• The Transactions of The Korean Institute of Electrical Engineers
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• v.61 no.4
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• pp.643-649
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• 2012

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.

• Proceedings of the KIEE Conference
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• 2005.05a
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• pp.36-38
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• 2005

Photodynamic diagnosis is a modern method for the fluorescence imaging of cancer. 5-ALA induced protoporphyrin IX fluorescence benefits the tumour selective accumulation of protoporphyrin ; therefore, tumours can be differentiated from healthy tissue. This paper develops Photodynamic diagnosis (PDD) system about ALA that apply tissue absorption coefficient. About other photosensitizer, application capacitate. In this paper, we will expect effective result by working PDD with PDT (photodynamic therapy) system that is a therapy device of cancer.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1997.04a
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• pp.677-682
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• 1997

Vibration diagnosis of steam turbine generator is essential for safe operation. For a fast few decades, several data base systems for diagnosis of steam turbine generators have been developed and proved useful. However, there still remains a problem in using data base systems such that they require an expert engineer who has a deep insight or knowledg into the system. Moreover,such data base systems can not give any information if the input is not completely fit with data base. This paper presents an effective method for vibration diagnosis of steam turbine generators using fuzzy inference. The proposed method includes also a strategy to overcome the drawback of data base system such that one cannot obtain any information when the input is insufficient or not exact. A computer program is written to realize the entire procedure for the diagnosis. Three realistic problems are dealt with to show the effectiveness of the proposed method.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2002.10a
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• pp.7-10
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• 2002

The diagnosis of faults of machine tool, which is controlled by CNC and PLC, is generally based on ladder diagram of PLC. Because sequential controls for CNC and servo motor are mostly processed in PLC. However, when fault is occurred, a searching for logical relation to fault reasons is required a lot of fault experiences and times, because PLC program has step structure. In this paper, FDS(Fault Diagnosis System) is developed and implemented to machine tool with open architecture controller in order to find the reason of fault lastly and correctly. The diagnosed reasons for fault are tele-serviced on web through developed RSS(Remote Service System). The operationability and usefulness of developed system are evaluated on specially manufactured machine tool with open architecture CNC. The results of this research can be the model of remote monitoring and fault diagnosis system of machine tool with open architecture CNC.

• The Journal of Korean Medicine
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• v.27 no.2 s.66
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• pp.23-35
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• 2006

Objectives : This study examined the reliability of disease mechanism diagnosis, to evaluate items of questionnaires and inquire about the relationships between disease mechanisms and 'diagnosis program' questionnaires used for the objective diagnosis of Oriental medicine in the department of Oriental OB&GYN, Oriental Medical Hospital of Dongeui University. Method : We analyzed the results of questionnaires from 3504 outpatients of OB&GYN disease at the Oriental Medical Hospital of Dongeui University from April 2000 to April 2005. Results & Conclusions : 1. The research questionnaire had 188 questions, the summary questionnaire 137, and the diagnosis questionnaire 80. 2. The reliability of all questionnaires shows above 90% in deficiency of qi, deficiency of Yin, insufficiency of Yang coldness heat syndrome liver and spleen kidney in all, 8 case disease mechanisms. These are higher in the diagnosis questionnaires than in the research questionnaires and the summary questionnaires, except for kidney disease mechanism. 3. Cronbach a of the questionnaires decreased, especially blood deficiency, phlegm, heat syndrome, and insufficiency of Yang; these 4 case disease mechanisms were lower than 0.6. 4. For degree of correspondence of meeting points, both. the diagnosis and the summary questionnaires were above 80% with the exception of the 2 case disease mechanisms heart and blood deficiency. The meeting points of both the diagnosis and research questionnaires were above 80% in the to case disease mechanisms deficiency of qi blood stasis deficiency of Yim insufficiency of Yang damp dryness liver spleen kidney phlegm. 5. The change in the result values of questionnaires was a decreased level of deficiency of qi heat syndrome phlegm damp kidney and raised level of coldness heart disorder of qi dryness 6. The computation degree of disease mechanism in DSOM(r) D.1.1 was much lower on phlegm deficiency of qi heat syndrome disorder of blood, somewhat lower on insufficiency of Yang and higher on coldness than in the two different questionnaires.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.23 no.4
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• pp.62-71
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• 2009

