基于N32926与RT-Thread的嵌入式视频系统的设计与实现

以新唐公司的N32926开发板作为研究平台,实现了视频的实时采集播放。开发板以RT-Thread作为其操作系统。系统的视频通过OV7725摄像头进行采集,然后对图像数据进行H.264编码,最后将解码的YUV数据转成RGB格式显示。通过实验证明,整个视频采集和编解码显示的方法是可行的

人民币汇率预期、短期国际资本流动与房价

2015年8月，央行进行中间价形成机制改革，人民币汇率预期的波动增强，短期国际资本流动及房价随之呈现出不同的特征。文章探索了三者间的传导机制，发现人民币汇率预期升值会促进短期国际资本流入，而流入的短期国际资本对房价的影响却与汇率预期的波动强度有关。文章采用TVP-SV-VAR模型对2010年7月至2016年12月的月度数据进行了实证研究，发现在两次汇改后，汇率预期波动较大，人民币汇率预期升值冲击通过短期国际资本流动更多地作用于房地产的需求端，使房价加速上涨。基于在不同汇率预期波动条件下三者的互动关系特征，文章从人民币汇率预期管理、短期国际资本的管理和引导以及综合管理机制的建立的角度提出政策建议

A Truncated Sum of Processing-Times-Based Learning Model for a Two-Machine Flowshop Scheduling Problem

[[abstract]]Scheduling with learning effects has gained increasing attention in recent years. A well-known learning model is called “sum-of-processing-times-based learning” in which the actual processing time of a job is a nonincreasing function of the jobs already processed. However, the actual processing time of a given job drops to zero precipitously when the normal job processing times are large. Moreover, the concept of learning process is relatively unexplored in a flowshop environment. Motivated by these observations, this article addresses a two-machine flowshop problem with a truncated learning effect. The objective is to find an optimal schedule to minimize the total completion time. First, a branch-and-bound algorithm incorporating with a dominance property and four lower bounds is developed to derive the optimal solution. Then three simulated annealing algorithms are also proposed for near-optimal solution. The experimental results indicated that the branch-and-bound algorithm can solve instances up to 18 jobs, and the proposed simulated annealing algorithm performs well in item of CPU time and error percentage. © 2011 Wiley Periodicals, Inc.[[note]]SC

Website Evaluation of the Top 100 Hotels Using Advanced Content Analysis and eMICA Model

[[abstract]]This study analyzes the features offered by the websites of the top 100 independent hotels on four continents, as listed in Travel + Leisure in 2010. The study demonstrates the application of a modified extended Model of Internet Commerce Adoption (eMICA) technique for technical depth and content analysis for breadth as well as inferential statistics and perceptual mapping. The study assesses the presence of fifty-nine website features on the hotels' websites grouped according to the three eMICA stages of promotion, provision, and processing and also grouped in seven dimensions determined by the content analysis, namely, functionality, innovation, interactivity, marketing, navigation, online processing, and service. The results of website evaluation modeling suggest that (1) hotels in Asia have more of the features than those of the other continent, (2) Europe and Asia were the leading continents in website development depth based on the eMICA model, and (3) each continent's webpages were distinct as follows: (a) European hotel webpages emphasized online and multilanguage support, (b) Asian sites emphasized on real-time interaction services and privacy policies, (c) Africa's pages emphasized travel tips and weather information services, and (d) American hotel webpages led in Web 2.0 features.[[note]]SSC

[[alternative]]The planning and utilization of "resource areas for outdoor teaching" on the schoolgroud in an elementary school

