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Spectrum-Efficient User Association in Caching Enabled Dense Small Cell Network

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China Communications 2023年第3期20卷 86-104页

作者： Junyu Liu Min Sheng Xiaona zhao Shuang Ni Jiandong Li State Key Laboratory of ISN Xidian UniversityXi’an 710071China Department of Broadband Communication Peng Cheng LaboratoryShenzhen 518055China

In this paper,we reveal the fundamental limitation of network densification on the performance of caching enabled small cell network(CSCN)under two typical user association rules,namely,contentand distance-based *** indicates that immoderately caching content would significantly change the interference distribution in CSCN,which may degrade the network area spectral efficiency(ASE).Meanwhile,it is shown that content-based rule outperforms the distance-based rule in terms of network ASE only when small cell base stations(BSs)are sparsely deployed with low decoding ***,it is proved that network ASE under distance-based user association serves as the upper bound of that under content-based rule in dense BS *** enable more spectrum-efficient user association in dense CSCN,we further optimize network ASE by designing a probabilistic content retrieving strategy based on distance-based *** the optimized retrieving probability,network ASE could be substantially enhanced and even increase with the growing BS density in dense BS regime.

关键词： caching dense network user association

Cenozoic Denudation and Vertical Faulting History of the Central Segment of the Longmenshan Thrust Belt

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Acta Geologica Sinica(English Edition) 2016年第4期90卷 1541-1542页

作者： TAN Xibin XU Xiwei LEE Yuanhsi KANG Wenjun zhao Shiliang Key Laboratory of Active Fault and Volcano Institute of GeologyChina Earthquake Administration Department of Earth and Environmental Sciences National Chung-Cheng University

Objective The uplift process and uplift mechanism of the Tibetan Plateau has been a research focus among geologists in recent years. This work put emphasis on the Cenozoic exhumation histories of the blocks bounded by the major faults at the central segment of the Longmenshan thrust belt, and the vertical faulting history, including the starting time and the total vertical displacement, of the major faults. Then we quantitatively established a complete active process for the central segment of the Longmenshan thrust belt, combining with the previous geophysical data in the deep and geologcial data. This study is critical for deeply and completely understanding the Cenozoic uplift history of the Longmenshan, and also provides thermochronology constraints to the different models for the uplift of the eastern margin of the Tibetan Plateau.

关键词： Cenozoic Denudation and Vertical Faulting History of the Central Segment of the Longmenshan Thrust Belt

IMPULP:A Hardware Approach for In-Process Memory Protection via User-Level Partitioning

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Journal of Computer Science & Technology 2020年第2期35卷 418-432页

作者： Yang-Yang zhao Ming-Yu Chen Yu-Hang Liu Zong-Hao Yang Xiao-Jing Zhu Zong-Hui Hong Yun-Ge Guo State Key Laboratory of Computer Architecture Institute of Computing TechnologyChinese Academy of Sciences Beijing 100190China University of Chinese Academy of Sciences Beijing 100049China Peng cheng Laboratory Shenzhen 518055China

In recent years many security attacks occur when malicious codes abuse in-process memory *** to the increasing complexity,an application program may call third-party code which cannot be controlled by programmers but may contain security *** a result,the users have the risk of suffering information leakage and control flow ***,current solutions like Intel memory protection extensions(MPX)severely degrade performance,while other approaches like Intel memory protection keys(MPK)lack flexibility in dividing security *** this paper,we propose IMPULP,an effective and efficient hardware approach for in-process memory *** rationale of IMPULP is user-level partitioning that user code segments are divided into different security domains according to their instruction addresses,and accessible memory spaces are specified dynamically for each domain via a set of boundary *** instruction related to memory access will be checked according to its security domain and the corresponding boundaries,and illegal in-process memory access of untrusted code segments will be *** can be leveraged to prevent a wide range of in-process memory abuse attacks,such as buffer overflows and memory *** verification,an FPGA prototype based on RISC-V instruction set architecture has been *** present eight tests to verify the effectiveness of IMPULP,including five memory protection function tests,a test to defense typical buffer overflow,a test to defense famous memory leakage attack named Heartbleed,and a test for security *** execute the SPEC CPU2006 benchmark programs to evaluate the efficiency of *** performance overhead of IMPULP is less than 0.2%runtime on average,which is ***,the resource overhead is less than 5.5%for hardware modification of IMPULP.

