城市建筑风景照片的自动识别和分类

在数字照片的快速检索和浏览域中，需要对照片进行分类，但目前国内外学者对照片的分类的研究并不是很多。提出了一种如何使用图像的低级特征来表示高级语义分类的一种方法来对家度数字照片的进行分类，特别适合于有人工建筑或人工事物的图片。算法根据图像纹理点和边缘点的方向相位立方图来推断照片中是否存在人工建筑，从而达到对城市建筑风景和其它风景分类的目的。实验数据表明，分类效果非常好，算法己在Windows2000下使用VC实现，具有很强的鲁棒性。     

基于Agent的商务关系网模型

随着经济学的关系论转向,关系研究对于电子商务至关重要,本文通过对以Agent为中介的大规模开放电子市场中交易模式及社会性的分析,提出了一种包括买卖关系和朋友关系的通用商务关系网模型,对该模型进行了形式化描述,并给出了相应的形成和修正规则。     

基于微博扩展的用户兴趣主题挖掘算法

为解决基于微博的用户兴趣建模存在建模不全面的问题,提出一种基于微博扩展的用户兴趣主题挖掘算法。通过结合用户自身兴趣及用户关注人的兴趣来扩充微博用户兴趣,将兴趣分为长期兴趣、过期兴趣、近期兴趣,利用改进的TF． IDF算法分析相关微博内容,利用基于时间及文档频率加权的主题词重要度计算兴趣主题词得分,得出综合全面的用户兴趣。实验结果表明,综合分析用户及用户关注人的兴趣,可以有效得到真实、全面、包含潜在兴趣的用户个人兴趣。     

PSD光电自动瞄准系统

介绍了一种计算机控制的ＰＳＤ光电瞄准系统,分析了系统的组成、工作原理以及光电信号的处理方法。ＰＳＤ光电瞄准系统基本实现了导弹初始定向的自动化,其准直精度或方位偏差的测量精度可以达到２″,满足了系统的实际需要。最后阐述了瞄准系统的平台驱动电机的细分控制。     

分子束外延CdTe（211）B／GaAs（211）B的特性研究

ＣｄＴｅ／ＧａＡｓ是ＨｇＣｄＴｅ分子束外延的重要替代衬底材料。用Ｘ双晶衍射和光致发光测试研究了分子束外延生长的ＣｄＴｅ（２１１）Ｂ／ＧａＡｓ（２１１）Ｂ的晶体结构质量，表明外延膜晶体结构完整，具有很高的质量。用高分辨率的透射电镜研究其界面特性，观察到ＣｄＴｅ（２１１）Ｂ相对于ＧａＡｓ（２１１）Ｂ向着［１１１］方向倾斜一个小角度（约３°），界面的四面体键网发生扭曲，由于晶格失配，在界面存在很高的失配位错密度。用二次离子质谱分析仪分析了ＧａＡｓ衬底中的Ｇａ和Ａｓ向ＣｄＴｅ外扩散的情况。结果表明：如果要在ＧａＡｓ衬底上生长ＨｇＣｄＴｅ外延膜，必须先生长一层具有一定厚度的ＣｄＴｅ来阻止Ｇａ和Ａｓ向ＨｇＣｄＴｅ的外扩散和失配位错的延伸。     

Who wants to be “friend-rich”? Social compensatory friending on Facebook and the moderating role of public self-consciousness

The present research aims to provide insight into social compensatory friending on social network sites by investigating the effects of self-esteem and self-consciousness on number of friends in the context of Facebook use. It was hypothesized that Facebook users low in self-esteem, when compared with high-self-esteem individuals, would engage in friending more actively and thereby accumulate a large number of friends as a way to compensate for the deficiency in self-esteem. We also hypothesized that the relationship between self-esteem and number of Facebook friends would vary depending on the levels of public self-consciousness. Data were collected from a college student sample in the United States (N = 234) based on an online cross-sectional survey. The results supported the hypothesis on social compensatory friending, demonstrating a negative association between self-esteem and number of Facebook friends. Furthermore, the data yielded support for the hypothesized moderating role of public self-consciousness in social compensatory friending: the negative association between self-esteem and number of Facebook friends was significant only for Facebook users who are high in public self-consciousness but not for those who are low in public self-consciousness. Implications for understanding social network site users’ friending behavior in light of social compensation motives are discussed.     

An algorithm for friend-recommendation of social networking sites based on SimRank and ant colony optimization

We put forward an algorithm on friend-recommendation of social networking sites based on SimRank and ant colony optimization, which broadens the appliance of the algorithm in this academic question. The algorithm focuses on the existing relationships between the members as the initial measurement and constructs artificial ants’ completed routing graph. Finally, an ordered and limited list of personalized recommendations through recursive optimization is produced. In the end, we verify the algorithm's rationality and validity through simulation and the result shows that it can improve the precision of friend-recommendation.     

纳米TiQ/炭黑改性PET织物及其导电与光活性的表征

对聚对苯二甲酸乙二醇酯(PET)织物进行碱性水解预处理.通过浸渍法以十二烷基硫酸钠作为分散剂在原始的和经预处理的PET中加入纳米炭黑(CB1515和CB156),纳米二氧化钛(NTO)-NCBs(CB1515或CB156)混合物.以柠檬酸(CA)和次磷酸钠(SHP)分别为交联剂和催化剂,分别在预处理前后的PETs中加入NTO+CB1515和NTO+CB156作对比研究.结果表明,CB156比CB1515更能有效地降低样品的电阻率.加入NTO后,由原始PET所制样品比预处理PET所制样品具有更低的电阻率.然而,这与不加NTO所制样品结果相反.通过增加添加量和改善NCBs和NTO在织物中的分散均匀性,采用CA和SHP可明显降低样品的电阻率.发现NCBs与NTO的协同效应可提高预处理织物的紫外吸收.由原始PET中加入NCB和NTO所制样品比预处理的PET对亚甲基蓝降解具有更高活性.通过添加NTO或CA-SHP可提高活性,前者比后者更有效.     

Positive direct-mask stereolithography with multiple-layer exposure: layered fabrication with stair step reduction

In this paper, we explain a new stereolithography involving the separate use of liquid photoinitiator and a base resin (photopolymer resin without photoinitiator). First, the base resin is supplied as a layer, and then a mask pattern is drawn onto the surface with photoinitiator by inkjet printing. When the surface is exposed to a UV lamp, only the pattern drawn with the photoinitiator is cured. In this process, the photoinitiator acts as a positive mask. Also, the idea of multiple-layer exposure, which may enable stair step reduction and fabrication time reduction, is introduced. The proposed idea and method are implemented in an experimental stereolithography system and some experiments are conducted using the system. As a result, the effectiveness and feasibility of the idea and method are confirmed.     

Gender differences in Facebook self-presentation: An international randomized study

Facebook is a popular social network that can be used for self-presentation. In the current study we examined gender differences in Facebook self-presentation by evaluating components of profile and cover photos. We used evolutionary psychology—a theory which holds many assumptions regarding gender differences—to draw hypotheses. In order to eliminate the pitfalls of self-reported data, we analyzed public data presented in Facebook pages of a random representative international sample of 500 Facebook users. As hypothesized, profile photos on Facebook differed according to gender. Males’ photos accentuated status (using objects or formal clothing) and risk taking (outdoor settings), while females’ photos accentuated familial relations (family photos) and emotional expression (eye contact, smile intensity and lack of sunglasses). Cover photos, however, did not show most of these gender differences, perhaps since they serve only as a supplement to the self-presentation that appears in the profile photos. These findings demonstrate that evolutionary theory rooted in the past can help us understand new social tools of the future.