The Experts below are selected from a list of 119889 Experts worldwide ranked by ideXlab platform
Zhu Han - One of the best experts on this subject based on the ideXlab platform.
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Spectrum Sensing Under Spectrum Misuse Behaviors: A Multi-Hypothesis Test Perspective
IEEE Transactions on Information Forensics and Security, 2018Co-Authors: Linyuan Zhang, Guoru Ding, Zhu HanAbstract:Spectrum misuse behaviors, brought either by illegitimate access or by rogue power emission, endanger the legitimate communication and deteriorate the spectrum Usage Environment. In this paper, our aim is to detect whether the spectrum band is occupied, and if it is occupied, recognize whether the misuse behavior exists. One vital challenge is that the legitimate spectrum exploitation and misuse behaviors probabilistically coexist and the illegitimate user may act in an intermittent and fast-changing manner, which brings about much uncertainty for spectrum sensing. To tackle it, we first formulate the spectrum sensing problems under illegitimate access and rogue power emission as a uniform ternary hypothesis test. Then, we develop a novel test criterion, named the generalized multi-hypothesis Neyman–Pearson (GMNP) criterion. Following the criterion, we derive two test rules based on the generalized likelihood ratio test and the Rao test, respectively, whose asymptotic performances are analyzed and an upper bound is also given. Furthermore, a cooperative spectrum sensing scheme is designed based on the global GMNP criterion to further improve the detection performances. In addition, extensive simulations are provided to verify the proposed schemes’ performance under various parameter configurations.
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Spectrum Sensing under Spectrum Misuse Behaviors: A Multi-Hypothesis Test Perspective
arXiv: Signal Processing, 2017Co-Authors: Linyuan Zhang, Guoru Ding, Zhu HanAbstract:Spectrum misuse behaviors, brought either by illegitimate access or by rogue power emission, endanger the legitimate communication and deteriorate the spectrum Usage Environment. In this paper, our aim is to detect whether the spectrum band is occupied, and if it is occupied, recognize whether the misuse behavior exists. One vital challenge is that the legitimate spectrum exploitation and misuse behaviors coexist and the illegitimate user may act in an intermittent and fast-changing manner, which brings about much uncertainty for spectrum sensing. To tackle it, we firstly formulate the spectrum sensing problems under illegitimate access and rogue power emission as a uniform ternary hypothesis test. Then, we develop a novel test criterion, named the generalized multi-hypothesis N-P criterion. Following the criterion, we derive two test rules based on the generalized likelihood ratio test and the R-test, respectively, whose asymptotic performances are analyzed and an upper bound is also given. Furthermore, a cooperative spectrum sensing scheme is designed based on the global N-P criterion to further improve the detection performances. In addition, extensive simulations are provided to verify the proposed schemes' performance under various parameter configurations.
Linyuan Zhang - One of the best experts on this subject based on the ideXlab platform.
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Spectrum Sensing Under Spectrum Misuse Behaviors: A Multi-Hypothesis Test Perspective
IEEE Transactions on Information Forensics and Security, 2018Co-Authors: Linyuan Zhang, Guoru Ding, Zhu HanAbstract:Spectrum misuse behaviors, brought either by illegitimate access or by rogue power emission, endanger the legitimate communication and deteriorate the spectrum Usage Environment. In this paper, our aim is to detect whether the spectrum band is occupied, and if it is occupied, recognize whether the misuse behavior exists. One vital challenge is that the legitimate spectrum exploitation and misuse behaviors probabilistically coexist and the illegitimate user may act in an intermittent and fast-changing manner, which brings about much uncertainty for spectrum sensing. To tackle it, we first formulate the spectrum sensing problems under illegitimate access and rogue power emission as a uniform ternary hypothesis test. Then, we develop a novel test criterion, named the generalized multi-hypothesis Neyman–Pearson (GMNP) criterion. Following the criterion, we derive two test rules based on the generalized likelihood ratio test and the Rao test, respectively, whose asymptotic performances are analyzed and an upper bound is also given. Furthermore, a cooperative spectrum sensing scheme is designed based on the global GMNP criterion to further improve the detection performances. In addition, extensive simulations are provided to verify the proposed schemes’ performance under various parameter configurations.
