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A Distributed Coverage Algorithm for Multi-UAV with Average Voronoi Partition
Sai Chen,Chaoyong Li,Shuo Zhuo 제어로봇시스템학회 2017 제어로봇시스템학회 국제학술대회 논문집 Vol.2017 No.10
In this paper, we propose a distributed coverage algorithm for a group of UAVs to cover a convex region with average Voronoi partition which aims to ensure the areas of all Voronoi partitions are identical. The proposed algorithm iteratively updates the Voronoi partition through local information exchange with neighbors, and then moves along the computed direction. Different from existing results, the proposed algorithm could make the area difference infinitely small in theory to achieve indeed average area coverage. Simulation results are provided to illustrate the effectiveness of the proposed algorithm.
A Novel Preserving Client Privacy and Designate Verifier Auditing Scheme for Cloud Storage
Jiang Xu,Wenliang Chen,Sai Ji,Yongjun Ren,Jin Wang 보안공학연구지원센터 2015 International Journal of Security and Its Applicat Vol.9 No.1
Cloud storage is now an important development trend in information technology. To ensure the integrity of data storage in cloud storing, researchers have present some proof of storage schemes. In some cases, the ability to check data possession is delegated by data owners. Hence, the delegable provable data possession and proxy provable data possession are proposed. However the schemes are not secure since the proxy or designated verifier stores some delegation information in cloud storage servers. In this paper, we propose PC-DV POS scheme, which can preserve clients’ privacy and designate a verifier by the client signed the data blocks. In particular, we utilize group signatures and key exchange to construct homomorphic authenticators, so that only the designated verifier is able to check the integrity of shared data for users without retrieving the entire data, and cannot reveal the identities of signers on all blocks in shared data.
Human’s Gesture Recognition and Imitation Based on Robot NAO
Chen Wenbai,Wu Xibao,Wang Sai,Gao Hui 보안공학연구지원센터 2015 International Journal of Signal Processing, Image Vol.8 No.12
Based on Kinect platform, human’s gesture recognition and imitation were realized by humanoid robot NAO in this paper. The hardware system structure of Kinect platform and the principle of human skeleton extraction were mainly introduced firstly. From the image, Kinect camera gets the skeletal point information which is used to compared with preset posture of the skeletal information. Through calculate the angle between the different bones, the computer obtains the human’s posture and sends the instructions to the robot. In the physical experiments, NAO robot receives the pre-programmed corresponding action instructions and imitates the corresponding motions of humans.
Multi-scale Diffusion-based Salient Object Detection with Background and Objectness Seeds
( Sai Yang ),( Fan Liu ),( Juan Chen ),( Dibo Xiao ),( Hairong Zhu ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.10
The diffusion-based salient object detection methods have shown excellent detection results and more efficient computation in recent years. However, the current diffusion-based salient object detection methods still have disadvantage of detecting the object appearing at the image boundaries and different scales.To address the above mentioned issues, this paper proposes a multi-scale diffusion-based salient object detection algorithm with background and objectness seeds. In specific, the image is firstly over-segmented at several scales. Secondly, the background and objectness saliency of each superpixel is then calculated and fused in each scale. Thirdly, manifold ranking method is chosen to propagate the Bayessian fusion of background and objectness saliency to the whole image. Finally, the pixel-level saliency map is constructed by weighted summation of saliency values under different scales. We evaluate our salient object detection algorithm with other 24 state-of-the-art methods on four public benchmark datasets, i.e., ASD, SED1, SED2 and SOD. The results show that the proposed method performs favorably against 24 state-of-the-art salient object detection approaches in term of popular measures of PR curve and F-measure. And the visual comparison results also show that our method highlights the salient objects more effectively.
Sai Liu,Yajie Gao,Xiaogang Chen,Zhaoqun Du 한국섬유공학회 2019 Fibers and polymers Vol.20 No.8
When auxetic yarns with helical wrapping structure are axially stretched, pressure and friction between the yarncomponents exist during the deformation. The tensile property of auxetic yarns not only depends on the materials of the twocomponents, but also the structure of the yarns. Thus, the structuring effects on the tensile properties were studied bytheoretical modelling with the series arrangement of a linear spring and a Newton dashpot. Besides, analysing theexperimental results by the OriginPro 9 software, the effectiveness of theoretical model was validated and all the values ofcorrelation coefficients were higher than 0.97. The relations between stress and strain were presented and it was expected tobe used for predicting the tensile property of auxetic yarns with different helical angles.
Stability of Zirconium Metal Organic Frameworks with 9,10- Dicarboxylic Acid Anthracene as Ligand
Xiao, Sheng-Bao,Chen, Sai-Sai,Liu, Jin,Li, Zhen,Zhang, Feng-Jun,Wang, Xian-Biao,Oh, Won-Chun The Korean Ceramic Society 2016 한국세라믹학회지 Vol.53 No.2
With high specific surface area and pore structural diversity, MOFs show important applications in gas storage, catalysis, sensing, separation, and biomedicine. However, the stability of the structure of MOFs has restricted their application and development. In this study, zirconium metal organic frameworks with 9,10-dicarboxylic acid anthracene as ligand, named UIO-66 ($H_2DCA$), were synthesized and their properties and structures were characterized by XRD, SEM, and $N_2$ adsorption. We focus on the stability of the structure of UIO-66 ($H_2DCA$) under different conditions (acid, alkali, and water). The structural changes or ruins of UIO-66 ($H_2DCA$) were traced by means of XRD, TG, and FT-IR under different conditions. The results show that the UIO-66 ($H_2DCA$) materials are stable at 583 K, and that this structural stability is greatly influenced by different types of acid and alkali compounds. Importantly, we found that the structures maintain their stability in environments of nitric acid, triethylamine, and boiling water.
