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[디젤엔진부문] 노즐 및 Cam 변화에 따른 전자제어식 유니트인젝터 시스템의 성능 고찰
이재기(Jae-Ki Lee),김동인(Dong-in Kim),김명석(Myoung-suk Kim) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_1
The particulate meter.;(PM) can be reduced by improvements to the fuel injection equipment(FIE). The main requirement from the FIE is to provide high fuel injection pressures and an optimal nozzle design. This paper presents the electronic unit injector(EUI) system which has been designed to give high fuel injection pressure and electronically controlled injection timing and fuel quantity. An experimental study has been carried out on the Doowon EUI prototype with nozzle and cam profile variations.
이재기(Lee Jae-Ki) 국어국문학회 2005 국어국문학 Vol.- No.139
This article aims to analyse the correlation between scores of sub-areas in korean language on the basis of the datum of National Assessment of Educational Achievement in 2003(NAEA 2003) in korean language and supplementary korean language experimental test. The main theme of this article is as follows :<br/> 1) Correlation analysis between korean language's total score and its sub-areas' scores. 2) Correlation analysis among scores of sub-areas in korean language. 3) Correlation analysis among writing multiple-choice test score, writing performance-based test score, and writing experimental test score. 4) Correlation analysis among Korean language knowledge score, writing multiple-choice test score, and writing and literature performance-based test scores. 5) Correlation analysis among reading multiple-choice test score, literature multiple-choice test score, literature performance-based test score.<br/> The results of the analysis is as follows. First, correlations between korean language's total score and its sub-areas' scores are high. Second, correlations among the scores of sub-areas in korean language are high. Third, correlation between reading and literature scores is high, but correlation between listening and writing is low, and that of listening and Korean language knowledge is low too. Fourth, correlation between writing multiple-choice test score and writing performance-based test score is low. Fifth, correlation between reading multiple-choice test score and literature multiple-choice test score is high.
Ge mole fraction에 따른 SGOI MOSFET의 아날로그 특성
이재기(Jae Ki Lee),김진영(Jin Young Kim),조원주(Won Ju Cho),박종태(Jong Tae Park) 大韓電子工學會 2011 電子工學會論文誌-SD (Semiconductor and devices) Vol.48 No.5
본 연구에서는 SixGe1-x 버퍼층 위에 성장된 strained-Si에 Ge 농도에 따라 n-MOSFET를 제작하고 소자 제작 후의 열처리 온도에 따른 소자의 아날로그 성능을 측정 분석하였다. 전자의 유효 이동도는 Ge 농도가 증가함에 따라 증가하였으나 32%로 높을 때에는 열처리 온도에 상관없이 오히려 감소하는 것으로 측정되었다. 상온에서 Ge 농도가 증가함에 따라 증가 소자의 아날로그 성능 지수가 우수하였으나 32% 농도에서는 오히려 좋지 않았다. 고온에서 strained-Si의 전자 유효이동도 저하가 Si보다 심하기 때문 SGOI 소자의 아날로그 성능 저하가 SOI 소자보다 심한 것을 알 수 있었다. In this work, the analog performances of n-MOSFET fabricated on strained-Si/relaxed Si buffer layer with Ge mole fractions and thermal annealing temperatures after device fabrication have been characterized in depth. The effective electron mobility was increased with the increase of Ge mole fraction for all annealing temperatures. However the effective electron mobility was decreased at the Ge mole fraction of 32%. The analog performances were enhanced with the increase of Ge mole fraction at the room temperature but they were degraded at the Ge mole fraction of 32%. Since the degradation of the effective electron mobility of strained-Si layer is more significant than one of conventional Si layer at elevated temperature, the degradation of analog performances of SGOI devices were increased than those of SOI devices.
우리나라 公共部門 雇傭의 膨脹과 와그너法則(Wagner’s Law)
이재기(Jae-Ki Lee) 한국재정학회(구 한국재정·공공경제학회) 1996 재정논집 Vol.10 No.-
In most public finance liteature on empirical test of Wagner’s Law, government expenditure variable has largely been used as a measure of government size. This variable, however, contains some disadvantages as follows. First, which government expenditure variable should be used for testing of Wagner’s Law?; government consumption expenditure total expenditure(including capital expenditure and transfers), total expenditure excluding transfers, etc. Data of capital expenditure are unavailable in many countries. Second, in which terms should the expenditure be measured?; nominal or real. Employment variable, on the other hand, could circumvent these problems. In reality, moreover, government sector is generally more labor-intensive. In this context, the employment variable could be a better yardstick. This study, using employment data for the 1960s-1990s period shows that Wagner’s Law is still applicable to Korea. It colud lend an impetus to further investigations on Wager’s Law, using the employment data against other countries.
