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Friendship Inference Based on Interest Trajectory Similarity and Co-occurrence

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Chinese Journal of Electronics 2024年第3期33卷 708-720页

作者： Junfeng TIAN Zhengqi HOU School of Cyber Security and Computer Hebei University Hebei Key Laboratory of High Confidence Information Systems Hebei University

Most of the current research on user friendship speculation in location-based social networks is based on the co-occurrence characteristics of users,however,statistics find that co-occurrence is not common among all users;meanwhile,most of the existing work focuses on mining more features to improve the accuracy but ignoring the time complexity in practical applications.On this basis,a friendship inference model named ITSIC is proposed based on the similarity of user interest tracks and joint user location co-occurrence.By utilizing MeanShift clustering algorithm,ITSIC clustered and filtered user check-ins and divided the dataset into interesting,abnormal,and noise check-ins.User interest trajectories were constructed from user interest check-in data,which allows ITSIC to work efficiently even for users without co-occurrences.At the same time,by application of clustering,the single-moment multi-interest trajectory was further proposed,which increased the richness of the meaning of the trajectory moment.The extensive experiments on two real online social network datasets show that ITSIC outperforms existing methods in terms of AUC score and time efficiency compared to existing methods.

关键词： data privacy Social networking (online) Noise Clustering algorithms Prediction algorithms Inference algorithms data models

The Squeeze & Excitation Normalization Based nnU-Net for Segmenting Head & Neck Tumors

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Chinese Journal of Electronics 2024年第3期33卷 766-775页

作者： Juanying XIE Ying PENG Mingzhao WANG School of Computer Science Shaanxi Normal University

Head and neck cancer is one of the most common malignancies in the world.We propose SE-nnU-Net by adapting SE(squeeze and excitation) normalization into nnU-Net,so as to segment head and neck tumors in PET/CT images by combining advantages of SE capturing features of interest regions and nnU-Net configuring itself for a specific task.The basic module referred to convolution-ReLU-SE is designed for SE-nnU-Net.In the encoder it is combined with residual structure while in the decoder without residual structure.The loss function combines Dice loss and Focal loss.The specific data preprocessing and augmentation techniques are developed,and specific network architecture is designed.Moreover,the deep supervised mechanism is introduced to calculate the loss function using the last four layers of the decoder of SE-nnU-Net.This SE-nnU-net is applied to HECKTOR 2020 and HECKTOR 2021 challenges,respectively,using different experimental design.The experimental results show that SE-nnU-Net for HECKTOR 2020 obtained 0.745,0.821,and 0.725 in terms of Dice,Precision,and Recall,respectively,while the SE-nnU-Net for HECKTOR 2021 obtains 0.778 and 3.088 in terms of Dice and median HD95,respectively.This SE-nnU-Net for segmenting head and neck tumors can provide auxiliary opinions for doctors diagnoses.

关键词： Image segmentation Head data preprocessing Artificial neural networks Network architecture data models Neck

Research on a didtributed simulation based on unified interface

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Journal of Systems Engineering and Electronics 2004年第4期15卷 696-701页

作者： SunZhixin WangRuchua WangShaodi ZhangQin DeparmentofComputerScience&Technology NanjingUniversityofPostsandTelecommunicationsNanjing210003P.R.Chian

With the scale of simulation system increasing rapidly, the distributed interactive simulation (DIS) faces the problem fo system scalability. One of main factors, which influence the DIS scalability, is that the lacks of standard defining interface methods, as the number of the system modules increased. This paper presents a method of defining an unified interface among different models. Then a DIS development platform based on it is established after thorough studies of the reasons that cause the DIS scalability problems. Finally we demonstrate the method by realization of an experiment DIS system in LAN environment. It validates that a practical system development can be carried out rapidly and efectively on this DIS development plaform. The experimental results show that the unified interface has general purpose for the design and implementation of DIS systems.

关键词： data models Visualization Servers Scalability Three dimensional displays Object recognition

Drifting model approach to modeling based on weighted support vector machines

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Journal of Systems Engineering and Electronics 2004年第4期15卷 610-614页

作者： FengRui SongChunlin ShaoHuihe DepartmentofAutomation ShanghaiJiaotongUniversityShanghai200030P.R.China DepartmentofComputerScience NortheasternUniversityShenyang110003P.R.China

This paper proposes a novel drifting modeling (DM) method. Briefly, we first employ an improved SVMs algorithm named weighted support vector machines (W.SVMs), which is suitable for locally learning, and then the DM method using the algorithm is proposed. By applying the proposed modeling method to Fluidized Catalytic Cracking Unit (FCCU), the simulation results show that the property of this proposed approach is superior to global modeling method based on standard SVMs.

