Changwan Jeon

A combined virtual and remote laboratory for microcontroller

This paper describes a web-based combined laboratory for a 8051 microcontroller-related experiment which is composed of a virtual lab and a real time remote laboratory. Authorized users are allowed to have access to both labs using a web browser. The virtual laboratory cooperates with the remote laboratory to help learners easily understand the principal concepts and the process of complex experimental operations about the 8051 microcontroller. The former is implemented by Java applets and Flash animations, and the latter network technologies such as web-based compilation and socket communication, which enables remote experimental devices to be controlled by local learners, compensating for the lack of reality in the virtual experiment. The proposed laboratory provides learners with almost all the same advantages as a real lab environment.

Implementation of a web-based hybrid educational system for enhancing learning efficiency of engineering experiments

To enhance the excellence, effectiveness, and economical efficiency in the learning process, we implement a creative hybrid educational system for engineering experiments where web-based virtual laboratory systems and distance education systems are properly integrated. In the first stage, we designed client/server distributed environment and developed web-based virtual laboratory system for electrical/electronic circuit experiments. The proposed virtual laboratory system is composed of three important sessions and their management system: concept-learning session, virtual experiment session, assessment session. With the aid of the management system every session is organically tied up together to achieve maximum learning efficiency. In addition, every activity done during the virtual laboratory session are recorded on database and will be provided to the learners as the printout report included their own experimental information and results. With this new system structure, the learners can compare theoretical and experimental data; develop their capability in designing and analyzing the circuits; and make use of auxiliary educational tools for understanding complicated concepts. In the second stage, we have implemented efficient and cost-effective distance laboratory systems for practicing electrical/ electronic circuits, which can be used to eliminate the lack of reality occurred during virtual laboratory session. The use of simple and user-friendly design allows a large number of people to access our distance laboratory systems easily. Thus, self-guided advanced training is available even if many expensive types of equipment will not be provided in the on-campus laboratories. During distance laboratory session, the learners change the settings of the input signal and the values of circuit elements, observe the output waveform from the web camera, and obtain image information regarding their experimental results. The proposed virtual/distance laboratory systems can be used in stand-alone fashion, but to enhance learning efficiency we integrated them and developed a creative hybrid education system for engineering experiments. Our hybrid education system provides interactive learning environment and a new approach for the delivery of engineering experiments.

A web-based virtual laboratory system for electronic and digital circuits experiments

To achieve an integrated environment for measurement and instrumentation, we designed and implemented a client/server distributed environment and developed a web-based virtual laboratory system for electronic and digital circuit experiments. Since our virtual laboratory system is implemented to describe the on-campus laboratory, virtual experimental data similar to real experimental data can be obtained through the system. In addition, our web-based virtual laboratory is designed to enhance the efficiency of both the learners and the educators. The learners will be able to achieve high learning standard and the educators save time and labor. The proposed virtual laboratory system is composed of three important sessions: Principle Study Session to explain the concepts and to simulate digital circuit operations, Virtual Experiment Session to provide interactive multimedia contents about the syllabus of off-line laboratory class, Assessment Session and Management System. With the aid of the Management System every session is organically tied up together to achieve maximum learning efficiency. Through our virtual laboratory, the learners will be capable of learning the theories related to electronic circuit experiments and the operation method of the experimental equipments such as multimeters, function generators, digital oscilloscopes and DC power supplies. Also, every activity occurred in our virtual laboratory will be recorded on the database and will be printed out on the preliminary report form. Finally, we have obtained several affirmative effects such as reducing the total experimental hours and the damage rate for experimental equipments.

