29250801
The Case of Interactive Web-Based Course Development
Development of the web-based learning technology supports strong enhancement to the lifelong education. This paper introduces how to design and implement web-based courses by network technology. To adapt the learning custom of the online learner, we adopt interactive and easy-sharing instructional mode and pay more attention to the display attribute of the multimedia during the process of designing and development web-based courses. In the "Civil Law" instructional practice, we divide the learning process into five parts: independent learning, online question-answering, test and examination, case study and discussion, and mock trial.
10908543
Construct Teacher Community in E-Learning System
At present, most universities had completed the basic facilities and services of Information and Communication Technology (ICT), and installed e-learning system. What should be done to facilitate teachers' transition to employ ICT to their new teaching practices? We believe that virtual communities for Teacher Professional development (TPD) and socialization are supposed to be an excellent solution. We also deem that e-learning system could be a place for TPD as well as assisting teaching. In this paper, we present our past attempts, and the rationale behind the design of the Zjiao.Com virtual community.
39681871
Automated Cellular Modeling and Prediction on a Large Scale
We describe CHAMP (CHurn Analysis, Modeling, andPrediction), an automated system for modeling cellularsubscriber churn that is predicting which customerswill discontinue cellular phone service. We describevarious issues related to developing and deployingthis system including automating data access from aremote data warehouse, preprocessing, featureselection, model validation, and optimization toreflect business tradeoffs. Using data from GTE'sdata warehouse for cellular phone customers, CHAMP iscapable of developing churn models customized byregion for over one hundred GTE cellular phone marketstotaling over 5 million customers. Every month churnfactors are identified for each geographic region andmodels are updated to generate churn scores predictingwho is likely to churn in the short term. Learningmethods such as decision trees and genetic algorithmsare used for feature selection and a cascade neuralnetwork is used for predicting churn scores. Inaddition to producing churn scores, CHAMP alsoproduces qualitative results in the form of rules andcomparison of market trends that are disseminatedthrough a web based interface.
14518520
Design and Implementation of an Automated Microscope Stage
Optical microscopes remain keen instruments for scientific research nowadays. Widely used in hospitals and laboratories, such equipment helps people deal with various kinds of tasks, most of which, however, are both onerous and tedious; therefore, operations on these manually executed instruments are lengthily and subject to human errors. To alleviate this problem, we equip an optical microscope with two stepper motors and implement the automatic control of the microscope stage. This paper introduces the control system architecture and discusses in detail the development of the communication subsystem and the stepper motor controllers. Test results with a practical application are also provided to illustrate the performance of this system.
17604686
Enhanced high-performance distributed coordination function for IEEE 802.11 multi-rate LANs
To compensate for the effects of fading in wireless channels, IEEE 802.11 systems utilize a rate-adaptation mechanism to accomplish a multi-rate capability. However, the IEEE 802.11 distributed coordination function results in a fundamental performance anomaly in multi-rate networks; namely, when stations with different transmission rates collide, the throughput performance of the high-rate station is significantly degraded by the relatively longer channel occupancy time of the low-rate station. This study resolves this problem through the use of an enhanced high-performance distributed coordination function (EHDCF) protocol. While most existing solutions to the multi-rate performance anomaly problem have the form of simple contention-based protocols, EHDCF has two modes, namely a contending mode and an active mode. In the proposed protocol, new stations joining the network are assigned a contending mode, but switch to an active node (and are therefore permitted to transmit data packets) as soon as they have gained access to the channel. Having transmitted a data packet, the active node then selects the next transmission station in accordance with a probability-based rule designed such that the high-rate stations within the network receive a greater number of transmission opportunities than the low-rate stations. The simulation results show that the EHDCF protocol not only yields a significant improvement in the network throughput but also guarantees the temporal fairness of all the stations. Copyright q 2009 John Wiley & Sons, Ltd.
2854723
UTDallas at TREC 2008 Blog Track
Abstract : This paper describes our participation in the 2008 TREC Blog track. Our system consists of 3 components: data preprocessing, topic retrieval, and opinion finding. In the topic retrieval task, we applied Lemur IR toolkit and used various techniques for query expansion. In the opinion finding and polarization task, we employed a feature-based classification approach. Then re-ranking was performed using a linear combination of the opinionated score and the topic relevance score. Our system achieved reasonable performance in this evaluation.
37887576
Design and Application of GIS Software Platform Integrating with DSS Oriented to E-Government
Both Geographic Information System (GIS) and decision support system (DSS) are playing an important part in government affairs management or electronic government (E-government). But GIS and DSS are usually independently working the interactive relation between them is unsubstantial, so that application of E-government to GIS is inconvenient and inefficient. This paper puts forward a new idea for designing software platform based on integrative GIS and DSS according to target of E-government construction in China, introduces the function integration target, method and technical way in different levels of this platform. This paper has found a new way of GIS development oriented to E-government, and described successful application in a series of G-government project, such as General National Situation Information System, Flood and Drought Prevention Information Service System, West Development Information Service System and so on.