Point-Location모델을 이용한 산지시장가격의 동태적 구조 분석

최규섭,권용덕 한국농업정책학회, 한국축산경영학회 2000 농업경영정책연구 Vol.27 No.1

This study uses a cointegration method based on point-location model to analyze spatial price relationship among kyungpook cattle markets in korea. According to the results, there is a cointegration relationship between prices of male and female cattle markets. This suggest that these markets are linked with the single market spatially. The prices of Koryoung female cattle market in south and Youngju female cattle market in north have influence on the price change of other female cattle market and play an important role in price movement of other female cattles. In case of impulse response results, the price of female cattle market appears to adjust to equilibrium level faster than that of male cattle market.

수상관의 밝기 및 해상도를 고려한 기준 백색 설정

최덕규,한찬호,정영헌 경운대학교 산업기술연구소 2001 産業技術硏究論文誌 Vol.3 No.2(C)

Reference white in color television receiver can be achieved by adjusting the RGB gun current ratio and it is necessary to provide additional gain ratio adjustment for the RGB video signal. Generally, the gun current density profile has a Gaussian distribution and the gain-bandwith product of RGB channel amplifier is constant. Therefore brightness and spatial resolution are changed with variations in reference white of receiver. In this paper, the effect of RGB gun current and channel gain ratios on brightness and resolution of CPT is analyzed. Brightness is increased with the color temperature of reference white because of Holmholtz-Kohlrausch effect. The change in light output is more abrupt and spatial resolution is improved with unity current ratio. For more bright and improved resolution we also present the range of color temperature of reference white for P22 phosphors.

SMD 자동화 공정의 부품 혼입 방지 시스템

최덕규,박차훈,김태선 경운대학교 산업기술연구소 2002 産業技術硏究論文誌 Vol.5 No.1(B)

SMD (surface Mount Device : Print된 기판에 부품을 장착)공정은 완전 자동화 시스템이며, 이 작업을 진행하기 위하여 백 수 십여 가지의 부품을 정해진 부품 카트리지에 삽입한 후 자동화 설비는 그에 맞는 부품을 장착하게 된다. 그러나 부품을 카트리지에 삽입하는 작업을 작업자가 하게 되는데 이는 사람이 하는 일이라 Human Error가 발생할 가능성이 높다. 본 논문에서는 Chip Mounter에 센서를 부착하여 카트리지의 탈착 여부를 실시간으로 감시하는 모니터링 시스템과 부품 카트리지에 표시된 정보를 Bar-code Reader로 판독하게 함으로서 SMD Chip 장착 자동화 공정의 부품 혼입 방지 시스템을 개발하였다. 개발한 장비를 현장에 투입, 실 생산활동에 활용하게 하여 해당기업의 생산성 향상에 크게 기여하고 있다.

가우시안 빔 프로파일의 CPT를 위한 비선형 주사속도변조

최덕규,한찬호,정영헌 경운대학교 산업기술연구소 2001 産業技術硏究論文誌 Vol.3 No.2(B)

A scan velocity modulation(SVM) technique has been widely used for compensating the deterioration of picture quality due to the beam profile effect of the color picture tube(CPT). In conventional SVM system the so-called linear SVM method has been employed, whose modulation velocity is linearly proportional to the variation in the video signal amplitude. However, the effect of picture quality improvement is irregular with video signal amplitude in the linear SVM. In this paper we report a theoretical analysis of the SVM effect on the spatial brightness distribution of CPT according to the variations in luminance signal amplitude and differentiation circuit characteristic. We also propose a nonlinear SVM method based on the results of the theoretical analysis for optimum picture quality improvements. In computer simulation we confirmed uniform improvements in picture quality by the SVM of nonlinear amplitude transfer characteristic.

LCD의 회색 준위 상관 색온도 보정

최덕규,박차훈,김태선 경운대학교 산업기술연구소 2002 産業技術硏究論文誌 Vol.5 No.1(B)

At the present time, the LCD (liquid crystal display) not only emitsless radiation and consumes less power, it also takes up less space allowing for a more comfortable work environment. This paper looks into characteristics of LCD's CCT. We propose the LUT (look-up table) which adjust the three primary colors'digital input value, for maintaining the fixed value of correlated color temperature. LCD's CCT is maintaining about 6500 K, which is the standard CCT of display systems. Moreover it is the same as the former LCD's luminance that LCD's with using the LUT. In addition, we confirm that the color reproducibility of LCD using the proposed LUT become much accurate than a conventional LCD.

