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( Shu-ming Tseng ),( Li-hsin Chiang ),( Yung-chung Wang ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.12
Previous papers analyzed the throughput performance of the CDMA ALOHA system in Rayleigh fading channel, but they assume that the channel coefficient of Rayleigh fading was the same in the whole packet, which is not realistic. We recently proposed the finite-state Markov channel (FSMC) model to the throughput analysis of DS uncoded CDMA/unslotted ALOHA networks for fixed length data traffic in the mobile environment. We now propose the FSMC model to the throughput analysis of coded DS CDMA/unslotted ALOHA networks with variable length data traffic and one or two user classes in the mobile environment. The proposed DS CDMA/unslotted ALOHA wireless networks for two user classes with access control can maintain maximum throughput for the high priority user class under high message arrival per packet duration.
( Shu-ming Tseng ),( Shih-han Wang ) 한국인터넷정보학회 2013 KSII Transactions on Internet and Information Syst Vol.7 No.10
In this paper, we extend the case of information exchange error mitigation for the distributed orthogonal space-time block code (DOSTBC) for two transmit antennas to distributed quasi-orthogonal space-time block code (DQOSTBC) for four transmit antennas. A rate 1 full-diversity DQOSTBC for four transmit antennas is designed. The code matrix changes according to different information exchange error cases, so full diversity is maintained even if not all information exchange is correct. We also perform analysis of the pairwise error probability. The performance analysis indicates that the proposed rate 1 DQOSTBC outperforms rate 1/2 DOSTBC for four transmit antennas at the same transmission rate, which is confirmed by the simulation results.
GPU-Accelerated Single Image Depth Estimation with Color-Filtered Aperture
( Yueh-teng Hsu ),( Chun-chieh Chen ),( Shu-ming Tseng ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.3
There are two major ways to implement depth estimation, multiple image depth estimation and single image depth estimation, respectively. The former has a high hardware cost because it uses multiple cameras but it has a simple software algorithm. Conversely, the latter has a low hardware cost but the software algorithm is complex. One of the recent trends in this field is to make a system compact, or even portable, and to simplify the optical elements to be attached to the conventional camera. In this paper, we present an implementation of depth estimation with a single image using a graphics processing unit (GPU) in a desktop PC, and achieve real-time application via our evolutional algorithm and parallel processing technique, employing a compute shader. The methods greatly accelerate the compute-intensive implementation of depth estimation with a single view image from 0.003 frames per second (fps) (implemented in MATLAB) to 53 fps, which is almost twice the real-time standard of 30 fps. In the previous literature, to the best of our knowledge, no paper discusses the optimization of depth estimation using a single image, and the frame rate of our final result is better than that of previous studies using multiple images, whose frame rate is about 20fps.
Yan-Fu Lin,Jiann-Rong Chen,Jo-Ming Tseng,Shu-Yu S. Wang,Chi-Min Shu 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.3
Methyl ethyl ketone peroxide (MEKPO) is an unstable material that is classified as an explosive substance. We evaluated MEKPO 10 mass% under mixing with three inorganic acids (6 N HNO3, 6 N H3PO4, and 6 N H2SO4) by adiabatic system of vent sizing package 2 (VSP2). Results from evaluation and testing indicated that these three inorganic acids could increase the degree of hazard while combined with pure MEKPO. Therefore, information on the hazards and phenomena of runaway reaction should be provided in order to lessen the degree of hazard.