检索结果-南通市图书馆

Trajectory Big Data Processing Based on Frequent Activity

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2019年第3期24卷 317-332页

作者： amina Belhassena Hongzhi Wang School of Computer Science and Technology Harbin Institute of Technology

With the rapid development and wide use of Global Positioning System in technology tools, such as smart phones and touch pads, many people share their personal experience through their trajectories while visiting places of interest. Therefore, trajectory query processing has emerged in recent years to help users find their best trajectories. However, with the huge amount of trajectory points and text descriptions, such as the activities practiced by users at these points, organizing these data in the index becomes tedious. Therefore, the parallel method becomes indispensable. In this paper, we have investigated the problem of distributed trajectory query processing based on the distance and frequent activities. The query is specified by start and final points in the trajectory, the distance threshold, and a set of frequent activities involved in the point of interest of the *** a result, the query returns the shortest trajectory including the most frequent activities with high support and high confidence. To simplify the query processing, we have implemented the Distributed Mining Trajectory R-Tree index(DMTR-Tree). For this method, we initially managed the large trajectory dataset in distributed R-Tree ***, for each index, we applied the frequent itemset Apriori algorithm for each point to select the frequent activity set. For the faster computation of the above algorithms, we utilized the cluster computing framework of Apache Spark with MapReduce as the programing model. The experimental results show that the DMTR-Tree index and the query-processing algorithm are efficient and can achieve the scalability.

关键词： distributed R-tree trajectory frequent activity query

Detention basins as best management practices for water quality control in an arid region

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Water Science and Engineering 2014年第2期7卷 155-167页

作者： amina R. LODHI Kumud ACHARYA Division of Hydrologic Sciences Desert Research Institute

Flood control detention basins （DBs） can act as water quality control structures or best management practices （BMPs）. A key pollutant that DBs serve to settle out is particulate phosphorus, which adsorbs onto sediment. This study examines the sediment phosphorus concentration and its relationship with the particle size of sediment microcosms from pre- and post-rain event samples obtained from six DBs located in Clark County, Nevada. DBs were allotted a land use classification to determine if there was a correlation between the sediment phosphorus concentration and surrounding land use. The curve number method was used to calculate the runoff and subsequent phosphorus carried into the DB by the runoff. Our data show sediment phosphorus concentrations to he highest in soils from undeveloped areas. Runoff amount also plays a substantial role in determining the amount of phosphorus brought into the DB by sediment. This research has implications for improvement of water quality in arid regions.

关键词： detention basin soil contamination runoff calculation water quality control,"phosphorus Las Vegas Valley Watershed

A Multi-server Queue in a Multi-phase Random Environment with Waiting Servers and Customers'Impatience Under Synchronous Working Vacation Policy

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of the Operations Research Society of China 2023年第3期11卷 459-487页

作者： Meriem Houalef amina Angelika Bouchentouf Lahcene Yahiaoui Mathematics Laboratory University of Sidi Bel AbbesEcole Supérieure En Sciences AppliquéesTlemcen13000Algeria Mathematics Laboratory Djillali Liabes University of Sidi Bel AbbesSidi Bel Abbes22000Algeria Laboratory of Stochastic Models Statistic and ApplicationsUniversity of Saida-Dr.Moulay TaharB.P.138En-NasrSaidaAlgeria

In this paper,we develop an M/M/c queueing system in a Markovian environment with waiting servers,balking and reneging,under both synchronous single and multiple working vacation *** the system is in operative phase j,j=1,K¯,customers are served one by *** the system is empty,the servers have to wait a random period of time before leaving,causing the system to move to vacation phase 0 at which new arrivals can be served at lower *** the method of the probability generating functions,we establish the steady-state analysis of the *** cases of the queueing model are ***,explicit expressions of the useful system characteristics are *** addition,a cost model is constructed to define the optimal values of service rates,simultaneously,to minimize the total expected cost per unit time via a quadratic fit search *** examples are provided to display the impact of different system characteristics.

