서로 다른 CNC 환경을 갖는 공작기계의 인터넷 기반 점검

김동훈,김선호,김경돈,김찬봉,고광식 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-

This paper proposes Internet-based checking scheme for machine-tools with a variant CNC. Checking points defined in this research are classified into two categories such as structured point and operational point. The formal includes the vibration of bearing, temperature of spindle unit and another periodical management. And the latter includes oil checking, clamp locking/unlocking and machining on/off status. Through this research, for the global management of variant CNC machines interspersed with CAC and OAC in manufacturing system, the suitable environment for Internet-based checking of variant CNC machines was designed and the checking methods for CAC and OAC machines were compared with each other.

독성물질의 세포사 기전 및 세포사 유발물질의 검색법 개발에 관한 연구(Ⅱ) : 망간 신경독성을 이용한 파킨슨증 모델의 세포사 Studies on the Mechanism of Parkinsonism induced by Manganese

김종민,박창원,오정자,이보경,서경원,서수경,김규봉,김종원,김광진,김영옥,전범석,박찬웅,이선희 식품의약품안전청 2001 식품의약품안전청 연보 Vol.5 No.-

1960년대 이후 파킨슨병의 유발물질 중 한 후보로서 망간이 주목받으면서 많은 역학적, 병러학적 연구가 수행죄브다. 그러나 망간이 파킨슨병을 직접 일으키는지, 혹은 파킨슨병과 관련된 부위의 신경세포를 파괴시쿡 파킨슨증만을 초래하는 것인지가 아직 정립되지 않은 실정이다 본 연구에서는 실험동물모델에서 행등학적 변화 측정 및 병리학적, 샐화학적 연구를 통하여 망간의 과다노출글 따른 파킨슨병 유발 여부를 확인하고자 하였다. Sprague-Datylet· 렛드에 망간을 1, 2, 5, 10 mgAg/day의 응량으로 30일 등안 복강 투여하였을 때 모든 망간투여군에서 운동성 감소가 관찰되었다. 뇌조직의 망간 함량을 ion chromatograph?로 측정한 결과 중뇌 흑질과 기저핵 선조체에서 망간 함량의 뚜렷한 증가 소견이 관찰되었으며, 니슬염색체서 선조체의 신경세포수의 유의성 있는 감소가 관찰되었다. 그러나, 흑질의 TH효소 면역염색, GFAP 면역염색, 흑질과 선조체의 T릿효소 western blot 결과는 대조군과 차이가 없었다. 이상의 결과에서, 망간-파킨슨증 모델에서 파킨슨증어 유발되는 기전은 흑질 도파민성 신경 세포의 신호를 받는 선조체 씬경세포의 사멸에 의한 것으로 생각된다. 결론적으로, 망간 독성에 의한 파킨스증 모델에서는 파킨슨 병과는 달리 흑질 도파민성 신경세포의 세포사는 관여하지 않는 것으로 관찰되었다. Manganese(Mn) intoxication causes a parkinsonian syndrome. It may be difficult to distinguish Mn-induced parkinsonism from idiopathic Parkinson disease(IPD). Neuropathological descriptions on the brains with Mn intoxication showed the perferential damage in the globus pallidus and substantia nigra pars reticularis. Pathological reports on the substantia nigra pars compacta(SNpc), a mafor focus of pathologic changes in IPD, are discordant and controversial. The SNpc involvement is of critical importance for the elucidation of pathogenesis of IPD. Therefore, the neurodegeneration in SNpc was investigated in the experimental model of Mn neurotoxicity. Sprague-Dawley rats were administered with manganese chloride(1, 2, 5, 10 mg/kg/day, i.p.) for 30 days. Treated animals showed low levels of distance-traveled from locomotor activity tests. Ion chromatography revealed that Mn accumulation was significant in SN and basal ganglia in Mn-treated animals. Nissl staining showed neuronal loss of the striatum in all treated animals. The degree of neurodegeneration in SN was determined by immunohistochemical staining of tyrosine hydroxylase(TH). The numbers of TH-positive cells on nigral sections were not different from each groups(P>0.05). The densities of glial fibrillary acidic protein immunoreactivity from SN were similar between groups. TH-westen blotting showed no differences between treated animals and controls. In conclusion, the SNpc remains intact in Mn intoxication, and Mn-induced parkinsonism may be caused by damages of output pathways downstream to the nigrostriatal dopminergic system.

