Multivariate control charts for mean vector and covariance matrix with supplementary runs rules

오인호,조교영 한국데이터정보과학회 2022 한국데이터정보과학회지 Vol.33 No.2

The Shewhart control chart developed to statistically control the production process is not implemented in the actual process. It is simple and has the advantage of effectively detecting large shifts. But it is not effective in small shifts. To compensate for this, there are many several methods. In 1956, Western Electric Company presented a control chart with runs-rules added. In this paper, to compensate for the shortcomings of traditional Shewhart charts, we propose a chart for monitoring the mean vector and covariance matrix using runs rules proposed by Western Electric Company. In the run length distribution of the control chart to which the finite Markov chain embedding method and run rule were applied, it was confirmed that the mean of the run length rapidly decreased even with a small shift of the mean vector and covariance matrix. It is sensitive to small shifts. Therefore, it can be seen that the Shewhart control chart using runs rules in the production process is effective in detecting small fluctuations.

부산지역 의과대학생을 대상으로 한 응급처치 및 심폐소생술 교육 경험

오인호,이상엽,민홍기,김영주,임지향,김형회,전태용,김윤진,조석주,배석주 한국의학교육학회 2005 Korean journal of medical education Vol.17 No.1

Purpose: The aim of this study was to describe the experience of teaching emergency management and cardiopulmonary resuscitation to medical students in Busan. Methods: Study participants were 59 medical students in Busan. An eight-day curriculum in the emergency management and cardiopulmonary resuscitation was developed. They completed all class sessions and two drill/practical examinations taught by our interdisciplinary team from July 21 through 30, 2003. Each class is approximately 2 hours and reading assignments are given at the end of each class. Also included are practical, table-top and team-building exercises. The participants completed self-reported questionnaires for the education. Results: About establishment and environment of the education, respondents answered with `very good' were 14%. About overall theoretical lecture, respondents answered with `very helpful' were lower than 40%. Especially, favorable evaluation for the medical lectures was lower than that of other lectures. Students generally enjoyed their emergency medicine experience as it is often their first opportunity to assume primary responsibility for patient care. About overall practices, respondents answered with 'very helpful' were higher than 60%. Conclusion: The authors found that medical students prefer opportunities to hone procedural skills than to hear theoretical lectures. Also, medical students are welcome to hear theoretical lectures that consists of emergency management related contents, not academically medical contents. This curriculum should be tailored to fulfill learner's requirements.

전자 유압식 비례 교축 제어 밸브의 특성

오인호,이일영 한국마린엔지니어링학회 1993 한국마린엔지니어링학회지 Vol.17 No.4

Nowadays, the cartridge valve can be controlled proportionally in remote place by adopting proportional solenoid and it becomes widely used as control component in hydraulic systems. Especially, multi stage proportional valve is attractive because it consumes less input power though its characteristics might slightly be defected. But, the system parameter should be carefully chosen to obtain optimistic characteristics. This study concerning three stage proportional throttle control valve is purposed to examine the influences of paameters to the dynamic characteristics. The typical transient and frequency responses of proportional throttle control valve were inspected through the experiments and compared to those derived from the theoritical analyses. And it was confirmed that the analyses are appropriate. Then the influences of various system parameters to the dynamic characteristics were examined by means of simulations. For the analyses, the basic equations derived from lumped model were linearized and the linearized equations were transformed to the transfer functions between inputs and outputs. Then the transient responses and frequency responses were obtained from transfer functions. 1. It is appropriate to estimate the dynamic characteristics of valve which has relatively sophisticated structure by means of system analyses using linearized equations. 2. Though the valve has two pilot stages, fairly good characteristics can be obtained by carefully choosing system parameters. 3. Main valve very quickly follows the movement of second pilot valve when the parameters of main valve(the oil supply passage and discharge passage fpr second pilot valve) are appropriately chosen.

태국 태권도장 개관 및 경영에 관한 사례 연구

오인호,최현민,윤수한 한국태국학회 2014 한국태국학회논총 Vol.21 No.1

In this study, in-depth interviews with two Koreans who have opened and are operating Taekwondo schools in Thailand are conducted for the case analysis. And SWOT analysis is performed to analyze the contents of in-depth interviews for the study result. According to the analysis, for BHK, the sparring training capability, the convenient facility, the program customized for sparring and the systematically integrated web site are found to be the strength factors. As the weak factors that are inherent in the study participant"s operation of Taekwondo school, the expensive training cost and the danger for contract by using other"s name are noted. As the threat factor from the external environment of the subject school, the problem of contract and the country"s policy are found. In case of CYS, "the programs" variety", "the modernized facility", "the security of loyal customer" and "the efficiency from the previous experiences" are found to be the strangth factors for the internal environment. For the weak factors, "the insufficient outdoor parking lot" and "the high operation cost" are found. "The use of waiting time and the location in department stores" and "the promotions of loyal customers" are found to be the opportunity factors of the external environment. And "other schools" openings in shopping centers" is the treat factor of the external environment. For the strategy of the Taekwondo schools, WT, SO strategy is proposed.

