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A buffer overflow detection and defense method based on RiSC-V instruction set extension

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Cybersecurity 2024年第2期7卷 28-43页

作者： chang Liu Yan-Jun Wu Jing-zheng Wu Chen Zhao Intelligent Software Research Center Institute of SoftwareChinese Academy of SciencesBejingChina University of Chinese Academy of Sciences BeijingChina State Key Laboratory of Computer Science Institute of SoftwareChinese Academy of SciencesBeijingChina

Buffer overflow poses a serious threat to the memory security of modern operating *** overwrites the con-tents of other memory areas by breaking through the buffer capacity limit,destroys the system execution environ-ment,and provides implementation space for various system attacks such as program control flow *** makes it a wide range of harms.A variety of security technologies have been proposed to deal with system security problems including buffer *** example,No eXecute(NX for short)is a memory management technology commonly used in Harvard *** can refuse the execution of code which residing in a specific memory,and can effectively suppress the abnormal impact of buffer overflow on control ***,in recent years,it has also been used in the field of system security,deriving a series of solutions based on NX technology,such as ExecShield,DEP,StackGuard,***,these security solutions often rely too much on the processor archi-tecture so that the protection coverage is insufficient and the accuracy is *** in the emerging system architecture field represented by RiSC-V,there is still a lack of effective solutions for buffer overflow *** the continuous rapid development of the system architecture,it is urgent to develop defense methods that are applicable to different system application environments and oriented to all executable memory spaces to meet the needs of system security ***,we propose BOP,A new system memory security design method based on RISC-V extended instructions,to build a RISC-V buffer overflow detection and defense system and deal with the buffer overflow threat in *** to this method,NX technology can be combined with program control flow analysis,and Nx bit mechanism can be used to manage the executability of memory space,so as to achieve a more granular detection and defense of buffer overflow attacks that may occur in RISC-V system

关键词： RISc-V Operating system security Buffer overflow Control flow hijacking Nx bit Xibop

On the Quantum Cohomology of Blow-ups of Four-dimensional Quadrics

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Acta Mathematica Sinica,English Series 2024年第1期40卷 313-328页

作者： Jian Xun HU Hua Zhong KE chang zheng LI Lei SONG School of Mathematics Sun Yat-sen UniversityGuangzhou 510275P.R.China

We propose a conjecture relevant to Galkin’s lower bound conjecture,and verify it for the blow-ups of a four-dimensional quadric at a point or along a projective *** also show that Conjecture O holds in these two cases.

关键词： Quantum cohomology blow-up quadric hypersurface

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World Journal of Gastroenterology 2024年第9期30卷 1224-1236页

作者： Hai-Yang Li Lin-Lin zheng Nan Hu Zhi-Hao Wang chang-Cheng Tao Ya-ru Wang Yue Liu Zulihumaer Aizimuaji Hong-Wei Wang rui-Qi zheng Ting Xiao Wei-Qi Rong Department of Hepatobiliary Surgery National Cancer Center/National Clinical Research Center for Cancer/Cancer HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100021China Department of Hepatobiliary Hernia Surgery Liaocheng Dongcangfu People’s HospitalLiaocheng 252000Shandong ProvinceChina State Key Laboratory of Molecular Oncology Department of Etiology and CarcinogenesisNational Cancer Center/National Clinical Research Center for Cancer/Cancer HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100021China

