Search | Korea Science

노대석;이현옥;오성철;최재석;차준민;김재언
- The Transactions of the Korean Institute of Electrical Engineers A
- /
- v.52 no.2
- /
- pp.90-98
- /
- 2003
Recently, the increasing application of electronic equipments and information devices has heightened the interest in power qualify. The term power quality is applied to a wide range of electromagnetic phenomena on the power system and is also concentrated by all areas such as utilities, their customers and suppliers of load equipments. In engineering terms, power Qualify is expressed by voltage qualify because the power supply system can only control the quality of the voltage. Therefore, the standards in power quality area are devoted to keep the supply voltage within allowable limits. This paper deals with single-phase unified power quality conditioner (UPQC), which ai s at the integration of series-active and shunt-active filter. The series filter il used to compensate for the voltage distortions and the shunt filter is used to provide reactive power and counteract the harmonic current injected by the load. Also, the voltage of the DC link capacitor is controlled to a desired value by the shunt active filter. The validity of the proposed UPQC is demonstrated using both the MATLAB/SIMULINK simulation and the experimental device with DSP (TMS320C32).
PDF KSCI

Yeom, Gwy-Duk;Min, Dug-Ki
- Journal of the Korea Society of Computer and Information
- /
- v.10 no.4 s.36
- /
- pp.337-344
- /
- 2005
UDDI server is the web services registry enabling users to register and search for web services. However, the existing UDDI servers do not provide any information about web services qualify. We designed and developed a UDDI broker system which actively monitors and analyses the qualify of web services. The analysis results are presented to users in statistical figures and graphs. With this information a user can select a web service that meets his/her needs. Availability, performance, and stability were the metrics used for the service qualify measurement and analysis.
PDF

Hwang, Jae-Young;Lee, Eung-Bong;Kim, Jong-Hwan
- Journal of the Korean Society for Library and Information Science
- /
- v.41 no.3
- /
- pp.55-79
- /
- 2007
In this study the need for new service qualify assessment scale is investigated to cope with the paradigm change in library information service and the dimension and model for e-service quality assessment applicable to a digital library are developed. In order to verify newly proposed dimension and model for e-service qualify assessment, the dimension which is developed by employing data collected from NDSL(National Digital Science Library) and its factor are analyzed and casuality analysis between independent and dependent variables is executed based on the proposed e-service qualify model We also analyze the gap between customer's ideal expectation and perception and, finally investigate what is the most important dimension among e-service quality in the digital library from the customer's point of view.
https://doi.org/10.4275/KSLIS.2007.41.3.055 인용 PDF