Park's 벡터 패턴의 왜곡률을 이용한 고정자 권선 고장 자동진단

宋明現(Myung-Hyun Song),朴奎南(Kyu-Nam Park),韓東奇(Dong-Gi Han),梁哲午(Chul-Oh Yang) 대한전기학회 2008 전기학회논문지 P Vol.57 No.2

In this paper, an auto-diagnosis method of the stator winding fault for small induction motor is suggested. 3-phase stator currents are sampled, filtered, and transformed with Park's vector transformation. After then Park's vector patterns are obtained. To detect the stator winding fault automatically, a distortion ratio is newly defined and compared with the one of healthy motor, and the threshold levels of distortion ratio are suggested. The 2-turn, 4-tum, 8-turn winding fault are tested with no load, 25%, 50%, 75%, and 100% rated load. The distortion ratio of the Park's vector patterns are increased as the increase of the faulted turns. but are same as the increase of the load.

유도전동기의 고정자 권선고장 진단을 위한 팍스벡터 패턴의 왜곡률 연산에 대한 연구

양철오(Chul-Oh Yang),박규남(Kyu-Nam Park),송명현(Myung-Hyun Song) 대한전기학회 2012 전기학회논문지 Vol.61 No.4

The diagnosis technique of stator winding faults based on Motor Current Signature Analysis(MCSA) was suggested. Park"s vector pattern, the circle that is drawn by d-q transformed currents(i_d, i_q), is widely used for stator winding faults detection. The current Distortion Ratio(DR), defined by the ratio of max?axis and min?axis of ellipse of Park"s vector"s pattern, was more simple and powerful method than the Park’s vector pattern. In this study, a calculation method of distortion ratio of Park"s vector pattern was suggested for auto diagnosis of stator winding short fault and usefulness of suggested calculation method of distortion ratio was verified through simulation using LabVIEW program.

한국인 직무 스트레스 측정도구의 개발 및 표준화

장세진,고상백,강동묵,김성아,강명근,이철갑,정진주,조정진,손미아,채창호,김정원,김정일,김형수,노상철,박재범,우종민,김수영,김정연,하미나,박정선,이경용,김형렬,공정옥,김인아,김정수,박준호,현숙정,손동국 大韓産業醫學會 2005 대한직업환경의학회지 Vol.17 No.4

Background and Purposes: Over the past three decades, numerous studies performed in Korea have reported that job stress is a determinant risk factor for chronic diseases and work disability. Every society has its own culture and occupational climate particular to their organizations, and hence experiences different occupational stress. An occupational stress measurement tool therefore needs to be developed to estimate it objectively. The purpose of this study is to develop and standardize the Korean Occupational Stress Scale (KOSS) which is considered to be unique and specific occupational stressors in Korean employees. Subjects and Methods: Data were obtained from the National Study for Development and Standardization of Occupational Stress (NSDSOS Project: 2002-2004). A total of 12,631 employees from a nationwide sample proportional to the Korean Standard Industrial Classification and the Korean Standard Occupational Classification were administered. The KOSS was developed for 2 years (2002-2004). In the first year, we collected 255 items from the most popular job stress measurement tools such as JCQ, ERI, NIOSH and OSI, and 44 items derived from the a qualitative study (depth interview). Forty-three items of KOSS, in the second year, were retained for use in the final version of the KOSS by using Delphi and factor analysis. Items were scored using conventional 1-2-3-4 Likert scores for the response categories. Results: We developed eight subscales by using factor analysis and validation process: physical environment (3 items), job demand (8 items), insufficient job control (5 items), interpersonal conflict (4 items), job insecurity (6 items), organizational system (7 items), lack of reward (6 items), and occupational climate (4 items). Together they explained 50.0% of total variance. Internal consistency alpha scores were ranged from 0.51 to 0.82. Twenty-four items of the short form of the KOSS (KOSS-SF) were also developed to estimate job stress in the work setting. Because the levels of the subscales of occupational stress were gender dependent, gender-specific standard norms for both the 43-item full version and the 24-item short form using a quartile for the subscales of KOSS were presented. Conclusion: The results of this study suggest that KOSS might be an appropriate measurement scale to estimate occupational stress of Korean employees. Further and more detailed study needs to be conducted to improve the validity of this scale.

