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Xiong-Jun Li,Albert Ting-pat So 한국과학기술원 인간친화 복지 로봇 시스템 연구센터 2002 International Journal of Assistive Robotics and Me Vol.3 No.3
A new pattern landmark has been designed and its detection and identification algorithms are proposed for an efficient CAD model-based localisation system for a vision-aided mobile robot. The known horizontal projection model of the vertical wall closed to the landmark, together with the sensed positions based on a CAD-model relative to the robot, help to determine the robot"s current position without any reference to its previous positions. The landmark is used to guide the searching process while the local CAD model is used for localisation. The accurate co-ordinates of the landmark are not important. A self-similar landmark with bar-colour-coding pattern after defining a "barlet" function is designed such that an upward-aiming camera can reliably detect it even if it is partially blocked by unforeseeable obstructions. The landmark can be effectively detected and recognised by using wavelet-based MRA for landmark searching and matching the colour pattern one by one with the pre-tested colour bands of HSV space for landmark recognition. Experimental results show the feasibility of the proposed landmark and its identification algorithm for localisation.
Experimental study on performance of steam-water injector with central water nozzle arrangement
Wen Jun Li,Dao Tong Chong,Jun Jie Yan,Wei Xiong Chen,Jin Shi Wang 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.9
The steam-water injector (SI) is a simple mechanical device that has been widely used in industry. Wedid an experimental study to find the influence of physical and geometrical parameters on performance of the SI. Thephysical parameters studied were steam inlet pressure, water inlet pressure and water inlet temperature. Whereas, thegeometrical parameters studied were steam nozzle area ratio, area ratio of steam nozzle to water nozzle and the mixingsection converging angle. Pump head was introduced to evaluate the lifting-pressure performance of the SI under dif-ferent operating and geometrical conditions. Optimal values of steam nozzle area ratio and mixing section convergingangle were 1.3 and 11.6orespectively, for the present work, and optimal value of area ratio of steam nozzle to waternozzle increased with increasing water inlet pressure. Two head-capacity curves were introduced to highlight the effectof various physical and geometrical parameters on the performance of SI.
( Bo Xu ),( Fu Ya Yang ),( Cai Yun Xiong ),( Jun Jun Li ),( Xiang Hua Tang ),( Jun Pei Zhou ),( Zhen Rong Xie ),( Jun Mei Ding ),( Yun Juan Yang ),( Zun Xi Huang ) 한국미생물 · 생명공학회 2014 Journal of microbiology and biotechnology Vol.24 No.4
To isolate novel and useful microbial enzymes from uncultured gastrointestinal microorganisms, a fecal microbial metagenomic library of the pygmy loris was constructed. The library was screened for amylolytic activity, and 8 of 50,000 recombinant clones showed amylolytic activity. Subcloning and sequence analysis of a positive clone led to the identification a novel gene (amyPL) coding for α-amylase. AmyPL was expressed in Escherichia coli BL21 (DE3) and the purified AmyPL was enzymatically characterized. This study is the first to report the molecular and biochemical characterization of a novel α-amylase from a gastrointestinal metagenomic library.
Jun Xiong,Jing Luo,Lei Yang,Jingyu Pang,Wenshuai Zhu,Huaming Li 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.64 No.-
Boron defect engineered boron nitride (BN) nanosheets have been prepared with the barbituric acid as co-reactant sources. By virtue of B defects, the electronic structure of BN undergo significantly variation, in which the conduction band of BN declined from −1.35 to −0.54 eV and decreased chemical acid hardness. After B defect engineering, BN nanosheets display greatly improved adsorptive desulfurization performance towards dibenzothiophene (DBT), with optimized adsorption capacity of 43.6 mgS g−1 for model oil. The increased adsorptive desulfurization performance was derived from decreased chemical acid hardness by B defect engineering, thus can build preferable interplay between the soft base DBT.
