虚拟参考实时咨询系统分析设计及核心模块实现
摘要
北京邮电大学(北邮)在“十五”“211工程”建设期间,自主研发了一套具有北邮特色的数字图书馆集成服务系统。该系统包括虚拟参考咨询、信息门户、统一资源检索、数字资源管理、学位论文提交和网络信息采集等六个子系统,各个子系统在数据、功能、管理、系统等层面上有效地实现集成和链接。其中虚拟参考咨询系统包括实时咨询和非实时咨询部分,前者当时仅提供文字交流功能,不能满足读者需求。为此,本文在充分调研国内外虚拟参考咨询系统发展现状的基础上,结合系统需求分析,设计了一套功能完整的虚拟参考实时咨询系统,并分别阐述了各个模块功能和技术思想。考虑到音视频咨询是虚拟化的面对面咨询,是网络实时咨询的关键,作者基于JMF(Java Media Framework)和RTP技术,实现了具有音视频咨询、音视频在线录制以及音视频在线播放应用功能的音视频模块。为达到网络参考咨询零拒绝率的目标,作者基于手动调度策略和Java技术,实现了调度模块。上述模块均具有跨平台、B/S架构、多点交流的特点。最后,作者对系统的整个开发过程进行了总结,并展望了虚拟参考实时咨询系统的发展趋势。
During the period of the 10th five-year plan of 211 Project, Beijing University of Posts and Telecommunications (BUPT) developed independently a service system of a digital library with BUPT characteristics, which includes six sub-systems, such as Virtual Reference Consultant System (VRCS)、Information Portal、Unification Resource Retrieving、Digital Resource Management、Dissertation Submission and Network Information Collecting, and these six sub-systems are integrated with each other. Virtual Reference Consultant System is divided into two parts, real-time Consultant and non real-time Consultant. The contemporary VRCS of BUPT only had the text communication module in the real-time part, the real-time function is very simple, so it can't suit the consulter's requirement. So according the practical requirement of the real-time of VRCS and referencing the VRCS of the world, writer designed one VRCS which has the complete function, and expanded the function and technique of every module. Audio and video communication is the virtual face to face consult, and it is the key point for implementing the real real-time consult system, so writer implemented the audio and video consult module which contains real audio and video communication function、audio and video record function、audio and video presentation function, mainly using the technology of Java media framework (JMF) and RTP. For reaching the zero rejecting rate of VRCS, basing the hand dispatch strategy and Java technology, this paper implemented the dispatch module, solved the problem of consulter dispatch, and realized the collaborative reference consult further. The implemented modules above all have the cross-platform, B/S framework and multi-point communication characteristics.
Finally, writer concludes the whole developing procedure, and expand on the future developing tendency of VRCS.
During the period of the 10th five-year plan of 211 Project, Beijing University of Posts and Telecommunications (BUPT) developed independently a service system of a digital library with BUPT characteristics, which includes six sub-systems, such as Virtual Reference Consultant System (VRCS)、Information Portal、Unification Resource Retrieving、Digital Resource Management、Dissertation Submission and Network Information Collecting, and these six sub-systems are integrated with each other. Virtual Reference Consultant System is divided into two parts, real-time Consultant and non real-time Consultant. The contemporary VRCS of BUPT only had the text communication module in the real-time part, the real-time function is very simple, so it can't suit the consulter's requirement. So according the practical requirement of the real-time of VRCS and referencing the VRCS of the world, writer designed one VRCS which has the complete function, and expanded the function and technique of every module. Audio and video communication is the virtual face to face consult, and it is the key point for implementing the real real-time consult system, so writer implemented the audio and video consult module which contains real audio and video communication function、audio and video record function、audio and video presentation function, mainly using the technology of Java media framework (JMF) and RTP. For reaching the zero rejecting rate of VRCS, basing the hand dispatch strategy and Java technology, this paper implemented the dispatch module, solved the problem of consulter dispatch, and realized the collaborative reference consult further. The implemented modules above all have the cross-platform, B/S framework and multi-point communication characteristics.
Finally, writer concludes the whole developing procedure, and expand on the future developing tendency of VRCS.
