自适应服务组合中基于语义相似度及面向任务的服务发现算法(英文)

为了实现自适应和高效的Web服务组合, 提出了一种面向任务的服务发现算法. 将传统的服务组合过程划分为语义上的发现和功能上的匹配, 并将任务作为操作对象, 利用语义相似度从候选服务中寻找与给定任务相匹配的服务, 并生成对应的TWC图, 同时针对新服务设计更新算法. 将该方法应用到服务组合模型中, 搜索TWC图以得到一条最优的路径作为服务组合结果输出, 并能在服务失效时做出实时的更新以完成服务请求. 实验结果证明了算法的可行性和有效性, 也表明当最大搜索半径取2时, 服务数量和质量之间可达到平衡.     

基于Java多线程技术的聊天系统设计与开发

本文重点介绍了如何使用Java语言来制作一款类似QQ的聊天系统及其主要功能的实现思想。该软件使用到的主要技术有Java多线程并行同步控制机制、J2se-Swing组件、JDBC数据库连接技术等。     

Automatic tracing and segmentation of rat mammary fat pads in MRI image sequences based on cartoon-texture model

The growth patterns of mammary fat pads and glandular tissues inside the fat pads may be related with the risk factors of breast cancer.Quantitative measurements of this relationship are available after segmentation of mammary pads and glandular tissues.Rat fat pads may lose continuity along image sequences or adjoin similar intensity areas like epidermis and subcutaneous regions.A new approach for automatic tracing and segmentation of fat pads in magnetic resonance imaging (MRI) image sequences is presented,which does not require that the number of pads be constant or the spatial location of pads be adjacent among image slices.First,each image is decomposed into cartoon image and texture image based on cartoon-texture model.They will be used as smooth image and feature image for segmentation and for targeting pad seeds,respectively.Then,two-phase direct energy segmentation based on Chan-Vese active contour model is applied to partitioning the cartoon image into a set of regions,from which the pad boundary is traced iteratively from the pad seed.A tracing algorithm based on scanning order is proposed to accurately trace the pad boundary,which effectively removes the epidermis attached to the pad without any post processing as well as solves the problem of over-segmentation of some small holes inside the pad.The experimental results demonstrate the utility of this approach in accurate delineation of various numbers of mammary pads from several sets of MRI images.     

Custom-Fit Parenting: How Low- and Well-Accepted Young Adolescents Benefit from Peer-Related Parenting

Objective. The present study investigated whether longitudinal associations between peer-related parenting behaviors (facilitation of peer interactions, social coaching about peer problems) and peer adjustment were moderated by young adolescents’ peer status. Design. Participants included 123 young adolescents (mean age = 12.03 years; 50% boys; 58.5% European American) at Time 1. At Time 1 (summer before the middle school transition), parents reported on their facilitation of peer interaction opportunities and coaching strategies to a hypothetical peer exclusion situation; teachers reported on youth peer acceptance. At Times 1 and 2 (spring after the middle school transition), youth reported on peer adjustment (friendship quality, loneliness, peer victimization). Results. Peer acceptance (pre-middle school transition) moderated prospective associations between peer-related parenting and peer adjustment, yielding two patterns of associations. Parental facilitation predicted better friendship quality and lower levels of loneliness over time among youth with high peer acceptance, but not among youth with low peer acceptance. In contrast, parental social coaching predicted better friendship quality among youth with low peer acceptance, but lower friendship quality among youth with high peer acceptance. Conclusions. Not all forms of positive peer-related parenting are equally beneficial for all youth. Well-accepted youth may have the social opportunities to take advantage of parental facilitation, whereas low-accepted youth may have greater social needs and benefit from support in the form of social coaching. Implications of these findings are discussed in relation to the literatures on peer-related parenting and peer adjustment.     

基于结构方程模型的战略性新兴产业技术创新影响因素分析

为了探究战略性新兴产业技术创新的影响因素及其之间的关系,在对战略性新兴产业技术创新影响因素进行分析的基础上提出假设,构建战略性新兴产业技术创新影响因素的结构方程模型,结合问卷调查结果运用结构方程模型和因子分析法验证假设,结果表明政府干预、企业协同创新、高校及科研机构的参与、产业内组织单元的互搏意愿、关键资源、运营管理对战略性新兴产业技术创新有显著影响,其中政府干预、企业协同创新、高校及科研机构的参与、产业内组织单元的互搏意愿为主要影响因素,中介机构介入对战略性新兴产业技术创新没有显著影响。研究结论可为我国战略性新兴产业技术创新关键要素管理与控制提供指导和借鉴。     

三重螺旋模型及其在我国的应用初探

在知识经济背景下,三重螺旋模型强调"产官学"三方的互动关系。该模型指出,大学在经济和技术创新中应承担更多的任务,还主张通过"产官学"合作来推动知识发展和产业化。本文简要回顾该模型的主要内容和理论结构,并介绍国内相关研究和实践经验。基于此,本文认为三重螺旋模型形成于发达国家和高技术产业背景,在我国创新实践中应当谨慎地吸收和采用。     

计算机专业“专业导师制”项目的实践研究

计算机专业"专业导师制"项目是在课堂教学外实施的项目化专业实践活动.文章分析了专业导师制项目提出的背景、预期目标和实施原则,介绍了构建专业导师制的项目运作方式,以及项目实施的主要专业实践活动.     

大果圆柏的种子繁殖

我们推断大果圆柏是一种适合在拉萨地区生长的潜在的天然植被，为增加拉萨地区景观的多样性，改善拉萨地区生态环境，增加绿化树种都有重要而实际的意义。本文主要介绍了大果圆柏的种子繁殖试验及出苗期的管理情况。结果表明：在人工管理条件下，大果圆柏在拉萨地区用种子进行繁殖是可以实现的。     

我国粮食供求的区域特征及未来形势分析

我国是一个农业大国,也是一个人口大国,粮食生产问题非常重要。长期以来中国以较高的粮食自给率水平满足国内粮食需求,粮食安全状况逐步改善。但是,自2000年以来,粮食总产量出现连续4年减产,而且2003年降到4．3亿吨以下,使得这几年全国粮食当年     

巴基斯坦"骨干教师"项目改革述评

为提升教师教育的质量,巴基斯坦近年推出了"骨干教师"项目改革方案."骨干教师"承担三重角色:示范教师、教师教育者、教育改革的引领者.巴基斯坦的"骨干教师"项目对我们有多方面启示.首先,重视骨干教师的培养,鼓励其在教育改革中发挥重要作用.其次,在学校制度上赋予"骨干教师"更多参与学校改革的权利,激励他们积极投入学校发展.第三,"骨干教师"要得到学校领导层的支持,才能发挥社会影响力.