• The Journal of Korean Institute of Communications and Information Sciences
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• v.39B no.2
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• pp.123-132
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• 2014

In this paper, an IEEE1588 based clock synchronization technique for CAN (Controller Area Network) is presented. Clock synchronization plays a key role to the success of a networked embedded system. Recently, the IEEE1588 algorithm making use of dedicated chipsets has been widely adopted for the synchronization of various industrial applications using Ethernet. However, there is no chipset available for CAN. This paper presents the implementation of IEEE1588 for CAN, which is implemented using only software and CAN packets without any dedicated chipset. The proposed approach is verified by the comparison between the estimated synchronization precision with a simple model and the measured precision with experimental setup.

• Proceedings of the Korea Multimedia Society Conference
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• 2001.06a
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• pp.295-298
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• 2001

전자책(eBook)은 디지털 매체를 이용해 책의 내용을 저장 및 가공한 출판물을 의미하며 저장의 용이성과 휴대가능성 및 검색 등의 장점을 가지고 있다. 이러한 장점을 가진 전자책은 아직 전용 소프트웨어가 미비한 상태이며 먼저 전자책을 저작하는 전용 편집기의 개발로 먼저 전자책의 저작이 이루어져야 한다. 본 논문은 장르별 구조를 제공하는 폼 기반(Form-based)의 전자책 편집기를 제안하며 특히 전자책의 특성상 사용자가 기본적으로 제공되는 폼에 더하여 구조를 동적으로 추가할 수 있는 유연성 있는 폼을 지원하는 시스템을 구현하였다. 본 편집기는 국내 전자책의 표준 포맷인 XML(extensible Markup Language)을 기반으로 하였다. 따라서 본 시스템에서 제공되는 폼으로서 사용자는 XML 구조의 숙지 없는 쉬운 인터페이스와 사용자의 의도에 따른 구조 제공으로 장르별 전자책을 작성하기에 용이하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10c
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• pp.703-705
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• 2001

전통 EDI(Electronic Data Interchange) 문서는 VAN(Value Added Network) 전용망을 통하여 EDI 서비스를 하였다. 하지만, 이것은 실시간(real-time)으로 문서를 처리하는 방식보다 주로 배치(batch)방식으로 한꺼번에 문서를 처리하였으며 전용 소프트웨 어를 사용함으로써 새로운 문서를 처리할때마다 새 문서에 대한 정보를 등록하고 소프트웨어를 다시 설치 해야하는 불편함도 있었다. 기존의 전통 EDI 문서는 VAN을 통하여 처리하는 방식이었으나 현재는 인터넷에서 EDI 문서를 볼 수 있도록 하기 위해 XML(extensible Markup Language)을 이용하고 있다. 인터넷기반의 웹 브라우저 상에서 볼 수 있는 XML/EDI 구현에 힘입어 여러 문서로 분리되어진 EDI 문서를 XLink의 개념을 이용하여 문서의 삽입, 삭제 기능과 이러한 문서를 통합하여 하나의 문서로 데이터베이스에 저장할 수 있는 방법에 관하여 연구하고자 한다.

• Proceedings of the Korean Information Science Society Conference
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• 2000.10c
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• pp.213-215
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• 2000

디지털 신호처리 알고리즘의 구현은 속도나 메모리의 사용측면에서 고정 소수점 구현이 필요하다. 특히, 정수형 연산 프로세서에서는 소프트웨어에 의한 부동 소수점보다는 고정 소수점 구현이 훨씬 성능이 뛰어나다. 디지털 신호처리 알고리즘의 복잡함과 일반 프로세서의 처리능력의 부족으로 이제까지는 신호처리 알고리즘의 실시간 구현을 위하여 대개 전용 프로세서나 디지털 신호처리를 위한 전용 명령어가 하드웨어적으로 구현되어 있는 프로세서를 사용하여 왔다. 하지만 현재 범용 프로세서의 주파수 속도가 빨라짐에 따라 복잡한 디지털 신호처리 알고리즘을 실시간에 처리할 수 있게 되었다. 하지만 정수형 연산 프로세서에서의 부동 소수점 연산은 프로세서에서 실시간 처리에 많은 어려움을 주게 된다. 본 연구에서는 데이터 타입이 고정된 범용 정수형 연산 프로세서(ARM RISC 32bit CPU)를 가지고 부동 소수점 연산 알고리즘을 고정 소수점 연산형으로 바꾸어서 속도측면과 메모리 측면의 성능을 비교해 보았다.

