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許聖雨,申成植 東亞大學校 附設 情報通信硏究所 1995 情報通信硏究所論文誌 Vol.3 No.1
본 연구에서는 분리된 두 직교 다각형을 결합하여 분리되기 전의 직교 다각형을 복원하는 효율적인 알고리즘을 제안한다. 직교 다각형의 복원을 위해서는 일치되는 체인을 찾아야 되는데 이를 효율적으로 찾을 수 있는 알고리즘을 제시한다. 분리된 직교 다각형을 분리 형태에 따라 분류하였고, 분류에 따른 체인간의 성질을 규명하였으며, 그 성질들을 이용하여 알고리즘의 효율을 높일 수 있음을 보였다. 제안한 알고리즘은 크게 세 단계로 처리되는데 첫째 단계에서는 체인의 양 끝에 있는 꼭지점들의 상대 좌표를 이용하여 일치될 수 없는 체인을 제거하였고, 둘째 단계에서는 체인 간의 성질을 이용하여 또한 일치될 수 없는 것들을 제거하였으며, 마지막 단계에서는 남아 있는 체인들에 대해 수정된 문자열 검색 알고리즘을 이용하여 일치성 여부를 결정한다. 알고리즘의 수행 시간은 최악의 경우 O(n²)이나, 실험 결과에 의하면 평균 수행 시간이 O(n)이 됨을 볼 수 있었다.
김대식,이상종,윤신중,이일재 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.3
This research aims at examining Physical Characteristics of apparatus gymnast by degrees, Physical Traits are important information to choose better apparatus gymnast and to predict the ability of improvement, To do this, 8 national team members, 8 such-like substitutes, and 8 general team members, 24 apparatus gymnast in total were subjected, Analyzing average value with two variants performed two times. The research made a conclusion as following. 1. Weight makes difference in apparatus gymnast according to the level of competence, National team members were the lightest, and substitutes, and general team members in turn. 2. Skinfolds makes difference in apparatus gymnast's iliac crest, front thigh, medial calf, subscapular, eiceps, supraspinale and abdominal according to the level of competence. 3. Girths makes difference in apparatus gymnast's forearm(maximum), gluteal(hips), arm(relaxed), arm(flexed & tensed), thigh(1cm gluteal), thigh(mid troch-tib-lat), calf(maximum) and ankle(minimum) according to the level of competence. 4. Lengths doesn't maim difference in apparatus gymnast according to the level of competence. 5. Breadths doesn't make difference in apparatus gymnast according to the level of competence.
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.
독립과 상관된 레일리 페이딩 채널하에서 최대비 합성 다이버시티의 성능평가
이성신,정주수,변건식 東亞大學校附設 情報技術硏究所 2004 情報技術硏究所論文誌 Vol.12 No.1
In this paper describes a mathematical model for fading and quantitatively describes the effects of fading on the BER of digital communications systems. And the describes the diversity combinding techniques used to combat the destructive effects of fading and quantitatively describes the SNR gain achieved due to diversity. And this paper simulates maximal ratio combining(MRC) in dependent and correlated Rayleigh fading channels. While channel correlation is a key factor in the performance of linear combining, significant performance improvement can still be achieved with correlated fading channels.
교류전해에칭용 에틸렌글리콜의 알루미늄박판의 부식억제 효과
박성민, 양정진, 김홍일, 김한주, 김성한, 신진식, 박수길 충북대학교 건설기술연구소 2008 충북대학교 건설기술연구소 논문집 Vol.27 No.1
In this study, additions of aluminium foil eching characteristics were compared with sulfuric acid for capacitor. sulfuric acid and ethylene glycol is used as addition, characteristics of funtional group from addition were guessed by comparing of aluminium foil eching characteristics. When sulfuric acid was added in HCI etching solution, corrosion of aluminum metal was inhibited by the chemical adsorption of sulfate ion, when ethylen glycol was added in HCI etching solution, corrosion inhibited by the chemical adsorption of OH^ion.
S-Function Builder를 이용한 UWB 시스템의 성능해석
이성신,김기표,최정식,변건식 東亞大學校附設情報技術硏究所 2005 情報技術硏究所論文誌 Vol.12 No.2
The application of UWB not only complies with the requirements of remote sensors system(ECG), it also contributes to the effectiveness of the implementations through its unique qualities such as ultra low transmission power - an important factor when dealing with biomedical equipment. In this paper, the aim is to replace the wired ECG sensor with a wireless link and design wireless UWB communication system. The various pulse shapes are presented that satisfies the FCC spectral mask and FCC part 15 rule. It is shown that UWB can be a high rate transmission over short ranges using rake receiver, with the capability for reliably transmitting 100Mbps over distance at about 10 meters.
최정식,이성신,김기표,변건식 東亞大學校附設 情報技術硏究所 2005 情報技術硏究所論文誌 Vol.13 No.1
OFDM technique which the available bandwidth is split into several narrowband subchannels at different frequencies is particularly suited for transmission over frequency selective channels. But if the states of some subchannel are bad, the performance of system become to decrease. The principle of bitloading is to adjust the date rate on the individual subchannels based on the current SNR. A subchannel with high SNR is then assigned more bits than a subchannels with lower SNR. As a results, we confirmed the superior performance if we used bitloading algorithm in OFDM system.
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.