5,287 research outputs found

    DEVELOPMENT STRATEGIES OF AN EXPERT SYSTEM FOR MULTIPLE ALARM PROCESSING AND DIAGNOSIS IN NUCLEAR-POWER-PLANTS

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    This paper describes the development strategies of a prototype expert system, called ESAPD, for multiple alarm processing and diagnosis in nuclear power plants. The main objectives of the system are to assist operators to identify a primary causal alarm among multiple fired alarms and to diagnose the plant malfunction quickly. The overall plant-wide diagnosis is performed at the alarm processing stage which can identify a primary causal alarm and can diagnose possible failure modes and failed systems, and automatic interlock actions. The knowledge base for the alarm processing is represented as object-oriented concepts. The specific root cause diagnosis for the primary causal alarm can be performed at the alarm diagnosis stage. The system can provide operators with the possible causes of the primary causal alarm, emergency actions, and follow-up treatments. The diagnostic method adopted in this system is a ''hypothesize and test'' paradigm

    NEGATIVELY CHARGED STATE OF ATOMIC-HYDROGEN IN N-TYPE GAAS

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    It is demonstrated that atomic hydrogen drifts as a negatively charged state in n-type GaAs and the high electric field strongly affects the dissociation of the hydrogen-donor complex. During reverse-bias-anneal experiments on the Schottky diode, it is confirmed that a negatively charged hydrogen atom is accelerated out of the high-field region and that there is a dissociation-frequency region independent of the anneal temperature. In the dissociation-frequency region dependent on the anneal temperature, the first-order kinetics gives rise to the dissociation energy for the release of the hydrogen-Si donor complex. The dissociation energies are dependent on the applied bias voltage and are in the range of 1.79 to 1.2 eV. Atomic hydrogen in plasma-hydrogenated Si-doped n-type GaAs is proposed to be negatively charged with the gain of free electrons and passivates the Si donor, and also the hydrogen or the electron of the hydrogen-Si donor complex to be easily released by the electric field.

    Factor Structure and Reliability of the Posttraumatic Cognitions Inventory in Korean Female Victims of Sexual Violence

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    Trauma-related cognitions play an important role in formation and persistence of posttraumatic stress symptoms. This study investigated the psychometric properties of the Korean version of the Posttraumatic Cognitions Inventory (PTCI) in a sample of 227 females who had experienced sexual violence. Data were collected from victims who sought victim support services following sexual violence between 2011 and 2015. The Impact of Event Scale-Revised, Beck Depression Inventory, and Beck Anxiety Inventory were used to measure posttraumatic stress disorder severity, depression, and anxiety, respectively. The three-factor solution of the PTCI (SELF, WORLD, BLAME) was supported; however, it was necessary to remove five items from the original 33-item scale. The 28-item PTCI displays good internal consistency, concurrent validity, and discriminant validity. SELF and WORLD subscales correlated with trauma symptom severity, controlling depression and anxiety. This is the first study to investigate factor structure and psychometric properties of the Korean version of the PTCI with female victims of sexual violence, which demonstrated that 28-item version of PTCI is an acceptable assessment measure of examining trauma-related cognitions
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