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RISS 인기검색어
- 검색키워드
- 저자 : Peng-Yong Kong (검색결과 6 건)
- 무료
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- 유료
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Power-Optimized Vertical Handover Scheme for Heterogeneous Wireless Networks
Yujae Song,Peng-Yong Kong,Youngnam Han IEEE 2014 IEEE communications letters Vol.18 No.2
<P>This letter proposes a vertical handover scheme to minimize the total power consumption required in serving a traffic flow, while guaranteeing a particular service rate of different access networks. The proposed scheme is based on a Markov decision process (MDP) that uniquely captures the power consumption during the vertical handover execution as well as the transmission power and circuit power. Our scheme is capable of handling stochastic system behaviors while finding an optimal decision policy. Simulation results show that the proposed scheme can lead to a lower total power consumption compared to several existing schemes. For a special case where each traffic flow has a fixed number of frames, our results suggest that the number of decision epochs can be reduced to further conserve power.</P>
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Minimizing Energy Consumption Through Traffic Offloading in HetNets With Two-Class Traffic
Yujae Song,Peng-Yong Kong,Youngnam Han IEEE 2015 IEEE communications letters Vol.19 No.8
<P>In this letter, we propose a traffic offloading method to minimize the energy consumption of two-tier heterogeneous networks that support two classes of packets with different delay requirements. We derive a scheme to determine the optimal base station (BS) association biases that minimize the packet delays given an energy consumption. By employing the scheme iteratively, we can determine the minimum network energy consumption required in satisfying simultaneously different delay requirements of two packet classes. Numerical results confirm that, by means of optimal BS association biases, the desired packet delays can be achieved with a lower network energy consumption when compared with the case of not controlling BS association biases. This result arrives at a conclusion that traffic offloading with optimal BS association biases can lead to network energy saving.</P>
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Performance Study on ZigBee-Based Wireless Personal Area Networks for Real-Time Health Monitoring
Bernard Kai,Peng-Yong Kong 한국전자통신연구원 2006 ETRI Journal Vol.28 No.4
When multiple ZigBee wireless personal area networks (WPANs) are in close proximity to each other, contentions and collisions in transmissions will lead to increased packet delays. However, there is no existing study on how delay performance would be affected in a crowded reallife environment where each person walking down a busy street would be wearing a ZigBee WPAN. This letter studies the use of ZigBee WPANs in such a real-life environment for real-time heart beat monitoring. To be pragmatic, we derived a mobility pattern from the analysis of a real-life video trace. Then, we estimated the delay performance from the video trace by combining data collected from ZigBee experiments. The results show that the 300 ms packet delay requirement will not be met for only 11% of the time. When failure occurs, it will last for an average duration of 1.4 s.
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Metabolic Engineering of Probiotic <i>Saccharomyces boulardii</i>
Liu, Jing-Jing,Kong, In Iok,Zhang, Guo-Chang,Jayakody, Lahiru N.,Kim, Heejin,Xia, Peng-Fei,Kwak, Suryang,Sung, Bong Hyun,Sohn, Jung-Hoon,Walukiewicz, Hanna E.,Rao, Christopher V.,Jin, Yong-Su American Society for Microbiology 2016 Applied and environmental microbiology Vol.82 No.8
<P>Saccharomyces boulardii is a probiotic yeast that has been used for promoting gut health as well as preventing diarrheal diseases. This yeast not only exhibits beneficial phenotypes for gut health but also can stay longer in the gut than Saccharomyces cerevisiae. Therefore, S. boulardii is an attractive host for metabolic engineering to produce biomolecules of interest in the gut. However, the lack of auxotrophic strains with defined genetic backgrounds has hampered the use of this strain for metabolic engineering. Here, we report the development of well-defined auxotrophic mutants (leu2, ura3, his3, and trp1) through clustered regularly interspaced short palindromic repeat (CRISPR)-Cas9-based genome editing. The resulting auxotrophic mutants can be used as a host for introducing various genetic perturbations, such as overexpression or deletion of a target gene, using existing genetic tools for S. cerevisiae. We demonstrated the overexpression of a heterologous gene (lacZ), the correct localization of a target protein (red fluorescent protein) into mitochondria by using a protein localization signal, and the introduction of a heterologous metabolic pathway (xylose-assimilating pathway) in the genome of S. boulardii. We further demonstrated that human lysozyme, which is beneficial for human gut health, could be secreted by S. boulardii. Our results suggest that more sophisticated genetic perturbations to improve S. boulardii can be performed without using a drug resistance marker, which is a prerequisite for in vivo applications using engineered S. boulardii.</P>
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Research on Damage Identification of Buried Pipeline Based on Fiber Optic Vibration Signal
Weihong Lin,Wei Peng,Yong Kong,Zimin Shen,Yuzhou Du,Leihong Zhang,Dawei Zhang 한국광학회 2023 Current Optics and Photonics Vol.7 No.5
Pipelines play an important role in urban water supply and drainage, oil and gas transmission, etc. This paper presents a technique for pattern recognition of fiber optic vibration signals collected by a distributed vibration sensing (DVS) system using a deep learning residual network (ResNet). The optical fiber is laid on the pipeline, and the signal is collected by the DVS system and converted into a 64 × 64 single-channel grayscale image. The grayscale image is input into the ResNet to extract features, and finally the K-nearest-neighbors (KNN) algorithm is used to achieve the classification and recognition of pipeline damage.
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Variation of Urinary and Serum Trace Elements (Ca, Zn, Cu, Se) in Bladder Carcinoma in China
Guo, Kun-Feng,Zhang, Zhe,Wang, Jun-Yong,Gao, Sheng-Lin,Liu, Jiao,Zhan, Bo,Chen, Zhi-Peng,Kong, Chui-Ze Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.5
Backgrounds: Deficiency or excess of trace elements can induce body metabolic disorders and cellular growth disturbance, even mutation and cancerization. Since there are few studies of the effect of trace elements in bladder carcinoma in China, the aim of this study was thus to assess variation using a case control approach. Methods: To determine this, 81 patients with bladder carcinoma chosen as a study group and 130 healthy persons chosen as a control group were all assayed for urinary and serum trace elements (calcium [Ca], zinc [Zn], copper [Cu], selenium [Se]) using an atomic absorption spectrophotometer, and the results were analyzed by independent sample t tests. The correlative factors on questionnaires answered by all persons were analyzed by logistic regression. Results: The results showed urinary Ca, Zn and serum Cu levels of the study group to be significantly higher (P<0.05) than those of he control group. Serum Ca and Se levels of study group were significantly lower (P<0.05) than those of control group. Conclusion: There were higher urinary Zn and serum Cu concentrations in bladder carcinoma cases. Bladder carcinoma may be associated with Ca metabolic disorder, leading to higher urinary Ca and lower serum Ca. Low serum Se and smoking appear to be other risk factors for bladder carcinoma in China.
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