引文
[1]房萍.基于网络的图书馆虚拟参考咨询系统的构建[J].现代情报,2007,27(9):180-181
[2]林中.参考咨询服务在美国的发展轨迹[J].图书馆论坛,2004,24(2):138-140
[3]段丽.国外数字参考咨询研究概况[J].现代情报,2006,(1):131-132
[4]赵金海,王洪志.美国数字参考咨询服务面临的技术挑战[J].情报杂志,2003(11):123-125
[5]Pagell,Ruth.Virtual reference librarian:usingdesktop videoconferencing for distance reference.Electronic Library,1996,14,(1):21-26
[6]Procter,Rob;Goldenberg,Ana;Davenport,Elisabeth.Genres in support of collaborative information retrieval in the virtual library.Interacting with Computers,1998,10(2):157-175
[7]Campi,MC;Savaresi,SM.Virtual reference feedback tuning for non-linear systems.2005 44th Ieee Conference On Decision And Control & European Control Conference,2005,1-8:6608-6613
[8]Nakamoto,M.An application of the virtual reference feedback tuning for an MIMO process.SICE 2004 ANNUAL CONFERENCE,2004,1-3:2208-2213
[9]Previdi,F;Ferrarin,M;Savaresi,SM;Closed-loop control of FES supported standing up and sitting down using Virtual Reference Feedback Tuning.Control Engineering Practice,2005,13(9):1173-1182
[10]Chen,C,Shao,ZR A.self-service digital virtual reference service system for college libraries.Proceedings Of The Eighth lasted International Conference On lnternet And Multimedia Systems And Applications,2004:70-74
[11]秦飞飞.基于虚拟参考咨询平台的数字参考咨询服务[J].图书馆论坛,2007,(4):109-111
[12]章靖平,史铁杰.高校图书馆虚拟参考服务的现状与发展[J].图书馆学研究,2005,(12):76-79
[13]吕青.1998-2003年我国图书馆网络参考咨询系统服务研究[J].图书馆建设,2004(4):38-40
[14]张晓林.数字化参考咨询服务[J].四川图书馆学报,2001,(1):34-40
[15]孙桂春,董莹.我国高校图书馆实时参考咨询服务现状分析[J].情报杂志,2006,(1):53-55
[16]马琳,莫梅琦,徐一新.国内外虚拟参考咨询服务现状分析与启示[J].中华医学图书情报杂志,2003,(5):6-7
[17]朱渝.实时参考咨询服务在国内开展的现状与分析[J].四川理工学院学报(社会科学版),2006,(1):113-114
[18]张旭,程文娟.虚拟参考咨询服务现状与发展趋势[J].情报杂志,2004,(5):115-116
[19]赵臣兵,刘立柱.基于RTP协议的视频实时采集与传输的研究[J].微计算机信息,2006(6):124-126
[20]赵莹莹,张兰芬.基于RTP协议的音频传输技术的研究与实现[J].现代电子技术,2006(10):30-38
[21]潘鹏,杜旭,叶婷等.RTP/RTCP实时传输协议的研究与Linux实现[J].计算机工程与应用,2006(24):105-107.
[22]胡廉民.基于RTP协议的实时语音传输性能优化研究[J].乐山师范学院学报,2007,(5):23-24
[23]杜根远,邱颖豫.基于RTP的实时音频传输系统研究[J].微计算机信息,2006(5):94-96
[24]赵进,叶梧,冯穗力.基于RTP协议族的流媒体系统设计和实现[J].计算机工程,2005,(02):195-197
[25]朱一群,朱秋萍.多媒体实时传输协议(RTP)的研究[J].计算机应用研究,2002,(10):89-91
[26]赵勇,曾珂,戴琼海.服务于流媒体的实时传输协议RTP[J].现代电视技术,2002,(04):32-34
[27]严俊,马小骏,顾冠群.RTP协议的研究与实现[J]计算机工程与应用,2000,(09):45-48
[28]杨曦,吴名星.基于RTCP包解析的音频QoS控制研究[J].福建电脑,2006,(09):110-116
[29]郭丽,龚声蓉.基于全局运动补偿编码的H.263编码器[J].小型微型计算机系统,2007,(05):915-917
[30]胡琳蓉,朱秀吕.一种适用于H.263的运动估计搜索算法[J].通信学报,2000,(06):66-70
[31]唐泽鹏,秦雷,朱秀昌,刘峰.适用于H.263(+)的一种运动估计快速搜索算法[J]江苏通信技术,2001,(05):10-13
[32]罗三定,孙薇嘉,沙莎.基于帧间运动估计的视频背景缺失信息恢复[J].计算机工程,2006,(08):235-237
[33]纪其进,董育宁.H.263的差错恢复视频编码及其在IP网络传输中的应用[J].电视技术,2002,(01):24-27
[34]乔光云,石翠仙,吕晓.G.723.1语音编解码优化方案[J].电子测量技术2007,(7):125-127
[35]王家庆,吴并臻.G.723.1语音编解码的DSP实时实现[J]中国数据通信,2005.(01):51-54
[36]陶洪,余艳梅,龙建忠.G.723.1语音编码算法的研究与实现[J]四川大学学报(自然科学版),2003,(01):64-67
[37]展华益,吴裕斌,曹丹华.ITU-T G.723.1语音编码算法的分析及优化[J]电声技术,2001,(12):54-57
[38]杨兴华,徐轶超,王伟志,蒋华.G.723.1语音编解码算法分析及DSP实现[J].北京电子科技学院学报,2007,(02):45-48
[39]Sun Microsystems,Inc.jmf API[DB/OL].http://java.sun.com/products/Java-media/jmf
[40]Sun Microsystems,Inc.jmf forum[DB/OL].http://forum.java.sun.com/forum.jspa?forumID=28
[41]Sun Microsystems,Inc.jmf examples[DB/OL].http://Java.sun.com/products/java-media/jmf/samples
[42]Convey Systems.Convey On Demand[DB/OL].[2006-09-11].http://www.conveysystems.com.
