Browsing by Author "Shih, HY"

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Anomalous absorption of resonance-type periodic structures
(2000)
Peng, ST
;
Hwang, RB
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Shih, HY
;
交大名義發表
;
National Chiao Tung University
We present here a study on scattering characteristics of resonance-type periodic structures, taking into account the effects of structure dispersion and material loss. The phenomena of anomalous absorption are systematically investigated on the basis of the guiding characteristics of the structures. In particular, the effect of dispersion is carefully examined.
Comparing patterns of intersectoral innovation diffusion in Taiwan and China: A network analysis
(2005-02-01)
Chang, PL
;
Shih, HY
;
經營管理研究所
;
Institute of Business and Management
This paper presents a quantitative method for comparing the structure and performance of intersectoral innovation diffusion in the Taiwanese and Chinese innovation systems. The network of intersectoral innovation diffusion is constructed and proxied by the product-embodied R&D flow matrices calculated by the use of data on input-output tables and sectoral R&D expenditure. The two networks are structurally compared with the help of methodologies derived from the network analysis, which are conducted at the national, cluster and individual levels to thoroughly examine the multi-embededness of the sectors situated in a technological diffusion network. This study shows that the two systems have similar distributions of key sectors, including the cores, i.e. machinery and equipment, electronic parts and components, and the sources, i.e. chemicals and basic metals, of innovation flows. However, significant differences also exist. For example. the Taiwanese system is characterized by higher degrees of systemic connection and hierarchy, while the Chinese system has looser density and less centralization. Additionally, the Taiwanese system appears capable of more efficient innovation diffusion among vertically related industries than the Chinese system due to the former containing more effective clusters. Finally, China's technological concentration is centered on heavy industry, while Taiwan is focused on high-tech industry. (C) 2003 Elsevier Ltd. All rights reserved.
The innovation systems of Taiwan and China: a comparative analysis
(2004-07-01)
Chang, PL
;
Shih, HY
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經營管理研究所
;
Institute of Business and Management
This paper presents an analytical framework to compare two distinguishing innovation systems. For recognizing the structural characteristics of innovation systems, six major functions of generic types of institutions involved in the systems are examined: policy formulation, performing R&D, financing R&D, promotion of human resource development, technology bridging, and promotion of technological entrepreneurship. Not only does it describe the role and performance of particular institutions, but this framework also explores four major interactions among these institutions for illustrating the dynamics and efficiency of innovation systems, that is, R&D collaboration, informal interaction, technology diffusion, and personnel mobility. The framework is applied to compare the innovation systems of Taiwan and China, revealing that they both have unique characteristics, while also sharing numerous complementary features. In addition, the two economies have the linguistic, cultural, racial and historical similarities, plus their geographical proximity. Consequently, these phenomena suggest the possibility of future cooperation between the two innovation systems, and then this paper proposes possible approaches to achieving cooperation for the two sides. (C) 2002 Elsevier Ltd. All rights reserved.
The performance of GPS Standard Positioning Service without selective availability
(2001-07-01)
Shih, TY
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Shih, HY
;
Yang, M
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土木工程學系
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Department of Civil Engineering
The accuracy of the Standard Positioning Service of GPS has greatly improved after the termination of Selective Availability. Based on GPS observations from permanent GPS-fixed stations, the actual accuracy of GPS without SA is analyzed. For Station NCTU, the local geodetic coordinates are computed with the C/A code pseudo-ranges, and then transformed into a local grid system with Trans-Mercator projection. From 77984 single epoch observations collected in twenty-nine days, the 95% accuracy is found to be DeltaE : 17.6544m, DeltaN : 11.8236, DeltaH : 31.8018m. For five selected UNAVCO stations, the axes of error ellipsoid are computed.