In this paper, we propose a fault diagnosis algorithm for BLDC motors by principle component analysis (PCA) and implement a real-time fault diagnosis system for BLDC motors. To verify the proposed diagnosis algorithm, various faulty data are acquired by Lab VIEW program from experimental system. We extract a fault feature using principle component analysis after preprocessing and then finally the fault diagnosis is performed by Euclidean similarity. Also, we embed the PCA algorithm and k-NN classification algorithm into a digital signal processor. From various experiments, we found that the proposed algorithm can be used as a powerful technique to classify the several fault signals acquired from BLDC motors.

• 한국신재생에너지학회:학술대회논문집
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• 2011.11a
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• pp.90.1-90.1
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• 2011

This technology is applicable to Electrical vehicle that using Energy from Hydrogen Fueled Cell. Electricity & water is got from chemical reaction between H2 & O2 in stack. This technology is used when fault diagnosis of Fuel cell is needed. It is General method that measure each cell's voltage of stack for fault diagnosis. but, this technology is method of measuring entire voltage of stack. For this reason, fault diagnosis system is simplified and cost of system is lower than previous one. In normal stack condition, characteristic graph of voltage-current has linearity. In fault stack condition, it has non-linearity. we use this characteristic to diagnosis of stack fault. In this technology, Specific frequency current is injected into stack & Stack voltage is measured in response. After that, stack voltage difference is analyzed to diagnosis of stack fault. Presently, Development of current injection module & basic program of THDA is finished. in future we will develop the technology of precise measurement technology about entire stack voltage.

• Journal of the Korean Institute of Intelligent Systems
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• v.19 no.5
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• pp.706-712
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• 2009

In this paper, a fault diagnosis method is proposed to detect and classifies faults that occur in press process line. An oil level automatic monitoring method is also presented to detect oil level. The FFT(fast fourier transform) frequency analysis and ART2 NN(adaptive resonance theory 2 neural network) with uneven vigilance parameters are used to achieve fault diagnosis in proposing method, and GUI(graphical user interface) program for fault diagnosis and oil level automatic monitoring using LabVIEW is produced and fault diagnosis was done. The experiment results demonstrate the effectiveness of the proposed fault diagnosis method of induction motors and oil level automatic monitor system.

• Korean Journal of Health Education and Promotion
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• v.7 no.2
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• pp.22-31
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• 1990

The Purpose of this study was to define the School Health Education Concepts, to establish the learning objectives and contents for school health education, and to diagnose the phenomenal aspects related to current school health Education in Korea. The results of its diagnosis indicated that the Education Ministry had never had any open opportunities for the teachers to get health education licence, and. universities had never issued health education teacher′s licence to the perspective students in Korea. Under such condition, there was "Korean nursing teacher′s association" for school health education, which had lectures, for two to three years, in order to learn how to develop, teach and evaluate the school health program. Currently, School boards in cities recommended that all nursing teachers should teach school health education in classes for six hours in a week without any fixed health program. Also, There was only "Korean Society for Health Education" for the purpose of dealing with school health education, which had been publishing annual journal. This study demonstrated how to develop school health education curriculum, which composed of the methods for needs assessment and PRECEDE Model(Predisposing, Reinforcing, and Enabling Causes in Educational Diagnosis and Evaluation).

• Korean Journal of Poultry Science
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• v.19 no.2
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• pp.65-76
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• 1992

Since the first outbreaks of Newcastle disease ( ND) in Korea was reported in 1927, the disease has been a major problem in Korean poultry industry. Several attempts related ND prevention and controls have been tried and significantly reduced the ND outbreaks. However, recently frequencies of ND outbreaks have been increased throughout the country since 1988. Many assumptions such as variances of ND virus pathogenicity, decreased efficacy of ND vaccine, incorrect vaccination program etc, has been issued and discussed. Therefore, to clearly understand this recent situation of ND outbreaks in Korea, we reviewed all available past informations related with ND outbreaks in Korea and compared the virulence of recently isolated ND viruses with that of a reference one. Also, we discussed about some problems related with serological diagnosis. administration methods of vaccine and vaccination program.