Xiong, Hai-Lin,Liu, Xun-Qi,Sun, Ai-Hua,He, Ying,Li, Jun,Xia, Yuan Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.5
Associations of P16, MGMT, hMLH1 and hMLH2 with gastric cancer and their relation with MTHFR status in gastric patients who were confirmed with pathological diagnosis were assessed. Aberrant DNA methylation of P16, MGMT, hMLH1 and hMLH2 and polymorphisms of MTHFR C677T were assayed. The proportional DNA hypermethylation in P16, MGMT, hMLH1 and hMLH2 in cancer tissues was significantly higher than in remote normal-appearing tissues. DNA hypermethylation of P16 and MGMT was correlated with the T and N stages. Individuals with homozygotes (TT) of MTHFR C677T had significant risk of hypermethylation of MGMT in cancer tissues [OR (95% CI)= 3.47(1.41-7.93)]. However, we did not find association between polymorphism in MTHFR C677T and risk of hypermethylation in P16, MGMT, hMLH1 and hMLH2 genes either in cancer or remote normal-appearing tissues. Aberrant hypermethylation of P16, MGMT, hMLH1 and hMLH2 could be predictive of gastric cancer.
KBTBD7, a novel human BTB-kelch protein, activates transcriptional activities of SRE and AP-1
( Jun Jian Hu ),( Wu Zhou Yuan ),( Ming Tang ),( Yue Qun Wang ),( Xiong Wei Fan ),( Xiao Yang Mo ),( Yong Qing Li ),( Zao Chu Ying ),( Yong Qi Wan ),( Karen Ocorr ),( Rolf Bodmer ),( Yun Deng ),( Xiu 생화학분자생물학회 2010 BMB Reports Vol.43 No.1
Xiong, Shang-Ling,Yue, Li-Mei,Lim, Gyu Tae,Yang, Jun-Mo,Lee, Jinhyuk,Park, Yong-Doo Elsevier 2018 INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES Vol.113 No.-
<P><B>Abstract</B></P> <P>Inhibition of α-glucosidase is directly associated with treatment of type 2 diabetes. In this regard, we conducted enzyme kinetics integrated with computational docking simulation to assess the inhibitory effect of raspberry ketone (RK) on α-glucosidase. RK bound to the active site of α-glucosidase and interacted with several key residues such as ASP68, TYR71, HIS111, PHE157, PHE158, PHE177, GLN181, ASP214, THR215, ASP349, ASP408, and ARG439, as detected by protein-ligand docking simulation. Subsequently, we confirmed the action of RK on α-glucosidase as the non-competitive type of inhibition in a reversible and rapidly binding manner. The relevant kinetic parameters were <I>IC</I> <SUB>50</SUB> =6.17±0.46mM and <I>K</I> <SUB> <I>i</I> </SUB> =7.939±0.211mM. Regarding the structure-activity relationship, the higher concentration of RK induced slight modulation of the shape of the active site as monitored by hydrophobic exposure. The tertiary conformational change was linked to RK inhibition, and mostly involved regional changes of the active site. Our study provides insight into the functional role of RK due to its structural property of a hydroxyphenyl ring that interacts with the active site of α-glucosidase. We suggest that similar hydroxyphenyl ring compounds targeting the key residues of the active site might be potential α-glucosidase inhibitors.</P>
PRIAM: Privacy Preserving Identity and Access Management Scheme in Cloud
( Jinbo Xiong ),( Zhiqiang Yao ),( Jianfeng Ma ),( Ximeng Liu ),( Qi Li ),( Jun Ma ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.1
Each cloud service has numerous owners and tenants, so it is necessary to construct a privacy preserving identity management and access control mechanism for cloud computing. On one hand, cloud service providers (CSP) depend on tenant`s identity information to enforce appropriate access control so that cloud resources are only accessed by the authorized tenants who are willing to pay. On the other hand, tenants wish to protect their personalized service access patterns, identity privacy information and accessing newfangled cloud services by on-demand ways within the scope of their permissions. There are many identity authentication and access control schemes to address these challenges to some degree, however, there are still some limitations. In this paper, we propose a new comprehensive approach, called Privacy pReserving Identity and Access Management scheme, referred to as PRIAM, which is able to satisfy all the desirable security requirements in cloud computing. The main contributions of the proposed PRIAM scheme are threefold. First, it leverages blind signature and hash chain to protect tenant`s identity privacy and implement secure mutual authentication. Second, it employs the service-level agreements to provide flexible and on-demand access control for both tenants and cloud services. Third, it makes use of the BAN logic to formally verify the correctness of the proposed protocols. As a result, our proposed PRIAM scheme is suitable to cloud computing thanks to its simplicity, correctness, low overhead, and efficiency.