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Spectrum Sensing under Spectrum Misuse Behaviors: A Multi-Hypothesis Test Perspective
arXiv: Signal Processing, 2017Co-Authors: Linyuan Zhang, Guoru Ding, Zhu HanAbstract:Spectrum misuse behaviors, brought either by illegitimate access or by rogue power emission, endanger the legitimate communication and deteriorate the spectrum Usage Environment. In this paper, our aim is to detect whether the spectrum band is occupied, and if it is occupied, recognize whether the misuse behavior exists. One vital challenge is that the legitimate spectrum exploitation and misuse behaviors coexist and the illegitimate user may act in an intermittent and fast-changing manner, which brings about much uncertainty for spectrum sensing. To tackle it, we firstly formulate the spectrum sensing problems under illegitimate access and rogue power emission as a uniform ternary hypothesis test. Then, we develop a novel test criterion, named the generalized multi-hypothesis N-P criterion. Following the criterion, we derive two test rules based on the generalized likelihood ratio test and the R-test, respectively, whose asymptotic performances are analyzed and an upper bound is also given. Furthermore, a cooperative spectrum sensing scheme is designed based on the global N-P criterion to further improve the detection performances. In addition, extensive simulations are provided to verify the proposed schemes' performance under various parameter configurations.
Guoru Ding - One of the best experts on this subject based on the ideXlab platform.
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Spectrum Sensing Under Spectrum Misuse Behaviors: A Multi-Hypothesis Test Perspective
IEEE Transactions on Information Forensics and Security, 2018Co-Authors: Linyuan Zhang, Guoru Ding, Zhu HanAbstract:Spectrum misuse behaviors, brought either by illegitimate access or by rogue power emission, endanger the legitimate communication and deteriorate the spectrum Usage Environment. In this paper, our aim is to detect whether the spectrum band is occupied, and if it is occupied, recognize whether the misuse behavior exists. One vital challenge is that the legitimate spectrum exploitation and misuse behaviors probabilistically coexist and the illegitimate user may act in an intermittent and fast-changing manner, which brings about much uncertainty for spectrum sensing. To tackle it, we first formulate the spectrum sensing problems under illegitimate access and rogue power emission as a uniform ternary hypothesis test. Then, we develop a novel test criterion, named the generalized multi-hypothesis Neyman–Pearson (GMNP) criterion. Following the criterion, we derive two test rules based on the generalized likelihood ratio test and the Rao test, respectively, whose asymptotic performances are analyzed and an upper bound is also given. Furthermore, a cooperative spectrum sensing scheme is designed based on the global GMNP criterion to further improve the detection performances. In addition, extensive simulations are provided to verify the proposed schemes’ performance under various parameter configurations.
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Spectrum Sensing under Spectrum Misuse Behaviors: A Multi-Hypothesis Test Perspective
arXiv: Signal Processing, 2017Co-Authors: Linyuan Zhang, Guoru Ding, Zhu HanAbstract:Spectrum misuse behaviors, brought either by illegitimate access or by rogue power emission, endanger the legitimate communication and deteriorate the spectrum Usage Environment. In this paper, our aim is to detect whether the spectrum band is occupied, and if it is occupied, recognize whether the misuse behavior exists. One vital challenge is that the legitimate spectrum exploitation and misuse behaviors coexist and the illegitimate user may act in an intermittent and fast-changing manner, which brings about much uncertainty for spectrum sensing. To tackle it, we firstly formulate the spectrum sensing problems under illegitimate access and rogue power emission as a uniform ternary hypothesis test. Then, we develop a novel test criterion, named the generalized multi-hypothesis N-P criterion. Following the criterion, we derive two test rules based on the generalized likelihood ratio test and the R-test, respectively, whose asymptotic performances are analyzed and an upper bound is also given. Furthermore, a cooperative spectrum sensing scheme is designed based on the global N-P criterion to further improve the detection performances. In addition, extensive simulations are provided to verify the proposed schemes' performance under various parameter configurations.