정신분열병에 대한 리스페리돈의 효과 및 안정성

이민수,김용구,김영훈,연병길,오병훈,윤도준,윤진상,이철,정희연,강병조,김광수,김동언,김명정,김상훈,김희철,나철,노승호,민경준,박기창,박두병,백기청,백인호,손봉기,손진욱,양병환,양창국,우행원,이정호,이종범,이홍식,임기영,전태연,정영조,정영철,정인과,정인원,지익성,채정호,한상익,한선호,한진희,서광윤 大韓神經精神醫學會 1998 신경정신의학 Vol.37 No.1

연구목적 : 본 시험의 목적은 임상시험 시작전에 연구자들을 대상으로 PANSS Workshop을 통하여 PANSS, ESRS에 대한 국내에서의 표준화 작업을 구축하고 새로운 정신병 치료제인 리스페리돈의 효과와 안정성을 재확인하여 리스페리돈 사용에 대한 적정화를 이루는데 있다. 연구방법 : 1996년 4월부터 1996년 9월까지 국내 39개 대학병원 정신과에 입원중인 혹은 증상이 악화되어 입원하는 정신분열병 환자 377명을 대상으로 다시설 개방 연구를 시행하였다. 1주일간의 약물 배설기간을 가진후, 리스페리돈을 8주간 투여하였고, 기준점, 1주, 2주, 4주, 그리고 8주후에 평가되었다. 용량은 제1일에는 리스페리돈 1mg씩 1일 2회, 제2일에는 2mg씩 1일 2회, 제3∼7일에는 3mg씩 1일 2회 투여하였다. 이후 환자의 임상상태에 따라 임의로 증량할 수 있으며, 최대 일일 16mg을 초과하지 않도록 하였다. 추체외로 증상을 조절하기 위한 투약을 허용하였다. 임상증상 및 부작용의 평가는 PANSS(Positive and Negative Syndrome Scale), CGI(Clinical Global Impression) 그리고 ESRS(Extrapyramidal Symptom Rating Scale)을 사용하였다. 연구결과 : 377명중 343명(91%)이 8주간의 연구를 완결하였다. 치료 종결시점인 8주후 PANSS 총점수가 20% 이상 호전된 경우를 약물 반응군으로 정의할때, 약물반응군은 81.3%였다. 리스페리돈에 반응하는 예측인자로는 발병연령, 이전의 입원 횟수, 유병기간이 관련 있었다. 리스페리돈은 1주후부터 PANSS양성, 음성, 및 일반정신병리 점수상에 유의한 호전을 보여 효과가 빨랐다. CGI의 경우도 기준점에 비해 1주후부터 유의한 감소를 나타내었다. ESRS의 경우, 파킨슨 평가점수는 기준점과 비교해 투여 1주, 2주, 4주후 유의하게 증가되었다가 8주후 기준점과 차이가 없었다. Dystonia 평가점수는 1주후만 유의한 증가를 보였으며, dyskinesia 평가점수는 유의한 차이가 없었다. 혈압, 맥박수의 생명징후 및 일반 혈액학 검사, 생화학적 검사, 심전도 검사에서 유의한 변화는 없었다. 결 론 : 이상의 다시설 개방 임상 연구를 통해 리스페리돈은 정신분열병 환자에서 양성증상뿐만 아니라 음성증상 및 전반적인 증상에도 효과적인 것으로 사료된다. 보다 명확한 평가를 위해서는 다른 항정신병약물과의 이중맹검 연구가 필요할 것으로 생각되며, 또한 장기적 치료에 대한 평가도 함께 이루어져야 하겠다. Objective : The purpose of this study was to investigate the efficacy and safety of risperidone in the treatment of Korean schizophrenic patients. Method : This multicenter open study included 377 schizophrenic patients drawn from 39 university hospitals. After a wash-out period of 1 week, the schizophrenic patients were treated with risperidone for 8 weeks and evaluated at 5 points ; at baseline, and 1, 2, 4 and 8 weeks of treatment. The dose was increased from 2mg/day(1mg twice daily) to 6mg/day(3mg twice daily) during the first week and adjusted to a maximum of 16mg/day over the next 7 weeks according to the patient's clinical response. Medication to control extrapyramidal symptoms was permitted. The psychiatric and neurological status of the patients was assessed by PANSS, CGI, and ESRS scales. Results : 343(91%) of 377 patients completed the 8-week trial period. Clinical improvement, as defined by a 20% or more reduction in total PANSS score at end point, was shown by 81.3% of patients. The predictors of response to risperidone were associated older age, shorter duration of illness, fewer previous hospitalization. Risperidone had rapid onset of action ; a significant decrease of the total PANSS and three PANSS factor(positive, negative, general), and CGI was already noticed at the end of first week. For the ESRS, parkinsonism rating scores were significantly increased until week 4 comparing with baseline. Dystonia rating scores were significantly increased until week 1, and dyskinesia rating scores were not significantly changed during the study. Laboratory parameters including vital sign, EKG, hematological, and biochemical values showed no significant changes during the trial. Conclusions : This study suggests that risperidone is generally safe and effective against both the positive and negative symptoms in our group of patients.

