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A Taint Analysis Framework Applied to Android Applications in the Packed State

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China Communications 2023年第3期20卷 336-346页

作者： Shouying Bai Lu ma huan ma Wei Liu National Computer Network Emergency Response Technical Team/Coordination Center of China Beijing 100029China

In recent years,Android applications have caused personal privacy leaks *** order to analyze the malicious behavior,taint analysis technology can be used to track the API call chain,build a control-flow graph of function,and determine whether there is a security ***,with the continuous escalation of offensive and defensive confrontation of source code,more and more applications use reinforcement technology to prevent security practitioners from performing reverse analysis,therefore it is impossible to analyze function-behavior from the source ***,we design a framework of taint analysis that applied to the Android applications,which automatically unpacks the Android APKs,restores the real source code of the App,performs taint analysis,and generates a control-flow graph of *** tests showed that the system can cope with the current mainstream reinforcement technology and restore the real Dex file ***,compared with the number of nodes before packing,the generated control-flow graph had an explosive increase,which effectively assisted manual analysis of App with the privacy leakage behaviors.

关键词： privacy disclosure unpacked technology taint analysis

Soil water response to precipitation in different microtopographies on the semi-arid Loess Plateau,China

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Journal of Forestry Research 2020年第1期31卷 245-256页

作者： huan ma Qingke Zhu Weijun Zhao Forestry Ecological Engineering Research Center School of Soil and Water ConservationBeijing Forestry UniversityBeijing 100083People’s Republic of China Key Laboratory of Tourism and Resources Environment in Colleges and Universities of Shandong Province Taishan UniversityTaianShandong 271000People’s Republic of China

Soil water is an important factor restricting afforestation on the semi-arid Loess *** microtopography of the loess slope has changed the distribution pattern of soil water on the *** improve water utilization efficiency and optimize afforestation configuration patterns,the relationship between soil water and precipitation at micro-topographic scale must be *** used time series analysis to study the temporal variation of soil water and its response to precipitation in four kinds of micro-topographies and undisturbed slope on loess ***-topographies significantly influenced soil water distribution and dynamics on the *** water stored in the platform,sinkhole,and ephemeral gully influenced subsequent soil water for 4 weeks,whereas soil water stored in the scarp and undisturbed slope could influence soil water for 2 *** took 12 weeks,10 weeks,18 weeks,6 weeks,and 12 weeks for precipitation to reach the deeper soil layer in the platform,sinkhole,scarp,ephemeral gully,and undisturbed slope,*** soil water characteristics in different micro-topographies are vital factors that should be taken into consideration when undertaking afforestation on the Loess Plateau.

关键词： Semi-arid Loess Plateau Micro-topography Afforestation Time series analysis Soil water

Enhanced properties of stone coal-based composite phase change materials for thermal energy storage

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International Journal of Minerals,Metallurgy and materials 2024年第1期31卷 206-215页

作者： Baoshan Xie huan ma Chuanchang Li Jian Chen Key Laboratory of Renewable Energy Electric-Technology of Hunan Province School of Energy and Power EngineeringChangsha University of Science and TechnologyChangsha 410114China State Key Laboratory of Disaster Prevention and Reduction for Power Grid Changsha University of Science and TechnologyChangsha 410114China

Phase change materials (PCMs) can be incorporated with low-cost minerals to synthesize composites for thermal energy storage in building *** coal (SC) after vanadium extraction treatment shows potential for secondary utilization in composite *** prepared SC-based composite PCMs with SC as a matrix,stearic acid (SA) as a PCM,and expanded graphite (EG) as an *** combined roasting and acid leaching treatment of raw SC was conducted to understand the effect of vanadium extraction on promoting loading *** showed that the combined treatment of roasting at 900℃ and leaching increased the SC loading of the composite by 6.2%by improving the specific surface *** loading capacity and thermal conductivity of the composite obviously increased by 127%and 48.19%,respectively,due to the contribution of 3wt% *** data were supported by the high load of 66.69%and thermal conductivity of 0.59 W·m^(-1)·K-1of the designed *** obtained composite exhibited a phase change temperature of 52.17℃,melting latent heat of 121.5 J·g^(-1),and good chemical *** SC-based composite has prospects in building applications exploiting the secondary utilization of minerals.

