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Enabling Context-aware Smart Home with Semantic Web Technologies
Daqing Zhang,Tao Gu,Xiaohang Wang 한국과학기술원 인간친화 복지 로봇 시스템 연구센터 2005 International Journal of Assistive Robotics and Me Vol.6 No.4
Context-awareness has emerged as a key enabling technology for future smart homes. In this paper, we propose a generic layered model (the Context Stack) to guide the context-aware system design. We investigate the use of Semantic Web technologies in context modeling and reasoning. A Web Ontology based context model (CONON) is defined to facilitate explicit context representation, semantic context sharing, and logic reasoning. We show how the use of logic reasoning enables context-aware services to deduce high-level, implicit context from low-level, explicit context. In particular, we integrate the temporal ontology into our ontology model to facilitate annotating and reasoning about temporal context information. Following the general layered model, we present an OSGi-based context-aware service architecture for smart homes. We also build the smart home prototype with context-aware services.
Jian Zhang,Xiaohang Li,Fanglai Zhu 제어·로봇·시스템학회 2016 International Journal of Control, Automation, and Vol.14 No.3
In this paper, we consider problems of state estimation, unknown input, and measurement noise reconstructionfor a class of Lipschitz nonlinear systems. By extending the measurement noise as an auxiliary statevector, the original system is transformed into an augmented descriptor system. Then an adaptive H∞ observeris developed for estimating the states, unknown input and measurement noise simultaneously. Further, sufficientconditions of the existence of the adaptive H∞ observer are given in the form of linear matrix inequality, which canbe solved easily via some efficient mathematic tools. Finally, two simulation examples are given to illustrate theeffectiveness of the proposed method.
Jiancheng Zhang,Jun Li,Fanglai Zhu,Xiaohang Li 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.6
This paper develops a new unknown input observer (UIO) design method for a class of discrete-timelinear descriptor systems when the observer matching condition is not satisfied. By equivalent transformations, thestate and unknown input observations of the descriptor system are changed to the UIO design problem for a generallinear dynamic system firstly. Then based on some further discussion on the concept of the system left invertibility,a new auxiliary output vector is constructed which allows us to remove the unknown inputs from the dynamicequation, and thereby a Luenberger-type observer can be constructed. One of the advantages of the present methodis that it can work only under the single strongly detectable condition. Finally, a simulation example is given toverify the effectiveness and show the superiorities of our methods.
Kai Liu,Xiaohang Zhang,Hao Wang,Xuwen He,Zhonghua Shangguan,Yali Shi,Shipeng Yang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.5
Composite carbon-based nano-zero-valent iron materials not only have excellent characteristics of nano materials, but also solve the difficulty of recycling nano materials after use, and overcome the shortcomings of the nano materials. The introduction of copper increases the redox reaction activity of the micro-electrolytic material and expands the applicable pH range of the reaction environment. In the range of pH = 3–9, the removal efficiency of dichloromethanesulfonic acid (Cl2-MSA) was maintained at 95.5–99.7% after 30 min. Continuous dynamic simulation experiments verified that the composite carbon-based nano zero-valent iron material has a stable removal effect on the target pollutants.
Chenhang Yan,Wei Zhang,Xiaohang Li,Yuchen Qian 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.11
In this paper, we investigate the problem of observer-based time-varying leader-following formation tracking for multi-agent systems with the one-sided Lipschitz and quadratic inner- boundedness nonlinear dynamics.An idea of the observer-based protocol with an edge-based adaptive law is designed for nonlinear systems, which enable agents to achieve a desired formation tracking when it cannot obtain the full state of the nonlinear system. In contrast to the previous nonlinear formation systems, the advantage of the developed method is that it is less conservative and more general for the nonlinear system with large Lipschitz constants. Besides, under the proposed adaptive law, the design of the protocol does not rely on the known communication topology. Finally, the simulation results for one leader and six followers are proposed to show the feasibility and effectiveness of the proposed method in the nonlinear time-varying formation system.
Yani Guo,Ming Li,Xuan Wen,Xiaohang Guo,Tiantian Zhang 한국섬유공학회 2022 Fibers and polymers Vol.23 No.7
Superhydrophilic and underwater superoleophobic membrane materials have been widely studied owing to theirexcellent separation efficiency. However, the oil-fouling problem is a major drawback limiting their practical oil/waterseparation applications. Herein, a silica-enhanced functionalized poly(styrene-alt-maleic anhydride)/fluorocarbon surfactantnanofibrous composite membrane (f-PSMA/FS/SiO2) with underwater superoleophobicity was fabricated by theelectrospinning method. The uniformly dispersed silica nanoparticles not only increased the roughness of the as-preparedcomposite membrane but also substantially improved the underwater superoleophobicity. Therefore, the as-preparedcomposite membrane showed excellent underwater anti-oil-fouling performance, thus preventing the decrease in theseparation efficiency and flux caused by membrane fouling during oil/water separation. Throughout 60 separation cyclessolely driven by gravity, the separation efficiencies were above 99.27 %, and the flux remained higher than 3743 L m-2 h-1. More importantly, the as-prepared composite membrane maintained exceptional underwater superoleophobicity in a harshenvironment (30 wt% NaCl for 12 h, pH 1 (HCl) for 12 h, oven temperature at 90 °C for 2 h). Thus, because of its robustthermal stability and chemical durability, the antifouling f-PSMA/FS/SiO2 composite membrane has tremendous potential forfuture practical applications in the treatment of oily wastewater.
