Incident Light Metering in Computer Graphics

Every rendering process consists of two steps. The first is the computing of luminance values by methods like ray tracing or radiosity, and the second step is the mapping of the computed values to values appropriate for displaying. In the last years, as alternative to simple linear scaling which maps the average value to the medium luminance, some new ways of mapping were introduced. These new methods are based on photography analogies and on human vision models. All existing methods follow, implicitly or explicitly, the reflected light metering principle. The method introduced in this paper is the first that follows the incident light metering used in professional photography and in the movie industry. Actually the irradiances are measured using a set of diffusors, which are placed automatically in the scene, and a linear scale factor based on these measurements is used to map the computed radiances to the display device. The diffusors act as half space integrators, they collect the light energy from all half space directions. The light comes from the primary light sources, or it is the result of various interreflections. The newly introduced method reproduces original colors faithfully even for scenes with very low or very high average reflectivity.     

Performance Analysis of the Spectral Correlation Discriminator Array

Mobile communications suffer from cochannel interference, adjacent channel interference and fading. The cell capacity or the number of users per cell is limited by the interference. In this paper we analyze a new blind adaptive array structure called the spectral correlation discriminator array (SCDA), designed to reject cochannel interference for advanced mobile phone service (AMPS) signals. The blind adaptive array exploits the spectral redundancy in the AMPS signals which arises due to the presence of the supervisory audio tone (SAT). SCDA is shown to provide an improvement of 25–30 dB in signal-to-interference plus noise ratio (SINR) in static multipath channels and 10–15 dB improvement of SINR in Rayleigh fading channels. The SCDA is compared to the least squares constant modulus array (LSCMA) and is shown to have better signal selectivity properties. The reduction in interference power can significantly reduce the frequency reuse factor.     

A Highly Reusable Code Assignment Approach with Modified Busy Tone Signaling for CDMA-Based Ad Hoc Networks

Medium access control (MAC) protocol is among the most active topics of research in ad hoc networks. With the CDMA-based MAC protocol the code allocation plays an important role and has significant impact on the protocol performance. In this paper, we propose a distributed CDMA code assignment protocol for the mobile ad hoc networks (MANETs). The protocol is mainly composed of (1) a modified busy tone signaling mechanism that protects on-going data transmission as well as distributes code usage information, and (2) a set of specially designed code selection rules that work by taking into consideration whether relevant nodes are in the transmitting or receiving state. By combining the two proposed schemes with the conventional request-to-send (RTS)/clear-to-send (CTS) dialogue and power control mechanism, our protocol is able to increase CDMA code reusability. The simulation results indicate that the proposed protocol indeed performs better than the static and dynamic code assignment methods (either with or without power control) in terms of successful transmission rate and successful code assignment rate. And instead of sending continuously, the proposed modified busy tone mechanism only issues busy tone signal in randomly selected cycles, which may save battery energy as compared to conventional busy tone implementations. Moreover, the proposed code selection rules and the modified busy tone signaling may also be integrated into existing MAC protocols, either separately or in combination.     

彩铃系统风险分析及安全性提升措施研究

彩铃系统作为成熟型增值业务,用户群庞大且对业务收入贡献较高。保证彩铃业务连续性和数据安全性是系统建设的重点。本文以移动某省彩铃系统为例,从彩铃平台的设备层、网络层、业务层逐层分析彩铃系统存在的风险。并以彩铃平台承载业务的重要程度对风险进行分级,提出安全性提升原则和具体方案。     

Analytical Solution and Numerical Simulation of Real-Time Dispersion Monitoring Using Tone Subcarrier

A method for online dispersion monitoring by adding a single in-band subcarrier tone isintroduced.According to the theoretical analysis,the dispersion monitor and measurement range aredetermined by the specific frequency of the subcarrier tone.By using simulation tools,figures aboutrelationship between power of subcarrier tone and transmission distance in ideal condition are shown.     

SPRO1010型氮氧置换仪在葡萄酒后处理阶段的应用

通过对使用SPRO1010型氮氧置换仪前后的葡萄酒在均质、下胶、冷冻、灌装等后处理过程中,其溶解氧、色度、色调、游离二氧化硫、总二氧化硫的对比跟踪检测,研究了溶解氧在各个工序处理中的变化规律,同时试验检测数据也为葡萄酒工业化生产中实现防氧隔氧的可控管理提供了重要参考.     

王季烈“主腔说”理论之探讨

著名昆曲理论家王季烈在《螾庐曲谈》中首次提出主腔说。主腔说的提出具有一定的时代意义和理论意义。后人在王季烈主腔说理论基础上,对其作了更详尽和科学的阐释,并放之于实际创作中,切实地解决了昆曲曲牌的联套问题。     

IPCC技术在呼叫中心集约化运营中的应用与实现

依据IPCC技术的特点,本文提出了一种快速提升电信运营商呼叫中心集约化业务运营能力的技术方法,并提供了具体的实施要点及相关内容.本技术在中国电信北方9省号百呼叫中心平台改造中的应用,充分验证了其可行性和有效性.其所蕴含的核心技术有效支撑了集中式、跨省资源调度呼叫中心的集约化运营,并第一次大规模应用于中国电信现网工程实施中,为中国电信节约投资成本上亿元,也为其他电信运营商呼叫中心平台升级提供了有益的借鉴.     

基于公众电话网的住宅远程智能报警和遥控系统设计

提出了一种价格低廉、功能齐全且具有遥控和家控两种操作方式的基于公众电话网的住宅远程智能报警和家电远程控制系统,既适合普通家庭使用,又可广泛应用于智能小区管理系统中.该系统具有较高的实用和推广价值.