• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2008년도 하계학술발표대회 논문집
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• pp.103-108
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• 2008

Automatic control makes the air-handling unit go into operation and determines the functions of high-efficient and energy-saving machines. Yamatake, an automatic control system manufacturer, have expanded fault detection and diagnosis, and data volumes so as to achieve higher technology in control by developing a sensor which makes field data visible, an actuator and Intelligent Conponent. This study, thus, focuses on applications for saving energy with Intelligent Conponent and goes in for easing global warming by creating future field data-based applications.

• 정보처리학회논문지B
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• 제10B권2호
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• pp.197-204
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• 2003

현재까지 개발된 의료진단 시스템들은 인체 특정 질환을 염두에 두고 구체적 조건의 조합에 의존하여 진단 범주를 설정하는데 통상적으로 특정 장기에 제한되어 있어서 여러 가지 유형의 질환에 공통적으로 나타나는 중상을 진단하는 경우 조기에 정확한 진단을 내리기가 힘든 문제점을 지니고 있다. 급성복통(acute abdominal pain)은 전구 증상 없이 갑자기 복통이 발생하는 것으로 소화기 질환을 비롯한 여러 질환에서 환자들이 공통적으로 가장 흔하게 호소하는 증상으로 연관된 질환이 다양하여 의사들이 적절한 감별진단을 내리기가 쉽지 않다. 본 연구에서는 급성 복통과 연관된 질환의 감별진단 시스템으로서 기존의 DS-DAAP의 성능을 개선한 퍼지관계곱에 기반한 지능형 질환 진단시스템(IDS-DAAP)을 제안한다. 제안하는 시스템은 기존의 DS-DAAP와 비교해 볼 때 진단의 정확성을 높이면서 수행시간을 감소시켰다.

• 한국지능시스템학회논문지
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• 제7권1호
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• pp.45-53
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• 1997

This paper presents hybrid expert system for diagnosis of electric power transformer faults. The expert system diagnose and detect faults in oil-filled power transformers based on dissolved gas analysis. As the preprocessing stage, fuzzy information theory is used to manage the uncertainty in transformer fault diagnosis using dissolved gas analysis. The Kohonen neural network takes the interim results by applying fuzzy informations theory as inputs, and performs the transformer fault diagnosis. The Proposed system tested gas records of power transformers from Korea Electric Power Corporation to verify the diagnosis performance of transformer faults.

• 정보처리학회논문지B
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• 제11B권7호
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• pp.855-860
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• 2004

본 논문에서는 급성복통과 관련된 지능형 질환 진단시스템에서 지식베이스의 최적화에 대해서 논한다. 급성복통과 관련된 지능형 질환 진단시스템의 지식베이스는 퍼지 규칙과 퍼지 멤버쉽 함수들로 구성되는데, 본 연구에서는 효율적으로 퍼지 규칙을 생성하는 알고리즘을 적용한 개선된 급성복통과 관련된 지능형 질환 진단 시스템(A-lDS-DAAP)을 제안한다. 제안하는 시스템은 기존의 IDS-DAAP, IDS-DAAP-NN과 비교해 볼 때, 진단의 정확성을 높이면서 수행속도를 향상시켰다.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 1997년도 Proceedings International Workshop on New Video Media Technology
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• pp.61-66
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• 1997

For constructing an intelligent multimedia database system for medical diagnosis, we are focusing on two technological points. One is a retrieval algorithm of databases, and the other is a coding algorithm of multimedia contents. For the first, previously we proposed a front-end database preprocessor called“keyword-network”, and in this paper we present its extended model providing an intelligent logical AND searching function especially for medical differential diagnosis. For the second, we present examples of multimedia intellectual coding methods for cardiovascular examination records.