BACKGROUND As a critical early event in hepatocellular carcinogenesis,telomerase activation might be a promising and critical biomarker for hepatocellular carcinoma(HCC)patients,and its function in the genesis and treatment of HCC has gained much attention over the past two *** To perform a bibliometric analysis to systematically assess the current state of research on HCC-related *** The Web of Science Core Collection and PubMed were systematically searched to retrieve publications pertaining to HCC/telomerase limited to“articles”and“reviews”published in English.A total of 873 relevant publications related to HCC and telomerase were *** employed the Bibliometrix package in R to extract and analyze the fundamental information of the publications,such as the trends in the publications,citation counts,most prolific or influential writers,and most popular journals;to screen for keywords occurring at high frequency;and to draw collaboration and cluster analysis charts on the basis of coauthorship and *** was utilized to compile and visualize the bibliometric *** A surge of 51 publications on HCC/telomerase research occurred in 2016,the most productive year from 1996 to 2023,accompanied by the peak citation count recorded in *** to December 2023,35226 citations were made to all publications,an average of 46.6 citations to each *** United States received the most citations(n=13531),followed by China(n=7427)and Japan(n=5754).In terms of national cooperation,China presented the highest centrality,its strongest bonds being to the United States and *** the 20 academic institutions with the most publications,ten came from China and the rest of Asia,though the University of Paris Cité,Public Assistance-Hospitals of Paris,and the National Institute of Health and Medical Research(INSERM)were the most *** for individual contributions,Hisatomi H,Kaneko S,and Ide T were the three most prolific a

关键词： Telomerase Bibliometric analysis Telomerase reverse transcriptase Prognosis Treatment Hepatocellular carcinoma

Eco-friendly calcium alginate microspheres enable enhanced profile control and oil displacement

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Petroleum Science 2024年第3期21卷 1928-1943页

作者： Xiao-Han Zhang chang-Jing Zhou Yuan-Xiang Xiao Bo Hui Yong-Gang Xie Yu-Bin Su Xin-ru Li Jie Huang Mao-chang Liu International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi'an Jiaotong UniversityXi'an710049ShaanxiPR.China Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil&Gas Reservoirs School of Petroleum EngineeringXi'an Shiyou UniversityXi'an 710065ShaanxiPR.China Oil&Gas Technology Research Institute Changqing Oilfield Branch CompanyPetroChinaXi'an710021ShaanxiPR China Suzhou Academy of Xi'an Jiaotong University Suzhou215123JiangsuPR China

Polymer microspheres(PMs),such as polyacrylamide,have been widely applied for enhanced oil recovery(EOR),yet with environmental ***,we report a microfluid displacement technology containing a bio-based eco-friendly material,i.e.,calcium alginate(CaAlg)microspheres for *** dominant mechanisms responsible for EOR over Ca Alg fluid have been verified,including the microscopic oil displacement efficacy augmented by regulating capillary force(determined by the joint action of interfacial tension and wettability between different phases)and macroscopic sweep volume increment through profile control and mobility ratio *** comprehensive effectiveness can be further impacted when the CaAlg microsphere is embellished ulteriorly by using appropriate amount of sodium dodecyl sulfonate(SDS).The core flooding and nuclear magnetic resonance(NMR)tests demonstrate that CaAlg-SDS microsphere can balance the interphase property regulation(wettability alteration and IFT reduction)and rheology properties,enabling simultaneous profile control and oil *** introduction of SDS will have a negative impact on rheological properties,which is not favored for *** results show that the involvement of 4-m M SDS will provide the best behavior,with an EOR rate of 34.38%.This cost-effective and environmentally-friendly bio-microspherebased microfluidic displacement technology is expected to achieve“green”oil recovery in future oilfield exploitation.

关键词： Calcium alginate microspheres Wettability Interfacial tension Rheology Viscoelasticity Enhanced oil recovery(EOR)

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A lateral AlGaN/GaN Schottky barrier diode with 0.36-V turn-on voltage and 10-kV breakdown voltage by using double-barrier anode structure

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Chip 2024年第1期3卷 35-42页

作者： ru Xu Peng Chen Xiancheng Liu Jianguo Zhao Tinggang Zhu Dunjun Chen Zili Xie Jiandong Ye Xiangqian Xiu Fayu Wan Jianhua chang Rong Zhang Youdou zheng The Key Laboratory of Advanced Photonic and Electronic Materials School of Electronic Science and EngineeringNanjing UniversityNanjing 210023China School of Electronic and Information Engineering Nanjing University of Information Science and TechnologyNanjing 210044China Corenergy Semiconductor Incorporation Suzhou 215600China

