이동통신 환경에서 DS-CDMA 신호의 방향성 추정

양두영,문성익 제주대학교 공과대학 첨단기술연구소 2003 尖端技術硏究所論文集 Vol.14 No.2

The DOA(direction of arrival) of DS-CDMA signals for mobile communication environment was estimated using non-parametric algorithm and MUSIC(multiple signal classification) algorithm. The non-parametric algorithm with regularizing sparsity constraints achieved super-resolution and noise suppression. effectively. This algorithm offered the increased resolution and significantly reduced sidelobes compared with MUSIC algorithm. The numerical analysis showed that it can accurately find DOA and improve the detection probability of the multiple signals.

모드 정합법을 이용한 직교모드 변환기 해석 및 설계

문성익,양두영 濟州大學校 情報通信硏究所 2000 情報通信硏究所論文集 Vol.3 No.-

In this paper. the orthomode transducer of the antenna feed system is analyzed and designed. It consists of combining the common circular waveguide with the two sub-rectangular waveguide. The size of the circular and the rectangular waveguide are WC59. WR62 and the orthomode transducer considered the 13th high-order mode. From the boundary condition for the electromagnetic field. the scattering parameters are derived from the Hybrid electromagnetic mode theory. The computed results are compared with HFSS of 3D simulation tool for the microwave circuits. The results show a good characteristic that the S_(11) and S_(22) are below -15.5dB and S_(33) S_(44) are below -14dB in the range of 14.5~16.5GHz.

MUSIC 알고리즘을 이용한 적응 빔 성형에 관한 연구

문성익,이광식,양두영 제주대학교 공과대학 첨단기술연구소 2003 尖端技術硏究所論文集 Vol.14 No.1

In order to estimate DOA(Direction Of Arrival) of signal, the adaptive beam forming algorithm based on MUSIC(Multiple Signal Classification) is studied and analyzed. The eigenvalues for the signal component and the noise component are obtained from correlation matrix of the received signal by array antenna. The eigenvalues classified the signal components into the noise components decide the power spectrum of the received signal. From the results, DOA is estimated by the signal and noise spatial vector, and the steering beam pattern is found by weight vectors calculated from the spatial vector, effectively.

Ether 및 Halothane마취시 정맥혈에서의 Lactate, Pyruvate 및 Excess lactate치의 변화에 대한 연구

김익수,최세진,백문기,황병두 대한마취과학회 1977 Korean Journal of Anesthesiology Vol.10 No.3

Venous blood lactate, pyruvate and excess lactate have been measured by the enzymatic method and calculated in 24 patients over a period of 2 hours during operation under general anesthesia. When the anesthetic was diethyl, ether, lactate and dyruvate levels showed a gradual increase significantly from 30 minutes and 60 minutes after induction of anesthesia respectively. Excess lactate appeared 30 minuts after induction of anesthesia, being increased slightly thereafter. When halothane was used, lactate level rose significantly in 120 minutes but no significant change in pyruvate and excess lactate was observed. In comparison to the results obtained in arterial blood during ether anesthesia by others, the levels of lactate and pyruvate found in this study were higher than those observed in arterial blood, whereas there was no considerable difference in change with duration of anesthesia and excess lactate. From the above results we suggested that venous blood lactate, pyruvate and excess lactate were essentially the same as those of arterial blood for evaluating tissue hypoxia during general anesthesia.