[[abstract]]Due to the consideration that outdoor education can be taken inside and outsidethe schoolground and any resources on the schoolground need to have the functionof being used in teaching, this research chose one elementary school to investigate how the teaching function of the schoolground is enhanced and how the teachers taught on the schoolground. This research aimed at (1)the process of planning "the resource areas for outdoor teaching" on the schoolground in an elementary school and (2) the condition of teaching on the schoolground. In addition to theoretical analysis, the researcher used interview, questionnaire and document to get information.The researcher got the information about the process of planning the "resource areas" and the opinion of some teachers' by interview. When surveying how the teachers taught outdoors on the schoolground and what they thought of the planning, the researcher used questionnaire. To knowwhat the "resource areas" were like, the researcher analyzed the document. Furthermore, the researcher also made use of the approaches stated above for triple checking in order to raise the reliability of the data. Based on the finding,this study concludes: 1.There were two reasons for the principal to plan "the resource areas for outdoor teaching." One was to advocate the conception of teaching outdoors.The other one was to enhance the teaching function of of the schoolground. In this case, he convened some of the administrative staffs to do the job. They tried to keep the schoolground as what it was and designed a trail at last. After that, they encouraged all teachers to use the schoolground in teaching as possible as they could.2. The problem appeared to be the lack of the intentionto do the job, the ability of knowing what to do and other needed things while designing the trail.3. The administative staffs discovered 20 "resource areasfor outdoor teaching" by writing unit plans and then compiled a booklet.In other words, they not only told the teachers where to teach , but alsothey suggested which subjects to teach and which methods to use. 4. Planning " the resource areas for outdoor teaching" did not make all the teachers change their teaching habits.Most of them accepting the conception of teaching outdoors had already made it one of the teaching methods they were used to use. Besides, there were some teachers still only teaching in the classrooms. Whether or not the teachers treated teaching outdoors as a normalway of teaching, the reason why some of the teachers would not make use of schoolground for teaching was because of too many lessons that needed teaching.5.Most of the teachers arranged outdoor teaching on the basis of teaching goals and curriculum. They would give students as much experience of observation and measurement as possible. However it was not common to adopt interdisciplinary teaching and use work sheets or guide sheets. 6. In this case, every school subject had been taught outdoors, but science teaching used much more "resource areas for outdoor teaching" than other subjects did. Some teachers believed that all subjects could be taught by using the resources on the schoolground, while others presumed that science was the only subject suitable for outdoor teaching.7. Most of the teachers were satisfied with the resource areas that did help them a lot in teaching. However they did not think thatthe booklet was useful, and nor was the teaching demonstration.

Knowledge-Sharing Intention in a Virtual Community: A Study of Participants in the Chinese Wikipedia

[[abstract]]This study proposes a model for evaluating virtual community members' knowledge-sharing intention toward Chinese Wikipedia. The results of this study reveal that knowledge-sharing intention is influenced directly by attitude, subjective norms, and perceived behavioral control, whereas anticipated reciprocal relationships and enjoying helping are positively related to attitude; sense of self-worth and peer influences are positively related to subjective norms; and self-efficacy and resource-facilitating conditions are positively related to perceived behavioral control on knowledge sharing.[[note]]SSC

PERSPECTIVES ON THE PERFORMANCE OF SUPPLY CHAIN SYSTEMS: THE EFFECTS OF ATTITUDE AND ASSIMILATION

[[abstract]]The introduction of information systems into industry to enhance operational efficiency is a common business strategy. Introducing such information systems should be expected to enhance employee satisfaction if the systems work as expected. Based on previous studies of supply chain management (SCM) and using institution theory, and technology use and acceptance models, this study applies the lens of attitude and assimilation to explore employee behavior toward using SCM systems after implementation, as well as how employees' attitude and assimilation impact on the performance of the supply chain. Collecting data from employees in the relevant departments from selected companies through a survey and applying SEM in the analysis, the study finds that the employee's perceived ease of use, perceived usefulness, and the subjective norm (Theory of Reasoned Action) have a positive impact on their attitudes toward their use of the SCM systems. Furthermore, it was found that top management's positive beliefs and participation also have a positive impact on assimilation and SCM performance. Finally, it was found that attitudes toward the use of SCM systems impact upon information performance but not in other outcomes of SCM operations. Implications for research and practice are raised. This study contributes to the body of knowledge by adding to our understanding of the relationships among users' attitude, assimilation, and business performance at the post-adoption stage within the context of SCM systems.[[note]]SSC

Why are bloggers willing to share their thoughts via travel blogs?

[[abstract]]Since the success of Web 2.0 technology, travel blogs have played an important role for travellers when planning their trips because they usually consult articles published on travel blogs before deciding on their travel destination. However, past researchers have mainly focused on the study of blog participants instead of the bloggers themselves. Why bloggers are willing to share their thoughts on travel blogs seems to be an interesting and important topic. Our study shows that four positive factors including perceived usefulness, reputation, altruism, and trust influenced the attitudes toward sharing, which accounted for 54% of the variance. Another positive factor is the subjective norm, which influenced the intention on sharing via the travel blog, which accounted for 69% of the variance.[[note]]SC

Balancing the Load of BI Queries in a Cloud Computing Environment

[[abstract]]One of the most published programming models of cloud computing is MapReduce. Google MapReduce and Apache Hadoop MapReduce are various implementations of the model. On the other hand, with the rapid increase of data accumulated by organizations, Business Intelligence systems (BI) are implemented to support decision-making. BI queries sporadically require a huge amount of computation and storage capacity. This makes it a suitable candidate for the application of cloud computing. However, to the best of our knowledge, there have been no academic works devoted to the study of the issues of distributing BI data and operators to take advantage of MapReduce computation power. The research proposes a Greedy Allocation approach to resolve the issue. To demonstrate the feasibility of the proposed method, several BI queries designed in Business Content of SAP BIW module of ECC6.0 are used. The result reveals that the proposed method can find an effective plan in reasonable time compared to more exhaustive method.[[note]]SC