Design and Implementation of Library Management System Based on ASP.NET

数字图书馆，作为是数字化与网络化不断发展的结果，以信息资源的加工、管理和传输为特征。数字图书馆利用多媒体的存取来实现远程网络传输，同时还能够实现智能化检索和跨库无缝链接等。从而实现了一种全新的信息服务。数字图书馆是传统图书馆上的延续，同时也是图书馆历史上的一个新的挑战。当然，数字图书馆的兴起也是一个机遇，能够让图书馆更好地服务读者，服务社会，服务国家。本文主要针对图书馆借阅统计及推荐书目系统的实际情况，研究图书馆借阅统计及推荐书目系统特点，并设计图书馆借阅统计及推荐书目系统的相关方案。 本系统主要采用信息技术和软件工程技术。利用了Microsoft公司的SQLServer作为主要的数据库平台...Digital library, which is the result of the development of digital and numerical method, is characterized by the information and transmission process. It achieves the Microsoft information service by means of multi-media access,telnet transmission, intelligent management retrieval and seamless link through different types of database. Digital library's rich intension and bright future of developme...学位：工程硕士院系专业：软件学院_软件工程学号：X201323192

Performance of different DCSK schemes over the UWB in- body channel

混沌调制(differential chaos shift keying,DCSK)技术应用于超宽带(ultra wideband,UWB)短距离传输系统具有潜在的优势。提出了分别基于多元DCSK(M-ary DCSK,M-DCSK)、调频DCSK(frequency modulation-DCSK,FM-DCSK)和QCS-DCSK(quadrature code shifted-DCSK)的超宽带无线体内传输系统,分析了提出的基于最新几种混沌调制的超宽带体内传输系统的BER(bit error ratio)性能,对影响基于混沌调制的超宽带体内传输系统性能的参数积分时间和保护间隔做了理论研究和仿真分析。通过设置不同的扩频因子,在体内信道下QCS-DCSK相比MDCSK及FM-DCSK能够确保更好的传输质量,且功率损耗更低。在给定扩频因子β和信号持续时间Tc时,存在能使QCS-DCSK系统性能达到最优的保护间隔。在设定扩频因子β、信号持续时间Tc和保护间隔Tg时,存在能够使FM-DCSK系统性能达到最优的积分间隔。Because of its characteristics,differential chaos shift keying( DCSK) system is well suited for wireless short-range communication system. Based on M-ary DCSK,FM-DCSK and QCS-DCSK respectively,the ultra wideband wireless in-body communication systems are proposed. By deeply analyzing main characteristics about these systems,studying and simulating factors such as guard interval and integration time which affect performance of ultra wideband wireless in-body communication systems based on M-ary DCSK,FM-DCSK and QCS-DCSK,some optimizations have been made for these factors. The BER performance of those three schemes demonstrates that QCS-DCSK can provide better communication quality and require lower power consumption compared to other two DCSK schemes. For given spreading factor β and duration time Tc,the simulation results of QCS-DCSK over in-body channel with different guard intervals show that the optimal guard interval can ensure the best performance of QCS-DCSK over the UWB in-body channel. With given spreading factor β,duration time Tcand guard interval Tg,the optimal integration interval can improve the performance of FM-DCSK over the UWB in-body channel.The National Natural Science Foundation of China(61271241;61001073)~

Effect of freezing and thawing on the flesh quality of cultured carp（Cyprinus carpio）during storage in ice

To elucidate the effect of freezing and thawing on the flesh quality of the cultured carp (Cyprinus carpio) during storage in ice, we examined the changes in ATP related compounds (K values %), expressible water (%), breaking strength (N/cm2) and histological observation. During storage in ice, the increasing speed of K value in the freeze-thawing group was 1.6-fold higher than the unfrozen group. In addition, the rate of expressible water in the freeze-thawing group was higher than the unfrozen group through the storage period, implying that the ice crystals produced by frozen were melted and effluxed to extracellular space. The breaking strength after freezing and thawing was lower than that of the unfrozen. Although the breaking strength of the unfrozen group was decreased with storage in ice, the breaking strength of the freeze-thawing group remained at low level until the end of storage period. These results suggest that the freezing and thawing processes deteriorate the flesh quality through the increase in the incresing ratio of K value and expressible water, and a decrease in breaking strength.本研究では，養殖コイを用いて未凍結群と凍結融解群を作製し，K値，圧出水分，破断強度，氷結晶の形成からみた凍結融解による魚筋肉の品質に及ぼす影響を検討した。未凍結群と凍結融解群のK値40％レベルまでのK値上昇率を求めたところ，凍結融解群は未凍結群よりも平均値レベルで1.6倍高かった。また圧出水分量は，凍結融解群では平均値レベルで常に未凍結群より高値を示し，特に保存初期（氷蔵０日目）では約２倍高かった。これは凍結により生じた氷結晶が融解し，細胞外に流出したためと考えられた。一方で破断強度は，凍結融解群では，保存初期（氷蔵０日目）から平均値レベルで未凍結群の６割程度の低値しか示さず，その後も同程度の低値であった。これは凍結で生じた氷結晶により細胞が破壊された影響によるものと考えられた。以上，本研究から，魚筋肉では凍結融解すると未凍結よりもK値上昇が速くなり，圧出水分が増え，破断強度が低下することが明らかとなった。すなわち，凍結融解した魚筋肉は鮮度低下が速くなるうえ，肉質が軟らかくなるという肉質劣化が起こると考察された