• 한국광학회:학술대회논문집
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• 한국광학회 2002년도 하계학술발표회
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• pp.76-77
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• 2002

본 논문은 안과진료에 사용되는 3차원 망막영상 측정장비에 관한 것으로, 광학설계 프로그램(CODE-V)을 이용하여 망막영상에 대한 최적 설계를 검토하였다. 영상을 평면화 및 3차원화하여 보다 실제에 근접하게 하는 연구는 지속적으로 진행되고 있으며, 이러한 결과가 실제 적용되어 유용하게 사용되고 있다. 현재 안과에서 안구의 망막을 측정하는 대표적인 영상장비로 SLO가 있으며, 2차원의 망막영상이 모니터를 통해 보여지고, 환자의 망막영상을 보다 정밀하게 진단하고 있다. (중략)

• 대한용접접합학회:학술대회논문집
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• 대한용접접합학회 1999년도 특별강연 및 춘계학술발표대회 개요집
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• pp.141-142
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• 1999

• Nuclear Engineering and Technology
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• 제53권7호
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• pp.2104-2125
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• 2021

This paper presents the verification and validation (V&V) of a calculation module for isotope inventory prediction to control the back-end cycle of spent nuclear fuel (SNF). The calculation method presented herein was implemented in a two-step code system of a lattice code STREAM and a nodal diffusion code RAST-K. STREAM generates a cross section and provides the number density information using branch/history depletion branch calculations, whereas RAST-K supplies the power history and three history indices (boron concentration, moderator temperature, and fuel temperature). As its primary feature, this method can directly consider three-dimensional core simulation conditions using history indices of the operating conditions. Therefore, this method reduces the computation time by avoiding a recalculation of the fuel depletion. The module for isotope inventory calculates the number densities using the Lagrange interpolation method and power history correction factors, which are applied to correct the effects of the decay and fission products generated at different power levels. To assess the reliability of the developed code system for back-end cycle analysis, validation study was performed with 58 measured samples of pressurized water reactor (PWR) SNF, and code-to-code comparison was conducted with STREAM-SNF, HELIOS-1.6 and SCALE 5.1. The V&V results presented that the developed code system can provide reasonable results with comparable confidence intervals. As a result, this paper successfully demonstrates that the isotope inventory prediction code system can be used for spent nuclear fuel analysis.

• 대한전자공학회논문지SD
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• 제41권4호
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• pp.83-90
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• 2004

본 논문은 메모리 크기의 제약을 많이 받는 내장형 마이크로프로세서의 문제를 해결하기 위해 32-bit 명령어와 24-bit, 16-bit 명령어를 혼합 사용하여 3가지 명령어 모드를 갖는 새로운 명령어 셋(X32V ISA)을 제안하였으며, 이를 기반으로 32-bit 5 stage pipeline RISC 마이크로프로세서를 설계하였다. 이를 검증하기 위해서 X32V ISA 전용 시뮬레이터를 이용하여 멀티미디어 프로그램의 프로그램 코드 사이즈를 산출하였다. 그 결과로 Light mode와 Ultra light mode는 Default mode에 비해 각각 최소 8%, 27%의 프로그램 코드 사이즈 감소를 확인하였으며, Xilinx FPGA를 이용하여 33MHz 동작 환경에서 X32V ISA의 모든 명령어 수행을 검증하였다.

• 대한기계학회논문집B
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• 제33권8호
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• pp.622-628
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• 2009

The TEXAS-V code tuned for TROI-13 was used for analyzing the parametric findings in TROI experiments. The calculations on the melt composition are relatively similar to the TROI experimental results. The water depth effect in TEXAS-V code seems to be consistent with TROI experiments in some degree. The water area effect of TEXAS-V calculations seems not to be harmonious to that in TROI experiments. This seems to indicate that TEXAS-V as 1-dimensional code or as the numerical steam explosion has a limitation on estimating area effect. Thus, TEXAS-V tuned for TROI-13 seems to have an ability to estimate the parametric effect of TROI experiments. The evaluated TEXAS-V was used for estimating the ex-vessel steam explosion load. The calculated explosion pressure and load were about 40 MPa and 75 kPa.sec, which are not much threatening level for containment integrity.