关键词： Queueing models Random environment Working vacation policy Impatient customers Probability generating function Optimization

Unravelling the linkages of cryosphere and mountain livelihood systems:A case study of Langtang,Nepal

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Climate Change Research 2021年第1期12卷 119-131页

作者： Sabamee TULADHAR Binaya PASAKHALA amina MAHARJAN Arabinda MISHRA International Centre for Integrated Mountain Development(ICIMOD) Kathmandu44703Nepal

Globally,mountains are often characterized as fragile and hazardous terrains,with vast areas covered by the *** livelihoods of communities in the Hindu Kush Himalayan region are closely linked with the *** over the past few decades,communities in the region have experienced multiple changes,including those driven by climat e change,with direct and immediate impacts on their lives and *** this study,we explore linkages between the cryosphere and high-mountain livelihoods using a social-ecological system *** examines how the complex social-ecological system in villages in Langtang Valley,Nepal,has evolved in response to both cryospheric and socioeconomic *** local communities perceive gradual but significant changes in the cryospheric system,such as receding and thinning glaciers,changing snowfall patterns,changes in temperature and precipitation patterns,and a growing incidence of cryosphere-related hazards,such as avalanches and *** in the Langtang Valley are also facing a number of socioeconomic changes,resulting in changing aspirations,particularly among the *** growing disconnection between society and the surrounding cryosphere,with direct impacts on the transfer and growth of local knowledge systems,are *** simultaneous changes in the cryosphere and the socioeconomic domain have also resulted in a homogenization of livelihood sources,with tourism emerging as the dominant source of *** has resulted in a dependence of the local population on food imported from outside the valley.A growing dependence on tourism for livelihoods,dependence on imports for food and other basic needs,and the lack of a risk reduction strategy might pose great risks for local lives and livelihoods in the long *** pertaining to diversifying livelihoods,harmonizing social capital,and hazard risk assessment are essential for strengthening linkages between cryosphere and the socioe

关键词： Cryosphere-livelihood linkages Social-ecological systems Climate change High-mountain communities Hindu Kush Himalaya Langtang Valley

The Role of Public Health Within the United Nations Post-2015 Framework for Disaster Risk Reduction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Disaster Risk Science 2015年第1期6卷 28-37页

作者： Virginia Murray amina Aitsi-Selmi Kevin Blanchard Public Health Strategy Division Public Health England

This article explores the role of public health systems before, during, and after disasters, particularly within the scope of the United Nations Post-2015 Framework for Disaster Risk Reduction. It also examines the role of scientific and technological developments in assisting with improving the resilience of public health professionals and the communities they work in. In addition, it explores how the wide-ranging activities in public health have already contributed to the improved management of disasters and a decrease in associated risks. The article identifies areas of synergy in five key areas of recent policy and practice in public health(the health systems approach, risk assessments, the WHO/UNISDR/HPA Disaster Risk Management fact sheets, chronic disease and disasters, and mental health impacts following disasters) and makes suggestions based on lessons identified from the previous(2005) global disaster risk reduction framework. In particular, we advocate the use of scientific evidence that addresses health and disaster risk simultaneously to increase the effectiveness of policy and practice in disaster risk reduction, health, and public health.

关键词： Disaster risk reduction Health systems Post-2015 framework Public health Risk assessments

The Low-Rank Approximation of Fourth-Order Partial-Symmetric and Conjugate Partial-Symmetric Tensor

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of the Operations Research Society of China 2023年第4期11卷 735-758页

作者： amina Sabir Peng-Fei Huang Qing-Zhi Yang School of Mathematics and Statistics Kashi UniversityKashi844008XinjiangChina School of Mathematical Sciences and LPMC Nankai UniversityTianjin300071China

We present an orthogonal matrix outer product decomposition for the fourth-order conjugate partial-symmetric(CPS)tensor and show that the greedy successive rank-one approximation(SROA)algorithm can recover this decomposition *** on this matrix decomposition,the CP rank of CPS tensor can be bounded by the matrix rank,which can be applied to low-rank tensor ***,we give the rank-one equivalence property for the CPS tensor based on the SVD of matrix,which can be applied to the rank-one approximation for CPS tensors.

