Hancheng Liao

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A new image retrieval method was introduced based on the combination of CBIR (content-based image retrieval) and MD5, after a brief introduction to current status of image retrieval technology. Kernel thought was that MD5 value was extracted from an image file and then indexed. These indexed MD5 values were used for image retrieval. Implementation of the(More)
Revenue of traditional software enterprises are from software copyright licensing and software upgrades, maintenance and other services fees. As a rapidly growing operation model of software contrast to traditional perpetual-use license, SaaS (Software as a Service) softwares are subscripted by users from vendors. From views of business and technique,(More)
  • Hancheng Liao
  • 2009 International Conference on New Trends in…
  • 2009
As rapidly growing software licensing mode contrast to traditional perpetual-use license mode, SaaS users could use any software which they need through subscriptions from software vendors. By means of comparative analysis method, a mould software architecture based on SaaS is proposed after a brief introduction on both ASP concept and a typical ASP(More)
In this paper, the integration of large-area-synchronized code division multiple access (LAS-CDMA) technology and multicarrier technology is studied. Single cell LAS-CDMA system takes LS codes as its spread spectrum code which have good correlation property, so that the inter-symbol interference (ISI) and multiple access interference (MAI) can be eliminated(More)
Large area synchronized code division multiple access (LAS-CDMA) technology is an excellent CDMA technology an can be applied in the future mobile communication systems. If the multiple input multiple output (MIMO) technique is integrated into LAS-CDMA system, better performance can be obtained. For example, in such MIMO-LAS-CDMA system, many antennas are(More)
  • Hancheng Liao
  • 2008 4th International Conference on Wireless…
  • 2008
Loosely-synchronized code division multiple access (LS-CDMA) technology is an excellent CDMA technology and very suitable to be applied in the future wireless communication systems. When the multiple input multiple output (MIMO) technique is integrated, better performance and system capacity can be achieved. But the computational complexity of classical(More)
In order to further decrease the detection complexity, a joint detection method based on both zero forcing and sphere decoding is proposed. When the signal-to-noise ratio is high enough, such detector results in zero forcing detection, otherwise it subtracts the decoded signals from the receiving signal and then decodes them by sphere decoding algorithm. In(More)
Requirements elicitation and analysis is intended to gain knowledge about users' requirements and the information system environment. Requirement analysts should understand the application domain, demands, and constraints of the project clearly in order to make realistic software size and effort estimates, and to have a solid foundation for defining(More)
  • Hancheng Liao
  • 2009 5th International Conference on Wireless…
  • 2009
Multicode system is designed to get more spreading sequences and get higher multiplexing capacity in large-areasynchronized code division multiple access (LAS-CDMA) system. The computational complexity is too high for the optimum detection algorithm using maximum-likelihood (ML) rule and the genetic algorithm (GA) method is often applied to get the(More)
By integrating space-time coding technology into LAS spread spectrum technology, the code division multiple access system can take both of their advantage. When many antennas are installed on the base station, the wireless communication system is possible to get full spatial diversity gain. Both the transmitter scheme and the receiver scheme of such(More)