• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.10a
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• pp.175-177
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• 2014

자녀 교육에 대한 관심의 증대로 다양한 미디어를 활용하여 많은 유아 교육용 프로그램이 상용화되어 있다. 그 중 스마트폰의 활용 분야가 넓어지면서 자연스럽게 유아 교육 분야도 스마트폰에 접목이 되고 있는 추세이다. 본 논문에서는 동화책을 읽어주는 행위와 90년대 초중반에 유행했던 게임북을 스마트폰에 접목시켜 자녀와 부모가 함께 할 수 있는 유아 교육용 어플리케이션 설계를 제안한다. 본 논문의 어플리케이션은 동화를 보는 중 스토리 중간 중간 간단한 미니게임 및 문제 선택 결과에 따라 본래의 동화 스토리 또는 허구 스토리 동화로 진행되어 다양한 엔딩을 볼 수 있다. 또한 동요듣기, 악기다루기, 율동 배우기, 스트레칭 등 여러 옵션을 제공한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2010.04a
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• pp.1102-1105
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• 2010

본 논문에서는 세종 말뭉치 데이터를 활용할 때 한글코드의 변환 및 말뭉치에서 필요한 정보 추출 등 한국어 말뭉치에서 통계 정보를 추출하는데 사용되는 여러 가지 기능들을 한데 묶어, 말뭉치 작업의 사용자 편의성을 개선시키기 위한 도구를 설계, 구현하였다. 이 말뭉치 활용 도구는 세종 말뭉치의 원시, 형태, 형태의미, 구문 말뭉치들을 다양한 옵션에 따라 사용자가 원하는 데이터를 추출할 있을 뿐만 아니라 일반적인 한글 텍스트 파일에 공통적으로 사용되는 코드 변환, 파일 합병, 빈도 계산 등을 제공하기 때문에 말뭉치 작업을 하는 사용자들이 편리하게 사용할 수 있게 하였다.

• Journal of Digital Convergence
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• v.8 no.3
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• pp.129-141
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• 2010

Though an internet survey, an alternative method for the off-line survey, has various merits is, it still has some problems such as sampling bias and low reliability from insincerity during survey. Especially the exogenous variables such as sample respondents of the environment should be controlled to make internet survey trustworthy. This study attempts to design and implement such system that can help researchers to control the network and sampling environment and behaviors on respondents. Thru the various Question forms and structured Questionnaire design, this study tries to contribute the improvement of survey satisfaction and the reliability for survey result in internet survey system.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.49 no.2
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• pp.155-166
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• 2021

In this paper, design study of a small two-stage launch vehicle is undertaken for the dedicated launch of the Compact Advanced Satellite 500 (CAS500)-class satellite into the Low Earth Orbit (LEO) by modifying the second and third stages of the Korean Space Launch Vehicle II (KSLV-II). Since the KSLV-II has three stages, velocity increment is newly distributed for the two-stage small launch vehicle. For this end, the staging design is carried out for the design parameters such as stage mass ratios, structural coefficients and engine options for each stage followed by trajectory analysis. Investigation of the results provides the combination of design parameters for the small launch vehicle for the dedicated launch of 500 kg-class satellite into LEO.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.43 no.9 s.351
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• pp.23-30
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• 2006

This paper presents a design of a high-efficiency CMOS DC-DC boost converter using a current-sensing feedback method. High-precision current-sensing circuity is incorporated in order to sense the current flowing in the inductor, which determines the switching scheme of the pulse-width modulation. The external components or large chip area for the frequency compensation can be avoided while maintaining the stable operations of the converter. Various input/output voltage levels can be available through the external resistor strings. The designed DC-DC converter is fabricated in a 0.18-um CMOS technology with a thick-gate oxide option. The converter shows the maximum efficiency over 90% for the output voltage of 3.3V and load current larger than 200mA. The load regulation is 1.15% for the load current change of 100mA.

