The integration of image segmentation maps using region and edgeinformation

We present an algorithm that integrates multiple region segmentation maps and edge maps. It operates independently of image sources and specific region-segmentation or edge-detection techniques. User-specified weights and the arbitrary mixing of region/edge maps are allowed. The integration algorithm enables multiple edge detection/region segmentation modules to work in parallel as front ends. The solution procedure consists of three steps. A maximum likelihood estimator provides initial solutions to the positions of edge pixels from various inputs. An iterative procedure using only local information (without edge tracing) then minimizes the contour curvature. Finally, regions are merged to guarantee that each region is large and compact. The channel-resolution width controls the spatial scope of the initial estimation and contour smoothing to facilitate multiscale processing. Experimental results are demonstrated using data from different types of sensors and processing techniques. The results show an improvement over individual inputs and a strong resemblance to human-generated segmentation     

不同压紧件对IEGT工作表面压应力分布的影响

介绍了大功率器件IEGT在压装中,不同结构形式的压紧件对IEGT工作面压应力分布的影响,结合实例并通过有限元模拟及实验验证来确定压紧件的结构形式,以保证IEGT工作面压应力分布均匀,满足其在电力系统中使用要求。     

The working mechanism of organic photovoltaic cell by using copper phthalocyanine as exciton blocking layer

We demonstrate the working mechanism of organic photovoltaic (OPV) cell with copper phthalocyanine (CuPc) as exciton blocking layer (EBL). The new EBL material CuPc, commonly has been used as electron donor in the organic solar cells due to its electron-donating and hole-transporting properties. But here we proves that the α-polymorph CuPc layer can transfer electrons to Al cathode through the half-filled b_1g level, this mechanism is different from that of general EBL material with larger band gap and electron-transporting property, which is based on damage states induced by the heat of evaporating Al.     

Electronic word of mouth analysis for service experience

Since eWOM provides a rich source of objective information about products or services, it has become one of the major ways in which consumers collect information about items they are interested in buying. However, the problem of eWOM overload makes it difficult to effectively collect this information, and may have adverse effects on their actual purchase behavior. eWOM content is characterized by unstructured text formats, oversimplified expressions, and newly coined phrases (textspeak), and these all contribute to the challenges that arise when analyzing eWOM. This study thus proposes an eWOM analysis method for analyzing eWOM, which may lead to a more effective method for analyzing eWOM content, extracting both positive and negative appraisals, and help consumers in their decision making. At the same time, the method proposed in this study can also be utilized as a tool to assist companies in better understanding product or service appraisals, thus translating these opinions into business intelligence and as the basis for product/service improvements.     

高三学生心理压力过度归因与应对

在应试教育的背景下,许多中学片面追求高考升学率,家长也对子女抱有很高的期望,这给高三学生带来了沉重的心理压力.此外,严峻的就业形势、不良的人际关系及非理性的自我期许,使这种压力处于过度状态.要想解决这种困境,教师和家长应帮助学生理性认识高考与就业的关系,理性评价学生,为他们创建良好的学习氛围,鼓励同学之间加大交流.     

基于C8051F020的时间分辨荧光光谱测硼仪设计与实现

采用C8051F020研制了时间分辨荧光光谱测硼仪,以C8051F020为核心控制器;输出PWM信号控制脉冲光源发出激发光,使用ADC转换模块采集物质中硼元素发出的荧光信号,并根据采集到的数据,调整DA输出信号控制光电倍增管的负高压电源,使光电倍增管输出电流在合理范围内,从而提高采集数据的精度和准确度。通过RS232与PC通信,传送采集到的荧光信号数据至PC供后续处理。使用键盘和液晶显示屏,人机界面友好。实验表明,由于采用模块化设计,结构灵活,扩展性强,性价比高,具有很强的实用性。     

一类非均匀采样信号的数字谱

本文对实际采样过程中出现的一类非均匀、非理想采样信号进行了频谱分析,得到了此类信号的数字谱表达形式,并对非均匀采样周期信号的数字谱进行了深入的研究,得到了其数字谱完整的表达形式及其一些重要性质,最后,给出了该理论的一个应用一分析数字合成周期信号的频谱及信噪比．     

悬臂式RF MEMS开关的设计与研制

介绍了一种制作在低阻硅(3～8Ω·cm)上的悬臂式RF MEMS开关.在Cr/ Au CPW共面波导上,金/Si Ox Ny/金三明治结构或电镀金作为悬置可动臂,静电受激作为开关机理.当开关处于“关断”态,其隔离度小于- 35 d B(2 0～4 0 GHz) ;阈值电压为13V ;开关处于“开通”态,插入损耗为4～7d B(1～10 GHz) ,反射损耗为- 15 d B.另外,还分析了开关的悬臂梁弯曲度与驱动电压的关系,并应用ANSYS软件对开关进行了电学、力学及耦合特性的计算机模拟     

Threshold-based selective drop for shared buffer packet switches

We propose a novel buffer management scheme called threshold-based selective drop (TSD) to improve the overall loss performance and fairness by regulating the buffer sharing in a packet switch. A transient analysis of TSD is derived to prove the fairness of buffer allocation. Computer simulation shows that the overall loss performance of TSD approaches to the pushout (PO) scheme, which is considered as an optimal solution with implementation difficulties in high-speed Internet. However, unlike the PO, the TSD will block the unwanted packets before they enter the queue, and does not need to pre-empty the queue for accepting new packets.