Yoonsik Kwak

An Empirical Study on Agricultural Product Distribution Technology by Means of ICT Convergence

When it comes to the high distribution cost ratio of agricultural products, the major causes include lack of competition among distribution channels and inefficiency of distribution steps in addition to inevitable aspects such as the large volume and weight compared to the price, distance between producers and consumers, advanced types of consumption, gradual decomposition, and natural spoilage, the last two of which are primary factors that increase the distribution cost ratio. In general, agricultural products are vulnerable to supply shock, and thus price fluctuation rates are higher than those of industrial products. In particular, vegetables and fruits, which are difficult to keep fresh for a long period of time and easily affected by weather conditions, are of high price fluctuation rates. For these reasons, it is of urgent need to come up with ways to minimize natural spoilage and disposal in distribution of agricultural products. The suggested system provides various functions : a function to predict weight reduction of products during the storage and distribution process based on the analysis of data collected by the server to judge the level of quality deterioration.

An Empirical Study on Supporting System for Agricultural Product Storage Technology

Most of the existing agricultural product management systems based on ICT convergence are designed to trace the history of harvesting and distribution procedures or to monitor the growth process. ICT convergence management system needs to grow beyond the boundary of merely tracing the distribution history and monitoring growth environments; it should monitor environmental factors that affect agricultural products in the storage and distribution process, measure the level of deterioration based on the monitoring result, and thus reduce the rates of disposal due to quality deterioration. In addition, there should be a system to predict prices of agricultural products and to determine the best timing of sales so that farmers can sell goods at reasonable prices. This study relates the basic structure and functions of this system and presents the result of the empirical research project.

Case Studies on Distribution Environmental Monitoring and Quality Measurement of Exporting Agricultural Products

In this paper, we present monitoring the distribution environmental factors for exporting agricultural products in real time based on sensor networks and packaging technologies, and how the distribution environmental factors would influence the quality of agricultural products has been studied by measuring the actual quality of agricultural products when this distribution process has been completed. For this, sensor nodes and communication system, optimized to a monitoring process for the distribution environmental factors of agricultural products, have been designed and implemented. With the paprika exported to overseas, information on temperature/humidity/path (distribution environmental factors) has been monitored in real time. The possibility of utilization of sensor networks based distribution environmental factors monitoring technology could be verified through such case studies.

The Design and Implementation of a GPS-based Realtime Unmanned Driving System

This study is to design and implement an unmanned driving system that runs to a certain destination of the user in connection with a smart phone and Arduino. Once the departure and destination positions of the unmanned vehicle are set by means of a smart phone, it runs based on GPS information. This system is designed in a way that the monitoring and controlling are also possible by means of a smart phone. An Arduino-based unmanned vehicle is also designed and implemented

Design Multi-Band Microstrip Patch Antennas for Wireless Terminals

In this paper, the design methods of the multi-band terminal antennas by a single microstrip patch antenna are suggested. Also, to change the multi-band central frequencies, the feeding patch has the c- shaped slots. The multi-band microstrip patch antennas have been designed with the three-band central frequencies. Therefore, the proposed antennas in this paper can be applied for various kinds of a mobile communication applications, including a MIMO (multiple-input multiple-output) systems.

Flexible Capturing Application for Enhanced Generation of EPCIS Events

Radio frequency identification (RFID) technology and electronic product code (EPC) technology have been widely used to identify and keep track of physical objects. EPCglobal proposed the EPC network which consists of several components such as application level events (ALE) and EPC information service (EPCIS) to deal with the captured data from different layers. Many studies mostly concentrated on dealing with the RFID tag data in ALE, as well as querying and sharing EPCIS events in EPCIS. However, there is no well-known study on specifying how to generate higher level EPCIS events. The event types and semantic event fields are both uncertain for the capturing application to generate EPCIS events. Therefore, this paper proposes the flexible capturing application (FCA) to solve the problem that the event types and semantic event fields are both uncertain. FCA specifies generation rules about the four EPCIS event types. All the generation rules are matched for the incoming tag data to determine the event types. Event fields are generated with tag data and other sources of data after deciding event types. Thus, FCA can generate EPCIS events arising from supply chain activity. We evaluate our approaches by means of simulation and real experiments. Our experimental results indicate that FCA can be effective in processing EPCIS events data. We conclude with suggestions for future work.

Communication and Computation Overlap through Task Synchronization in Multi-locale Chapel Environment

Parallel processing systems use data parallelism to achieve high performance data processing. Data parallelism is normally based on data arrays, which are distributed to separate nodes. Therefore, efficient communication between nodes is required to initialize the distribution. In this paper, we propose a computation and communication overlapping technique to reduce the overhead of communication during array distribution. Our overlapping technique uses task parallelism for the initiate task and the worker tasks, and also the synchronization mechanism supported by Chapel. To show our overlapping technique is effective, we design and develop a parallel version of the Mandelbrot set program, and then evaluate the benefit of overlapping against the execution time of Mandelbrot. From our comparison, the overlapping technique proposed in this paper is effective in that it reduces the impact of communication in the initial array distribution.

Design and Implementation of the Application Service System Based on Sensor Networks

In this paper, we will take about the design and implementation of application service system based on sensor networks. As the components of application service system, we will take about middleware and its application services. There are 4 catalogues of module that consist of middleware, on the other hand, query processing module to deal with the requests from application service system, control module to control and manage meta data, module to connect with sensor nodes, and API solution to support user’s service. Based on the implemented middleware, in the high level of system, it is implemented service of system management, control service, and query processing service corresponding to happened events, and management and store service for sensing data.

Potentiality for Executing Hadoop Map Tasks on GPGPU via JNI

Hadoop has good features for storing data, task distribution, and locality-aware scheduler. These features make Hadoop suitable to handle Big data. And GPGPU has the powerful computation performance comparable to supercomputer. Hadoop tasks running on GPGPU will enhance the throughput and performance dramatically. However the interaction way between Hadoop and GPGPU is required. In this paper, we use JNI to interact between them, and write the experimental Hadoop program with JNI. From the experimental results, we show the potentiality GPGPU-enabled Hadoop via JNI.

Design of Novel On-Chip Antennas with Multi-band for UWB Applications

This paper presents novel on-chip antennas with a quintuple and sextet band so that it will be able to operate in the ultra wideband (UWB) applications. On the quintuple band antenna, the patch is consists of two trapezoidal slots which are symmetrical with U-slot near the coaxial feeding in the patch. And in the sextet band antenna, the patch antenna has a sector of circle shape 4-slots. The two types of substrate we have investigated for antenna design are the high resistivity silicon (HRS) and the thermal silicon dioxide SiO2. The return loss values obtained by simulation are compared with the measured antenna parameters. As a result, novel multi-band antenna structures for UWB application is proposed for a quintuple and sextet band application; C-band and X-band.