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- 저자 : Junsong Liu (검색결과 5 건)
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A Reliable Information Fusion Algorithm for Reputation Based Wireless Sensor Networks
Teng Ma,Yun Liu,Junsong Fu,Ya Jing 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.1
In wireless sensor networks (WSNs), cryptographic primitives alone cannot provide a sufficient solution to the secure information fusion problem, therefore reputation systems have been introduced into WSNs. In a cluster, each sensor node has a single reputation value that is evaluated by the other sensor nodes in the same cluster. In this paper, we propose a novel, reliable information fusion algorithm, called reputation-driven information fusion (RDIF). In this work, a clustering algorithm is employed to divide all of the sensor nodes into many clusters. Then, a reputation system is established for each cluster, and an information fusion algorithm driven by reputation values is performed by the cluster head. In addition to the sensor nodes’ reputation values, we also consider the values of the readings collected by the sensor nodes and eliminate the outliers before fusing information. The simulation results show that RDIF can improve the reliability and accuracy of fusion results significantly when some compromised nodes appear in the WSNs.
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Qiliang Wang,Qi Yu,Junsong Liu,Taotao Ai,Hongdong Li 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.6
Zinc oxide (ZnO) nanorods (NRs) have been synthesized as a template to fabricate TiO2 nanotubes (TiNTs) on hemispherical diamond film by liquid-phase deposition (LPD) method. The process concerning the formation of TiNTs was analyzed. Based on the results of XRD and Raman spectroscopy, it is demonstrated that TiNTs was successfully obtained after removing ZnO NRs by chemical etching at room temperature. The TiNTs on hemispherical diamond film show higher performance photocatalysis, examined by the degradation of the reactive yellow 15(RY15) solution. The corresponding mechanism is discussed.
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Forest Fire Monitoring Based on Mixed Wireless Sensor Networks
Teng Ma,Yun Liu,Junsong Fu,Ya Jing 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.3
Forest fires can be fatal threats. Motivated by the need to detect fire early and locate forest fires clearly, in this paper, we propose a paradigm called the forest fire monitoring paradigm (FFMP). The purpose of the FFMP is for forest fire early detection and locating based on mixed wireless sensor networks (WSNs). Different from pure static and mobile WSNs, mixed WSNs are composed of both mobile sensor nodes and static sensor nodes. Mixed WSNs are a tradeoff between cost and coverage. In the FFMP, the mobile sensor nodes perform as cluster heads and they will construct a backbone network in which the mobile sensor nodes can connect with their neighbors and be capable of transmitting data to the base station. Each static sensor node chooses one neighboring mobile sensor node as its cluster head and uploads the generated messages to the cluster head. The mobile sensor nodes then fuses the information and transfers the fusion results to the base station, where the data were further processed to obtain the temperature distribution graph and locate the fires. The simulation illustrates that our approach performs well in early forest fire detection and locating. In addition, our approach can significantly prolong the lifetime of WSNs.
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Functionally graded shape memory alloys: Design, fabrication and experimental evaluation
Shariat, Bashir S.,Meng, Qinglin,Mahmud, Abdus S.,Wu, Zhigang,Bakhtiari, Reza,Zhang, Junsong,Motazedian, Fakhrodin,Yang, Hong,Rio, Gerard,Nam, Tae-hyun,Liu, Yinong Elsevier 2017 Materials & Design Vol.124 No.-
<P><B>Abstract</B></P> <P>Functionally graded shape memory alloys have the advantage of combining the functionalities of the shape memory effect and those of functionally graded structures. By proper design, they can exhibit new and complex deformation behaviour that is unmatched in uniform shape memory alloys. One obvious advantage of functionally graded shape memory alloys is their widened transformation stress and temperature windows that provide improved controllability in actuating applications. This paper reports on the concept, fabrication, experimentation and thermomechanical behaviour of several designs of functionally graded NiTi alloys, including compositionally graded, microstructurally graded and geometrically graded NiTi alloys, and the various techniques that may be used to create these functionally graded materials. It is found that the property gradients created along the loading direction or perpendicular to the loading direction produce distinct thermomechanical behaviours. The property gradient along the loading direction provides stress gradient over stress-induced transformation, which can be adjusted by the property gradient profile. The property gradient through the thickness direction of plate specimens and perpendicular to the loading direction provides four-way shape memory behaviour during stress-free thermal cycling after tensile deformation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Functionally graded shape memory alloys provide widened transformation stress and temperature windows in actuation application. </LI> <LI> The property gradient was achieved in three ways: microstructural gradient, compositional gradient and geometrical gradient. </LI> <LI> Property gradients created along the loading direction or perpendicular to that direction produce distinct thermomechanical behaviours. </LI> <LI> A variety of techniques has been proposed for fabricating functionally graded shape memory alloy structures. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Chongwen Xu,Yuan Shao,Wanli Ren,Hao Dai,Fangli Yang,Xiang Li,Shaoqiang Zhang,Junsong Liu,Xiaobao Yao,Qian Zhao,Xin Sun,Zhiwei Zheng 한국분자세포생물학회 2023 Molecules and cells Vol.46 No.6
Papillary thyroid carcinoma (PTC) is the most common subtype of thyroid carcinoma. Despite a good prognosis, approximately a quarter of PTC patients are likely to relapse. Previous reports suggest an association between S-phase kinase-associated protein 2 (SKP2) and the prognosis of thyroid cancer. SKP1 is related to apoptosis of PTC cells; however, its role in PTC remains largely elusive. This study aimed to understand the expression and molecular mechanism of SKP2 in PTC. SKP2 expression was upregulated in PTC tissues and closely associated with clinical diagnosis. In vitro and in vivo knockdown of SKP2 expression in PTC cells suppressed cell growth and proliferation and induced apoptosis. SKP2 depletion promoted cell autophagy under glucose deprivation. SKP2 interacted with PH domain leucine-rich repeat protein phosphatase-1 (PHLPP1), triggering its degradation by ubiquitination. Furthermore, SKP2 activates the AKT-related pathways via PHLPP1, which leads to the cytoplasmic translocation of SKP2, indicating a reciprocal regulation between SKP2 and AKT. In conclusion, the upregulation of SKP2 leads to PTC proliferation and survival, and the regulatory network among SKP2, PHLPP1, and AKT provides novel insight into the molecular basis of SKP2 in tumor progression.
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