해부-신경생리학적 Monitoring을 통한 뇌중심 영역수술의 고찰

박명찬,박철형,김형일,이정청,김동찬,송희선 대한신경외과학회 1994 Journal of Korean neurosurgical society Vol.23 No.6

In the surgery of central area, idenwg the motor cortex in front of central sulcus is imperative to prevent loss of motor function. Twenty five patients with tumors or intractable epilepsy near the central sulcus were operated on at the Department of Neurosurgery of Chonbuk National University Hospital, from September. 1991 to December 1993. An estimated localization of lesions was performed with Callosal Grid System, which is a methodolgy made available by the development of high quality of magnetic resonance imaging, digital subtraction angiography and high resolution computerized tomography. This system allowed us to be oriented to the motor cortex as well as permitted assessment of the extent of resection. This was further delineated by direct electrical stimulation, which confirmed the functional motor cortex and made it possible to maximized the tumor resection near and in the motor cortex The combination of direct cortical stimulation (functional mapping) and the use of the Callosal Grid System (anatomical mapping) allowed us to idene the spatial relationship between them as well as to maximize the tumor resection in most cases without injury to the central area, so that the better outcome is guaranted.

간호사의 근골격계질환 증상유병정도 및 관련요인

박종,강명근,이영선,강성득,김철호 朝鮮大學校 附設 醫學硏究所 2003 The Medical Journal of Chosun University Vol.28 No.2

Objectives : The purpose of this study were to identify musculoskeletal symptom among nurses in a hospital and to explore its related factors . Methods : A self-administered questionnaire survey including work condition and presence of musculoskeletal symptom was made toward 190 nurses at a university hospital. Results : The prevalence of musculoskeletal symptom was calculated as 20.4% at neck, 27.7% at shoulder, 15.7% at arm or hand and 29.3% at leg. By multiple logistic regression, the prevalence of musculoskeletal symptom was 3.57 times (95% CI : 1.53 - 8.35) higher among persons with general illness symptom than persons without symptom, 2.99 times (95% CI : 1.22-7.36) higher among persons with psycho-rieuro subjective symptom than without symptom, 3.48 times (95% CI : 1.46 - 8.27) higher among irregular menstruation period than regular period. The subjective symptom prevalence at the shoulder was 2.24 times (95% CI : 1.06 - 4.71) among persons with past history of certain chronic diseases than without the history. The prevalence at the upper arm was 4.60 times (95 % CI : 1.24 - 17.08) higher among persons drinking two cups of coffee a day and 9. 92 times (95 % CI : 2.28 - 34.91) higher than persons who drank a cup of coffee a day or less. The prevalence of backache was 3.18 times (95 % CI : 1.10 - 11.01) higher among 30-34 year old group than group less than 25 years old persons. The prevalence of subjective symptom at leg showed 3.93 times (95% CI : 1.44 - 10.71) higher among persons with irregular menstruation period than regular period. Conclusion : Many nurses under study had musculoskeletal symptom and the symptom was related with complicated combination of general characteristics, subjective symptom at other site, occupational characteristics and characteristics related with diseases, by various site of the system. Therefore appropriate intervention programs are needed ot be developed to prevent musculoskeletal illness among nurses.

Park's Vector Pattern의 왜곡률 분석에 의한 BLDC 모터의 권선 고장진단

이대성(Dae-Seong Lee),김준영(Jun-Yong Kim),양철오(Chul-Oh Yang),송명현(Myung-Hyun Song),박규남(Song, Kyu-Nam Park) 대한전기학회 2013 대한전기학회 학술대회 논문집 Vol.2013 No.7