허혈성 심질환에서 염증지표에 관한 연구

번정득,권영주,박상호,한대희,이상철,강진환,김명구,심규혁,최병조,온영근,현민수,김성구 순천향의학연구소 2001 Journal of Soonchunhyang Medical Science Vol.7 No.2

Background : Atherosclerosis is the chief underlying cause of ischemic heart disease and there is increasing evidence that inflammation is an important determinant of the development of atherosclerosis. We assessed the levels of inflammatory markers in patients with ischemic heart disease and normal group who has normal coronary angiograms. Materials and Methods : Coronary angiography was performed in 142 patients. 107 patients of ischemic heart disease(stable angina pectoris 58, unstable angina pectoris 30, Acute myocardial infarction 19) and 38 normal control subjects. We assessed the level of inflammatory markers, such as CRP, ESR, fibrinogen and leukocyte. Results : CRP, ESR and fibrinogen values of the patients with stable angina pectoris and unstable angina pectoris were higher than that of normal control group, but there were no statistical significance. Leukocyte value of the patients with unstable angina pectoris(9003.3±701.5/mm^(3)) was significantly higher than that of the patients with stable angina pectoris(6685.5±245.8/mm^(3)) and normal control subjects(6394.3±235.1/mm^(3)). CRP, ESR and fibrinogen values of the patients with acute myocardial infarction were also higher than that of normal control subjects. CRP was 3.88±2.05 mg/dL in acute mocardial infarction group, and 0.29±0.15 mg/dL in normal control subject group(p<0.05). Fibrinogen was 541.6±45.1 mg/dL in acute myocardial infarction group, 321.4±25.6 mg/dL in normal control subject group(p<0.05). Leukocyte was 10942.1±737.6/mm^(3) in acute myocardial infarction group, 6394.3±235.1/mm^(3) in normal control subject group(p<0.05). Conclusions : This study demonstrate that CRP, fibrinogen and leukocyte values of acute myocardial infarction group were significantly higher than that of control group and stable, unstable argina pectoris group. Leucokyte values were significantly elevated in unstable angina group, but CRP values were not in unstable angina group.

선착효과 및 반사음을 이용한 스테레오 음상확대

한찬호,최덕규 경운대학교 산업기술연구소 2000 産業技術硏究論文誌 Vol.3 No.1(B)

In the AV system, to produce a realistic sound effect is very difficult because the distance between stereo speakers is very narrow. Many signal processing method of widening the sound image for spatial impression have been studied. Most of the typical methods of widening the sound image are related to the phase shifting. but this method was not effective in the concrete wall structure with high reflectivity. In this paper, we proposed an effective method of extending stereo sound image using Precedence Effect and reflected sound. In experiments we confirm the usefulness of the method for extending stereo sound image of a conventional AV system in wider listening area of a room.

생체신호 처리용 지능형 ASIC 칩 개발

박차훈,최덕규,김태선 경운대학교 산업기술연구소 2002 産業技術硏究論文誌 Vol.5 No.1(A)

The proposed enhanced telemetry IC is verified with Altera FPGA chip (EPF10K20RC240-4) and layout with 0.6㎛ CMOS n-well process technology. For the VLSI design, a high level language was used, decreasing layout time by a factor of four. They resulting design, performed with a combination of Synopsys behavioral and structural code. The digital simulator used was VHDL logic simulator running under MaxplusⅡ.

스피커 특성 및 오차경로의 온라인 인식을 이용한 새로운 적응 능동소음제어

한찬호,최덕규,정영헌 경운대학교 산업기술연구소 2001 産業技術硏究論文誌 Vol.3 No.2(B)

In active noise control system, the error path transfer function is much more likely to change rapidly due to in temperature or flow rate. The loudspeaker response also changes due to aging and the other factors. Therefore, an improved solution to obtaining both the loudspeaker and the error path transfer functions on an on-line basis is required. In this paper, a new filtered-X least mean square(LMS) algorithm considering the loudspeaker and the error path characteristics is proposed for active noise control system. The transfer functions of the loudspeaker and the error path are obtained by an adaptively estimated error signal and the error path output signal on an on-line basis. In the computer simulation using the sinusoidal and the practical duct noise, the proposed algorithm reduces noise level about 29.1dB and 10.4dB, respectively. We observed an improvement of about 2.5dB in noise level compared with that obtained using the Eriksson's filtered-X LMS algorithm.

국부 컬러 정보를 이용한 내용기반 영상 검색

김태선,최덕규,박차훈 경운대학교 산업기술연구소 2002 産業技術硏究論文誌 Vol.5 No.1(A)

In general, color histogram method are widely used for the content based image retrieval. However, because of the absence of spatial information, it is difficult to discriminate images of the similar histogram. Thus this paper, we propose content based image retrieval method using local color information. Proposed method stores edge neighbor color histograms for edge pixel as index information, which combines spatial information with color information in images efficiently. The experimental results show that the proposed method can give better recall and precision performance than other methods using color histograms or color coherence vector(CCV).