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Tao Shen,Soo Park,석창성 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.5
The geometry of cracked pipe, loading condition and crack size all can have a strong effect on its resistance against crack-tip plastic deformation and crack growth. Usually, specimens listed in test standards (e.g. CT specimen) are applied to evaluate the fracture resistance (J-R) curves, which may cause excessive safety margin in leak-before-break (LBB) design of nuclear pipes. In this study, standard (CT) specimen and constraint designed specimens, including curved CT and compact pipe (CP) specimens were applied to measure the J-R curves of nuclear pipes. Finite element analysis (FEA) was applied to derive Jequations to calculate J-R curves for newly designed specimens. Constraint effects in these specimens and full-scale pipes under various loading conditions were compared according to crack-tip plastic deformation level. Then, safety margins in LBB design using these specimens were quantitatively analyzed by constructing the critical crack length lines. Both the tests and FEA results verified the validity of these constraint designed specimens for reducing conservatism.
Tao Shen,Wei Li,Yan-Yan Wang,Qing-Qing Zhong,Shu-Qi Wang,Xiao-Ning Wang,Dong-Mei Ren,Hongxiang Lou 대한약학회 2014 Archives of Pharmacal Research Vol.37 No.3
In our cell based screening of antitumoringredients from plants, the EtOH extract of Garciniabracteata displayed antiproliferative effect against humanlung adenocarcinoma A549 cells, human breast cancerMCF-7 cells, and human prostate cancer PC3 cells. Phytochemicalinvestigation of this active extract producednine ingredients, and their structures were established byanalysis of MS and NMR spectra. Antiproliferative evaluationof isolated ingredients on A549, MCF-7 and PC3cells indicated that a xanthone named isobractatin (1)exhibited potent antiproliferative activity against the abovethree human cancer cell lines with IC50 values rangingfrom 2.90 to 4.15 lM. Treatment of PC3 cells with 1 led toan enhancement of the cell apoptosis, and arrested cellcycle in the G0/G1 phase. The G0/G1 phase cycle-relatedproteins analysis showed that the expressions of cyclins D1and E were reduced by 1, whereas the protein level of cyclin dependent kinase (CDK) inhibitor P21 was induced. Additionally, 1 enhanced PC3 cell apoptosis by activationsof Bax, caspases 3 and 9, and by inhibition of Bcl-2. Ourcombined data illustrated that isobractatin (1) was theantiproliferative ingredient of G. bracteata against threehuman cancer cell lines, which exerted its antiproliferatriveeffect via cell cycle arrest and induction of apoptosis.
Taoshen Li,Chengxin Guo,Zhihui Ge 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.9
In order to improve serious signal interference and energy consumption of wire mesh backbone network due to omni-directional antenna communication mechanism, a topology control optimization algorithm in wireless mesh backbone networks based on directional antenna is proposed. At first, this algorithm used Delaunay graph model to quickly find gateway node by position information of network nodes. Then, in view of the relationship between network transmission distance and the node degrees, it optimizes the network topology structure and lines. In order to improve the transmission rate of wireless mesh network and solve new interference and energy loss problem after adjusting Delaunay graph to achieve a gateway deployment of wireless mesh network using directional antenna, the algorithm reduces wireless links that the transmission distance is too long and energy consumption is higher, and defines the upper limit of the number of directional antenna on routing nodes. The simulation results show that this algorithm can minimize the number of gateway and the shorten network transmission distance from route node to gateway node. This algorithm can effectively decrease the deployment cost and interference by using less antennas and promote the network performance at the same time.
Multiple Framework QoE Model based Energy Efficient Transmission Strategy in LTE Networks
Ge Zhihui,Tang Liping,Li Taoshen,Li Qinghua 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.8
Wireless technology is continuously evolving, and the development of new versions of adaptive protocols and mechanisms are at their peak to achieve high performance in network-based applications and services. LTE networks offer broadband wireless access to users who can benefit from high data rate applications such as video streaming. However, the high energy consumption of these applications has not been considered. The end user quality of experience (QoE) of video delivery over a radio network is mainly influenced by the radio parameters in the radio access network. This paper will present a multiple framework QoE model for video delivery over LTE, denoted as MQoE that measures the overall perceived quality of mobile video delivery from subjective user experience and objective system performance. We propose a QoE-based energy efficient mechanism to reduce smartphones’ power consumption. We have done a series of experiments to verify the efficiency of this model. Experiment results show that MQoE has significant improvement at energy efficiency
Cloud-based Energy-Efficiency XMPP Protocol for Mobile Network
Ge Zhihui,Cen Xiao,Wang Hailiang,Li Taoshen 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.6
Using the Cloud-based Offloading heartbeat aggregation method can solve the smart mobile terminal bearing the burden of persistent connections. It effectively reduces the heartbeat storm. But with the popularity of MTC (Many-Task Computing), especially in the environment of MMTC (Mobile MTC), using XMPP to communicate cause high energy consumption problem at the same time. The traditional XMPP protocol format already cannot adapt to the high performance transmission under the new environment. This paper is based on the MMTC environment, proposed the new communication method of mobile terminal and cloud with XMPP protocol to achieve more energy efficiency.