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.

생산성 향상을 위한 의식 전환

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

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.

장막 침윤과 림프절 전이가 없는 위암에서 림프관 및 신경초 침윤의 의의

김욱,박조현,박승만,박우배,임근우,김승남,Kim Wook,Park Cho Hyun,Park Seung Man,Park Woo Bai,Lim Keun Woo,Kim Seung Nam 대한위암학회 2001 대한위암학회지 Vol.1 No.2

Purpose: The most important prognostic factors in gastric cancer are depth of invasion and lymph node metastasis. Therefore, the prognosis for serosa and lymph node negative gastric cancer is favorable. However, there is no general agreement on the prognostic factors in this subset of patients. This study was undertaken to evaluate the prognostic significances of venous invasion (VI), lymphatic invasion (LI), and perineural invasion (NI) in T1 and T2 gastric cancer without lymph node involvement. Materials and Methods: We retrospectively evaluated 206 patients with T1 and T2, lymph node negative gastric cancer who underwent a curative resection from 1989 to 1993 at Kangnam St. Mary's Hospital, Seoul, Korea. The Chi-square test was used to determine the statistical significance of differences, and the Kaplan-Meier method was used to calculate survival rates. Significant differences in the survival rates were assessed using the log-rank test, and the Cox regression method was used to evaluate independent prognostic significance. Results: The rate of VI, LI and NI correlated well with the depth of tumor invasion. The rates of VI (+) for T1 vs T2 was $0\%\;vs\;5.1\%$, of LI (+) was $5.6\%\;vs\;26.8\%$, and of NI (+) was $1.6\%\;vs\;26.8\%$ in NI (+). There were 13 recurrent cases, 10 cases out of the 13 were T2 gastric cancers, and the recurrence rate was higher in LI (+) and NI (+) cases than in LI (-) and NI (-) cases. The 5-year survival rates were $93.4\%$ in LI (-) cases, $77.4\%$ in LI (+) cases, $92.5\%$ in NI (-) cases, $74\%$ in NI(+) cases, $95.9\%$ in LI (-) NI (-) cases, and $73.9\%$ in LI (+) NI (+) cases. Multivariate analysis demonstrated that simultaneous LI and NI was the only significant factor influencing the prognosis. Conclusion: These results suggest that simultaneous lymphatic and perineural invasion may be an independent prognostic factor in patients with T1 and T2 gastric cancer without lymph node metastasis.

골프 동호인들의 운동열정과 운동몰입 및 운동지속의 관계

김욱한(Kim, Wook-Han),이봉(Yi, Bong) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.1

This study was proposed to provide fundamental information for understanding psychological characteristics of club golf coterie members via verification of structural relationship among passion, commitment and adherence in the group of amateur club golfers. To attain this purpose, total 337 subjects were selected with purposive sampling of non-probability sampling method for survey, and the final 315 data were analyzed with structural equation modeling. First of all, the relation between passion and commitment showed that harmonious passion has significant effect on behavioral commitment(β=.597, p〈.001) and cognitive commitment(β=.527, p〈.001) positively, and obsessive passion has significant effect on just cognitive commitment (β=.261. p〈.001) factor positively. Second, in the relation between exercise passion and exercise adherence, only harmonious passion showed positive effect on exercise adherence(β=.261, p=023). Finally, the relation between commitment and exercise adherence displayed that both of behavioral commitment(β=.322, p〈.001) and cognitive commitment(β=.327, p〈.001) positively affected exercise adherence.

직장의 인간학

김욱,Kim, Uk 기술표준원 2002 기술표준 Vol.3 No.-

원자력발전소(原子力發電所) 가동중(稼動中) 검사(檢査)의 시험분석(試驗分析)을 위한 자동화연구(自動化硏究) (I)

김욱,Kim, W. 한국비파괴검사학회 1985 한국비파괴검사학회지 Vol.5 No.1

The developing country, KOREA where does not possess the natural resources for traditional energy such as oil and gas, so. The nuclear energy is the most single reliable source available for closing the energy gap. For these reason, It is inavoidable to construct the nuclear power plant and to develop technology related nuclear energy. The rate of operation in large nuclear power facilities depends upon the performance of work system through design and construction, and also the applied technology. Especially, it is the most important element that safety and reliability in operation of nuclear power plant. In view of this aspects, Nuclear power plant is performed severe examinations during preservice and inservice inspection. This study provide an automation of analysis for volumetric examination which is required to nuclear power plant components. It is composed as follows: I. Introduction II. Inservice Inspection of Nuclear Power Plant ${\ast}$ General Requirement. ${\ast}$ Principle and Methods of Ultrasonic Test. ${\ast}$ Study of Flaw Evaluation and Design of Classifying Formula for Flaws. III. Design of Automation for Flaw Evaluation. IV. An Example V. Conclusion In this theory, It is classifying the flaws, the formula of classifying flaws and the design of automation that is the main important point. As motioned the above, Owing to such as automatic design, more time could be allocated to practical test than that of evaluation of defects, Protecting against subjective bias tester by himself and miscalculation by dint of various process of computation. For the more, adopting this method would be used to more retaining for many test data and comparative evaluating during successive inspection intervals. Inspite of limitation for testing method and required application to test components, it provide useful application to flow evaluation for volumetric examination. Owing to the characteristics of nuclear power plant that is highly skill intensive industry and has huze system, the more notice should be concentrated as follows. Establishing rational operation plan, developing various technology, and making the newly designed system for undeveloped sector.

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.

냉각체 회전법에 의한 고순도 알루미늄 및 규소의 응고 및 정련에 관한 연구

김욱,이종기,백홍구,윤우영 ( Wook Kim,Jong Ki Lee,Hong Koo Baik,Woo Young Yoon ) 한국주조공학회 1991 한국주조공학회지 Vol.11 No.4

N/A The Purification mechanism of high purity aluminum was studied through the variation of stirring speed and coolant flow rate in the stirring method. In the stirring method the degree of purification was changed as the following factors :the variation of diffusion boundary layer thickness the variation of growth rate and the solute concentration of the residual melt. The concentration of Fe and Si was decreased as the stirring speed and the radial distance increased. In a high stirring speed of 2000rpm with unidirectional stirring mode, the uniformity of solutes was obtained. On the other hand, the purification of Si was done by the combinations of stirring method, fractional melting and acid leaching. In the case of Si purification, the centrifugal force developed in the melt acted as the significant purification factor. It was possible to obtain the purified 3N grade Si crystal after the complete elimination of residual aluminum by fractional melting and acid leaching.