关键词： in-process isolation memory protection out-of-bounds user-level partitioning

Application of topical gentamicin-a new era in the treatment of genodermatosis

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World Journal of Pediatrics 2021年第6期17卷 568-575页

作者： Shan Wang Zhou Yang Ying Liu Mu-Tong zhao Juan zhao Huan Zhang Zong-Yang Liu Xiao-Ling Wang Lin Ma Yong-Hong Yang Department of Dermatology Beijing Children's HospitalCapital Medical UniversityNational Center for Children's HealthNo.56 South Li Shi RoadXi Cheng DistrictBeijing 100045China Department of Pharmacy.Beijing Children's Hospital Capital Medical UniversityNational Center for Children's HealthNo.56 South Li Shi RoadXi Cheng DistrictBeijing 100045China China National Clinical Research Center for Respiratory Diseases Department of Respiratory MedicineBeijing Children's HospitalCapital Medical UniversityNational Center for Children’s HealthNo.56 South Li Shi RoadXi Cheng DistrictBeijing 100045China

Background The clinical use of gentamicin always lies in its antimicrobial activity in the past as an aminoglycoside ***,in the past decade,there were considerable interests in therapeutic approaches in treating hereditary *** of the genodermatosis is caused by nonsense mutations that create premature termination codons and lead to the production of truncated or non-functional *** could induce readthrough of nonsense mutations and enable the synthesis of full-length *** focus on previous publications on topical application of gentamicin and review its utility in genetic skin *** sources We search the MEDLINE through PubMed,EMBASE databases,and the Clinical Trials Registry Platform from January 1960 to July 2020 using the key search terms"gentamicin,topical gentamicin,genodermatosis,genetic skin diseases".Results The application of gentamicin in genodermatosis yielded promising results,both in vivo and in vitro,including Nagashima-type palmoplantar keratosis,epidermolysis bullosa,Hailey-Hailey disease,hereditary hypotrichosis simplex of the scalp,*** Topical gentamicin is a potential treatment option for genodermatosis caused by nonsense mutation.

关键词： Epidermolysis bullosa Gentamicin Nagashima-type palmoplantar keratosis Nonsense mutation Readthrough

Return just your search:privacy-preserving homoglyph search for arbitrary languages

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Frontiers of Computer Science 2022年第2期16卷 140-151页

作者： Bowen zhao Shaohua TANG Ximeng LIU Yiming WU School of Computer Science and Engineering South China University of TechnologyGuangzhou 510006China Zheng Zhiming Lab Peng Cheng LaboratoryShenzhen 518055China College of Mathematics and Computer Science Fuzhou UniversityFuzhou 350108China

Searchable encryption is an effective way to ensure the security and availability of encrypted outsourced cloud *** existing solutions,the keyword exact search solution is relatively inflexible,while the fuzzy keyword search solution either has a high index overhead or suffers from the ***,no existing fuzzy keyword search solution considers the homoglyph search on encrypted *** this paper,we propose an efficient privacy-preserving homoglyph search scheme supporting arbitrary languages(POSA,in short).We enhance the performance of the fuzzy keyword search in three ***,we formulate the similarity of homoglyph and propose a privacy-preserving homoglyph ***,we put forward an index build mechanism without the false-positive,which reduces the storage overhead of the index and is suitable for arbitrary ***,POSA returns just the user’s search,i.e.,all returned documents contain the search keyword or its *** theoretical analysis and experimental evaluations on real-world datasets demonstrate the effectiveness and efficiency of POSA.

关键词： searchable encryption cloud storage fuzzy search privacy preservation arbitrary languages

Biomarker assessments of sources and environmental implications of organic matter in sediments from potential cold seep areas of the northeastern South China Sea

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Acta Oceanologica Sinica 2017年第10期36卷 8-19页

作者： DING Ling zhao Meixun YU Meng LI Li HUANG Chi-Yue Key Laboratory of Marine Chemistry Theory and Technology (Ocean University of China) Ministry of Education Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology Ministry of Land and Resources Department of Earth Sciences National Cheng Kung University

Multi-biomarker indexes were analyzed for two piston cores from potential cold seep areas of the South China Sea off southwestern Taiwan. Total organic carbon（TOC） normalized terrestrial（n-alkanes） and marine（brassicasterol, dinosterol, alkenones and iso-GDGTs） biomarker contents and ratios（TMBR, 1/Pmar-aq, BIT） were used to evaluate the contributions of terrestrial and marine organic matter（TOM and MOM respectively） to the sedimentary organic matter, indicating that MOM dominated the organic sources in Core MD052911 and the sedimentary organic matter in Core ORI-_（86）0-22 was mainly derived from terrestrial inputs, and different morphologies were the likely reason for TOM percentage differences. BIT results suggested that river-transported terrestrial soil organic matter was not a major source of TOM of sedimentary organic matter around these *** biomarkers for methane-oxidizing archaea（MOA） were only detected in one sample at 172 cm depth of Core ORI-_（86）0-22, with abnormally high iso-GDGTs content and Methane Index（MI） value（0.94）. These results indicated high anaerobic oxidation of methane（AOM） activities at or around 172 cm in Core ORI-_（86）*** in Core MD052911, MOA biomarkers were not detected and MI values were lower（0.19–0.38）, indicated insignificant contributions of iso-GDGTs from methanotrophic archaea and the absence of significant AOM activities. Biomarker results thus indicated that the discontinuous upward methane seepage and insufficient methane flux could not induce high AOM activities in our sampling sites. In addition, the different patterns of TEX_（86） and U_（37）^（K′） temperature in two cores suggested that AOM activities affected TEX_（86）37 temperature estimates with lower values in Core ORI-_（86）0-22, but not significantly on TEX_（86） temperature estimates in Core MD052911.