엎 클로스 앤드 퍼스널 : 확장연구자가 들려주는 학교연구의 이슈와 딜레마 Issuses and Dilemmas of Action Research in Korea Context

김영천,박찬봉,박일녀 한국교육인류학회 2002 교육인류학연구 Vol.5 No.2

교육현장연구에서 질적방법의 사용은 우리나라에서 최근에 시작되고 있다. 이에 이 글에서는 질적방법을 사용하여 현장의 개선을 목적으로 한 실행연구에 참여한 대학연구자 그리고 현장교사들의 경험은 어떠한 것이었는지를 이야기기법을 사용하여 소개한다. 이러한 논의를 통하여 우리나라의 학교현장연구에서 나타나는 실행연구의 이슈들은 무엇인지 그리고 실행연구를 통하여 연구자가 경험하는 딜레마들은 어떤 것이 있는지를 부각시키고자 한다. 미국을 포함한 선진국에서 학교개혁의 최선 아이디어로 부각되고 있는 실행연구를 우리의 현장에 적용하였을 때 그 이상과 비슷하게 우리의 현장연구자들도 그러한 결과를 가져왔는지 아니면 그 어떤 새로운 이슈와 딜레마들을 경험하였는지를 세 사람의 실제 이야기를 통하여 밝히고자 한다. Action research based on qualitative methods has just begun in Korean educational research. There is a scarcity of introduction and discussion of action researchers’ experiences in scholarly writings and journals. Thus, authors who have done action research for developing Performance assessment tools through collaborative research between one university professor and two classroom teachers try to introduce their lived experiences for three years. They include a variety of practical issues, dilemmas, and suggestions for more effective application and implementation of action research to Korean classrooms. For this purpose, three authors use story method to reveal and deliver their lived experiences, conflicts, and interpretations. One university professor tell readers his story about teaching action research methods to graduate students, and establishing a new community of action research among teacher researchers and graduate student researchers. Two elementary classroom teachers tell readers what they have experienced through participation in collaborative action research and how their understanding and attitudes toward action research and qualitative research method have dramatically changed.

수퍼차저에 의한 가솔린 機關의 性能에 관한 硏究

김동기,신이건,전봉준,박찬준 서울産業大學校 1995 논문집 Vol.41 No.1

The supercharging characteristics and the combustion performance of the spark iginition engine are investigated through the experiments. The apparatuses used in the experiment are the carburetor type 1468cc Gasoline Engine and the screw type supercharger. A supercharger pulley and a water pump pulley through V-belt are connected to the engine. The diameter of supercharger pulley is 63mm. The diameter of water pump pulley used are 63mm and 135mm,repectively.A optical senser is used to measured the speed of a engine. The pressure in first cylinder is measured. The rate of pressure rise and the rate of heat release are calculated. The engine speed considered is increased by 500rpm from 1500rpm to 3500rpm. It is found that the supercharging characteristics and the combustion performance in case of the engine with supercharger are increased at low speed range. Compared the supercharged engine with the natually aspirated engine, the most effects of supercharging on the torque and the rate of maximium pressure rise are observed at 2000rpm and 1500rpm, respectively.

김해시 하수종말처리장의 효율적 관리 및 시행 방안

김봉한,박찬목 인제대학교 1997 仁濟論叢 Vol.13 No.1

We examine the merits and demerits of various management methods of sewage works in Kimhae city. It is desirable to select the most efficient management method by comparing the cost-benefits of various ones. The most appropriate one can change drastically, depending on which criteria we would use to select. Even though the selection based on quantitative analysis is most desirable to employ, we can not develop any quantitative analysis of various management methods. Instead of quantitative analysis, we employ a qualitative analysis. The public financial condition of Kimhae city, the availability of technicians and the existing public utilities in Kimhae city are the most important factors that can affect the selection of the management method of sewage works in Kimhae city. We conclude that the sewage works in Kimhae city should be operated in the form of a local public corporation.