Multi-scale and Interactive Visual Analysis of Public Bicycle System
( Xiaoying Shi ),( Yang Wang ),( Fanshun Lv ),( Xiaohang Yang ),( Qiming Fang ),( Li Zhang ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.6
Public bicycle system (PBS) is a new emerging and popular mode of public transportation. PBS data can be adopted to analyze human movement patterns. Previous work usually focused on specific scales, and the relationships between different levels of hierarchies are ignored. In this paper, we introduce a multi-scale and interactive visual analytics system to investigate human cycling movement and PBS usage condition. The system supports level-of-detail explorative analysis of spatio-temporal characteristics in PBS. Visual views are designed from global, regional and microcosmic scales. For the regional scale, a bicycle network is constructed to model PBS data, and an flow-based community detection algorithm is applied on the bicycle network to determine station clusters. In contrast to the previous used Louvain algorithm, our method avoids producing super-communities and generates better results. We provide two cases to demonstrate how our system can help analysts explore the overall cycling condition in the city and spatio-temporal aggregation of stations.
Gao Ran,Guo Wenjun,Fan Tianfei,Pang Junling,Hou Yangfeng,Feng Xiaohang,Li Bolun,Ge Weipeng,Fan Tianhui,Zhang Tiantian,Lu Jiakai,Jing He,Jin Mu,Yan Chen,Wang Jing 생화학분자생물학회 2022 Experimental and molecular medicine Vol.54 No.-
Abdominal aortic aneurysm (AAA) is a permanent expansion of the abdominal aorta that has a high mortality but limited treatment options. Phosphodiesterase (PDE) 4 family members are cAMP-specific hydrolyzing enzymes and have four isoforms (PDE4A-PDE4D). Several pan-PDE4 inhibitors are used clinically. However, the regulation and function of PDE4 in AAA remain largely unknown. Herein, we showed that PDE4D expression is upregulated in human and angiotensin II-induced mouse AAA tissues using RT-PCR, western blotting, and immunohistochemical staining. Furthermore, smooth muscle cell (SMC)-specific Pde4d knockout mice showed significantly reduced vascular destabilization and AAA development in an experimental AAA model. The PDE4 inhibitor rolipram also suppressed vascular pathogenesis and AAA formation in mice. In addition, PDE4D deficiency inhibited caspase 3 cleavage and SMC apoptosis in vivo and in vitro, as shown by bulk RNA-seq, western blotting, flow cytometry and TUNEL staining. Mechanistic studies revealed that PDE4D promotes apoptosis by suppressing the activation of cAMP-activated protein kinase A (PKA) instead of the exchange protein directly activated by cAMP (Epac). Additionally, the phosphorylation of BCL2-antagonist of cell death (Bad) was reversed by PDE4D siRNA in vitro, which indicates that PDE4D regulates SMC apoptosis via the cAMP-PKA-pBad axis. Overall, these findings indicate that PDE4D upregulation in SMCs plays a causative role in AAA development and suggest that pharmacological inhibition of PDE4 may represent a potential therapeutic strategy.
Lee, Seunghun,Wang, Haihang,Gopal, Priya,Shin, Jongmoon,Jaim, H. M. Iftekhar,Zhang, Xiaohang,Jeong, Se-Young,Usanmaz, Demet,Curtarolo, Stefano,Fornari, Marco,Buongiorno Nardelli, Marco,Takeuchi, Ichir American Chemical Society 2017 Chemistry of materials Vol.29 No.21
<P>By combining high-throughput experiments and first-principles calculations based on the DFT-ACBN0 approach, we have investigated the energy band gap of Sr-, Pb-, and Bi-substituted BaSnO<SUB>3</SUB> over wide concentration ranges. We show that the band gap energy can be tuned from 3 to 4 eV by chemical substitution. Our work indicates the importance of considering the mixed-valence nature and clustering effects upon substitution of BaSnO<SUB>3</SUB> with Pb and Bi. Starting from the band gap of ∼3.4 eV for pure BaSnO<SUB>3</SUB>, we find that Pb substitution changes the gap in a nonmonotonic fashion, reducing it by as much as 0.3 eV. Bi substitution provides a monotonic reduction but introduces electronic states into the energy gap due to Bi clustering. Our findings provide new insight into the ubiquitous phenomena of chemical substitutions in perovskite semiconductors with mixed-valence cations that underpin their physical properties.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cmatex/2017/cmatex.2017.29.issue-21/acs.chemmater.7b03381/production/images/medium/cm-2017-03381d_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/cm7b03381'>ACS Electronic Supporting Info</A></P>