Mixed reality participants in smart meeting rooms and smart home environments

Human–computer interaction requires modeling of the user. A user profile typically contains preferences, interests, characteristics, and interaction behavior. However, in its multimodal interaction with a smart environment the user displays characteristics that show how the user, not necessarily consciously, verbally and nonverbally provides the smart environment with useful input and feedback. Especially in ambient intelligence environments we encounter situations where the environment supports interaction between the environment, smart objects (e.g., mobile robots, smart furniture) and human participants in the environment. Therefore it is useful for the profile to contain a physical representation of the user obtained by multi-modal capturing techniques. We discuss the modeling and simulation of interacting participants in a virtual meeting room, we discuss how remote meeting participants can take part in meeting activities and they have some observations on translating research results to smart home environments.     

多媒体视频处理基础知识解析

文章通过对多媒体影视制作中所涉及到的技术的探讨，结合实际制作经验，简要阐述了在多媒体视频处理中，所涉及到的基础知识、硬件设备及各种连接方式，为视频的处理提供一个良好的操作平台，确保作品质量，再配备合适的软件加以处理将带给观赏者更完美、更赏心悦目的画面.     

多媒体视频处理基础知识解析

文章通过对多媒体影视制作中所涉及到的技术的探讨,结合实际制作经验,简要阐述了在多媒体视频处理中,所涉及到的基础知识、硬件设备及各种连接方式,为视频的处理提供一个良好的操作平台,确保作品质量,再配备合适的软件加以处理将带给观赏者更完美、更赏心悦目的画面。     

用VB编写Windows XP系统的娱乐游戏类附件工具

介绍如何用最少的VB代码,自制WindowsXP系统的娱乐游戏类附件工具。     

基于注释的流式视频点播学习系统的设计

该文在分析流式视频传输原理的基础上,讨论了流式视频与注释相结合的网络点播学习系统的特点和功能,并提出了相应的系统模型。     

FESORIA: An integrated system for analysis,management and smart presentation of audio/video streaming services

Due to the elevated consumption of resources, the high cost of the production of contents and the quality of service required in audio/video streaming services, it is extremely important to optimize all the elements involved in the deployment of these services. With this goal in mind, provider companies have developed their management and presentation tools. At the same time, some specific tools for audio/video streaming analysis have appeared. Data are collected from servers and proxies by analyzing their log files in order to generate different types of reports. In spite of their utility, there is a disconnection between these types of tools. In this way, several important relationships between collected data are lost and the influence of other important aspects such as the behaviour of the users and their relationship with the subject or the length of the contents is not considered. This generates inaccurate analyses and the impossibility to improve the presentation, for example by generating recommendations using the information gathered from the analysis tool. Fesoria is a system which combines both characteristics. It is an analysis tool and, at the same time, a system to manage the whole audio/video service. Fesoria is able to process the logs gathered from the streaming servers and proxies, and combine the extracted information with other types of data, such as content metadata, content distribution networks architecture, user preferences, etc. All this information is analyzed in order to generate reports on service performance, access evolution and users’ preferences, and thus to improve the presentation of the services. The system has been used in real audio/video services since 2001 with satisfactory results.

Windows低级音频函数剖析及应用

本文分析了Windows系统提供的音频服务、波形音频文件的结构，重点阐述了低级音频函数使用方法，并结合实际应用案例给出其VC 示例代码。     

基于Web的远程教学平台的设计与实现

本文介绍了一个基于Web的远程教学平台的设计与实现。该平台分为管理员模块、教员模块和学员模块等三个逻辑功能模块;物理实现上包括管理员子系统、个性化教学子系统、答疑子系统和考试子系统。个性化教学子系统采用适应性和智能技术动态生成个性化学习课件[1,2],答疑子系统采用了同步智能答疑的技术,考试子系统突破了只能文字出题的限制,引入视频、音频和复杂数学公式等各类题目。该平台在“计算机基础”课程中得到初步实现。     

基于Web的远程教学平台的设计与实现

本文介绍了一个基于Web的远程教学平台的设计与实现。该平台分为管理员模块、教员模块和学员模块等三个逻辑功能模块：物理实现上包括管理员子系统、个性化教学子系统、答疑子系统和考试子系统。个性化教学子系统采用适应性和智能技术动态生成个性化学习课件【1，2】，答疑子系统采用了同步智能答疑的技术，考试子系统突破了只能文字出题的限制，引入视频、音频和复杂数学公式等各类题目。该平台在“计算机基础”课程中得到初步实现。     

基于Web的远程教学平台的设计与实现

介绍了一个基于Web的远程教学平台的设计与实现。该平台分为管理员模块、教员模块和学员模块三个逻辑功能模块;物理实现上包括管理员子系统、自主学习子系统、答疑子系统和考试子系统等。答疑子系统采用了同步智能答疑的技术,考试子系统突破了只能文字出题的限制,引入视频、音频和复杂数学公式等各类题目。该平台在“计算机基础”课程中得到初步实现。     