Hae Kwang Kim - One of the best experts on this subject based on the ideXlab platform.
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Audio adaptation according to Usage Environment and perceptual quality metrics
IEEE Transactions on Multimedia, 2005Co-Authors: Bernhard Feiten, Jeongil Seo, Ingo Wolf, Eunmi Oh, Hae Kwang KimAbstract:Future audio applications will need to handle a wide variety of end-devices and networks from low quality mobile services to very high quality home entertainment services. The MPEG-21 Digital Item Adaptation standard specifies a variety of tools that aim to enhance the user experience and maximize the perceived quality of service. This paper focuses on the audio-related tools, including audio Usage Environment descriptions and techniques for audio resource adaptation. Additionally, subjective and objective measures are discussed in the context of bit-rate adaptation. New quality measures, brightness, cleanness, and wideness are proposed for controlling the quality of the audio transmission.
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Smart Graphics - 3D graphics adaptation system on the basis of MPEG-21 DIA
Smart Graphics, 2003Co-Authors: Hae Kwang Kim, Nam-yeol Lee, Jinwoong KimAbstract:In this paper, adaptation of 3D graphics on the basis of the MPEG-21 DIA (Digital Item Adaptation) standard is presented. The MPEG-21 DIA standard covers a general Usage Environment description framework for adapting multimedia contents including computer graphics. The adaptation parameters for the 3D graphics consist of user characteristics and terminal capability. The user characteristics parameters represent the user's quality preferences on graphics components of geometry, material and animation as well as 3D to 2D conversion preference. The terminal capability parameters represent the graphics format and the graphics processing capacity of vertex processing rate, fill rate and memory bandwidth. MPEG-21 3D graphics DIA adaptation system adapts 3D graphics to these Usage Environment parameters input from the user for the best experience of the graphics contents.
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3D graphics adaptation system on the basis of MPEG-21 DIA
Lecture Notes in Computer Science, 2003Co-Authors: Hae Kwang Kim, Nam-yeol Lee, Jinwoong KimAbstract:In this paper, adaptation of 3D graphics on the basis of the MPEG-21 DIA (Digital Item Adaptation) standard is presented. The MPEG-21 DIA standard covers a general Usage Environment description framework for adapting multimedia contents including computer graphics. The adaptation parameters for the 3D graphics consist of user characteristics and terminal capability. The user characteristics parameters represent the user's quality preferences on graphics components of geometry, material and animation as well as 3D to 2D conversion preference. The terminal capability parameters represent the graphics format and the graphics processing capacity of vertex processing rate, fill rate and memory bandwidth. MPEG-21 3D graphics DIA adaptation system adapts 3D graphics to these Usage Environment parameters input from the user for the best experience of the graphics contents.
John R. Smith - One of the best experts on this subject based on the ideXlab platform.
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Video personalization and summarization system for Usage Environment
Journal of Visual Communication and Image Representation, 2004Co-Authors: Belle L. Tseng, Ching-yung Lin, John R. SmithAbstract:A video personalization and summarization system is designed and implemented incorporating Usage Environment to dynamically generate a personalized video summary. The personalization system adopts the three-tier server-middleware-client architecture in order to select, adapt, and deliver rich media content to the user. The server stores the content sources along with their corresponding MPEG-7 metadata descriptions. Our semantic metadata is provided through the use of the VideoAnnEx MPEG-7 Video Annotation Tool. When the user initiates a request for content, the client communicates the MPEG-21 Usage Environment description along with the user query to the middleware. The middleware is powered by the personalization engine and the content adaptation engine. Our personalization engine includes the VideoSue Summarization on Usage Environment engine that selects the optimal set of desired contents according to user preferences. Afterwards, the adaptation engine performs the required transformations and compositions of the selected contents for the specific Usage Environment using our VideoEd Editing and Composition Tool. Finally, two personalization and summarization systems are demonstrated for the IBM Websphere Portal Server and for pervasive PDA devices.