[43]OCLC.24/7 reference service[DB/OL].[2007-05-11].http://questionpoint.org.
[44]LivePerson,Inc.Live Chat Software[DB/OL].[2007-05-11].http://www.liveperson.com.
[45]孙一波,刘菁.大规模视频会议中的多人桌面共享系统的设计与实现[J].北京航空航天大学学报,2005,(8):139-141
[46]伊冬生.桌面共享组播软件的设计与实现[J].广州中山大学学报,2002,(4):20-24
[47]曲云鹏,张智雄,林颖.基于协同浏览的实时参考咨询系统的设计与实现[J].现代图书情报技术,2006,(10):12-15
[48]杜呈伟,李伟荣,吴国新.基于B/S的电子白板的设计与实现[J].计算机工程与设计,2006,(16):3021-3024
[49]刘姝玉,董改香,冯志祥.多媒体会议系统中电子白板的设计与实现[J].河北软件职业技术学院学报,2007,(9):58-60
[50]黄敏,林皓明,金毅.分布式联合虚拟参考咨询系统及其调度机制[J].图书馆自动化,2005,(4):18-20
[2]林中.参考咨询服务在美国的发展轨迹[J].图书馆论坛,2004,24(2):138-140
[3]段丽.国外数字参考咨询研究概况[J].现代情报,2006,(1):131-132
[4]赵金海,王洪志.美国数字参考咨询服务面临的技术挑战[J].情报杂志,2003(11):123-125
[5]Pagell,Ruth.Virtual reference librarian:usingdesktop videoconferencing for distance reference.Electronic Library,1996,14,(1):21-26
[6]Procter,Rob;Goldenberg,Ana;Davenport,Elisabeth.Genres in support of collaborative information retrieval in the virtual library.Interacting with Computers,1998,10(2):157-175
[7]Campi,MC;Savaresi,SM.Virtual reference feedback tuning for non-linear systems.2005 44th Ieee Conference On Decision And Control & European Control Conference,2005,1-8:6608-6613
[8]Nakamoto,M.An application of the virtual reference feedback tuning for an MIMO process.SICE 2004 ANNUAL CONFERENCE,2004,1-3:2208-2213
[9]Previdi,F;Ferrarin,M;Savaresi,SM;Closed-loop control of FES supported standing up and sitting down using Virtual Reference Feedback Tuning.Control Engineering Practice,2005,13(9):1173-1182
[10]Chen,C,Shao,ZR A.self-service digital virtual reference service system for college libraries.Proceedings Of The Eighth lasted International Conference On lnternet And Multimedia Systems And Applications,2004:70-74
[11]秦飞飞.基于虚拟参考咨询平台的数字参考咨询服务[J].图书馆论坛,2007,(4):109-111
[12]章靖平,史铁杰.高校图书馆虚拟参考服务的现状与发展[J].图书馆学研究,2005,(12):76-79
[13]吕青.1998-2003年我国图书馆网络参考咨询系统服务研究[J].图书馆建设,2004(4):38-40
[14]张晓林.数字化参考咨询服务[J].四川图书馆学报,2001,(1):34-40
[15]孙桂春,董莹.我国高校图书馆实时参考咨询服务现状分析[J].情报杂志,2006,(1):53-55
[16]马琳,莫梅琦,徐一新.国内外虚拟参考咨询服务现状分析与启示[J].中华医学图书情报杂志,2003,(5):6-7
[17]朱渝.实时参考咨询服务在国内开展的现状与分析[J].四川理工学院学报(社会科学版),2006,(1):113-114
[18]张旭,程文娟.虚拟参考咨询服务现状与发展趋势[J].情报杂志,2004,(5):115-116
[19]赵臣兵,刘立柱.基于RTP协议的视频实时采集与传输的研究[J].微计算机信息,2006(6):124-126
[20]赵莹莹,张兰芬.基于RTP协议的音频传输技术的研究与实现[J].现代电子技术,2006(10):30-38
[21]潘鹏,杜旭,叶婷等.RTP/RTCP实时传输协议的研究与Linux实现[J].计算机工程与应用,2006(24):105-107.