INTRINSIC HARDNESS OF Ti(C,N) FILMS AND ITS DEPENDENCE ON MICROSTRUCTURE
Xu, Ke-Wei,Bai, Chen-Dong,Hu, Nai-Sai 한국재료학회 1995 Fabrication and Characterization of Advanced Mater Vol.1 No.2
The intrinsic hardness of Ti(C, N) films with a series of carbon content is investigated using Joensson-Hogmark method, but the constrnat, C, in J-H model is modified in terms of the hardness ratio of the film to the substrate. A linear relation between hardness and carbon content is evident for both ion plated and plasma assisted chemical vapour deposited films, but the latter has higher hardness and greater variation with carbon content. This is considered to be a result of TiN and TiC mixutre phases, which probally gives rise to small grain size and less columnar structure.
Targeted Editing of Myostatin Gene in Sheep by Transcription Activator-like Effector Nucleases
Zhao, Xinxia,Ni, Wei,Chen, Chuangfu,Sai, Wujiafu,Qiao, Jun,Sheng, Jingliang,Zhang, Hui,Li, Guozhong,Wang, Dawei,Hu, Shengwei Asian Australasian Association of Animal Productio 2016 Animal Bioscience Vol.29 No.3
Myostatin (MSTN) is a secreted growth factor expressed in skeletal muscle and adipose tissue that negatively regulates skeletal muscle mass. Gene knockout of MSTN can result in increasing muscle mass in sheep. The objectives were to investigate whether myostatin gene can be edited in sheep by transcription activator-like effector nucleases (TALENs) in tandem with single-stranded DNA oligonucleotides (ssODNs). We designed a pair of TALENs to target a highly conserved sequence in the coding region of the sheep MSTN gene. The activity of the TALENs was verified by using luciferase single-strand annealing reporter assay in HEK 293T cell line. Co-transfection of TALENs and ssODNs oligonucleotides induced precise gene editing of myostatin gene in sheep primary fibroblasts. MSTN gene-edited cells were successfully used as nuclear donors for generating cloned embryos. TALENs combined with ssDNA oligonucleotides provide a useful approach for precise gene modification in livestock animals.
Xue-Song Sun,Di-Han Liu,Sai-Lan Liu,Qiu-Yan Chen,Shan-Shan Guo,Yue-Feng Wen,Li-Ting Liu,Hao-Jun Xie,Qing-Nan Tang,Yu-Jing Liang,Xiao-Yun Li,Jin-Jie Yan,Ming-Huang Hong,Jun Ma,Lin-Quan Tang,Hai-Qiang M 대한암학회 2019 Cancer Research and Treatment Vol.51 No.4
Purpose The purpose of this study was to investigate the survival trends and patterns of failure in patients with stage II nasopharyngeal carcinoma (NPC) treated with radiotherapy (RT) and chemotherapy over the last 20 years. Materials and Methods Thirty-eight hundred and eight patients diagnosed with stage II NPC between January 1990 and December 2012 were involved in this retrospective cohort study. All patients were treated with RT. According to the main imaging techniques and RT technology, we categorized these patients into four calendar periods: 1990-1996, 1997-2002, 2003-2007, and 2008-2012. Overall survival (OS), progression-free survival (PFS), locoregional relapse-free survival (LRFS), and distant metastasis–free survival (DMFS) were served as the clinical outcome. Results After a median follow-up period of 84.7 months, we observed increasing trends in survival and disease control. The 3- and 5-year OS rates increased from 87.1% and 78.7% in the first calendar period to 97.4% and 94.5% in the last calendar period, respectively (p < 0.001). Additionally, significant increasing trends could be seen in the PFS and LRFS during the four calendar periods. In the subgroup analysis, the LRFS in patients older than 50 years at diagnosis showed greater improvement than younger patients. However, the rate of distant metastasis was stable and relatively low, as the 5-year DMFS ranged from 90.5% to 94.7% among the four calendar periods. Conclusion The survival rates in patients with stage II NPC showed increasing trends from 1990 to 2012. The advance of RT provided excellent locoregional control and enhanced OS.
Choon Jin Ooi,Ida Hilmi,Rupa Banerjee,Sai Wei Chuah,Siew Chien Ng,Govind K Makharia,Pises Pisespongsa,Min Hu Chen,Zhi Hua Ran,Byong Duk Ye,Dong Il Park,Khoon Lin Ling,David Ong,Vineet Ahuja,Khean Lee 대한장연구학회 2019 Intestinal Research Vol.17 No.3
The Asia-Pacific Working Group on inflammatory bowel disease (IBD) was established in Cebu, Philippines, under the auspices of the Asian Pacific Association of Gastroenterology with the goal of improving IBD care in Asia. This consensus is carried out in collaboration with Asian Organization for Crohn’s and Colitis. With biologic agents and biosimilars becoming more established, it is necessary to conduct a review on existing literature and establish a consensus on when and how to introduce biologic agents and biosimilars in the conjunction with conventional treatments for ulcerative colitis (UC) and Crohn’s disease (CD) in Asia. These statements also address how pharmacogenetics influence the treatments of UC and CD and provide guidance on response monitoring and strategies to restore loss of response. Finally, the review includes statements on how to manage treatment alongside possible hepatitis B and tuberculosis infections, both common in Asia. These statements have been prepared and voted upon by members of IBD workgroup employing the modified Delphi process. These statements do not intend to be all-encompassing and future revisions are likely as new data continue to emerge.