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Hierarchical video summarization based on context clustering
Internet Multimedia Management Systems IV, 2003Co-Authors: Belle L. Tseng, John R. SmithAbstract:A personalized video summary is dynamically generated in our video personalization and summarization system based on user preference and Usage Environment. The three-tier personalization system adopts the server-middleware-client architecture in order to maintain, select, adapt, and deliver rich media content to the user. The server stores the content sources along with their corresponding MPEG-7 metadata descriptions. In this paper, the metadata includes visual semantic annotations and automatic speech transcriptions. Our personalization and summarization engine in the middleware selects the optimal set of desired video segments by matching shot annotations and sentence transcripts with user preferences. Besides finding the desired contents, the objective is to present a coherent summary. There are diverse methods for creating summaries, and we focus on the challenges of generating a hierarchical video summary based on context information. In our summarization algorithm, three inputs are used to generate the hierarchical video summary output. These inputs are (1) MPEG-7 metadata descriptions of the contents in the server, (2) user preference and Usage Environment declarations from the user client, and (3) context information including MPEG-7 controlled term list and classification scheme. In a video sequence, descriptions and relevance scores are assigned to each shot. Based on these shot descriptions, context clustering is performed to collect consecutively similar shots to correspond to hierarchical scene representations. The context clustering is based on the available context information, and may be derived from domain knowledge or rules engines. Finally, the selection of structured video segments to generate the hierarchical summary efficiently balances between scene representation and shot selection.
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Video personalization for Usage Environment
Internet Multimedia Management Systems III, 2002Co-Authors: Belle L. Tseng, Ching-yung Lin, John R. SmithAbstract:A video personalization and summarization system is designed and implemented incorporating Usage Environment to dynamically generate a personalized video summary. The personalization system adopts the three-tier server-middleware-client architecture in order to select, adapt, and deliver rich media content to the user. The server stores the content sources along with their corresponding MPEG-7 metadata descriptions. Our semantic metadata is provided through the use of the VideoAnnEx MPEG-7 Video Annotation Tool. When the user initiates a request for content, the client communicates the MPEG-21 Usage Environment description along with the user query to the middleware. The middleware is powered by the personalization engine and the content adaptation engine. Our personalization engine includes the VideoSue Summarization on Usage Environment engine that selects the optimal set of desired contents according to user preferences. Afterwards, the adaptation engine performs the required transformations and compositions of the selected contents for the specific Usage Environment using our VideoEd Editing and Composition Tool. Finally, two personalization and summarization systems are demonstrated for the IBM Websphere Portal Server and for the pervasive PDA devices.
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IEEE Workshop on Multimedia Signal Processing - Video personalization and summarization system
2002 IEEE Workshop on Multimedia Signal Processing., 1Co-Authors: Belle L. Tseng, Ching-yung Lin, John R. SmithAbstract:A video personalization and summarization system is designed and implemented to dynamically generate a personalized video summary. The personalization system adopts the three-tier server-middleware-client architecture in order to select, adapt, and deliver rich media content to the user. The server stores the content sources along with their corresponding MPEG-7 metadata descriptions. These semantic metadata are provided through the use of our VideoAnnEx MPEG-7 video annotation tool. When the user initiates a request for content, the client communicates the user request and Usage Environment descriptions to the middleware. The middleware is powered by the personalization engine and the content adaptation engine. Our personalization engine includes the VideoSue summarization on Usage Environment engine that selects the optimal set of desired contents according to user preferences. Afterwards, the adaptation engine performs the required transformations and compositions of the selected contents for the specific Usage Environment using our VideoEd editing and composition tool. Finally, a personalization and summarization system is demonstrated on the IBM Websphere Portal Server for PCs and pervasive devices.
