오차보정기능을 갖는 10비트 D/A 변환기

김욱,양정욱,김민규,김석기,김원찬,Kim, Ook,Yang, Jung-Wook,Kim, Min-Kyu,Kim, Suk-Ki,Kim, Won-Chan 대한전자공학회 1994 전자공학회논문지-A Vol.31 No.6

To realize high accuracy and high speed we developed a new self compensation scheme and applied it to a 10-bit D/A converter. This circuit can compensate the device mismatch without interrupting the D/A converter operation. With the compensation circuit,INA decreased down to 0.22LSB from 0.47LSB. The device was fabricated using a 0.8$\mu$m CMOS process. The area of the D/A converter core is 3.2mm$^{2}$ and the area of the compensation part is 0.64mm$^{2}$.

연구보문 : 풋옥수수 수확 후 예냉처리와 저온저장에 따른 품질 변화

김정태 ( Jung Tae Kim ),허온숙 ( On Sook Hur ),김선림 ( Sun Lim Kim ),김미정 ( Mi Jung Kim ),손범영 ( Beom Young Son ),이진석 ( Jin Seok Lee ),백성범 ( Seong Bum Baek ),서세정 ( Sea Jung Seo ),김욱한 ( Wook Han Kim ) 한국국제농업개발학회 2011 韓國國際農業開發學會誌 Vol.23 No.1

Quality attributes of fresh waxy corn (Zea mays L.) as affected by pre-cooling and storage temperature (4˚C and room temperature) were investigated in terms of weight loss, moisture, color, reducing sugar content, and sensory quality. Two varieties of waxy corn with white and black kernel color, Ilmichal and Heukjinjuchal respectively, were cultivated at the field of National Institute of Crop Science in 2007 and 2008 to determine the physiologically optimal storage condition for higher eating quality stored in refrigerator of 4˚C and room temperature. They are pre-cooled immediately after harvest with ice for 5 hours. Quality analyses were monitored during 10 days at 4˚C storage room comparing with those of non cooled and stored at room temperature. A higher weight loss over 15% observed in both of two waxy corn varieties that were stored at room temperature. But there was not significantly difference with variety or pre-cooling treatment. There was up to 10% increase in moisture content in kernels non pre-cooled and stored at room temperature. For all treatments, very small amount of free sugar were detected, however, there were no significant differences between treatments. Glucose concentration increased with time in kernels stored at 4˚C and the effect of pre-cooling was not significant. A general darkening in color of kernels and a trend to turn yellow was observed in the pre-cooled corns when they were steam-cooked. Total sensory scores of corns stored in 4˚C were better than those of samples stored in room temperature and there was not significantly difference with variety or pre-cooling treatment. As storage period was longer, shelf lifes of waxy corn in control and waxy corn treated with technique applied to store waxy corn, and the quality of waxy corn could be maintained and the storage expense could be saved during storage. It is required that further studies narrow down the effect of pre-cooling on fresh waxy corn during short time storage.

BCNF 릴레이션 생성에 관한 연구

김욱,한상만,송영기,Kim, Uk,Han, Sang-Man,Song, Yeong-Gi 한국전자통신연구원 1987 전자통신 Vol.9 No.3

주어진 릴레이션 스킴(relation scheme)을 이에 관련된 함수적 종속(functional dependency)들을 가지고 분해하여 Boyce-Codd 정규형(Boyce-Codd normal form)에 속하는 릴레이션 스키머(schema)로 정규화(normalization)시키는 기존의 분해 알고리즘(decomposition algorithm)은 구현해서 사용하기에 적합하지 못하다. 본 고에서는 기존의 알고리즘 구현시 발생하는 문제점을 분석하고 이런 문제점을 해결하는 방법을 제시하며, 이를 토대로 Boyce-Codd 정규형 릴레이션 스킴을 생성하는 새로운 알고리즘을 제시하고, 이 알고리즘을 UNIX 환경하에 C 언어로 구현한 후 임의의 자료를 수행하여 얻어진 릴레이션 스키머와 기존의 알고리즘에 의해 얻어진 릴레이션 스키머를 비교분석하였다.

2중관형 2상 열사이폰의 한계열유속 특성에 관한 연구

김욱,Kim, Wook 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.10

An experimental study was made to elucidate critical heat flux(CHF) characteristics in a two-phase concentric-tube thermosyphon. The experiment was performed by using saturated water, over the experimental range of configuration: inner diameter of heated outer tube D=12mm, outer diameter of unheated inner tube do=3 to 10mm and heated tube length L=100 to 1000mm. The experiment shows that the CHF is enhanced with increase in the inner tube diameter, and that the CHF decreases beyond a certain diameter of the inner tube. There is an optimum diameter for inner tube that maximizes the CHF, for each tube length and test liquid. The CHF maximum is about two to eight times as large as that without an inner tube. For a large inner tube, the CHF characteristics is similar to that for natural convective boiling in a vertical annular tube.