[22]胡廉民.基于RTP协议的实时语音传输性能优化研究[J].乐山师范学院学报,2007,(5):23-24
[23]杜根远,邱颖豫.基于RTP的实时音频传输系统研究[J].微计算机信息,2006(5):94-96
[24]赵进,叶梧,冯穗力.基于RTP协议族的流媒体系统设计和实现[J].计算机工程,2005,(02):195-197
[25]朱一群,朱秋萍.多媒体实时传输协议(RTP)的研究[J].计算机应用研究,2002,(10):89-91
[26]赵勇,曾珂,戴琼海.服务于流媒体的实时传输协议RTP[J].现代电视技术,2002,(04):32-34
[27]严俊,马小骏,顾冠群.RTP协议的研究与实现[J]计算机工程与应用,2000,(09):45-48
[28]杨曦,吴名星.基于RTCP包解析的音频QoS控制研究[J].福建电脑,2006,(09):110-116
[29]郭丽,龚声蓉.基于全局运动补偿编码的H.263编码器[J].小型微型计算机系统,2007,(05):915-917
[30]胡琳蓉,朱秀吕.一种适用于H.263的运动估计搜索算法[J].通信学报,2000,(06):66-70
[31]唐泽鹏,秦雷,朱秀昌,刘峰.适用于H.263(+)的一种运动估计快速搜索算法[J]江苏通信技术,2001,(05):10-13
[32]罗三定,孙薇嘉,沙莎.基于帧间运动估计的视频背景缺失信息恢复[J].计算机工程,2006,(08):235-237
[33]纪其进,董育宁.H.263的差错恢复视频编码及其在IP网络传输中的应用[J].电视技术,2002,(01):24-27
[34]乔光云,石翠仙,吕晓.G.723.1语音编解码优化方案[J].电子测量技术2007,(7):125-127
[35]王家庆,吴并臻.G.723.1语音编解码的DSP实时实现[J]中国数据通信,2005.(01):51-54
[36]陶洪,余艳梅,龙建忠.G.723.1语音编码算法的研究与实现[J]四川大学学报(自然科学版),2003,(01):64-67
[37]展华益,吴裕斌,曹丹华.ITU-T G.723.1语音编码算法的分析及优化[J]电声技术,2001,(12):54-57
[38]杨兴华,徐轶超,王伟志,蒋华.G.723.1语音编解码算法分析及DSP实现[J].北京电子科技学院学报,2007,(02):45-48
[39]Sun Microsystems,Inc.jmf API[DB/OL].http://java.sun.com/products/Java-media/jmf
[40]Sun Microsystems,Inc.jmf forum[DB/OL].http://forum.java.sun.com/forum.jspa?forumID=28
[41]Sun Microsystems,Inc.jmf examples[DB/OL].http://Java.sun.com/products/java-media/jmf/samples
[42]Convey Systems.Convey On Demand[DB/OL].[2006-09-11].http://www.conveysystems.com.
[43]OCLC.24/7 reference service[DB/OL].[2007-05-11].http://questionpoint.org.
[44]LivePerson,Inc.Live Chat Software[DB/OL].[2007-05-11].http://www.liveperson.com.
[45]孙一波,刘菁.大规模视频会议中的多人桌面共享系统的设计与实现[J].北京航空航天大学学报,2005,(8):139-141
[46]伊冬生.桌面共享组播软件的设计与实现[J].广州中山大学学报,2002,(4):20-24
[47]曲云鹏,张智雄,林颖.基于协同浏览的实时参考咨询系统的设计与实现[J].现代图书情报技术,2006,(10):12-15
[48]杜呈伟,李伟荣,吴国新.基于B/S的电子白板的设计与实现[J].计算机工程与设计,2006,(16):3021-3024
[49]刘姝玉,董改香,冯志祥.多媒体会议系统中电子白板的设计与实现[J].河北软件职业技术学院学报,2007,(9):58-60
[50]黄敏,林皓明,金毅.分布式联合虚拟参考咨询系统及其调度机制[J].图书馆自动化,2005,(4):18-20