关键词： Conjugate partial-symmetric tensor Approximation algorithm Rank-one equivalence property Convex relaxation

A Fast Panoptic Segmentation Network for Self-Driving Scene Understanding

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer Systems Science & Engineering 2022年第10期43卷 27-43页

作者： Abdul Majid Sumaira Kausar Samabia Tehsin amina Jameel Department of Computer Science Bahiria UniversityIslamabadPakistan Department of Software Engineering Bahiria UniversityKarachiPakistan

In recent years,a gain in popularity and significance of science understanding has been observed due to the high paced progress in computer vision techniques and *** primary focus of computer vision based scene understanding is to label each and every pixel in an image as the category of the object it belongs *** it is required to combine segmentation and detection in a single *** many successful computer vision methods has been developed to aid scene understanding for a variety of real world *** understanding systems typically involves detection and segmentation of different natural and manmade things.A lot of research has been performed in recent years,mostly with a focus on things(a well-defined objects that has shape,orientations and size)with a less focus on stuff classes(amorphous regions that are unclear and lack a shape,size or other characteristics Stuff region describes many aspects of scene,like type,situation,environment of scene *** hence can be very helpful in scene *** methods for scene understanding still have to cover a challenging path to cope up with the challenges of computational time,accuracy and robustness for varying level of scene complexity.A robust scene understanding method has to effectively deal with imbalanced distribution of classes,overlapping objects,fuzzy object boundaries and poorly localized *** proposed method presents Panoptic Segmentation on Cityscapes ***-V2 is used as a backbone for feature extraction that is pre-trained on ***-V2 with state-of-art encoder-decoder architecture of DeepLabV3+with some customization and optimization is employed Atrous convolution along with Spatial Pyramid Pooling are also utilized in the proposed method to make it more accurate and *** promising and encouraging results have been achieved that indicates the potential of the proposed method for robust scene understanding in a fast and

关键词： Panoptic segmentation instance segmentation semantic segmentation deep learning computer vision scene understanding autonomous applications atrous convolution

Diabetic wounds and artificial intelligence:A mini-review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2023年第1期11卷 84-91页

作者： Samabia Tehsin Sumaira Kausar amina Jameel Computer Science Bahria UniversityKarachi 75260SindhPakistan Computer Science Bahria UniversityIslamabad 46000Pakistan Department of Computer Engineering Bahria UniversityIslamabad 46000Pakistan

Diabetic wound takes longer time to heal due to micro and macro-vascular *** longer healing time can lead to infections and other health *** ulcers are one of the most common diabetic *** are one of the leading cause of *** science is continuously striving for improving quality of human life.A recent trend of amalgamation of knowledge,efforts and technological advancement of medical science experts and artificial intelligence researchers,has made tremendous success in diagnosis,prognosis and treatment of a variety of *** wounds are no exception,as artificial intelligence experts are putting their research efforts to apply latest technological advancements in the field to help medical care personnel to deal with diabetic wounds in more effective *** presented study reviews the diagnostic and treatment research under the umbrella of Artificial Intelligence and computational science,for diabetic wound *** for diabetic wound assessment using artificial intelligence is ***,this review is focused on existing and potential contribution of artificial intelligence to improve medical services for diabetic wound *** article also discusses the future directions for the betterment of the field that can lead to facilitate both,clinician and patients.

关键词： Diabetic wounds Artificial intelligence Foot ulcer Amputation Diagnosis Machine learning

Turbulent Double-Diffusive Natural Convection and Entropy Generation within an Inclined Square Cavity

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fluid Dynamics & Materials Processing 2022年第6期18卷 1619-1629页

作者： Khaled Said Ahmed Ouadha amina Sabeur Laboratoire des Sciences et Ingénierie Maritimes Facultéde Génie MécaniqueUniversitédes Sciences et de la Technologie Mohamed BOUDIAF d’OranOran El-MnouarAlgérie

The present study deals with double-diffusive convection within a two-dimensional inclined cavity filled with an air-CO_(2) binary gas *** left and the right vertical walls are differentially heated and subjected to different locations of(CO_(2))contaminants to allow for the variation of the buoyancy strength(N).However,the horizontal walls are assumed *** simulations are conducted using the finite volume method to solve the conservation equations of continuity,momentum,energy,and species *** agreement with other numerical results in the literature is *** effect of multiple parameters,namely,buoyancy ratio(N),thermal Rayleigh number(Ra),and inclination angle(α)on entropy generation rate is analyzed and discussed in the postprocessing stage,while considering both laminar and turbulent flow *** computations reveal that these parameters considerably affect both the heat and mass transfer performances of the system.

关键词： CFD entropy generation double diffusive convection inclination angle CO_(2) turbulent regime