关键词： Vectors data models Computational modeling Support vector machines Estimation Petroleum

A Multi-agent Based Evaluation Framework and Its Applications

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IEEE/CAA Journal of Automatica Sinica 2014年第2期1卷 218-224页

作者： Jinlong Wang Qianchuan Zhao Haitao Li Center for Intelligent and Networked System Department of AutomationTsinghua University

The evaluation system is significant for assessment of technologies, experiments, energy cost and effectiveness, especially for the complicated engineering systems, such as energy systems, weapon systems and spacecraft systems. However, as engineering systems become more and more distributed and heterogeneous, evaluation frameworks need to be more universal,distributed and interactive. In this paper, we compare several typical evaluation frameworks and propose a novel evaluation framework based on multi-agent technology. We provide two case studies, indoor comfort system and technology assessment of spacecraft systems, respectively. The results show that the proposed framework can work efficiently.

关键词： Multi-agent systems Standards Indexes Measurement Robot sensing systems data models Computer architecture

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A Multilevel Secure Relation-Hierarchical data Model for a Secure DBMS

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Journal of Modern Transportation 2001年第1期18卷 8-16页

作者：朱虹冯玉才 School of Computer Science and Technology Huazhong University of Science and Technology

A multilevel secure relation hierarchical data model for multilevel secure database is extended from the relation hierarchical data model in single level environment in this paper. Based on the model, an upper lower layer relationalintegrity is presented after we analyze and eliminate the covert channels caused by the database integrity.Two SQL statements are extended to process polyinstantiation in the multilevel secure environment.The system based on the multilevel secure relation hierarchical data model is capable of integratively storing and manipulating complicated objects ( e.g. , multilevel spatial data) and conventional data ( e.g. , integer, real number and character string) in multilevel secure database.

关键词： databases data structure data models secure DBMS covert channels mandatory access control polyinstantiation hierarchical classification non hierarchical category security level integrity cluster index

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Using Multidimensional Views of Photographs for Flood Modelling

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Using Multidimensional Views of Photographs for Flood Modell...

Application of CAD Technology of Human Body Model Reconstruction Based on Imageware

2012 IEEE 6th International Conference on Information and Automation for Sustainability（ICIAFS2012）

作者： Vorawit Meesuk Zoran Vojinovic Arthur E.Mynett Hydro and Agro Informatics Institute Ministry of Science and Technology Bangkok Thai Tower8 th FloorRangnamPhayathai10400BangkokThailand UNESCO-IHE Institute for Water Education Westvest 7 2611 AXDelftThe Netherlands Faculty of Civil Engineering and Geosciences Delft University of Technology Stevinweg 12628 CNDelftThe Netherlands

Using physically based computational models coupled with remote sensing technologies,photogrammetry techniques,and GIS applications are important tools for flood hazard mapping and flood disaster prevention.Also,information processing of massive input data with refined accuracy allows us to develop and to improve urban-floodmodeling at a detailed level.The topographical information from digital surface model（DSM） or digital terrain model（DTM） is essential for flood managers who actually require this high accuracy and resolution of input data to set up their practical applications.Light detecting and ranging（LiDAR） techniques are mainly used,but these costly techniques can be appraised by equipments,maintenance,and operations which include aircraft.Recent advances in photogrammetry and computer vision technologies like structure form motion（SfM） technique are widely used and offer cost-effective approaches to reconstruct 3D-topographical information from simple 2D photos,so-called 3D reconstruction.In terms of input data for flood modeling,the SfM technique can be comparable to other acquisition-techniques.In this paper,there are one experimental and two case studies.Firstly,a result of the experiment showed a similarity between flood maps by applying the SfM process form the 3D-reconstruction and using benchmark information.These 3D-reconstruction processes started from 2D photos,which were taken from virtual scenes by using multidimensional-view approach.These photos can be used to generate 3D information which is later used to create the DSM from multidimensional fusion of views（MFV-DSM）.Then,the DSM was used as input data to set up 2D flood modeling.Thereafter,when using the DSMs as topographical input data,comparison between a benchmark DSM and MFV-DSM shows similarity flood-map results in both flood depths and flood extends.Secondary,the two cases from real world scenes also showed possibilities of using the SfM technique as an alternative acquisition tool,providing 3D information.This information can be use

关键词： Floods data models Benchmark testing Software Buildings Digital cameras

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Application of CAD Technology of Human Body Model Reconstruc...

A Dual-ported Variable-way L1 D-cache Design for High Performance Embedded DSP

2011 International Conference on Control, Automation and Systems Engineering(CASE)

作者： Xiaoning Jing Xiaojiu Li School of Art and Clothing Tianjin Polytechnic University TJPU

This paper gives the definition of reverse engineering and the process of reverse modeling software — imageware. Using imageware, we complete the reconstruction of the human body surface from point cl

关键词： Surface fitting Surface treatment Surface reconstruction Image reconstruction Solid modeling data models Software

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A Dual-ported Variable-way L1 D-cache Design for High Perfor...