GaN power electronic devices,such as the lateral AlGaN/GaN Schottky barrier diode(SBD),have received significant attention in recent *** studies have focused on optimizing the breakdown voltage(BV)of the device,with a particular emphasis on achieving ultra-high-voltage(UHV,>10 kV)***,another important question arises:can the device maintain a BV of 10 kV while having a low turn-on voltage(V_(on))?In this study,the fabrication of UHV AlGaN/GaN SBDs was demonstrated on sapphire with a BV exceeding 10 ***,by utilizing a doublebarrier anode(DBA)structure consisting of platinum(Pt)and tantalum(Ta),a remarkably low Von of 0.36 V was *** achievement highlights the great potential of these devices for UHV applications.

关键词： AlGaN/GaN Schottky barrier diode Double-barrier anode Turn-on voltage Ultra-high-voltage

Incidence and Mortality of Cancers in Female Genital Organs—China,2022

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China CDC weekly 2024年第10期6卷 195-202,I0003,I0004页

作者： Kexin Sun Bingfeng Han Hongmei Zeng Shaoming Wang Li Li ru Chen Rongshou zheng Wenqiang Wei National Central Cancer Registry National Cancer Center/National Clinical Research Center for Cancer/Cancer HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijingChina

Introduction:This study presented the incidence and mortality rates of cancers affecting the female genital organs in China,along with their trends spanning from 2010 to ***:700 population-based cancer registries provided relevant cancer incidence and mortality data for the year *** these,106 registries had continuous monitoring data suitable for trend analysis from 2010 to *** focused specifically on cancers affecting female genital organs(ICD10=C51-C54,C56)and projected their incidences and mortalities in China for 2022 based on data from 2018 and the trends observed from 2010 to ***-standardized incidence rate(ASIR)and mortality rate(ASMR)were calculated using Segi’s world standard ***:In 2022,there were an estimated 296,300 new cases and 104,900 deaths from female cancers in *** for vulva(C51),vagina(C52),cervix uteri(C53),corpus uteri(C54),and ovary(C56)were 0.32,0.23,13.83,6.84,and 5.68 per 100,000 *** for corpus uteri and ovary cancers were higher in urban *** for vulva,vagina,cervix,corpus uteri,and ovary cancers were 0.14,0.08,4.54,1.05,and 2.64 per 100,000 population,*** for ovarian cancer was higher in urban *** and ASMRs for most female genital organ cancers increased from 2010 to 2018,although the rate of increase for vulvar and cervical cancers in rural areas has slowed ***:Tailored cancer prevention and control programs specific to each region are necessary to address the growing disease burden.

关键词： ICD10 mortality organs

Molecular mechanism of hypoxia and alpha-ketoglutaric acid on collagen expression in scleral fibroblasts

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International Journal of Ophthalmology(English edition) 2024年第10期17卷 1780-1790页

作者： Yun Sun Zhuo-zheng Li Jing Yang Ya-ru Sha Xin-Yu Hou Hong Fu Jia-Yin Li Shu-chang Bai Yong-Fang Xie Guo-Hui Wang School of Life Science and Technology Shandong Second Medical UniversityWeifang 261053Shandong ProvinceChina

AIM:To investigate the molecular mechanisms underlying the influence of hypoxia and alpha-ketoglutaric acid(α-KG)on scleral collagen ***:Meta-analysis and clinical statistics were used to prove the changes in choroidal thickness(ChT)during *** establishment of a hypoxic myopia model(HYP)for rabbit scleral fibroblasts through hypoxic culture and the effects of hypoxia andα-KG on collagen expression were demonstrated by Sirius red *** analysis was used to verify the genes and pathways that hypoxia andα-KG affect collagen ***,real-time quantitative reverse transcription polymerase chain reaction(RT-qPCR)was used for reverse ***:Meta-analysis results aligned with clinical statistics,revealing a thinning of ChT,leading to scleral *** red staining indicated lower collagen expression in the HYP group and higher collagen expression in the HYP+α-KG group,showed that hypoxia reduced collagen expression in scleral fibroblasts,whileα-KG can elevated collagen expression under HYP *** analysis unveiled the related genes and signaling pathways of hypoxia andα-KG affect scleral collagen expression and the results were verified by ***:The potential molecular mechanisms through which hypoxia andα-KG influencing myopia is unraveled and three novel genes TLCD4,TBC1D4,and EPHX3 are *** findings provide a new perspective on the prevention and treatment of myopia via regulating collagen expression.

