 615, 630 and 645℃, respectively; the stress exponents decreased with increasing the temperature and got closer to about 5. The apparent activation energies, Q, were 62.1, 60.0, 57.9 and 55.4 ㎉/mole at stresses of 4, 5, 6, 7㎏/㎟, respectively; the activation energies decreased with increasing the stress and were close to those of volume self diffusion of Zr in Zr-Sn-Fe-Cr system. In results, it can be considered that the creep deformation for Zircaloy-4 was controlled by the dislocation climb over the ranges of this experimental conditions. Larson-Miller parameter, P, for the crept specimens was obtained as P=(T+460)(logt_r+23). The failure plane observed by SEM slightly showed up intergranular fracture at this experiment ranges. However, it was essentially dominated by the dimple phenomenon, which was a characteristics of the transgranular fracture.
맵 기반의 부분시간 공통 중간주파수 제거방식을 이용한 GNSS 신호의 상관 기법
임성혁(Sung-Hyuck Im),지규인(Gyu-In Jee) 제어로봇시스템학회 2008 제어·로봇·시스템학회 논문지 Vol.14 No.7
In this paper, we propose the efficient Doppler removal method using map-based partial-time common intermediate frequency removal technique. In the proposed algorithm, the 2-stage carrier removal process was used. First, the component of common intermediate frequency is removed. Next the component of Doppler was removed with averaging and approximation. For the evaluation of the proposed algorithm, The real-time software GPS Ll C/A-code receiver was implemented. When the proposed algorithms are used, 12 tracking channels with 3 track arm(early, prompt, late) is operated real-time on PC using a Intel Pentium-III 1.0GHz CPU. Also, the requirement of memory was less than 2Mhytes. The real-time software GNSS receiver using the proposed algorithms provides the navigation solution with below 10 meter rms error. Especially, in spited of using the various approximations for implementing the algorithms, the high sensitivity capability (able to track the weak signal with -159dBm) was achieved.
임성혁(Im, Sunghyuck),안종선(An, Jongseon),손은성(Son, Eunseong),이상우(Lee, Sangwoo),허문범(Heo, Moonbeom) 한국항공우주연구원 2017 항공우주산업기술동향 Vol.15 No.1
자동차는 인간의 삶에서 필수적인 도구이다. 하지만 복잡한 교통으로 인해 자동차를 운전하기 위해 소비하는 시간과 노령화에 따른 노인운전자의 증가는 편의와 안전이라는 부분에서 자동차의 효용성을 저하시키고 안전도를 위협하고 있다. 이를 극복하기 위해 자율주행자동차 기술이 개발되고 있고 일부 자율주행단계는 상용화되고 있는 상황이다. 본 논문에서는 현재 자율주행 및 위성항법 기술 현황에 대해 설명하고 자율주행에의 위성항법 적용사례에 대해 서술하였다. With the need of transport and mobilities, cities have evolved to be more and more automobile dependent. Although such changes have made our lives more comfortable, the safety issue is now raising new questions due to the significant increase of elderly drivers and traffic congestion. To overcome these problems, autonomous vehicle technologies are being introduced and emphasized, and efforts to adopt the innovative technologies in the industry and commercial sectors are also increasing. In this paper, we review the current status of autonomous vehicle technology and satellite navigation technology, along with examples where the satellite navigation is applied for autonomous vehicles.
LRF(Laser Range Finder) 거리와 반사도를 이용한 보행사 보호용 노면표시 검출기법 연구
임성혁(Sung-Hyuck Im),임준혁(Jun-Hyuck Im),유승환(Seung-Hwan Yoo),지규인(Gyu-In Jee) 제어로봇시스템학회 2012 제어·로봇·시스템학회 논문지 Vol.18 No.1
In this paper, a detection method of a pedestrian safety road marking was proposed. The proposed algorithm uses laser range and reflectivity of a range finder (LRF). For a detection of crosswalk marking and stop line, the DFT (Discrete Fourier Transform) of reflectivity and cross-correlation method between the reference replica and the measured reflectivity are used. A speed bump is detected through measuring an altitude difference of two LRFs which have the different tilted angle. Furthermore, we proposed a velocity constrained a detection method of a speed bump. Finally, the proposed methods are tested in on-line, on the pavement of a road. The considered road markings are wholly detected. The localization errors of both road markings are smaller than 0.4 meter.
실시간 GNSS 기만 시뮬레이터를 이용한 위성항법수신기에서의 기만 영향 분석
임성혁(Sung-Hyuck Im),임준혁(Jun-Hyuck Im),지규인(Gyu-In Jee),허문범(Mun-Beom Heo) 제어로봇시스템학회 2013 제어·로봇·시스템학회 논문지 Vol.19 No.2
In this paper, spoofing effects on a GNSS receiver were analyzed. The spoofer (spoofing device) was classified to two categories. One is an active spoofer and the other is a passive spoofer. The active spoofer was considered for analysis. For the analysis of spoofing effects on a GNSS receiver, a real-time GNSS spoofing simulator was developed. The simulator was consisted with two parts which are a baseband signal generation part and a RF up-conversion part. The first GNSS baseband signal was generated according to spoofing parameters such as range, range rate, GNSS navigation data, spoofing to GNSS signal ratio, and etc. The generated baseband signal was up-converted to GNSS L1 band. Then the signal transmitted to a GNSS signal. For a perfect spoofing, a spoofer knew an accurate position and velocity of a spoofing target. But, in real world, that is not nearly possible. Although uncertainty of position and velocity of the target was existed, the spoofer was operated as an efficient jammer.