직장의 인간학

김욱,Kim, Uk 기술표준원 2002 기술표준 Vol.3 No.-

인류집단의 진화와 Y 염색체 DNA 변이

김욱,Kim, Wook 한국통합생물학회 1999 한국동물학회 뉴스레터 Vol.16 No.2

기술자문 사례

김욱,Kim, Uk 기술표준원 2002 기술표준 Vol.1 No.-

P Element-Mediated Transformation with the rosy Gene in Drosophila melanogaster

김욱,Kim, Wook,Kidwell, Margaret G. The Korean Society for Integrative Biology 1995 동물학회지 Vol.38 No.3

D. melanogaster를 대상으로 두 종류의 P element construct, 즉 Pc[(ry+)B]와 p[(ry+)$\Delta$SX9]을 사용한 형질전환 실험을 통하여 자율적 및 비자율적인 P element construct간의 vector로써의 효율성을 분석했다. 자율적인 P element 내에 rosy 유전자를 포함하고 있는 Pc[(ry+)B] construct를 진정 M 계통형인 ry506 돌연변이 계통에 주입시켰다. 또한 비자율적인 P element 내에 rosy 유전자를 포함하고 있는 p[(ry+)$\Delta$SX9] construct와 전이효소의 공급원으로써 p-$\Delta$2-3hs$\pi$ helper plasmid를 역시 같은 계통의 ry506 돌연변이 계통에 주입시켰다. Dechorination 방법에 의해 총 1143 embryo를 대상으로 microinjection 한 결과, 모두 35 계통의 형질전환된 정상형의 눈을 가진 계통을 얻었다. P element construct를 주입시킨 전체 1143 embryo 중에서 약 20% 정도가 성체로 부화되었으며, 부화된 개체 가운데 약 40% 정도가 눈 색깔이 거의 정상형과 같은 G0 transformant 로 나타났다. 그러나 생식력을 가진 G0 transformant의 약 40% 만이 G1 transformant로 나타남으로써 모두 35 계통의 transformant를 얻었다. 따라서 G0 단계에서 나타난 형질전환 현상에는 반드시 rosy transformant의 염색체 삽입에 의해서 만이 아니라 세포질내에서도 construct내의 rosy 유전자의 발현이 가능한 것으로 분석되었다. 또한 형질전환율에 있어서는 Pc[(ry+)B]와p[(ry+)$\Delta$SX9] construct 간에 유의한 차가 없는 것으로 나타났다. 이상의 결과로 볼 때, 실험 목적에 따라 자율적인 P element 또는 helper DNA를 이용한 비자율적인 P element를 효과적인 vector 로 선택 이용함으로써 특정 유전자를 곤충집단내로 침투 및 고정시킬 수 있다고 판단된다. We have used two kinds of P element constructs, Pc[(ry+)B] and p[(ry+)$\Delta$SX9], for genetic transformation by microinjection of D. melanogaster. Pc[(ry+)B] construct carrying the rosy gene within an autonomous P element was injected into a true M strain caring the ry506. mutation. The source of transposase for microinjection and transformation was provided by a P element helper plasmid designated p-$\Delta$2-3hs$\pi$, which was co-injected with nonautonomous P[(ry+)$\Delta$SX9] construct into same ry506 M strains. A dechorination method was adopted and 35 independent transformed lines were obtained froin 1143 G0 Injected (35/1143). About 20% of the injected embryos eclosed as adults. Among G0 eclosed flies, approximately 40% exhibited eye color that was similar to wild-type (ry+), but about 60% of fertile G0 transformed lines appeared to have no G1 transformants. Therefore it is unlikely that G0 expression requires integration of the rosy transposon into chromosomes. Pc[(ry+)B] and P[(ry+)$\Delta$SX9] constructs were found to be nearly same in the frequency of element-mediated transformation. On the basis of these results, nonautonomous P elements constructs could he used as same effective vectors in P element-mediated transformation for introducing and fixing genes in insect populations.

정역 회전법에 의한 고순도 알루미늄의 응고 및 정련에 관한 연구

김욱,이종기,백홍구,허성강 ( Wook Kim,Joung Ki Lee,Hong Koo Baik,Seong Gang Heo ) 한국주조공학회 1992 한국주조공학회지 Vol.12 No.3

N/A The degree of purification and the macrostructure of high purity aluminium were studied through the alternate stirring method in order to improve the nonuniformity of solute concentration in the unidirectional stirring method. The 2³factorial design was done to examine the effects of experimental factors more qualitatively. In the relatively low stirring speed of 1500 rpm with alternate stirring mode, the uniform solute profile and refined grain structure were obtained due to strong washing effect and turbulent fluid flow. It was induced by the transition of the momentum boundary layer by alternation of the stirrer. It was concluded from this study that the alternate stirring mode was more effective to obtain the uniformity of solute even in the stirring speed of 1500 rpm. But the degree of purification decreased below the critical alternating period. When 2N(99.8wt.%) aluminium was used as the starting material the morphology of solid-liquid showed the cellular shape and the columnar grains were inclined to the direction of rotation. This inclined grain growth resulted from the difference of relative velocities of solid and liquid. The inclined angle was increased as the stirring speed increased and solidification proceeded. In the case of 4N aluminium, there was no inclined grain growth and it was confirmed from the macrostructure and SEM work that the morphology of solid-liquid interface was planar. From the factorial design, it was found that the alternate stirring mode showed poorer purification effect than that of unidirectional stirring mode at low speed(500 rpm). In addition, the factor that had the most significant effect on the degree of purification was the stirring speed.

생산성 향상을 위한 의식 전환

김욱,Kim, Uk 한국전자정보통신산업진흥회 1991 電子振興 Vol.11 No.2