• Journal of The Korean Astronomical Society
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• v.29 no.spc1
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• pp.395-396
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• 1996

We developed a telescope control system called ASTROS for the VST1 and VST2, which are specially designed radio telescopes to make a survey and have a 60-cm main dish. ASTROS is designed on the distributed intelligence concept and structurized programming. The hardware of the system is composed of several intelligent devices connected with de facto standard interfaces and main control unit is PC. The program is coded in the C language and its structure is object oriented in order to make easy to replace the component devices. ASTROS is now running on two twin telescopes, VST1 and VST2. VST1 is installed at Nobeyama in Japan and VST2 is installed at La Silla in Chile. They are making a galactic plane survey in CO (J=2-1) with 9 arcmin beam semi-automatically.

• Journal of the Society of Naval Architects of Korea
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• v.57 no.2
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• pp.114-123
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• 2020

A high-order potential-based panel method based on Green's theorem, with piecewise-linear dipole strength on triangular panels, is formulated for the analysis of potential flow around a three-dimensional wing. Previous low-order panel methods adopt square panels with piecewise-constant dipole strength, which results in inherent errors. Square panels can not represent a high curvature lifting body, such as propellers, since the four vertices of the square panel do not locate at the same flat plane. Moreover the piecewise-constant dipole strength induces inevitable errors due to the steps in dipole strength between adjacent panels. In this paper a high-order panel method is formulated to improve accuracy by adopting a piecewise linear dipole strength on triangular panels. Firstly, the square panels are replaced by triangular panels in order to increase the geometric accuracy in representing the shape of the object with large curvature. Next, the step difference of the dipole strength between adjacent panels is removed by adopting piecewise-linear dipole strength on the triangular panels. The calculated results by the present method is compared with analytical ones for simple non-lifting geometries, such as ellipsoid. The results for an elliptic wing with zero thickness at finite angle of attack are compared with Jordan's results. The comparison shows reasonable agrements for the both lifting and non-lifting bodies.

• Journal of the Korean Society of Clothing and Textiles
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• v.32 no.3
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• pp.454-461
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• 2008

The object of this study was to investigate the attitudes toward the school uniforms with Hanbok image and design preferences for the improvement of the uniforms. Subjects were high school students wearing the westernstyle school uniforms. Questionnaires were distributed to 480 students and 400 responses among them were used for data analysis. Students replied to the questions about the attitudes toward the school uniforms with Hanbok image and the wearing of the uniforms, preferred design, and subjects' characteristics. Using the SPSS program, frequency and percent ratio of data were determined and t-test and $X^{2}$ test were performed. As the results, students' attitude toward the uniforms with Hanbok image showed to be positive, and girl students were more positive than boy students but they didn't want to wear the uniforms. It revealed that students wanted to be expressed Hanbok image in the uniforms partially and to be conceived their image warm, peaceful and smooth. It is concluded that the school uniforms with Hanbok image should be designed to display Korean traditional beauty and Hanbok image partially at the neckline or the end of the sleeve, keeping the shape of the westernstyle uniforms.

• The Journal of Korean Association of Computer Education
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• v.6 no.1
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• pp.19-28
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• 2003

In this paper, we propose a development methodology based on the component architecture to develop the LMS that follows ADL's SCORM standard, which is interested internally and externally in the e-learning contents standardization research. In like manner, we designed the SCORM core module and implemented the EJB component based on J2EE through the sugested methodology for the conversion of SCORM Conformance LMS, from iOneLMS which was developed based on distributed object component like JSP, EJB, etc. The SCORM component modules were implemented by three modules - content importing, course registering, and taking course and gathering the learning data. In the process of implementation, we used the part of the class library that was supported by the ADL and AICC again.

• The Korean Journal of Emergency Medical Services
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• v.9 no.2
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• pp.137-146
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• 2005

This research focused on studying the phenomena of activity injuries occurred in military service, the object of which is soldiering soldiers in army. I made a inquiry paper including 6 items such as injury frequency, athletic event when you are injured, injury pattern, injury part in body and injury time according to military classes, and distributed it to elected 421 soldiers, the number of which is the total number of injured soldiers having time for physical activities in a year(last 2002 year). The results were as follows ; First, Injury frequency was according to private middle classes, private second classes, private last classes, private first classes. Second, Athletic event when you are injured was according to soccer, basketball, running and Martial Art(Taekwondo). 1) An abrasion was the most injury pattern when playing soccer. 2) A sprain was the most injury pattern when playing basketball. Third, Most causes of injuries dued to his / her carelessness, which is his / her excessive greed to win. Fourth, The most injury pattern was a skin abrasion. Fifth, The most injury part in body was a leg. Sixth, There was the most injury in summer. Wednesday on week, especially afternoon when you have time for physical to improve your battle-power.

• IE interfaces
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• v.22 no.3
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• pp.278-286
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• 2009

The anti-collision algorithms to identify a number of tags in real-time in RFID systems are divided into the anti-collision algorithms based on the Framed slotted ALOHA that randomly select multiple slots to identify the tags, and the anti-collision algorithms based on the Tree-based algorithm that repeat the questions and answer process to identify the tags. In the hybrid algorithm which is combined the advantages of these algorithms, tags are distributed over the frames by selecting one frame among them and then identified by using the Query tree frame by frame. In this hybrid algorithm, however, the time of identifying all tags may increase if many tags are concentrated in a few frames. In this study, to improve the performance of the hybrid algorithm, we suggest an improved algorithm that the tags select a specific group of frames based on the earlier bits of the tag ID so that the tags are distribute equally over the frames. By using the simulation and mathematical analysis, we show that the suggested algorithm outperforms traditional hybrid algorithm from the viewpoint of the number of queries per frame and the time of identifying all tags.