关键词： sclera scleral collagen expression hypoxia alpha-ketoglutaric acid myopia

Design and construction of charged-particle telescope array for study of exotic nuclear clustering structure

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Nuclear Science and Techniques 2024年第8期35卷 114-123页

作者： zheng‑Li Liao Xi‑Guang Cao Yu‑Xuan Yang chang‑Bo Fu Xian‑Gai Deng Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China zhengzhou University Zhengzhou 450001China Key Laboratory of Nuclear Physics and Ion‑beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Shanghai Research Center for Theoretical Nuclear Physics NSFC and Fudan University Shanghai 200438China

The exploration of exotic shapes and properties of atomic nuclei,e.g.,αcluster and toroidal shape,is a fascinating field in nuclear *** study the decay of these nuclei,a novel detector aimed at detecting multipleα-particle events was designed and *** detector comprises two layers of double-sided silicon strip detectors(DSSD)and a cesium iodide scintillator array coupled with silicon photomultipliers array as light sensors,which has the advantages of their small size,fast response,and large dynamic *** coupled with cesium iodide crystal arrays are used to distinguish multipleα*** detector array has a compact and integrated design that can be adapted to different experimental *** detector array was simulated using Geant4,and the excitation energy spectra of someα-clustering nuclei were reconstructed to demonstrate the *** simulation results show that the detector array has excellent angular and energy resolutions,enabling effective reconstruction of the nuclear excited state by multipleαparticle *** detector offers a new and powerful tool for nuclear physics experiments and has the potential to discover interesting physical phenomena related to exotic nuclear structures and their decay mechanisms.

关键词： Cluster decay Toroidal structure Telescope array SiPM Energy resolution

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A novel UHMWPE composite with low friction coefficient for long-term ice sliding

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Friction 2024年第11期12卷 2480-2490页

作者： Yacong HOU Lei CHEN zheng ZHANG Jinlin chang Ding WENG Yuan MA Jiadao WANG State Key Laboratory of Tribology in Advanced Equipment School of Mechanical EngineeringTsinghua UniversityBeijing 100084China

Low friction ice sliding interfaces were critical for ski performance *** fluorinated ski waxes have attracted considerable attention for enhancing the hydrophobicity,anti-wearing,and oxidation resistance of ski–ice ***,the toxicity and complexity of the waxing process limited batch manufacturing of low-cost and non-toxic ski–ice base,what is more,the wax covering on the base wore and failed during skiing due to the friction between ski and ***,we demonstrated a novel ultra-high molecular weight polyethylene(UHMWPE)composite that could maintain a low coefficient of friction(COF)with about 0.026 for at least 160 min when skiing on the ***(MS)could release liquid(liquid paraffin(LP)).The released LP further enhanced the hydrophobicity of UHMWPE’s surfaces when friction occurred,which would maintain the stability and durability of the water film,and achieved superior and long-lasting friction *** with other microcapsules with lower hydrophobic core,microcapsules with LP performed the best in reducing the friction of ski base from 0.126 to ***,the COF of the surface kept at about 0.02 even after 12 rapid temperature *** presented UHMWPE composite of encapsulated liquids showed great potential and broad application owing to its simplicity and efficiency in winter sports.

关键词： microcapsule(MS) ice friction ski liquid paraffin self-lubrication water film