취업에 관한 재학생 의식조사

박영철,사명규,김정겸 충남대학교 1993 學生生活硏究 Vol.20 No.-

지금까지 분석한 내용을 항목 별로 요약한 뒤 그에 따른 몇가지 제언을 하고자 한다. 1. 직업관과 관련해서는 직업을 갖는 목적으로는 자아실현이라는 이상적인 면과 경제적인 안정을 희구하는 현실적인 면이 혼재하고 있다. 이러한 경향은 그들이 취업하기를 희망하는 업종과 직종에서도 나타나고 있다. 그리고 성공적인 직장생활을 위해서중요한 요소로는 실력보다는 원만한 성격 및 대인관계나 성실성과 끈기 같은 것을 꼽고 있다. 이러한 점을 고려할 때 취업안내를 위한 프로그램을 취업시기에 임박해서 정보 안내 위주의 활동보다는 장기적이고 지속적인 안목에서 건실한 직업관 정립, 원만하고 성실한 인간성을 함양하는데 도움을 줄 수 있는 프로그램의 개발 및 시행이 요망된다. 2. 취업정보 및 상담대상에서는, 주된 취업상담대상이나 취업정보를 얻는 대상이 학교의 공식적인 기구는 극히 미약했고 오힐혀 사적인 관계나, 외부기관에 많이 의존하고 있었다. 자세히 알고 싶은 취업정보에는 취업준비에 직결된 정보과 취업기관 선정에 관련된 정보가 주류를 이루었다. 본교의 취업대책에 대한 만족도가 극히 낮았으며, 보강해야할 취업대책으로는 본교 출신들을 위한 대외 홍보 및 종합적인 취업대책기구의 설립을 바라고 있었으며, 취업 안내 프로그램의 편성과 관련하여서는 학교의공식적인 기구는 전교적 차원에서의 취업활동을, 단과 대학과 학생회는 각 대학의 특수성에 입각한 프로그램의 운영을, 그리고 신입생 오리엔테이션내용중에 주로 건전한 직업관 정립에도움을 주는 취업안내 내용의 포함 필요성을 인식하고 있다. 이러한 점을 고려해 볼 때, 우리학교 차원의 취업대책에 대한 근본적인 재검토와 아울러 각종 취업 관련기관들의 기능과 역할을 재조정함고 아울러 학생들에게 광범한 홍보를 통해서 공식적인 기구의 이용율의 제고를 촉진할 수 있어야 겠다. 아울러 신입생 오리엔테이션 프로그램속에도 취업에 관련되는 내용을 포함시키는 데 대한 충분한 검토가 뒤따라야겠다. 3. 취업여건 및 채용방법에서는, 먼저 취업여건의 악화는 외부적인 제 용인에 힘입은 바가 크지만, 이의 극복을 위해서는 학생들 자신이 적극적으로 실력을 향상함과 아울러 지방대학 졸업자로서 받게외는 불이익을 극복하기 위해서 거교적 차원에서의 홍보 필요성을 강조하고 잇다. 한편 바람직한 사원채용방법으로는 대체로 공개전형을 선호하고 있다. 한편 최근에 도입되고 잇는 인터사우너제에 대해서는 인턴사원으로뽑힐 수 있는 기회가 공평하게주어진다는 전제하에 상당히 긍정적으로 받아들이고 있다. 이러한 점과 관련해서는 학교차원에서는 활발한 대외 홍보를 통하여 본교출신들이 취업에서 겨룰수 있도록 종합적이고 지속적인 노력이 필요하며, 아울러 학생들이 우수한 자질을 연마할 수 있는 교육여건을 충분히 마련해 주는데 힘써야 겠다. 4. 취업 및 진로준비와 관련해서는, 대부분의 학생들이 졸업 후 취업을 하기를 희망하고 있으며, 진로를 결정하는 시기는 2학년 말이 가장 높았으며, 아울러 취업에대해서는 구체적으로 생각하는 시기도 주로 2학년 말이 가장 높았다. 그리고 취업준비를 시작하는 시기는 3학년 1학기가 가장 높았다. 한편 전공공부와 취업준비 공부를 해야 한다고 반응하였다. 그런데 실제로 취업을 위한 준비는 영어공부를 하는 정도이고, 계획을 세워서 철저히 하고 있는 학생들은 아주 소수였다. 이러한 점과 관련해서는, 학생들의 취업을 위한 안내를 취업이 임박한 식기에 수동적으로 찾아오는 삭생들을 상대로 정보를 소개해 주는 것을 탈피하고, 장기적 안목에서 종합적인 계획하에 효과적인 취업을 위한 프로그램의 개발 및 실시가 요망된다 5. 직업선택요건에서는 대체적으로 자기의 흥미나, 적성 또는 자아실현이 가능한 직업을 얻게될 때까지 기다리겠다는 학생들의 비율이 높았으며, 따라서 직업을 선택할 때에도, 그리고 취업할 기업체를 선택할 때에도 이러한 점이 고려의 요소로서 높은 비중을 차지하고 있다. 한편 취업대상기업체를 선정할 때에도 안정된 근무조건, 성장ㆍ발달가능성, 유리한 급여조건 등을 관심이 있는 학생들은 중소기업체를 선호하고 있다. 이러한 점과 관련해서는, 학생들이 대학생활을 영위하는 중에 자기자신에 대한 적성, 소질 및 장래의 희망등을 자기자신의 인생설계에 따라 명확히 하는데 도움을 줄 수 있는 프로그램의 개발 실행을 요한다.