A preliminary study of combining mass spectrometric data with audio and video signals for real-time monitoring of controlled lab-scale fires

The different aspects of sensors integration, and specifically that of a Mass Spectrometer (MS) with audio and video signals, are investigated for detecting and monitoring indoor fire events. The present study focuses on comparing the capabilities of a variety of chemical sensors, on answering technical challenges in regard to the integration of chemical, audio and video signals and on discussing integration issues for potential field applications. Controlled, small scale fire experiments were carried out in the laboratory. A commercial MS coupled with an in-house developed Pulsed Sampling System (PSS), was used for on-line sampling and near real-time monitoring of the evolved volatiles. The detection limit of PSS-MS was found to be 150 ppbv and its linearity was confirmed up to 10 ppmv using benzene gas standards. The profiles of ions with m/z 57, 78, 91 and 106, corresponding to indicative Volatile Organic Compounds (VOCs) of the fire event, were recorded and compared with the concentration profiles of CO₂, CO, O₂, NO and H/C (C₃H₈), acquired by the gas sensors of a commercial exhaust gas analyzer. Audio and video signals were recorded by a microphone and a visual camera, simultaneously, with PSS-MS data. Two types of fire experiments were performed in order to simulate field conditions: (a) direct fire monitoring, in case of unobstructed direct fire view and (b) indirect fire monitoring through reflection of audio and video signals on metallic surfaces, for simulating obstacles preventing direct fire view. The information derived by audio and video signals reaffirmed the chemical detection inferences for both types of fire experiments, thus increasing the credibility of each individual method. Occasionally, video, audio and chemical information were complementary, thus counterbalancing the detection limitations of the individual methods. The integrated approach of combining MS data with audio and video signals appears to be a promising method in safety and security applications, where reliable, early detection and real-time monitoring is necessary.     

The impact of online video lecture recordings and automated feedback on student performance

To what extent a blended learning configuration of face-to-face lectures, online on-demand video recordings of the face-to-face lectures and the offering of online quizzes with appropriate feedback has an additional positive impact on the performance of these students compared to the traditional face-to-face course approach? In a between-subjects design in which students were randomly assigned to a group having access to the online lectures including multiple choice quizzes and appropriate feedback or to a group having access to the online lectures only, 474 students (161 men and 313 women) of a course on European Law agreed to participate in the experiment. By using regression analysis we found that the course grade of the students was predicted by their grade point average, their study discipline, their grade goal for the course, the expected difficulty-level of the course, the number of online lectures they viewed, the number of lectures the students attended in person and the interaction between the lectures they viewed online and attended in person. Students who attended few lectures had more benefit from viewing online lectures than students who attended many lectures. In contrast to our expectations, the regression analysis did not show a significant effect of automated feedback on student performance. Offering recordings of face-to-face lectures is an easy extension of a traditional course and is of practical importance, because it enables students who are often absent from the regular face-to-face lectures to be able to improve their course grade by viewing the lectures online.     

Camtasia in the Classroom: Student Attitudes and Preferences for Video Commentary or Microsoft Word Comments During the Revision Process

In the last ten years, libraries, individual departments, and professors have experimented with screen-capture software to develop edited tutorials, record in-class lectures via presentation software, and record think-aloud rationale for difficult problem sets. Moreover, screen-capture software has been used to provide visual/audio feedback for student writing. Currently, there is scant research on visual/audio feedback via screen-capture software in writing courses. The present study examines student perceptions and attitudes about two different modes and media of teacher feedback: Microsoft Word comments versus visual/audio commentary. The results indicate that the mode and medium of teacher feedback had an impact on students’ perceptions about the rhetorical context of the revision process and perceptions about the teacher/student relationship. Students who preferred the visual/audio modality of the teacher commentary videos cited their conversational quality, clarification of expectations, and reference to more global issues in writing. On the other hand, students who preferred the Microsoft Word comments were more apt to discuss its indexical quality in that students could easily revise surface level features or locate the “problem” sentence. The results also indicate that an either/or approach to teacher feedback is not necessary. Students articulated the relevance of using a combination approach in which Microsoft Word comments and the teacher commentary videos could be used for different elements or stages of the writing process. As instructors transition to teaching within online contexts and experiment with new technologies, it is important to examine the significance of the mode and medium of teacher feedback in student perceptions, participation, and writing practices.     