• International Journal of Fuzzy Logic and Intelligent Systems
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• 제7권4호
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• pp.279-284
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• 2007

Nowadays, due to development of automatic control devices and various sensors, one operator can freely handle several remote plants and processes. Automatic diagnosis and warning systems have been adopted in various fields, in order to prepare an operator's absence for patrolling plants. In this paper, a Bayesian networks based on-line diagnosis system is proposed for a wastewater treatment process. Especially, the suggested system is included learning structure, which can continuosly update conditional probabilities in the networks. To evaluate performance of proposed model, we made a lab-scale five-stage step-feed enhanced biological phosphorous removal process plant and applied on-line diagnosis system to this plant in the summer.

• 한국컴퓨터정보학회논문지
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• 제19권12호
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• pp.11-19
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• 2014

본 논문에서는 데이터마이닝모듈과 정보융합모듈을 핵심구성요소로 가지는 지능형에이전트 시스템을 설계하고 다각도 정보를 융합하여 진단전문가시스템으로 활용할 수 있는 가능성을 제시한다. 데이터마이닝모듈에서는 퍼지신경망 OFUN-NET에 의하여 다각도의 데이터를 분석하고 퍼지 클러스터 정보를 지식베이스로 구축한다. 정보융합모듈과 응용모듈에서는 가능성정도로 제공되는 진단결과와 불확실 결정상태나 비대칭의 발견과 같은 전문가의 진단에 유용한 정보를 제공해 주고 있다. 또한 DDSM 벤치마크 데이터베이스로부터 획득한 디지털 유방 x선 영상의 BI-RADS 기반 특징데이터를 가지고 실험한 결과는 기존의 방법보다 높은 분류 정확도를 보여주면서 컴퓨터보조진단시스템으로서의 가능성을 보여주고 있다.

• Journal of information and communication convergence engineering
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• 제15권2호
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• pp.85-90
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• 2017

Expert systems for health diagnosis are only for medical experts who have deep knowledge in the field but we need a self-checking pre-diagnosis system for preventive public health monitoring. Korea Traditional Medicine is popular in use among Korean public but there exist few available health information systems on the internet. A computerized self-checking diagnosis system is proposed to reduce the social cost by monitoring health status with simple symptom checking procedures especially for Korea Traditional Medicine users. Based on the national reports for disease/symptoms of Korea Traditional Medicine, we build a reliable database and devise an intelligent inference engine using fuzzy c-means clustering. The implemented system gives five most probable diseases a user might have with respect to symptoms given by the user. Inference results are verified by Korea Traditional Medicine doctors as sufficiently accurate and easy to use.

• International Journal of Fuzzy Logic and Intelligent Systems
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• 제2권1호
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• pp.33-37
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• 2002

Insulation aging diagnosis system provides early warning regarding electrical equipment defects. Early warning is very important in that it can avoid great losses resulting from unexpected shutdown of the production line. Since relations of insulation aging and partial discharge dynamics are non-linear. it is very difficult to provide early warning in an electrical equipment. In this paper, we propose the design method of insulation aging diagnosis system that use a electromagnetic wave and acoustic signal to diagnose an electrical equipment. Proposed system measures the partial discharge on-line from DAS(Data Acquisition System and acquires 2D patterns from analyzing it. For filtering the noise contained in sensor signals we used ICA algorithms. Using this data, we design of the neuro-fuzzy model that diagnoses an electrical equipment and is investigated in this paper. Validity of the new method is asserted by numerical simulation.

• International Journal of Fuzzy Logic and Intelligent Systems
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• 제16권3호
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• pp.173-180
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• 2016

Fault detection and diagnosis is a task to monitor the occurrence of faults and pinpoint the exact location of faults in the system. Fault detection and diagnosis is gaining importance in development of efficient, advanced and safe industrial systems. Three phase inverter is one of the most common and excessively used power electronic system in industries. A fault diagnosis system is essential for safe and efficient usage of these inverters. This paper presents a fault detection technique and fault classification algorithm. A new feature extraction approach is proposed by using three-phase load current in three-dimensional space and neural network is used to diagnose the fault. Neural network is responsible of pinpointing the fault location. Proposed method and experiment results are presented in detail.