关键词： thermal energy storage phase change material stone coal vanadium extraction secondary utilization

Experimental and Theoretical Study on the Self-Weight Penetration Velocity of Suction Anchor Foundations in Sand

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China Ocean Engineering 2023年第5期37卷 863-875页

作者： SUN Kai ma Hui-huan WANG Fu-ming School of Civil Engineering Sun Yat-Sen University&Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai 519082China Guangdong Key Laboratory of Oceanic Civil Engineering Guangzhou 510275China

The application of the wellhead suction anchor in the second production test of natural gas hydrates(NGHs)in the South China Sea(SCS)was met with *** design incorporates a central conductor guide pipe,which distinguishes it from traditional suction ***,this addition resulted in a relatively high penetration resistance and a shallower penetration depth at the self-weight penetration *** mitigate this issue,the current study proposes an optimized design where the end of the suction foundation is *** installation characteristics of the traditional suction foundation and new suction foundation during self-weight penetration into sand are studied through laboratory tests and theoretical *** flat and sharpened bottom shapes are considered in the traditional and new suction *** effects of the initial penetration velocity on the initial penetration depth and soil plug and impact cavity characteristics are systematically *** results show that the self-weight penetration depth of the foundation with a sharpened bottom is 44.5%deeper than that of the foundation with a flat *** are cavities around the foundation at the self-weight penetration stage,and the penetration depth is overestimated by 15%-30%.Finally,a model for predicting the penetration depth of the new suction foundation is proposed.

关键词： suction foundation self-weight penetration penetration velocity soil plug sharpened bottom

Wearable multilead ECG sensing systems using on-skin stretchable and breathable dry adhesives

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Bio-Design and manufacturing 2024年第2期7卷 167-180页

作者： Yingxi Xie Longsheng Lu Wentao Wang huan ma School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou 510641China College of Automotive and Mechanical Engineering Changsha University of Science and TechnologyChangsha 410114China Guangdong Cardiovascular Institute Guangdong Provincial People’s HospitalGuangzhou 510080China

Electrocardiogram(ECG)monitoring is used to diagnose cardiovascular diseases,for which wearable electronics have attracted much attention due to their lightweight,comfort,and long-term *** study developed a wearablemultilead ECG sensing system with on-skin stretchable and conductive silver(Ag)-coated fiber/silicone(AgCF-S)dry *** and normal adhesion to pigskin(0.43 and 0.20 N/cm2,respectively)was optimized by the active control of fiber density and mixing ratio,resulting in close contact in the electrode–skin *** breathableAgCF-S dry electrodewas nonallergenic after continuous fit for 24 h and can be reused/cleaned(>100 times)without loss of *** AgCF encapsulated inside silicone elastomers was overlapped to construct a dynamic network under repeated stretching(10%strain)and bending(90°)deformations,enabling small intrinsic impedance(0.3,0.1 Hz)and contact impedance variation(0.7 k)in high-frequency vibration(70 Hz).All hard/soft modules of the multilead ECG system were integrated into lightweight clothing and equipped with wireless transmission for signal *** synchronous acquisition of I–III,aVR,aVL,aVF,and V4 lead data,the multilead ECG sensing system was suitable for various scenarios,such as exercise,rest,and sleep,with extremely high signal-to-noise ratios.

关键词： Multilead electrocardiogram Dry electrodes Wearable electronics Wireless transmission

Multi-Lever EarlyWarning forWind and Photovoltaic Power Ramp Events Based on Neural Network and Fuzzy Logic

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Energy Engineering 2024年第11期121卷 3133-3160页

作者： huan ma Linlin ma Zengwei Wang Zhendong Li Yuanzhen Zhu Yutian Liu Power Grid Technology Center State Grid Shandong Electric Power Research InstituteJinan250003China Shandong Electric Power Dispatching and Control Center State Grid Shandong Electric Power CompanyJinan250012China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong UniversityJinan250061China

With the increasing penetration of renewable energy in power system,renewable energy power ramp events(REPREs),dominated by wind power and photovoltaic power,pose significant threats to the secure and stable operation of power *** paper presents an early warning method for REPREs based on long short-term memory(LSTM)network and fuzzy ***,the warning levels of REPREs are defined by assessing the control costs of various power control ***,the next 4-h power support capability of external grid is estimated by a tie line power predictionmodel,which is constructed based on the ***,considering the risk attitudes of dispatchers,fuzzy rules are employed to address the boundary value attribution of the early warning interval,improving the rationality of power ramp event early *** results demonstrate that the proposed method can generate reasonable early warning levels for REPREs,guiding decision-making for control strategy.