Spark Plasma Sintering 법으로 제조한 CoSb<sub>3</sub> Skutterudite계 열전소재의 n형 첨가제 효과
이재기,최순목,이홍림,서원선,Lee, Jae-Ki,Choi, Soon-Mok,Lee, Hong-Lim,Seo, Won-Seon 한국재료학회 2010 한국재료학회지 Vol.20 No.6
$CoSb_3$ Skutterudites materials have high potential for thermoelectric application at mid-temperature range because of their superior thermoelectric properties via control of charge carrier density and substitution of foreign atoms. Improvement of thermoelectric properties is expected for the ternary solid solution developed by substitution of foreign atoms having different valances into the $CoSb_3$ matrix. In this study, ternary solid solutions with a stoichiometry of $Co_{1-x}Ni_xSb_3$ x = 0.01, 0.05, 0.1, 0.2, $CoSb_{3-y}Te_y$, y = 0.1, 0.2, 0.3 were prepared by the Spark Plasma Sintering (SPS) system. Before the SPS synthesis, the ingots were synthesized by vacuum induction melting and followed by annealing. For phase analysis X-ray powder diffraction patterns were checked. All the samples were confirmed as single phase; however, with samples that were more doped than the solubility limit some secondary phases were detected. All the samples doped with Ni and Te atoms showed a negative Seebeck coefficient and their electrical conductivities increased with the doping amount up to the solubility limit. For the samples prepared by SPS the maximum value for dimensionless figure of merit reached 0.26, 0.42 for $Co_{0.9}Ni_{0.1}Sb_3$, $CoSb_{2.8}Te_{0.2}$ at 690 K, respectively. These results show that the SPS method is effective in this system and Ni/Te dopants are also effective for increasing thermoelectric properties of this system.
분산 소프트웨어 개발환경에 대한 확률 미분 방정식 모델을 이용한 최적 배포 문제
이재기,남상식,Lee Jae-Ki,Nam Sang-Sik 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.7a
최근 소프트웨어 개발은 client/server 시스템이나 웹 프로그래밍, 객체지향 개발, 네트워크 환경에 의한 분산개발 등 새로운 개발 형태로써 다양하게 적용되고 있다. 한편 소프트웨어 분산 개발에 대한 기술도 관심이 되고 있으며, 객체지향 개념이 확대되고 있다. 이러한 기술에 의한 개발 작업량의 대폭 삭감이나 소프트웨어 품질 및 생산 개선의 효과가 점차 증대되어 가는 추세로 향후 광범위한 분야에 분산된 다수의 워크스테이션에 의해 병행되어 개발된 객체(object)를 이용한 분산개발의 발전에 대해 고찰한다. 본 논문에서는 이러한 분산 소프트웨어 개발환경을 대상으로 확률미분방정식 모델에 의한 소프트웨어 최척 배포문제를 논한다. 과거에는 소프트웨어 개발 프로세스에 의한 출하 품질의 파악이나 시험 진도관리에 의한 신뢰성 평가를 행하는 접근방법(approach)에 의해 소프트웨어의 고장 발생 현상을 불확정 사상에 의해 확률, 통계적으로 취급하는 방법을 적용하였으나 본고에서는 fault 발견과정에서 계수에 의해 취급되는 비동차포아송과정(NHIPP: Non-Homogeneous Poisson Process) 에 의한 SRGM과 fault 발견 과정을 연속적으로 변동하는 확률 과정의 모델화된 확률 미분방정식 (SDE: stochastic differential equation)에 의한 SRGM을 제안하여 최적의 배포시기를 결정한다. 여기서 시험단계 및 운용단계에 발생하는 비용 요인으로부터 도출된 총 소프트웨어 비용을 최소로 하는 시험시간인 최적 배포시기를 구한다. 특히, 총 소프트웨어 비용의 확률분포를 고려하여 최적 배포시기의 신뢰 한계도 논한다. Recently, Software Development was applied to new-approach methods as a various form : client-server system and web-programing, object-orient concept, distributed development with a network environments. On the other hand, it be concerned about the distributed development technology and increasing of object-oriented methodology. These technology is spread out the software quality and improve of software production, reduction of the software develop working. Futures, we considered about the distributed software development technique with a many workstation. In this paper, we discussed optimal release problem based on a stochastic differential equation model for the distributed Software development environments. In the past, the software reliability applied to quality a rough guess with a software development process and approach by the estimation of reliability for a test progress. But, in this paper, we decided to optimal release times two method: first, SRGM with an error counting model in fault detection phase by NHPP. Second, fault detection is change of continuous random variable by SDE(stochastic differential equation). Here, we decide to optimal release time as a minimum cost form the detected failure data and debugging fault data during the system test phase and operational phase. Especially, we discussed to limitation of reliability considering of total software cost probability distribution.