Back Propagation 알고리즘을 이용한 산업용 로봇의 견실제어

윤주식,이희섭,윤대식,한성현 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-

Neural networks are works are used in the framework of sensor based tracking control of robot manipulators. They learn by practice movements the relationship between PSD(an analog Position Sensitive Detector) sensor readings for target positions and the joint commands to reach them. Using this configuration, the system can track or follow a moving or stationary object in real time. Furthermore, an efficient neural network architecture has been developed for real time learning. This network uses multiple sets of simple back propagation networks one of which is selected according to which division(corresponding to a cluster of the self-organizing feature map) in data space the current input data belongs to. This lends itself to a very training and processing implementation required for real time control.

수중환경 변수의 변화에 따른 능동소나 표적검출 성능분석에 관한 연구

윤대희,이충용,성하종,박성범,정형성 연세대학교 산업기술연구소 1997 논문집 Vol.29 No.2

In this paper, the performance of active sonar system is analyzed under various underwater acoustic environments using the multipath eigenray model in shallow water. In addition, an approximated shallow-water propagation model is proposed for the active sonar based on MacPherson and Daintith's model and corresponding equations comprising active sonar parameters are derived. To analyze the sonar performance according to the changes of various sonar parameters, a large number of measurements and results in ocean acoustics and digital signal processing are combined. The proposed model is compared with the multi-path eigenray model in terms of the echo level passed through the beamformer, the input SNR of the detector and the detection probability.

우리나라 經營者의 企業家精神의 決定要因에 관한 硏究

尹大赫 釜山外國語大學校 1998 外大論叢 Vol.18 No.3

Followings are the results of study about examining and analyzing the determinant factor of entrepreneurship. First, the difference of sttitudes in enterprise patterns concerning environment, organizing structure and industrial strategy is revealed meaningfully between simple firms and planning firms, and planning firms and organic firms, and simple firms and organic firms respectively. Secondly, the results of analyzing the six factors from analyzing mutual dependence between environment, organizing structure and industrial strategy, and the determinant factor of entrepreneurship are as follows: the organizing structure affects mostly the simple firms. The product innovation and initiative action are meaningful, but the advbentrrous spirit and value are not in case of planning firms in 5% meaningful level. And in case of organic firms only the product innovation is meaningful. Finally, the determinant factors of entrepreneurship are influenced mostly by character and knowledge of the leading managers in the simple firms, by distinctiveness of industrial strategy and environmental factor in the planning firms, and by organizing structurein the organic firms because theyare the firms to use expert skill-managers, projects and internal communication according to adhocracy.

학생 의견을 수렴한 건축설계 교육시스템

윤대한,신석균 광주대학교 1999 産業技術硏究 Vol.12 No.-

UIA를 통한 건축학 교육시스템 및 그 교육내용을 변화시킬 것을 강요받고 있는 현 시점에서, 본 글은 광주대 건축학과의 교육개편에 기초자료로 사용하기 위해 학생들에 대한 설문조사를 실시하엿다. 그 주요 결과는 건축학 교육시스템은 학부 5년제, 설계과목의 비중은 한 학기 18학점 기준 6학점 이상, 그리고 약 10명 정도의 분반규모로 주 2회 수업에 하루 약 4.5시간의 수업형태가 적합한 것으로 조사되었다. Nowadays, we are under the push from UIA to change the educational system of architectural design and its contents. We made a research about the demanding wishes of students and obtained the results as followings: the educational system should be five-year system in department of Architecture, the proportion of architectural-design subject in total grades should be more than about 34% in a term, and the architectural design class for 4.5 hours with about 10 students should be given to them twice a week.

근대건축에서 건축공간의 특성

윤대한 광주대학교 1998 産業技術硏究 Vol.11 No.-

서양건축사에서 중요한 위치를 점하고 있는 근대건축은 건축사상, 재료, 구조시스템을 일치시켰다. 사상적으로 서구의 합리주의에 바탕을 둔 공간개념과 기능주의를 그 두 축으로 하여 이를 결합하였으며, 철근콘크리트, 철, 유리와 같은 새로운 재료에 적합한 도미노 시스템, 시트로앙 시스템, 시카고 골조시스템을 개발하여 특징있는 근대건축의 공간을 만들어 내었다. 그러나 이 공간의 특성인 균질성 및 단순성으로 인하여 뒤에 많은 비판을 받게 되었다. Modern Architecture, which had significant position in the architectural history, united its thought, materials, and structural system. The concept of space and the functionalism which were based on the wehtern rationalism, was united by Modern Architecture. It made three major structural systems to make modern space, that is domino, citrohan, and chicago frame system. But its characteristic was spatial uniformity and was the target to criticize Modern Architecture by others.

영도 토양환경의 중금속오염에 대한 기초연구

홍영대,김윤희 고신대학교 영도발전연구소 2000 영도연구 Vol.2 No.-

Youngdo Island is suitable to be developed as a tourist town due to its beautiful natural surroundings. In connection with the above purpose, various harmful heavy metals were analyzed to investigate the level of pollution of Youngdo soil. The elements tested were Cd, As, Sn, Cr, Cu, Pb, Co, Ni, Mn and Zn. The results from Youngdo were compared with those of the Busan and the whole country in the investigation items which were decided by the Korean Ministry of Environment. The average contents of heavy metals in Youngdo soil were comparatively lower than those of Busan, and close to those of the whole country including uncontaminated natural soil. It was found that Youngdo-Gu remains clean soil environment except a few investigated sites at the industrial areas even though this district belongs to the Metropolitan Busan. This fact implies that Youngdo is to get well ready for a tourist town.

