• Journal of Practical Engineering Education
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• v.14 no.1
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• pp.1-10
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• 2022

Learning C programming language in electronics education is an important basic education course for understanding computer programming and acquiring the ability to use microprocessors in embedded systems. In order to focus on understanding basic grammar and algorithms, it is a common teaching method to write programs based on C standard library functions in the console window and learn theory and practice in parallel. However, if a student wants to start a project activity or go to a deeper stage after acquiring some basic knowledge of the C language, using only the C standard library function in the console window limits what a student can express or control with the C program. For the purpose of making it easier for a student to use graphics or multimedia resources and increase educational value, this paper studies a case of applying Simple DirectMedia Layer (SDL), an open source software, into the C programming language learning process. The SDL-based programming course applied after completing the basic programming curriculum performed in the console window is introduced, and the educational value is evaluated through a survey. As a result, more than 56% of the respondents expressed positive opinions in terms of improved application ability, stimulating interest, and overall usefulness, and less than 4% of them had negative opinions.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.21 no.8
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• pp.1937-1947
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• 1996

In the case of developing the real-time system using object-oriented method, k the problem of the timing constraints is certainly considered. we propose the method of modeling the object-oriented real-time system using the OMT methodology and the SDL. And we also present the predictable time table that reflects the constraints of real-time system into dynamic model of OMTs and the predicatable time formula of the sequence, repeat, and parallel routine. The proposed method is applied to the estimate of the maximum process time of the ATMs(Automatic teller machines) and is used to specifying the functional specification for the user interface of the ATMs using the SDL syntax and the object interaction graph.

• Journal of KIISE:Computing Practices and Letters
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• v.8 no.4
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• pp.468-478
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• 2002

In this paper, we designed a B-WLL MAC(Media Access Control) protocol and validated its operation for implementation of high-speed subscriber networks. Our MAC protocol was designed by SDL using the DAVIC specifications based upon the variable contention/reserved time slot allocation algorithm. For validation of our MAC protocol, Syntax and semantic error check were performed by the Simulation Builder of ObjectGeode and the MAC(Message Sequence Chart) respectively. The validation results showed that our B-WLL MAC protocol is working correctly and may successfully support B-WLL services.

• Proceedings of the IEEK Conference
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• 2009.05a
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• pp.182-184
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• 2009

FlexRay is a new standard of network communication system which provides a high speed serial communication, time triggered bus and fault tolerant communication between electronic devices for future automotive and ship applications. FlexRay communication controller(CC) is the core of the FlexRay protocol specification. In this paper, we first design the FlexRay CC protocol specification and function parts using SDL(Specification and Description Language). Then, the system is re-designed using Verilog HDL based on the SDL source. The FlexRay CC system was synthesized using Samsung $0.35{\mu}m$ technology. It is shown that the designed system can operate in the frequency range above 80 MHz. In addition, to show the validity of the designed FlexRay system, the FlexRay system is combined with sound source localization system in Robot applications. The combined system is implemented using ALTERA Excalibur ARM EPXA4F672C3. It is shown that the implemented system operates successfully.

• Journal of Korean Academy of Fundamentals of Nursing
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• v.19 no.3
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• pp.334-342
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• 2012

Purpose: This descriptive study was done to identify the academic achievement, self-directed learning (SDL), and critical thinking disposition (CTD) of nursing students according to their learning styles. Method: The participants were 240 nursing students. Data were collected using structured questionnaires which included Kolb's Learning Style Inventory, Academic Achievement in Fundamental Nursing and Health Assessment, Self Directed Learning Readiness Scale, and California Critical Thinking Disposition Inventory. Data were analyzed using ${\chi}^2$ test, ANOVA, Pearson' correlation coefficients, and Spearman rank correlation coefficient. Results: One third of respondents were shown to be Convergers in their learning style (33.3%). The Academic Achievement of students who were Convergers was significantly higher than those who were Divergers or Accommodators (F=5.95, p=.001). The SDL and CTD of students who were Convergers were significantly higher than Divergers and Assimilators (F=9.67, p<.001 and F=8.42, p<.001). No significant correlations were found between Academic Achievement and SDL or CTD, but a statistically significant positive correlation was found between SDL and CTD (r=.68, p<.001). Conclusion: The findings of this study indicate that learning style influences academic achievement, SDL and CTD.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.45 no.6
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• pp.1-7
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• 2008

