Energy conservation through resource-aware movement in heterogeneous mobile ad hoc networks

Energy conservation in mobile ad hoc networks is of paramount importance because most mobile nodes usually have very limited energy supply. Previous research on this issue focused on the design at the network or MAC or physical layer. In this paper, we study this problem from the new perspective of node mobility, i.e., analyzing the impact of node movement on energy conservation. In particular, armed with the inherent resource heterogeneity in mobile ad hoc networks, we propose a novel resource-aware movement strategy to make better use of some powerful nodes to achieve energy conservation. We also formulate the resource-aware movement as a NP-complete distance-constrained least-cost (DCLC) routing problem and propose an efficient heuristic solution. Extensive simulations have been used to demonstrate the effectiveness of the proposed schemes.     

铝钢异种金属CMT焊接变形研究

针对目前使用冷金属过度焊（CMT）对铝钢异种金属薄板进行焊接时,存在焊接质量差,焊接热变形及使用性能低等缺点,对薄板件焊接过程采用SYSWELD软件进行模拟。通过不同的试验参数进行组合,得出金属薄板在X,Y以及整体方向上的焊接变形量,分析不同焊接参数对焊接热变形的影响规律。结果表明：在达到焊接要求的前提下,应尽量减少焊接时间和焊接电流;在一定焊接电压范围内,焊接电压越大,相同时间内焊接变形量就越大,Y方向焊接变形值约为X方向的1.5倍;为了避免焊接变形量过大,宜选用相对较大的焊接速度。     

晚清民初苏籍译家群的生发及地域文化缘由

晚清民初在西方文化与科学的译介和传播方面,苏籍译家作出了重要贡献.他们具有家国天下的胸怀,为拯救民族危难、改善社会民生、启迪民智寻找良方.他们立志翻译事业,译笔间传达出对民族兴衰成败的使命感.基于史料的爬梳与总结,聚焦晚清民初时期典型的苏籍译家的译事、译著,审视他们的翻译贡献,并从地域人文传统的视角进一步窥探苏籍译家群生发的地域缘由.     

Online monitoring of high-dimensional binary data streams with application to extreme weather surveillance

With the rapid development of modern sensor technology, high-dimensional data streams appear frequently nowadays, bringing urgent needs for effective statistical process control (SPC) tools. In such a context, the online monitoring problem of high-dimensional and correlated binary data streams is becoming very important. Conventional SPC methods for monitoring multivariate binary processes may fail when facing high-dimensional applications due to high computational complexity and the lack of efficiency. In this paper, motivated by an application in extreme weather surveillance, we propose a novel pairwise approach that considers the most informative pairwise correlation between any two data streams. The information is then integrated into an exponential weighted moving average (EWMA) charting scheme to monitor abnormal mean changes in high-dimensional binary data streams. Extensive simulation study together with a real-data analysis demonstrates the efficiency and applicability of the proposed control chart.     

市场经济条件下医院营销策略分析

文章从医院营销的概念入手,分析了医院营销中存在的误区,提出了医院营销的策略,并指出了医院营销的未来发展趋势。     

浅谈企业税收筹划及运用

税收筹划是指企业在税收政策允许的前提下,以追求效益最大化为目的,通过对企业生产经营、投资、理财等活动的事先筹划和安排,尽可能地节约税款,以获得最大的税收利益。其运用主要在以下几个方面:组建过程,投资决策过程,生产经营过程,对外筹资及股利分配过程。     

论中国近代高等理科课程的形成与发展

从洋务运动时期、维新运动时期、辛亥革命时期、抗日战争和解放战争时期四个方面论述了中国近代高等理科课程的形成与发展,从而看出近代中国已经初步形成了以传授自然科学知识为主、具有现代特征的高等理科教育体系。     

语域与翻译

英语在其运用过程中,要求在分清语域的前提下使用得体的语言。得体语言的掌握和运用需要具有选择语域的能力,领悟不同语域差异的认知能力,以及处理好不同语域中恰当对应词的翻译能力。     

试论英文杂志《天下月刊》的文化价值

英文杂志《天下月刊》于1935年8月在上海创刊、由中国知识分子主办。作为一份全英文期刊,它倡导中西文化交流的理念,着力将中国文化译介传播到国外。作为作品发表的园地与文化交流的载体,《天下月刊》刊载了大量文化评论与文学译文,具有丰富的文化与文学价值,并为中国文学尤其是现代文学向外传播开拓了先河。     

邦联国会与美国西部土地政策的制定

人们对美国历史上的邦联国会一直评价不高。但在西部土地立法问题上,邦联国会发挥了主导性作用,充分体现出它作为全国合法性政府在早期国家构建中的地位和能力。此外。邦联国会对西部土地的立法。从法律上确定了新建州“在一切方面均享有与原有诸州平等的地位”的联邦主义建州原则,这是美国日后领土扩张的根本原则。