공장 업무자동화를 위한 분산처리 시스템의 개발

박두순,공용해,오동익,정종석,오은숙 호서대학교 반도체제조장비국산화연구센터 2000 학술대회 자료집 Vol.2000 No.1

(주)한길은 콘크리트 2차 가공 업체로서, 주로 벤치플륨, 맨홀, 수로관, PC암거박스 등을 생산하고 있는 중소기업이다. 이 업체는 제품의 특수성과 생산 시설의 규모로 인하여 납품 계약 후에 미리 적정량을 생산하여 재고로 보유하면서 제품을 적기에 납품해야 한다. 그러나 현재 입고, 재고, 출고 관리 등의 업무전산화가 이루어져 있지 않을 뿐만 아니라 생산, 저장, 관리가 동일한 장소와 더불어 지역적으로 분리된 곳에서 이루어지고 있어 정보관리에 많은 어려움을 겪고 있다. 이에 본 연구에서는 근거리 네트워크와 전화접속 네트워크를 혼합한 하이브리드 형태의 분산 환경 시스템을 구축하여 경제적으로 가장 최적인 네트워크 솔루션을 제공하고, 이를 바탕으로 하는 입고, 재고, 출고 관리 시스템과 기본적인 회계 등의 전산 업무를 개발하여 업체의 생산성 및 경쟁력 향상을 도모하고자 한다.

감귤의 樹體生長 및 開花結實에 미치는 B-995(n-Dimethyl Amino Succinamic Acid)의 效果

文斗吉,白子勳,張田益 제주대학교 1975 논문집 Vol.7 No.-

B-995 solutions, in concentrations of from 500 to 3,000㎎/ℓ in Aug. and Sept., and from 500 to 5,000㎎/ℓ in Oct. and Nov., were sprayed on four-year old Hayashiunshiu(a cultivar. of Satsuma mandarin) trees on trifoliate orange stocks. Neither the shoot length nor the internode length of summer-and autumn-cycle shoot was affected by B-995 treatments in Aug. and Sept. The number of flowers born on a tree in the following spring was not significantly influenced by and of the above treatments. Even when nine-year old bearing trees were sprayed with B-995 solutions in conc. of 0-3,000㎎/ℓ from Aug. to Oct., no significant changes were observed in the volume increasement, coloring, and juice Brix and acid content of their fruits. It was showed that Satsuma mandarin trees were very insensitive to the sprays of B-995, and it was concluded that B-995 could not be utilized for the purpose of regulating the tree growth, flowering, and fruit development of Satsuma mandarin.

퇴행성 슬관절염 환자의 증상 중증도 측정을 위한 적외선 체열상의 유용성

이두익,김건식,김수영,최도영,이상훈,이재동,이윤호 EAST-WEST MEDICAL RESEARCH INSTITUTE KYUNG HEE UNI 2005 東西醫學硏究所 論文集 Vol.2005 No.-

Objectives: To investigate the applicability of thermography as severity measurement in the patients with osteoarthritis (OA) of the knee. Methods: Data were obtained from 80 patiens with OA of the knee. They were asked to answer two disease-specific questionnaire (Western Ontario and McMaster Universities (WOMAC) OA index, Lequesne's Functional Index (LEI)), one generic instrument (Korean Health Assessment Questionnaire (KHAQ)), Visual Analogue Scale (VAS) pain intensities in order to assess the severity of disease, quality of life, and degree of pain and taken thermography in standardized environment before and after treatment, respectively. Results: The thermal differences between ipsilateral side and contralateral side in lateral aspect, medial aspect, patella region and suprapatella of both knees were correlated with pain lesion sites. Age, duration of disease, duration of morning stiffness, sex, and crepitus of knee were not correlated with the thermal differences of each regions. And also LFI, WOMAC, WOMAC pain subscale, WOMAC stiffness subscale, WOMAC physical function, KHAQ, were not correlated with the thermal differences of each region. But, the changes of VAS pain intensities were highly correlated with the thermal differences of each regions, especially in patelaa and suprapatella of knees after teratment. Conclusions: Although several specific evaluation indices for osteoarthritis of knee were not correlated with the degree of thermal differences between both knees, the differences of pain intensity (VAS) were quit correlated with thermal differences after treatment. And infrared thermography might be a very useful devices fot the evaluation of OA of knee and its treatment. Further study on the thermography on OA of the knee in more size of patients with appropriate severity grade and the standardization of analysis of thermographic data were recommended.

