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Fast Secret Key Generation Based on dynamic Private Pilot from Static Wireless Channels

China Communications 2018年第11期15卷 171-183页

作者： Yu Huang Liang Jin Hongquan Wei Zhou Zhong Shengjun Zhang National Digital Switching System Engineering and Technological R&D Center Zhengzhou 450002 China.

In static or quasi-static wireless channel environments, secret key generation(SKG) based on wireless channels is vulnerable to active attacks due to the openness and invariance of public pilot, especially man-inthe-middle(MITM) attacks, where attacker acts as a transparent relay to manipulate channel measurements and derive the generated keys. In order to fight against this attack, a dynamic private pilot is designed, where both private pilot and secret key are derived from the characteristics of wireless channels and private to third party. In static or quasi-static environments, we use singular value decomposition techniques to reconstitute the wireless channels to improve the randomness of the wireless channels. Private pilot can encrypt and authenticate the wireless channels, which can make channel state information intercepted by MITM attacker reduced to zero and the SKG rate close to that without attacks. results of analysis and simulation show the proposed SKG scheme can withdraw the MITM attacks.

关键词： dynamic private pilot MITMattacks secret key generation wireless chan-nels physical layer security

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Improving Centralized Path Calculation Based on Graph Compression

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China Communications 2018年第6期15卷 120-124页

作者： Zhenglian Li Lixin Ji ruiyang Huang Shuxin Liu National Digital Switching System Engineering&Technological R&D Center ZhengzhouChina

Shortest-path calculation on weighted graphs are an essential operation in computer networks. The performance of such algorithms has become a critical challenge in emerging software-defined networks(SdN),since SdN controllers need to centralizedly perform a shortest-path query for every flow,usually on large-scale network. Unfortunately,one of the challenges is that current algorithms will become incalculable as the network size increases. Therefore, inspired by the compression graph in the field of compute visualization,we propose an efficient shortest path algorithm by compressing the original big network graph into a small one, but the important graph properties used to calculate path is reserved. We implement a centralized version of our approach in SdN-enabled network,and the evaluations validate the improvement compared with the well-known algorithms.

关键词： graph representation path compression shortest path

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Compact Tunable Balanced dual-band Bandpass Filter Using Tri-Stub Loaded resonator

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Journal of Physics: Conference Series 2021年第1期1914卷

作者： Hong Yang dewei Zhang Junjie Zhang Xian Wang Chenqing Pan Zhuang Ma Yufan Fu China National Digital Switching System Engineering and Technology R&D Center Zhengzhou 450001 China.

This letter proposes a tunable balanced dual-band bandpass filter (BPF) with high common-mode (CM) suppression based on tri-stub loaded resonator (TSLr). Two TSLrs terminated with varactor diodes are employed to obtain the tunable second differential-mode (dM) passband, which is independent of the first one. For validation, a tunable balanced dual-band BPF is designed, fabricated and measured that achieve the continuous frequency-tuning range of the second dM passband from 5.968 to 6.368 GHz with constant 3dB fractional bandwidth (FBW) of 6.8% ± 0.17% and CM rejection levels of over 30 dB. The measured results agree well with the simulated ones.

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Novel gold nanoparticles targeting somatostatin receptor subtype two with near-infrared light for neuroendocrine tumour therapy

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Nano research 2022年第10期15卷 9149-9159页

