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김주형 대한건축학회 2006 大韓建築學會論文集 : 構造系 Vol.22 No.4
The normative models guiding the purposeful activities of the building industry client have been presented. In particular, more attention needs to be paid to clients at the pre-project stage because in general, occasional clients show a lack of knowledge at this stage. To counteract the lack of knowledge, theories and practices of knowledge management (KM) can provide a logical means to support them. The reviews of knowledge theory and KM suggest that knowledge should be approached as streams (or flows), rather than assets to manage; people-bound aspects, such as attitude and behaviour, should be considered with system-bound aspects. Given that necessary knowledge for clients also flows at the societal level, in order to sustain the knowledge streams for them, two approaches to cultivate context are suggested: Market-approached context, where the service providers maintain knowledge for marketing and network-approached context, where the clients provide knowledge for maintaining reference power. This paper presents a scheme to facilitate knowledge streams of clients based on these two concepts. In order to validate the feasibility of scheme and to clarify the limits, a prototype of information systems that are enabling sustainable knowledge streams are implemented for a specific group of clients, housing cooperatives in urban renewal areas, Busan.
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김주형,송정빈,정영훈,이영진,백종후,김우석,이해근 대한금속·재료학회 2010 METALS AND MATERIALS International Vol.16 No.1
An acoustic emission (AE) technique was introduced as a non-destructive method to monitor sudden deformation caused by local heat concentrations and micro-cracks within superconductors and superconducting magnets. However, the detection of AE signals in a high temperature superconductor (HTS) tape is not easy because of its low signal to noise ratio caused by the noise from boiling liquid cryogen or mechanical vibration from the cryo-cooler. Therefore, high performance piezoelectric ceramics are needed to improve the sensitivity of the AE sensor. The aim of this study was to improve the piezoelectric and dielectric properties to enhance the performance of an AE sensor. This study examined the effects of Nb2O5 addition (0.0 wt.% to 2.0 wt.%)on the properties of high performance piezoelectric ceramics, Pb(Zr0.54 Ti0.46)O3 + 0.2 wt.% Cr2O3, sintered at 1200 ºC for 2 h. The performance was examined with respect to the acoustic emission response of AE sensors manufactured using the specimens with various Nb2O5 contents. Superior sensor performance was obtained for the AE sensors fabricated with the specimens containing 1.0 wt.% to 1.5 wt.% Nb2O5. The performance and characteristics of the AE sensors were in accordance with their piezoelectric and dielectric properties.
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