工夫하며 運動하는 選手像 定立을 위한 調査硏究

尹益善,金振杓,金斗敬 龍仁大學校 1995 용인대학교 논문집 Vol.11 No.-

The purpose of physical education is to bring up the whole-man individual, physically, spiritually, intellectually, and socially balanced, who contributes to an individual life. In connection with the measure to allow the student to grow up as the one studying and exercising in their own way to prepare for the education of internationalization and opening, the following conclusion was drawn : (1) The matter of course that the athlete ought to receive the record of 70~80 points, though not studying, by imposing the privilege only on the athlete should be eliminated by revising the school record management regulation in each school boldly, and the athlete should be guided so that the athlete with any specialty can attend school, take for on examination justly, and acquire records soundly and squarely. (2) By distinguishing the specialty-athlete from the non-specialty athlete, either athlete should be instructed about both theory and practice matching the standard of mathematical ability for the college that they want. Accordingly, the athletic student should be instructed by establishing the college preparatory instruction plan systematically, mapping out the practical curricular instruction plan, and schooling should be accomplished so that the athletic students may improve their quality and ability. (3) As the specific-purpose school or the vocational high school secures the number of the curricular hours of cultural sciences to a maximum(216 credits), the basic and practical elements of learning matching the actual condition of the athletic students should be excluded, and teaching material be reorganized. And the curricular instruction plan should be hammered out, and its understanding should be promoted. The number of the lost hours of school should be resolved through the exhaustive supplementary lessens and the student-initiated lessons, and the climate that the student study on their own should be promoted. (4) Sports activities should be managed for the purpose of pursuing education for the whole man with the notion that the sport activity is an extension of education, and the state of physical exhaustion from hard training should be emotionally purified through reading, or music or art appreciation. And the promotion of the spirit of cooperation and harmony through special activities could impose on the athletic student their abilities to study on their own. (5) The quality of education stems from teachers. The image of the educator is desperately required that the teacher instructs students by studying teaching materials all the time and endeavoring through education, training, seminar, and the like endlessly. The trinity of school, society and household is strongly required that treat the excellent teacher and the climate that the new education improvement is guided by cultivating the student's ability to think high-dimensionally and the student's ability to participate in intellectual society, and by devising the curricular improvement scheme.

승객용 엘리베이터 와이어로프의 유효수명 및 교체시기 평가

손두익,박재석,오환섭 한국안전학회 2003 한국안전학회지 Vol.18 No.4

The wire rope, one of the component of the elevator, is extremely important for the safe operation of the elevator. That is why the wire rope is replaced at a specific interval regardless of the operating conditions or the degree of damage to prevent the breakage of the wire rope. This is the waste of resources, causing economic and environmental loss. This paper has surveyed and analyzed the status of replacing wire-rope by buildings that use elevators, in order tc compare the replacement cycles of the wire rope under each operating conditions.

Ku 밴드 안테나 급전시스팀 설계

문성익,이정란,양두영 濟州大學校 産業技術硏究所 1998 산업기술연구소논문집 Vol.9 No.2

In this paper. design of the antenna feed system for Ku-band is presented by TE_(mn)^(x) mode theory. The antenna feed system consists of diplexer combined with transmitting filter and receiving filter, OMT(Othogonal Mode Transducer) and polarizer. These filters are designed by the insertion loss method which is applied to the mode matching method. Matching elements in the inner waveguide set to reduce mismatching conditions on the discontinuity imposed by T-junction, so that a diplexer is optimized and has the best property. The optimum filter appeared characteristics that reflected power is about -2OdB in the receiving and the transmitting passband. The differential phase shift of the corrugated polarizer combined with OMT achieved 90°±1° within 14.0 - 14.5㎓ frequency-band. The maximum VSWR is only about 1.02 and axial ratio(AR) is about 1.01. The designed feed system has suitably separated between the polarized wave and the frequency bandwidth.