The Construction of Remote Microcontroller Laboratory Using Open Software

A microcontroller can be considered a self-contained system with a processor, memory and peripherals. It is used in automatically controlled products and devices by programming. Therefore it is adopting with the essential subject in our department. We implemented a remote laboratory for 80196KC microcontroller. The remote laboratory provides functions with which learners can perform experiments by remote-controlling circuits and equipment related to experiments and practices on the Web and gets data and image information, so through it learners can make realistic experiments at any time and in any place. Although student can not physically touch any equipment, they can confirm the operation process of the 80196KC microcontroller by observing the result of experiment transferred through the web camera. The remote laboratory module based on Internet open sources such as JAVA Web start technology, FTP technology and Telnet technology in server-client environment can be implemented at low cost. It has the object of introducing remote experimentation, offering to students the opportunity to run a C code for 80196 KC microcontroller. Our remote Lab, therefore, is a useful tool that allows students to make real experiments with 80196 KC microcontroller. It will be used an auxiliary lab for teaching and learning microcontroller.

Education Embedded System for Remote Control

This study implemented a remote control system using PDA based on WINDOWS CE.NET. In existing remote control systems, the user generally controls remote objects and obtain data using a computer, which is a local system connected to the Internet, and the remote objects are connected to server computers. In order to control remote objects, the user has to have a computer, a space to use the Internet, and wired Internet. The system proposed in this study uses an embedded board as a server and PDA as a client. Thus, the user can control remote objects at any place as long as wireless Internet is available. In addition, because an embedded board is used as a server, the system has the characteristics of high performance and low power consumption. The proposed system provides not only remote control environment using PDA but also conventional control environment using a computer as a client. In case PDA is not available, remote objects still can be controlled from any place as long as there are wired Internet and a computer.

Graduation Project: Development of an Automation System for Filter Quality Test Using LabVIEW

This paper presents a system of automatic filter quality test for the filter activeness during the process of the filter production was embodied with LabVIEW server and conveyer system. The LabVIEW server is LabVIEWs function as web server which can be remote controlled during filter quality test through on web. The conveyer system is constructed with Conveyer, Network Analyzer and PC Camera. The LabVIEW server controls conveyer motor and sensor using DAQ card and controls Network Analyzer using GPIB card for measuring S parameter of filters. Moreover, PC camera is for monitoring the process of remote controlling during the filter test. And the data base construction from results of Network Analyzers measurement made possible to manage special information of filters.

Development of Contents Improving the Effectiveness of Self Learning, for the C Program Language

The web affords unique opportunities to assist students in learning. Due to the rapid proliferation of the web in recent years, many educators seek to improve the effectiveness of their instruction by providing innovative web-based course material to their students. In particular, many web-based educational contents are being developed. It helps to teach and train students. It is spreading widely due to repeated learning any time, any where. In this paper we implemented C functions and quizzes for checking comprehension of statements in a C programming lecture, developing scenario related concepts and algorithm comprehension. We used visual representation. The web-based contents were implemented as FLASH animations or Java applets.

A Design and Implementation of Embedded RFID Middleware System based SOA Environment Using .Net Compact Framework

This study designed and realized a new type of RFID middle-ware based on .NET Compact Framework platform using PXA255 embedded board and Windows CE as operating system. The proposed embedded RFID middle-ware system controls via LAN a number of RFID sensors using RS-232 as interface and was designed on the basis of components of each function necessary RFID middle-ware. Application module operating in the SOA environment analyzes the data received from the RFID sensors with the embedded RFID middle-ware and in turn performs appropriate business logic. Client module to be used by end users can use RFID information in database, by web method call of application.

A Novel Method for Performance Evaluation of Focused Ultrasonic Transducers

The characteristic information about an ultrasonic transducer is generally described by the ultrasonic R/F signal back from a reflector and its frequency characteristics in the data sheet. The information can, however, hardly assure that the focused ultrasonic transducer would produce well-focused sound fields which the performance of the transducer absolutely depend on. Therefore, we propose the measured size of focal spot and the reconstructed shape of effective focal zone in the focused sound field as novel measures for the performance evaluation of the focused ultrasonic transducers. The process of getting the both of the transducers is conducted by the implemented software including sound field scanning and virtual 3D reconstruction functions which requires the echo of a point reflector. The proposed method could effectively distinguish superior ones among many transducers made in the same specification and be also used to detect the performance degradation due to the aging of the transducers.