慶熙大學校 水源캠퍼스 基本計劃에 關한 硏究

金光來,泰熙成,安奉遠,金東贊 慶熙大學校 1980 論文集 Vol.10 No.-

Recently, in response to the demand for a increased effort in education of leader for the next generation, there has been a significant development in the planning of campus, which is the center of research and academic activities of the coming generation. Therefore, many institutions have tried expanding educational facilities both in terms of quality and quantity. But, there always should be more systematic consideration in drafting a campus master plan so that it can meet the demand of the times and future society. Thus, this research has been attempted in order to be prepared for adaptation to growth and change and to carry out the educational goals international current of studies and the characteristic of Suwon Campus, Kyung Hee University.

확장 칼만 필터를 이용한 동적 전기 임피던스 단층촬영법

김봉석,김경연,김민찬,이윤준 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 electrical impedance tomography (EIT). the resistivity(impedance) distribution of the unknown object is estimated from boundary voltages induced by different current patterns with various reconstruction algorithms. In this paper. we propose a dynamic EIT reconstruction algorithm based on the extended Kalman filter(EKF). The reconstruction problem is formulated as dynamic equation which consists of the state equation and the observation equation and the unknown state is estimated recursively with the aid of the EKF. Computer simulations for the 16-channel synthetic data are provided to illustrate the reconstruction performance of the proposed algorithm.

직류 서보 전동기를 대상으로한 적응퍼지속도제어기의 설계

김호찬,조성범,문동춘,고봉운 제주대학교 공과대학 첨단기술연구소 2001 尖端技術硏究所論文集 Vol.12 No.2

This paper presents a study of the performance of a DC servo motor with a model reference adaptive fuzzy speed controller (MRAFSC) in the presences of load disturbances. MRAFSC comprised inner feedback loop consisting of the fuzzy logic controller (FLC) and plant, and outer loop consisting of an adaptation mechanism which is designed for tuning a control rule of the FLC. Experimental results show the good performance in the DC servo motor system with the proposed adaptive fuzzy controller.

