• The Transactions of The Korean Institute of Electrical Engineers
• /
• v.65 no.9
• /
• pp.1564-1570
• /
• 2016

This study proposes a newly modified form of existing ground electrodes in order to secure trust of grounding system for large current caused by a stroke of lightning. Proposed planar earth structure has a several needle electrodes around a circular rod and 4 plane electrodes in all directions. The plane electrodes are fused with the insulator on the linear rod, so that they're electrically isolated. The concept is to increase the discharge amount of earth structure using multiple discharge paths like needle and plane electrodes. To check the discharge efficiency of the suggested scheme, the discharge currents are compared with typically used two kinds of ground rods. To ensure accuracy in the measurement of the discharge current, the same material was used for the comparison model. Also, the ground resistance are simulated by CDEGS commercial software and the results are compared with measured data. Based on this kind of experimental study, the suggested ground rod can be used when designing a ground system or when constructing a ground system at the site.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2002.11b
• /
• pp.875-880
• /
• 2002

It is necessary to determine the vibration source and its transmission paths in order to develop a low-noise compressor. Through the use of multiple-input/single-output(MISO) mode1, the transmission paths of vibration within a reciprocating compressor have been investigated. In order to identify the transmission path, we measure the accelerations of the block and transverse vibrations of the line discharge tube. As outputs, vibrations of compressor shell were measured at three positions; cylinder head, one near the suction line, and the top of upper shell. The partial coherence function and transfer function are obtained ken the measured data, and the results are observed in order to determine vibration source and its influence on the shell vibration.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2002.11a
• /
• pp.386.1-386
• /
• 2002

It is necessary to determine the vibration source and its transmission paths in order to develop a low-noise compressor Through the use of multiple-input/single-output(MISO) model, the transmission paths of vibration within a reciprocating compressor have been investigated. In order to identify the transmission path, we measure the accelerations of the block and transverse vibrations of the line discharge tube. (omitted)

• Quality Improvement in Health Care
• /
• v.4 no.1
• /
• pp.104-114
• /
• 1997

Background : Hospitals(Health care providers) are under tremendous pressure to meet consumer demands in order to compete in the rapidly changing health care arena. Through evaluating patient satisfaction, hospitals(health care providers) can learn what the consumer Wants from the health care system. Timely feedback is necessary. The purpose of this study is to evaluate patients' hospital experience and satisfaction using telephone interview and to study the usefulness for telephone interview at assessing patient satisfaction. Method : The 846 patients who were discharged from September 17, 1996 to October 11, 1996 were targeted were telephoned. The informations gathered telephone survey were processed by computer and analyzed for the patient satisfaction, contributing factors. Result : The 846 patients who were discharged from September 17, 1996 to October 11, 1996 were called and 197 patients(23.3%) were successful interviewed. 51.3 percent of respondents were male and mean age is 39 years mean LOS(length of stay) is 13 days and 110(56.1%) patients were admitted by outpatients clinic. The mean calling-time is 5.5 minutes. There is no significant difference between interviewers(telemarketer) in patients satisfaction. Seven telephone interviews are possible by interview a day. There in no significant difference between groups in patients satisfaction in length of stay, path of admission, the interval between discharge and interview. 97.5 percent of respondents were satisfied with telephone interview and 81.7% were satisfied with overall satisfaction and 79.4 % of respondents were good response in interviewers' conclusion. Of six variables that were found to be correlated with telephone interview and eight variables correlated with overall hospital satisfaction, a multiple logistic regression analysis revealed that two most important variables which are significantly correlated with telephone interview are to meet doctors, not ask tediously then three variables which are with overall satisfaction are doctors explain, subject response, convenient facilities. Conclusion : The patients interviewed are satisfied with telephone interview. Telephone interview is good method for assessing patient satisfaction, making high levels of patient satisfaction and for hospital marketing.