주체철학의 인간이해와 그 평가

박명철 연세대학교 통일연구원 1999 통일연구 Vol.3 No.2

This essay deals with the understanding of human beings in Juche-philosophy that has dominated the North Korean society more than half a century.Emphasizing to build up a socilist society and human beings fitting to this society, North Korean has proclaimed, in particular, her idea of remaking human beings.Therefore, this essay examines the basic framework, such as how Juche-philosophy understands human beings, and how this understanding supports ideologically to its social reformation and political system.This attempt will be the foundation to understand the North Korean's value-system, way of thinking, and structure of consciousness, and also contribute to mutual embrace between North Koreans and South Koreans for reunification. In terms of perspective to see North Korean as well as methodology to approach this issue, the author used critical immanent approach that let North Koreans tell themselves and then criticize their logic and theory.The criticism was also done by socialists, such as Karl Marx and Ludwig Feuerbach, and this author added some comments. In the second section of this essay, socio-political background of Juche-philosophy, i.e.the process and content of "Juche socialism" since the establishment of "socialist system" by proclamation of socialist constitution in 1972, was discussed.And then the anthropology of Juche-philosophy was analyzed: the "philosophical principle" of Juche idea, the thesis the "humans are subjects of everything"; concepts and interrelations of three attributes of human beings, i.e."independence", "creativity", "consciousness"; th defference between "sociopolitical life" and "sociopolitical organism", and its theoretical link with the Party and the Leader.These themes were defined and analyzed, and then the criticism from the socialist perspective through Karl Mark and Ludwig Geuerbach was attempted. In the third section, problems raised by Juche anthropology were arranged as the following four thesis.Thesis 1, people's hope: "humans become subjects of the world"; thesis 1, people's hope: "humans become subjects of history"; thesis 3.use of violence and sufferings of "revolutionary humans"; thesis 4.dual ethical rule: "one for all, all for one".These theses were examined from the perspective of social ethics, and their criticism was added. In the fourth section, as the conclusion, the limit of this research and future tasks, as well as this suthor's suggestions, were added in the hope of future reunification of humans between North and South.On the limit of this research, this author noted "critical immanent approach" based on written sources in a situation of little interactions between North and South.To its complement, in case of Germany after unification, socio-psychological and psychotherapic researches on the lod east Germans are being seriously undertaken, this author hope that such researches should be done in Korea.And a brief introduction of an encouraging aspect by psychotherapic researches on those who fled from North Korea and emigrated to South Korea was added.

니켈과 코발트를 함유한 황산용액으로부터 Cyanex 272에 의한 코발트의 용매추출

박경호,정선희,남철우,신선명,김동수 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.11

The solvent extraction to separate and recover cobalt and nickel from sulfuric acid solution was studied using Cyanex 272 in kerosene. The solution processed was equivalent to that expected from leaching of a matte, intermediate product of manganese nodules. The extraction of both metals increased with increasing equilibrium pH and extractant concentration. However, cobalt was preferentially extracted over nickel. The extraction efficiencies of cobalt and nickel were 80% and 1.9% respectively with 0.2M Cyanex and O/A of 1 at equilibrium pH 5.0. The separation factor of Co/Ni increased with raising the extraction temperature (205 at 20℃, and at 441 at 50℃). The saponification of Cynanex 272 increased the extraction of cobalt due to the increase of equilibrium pH. Nickel (0.40 g/l) loaded in an organic phase could be scrubbed with a solution containing 10 g/l Co at equilibrium pH of 6.0. The stage numbers and cobalt recoveries in extraction and stripping processes required for the counter current operations are predicted using the equilibrium isotherm plots. (Received May 19, 2004)