• Journal of KIISE:Information Networking
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• v.37 no.3
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• pp.217-227
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• 2010

To apply active RFID technology in the various kinds of industry, it needs to quickly transmit a large amount of data. ISO/IEC 18000-7 standard uses the 433.92MHz as single channel system and its transmit rate is just 27.8kbps, that is insufficient for a large amount of data transmission. To solve this problem, we designed a new data transmission protocol using 2.4GHz band. The feature of designed protocol is not only making over 255bytes data messages using the Burst Read UDB but also efficiently transmitting it. To implement this protocol, we use Texas Instruments's SmartRF04 develop kit and CC2500 transceiver as RF module. As an evaluation of 63.75kbytes data transmission, we demonstrate that transmission time of Burst Read UDB has improved as 17.95% faster than that of Read UDB in the ISO/IEC 18000-7.

• Proceedings of the Korean Society of Computer Information Conference
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• 2022.07a
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• pp.391-394
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• 2022

최근 한국을 포함한 여러 국가들에서 프로그래밍 교육이 중요시 되고 있다. 그러나 이런 상황으로 인해 더 많아진 학생들은 미숙함으로 인해 숙련자에 비해 더 많은 오류를 만나지만 이를 해결하기 위한 디버깅 실력은 아직 미숙하다. 따라서 본 논문에서는 프로그래밍 교육 지원을 위한 초보자용 GUI 디버깅 도우미 UDB (Unity-DeBugger)를 제안한다. UDB는 제출한 학생 코드를 분석하여 반응형 추적표와 오류 로그를 생성하고 이를 기반으로 GUI 및 애니메이션으로 만들어 학생과 상호작용한다. 특히 UDB는 반응형 추적표를 통해 프로그램 안에 있는 변수들의 현재 상태를 보여주고 순방향 추적뿐만 아니라 기존 IDE의 디버깅 도구들과는 다르게 역방향 추적이 가능하다는 큰 특징이 있다. 이런 UDB를 예시 코드에 실제로 적용한 결과를 통해 미숙한 학생도 역방향 추적 기능을 사용하여 오류 원인을 쉽게 찾을 수 있음을 보인다.

• Journal of Korean Society for Quality Management
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• v.30 no.3
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• pp.195-202
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• 2002

The problem of trend change in the mean residual life is great Interest in the reliability and survival analysis. In this paper, a new test statistic for testing whether or not the mean residual life changes its trend Is developed. It is assumed that neither the change point nor the proportion at which the trend change occurs is known. The asymptotic null distribution of test statistic is established and asymptotic critical values of the asymptotic null distribution is obtained. Monte Carlo simulation is used to compare the proposed test with previously known tests.

• Journal of Korean Society for Quality Management
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• v.30 no.4
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• pp.78-85
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• 2002

The problem of trend change in the mean residual life is great interest in the reliability and survival analysis. In this paper, a new test statistic for testing whether or not the mean residual life changes its trend is developed. It is assumed that neither the change point nor the proportion at which the trend change occurs is known. The asymptotic null distribution of test statistic is established and asymptotic critical values of the asymptotic null distribution is obtained. Monte Carlo simulation is used to compare the proposed test with previously known tests.

• the USERS
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• s.44
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• pp.44-49
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• 2005

• Proceedings of the KSR Conference
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• 2007.05a
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• pp.786-791
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• 2007

Korean high speed train(HSR-350x) has adopted a combined electrical and mechanical(friction) braking system. Brake blending control unit(BBCU) controls each brake system to fulfill the required brake performances such as braking distance, deceleration and jerk. Also the braking system should be designed considering the economical management, such as effective use of generated braking energy and the minimum wear of friction materials(a pad and a brake shoe). In this paper, we establish the disc braking force pattern that reduces the wear of pad in the disc braking system by minimizing the variance of the instantaneous disk baking energy during braking time, and compare the wear mass of pad between the conventional disc braking force pattern and the established results.