스트레스반응척도의 개발

고경봉,박중규,김찬형 대한신경정신의학회 2000 신경정신의학 Vol.39 No.4

연구목적: 본 연구의 목적은 4가지 스트레스반응 즉 감정적, 신체적, 인지적, 행동적 반응들이 포함된 스트레스 반응 척도를 개발하고자 하는데 있다. 방법: 일차로 성인 정상인 109명을 대상으로 스트레스반응척도 예비설문을 시행하여 75개 문항을 추출하였다. 2차로 이 문항들이 포함된 설문을 정상인 215명을 대상으로 실시하였다. 결과: 이 자료들을 요인분석한 결과 7개의 하위요인 즉 긴장, 공격성, 신체화, 분노, 우울, 피로, 좌절이 추출되었다. 상기 척도의 신뢰도는 정상인 62명에게 2주 간격으로 검사-재검사를 시행, 분석한 결과 7개 하위척도 점수와 척도 전체 점수 간의 상관관계수가 .69∼.96으로 모두 유의한 상관성을 보였다. 한편 내적 일치도는 7개 하위척도의 Cronbach's α가 .76∼.91, 척도 전체의 Cronbach's α가 .97이었다. 공존타당도는 global assessment of recent stress(GARS) scale, perceived stress questionnaire(PSQ), symptom checklist-90-R(SCL-90-R)의 전체지표 각각의 총점과 본 척도의 7개 하위척도의 점수 및 척도 전체점수 간의 상관성을 각각 비교한 결과 모두 유의하게 높은 것을 나타났다. 변별타당도는 환자군 242명(불안장애 71명, 우울장애 73명, 신체형장애 47명, 정신신체장애 51명)과 정상군 215명간에 척도의 총점과 7개의 하위척도 점수를 비교한 결과 공격성을 제외한 6개 하위척도 점수와 총점에서 각각 유의한 차이를 보였다. 환자군에서 우울장애군이 척도전체 점수가 가장 높고, 불안장애, 정신신체장애, 정상군보다 각각 전체 점수가 유의하게 높게 나타나 우울장애군이 이들 환자군 중에서 스트레스반응이 가장 현저하다는 것을 시사해 준다. 대상자들 중 여자가 남자보다, 소득수준이 낮을수록 척도 전체 점수가 유의하게 더 높았다. 결론: 이상의 결과들은 스트레스반응 척도가 신뢰도 및 타당도가 모두 유의한 수준으로 스트레스에 관련된 분야의 연구에 효과적으로 이용될 수 있는 도구임을 시사해 준다. 또한 우울장애군이 상기 다른 정신장애군에 비해 스트레스에 대한 감수성이 높다는 것을 반영해 준다. Objectives: The purpose of this study was to develop the stress response inventory(SRI)which includes emotional, somatic, cognitive, and behavioral stress responses, and then to use the scale in clinical pracitice. Methods: First, a preliminary survey was conducted for 109 healthy adults to obtain 70 response items. Second, a preliminary questionnaire was completed by 215 healthy subjects. Third, a comparison was made regarding stress responses among 242 patients(71 with anxiety disorder, 73 with depressive disorder, 47 with somatoform disorder, and 51 with psycho-somatic disorder) and 215 healthy subjects. Results: Factor analysis yielded 7 subscales : tension, aggression, somatization, anger, depre-ssion, fatigue and frustration. Reliability was computed by administering the SRI to 62 healthy subjects during a 2-week interval. Test-retest relivbility for 7 subscales and the total score was significantly hign, ranging between 0.69- .96. Internal consistency was computed, and Cronbach's α for 7 subscales ranged between .76-.91 and .97 for the total score. Concurrent validity was computed by correlating the 7 subscales and the total score with the total score of the global assessment of recent stress(GARS) scale, the perceived stress questionnaire(PSQ), and the symptom checklist-90revised(SCL-90-R). The correlations were all at significant levels. Discriminant validity was computed by comparing the total score and the 7 subscale scores of the patient and control groups. Significant differences were found for 6 subscales and the total score, with the exception being the aggression subscale. The depressive disorder group was highest in total scores of SRi among 4 patient groups, and showed a significant higher scores in total scores of SRI than each of anxiety disorder and psychosomatic disorder groups. In total scores of SRI, female subjects were significantly higher than male ones, and subjects with lower income were significantly higher than those with higher income. Conclusion: These results indicate that the SRI is highly reliable and valid, and that it can be utilized as an effective measure of stress for research in stress-related fields. It is suggested that depressive disorder group is more susceptible to stress than any other patient groups.

필기체 숫자인식의 최적 신경망 구조 설계를 위한 개선된 유전자 알고리즘

박찬란,김향태,정재영,위승정,최봉한,최호진,이웅기 조선대학교 통계연구소 1999 統計硏究所論文誌 Vol.1 No.1

본 논문에서는 필기체 숫자인식의 최적 신경망 구조 설계를 위하여 유전자 알고리즘과 역전파 알고리즘을 병합하는 방법을 이용하였으며, 유전자 알고리즘은 유전인자의 역할에 따라 독립적으로 적응하는 개선된 선택, 교배, 돌연변이 연산자를 제안하였다. 실험결과는 유전인자의 역할에 적응하는 개선된 연산자들의 실행으로 최적의 신경망 구조를 설계하였고, 설계된 신경망 구조에서의 학습이 가장 좋은 성능을 나타내었다. In this study, the method of using both genetic algorithm and back propagation is proposed to design the structure of optimal neural network recognizing handwritten digits. Improved selection, crossover and mutation operator which can control the genetic algorithm independently according to the role of gene are used in the proposed method. Simulation result shows that the neural network of this method can search effectively the optimal hidden node numbers, connection weight, learning rate and the momentum because of above proposed operators.