FlexRay is a new standard of network communication system which provides a high speed serial communication, time triggered bus and fault tolerant communication between electronic devices for future automotive applications. FlexRay communication controller (CC) is the core of the FlexRay protocol specification. In this paper, we first design the FlexRay CC protocol specification and function parts using SDL (Specification and Description Language). Then, the system is re-designed using Verilog HDL based on the SDL source. The FlexRay CC system was synthesized using Samsung $0.35\;{\mu}m$ technology. It is shown that the designed system can operate in the frequency range above 80 MHz. In addition, to show the validity of the designed FlexRay system the FlexRay system is combined with sound source localization system in Robot applications. The combined system is implemented using ALTERA Excalibur ARM EPXA4F672C3. It is shown that the implemented system operates successfully.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.45 no.8
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• pp.98-105
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• 2008

FlexRay is a high-speed communications protocol with high flexibility and reliability. It was devised by automotive manufacturers and semiconductor vendors and implemented as on vehicle LAN protocol using x-by-wire systems. FlexRay provides a high speed serial communication, time triggered bus and fault tolerant communication between electronic devices for automotive applications. In this paper, we first design the FlexRay communication controller, bus guardian protocol specification and function parts using SDL (Specification and Description Language). Then, the system is re-designed using Verilog HDL based on the SDL source. The FlexRay system was synthesized using Samsung $0.35{\mu}m$ technology. It is shown that the designed system can operate in the frequency range above 76 MHz. In addition, to show the validity of the designed FlexRay system, the FlexRay system is combined with automobile advance alarm system in vehicle applications. The FlexRay system is implemented using ALTERA Excalibur ARM EPXA4F672C3. It is shown that the implemented system operates successfully.

• Proceedings of the Acoustical Society of Korea Conference
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• spring
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• pp.291-294
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• 2004

본 논문에서는 Smith에 의해 제안된 이중 지연 라인을 갖는 양방향 디지털 도파관 모델을 SDL(sing1e delay line)모델로 변환하여 가야금의 단위 음이 만들어지는 과정을 나타내었다. 각 단계의 시스템은 선형적이며 단일 지연 라인과 LPF로 구성된다. 가야금의 임펄스 응답을 기본 입력신호로 하였으며. 실제 가야금의 조율 시스템인 안족은 선분 적합성을 이용한 근사화 과정을 거쳐 구현하였으며 이를 이용한 모의실험을 하였다. 실제 가야금을 조율하듯 안족에 의한 조율과 실제 음과 유사한 단위 음 생성을 할 수 있었다.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10c
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• pp.706-708
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• 2004

일반적인 무선 통신망은 데이터 전송 고속화에 중심을 두고 발전해 왔으나, 최근 무선 센서 네트워크와 같은 응용 분야에서 소량의 데이터와 낮은 처리 속도를 지원하면서 저비용, 경량, 저전력을 요구하는 무선 통신 기술이 필요하게 됨에 따라 IEEE에서 LR-WPAN(Low Rate-Wireless Personal Area Network)을 위한 새로운 IEEE 802.15.4 표준이 제시되었다. 현재 무선 센서 네트워크에 관한 연구는 소형 경량의 MAC(Medium Access Control ) 프로토콜 개발이 핵심 기술로 인식되면서, 저전력 소모를 위한 라우팅 기법, MAC 프로토콜의 패킷처리 기술 등이 우선적으로 진행 중이다. 그러나 무선 센서 네트워크와 같은 응용분야에 사용 가능한 표준인 IEEE 802.15.4 MAC 프로토콜의 실질적인 상용화를 위해서는 표준안 분석 및 검증 과정이 기본적으로 선행되어야 한다. 본 논문에서는 IEEE 802.15.4 표준안의 핵심인 MAC 프로토콜을 정형화된 명세 언어인 SDL(Specification and Description Language)를 이용하며 상세 설계 및 분석 후, 자동화 도구를 이용한 모의수행을 통하여 검증하였으며 표준안과의 비교 및 오류 수정을 거친 연구결과를 기술한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.25 no.7B
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• pp.1253-1259
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• 2000

적합성 시험은 프로토콜 구현물인 IUT(Implementation Under Test)가 프로토콜 규격과 일치하는지를 검증하는 것으로, 이 적합성 시험의 질은 생성된 시험열에 의존한다. 기존에는 시험열 생성이 수작업으로 이루어지기 때문에 오류의 가능성을 내포한다. 본 논문에서는 자동화된 툴(tool)인 Design/CPN을 이용하여 SDL(Specification and Description Language)로 기술된 프로토콜의 시험열을 생성한다. SDL로 기술된 프로토콜을 자료흐름을 고려한 CPN(Colored Petri Nets)으로 변환 후 Design/CPN에 입력하여 자동 생성된 OG(Occurrence Graph)와 디스크립터 (descriptor)로부터 시험열을 생성함으로써, 기존의 시험열 생성 방법에 비해 오류 가능성을 줄일 수 있으며, 자료 흐름이 고려된 시험열을 얻을 수 있다.