The CARE platform for the analysis of behavior model inference techniques

ContextFinite State Machine (FSM) inference from execution traces has received a lot of attention over the past few years. Various approaches have been explored, each holding different properties for the resulting models, but the lack of standard benchmarks limits the ability of comparing the proposed techniques. Evaluation is usually performed on a few case studies, which is useful for assessing the feasibility of the algorithm on particular cases, but fails to demonstrate effectiveness in a broad context. Consequently, understanding the strengths and weaknesses of inference techniques remains a challenging task.ObjectiveThis paper proposes CARE, a general, approach-independent, platform for the intensive evaluation of FSM inference techniques.MethodGrounded in a program specification scheme that provides a good control on the expected program structures, it allows the production of large benchmarks with well identified properties.ResultsThe CARE platform demonstrates the following features: (1) providing a benchmarking mechanism for FSM inference techniques, (2) allowing analysis of existing techniques w.r.t. a class of programs and/or behaviors, and (3) helping users in choosing the best suited approach for their objective. Moreover, our extensive experiments on different FSM inference techniques highlight that they do not behave in the same manner on every class of program. Characterizing different classes of programs thus helps understanding the strengths and weaknesses of the studied techniques.ConclusionExperiments reported in this paper show examples of use cases that demonstrate the ability of the platform to generate large and diverse sets of programs, which allows to carry out meaningful inference techniques analysis. The analysis strategies the CARE platform offers open new opportunities for program behavior learning, particularly in conjunction with model checking techniques. The CARE platform is available at http://care.lip6.fr.     

嵌入式RMVB播放器音视频同步及其实现

随着计算机多媒体技术和嵌入式技术的发展,便携的嵌入式播放器也日渐流行。由于嵌入式设备资源有限,因此如何在有限的资源下实现多媒体音视频的同步是一个重要的讨论问题。目前关于多媒体格式音视频同步的研究都很多,但是关于RMVB格式在嵌入式设备上音视频同步的研究还很少,本文主要介绍了缓冲区和时间戳结合的音视频同步方案,在设计的嵌入式RMVB播放器中验证,该播放器可以达到流畅播放的效果。     

Integrating semantic analysis and scalable video coding for efficient content-based adaptation

Scalable video coding has become a key technology to deploy systems where the adaptation of content to diverse constrained usage environments (such as PDAs, mobile phones and networks) is carried out in a simple and efficient way. Content-based adaptation and summarization are fields that aim for providing improved adaptation to the user, trying to optimize the semantic coverage in the adapted/summarized version. This paper proposes the integration of content analysis with scalable video adaptation paradigm. They must be fitted in such a way that the efficiency of scalable adaptation is not damaged. An integrated framework is proposed for semantic video adaptation, as well as an adaptive skimming scheme that can use the results of semantic analysis. They are described using the MPEG-21 DIA tools to provide the adaptation in a standard framework. Particularly, the case of activity analysis is described to illustrate the integration of semantic analysis in the framework, and its use for online content summarization and adaptation. Overall efficiency is achieved by means of computing activity using compressed domain analysis with several metrics evaluated as measures of activity. Work supported by the Ministerio de Ciencia y Tecnología of the Spanish Government under project TIN2004-07860 (MEDUSA) and by the Comunidad de Madrid under project S-0505-TIC-0223 (PROMULTIDIS).     

Binding-time analysis for both static and dynamic expressions

This paper presents a specializer and a binding-time analyzer for a functional language where expressions are allowed to be used as both static and dynamic. With both static and dynamic expressions, data structures can be statically accessed while they are residualized at the same time. Previously, such data structures were treated as completely dynamic, which prevented their components from being accessed statically. The technique presented in this paper effectively allows data structures to be lifted which was prohibited in the conventional partial evaluators. The binding-time analysis is formalized as a type system and the solution is obtained by solving constraints generated by the type system. We prove the correctness of the constraint solving algorithm and show that the algorithm runs efficiently in almost linear time. Kenichi Asai, Ph.D.: He is a research associate at the Department of Computer Science, Faculty of Science, the University of Tokyo. He obtained his bachelors degree, masters degree, and doctor of Science from the University of Tokyo in 1990, 1992, and 1997, respectively. His research interests are in Programming Languages in general, in Partial Evaluation and Reflection in particular. He is a member of ACM, IPSJ, and JSSST.     

智能电网中虚拟化云计算的应用和安全技术分析

智能电网符合当前需求,意义重大。首先简单介绍了云计算和智能电网,并对云计算在智能电网中的应用做了阐述,然后主要对云计算的安全技术进行了分析。     

The Vidboard: A video capture and processing peripheral for a distributed multimedia system

This paper describes a network-based video capture and processing peripheral, called the Vidboard, for a distributed multimedia system centered around a 1-Gbit/s asynchronous transfer mode (ATM) network. The Vidboard is capable of generating full-motion video streams having a range of presentation (picture size, color space, etc.) and network (traffic, transport, etc.) characteristics. The board is also capable of decoupling video from the real-time constraints of the television world, which allows easier integration of video into the software environment of computer systems. A suite of ATM-based protocols has been developed for transmitting video from the Vidboard to a workstation, and a series of experiments are presented in which video is transmitted to a workstation for display.