• Korean Journal of Computational Design and Engineering
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• v.10 no.2
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• pp.143-150
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• 2005

A design framework to employ the multidisciplinary design optimization technologies on a computer system has been developed and is named as the Extensible Multidisciplinary Design Integration and Optimization System (EMDIOS). The framework can not only effectively solve complex system design problems but also conveniently handle MDO problems. Since the EMDIOS exploits both state-of-the-art of computing capabilities and sophisticated optimization techniques, it can overcome many scalability and complexity problems. It can make users who are not even familiar with the optimization technology use EMDIOS easily to solve their design problems. The client of EMDIOS provides a front end for engineers to communicate the EMDIOS engine and the server controls and manages various resources luck as scheduler, analysis codes, and user interfaces. EMDIOS client supports data monitoring, design problem definition, request for analyses and other user tasks. Three main components of the EMDIOS are the Engineering Design Object Model which is a basic idea to construct EMDIOS, EMDIOS Language (EMDIO-L) which is a script language representing design problems, and visual modeling tools which can help engineers define design problems using graphical user interface. Several example problems are solved and EMDIOS has shown various capabilities such as ease of use, process integration, and optimization monitoring.

• Proceedings of the Korean Information Science Society Conference
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• 1999.10c
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• pp.200-202
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• 1999

이벤트 서비스는 멀티미디어 통신, 전자상거래, 트래픽 제어시스템 등과 같은 대용량의 분산 응용 시스템에서 발생하는 이벤트의 전송을 제어하기 위한 서비스이다. 하지만 기본의 이벤트 서비스는 분산 환경의 실시간 응용 서비스를 지원하기 위해 필요한 실시간 이벤트 필터링, 우선순위, 마감시간 등과 같은 실시간 QoS 지원 기능들이 결여되어 있어 이를 지원할 수 있는 실시간 이벤트 서비스 처리 방안이 요구된다. 본 논문에서 제안하는 RTES는 기존의 ORB 구조에 이벤트 필터링, 실시간 매니저 및 QoS 저장소를 포함시킨 실시간 이벤트 서비스 미들웨어이다. 특히, RTES는 이벤트 사용자의 실시간 요구사항을 분산 실시간 응용에 반영시키기 위하여 이벤트 필터링 기능을 실시간 처리에 맞게 강화 시켜 기존의 시스템에서 지원하지 못한 사용자의 실시간 요구 사항을 지원하는데 중점을 두었다. 실시간 이벤트 필터링은 사용자로부터 원하는 실시간 요구사항과 사용자가 원하는 자신만의 이벤트 필터링 정보를 입력받아 QoS 저장소에 저장하고, 실시간 이벤트 발생 시 사용자가 입력한 정보를 반영한 필터링을 통해 이벤트를 처리하는 메커니즘으로써 사용자는 자신이 원하는 실시간 요구조건에 맞게 필터링된 이벤트 처리결과를 얻게 되어 궁극적으로 보다 높은 서비스(QoS)를 제공받게 된다. 또한 이 과정을 통해 불필요한 이벤트가 필터링 됨으로써 전체적인 네트웍 트래픽(traffic)을 감소시키는 효과를 가져온다.

• Journal of Sensor Science and Technology
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• v.11 no.4
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• pp.200-208
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• 2002

This paper represents the development of an array-type flexible tactile sensor using PVDF(polyvinylidene fluoride) film and flexible circuitry. The tactile sensor which has $8{\times}8$ taxels is made by using PVDF film and FPC(flexible printed circuit) technique. Experimental results on static and dynamic properties are obtained by applying arbitrary forces and frequencies generated by the shaker. In the static characteristics, the threshold and the linearity of the sensor are investigated. Also dynamic response of the sensor subjected to the variable frequencies is examined. The signals of a contact force to the tactile sensor are sensed and processed in the DSP system in which the signals are digitalized and filtered. Finally, the signals are integrated for taking the force profile. The processed signals of the outputs of the sensor are visualized on a personal computer, the shape and force distribution of the contacted object are obtained using two and three-dimensional image in real time. The reasonable performance for the detection of contact state is verified through the experiment.

• Korean Journal of Organic Agriculture
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• v.18 no.4
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• pp.489-509
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• 2010

The object of this study is to analyze marketing situations and to suggest developing issues for organic farming. Organic agricultural products (OAP) has been steadily grown by an annual 36.4 percent over the past ten years, and production of OAP took up 4.5 percent of the Environmentally friendly agricultural products (EFAP) in 2009. 9,403 farmers, cultivated area 13,343ha and production 108,810 M/T in Organic agriculture are respectively formed 0.8 percent, 0.8 percent and 0.6 percent of Korea agriculture in 2009. And production of livestock products to have been certificated from the year 2005 was over 10,000M/T in 2008. OAP is mainly distributed by direct marketing system. The market size of OAP is 188.5 billion in 2008 and has been grown by an annual 30.1 percent. The price difference between OAP and general agricultural products is about 65.8 percent. Several issues on the marketing system of OAP are as follows : overcost of OAP marketing socially, imbalance of supply and demand, absence of standard price, institutional insufficiency to marketing within wholesale market, retail price inflexibility of consumer's cooperative, and so on.