THE NOVEL COMMUNICATION ALGORITHM AND THE THROUGHPUT ANALYSIS FOR WIRELESS SENSOR NETWORKS

Aiming at the significance of the energy controls of wireless sensor networks, an economical energy consumption algorithm for wireless communicating in Wireless Sensor Networks (WSN) is presented. Based on the algorithm, the maximal system throughput of WSN is analyzed, and the upper bound of throughput of WSN is proposed and proved. Some numerical simulations are conducted and analyzed. The conclusions include that the transmitting radius of sensor node and the parameters of the energy cost function have significant influence upon the throughput, but the monitoring region radius has little influence. For the same transmitting distance, the more the hopping of information trans- mitting, the better the throughput of WSN. On the other hand, for the energy optimization of the whole WSN, the trade-off problem between the throughput capacity and the relay nodes is proposed, and the specific expression of relay hops that minimized the energy consumptions and the maximal throughput of WSN under the specific situation is derived.     

中国沿海地区城乡发展态势与土地利用优化研究

对沿海地区2010年、2020年两个时段的经济增长、建设用地需求进行预测与分析,提出了基准增长和高增长两种情景的城乡建设用地规模。其中高增长情景下的建设用地规模:2010年为1 056.9×104hm2,2020年为1 153.4×104hm2。1996～2004年,东部沿海地区建设用地年均增量为17.45×104hm2,为了确保建设用地的最大规模不突破,需要通过盘活存量土地、加大农村宅基地整理力度,使建设用地挖潜比率2010年达到3.7%、2020年达到9.3%。最后,从保障沿海地区土地资源安全的高度,提出统筹城乡协调发展和城乡土地优化利用的具体策略。     

建设高效节能的现代化南方电网

介绍南方电网的现状与特点，总结建设高效节能的现代化南方电网所取得的成绩，提出今后的发展策略和工程技术规划。     

Enablers and barriers to the use of ICT in primary schools in Turkey: A comparative study of 2005–2011

The purpose of this study was to reveal barriers encountered by Turkish primary school teachers in the integration of ICT, to propose potential enablers to overcome those barriers, and to compare the current status of ICT integration (in 2011) with the status of ICT integration in 2005. Part of the data for this comparison was gathered in 2005 as part of a doctoral study by Goktas (2006). A survey design was used to investigate the barriers and enablers. Data were collected from 1373 teachers from 52 schools in 39 provinces. The results indicate that ‘lack of hardware’, ‘lack of appropriate software materials’, ‘limitations of hardware’, ‘lack of in-service training’, and ‘lack of technical support’ were the most important barriers. The highest ranked enablers were ‘allocation of more budget’, ‘allocation of specific units for peer support’, ‘allocation of support offices and personnel for teachers’, and ‘offering higher quality pre-service training for ICT’. Other leading enablers were ‘supporting teachers to enable effective ICT use’, ‘having technology plans’, ‘offering higher quality and more quantity of in-service training’, and ‘designing appropriate course content/instructional programs’. Analysis of an independent t-test revealed that most barriers showed significant differences and most enablers showed moderate or low differences between teachers' perceptions of their situation in 2005 and in 2011.     

Autopoiesis vs. social autopoiesis: critical evaluation and implications for understanding firms as autopoietic social systems

The main objective of this study is to revisit the fundamental postulations of autopoietic self-production wrapped within the autopoietic six-point key and to investigate whether or not firms as specific social systems can be treated as autopoietic unities. In order to do so firms have to be defined as simple and composite unities whereupon their boundaries have to be clearly identifiable. The test of social autopoiesis reveals that firms can be viewed as autopoietic social systems that exist in the communicative space with employees' firm-specific communicative sub-domains as their components. Furthermore, it is argued that the social reification of autopoiesis (autokoinopoiesis) in firms is quintessentially interconnected with physical autopoiesis of their employees (autophysiopoiesis). Discontiguous focus on productivity as firms' obvious physical implication may thus be upgraded by a very social nature of ideactivity, firms' only real survival force.     

Requirement-aware strategies for scheduling real-time divisible loads on clusters

This paper investigates the real-time scheduling problem for handling heterogeneous divisible loads on cluster systems. Divisible load applications occur in many fields of science and engineering. Such applications can be easily parallelized in a master–worker fashion, but pose several scheduling challenges. We consider divisible loads associated with deadlines to enhance quality-of-service (QoS) and provide performance guarantees in distributed computing environments. In addition, since the divisible loads to be performed may widely vary in terms of their required hardware and software, we capture the loads’ various processing requirements in our load distribution strategies, a unique feature that is applicable for running proprietary applications only on certain eligible processing nodes. Thus in our problem formulation each load can only be processed by certain processors as both the loads and processors are heterogeneous. We propose scheduling algorithms referred to as Requirements-Aware Real-Time Scheduling (RARTS) algorithms, which consist of a novel scheduling policy, referred to as Minimum Slack Capacity First (MSCF), and two multi-round load distribution strategies, referred to as All Eligible Processors (AEP) and Least Capability First (LCF). We perform rigorous performance evaluation studies to quantify the performance of our strategies on a variety of scenarios.     

Friend or not to friend: Coworker Facebook friend requests as an application of communication privacy management theory

Given that Facebook.com is a social networking tool used by a diverse audience, this study employs Communication Privacy Management (CPM) theory as a framework to investigate how working professionals respond to co-worker Facebook friend requests. Overall, 312 individuals with full-time jobs and Facebook accounts completed an online survey. Results confirmed that most working professionals accepted co-worker Facebook friend requests. However, request decisions varied in conjunction with organizational privacy orientation, current Facebook privacy management practices, and co-worker communication satisfaction. Results confirm that working professionals’ Facebook linkage choices with other co-workers are best understood when embedded within a framework which provides a more complete understanding of the functioning of their privacy rules. Future research examining working professionals’ social media privacy management practices when individual privacy norms contradict organizational privacy norms is discussed.     

凝结水精处理再生系统改造的控制系统设计

凝结水精处理装置的安全、稳定运行对于锅炉的给水质量起着关键作用.对嘉兴发电厂凝结水精处理原有控制系统进行了升级改造.改造后的硬件配置增加了1套65160控制器、1台远程I/O站、1台工控机及相关网络配件,从而组成双机双网冗余控制系统:工程软件设计保留原有程序的设计风格,增加了新增设备的控制逻辑和数据,并整合到原控制程序中;监控画面中添加了新增设备的控制画面、标签数据库等,并整合优化到原监控画面;系统网络也进行了重新规划.改造后的系统投运至今,运行效果良好,值得其他项目借鉴.     

Water infrastructure in China: the importance of full project life-cycle cost analysis in addressing water challenges

To address serious wastewater challenges, the government of China is investing in the rapid building of new treatment plants across the country. However, current practice often favours both cost- and energy-inefficient designs and implementation, especially in smaller cities and towns. Combining a full life cycle costing (LCC) approach with financing innovations and the identification and implementation of new technologies can reduce such inefficiencies by 50% or more. One general and two wastewater-specific case studies of new approaches to efficient infrastructure design are discussed.