• Journal of Advanced Navigation Technology
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• v.9 no.1
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• pp.61-69
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• 2005

TCP and UDP is a transport layer protocol of Internet. TCP is a connection oriented protocol which supports a reliable data transfer by offering error and flow control, but it bring a transmission delay. On the other hand, the UDP is a connectionless protocol which does not carry out error and flow control, but it guarantees a realtime transmission. There are hardly any protocols which supports not only realtime functions but also data reliability. In this paper, we have designed and implemented a new TCP mode option which supports reliable realtime transmission. Our designed TCP performs an error recovery process during a fixed amount of time. This time is negotiated during the connection establishment phase. Our designed TCP is tested in real environments, and we find that it is relatively faster than the standard TCP and more reliable than the UDP. It can be used for the reliable transfer of realtime multimedia data.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• autumn
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• pp.230-233
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• 2003

As the consumer's consumption standard has raised, occupants' needs for the apartment is diversified and complicated. But the existing mass housing supply method has many problems and it couldn't satisfy the dwellers' various needs and overall expected life span. In order to correspond those needs, construction firms have introduced several method, such as plus option, minus option, on-time option, change up service and so on. The custom-built apartment is more supplementary and it can reflect the consumer's needs to the apartment directly. But after running the custom-built apartment, several problems is revealed. So. in this study, I defined the general idea of the custom-built apartment and then collect the case of the custom-built apartment.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.13 no.2
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• pp.165-170
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• 2013

This paper proposes a method of simplification for robot simulation creation using functional concise script. General robotics simulation authoring tools require professional knowledge regarding development language and their APIs, and these prerequisites are considered as a big obstacle in implementing robotics simulation. In order to resolve these problems, we developed an authoring tool using functional concise script in building simulation environment, and this concise script composes of simplified service commands and minimum options. In experiment, we educated students and teachers in High school to use this authoring tool and we verified that the proposed method makes it possible to build robotics simulation environment and control simulated robots through one-day training course for the novices.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.11a
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• pp.702-705
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• 2017

최근 들어 개인정보 보호의 중요성에 대한 인식이 높아지고 있다. 개인정보 위협 요소 증가 및 유출 사고 증가 등으로 개인정보 보호 필요성이 높아지고 있으며, 개인정보보호법 발효 및 시행에 따른 기술적 보호 마련을 위하여 외국계 카드 발행사에서 지속적으로 PCI DSS(Payment Card Industry Data Security Standard)의 준수를 요청하고 있다. 카드 소유자의 데이터를 전송, 처리, 저장하는 환경에 대한 인증으로 적격업체 선정의 자격을 주기도 한다. 이러한 보안성 심의 기준이 강화되고 있으나 DB 암호화 제품인 TDE(Transparent Data Encryption) 방식의 암호화 방법은 암호화 기능 이외에 접근제어, 키 기밀성 보장을 위한 옵션의 추가 도입 검토가 필요하며, 서비스를 위해서 DB 전용 메모리 영역(SGA)의 Buffer Cache에 평문(Plain Text)으로 복호화한 후 로드하여 사용하므로 예상치 못한 또 다른 심각한 데이터 유출의 위험이 있다. 본 논문에서는 개인정보 암호화 방법을 연구하고 구현과정에서 발생한 문제에 대한 해결 과정을 설명하였다.

• The KIPS Transactions:PartA
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• v.12A no.6 s.96
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• pp.471-476
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• 2005

Exception mechanism in Java allows programmers to define, throw and catch exceptional conditions. It is important for the development of reliable programs to make sure that exceptions are handled appropriately at run-time. In this paper, we develop an exception monitoring system, which can help programmers trace and handle exceptions effectively. Using this system, programmers can examine exception handling process in detail by tracing only interesting exceptions, and can handle exceptions more effectively. To reduce performance overhead, we design the system based on code instrumentation. Moreover, we show the effectiveness of the system by experiments on benchmark programs.