Recovering high dynamic range by Multi-Exposure Retinex

The matter of generating high dynamic range (HDR) image from a number of differently exposed pictures arises to satisfy the needs of high-quality imaging and industrial applications. A number of HDR image generation algorithms have been proposed in the past. However, the HDR radiance map recovered by these classical methods cannot completely exclude the noisy pixels in the input images and thus are unable to produce the optimal result with highest possible SNR. In this paper we are going to introduce a new HDR generation algorithm based on the Multi-Exposure Retinex model deduced in this paper for HDR image composition. The luminance component L and the reflectance R are synthesized independently before being combined together. A novel R image composition method is introduced to help the composed result image reach the highest possible SNR. The method is tested on grey-level images in this paper, but it can be easily extended to the color-image version.     

A Natural-Gas-Fired Thermoelectric Power Generation System

This paper presents a combustion-driven thermoelectric power generation system that uses PbSnTe-based thermoelectric modules. The modules were integrated into a gas-fired furnace with a special burner design. The thermoelectric integrated system could be applied for self-powered appliances or micro-cogeneration. A mathematical model for the integrated energy system was established that considered irreversibilities in the thermal-to-electric energy conversion process. The electric power output and electrical efficiency of the system were simulated using the established model. A prototype system was developed and its performance was investigated at various operating conditions. Applicability of thermoelectric devices to self-powered heating systems was demonstrated. The thermoelectric integrated combustion system could provide the consumer with heating system reliability and a reduction in electric power consumption. The integrated system could also offer other advantages including simplicity, low noise, clean operation, and low maintenance.     

Modeling the Building Blocks of a 10% Efficient Segmented Thermoelectric Power Generator

This paper describes the development of a modeling tool used for design and analysis of the building blocks of thermoelectric generators (TEGs). The described model captures the performance of a thermoelectric couple at varying loads and temperatures. The model includes the effects of interfacial resistances and other thermal losses. Validation experiments have been conducted, and the results are discussed. Once validated, the model was then used to design a 10% efficient segmented TEG, which was then built and tested. With this effective design tool along with improving thermoelectric material performance, a 14% efficient TEG is within reach.     

Exploring the evolution of digital television in China: An interplay between economic and political interests

This paper argues that the primary obstacles facing the transition to digital TV involve: (1) administrative infighting, (2) heavy-handed policymaking processes, and (3) the pursuit of self-interest and centralized control by the state network. After profiling China’s television infrastructure, the paper concludes that the Communist Party’s current policy initiative for the development of its digital television industry is not feasible.     

Technology standards-setting in the US wireless telecommunications industry: A study of three generations of digital standards development

This article focuses on the evolution of technology standards-setting in the US wireless telecommunications industry during the decades of the 1980s and 1990s. The purpose of this exploratory study is to understand and model the organizational process and environmental influences employed to develop three generations (i.e. second generation (2.0) Time Division Multiple Access (TDMA), second generation (2.5) Code Division Multiple Access (CDMA), and third generation (3.0) Wideband Code Division Multiple Access (WCDMA)) of de jure US wireless digital telecommunications standards. Through the use of a multi-case study approach, the research study focuses on inter-organizational strategic cooperation among wireless telecommunications firms proposing competitive technology designs in the standard development process. Based on data collected in these three case studies, wireless standard development models are “mapped” for the TDMA, CDMA and WCDMA technologies. Moreover, a generic, conceptual wireless technology standard development model is “mapped”, a further refinement of an earlier seminal model of telecommunications standard-setting. Finally, conclusions are reached, with both theoretical and practical implications, and suggested areas of future research (in the form of a set of research hypotheses) are presented.     

数字电路测试向量自动生成系统的比较

把遗传算法与蚂蚁算法运用于组合电路向量自动生成系统,并比较两者性能的优劣,根据实验结果进一步提出优化组合方案,将此方案应用于同步时序电路的测试向量自动生成系统中。提出一种优化的数字电路的测试向量自动生成系统。这个系统集合了蚂蚁算法和遗传算法的优点,使系统能在更短时间生成更小的测试集,而又能达到原先的故障覆盖率。     

超宽带系统数字基带处理器设计

本文研究基于多带－正交频分复用（MB-OFDM）技术超宽带系统的数字基带处理器设计。该数字基带处理器采用可配置多通路流水线结构实现高达480Mbps的数据率以及从53．3Mbps到480Mbps的多数据率模式。本文采用SMIC0．13um标准CMOS工艺进行芯片设计,芯片核心面积为5mm^2。设计的基带系统在典型室内多径信道环境下（CM1-CM4）进行了仿真验证,综合考虑多径衰落、加性高斯白噪声、以及±50ppm的载波频偏、采样频偏。仿真结果验证了系统的可行性和可靠性。     

具有新型电荷产生层的叠层有机发光器件

研究了采用薄层WO3作为叠层有机发光器件电荷产生层时的性能并对其厚度进行了优化,器件的电荷产生层由Li掺杂的电子注入层和高透明的WO3组成.研究表明,薄层WO3具有很高的透明度,并能有效地产生和注入空穴.叠层器件性能与单发光单元器件相比较,其亮度及效率均有大幅提高,叠层器件的最大电流效率达到了4.2 cd/A,在相同的电流密度下,叠层器件的效率约为传统器件的2倍;同时,电荷产生层的性能与WO3薄膜厚度密切相关,WO3薄膜厚度为3 nm时,器件的效率在整个电流范围内都保持稳定.采用薄层WO3作为电荷产生层为制备高效叠层有机发光器件提供了一条有效的途径.     

数字修调技术在高速高精度流水线ADC中的应用

数字修调技术采用MOS开关控制电路实现对修调数据的传输和电路拓扑结构的改变,相对于传统的修调技术,数字修调技术具有灵活性、可重复性和低成本等特点.基于0.35μmBiCMOS工艺,对采用数字修调技术的A/D转换电路进行仿真验证.结果表明,设计的A/D转换器,其SFDR达65 dB,INL和DNL分别达到0.35 LSB和0.26 LSB,采样率达到250 MSPS.     

用于流水线A/D转换器的改进型数字自校准算法

数字自校准算法在高精度流水线ADC中应用越来越广泛.目前,基于数字自校准算法的流水线ADC的结构一般都是1.5位/级.基于对各种结构优缺点的分析,选择在芯片功耗和面积方面有很强优势的2位/级结构,并设计了一种符合这种结构的改进型数字自校准算法.这种改进算法解决了目前数字自校准算法中校准参数不准确的问题,使校准输出后的数据准确度更高.实验结果表明,该改进型数字自校准算法使系统的线性度有了很大的提升.