作者： Qichen Chen Zilin Li Jiangyuan Yu Qing Xie Haizhen Lu Yiqiao deng Jinghua Chen Wenjia Zhu Li Huo Yizhou Zhang Wei Song Jianqiang Lan Jianqiang Cai Zhen Huang Zixi Wang Hong Zhao Department of Hepatobiliary Surgery State Key Laboratory of Molecular OncologyNational Cancer Center/National Clinical Research Center for Cancer/Cancer HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100021China Key Laboratory of Gene Editing Screening and R&D of Digestive System Tumor Drugs Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100021China State Key Laboratory of Tribology Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China Department of Nuclear Medicine Key Laboratory of Carcinogenesis and Translational ResearchMinistry of EducationPeking University Cancer Hospital&InstituteBeijing 100142China Department of Pathology National Cancer Center/National Clinical Research Center for Cancer/Cancer HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeNo.17Panjiayuan NanliBeijing 100021China Nuclear Medicine Department State Key Laboratory of Complex Severe and Rare DiseasesCenter for Rare Diseases ResearchBeijing Key Laboratory of Molecular Targeted Diagnosis and Therapy in Nuclear MedicinePeking Union Medical College HospitalChinese Academy of Medical Science and Peking Union Medical CollegeBeijing 100005China Department of Biochemistry and Molecular Biology State Key Laboratory of Medical Molecular BiologyInstitute of Basic Medical Sciences Chinese Academy of Medical SciencesSchool of Basic MedicinePeking Union Medical CollegeBeijing 100005China Guangdong Research Center of Organoid Engineering and Technology Accurate International Biotechnology Co.Ltd.Guangzhou 510650China

Neuroendocrine tumours(NETs)are rare cancers with positive somatostatin receptor 2(SSTr2)expression,and treatment strategies for NETs are not ***-mediated therapy targeting SSTr2 in NETs is very *** study firstly combined mesoporous silica-coated gold nanorods(AuNrs@mSiO_(2))and targeting-SSTr2 dodecane tetraacetic acidtyrosine3-octreotate(dOTA-TATE)into AuNrs@mSiO_(2)@dOTA-TATE to investigate NETs inhibition under near-infrared ***@mSiO_(2)@dOTA-TATE showed good photothermal conversion *** vitro,under light irradiation,the cell viability significantly decreased with increasing AuNr@mSiO_(2)@dOTA-TATE concentration;in two successfully established neuroendocrine tumour organoids with SSTr2 expression,AuNrs@mSiO_(2)@dOTA-TATE with light inhibited tumours significantly better than AuNrs@mSiO_(2) with *** vivo,the SSTr2-targeting ability and biodistribution of AuNrs@mSiO_(2)@dOTA-TATE were confirmed with AuNrs@mSiO_(2)@64Cu-dOTA-TATE under micro-positron emission tomography/computed tomography(micro-PET/CT);in the AuNrs@mSiO_(2)@dOTA-TATE with laser group,the tumour surface temperature increased rapidly,with tumour volumes similar to those in the octreotide group and significantly lower than those in other *** was no significant difference in mice body weight between the AuNrs@mSiO_(2)@dOTA-TATE with laser group and other *** significant inflammatory lesions or cell necrosis was found in the main *** summary,we presented a feasible strategy to construct AuNrs@mSiO_(2)@dOTA-TATE with good photothermal conversion efficiency,targetingSSTr2 ability,significant antitumour effects,and good biocompatibility,warranting further explorations of AuNrs@mSiO_(2)@dOTA-TATE for NETs therapy applications.

关键词： neuroendocrine tumours somatostatin receptor 2 nanoparticles photothermal therapy

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Plastic Shavings by Laser: Peeling Porous Graphene Springs for Multifunctional All-Carbon Applications

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Advanced Science 2023年第21期10卷 e2301208页

作者： Kim, Chanwoo Hwang, Eunseung Kwon, Jinhyeong Jang, Tae Hwan Lee, Won Chul Kim, Shi Hyeong Park, Jongmin Lee, Ming-Tsang Kim, Hyun Hong, Sukjoon Lee, Habeom School of Mechanical Engineering Pusan National University Busan46241 Korea Republic of Optical Nanoprocessing Lab Department of Mechanical Engineering BK21 FOUR ERICA ACE Center Hanyang University Gyeonggi-do Ansan15588 Korea Republic of Intelligent Manufacturing System R&D Department Korea Institute of Industrial Technology Chungcheongnam-do Cheonan31056 Korea Republic of Division of Electrical Engineering Hanyang University ERICA Gyeonggi-do Ansan15588 Korea Republic of Department of Mechanical Engineering BK21 FOUR ERICA ACE Center Hanyang University Gyeonggi-do Ansan15588 Korea Republic of Department of Advanced Textile R&D Korea Institute of Industrial Technology Gyeonggi-do Ansan15588 Korea Republic of HYU-KITECH Joint Department Hanyang University Seoul04763 Korea Republic of Advanced Materials Division Korea Research Institute of Chemical Technology Daejeon34114 Korea Republic of Department of Power Mechanical Engineering National Tsing Hua University Hsinchu30013 Taiwan