토양 내 소수성 유기물에 대한 천연계면활성제의 작용

윤상혁,조대철 순천향대학교 부설 산업기술연구소 2001 순천향 산업기술연구소논문집 Vol.7 No.2

We investigated a contiouous, chemical soil flushing method using β-cyclodextrin solution in a glass bed column, packed with well-prepared sand. The effluent solution was alalyzed via fluorescence spectrometric method, We found that cumulative HOC(hydrophobic organic compound) concentrations in the effluent, increased with flow rates of the surfactant solution as well as time (or number of washes). Also, phenanthrene was more effectively removed out of the bed than naphthalene probably due to its higher hydropholbicity. The HOC removal curves were found to be S-shaped as was usually found in elsewhere.

선진시대 법가의 이공수관과 유가의 존현임사의 비교

윤대식 충남대학교 아시아지역연구소 2006 아시아지역연구 Vol.8 No.-

This study is to reasoning the fact that legalism by Shang Yang and kingly government by Mencius were the heuristic for making prince and official-scholars perform their political obligation in the process of state-building. If the ruling by Pa symbolized as a legislative system obtained prevailing values in their own times, the ruling by Wang symbolized as a moral cultivation system also would be an intention which obtain prevailing values about typology of moral cultivation. So it is, which was the good choice? Was the meritocracy by Fachian good to adapt real world, or was the virtuous men by Confucian good to? This study is to compare the Confucian and Fachian alternatives in the context of political recruitment.

협력적 노사관계를 통한 근로생활의 질(QWL)향상 방안

윤대혁 대한경영학회 2003 大韓經營學會誌 Vol.16 No.6

This paper attempts to search cooperative system of labor-management relations in corporation level and Quality of Working Life(QWL) as an objective of labor-management cooperation. Therefore the main subject of this paper is to analyze the relationship between QWL and cooperative employer-employee management. Cooperative employer-employee management means not only joint consultation committee (works council) but cooperative aspects of all labor-management relations presupposed antagonistic labor-management relation. QWL is the concept which is created for eliminating alienation and coping with enlarged right consciousness of labor. QWL is the process improving job design and general labor environment through participation in management decision making. Then, labors perceive identification with Corporation, and are worth work living. And productivity may be improved as natural by product. To summarize the result of this study is follows. (1) QWL is useful activity which eliminate alienation and cope with enlarged right consciousness of labor. (2) Because QWL levels related to job, age, tenure are different, they are taken care in improving QWL. For instance, the young and skill job labors should be taken special care. (3) For the purpose of improving QWL through labor-management cooperation, firstly, it is needed to make efforts for eliminating negative force against labor- management cooperation. In this case, the support of top management and union leaders is needed. Secondly, it is needed to make efforts for providing opportunity for participation in decision making. This participation is a direct means of improving QWL. By the way, rather than permit participation in decision making given priority to productivity issues, management should permit participation in QWL issues equally in order to improve QWL effectively. (4) It requires long time to improve QWL through labor-management cooperation. Hasty expectation of result should be refrained.

백서 허혈성 국소 뇌경색에서의 소뇌 실정핵 자극 효과

박윤관,김대환,정흥섭,이기찬,주정화,이훈갑 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.3

Elecrical stimulation of the cerebellar fastigial nucleus(FN) increases cerebral blood flow(CBF) and reduces brain damage after focal cerebral ischemia. The authors studied whether the neuroprotection elicited from electrical stimulation of the cerebellar FN is attibutable to the elevation in regional CBF(rCBF) or reduction in release of excitatory amino acid. Sprague-Dawley rats were anesthetized with a mixture of halothane(3% for the induction and 1% for maintenance) and oxygen, and artificially ventilated through a tracheal cannula. Arterial pressure, blood gases and body temperature were monitored. The middle cerebral artery(MCA) was occluded distal to the lenticulostriate branches. The FN was then stimulated for 1 hour(100uA : 50Hz : 1sec on/1sec off). The changes in rCBF were measured by hydrogen clearance method for 2 hours, over the regions corresponding to the ischemic core and penumbra. Postischemic release of glutamate and aspartate were measured by microdialysis for 2 hours at the same site of measurement of rCBF. Infarct volume was determined 8 hours later in 2, 3, 5-triphenyl tetrazolium chloride(TTC)-stained sections. FN stimulation(n=12) increased mean arterial pressure by 28±16mmHg. In nonstimulated control rats(n=12), mean AP was not changed significantly during the experimental procedures. Compared with nonstimulated animal, stimulation of FN for 1 hour following MCA occlusion significantly increased rCBF in ischemic core and penumbra by 53.6% and 67.6% respectively. And the volume of infarction decreased by 42% at 8 hours after MCA occlusion. The concentration of glutamate and aspartate in ischemic core after MCA occlusion increased both in the control group(to 12.2±3.3 folds and 10.4±4.1 folds, respectively) and in the stimulation group(10.5±2.8 and 11.2±4.1 folds, respectively). The concentration of glutamate and aspartate in penumbra did change significantly neither in the control group(to 2.5±1.3 folds and 1.8±0.6 folds, respectively) nor in the stimulation group(1.9±0.5 folds and 2.1±0.4 folds, respectively). There was no significant difference between the two groups. These data indicate that neuroprotection elicited from electrical stimulation of the erebellar FN is attributable to the elevation in rCBF but no to the reduction in release of excitatory amino acid.