• 전기학회논문지
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• 제64권5호
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• pp.746-750
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• 2015

In this paper, we propose a simulator to evaluate the performance of the semi-active laser guidance or the quadrant photodetector and to simulate the laser power reflected from a target. The laser pulse repetition frequency was generated and synchronized with the laser pulse repetition(PRF) code. To evaluate the performances of the proposed methods, we implemented a prototype system and performed experiments. As a result, the generated high voltage was variable in the range of DC 3V to 340V and has the rate of change of 2000 V/s. PRF code can be generated within 50ms ∼ 100ms and the error is implemented within 0.3ns. The laser output is synchronized with the PRF code and has a dynamic range of 23.6dB.

• 한국자동차공학회논문집
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• 제12권3호
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• pp.51-58
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• 2004

Optimization of engine desist and operation parameters using a genetic algorithm was demonstrated for direct injection diesel engine combustion. A micro genetic algorithm and a modified KIVA-3V code were used for the analysis and optimization of the engine combustion. At each generation of the optimization step the micro genetic algorithm generated five groups of parameter sets, and the five cases of KIVA-3V analysis were to be performed either in series or in parallel. The micro genetic algorithm code was also parallelized by using MPI programming, and a multi-CPU parallel supercomputer was used to speed up the optimization process by four times. An example case for a fixed engine speed was performed with six parameters of intake swirl ratio, compression ratio, fuel injection included angle, injector hole number, SOI, and injection duration. A simultaneous optimization technique for the whole range of engine speeds would be suggested for further studies.

• Nuclear Engineering and Technology
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• 제35권4호
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• pp.286-298
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• 2003

A steam explosion module, STX, has been developed using the mechanistic steam explosion analysis code, TEXAS-V, in order to estimate the dynamic load with steam explosion by implementing the module to the integrated safety analysis code, MELCOR. One of the difficulties in using mechanistic steam explosion codes is that they do not have any obvious criteria for defining some uncertain parameters such as triggering timing, triggering magnitude, mesh axial length and mesh cross-sectional area. These parameters have been user decision parts in the past. Steam explosion sample calculations and sensitivity studies on uncertain parameters were conducted to investigate those uncertain parameters. The TEXAS-V simulations were summarized in the format of a look-up table and a linear interpolation technique was adopted to calculate the steam explosion load between the data points in the table. The STX-module merged with MELCOR showed the same results as the original MELCOR and additionally it could estimate the steam explosion load in the reactor cavity.

• 융합보안논문지
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• 제11권6호
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• pp.37-44
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• 2011

VANET(Vechicular Ad-hoc Network)은 지능형 차량들로 이루어진 애드혹 네트워크 환경으로서 최근 들어 그 연구가 활발하게 진행되고 있는 분야이다. VANET은 원활한 교통 소통, 사고 방지 등 여러 가지 편리한 기능들을 제공하지만 그 기반을 애드혹 네트워크에 두고 있기 때문에 애드혹 망에서 발생하는 보안 문제를 가지고 있고 또한 그 환경적 특성에 따라 추가적인 보안 요구 사항이 존재한다. 본 논문에서는 오류수정부호(Error Correcting Code)의 생성행렬을 사용하여 부호화된 인증서를 생성하고 이를 기반으로 차량의 익명성과 비연결성을 제공하는 V2I(Vehicular to Interface) 인증 프로토콜을 제안한다. 또한 기존 방식에서 차량 등록 및 인증 서버(KDC)의 차량 비밀 키 관리에 대한 오버헤드 문제를 해결하게 되었다.

• Nuclear Engineering and Technology
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• 제32권4호
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• pp.361-371
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• 2000

The 123Te(p,n)123I, 124Te(p,n)124I and 124Te(p,2n)123I reactions, among the many reaction channels opened, are the major reactions under consideration from a diagnostic purpose because reaction residuals as the gamma emitters are used for most radiophamaceutical applications involving radioiodine. Based on the available experimental data, the absorption cross sections and elastic scattering angular distributions of the proton-induced nuclear reaction on Te isotopes below 60 MeV are calculated using the optical model code APMNK. The transmission coefficients of neutron, proton, deuteron, trition and alpha particles are calculated by CUNF code and are fed into the GNASH code. By adjusting level density parameters and the pair correction values of some reaction channels, as well as the composite nucleus state density constants of the pre-equilibrium model, the production cross sections and energy-angle correlated spectra of the secondary light particles, as well as production cross sections and energy distributions of heavy recoils and gamma rays are calculated by the statistical plus pre-equilibrium model code GNASH. The calculated results are analysed and compared with the experimental data taken from the EXFOR. The optimized global optical model parameters give overall agreement with the experimental data over both the entire energy range and all tellurium isotopes.