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박미선,장은영,변건식 동아대학교 정보기술연구소 2003 情報技術硏究所論文誌 Vol.11 No.1
MUD(Mu1tiUser Detector) is the best way of a solution to neai-far problem in CDMA system. Synchronous MUD is classified into linear and nonlinear. Linear MUD includes decorrelator, MMSE, LMS, RLS. Nonlinear MUD has SIC, PIC, DFD, this paper compared and evaluated performance of MUD'S features and confirmed that Blind MUD is used without training sequence.
박병우,정봉식,변건식 東亞大學校附設 淸報技術硏究所 2006 情報技術硏究所論文誌 Vol.13 No.2
This paper describes the hardware implementation of the EVD (Eigenvalue Decomposition) method for MUSIC algorithm. MUSIC algorithm is one of the super resolution algorithm which can estimated DOA. Applying isomorphic transformation, this system can be formulated in terms of real-valued computation. And using the householder matrix, we could reduce the burden of computation to evaluate the eigenvalue decomposition. Results show that eigenvalues have error rates within 0.7% in Matlab and VHDL simulation. The unique features of this system are the fast and compact computation of EVD.
박남천,송재홍,채건식,오재근,김영국,손인호 慶南大學校 附設 基礎科學硏究所 1995 硏究論文集 Vol.7 No.-
We studied the native defects of dilute magnetic semiconductors Zn₁-xFexSe epilayer by using SAW device. The energy gap of Zn₁-xFexSe for each epilayer(x=0.0213, 0.0915) was 2.57eV, 2.74eV at room temperature (294K). The trap level for x=0.0213, 0.0915 were calculated by measuring Transverse Acoustoelectric Voltage(TAV). Also we can calculated cross section.
유건우,이선희,임수정,박형진,김태신,송은식,송근호 忠南大學校 獸醫科大學 附設 動物醫科學硏究所 2009 動物醫科學硏究誌 Vol.16 No.1
A 6 years old Schunauzer dog (7.2kg, intact female) with history of hematuria for two days was referred to the Veterinary Medical Teaching Hospital of Chungnam National University. Complete blood cell count showed no significant abnormalities and serum chemistry profile showed increased phosphate profile. On urinanalysis, there was evidence of bacterial infection. On ultrasonographic evaluation, irregular renal contour and increased echogenecity, pelvic and uretral dilation, and thickening of urinary bladder wall were observed. Based on these finding, the dog was diagnosed as pyelonephritis. The dog was treated with antibiotics based on antimicrobial susceptibility test results, then successfully resolved after 8 weeks of treatment.
박남천,채건식,김영국,설정식,손인호 慶南大學校 附設 基礎科學硏究所 1997 硏究論文集 Vol.10 No.-
We have measured the energy gap in ZnSe as a function of temperature by Laser-Generaeted Photocharge Voltage Spectroscopy(PVS). Trap levels were calculated quasi equibrium, peak shape, initial rise methods. And We have measured the Photocharge Voltage as a function of temperature with varing heating rate. The trapping cross-section of ZnSe was calculated by the methods of Grossweiner.
한건연,박문호,이정식 경북대학교 산업기술연구소 1991 産業技術硏究誌 Vol.19 No.-
Optimum water quality management in the midstream of the Nakdong river was studied. Deterministic water quality model RQ1 and stochastic water quality model RQ2 have been developed. RQ1 contains two codes, RQ1-1 for hydraulic analysis and RQ1-2 for water quality analysis. RQ2 consists of Monte-Carlo simulation for the DO analysis in river. A water quality simulation using RQ1 and RQ2 in the midstream of the Nakdong river has been made. The computed concentration of DO and BOD at several points have good agreements with the observed data. BOD-DO profiles in this basin and the probability distribution for DO concentration at some points have been predicted in 1996 and 2001. This study provides the optimum water quality management planning in the future using the deterministic and stochastic water quality model.
선형 배열 안테나를 이용한 DS-CDMA 시스템의 성능 분석
김성곤,박미선,이성신,변건식 동아대학교 정보기술연구소 2003 情報技術硏究所論文誌 Vol.10 No.2
As a channel of a DS-CDMA system is shared among several users, the receivers face the problem of MAI. Also the bandlimited channel leads to ISI. Both components are undesired, but unlike the additive noise process, which is usually completely unpredictable, their space-time structure helps to estimate and remove them. This paper investigates a DS-CDMA system with a fading multipath channel. The investigations have been separated into a channel estimation part and a reception part. In the estimation part of separated two parts, the multipath parameters such as DOA and TOA are evaluated in this paper. In the part of receiver, we used these parameters and tested the performance of this receiver about space-time beamformers(Decorrelating, Match-Filter, Wiener-Hopf, Subspace-Based). To assess many different estimation techniques and beamformers, the simulation compared with theoretical values is performed.
오정근,박미선,이성신,이민혁,변건식 동아대학교 정보기술연구소 2002 情報技術硏究所論文誌 Vol.10 No.1
In the design of mobile wireless communication system, Base station location is one of the most important parameters. Designing base station location, the cost of equipment makes low by combining various, complex parameters. We can solve this problem by combining optimization algorithm, such as Simulated Annealing, Tabu Search, Genetic Algorithm, Random Walk Algorithm that have been used extensively for global optimization. This paper shows the 4 kinds of algorithm to be applied to the base station location optimization of mobile communication system and then compares, analyzes the results and shows optimization process of algorithm.
GPS 동기신호 수신기 개발 : 중간 주파수단과 데이타 추출
홍성일,이수영,박재운,변건식 동아대학교 공과대학 부설 한국자원개발연구소 1993 硏究報告 Vol.17 No.2
This paper concerns IF-stage and data recovery as a basic study for home products of GPS receiver. Using a transmission simulator, the same data can be received as transmission simulator transmits. Consequently, it is considered that IF-stage and the part of data recovery operate fairly good and attaching microprocessor control and time interval counter to this system will operate better. It can be expected that providing the system with RF-stage and antenna will be complete GPS receiver.
大邱地域 中小企業의 效率的인 技術開發 方案에 관한 硏究
全瑨文,張晩植,尹在坤,金圭昌,李栽燁,朴筍植,黃建夏 효성여자대학교 산업경영연구소 1988 경영경제 Vol.5 No.-
For modern business firms, the most important factor in determining comprtitiveness of a firm is technology, rather than capital. Technogical innovation is a driving force to develop an economy and is essential in growth and/or survival of a business firm. Following studies concerned with this subject, small business firms seem to be more efficient in technological innovation and developing new technology in several respects. Espercially in the new technology based industries, the small business firms have several advantages in technological innovation. In this study, we tried to show how to plan a technology development strategy in relation to management strategy when small business of theoretical and empirical study, we aimed to show the way to efficient management and procedure of technological innovation. For the research methodology, we firstly reviewed and analyzed current and previous studies about technological innovation strategy, efficient management, and selection of R&D projects. Secondly, the results of this theoretical study was examined empirically. The empirical study contains 153 questionaires and 30 interviews for business firms of this area. In addition, for the evaluation criteria for the selection of R&D projects, we sent questionaires to 60 professors who teaches R&D OR in university or college level. The result of these questionaires was analyzed and compared with that of the business firms of this area. The result of this empirical study shows that top management of small business firms should notice the importance of technological innovation and try to stimulate R&D activity. For the evaluation criteria for R&D projection, the criteria which could reduce the possibility of future uncertainty, maximize profit, and he suited for the situation of the business firm, should be established.