• The Journal of Korean Association of Computer Education
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• v.21 no.6
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• pp.63-82
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• 2018

In the 2015 revised curriculum, software (SW) education was strengthened to cultivate computational thinking. In the curriculum of practical course at elementary school and of informatics course at secondary school, the characteristics, and content systems of SW education have developed systematically. However, it is necessary to study practical methods and cases for SW education because the curriculums provide only note and direction about teaching & learning, and evaluation methods for SW education. The purpose of this study is to analyze the achievement standards of the SW curriculum in the tasks of Bebras Challenge 2017 and to suggest various methods of teaching and learning, and of evaluation using the Bebras tasks. The results of this study are expected to propose a basis to develop various teaching and learning and evaluation researches.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.24 no.3
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• pp.435-440
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• 2020

The application of the unmanned vehicles in various fields has been attracting attention, and the development of a service utilizing unmanned vehicles has been proceeding. As the service market using the unmanned vehicles rapidly increases, the demand for the development of software for performing the mission with unmanned vehicles is increasing. In particular, as the demand for unmanned vehicle utilization services for public missions such as fire detection, mail delivery, and facility management increases, the importance of developing mission software for unmanned vehicle is increasing. To develop common mission software, architecture design should be made so that unmanned vehicle service provider can easily develop software using reusable libraries or functions through analysis commonly required by various public institutions. In this paper, we discuss the research trends of mission software for public mission unmanned vehicles. In addition, the architecture design of developing formal mission software is proposed. Finally, we propose a data transfer architecture between mission software and data platform.

• KIPS Transactions on Software and Data Engineering
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• v.10 no.10
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• pp.391-398
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• 2021

Since the leased line is a structure that exclusively uses two connected areas for data transmission, a stable quality level and security are ensured, and despite the rapid increase in the number of switched lines, it is a line method that is continuously used a lot in companies. However, because the cost is relatively high, one of the important roles of the network operator in the enterprise is to maintain the optimal state by properly arranging and utilizing the resources of the network leased line. In other words, in order to properly support business service requirements, it is essential to properly manage bandwidth resources of leased lines from the viewpoint of data transmission, and properly predicting and managing leased line usage becomes a key factor. Therefore, in this study, various prediction models were applied and performance was evaluated based on the actual usage rate data of leased lines used in corporate networks. In general, the performance of each prediction was measured and compared by applying the smoothing model and ARIMA model, which are widely used as statistical methods, and the representative models of deep learning based on artificial neural networks, which are being studied a lot these days. In addition, based on the experimental results, we proposed the items to be considered in order for each model to achieve good performance for prediction from the viewpoint of effective operation of leased line resources.

• Journal of the Korean Institute of Telematics and Electronics
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• v.20 no.2
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• pp.7-15
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• 1983

In recent years, the logic circuits of high function have been developed to VLSI by the radical advancement of semi-conductor technologies. Under the above influence, it has become possible to design the special VLSI chips for high speed of numerical value processing, wide-band, image processing, etc. And, the development of the VLSI from various kinds of software package has become quite possible. This paper is to propose the technical skill of hardware design about general software package (BMD). The decrease of speed of former statistics processing caused by depending on software only is improved by hardware. In regard of design algorithm, the main system will be able to be established by considering of special feature of statistics. As a result, the complexity of software package is excluded by hardware. And, the efficiency is improved by high speed processing.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.39 no.10
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• pp.11-20
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• 2002

This paper proposes a hardware/software codesign of the MLSE equalizer for GSM.GPRS systems. We analyze algorithms of the MLSE equalizer which consists of a channel estimator using the correlation method and the Viterbi processor. We estimate the computational complexity requirement based on the simulation of TI TMS320C5x DSP. We also estimate the gate count from the results of logic synthesis using the samsung 0.5㎛ standard cell library (STD80). Based on the results of the complexity estimation and gate count, we propose the efficient software/hardware codesign of the MLSE equalizer based on the results of the complexity estimation and gate count.

• Journal of Digital Convergence
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• v.10 no.11
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• pp.225-234
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• 2012

OSS(Open source software) pursues the freedom to have access to open source and offers several advantages, over the proprietary software, to enterprises. Based upon Rogers(1995)' innovation-diffusion process, we assume that attributes of innovations includes five characteristics of innovations: relative advantage, compatibility, complexity, trialability, and observability, and that firms' perceptions of these characteristics predict the rate of adoption of OSS. To test this hypothesis, we presents a survey result from 201 companies and institutions concerning the use of OSS. Statistical analysis shows that adoption is highly correlated with each of those characteristics of innovations, but the regression analysis indicates that only compatibility and observability have effects on the adoption of OSS. This implies that intrinsic value of OSS is important, but unless the appropriate service package for improving IT environment is provided, it is not easy to change the perspective of corporate customers more favorable toward OSS use. As a conclusion, the academic and practical implications are also discussed.