비례압력제어밸브의 부하압력 피드백방법 개선에 관한 연구

오인호,장지성,이일영,정대종,조성현,Oh, In-Ho,Jang, Ji-Seongng,Lee, Ill-Yeong,Chung, Dai-Jong,Cho, Sung-Hyun 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.5

The proportional pressure control valve having versatile functions and higher performance is an essential conponent in the open loop controlled rear wheel steering gear of the four wheel steering system in a passenger car. In this study, the authors suggest a new type of load pressure feedback mechanism which can make it easy to change the range of controlled pressure without changing the capacity of solenoid. The concept of suggested mechanism, composed of the pressure chamber with throttles in series, was described. The mathematical model was derived from the rear wheel steering gear consisting of a valve and a cylinder for the purpose of analyzing the valve characteristics. And the programme for computing the characteristic of the valve was developed. Experiments were performed to confirm the performance of the valve and computations were carried out to ascertain the usefulness of the developed programme. The results from computations fairly coincide with those from experiments. And the results from experiments and computations show that the performance of new valve was as good as that of the already developed one and the new valve has advantages such as the easiness of changing the range of controlled pressure and the decrease of power loss at neutral position without the decline of performance.

전자 유압식 비례 교축 제어 밸브의 특성

오인호 부산수산대학교 산업기술연구소 1993 産業技術硏究所 硏究報告 Vol.4 No.2

TMS320C6711 프로세서를 이용한 RFID 리더 시스템의 다상 필터를 이용한 채널화기 구현

오인호(In-Ho Oh),황태욱(Tae-Wook Hwang),송병관(Byoung-Gwan Song),김지희(Ji-Hee Kim),함성진(Sung-Jin Ham),김영수(Young-Soo Kim) 한국통신학회 2007 한국통신학회 학술대회논문집 Vol.2007 No.7

시상주변 양성 수막종의 완전절제후 비정형 수막종으로의 급속한 악성변환

오인호 ( In Ho Oh ),최석근 ( Seok Keun Choi ),박봉진 ( Bong Jin Park ),김태성 ( Tae Sung Kim ),임영진 ( Young Jin Lim ) 대한뇌종양학회·대한신경종양학회·대한소아뇌종양학회 2008 대한뇌종양학회지 Vol.7 No.2

A 45 year-old man was admitted due to early recurrent parasagittal meningioma with malignant transformation 22 months after initial total tumor resection. The initial surgical specimen was diagnosed as meningotheliomatous meningioma which had no malignant features. Brain magnetic resonance imaging(MRI) showed a recurrent tumor located at the same area of the prior surgery. After second operation, the tumor was pathologically compatible to atypical meningioma. It is rare for a benign meningioma to recur with malignant transformation shortly after surgery. Surgeon should keep in mind that benign meningioma can transform to aggressive tumor in short term and intermittent imaging follow up is needed.

부산지역 의과대학생을 대상으로 한 응급처치 및 심폐소생술 교육 경험

오인호(In-Ho Oh),이상엽(Sangyeoup Lee),민홍기(Hong-Gi Min),김영주(Young-Joo Kim),임지향(Jie-Hyang Lim),김형회(Hyoung Hoi Kim),전태용(Tae Yong Jeon),김윤진(Yun-Jin Kim),조석주(Suk-Ju Jo),배석주(Suk-Ju Bae) 한국의학교육학회 2005 Korean journal of medical education Vol.17 No.1

Purpose: The aim of this study was to describe the experience of teaching emergency management and cardiopulmonary resuscitation to medical students in Busan. Methods: Study participants were 59 medical students in Busan. An eight-day curriculum in the emergency management and cardiopulmonary resuscitation was developed. They completed all class sessions and two drill/practical examinations taught by our interdisciplinary team from July 21 through 30, 2003. Each class is approximately 2 hours and reading assignments are given at the end of each class. Also included are practical, table-top and team-building exercises. The participants completed self-reported questionnaires for the education. Results: About establishment and environment of the education, respondents answered with `very good were 14%. About overall theoretical lecture, respondents answered with `very helpful were lower than 40%. Especially, favorable evaluation for the medical lectures was lower than that of other lectures. Students generally enjoyed their emergency medicine experience as it is often their first opportunity to assume primary responsibility for patient care. About overall practices, respondents answered with very helpful were higher than 60%. Conclusion: The authors found that medical students prefer opportunities to hone procedural skills than to hear theoretical lectures. Also, medical students are welcome to hear theoretical lectures that consists of emergency management related contents, not academically medical contents. This curriculum should be tailored to fulfill learner s requirements.

전자 유압식 후륜 조향 장치의 응답 특성 개선에 관한 연구

오인호(I. H. Oh),양경욱(K. U. Yang),이일영(I. Y. Lee) 한국자동차공학회 1997 한국 자동차공학회논문집 Vol.5 No.6

The feedback control scheme of the pressure control system of the rear wheel steering gear which has relatively large volume and sprung load was built up in order to improve the response characteristic of the system. The control algorithm chosen was a feedback compensator joined by a feedfoward compensator and the model matching method was used in the process of control system design. The structures and properties of the reference models were inspected and the parameters of the controller were decided. The improvement of the response characteristic of the pressure control valve by means of the feedback control is affirmed. Particularly, when the order of the system model is higher than the 2nd order, the effectiveness of the feedback control on the improvement of the response characteristic of the valve is distinct. And the convenience of the model matching method in the process of control system design is confirmed as well.<br/>