关键词： Early warning machine learning power system security renewable energy power ramp event smart grid

Anaerobic biodegradation,physical and structural properties of normal and high-amylose maize starch films

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International Journal of Agricultural and Biological Engineering 2016年第5期9卷 184-193页

作者： Liu Weiwei Xue Juan Cheng Beijiu Zhu Suwen ma Qing ma huan School of Engineering Anhui Agricultural UniversityHefei 230036China School of Life Sciences Anhui Agricultural UniversityHefei 230036China Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China

Biodegradable plastics have attracted considerable attention in recent years due to their biodegradability,biocompatibility and *** this study,normal maize starch(containing 25%amylose)and high-amylose maize starch(containing 80%amylose)were served as model materials to prepare starch/polyvinyl alcohol(PVA)*** comprehensively study the effects of amylose contents on the film performances,the mechanical properties,water resistance and anaerobic biodegradability of the two films were ***,the processes of anaerobic degradation were investigated by evolutions of biogas production,pH in reactors and the changes of film structures and *** results indicated that amylose content played an important role in the microstructures of starch film as well as mechanical properties and water resistance,whereas it had no significant influence on anaerobic biodegradability of the ***,the structure of high-amylose maize starch/PVA film was more suitable and beneficial to the anaerobic biodegradation than that of the normal maize starch/PVA film,because it could effectively avoid accumulation of volatile fatty acids,which contributed to the stable biogas production,short fermentation period and non-souring in the reactor.

关键词： maize starch film anaerobic biodegradation polyvinyl alcohol(PVA) amylose content biopolymer

Bayes-Based ARP Attack Detection Algorithm for Cloud Centers

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Tsinghua Science and Technology 2016年第1期21卷 17-28页

作者： huan ma Hao Ding Yang Yang Zhenqiang Mi James Yifei Yang Zenggang Xiong School of Computer and Communication Engineering University of Science and Technology Beijing Department of Electronics and Communication Engineering University of Illinois at Urbana-Champaign School of Computer and Information Science Hubei Engineering University

To address the issue of internal network security, Software-Defined Network（SDN） technology has been introduced to large-scale cloud centers because it not only improves network performance but also deals with network attacks. To prevent man-in-the-middle and denial of service attacks caused by an address resolution protocol bug in an SDN-based cloud center, this study proposed a Bayes-based algorithm to calculate the probability of a host being an attacker and further presented a detection model based on the algorithm. Experiments were conducted to validate this method.

关键词： cloud computing Bayes ARP attack detection software-defined network

magnetic resonance cholangiopancreatography for the detection of pancreatic duct stones in patients with chronic pancreatitis

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World Journal of Gastroenterology 2009年第20期15卷 2543-2546页

作者： Zhen-Hua ma Qing-Yong ma huan-Chen Sha Sheng-Li Wu Jun Wen Department of Hepatobiliary Surgery the First Affiliated Hospital Medical School of Xi'an Jiaotong University Xi'an 710061 Shaanxi Province China

AIM:To assess the role of magnetic resonance cholangiopancreatography(MRCP) in detection of pancreatic duct stones(PDS) in patients with chronic pancreatitis(CP).METHODS:Clinical data of 78 CP patients who were treated at the First Affi liated Hospital of Xi'an Jiaotong University(China) between January 2004 and July 2008 were retrospectively analyzed.A predictive model of pancreatic duct stones was established through logistic regression and its effectiveness was verifi *** these patients, MRCP was performed in 60 patients who served as a control group, while 44 patients with a higher predictive value than the entry threshold of the predictive model served as an experimental ***:The positive rate of PDS in the 78 patients with CP was 19.2%(15/78).The predictive entry threshold of the predictive model was 5%(P < 0.05).The possibility of existence of PDS could be predicted according to the following 4 indexes:gastrointestinal symptoms, intermittent abdominal pain, diabetes mellitus(DM)/impaired glucose tolerance(IGT) and positive B-mode ultrasound *** incidence of PDS in the experimental group was higher than that in the control group(P < 0.05).CONCLUSION:MRCP is strongly suggested for the detection of PDS in patients with gastrointestinal symptoms, intermittent abdominal pain, DM/IGT and positive B-mode ultrasound results.

关键词： Chronic pancreatitis Pancreatic duct stone magnetic resonance cholangiopancreatography B-mode ultrasound Logistic regression