关键词： biomarkers organic matter sources TOM MOM anaerobic oxidation of methane South China Sea

A verifiable privacy-preserving data collection scheme supporting multi-party computation in fog-based smart grid

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Frontiers of Computer Science 2022年第1期16卷 143-153页

作者： Zhusen LIU Zhenfu CAO Xiaolei DONG Xiaopeng zhao Haiyong BAO Jiachen SHEN Shanghai Key Laboratory of Trustworthy Computing East China Normal UniversityShanghai200062China Cyberspace Security Research Center Peng Cheng LaboratoryShenzhen518055China School of Computer Science and Information Engineering Zhejiang Gongshang UniversityHangzhou310018China

Incorporation of fog computing with low latency,preprocession(e.g.,data aggregation)and location awareness,can facilitate fine-grained collection of smart metering data in smart grid and promotes the sustainability and efficiency of the ***,much attention has been paid to the research on smart grid,especially in protecting privacy and data ***,most previous works do not focus on privacy-preserving data aggregation and function computation query on enormous data simultaneously in smart grid based on fog *** this paper,we construct a novel verifiable privacy-preserving data collection scheme supporting multi-party computation(MPC),named VPDC-MPC,to achieve both functions simultaneously in smart grid based on fog ***-MPC realizes verifiable secret sharing of users’data and data aggregation without revealing individual reports via practical cryptosystem and verifiable secret sharing ***,we propose an efficient algorithm for batch verification of share consistency and detection of error reports if the external adversaries modify the SMs’***,VPDC-MPC allows both the control center and users with limited resources to obtain arbitrary arithmetic analysis(not only data aggregation)via secure multi-party computation between cloud servers in smart ***,VPDC-MPC tolerates fault of cloud servers and resists *** also present security analysis and performance evaluation of our scheme,which indicates that even with tradeoff on computation and communication overhead,VPDC-MPC is practical with above features.

关键词： smart grid fog computing data aggregation verifiable secret sharing error detection secure multi-party computation secure function query privacy-preserving

The South China Sea is not a mini-Atlantic: plate-edge rifting vs intra-plate rifting

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National Science Review 2019年第5期6卷 902-913页

作者： Pinxian Wang Chi-Yue Huang Jian Lin Zhimin Jian Zhen Sun Minghui zhao State Key Laboratory of Marine Geology Tongji University Department of Earth Sciences Cheng Kung University Department of Geology and Geophysics Woods Hole Oceanographic Institution Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of Oceanology Chinese Academy of Sciences

The South China Sea, as ‘a non-volcanic passive margin basin’ in the Pacific, has often been considered as a small-scale analogue of the *** recent ocean drilling in the northern South China Sea margin found, however, that the Iberian model of non-volcanic rifted margin from the Atlantic does not apply to the South China *** this paper, we review a variety of rifted basins and propose to discriminate two types of rifting basins: plate-edge type such as the South China Sea and intra-plate type like the *** not only differ from each other in structure, formation process, lifespan and geographic size, but also occur at different stages of the Wilson *** intra-plate rifting occurred in the Mesozoic and gave rise to large oceans, whereas the plate-edge rifting took place mainly in the mid-Cenozoic, with three-quarters of the basins concentrated in the Western *** a member of the Western Pacific system of marginal seas, the South China Sea should be studied not in isolation on its origin and evolution, but in a systematic context to include also its neighboring counterparts.

关键词： rifting marginal basin passive margin South China Sea Western Pacific subduction

Effects of virtual environment and self-representations on perception and physical performance in redirected jumping

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Virtual Reality & Intelligent Hardware 2021年第6期3卷 451-469页

作者： Yijun LI Miao WANG Derong JIN Frank STEINICKE Qinping zhao State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and EngineeringBeihang UniversityBeijing 100083China Peng cheng Laboratory Shenzhen 518055China Universiẗat Hamburg Hamburg 21071Germany

Background Redirected jumping(RDJ)allows users to explore virtual environments(VEs)naturally by scaling a small real-world jump to a larger virtual jump with virtual camera motion manipulation,thereby addressing the problem of limited physical space in VR *** RDJ studies have mainly focused on detection threshold ***,the effect VE or self representation(SR)has on the perception or performance of RDJs remains *** In this paper,we report experiments to measure the perception(detection thresholds for gains,presence,embodiment,intrinsic motivation,and cybersickness)and physical performance(heart rate intensity,preparation time,and actual jumping distance)of redirected forward jumping under six different combinations of VE(low and high visual richness)and SRs(invisible,shoes,and human-like).Results Our results indicated that the detection threshold ranges for horizontal translation gains were significantly smaller in the VE with high rather than low visual *** different SRs were applied,our results did not suggest significant differences in detection thresholds,but it did report longer actual jumping distances in the invisible body case compared with the other two *** the high visual richness VE,the preparation time for jumping with a human-like avatar was significantly longer than that with other ***,some correlations were found between perception and physical performance *** All these findings suggest that both VE and SRs influence users'perception and performance in RDJ and must be considered when designing locomotion techniques.

关键词： Virtual reality Virtual locomotion Redirected jumping