Manufacturing strategies to create three-dimensional (3d) structures with multifunctional nanomaterials are of intense interest for fabricating building blocks in many electromechanical applications. A coil spring composed of graphene provides an important step toward the realization of all-carbon devices, as it is one of the essential elements for a wide range of systems. In this connection, here an unprecedented fabrication strategy to create a new type of 3d coil spring composed of laser-induced graphene springs (LIG-S) which is spontaneously produced via the pyrolytic jetting technique, is presented. Similar to wood or metal shavings observed in traditional machining processes, a pair of LIG-S with two opposite chiralities and controllable macroscopic dimensions is produced by a single scanning of a focused continuous-wave (CW) laser on a polyimide (PI) substrate. The resulting LIG-S, plastic shavings by laser, exhibits sufficient mechanical and electrical properties to enable many applications including strain-tolerant spring electrodes, antennas, supercapacitors, gas sensors, and luminescent filaments under extreme conditions. Without using any conventional fabrication techniques or other labor-intensive, time-consuming, and expensive processes, this novel approach enables a high-throughput mass production of macro-, micro-, and nanoscale featured LIG-S that can be manufactured within seconds to realize many open opportunities in all-carbon electromechanical systems. © 2023 The Authors. Advanced Science published by Wiley-VCH GmbH.

关键词： Fabrication

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NIG-AP: a new method for automated penetration testing

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Frontiers of Information technology & Electronic engineering 2019年第9期20卷 1277-1288页

作者： Tian-yang ZHOU Yi-chao ZANG Jun-hu ZHU Qing-xian WANG State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou 450001China China National Digital Switching System Engineering and Technological R&D Center Zhengzhou 450001China

Penetration testing offers strong advantages in the discovery of hidden vulnerabilities in a network and assessing network ***,it can be carried out by only security analysts,which costs considerable time and *** natural way to deal with the above problem is automated penetration testing,the essential part of which is automated attack *** previous studies have explored various ways to discover attack paths,all of them require perfect network information beforehand,which is contradictory to realistic penetration testing *** vividly mimic intruders to find all possible attack paths hidden in a network from the perspective of hackers,we propose a network information gain based automated attack planning(NIG-AP)algorithm to achieve autonomous attack path *** algorithm formalizes penetration testing as a Markov decision process and uses network information to obtain the reward,which guides an agent to choose the best response actions to discover hidden attack paths from the intruder’s *** results reveal that the proposed algorithm demonstrates substantial improvement in training time and effectiveness when mining attack paths.

关键词： Penetration testing reinforcement learning Classical planning Partially observable Markov decision process

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Unsupervised Facial Image Occlusion detection with deep Autoencoder

Unsupervised Facial Image Occlusion Detection with Deep Auto...

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2019第十一届数字图像处理国际会议

作者： Wang Xu-dong Wei Hong-quan Li Shao-mei Gao Chao Huang rui-yang National Digital Switching System Engineering & Technological R&D Center

Face recognition techniques have been developed significantly in recent ***,recognizing faces with partial occlusion is still a challenging *** there are many works to solve the problem of obscuring the face,the occlusion is still a challenge in face *** overcome this issue,firstly we should detect the occlusion position in the facial *** construct a robust self-encoding machine to solve the occlusion detection problem in face images and uses synthetic occlusion data for *** evaluated our method under various synthetic occlusion face *** show that our method can effectively detect various types of occlusion masks in an unsupervised manner and has better robustness to the occlusion categories.

