丹江口水库渔业性能有关因子的聚类分析

利用丹江口水库1970～1990年的有关数据，采用系统聚类分析方法．形成聚类图和冰柱图．对结果进行了分析．表明：系统聚类分析方法能形象地反映对事物的影响及其程度．是定性的．但反映的现象一般不是唯一的；在低强度的渔政活动条件下．人为干预活动在聚类分析上得不到反映．效果不明显；而高强度的渔政活动条件下．人为干预活动在聚类分析上都将得到明确的反映．这似乎从另一个方面表明：对一个百万亩的大型水域．低强度的渔政活动对水域自身的影响是微不足道的；而高强度的渔政活动造成的影响将会凸现出来．     

A Monte Carlo Model of Light Propagation in Nontransparent Tissue

Opticalcoherencetomography (OCT)wasorigi nallydevelopedforimagingintransparenttissue[1] .Since1 995 ,OCThasbeenadvancedtoimagefromophthal mologytonontransparenttissuewithahighimagingres olution[2 ,3 ] .OCTdemonstratesitsgreatestpotentialinsituationswhereconventionalbiopsyiseitherdangerousorineffective[4] .Becauseofthecomplexityofthelightpropagationinnontransparenttissue,theapplicationofOCTinhighlyscatteringbiologicaltissuesuchasskintis suearenotoptimistic.Yadlowsky[5] explainedthatmul tip…     

Implications of Overlapping Difficulties in Mathematics and Reading on Self-Concept and Academic Achievement

In this study, the relationship between adolescents’ difficulty in mathematics and reading and the influence on academic self-concept and school grades was examined. The participants (N = 585; 299 girls, 286 boys) were one age group of ninth-graders whose mathematics and reading skills were assessed at the end of comprehensive school at age 16 years. Five student profile groups were found using cluster analysis: best achievers, normal achievers (NA), the reading difficulty (RD) group, the mathematical difficulty (MD) group, and the learning difficulty (LD) group. Post-hoc tests revealed that the RD group and the LD group had a higher academic self-concept than the MD group. In school grades history, surprisingly, the NA group and the RD group performed equally well across all school grades. Students in the MD group performed as poorly as the LD group. The results emphasise the prolonged and generalised effects of especially MD on students’ academic careers.     

计算机引导型病毒的防治初探

本文着重介绍计算机引导型病毒,从病毒的工作原理出发,介绍了病毒的几种检测、消除及免疫的方法.     

政府在产业集群的形成和发展中所起的作用

在全球化的背景下，产业集群成为推动地方经济莲勃发展的一个重要方面。本文探讨了政府如何对产业集群的形成和发展起到好作用，及在产业集群发展的不同阶段，政府应有的作用和行为。     

南沙港在珠三角港口群中的核心竞争力分析

提出港口核心竞争力的现实指标体系,并在此框架下对南沙港及其主要竞争对手进行对比,确定南沙港未来应该在服务能力方面加强核心竞争力建设。作为物流中心的南沙港,必须通过清晰的角色定位和营销推广以吸引船公司的合作,结合地区经济结构特点完善基础设施的建设,尤其是信息化和通关能力的建设,才能在港口竞争中树立不可替代的核心竞争力。     

论职业教育簇群式专业发展路径

结合宁波簇群经济特征,提出职业教育按照区域产业优势,形成有地方特色的职业教育专业群,通过专业集聚和提升,形成梯度差异的专业簇群,从而培育基于地方经济和簇群产业基础上的区域职业教育竞争力,以达到充分为地方特色经济培养技能型紧缺人才的目的.     

Using Greedy algorithm: DBSCAN revisited II

INTRODUCTION Clustering groups dataset data into meaning-ful subclasses in such a way that minimizes theintra-differences and maximizes the in-ter-differences of these subclasses; and is one ofthe most widely studied problems in data mining.There are many application areas for clusteringtechniques, such as statistical data analysis, patternrecognition, image processing, and other businessprocesses etc. Many clustering algorithms havebeen proposed, in part…     

河北省十一个地级市经济聚类分析

本文采用系统聚类的方法，将河北省11个地级市按照经济指标的相似程度进行聚类，划分为三个经济梯度区，通过分析区域差异的空间特征，提出了不同等级区域城市发展的对策。     

集群创新:从“学习型组织”到“创新型组织”

浙江绍兴纺织产业的竞争优势来源于持续的集群创新。绍兴纺织产业集群创新的经验对于我国各地产业集群的可持续发展大有启示:集群创新是产业核心竞争力的源泉,集群企业不仅要成为一个“学习型组织”,更要借助于集群创新环境成为一个“创新型组织”,只有在产业集群中不断创新才能塑造未来的长期竞争优势。