关键词： Face recognition Occlusion detection deep Autoencoder

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A direct position determination method with combined TdOA and FdOA based on particle filter

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Chinese Journal of Aeronautics 2018年第1期31卷 161-168页

作者： Zhiyu LU Bin BA Jianhui WANG Wenchao LI daming WANG China National Digital Switching System Engineering & Technological R&D Cente Zhengzhou 450000 China Jiuquan Satellite Launch Center Jiuquan 735000 China

The localization of a stationary transmitter using moving receivers is considered. The original direct Position determination （dPd） methods, with combined Time difference of Arrival （TdOA） and Frequency difference of Arrival （FdOA）, do not perform well under low Signal-to-Noise ratio （SNr）, and worse still, the computation cost is difficult to accept when the computational capabilities are limited. To get better positioning performance, we present a new dPd algorithm that proves to be more computationally efficient and more precise for weak signals than the conventional approach. The algorithm partitions the signal received with the same receiver into multiple non-overlapping short-time signal segments, and then uses the TdOA, the FdOA and the coherency among the short-time signals to locate the target. The fast maximum likelihood estimation, one iterative method based on particle filter, is designed to solve the problem of high computation load. A secondary but important result is a derivation of closed-form expressions of the Cramer-rao Lower Bound （CrLB）. The simulation results show that the algorithm proposed in this paper outperforms the traditional dPd algorithms with more accurate results and higher computational efficiency, and especially at low SNr, it is more close to the CrLB.

关键词： direct position determination Cramer-rao lower bound Frequency difference of arrival Time difference of arrival Particle filter

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Security for cyberspace:challenges and opportunities

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Frontiers of Information technology & Electronic engineering 2018年第12期19卷 1459-1461页

作者： Jiang-xing WU Jian-hua LI Xin-sheng JI National Digital Switching System Engineering & Technological R&D Center School of Cyber Security Shanghai Jiao Tong University

Nowadays,cyberspace has become the "fifth frontier"after the ocean,land,air,and *** the globalization of information,cyberspace has never faced so many challenges,such as principle innovation,theory innovation,technology innovation,and application ***,the transition from traditional cyberspace to new cyberspace is inevitable. In the future,cyberspace will have many important characteristics,such as openness,heterogeneity,mobility,dynamism,and security.

关键词： Security for cyberspace Sea land air space

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Study on the Tensile and Bonding Properties between Cement-Based Grout Material and High-Strength Bolt

SSRN

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SSrN 2023年

作者： Liu, Peng Zhi, Weiting Mao, Jianfeng Liu, Lei Chen, Ying Yu, Zhiwu He, Sasa Zhang, Ning Hu, Cheng School of Civil Engineering Central South University 22 Shaoshan Road Changsha410075 China National Engineering Research Center for High Speed Railway Construction Changsha410075 China School of Civil Engineering Central South University of Forestry and Technology 498 Shaoshan Road Changsha410004 China School of Physical and Technology YiLi Normal University 448 Jiefang West Road Yining835000 China Central South University China Hunan Aircraft Landing System Technology R&D Co. Ltd. 29 Qingzhuhu Road Changsha410153 China

This study investigated the tensile and bonding properties between cement-based grouting materials (CBGM) and high-strength bolts. The associated failure mechanism, load-slip curve, ultimate pull-out load and bond stress were also studied. The effects of anchorage length and square steel tube restraint on the bonding properties were explored on the basis of 24 specimens central pull-out testing, and a bond stress-slip constitutive relationship model between high-strength bolts and CBGM was proposed. The results indicate that with the increase of the anchorage length of high-strength bolts, the failure mode of specimens can be divided into three types: the fracture failure of high-strength bolt was occurred with the anchorage lengths ranging from 18 d to 31 d;when the anchorage length was less than 15 d, the specimen occurred splitting failure with the constraint of square steel tube, and the high-strength bolt occurred pull-out failure without the constraint of square steel tube. When the high-strength bolt occurred the tensile failure, the ultimate pull-out load remains a constant and the bond stress decreases as the increase of the anchorage length of high-strength bolt. due to the lateral constrained effect of the square steel tube, the CBGM embodies a three-dimensional stress state, which can delay the generation and development of the internal cracks, and enhance the bond strength. A calculation formula was proposed to determine the bond strength between high-strength bolt and CBGM, and a constitutive model of the bond stress-slip constitutive relationship was also modeled. © 2023, The Authors. All rights reserved.

关键词： Mortar

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