• Journal of Advanced Marine Engineering and Technology
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• 제39권9호
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• pp.959-966
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• 2015

본 논문에서는 Walsh code를 이용하여 중첩된 Light emitting diode(LED) 송신신호들을 수신부에서 각각의 LED 송신신호로 식별하고 조명의 깜박임 현상을 제거할 수 있는 Manchester code 기반 가시광 통신 실내 위치인식 시스템을 제안한다. 제안한 시스템은 고정된 LED 광원의 위치정보들과 수신부에서 그들로부터 수신된 신호들을 람버시안 방사 특성과 삼변 측량법을 이용하여 수신부의 상대적인 위치를 추정할 수 있다. 제안한 논문의 타당성을 검증하기 위하여 16개의 LED 조명을 설치한 $6{\times}6{\times}1.5m^3$의 실내 공간에서 모의실험을 수행하였다. 그 결과, 중첩된 송신신호들은 수신부에서 분리가 가능하고 측위 오차는 최대 0.2977 m, 평균 오차 0.0536 m로 정밀한 위치 인식이 가능하였다.

• 한국정보과학회논문지:소프트웨어및응용
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• 제28권12호
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• pp.955-965
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• 2001

본 논문에서는 함수형 언어 Haskell 을 Java언어로 변환하여 Java Virtual Machine 에 수행하는 컴파일 방법을 제안한다. 이 컴파일 방법은 추상 기계 Spineless Tageless G-machine(STGM)을 수행 모델로 삼는다 L-code로 명명한 중간 언어를 도입하여 추상기계의 각각의 세부 동작을 이 언어의 명령어로 표현하고, 일견의 세부 동작들을 이 언어의 바인딩을 통해 표현한다. 각 명령어는 Java의 문장으로 변환하기 쉽도록 정의하였다. Java에서의 표현 방법을 결정하고. STS 프로그램의 L-code 프로그램으로의 컴파일 규칙과 Java 프로그램으로의 컴파일 규칙을 세안한다. 실험을 통해 제안한 컴파일러에 의해 Haskell 프로그램으로부터 생성된 Java 프로그램의 수행 성능은 Glasgow Haskell 컴파일러의 최적화 변환을 적용했을 때 기존의 Haskell 인터프리터인 Hugs와 대등함을 보인다

• 제어로봇시스템학회논문지
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• 제19권7호
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• pp.614-619
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• 2013

In multi-robot systems, ultrasonic sensors are widely used for localization and/or obstacle detection. However, conventional ultrasonic sensors have a drawback, that is, the interference problem among ultrasonic transmitters. There are some previous studies to avoid interferences, such as TDMA (Time Division Multiple Access) and CDMA (Code Division Multiple Access). In multiple autonomous mobile robots systems, the Doppler-effect has to be considered because ultrasonic transceivers are attached to the moving robots. To overcome this problem, we find out the ASK (Amplitude Shift Keying)-CDMA technique is more robust to the Doppler-effect than the BPSK (Binary Phase Shift Keying)-CDMA technique. In this paper, we propose a new code-expression method and a Monte-Carlo based algorithm that optimizes the ultrasonic code combination in the ASK-CDMA ultrasonic system. The experimental results show that the proposed algorithm improves the performance of the ultrasonic multiple accessing capacity in the ASK-CDMA ultrasonic system.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2005년도 춘계 학술발표회 논문집
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• pp.464-470
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• 2005

The numerical analysis is carried out to identify the influence of design factors to shear capacity of cast-in-place (CIP) anchor in ACI 349 Code that is available for the design of fastening system at Nuclear Power Plant (NPP) in this study. The MASA program is used to develop the numerical analysis model and the developed numerical analysis model is verified on a basis of the various test data of CIP anchor. Both $l/d_o$ and $c_1/l$ we considered as design factors. As a result, the variation of $l/d_o$ has no influence on the shear capacity of CIP anchor but $c_1/l$ has a large influence on the shear capacity of CIP anchor, Therefore, it is proved that ACI 349 Code may give a non-conservative results compared with real shear capacity of CIP anchor according to $c_1/l$.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1999년도 춘계학술대회논문집
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• pp.22-25
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• 1999

A dynamic explicit finite element code for simulating sheet forming processes has been developed The code utilises the discrete Kirchhoff shell element and contact force is treated by a conventional penalty method. In order to reduce the computational cost a new and robust contact searching algorithm has been developed and implemented into the code. in the method a hierarchical structure of tool segments called a tree structure is built for each tool at the initial stage of the analysis Tree is built in a way to divide a trunk to 8 sub-trunk 2 in each direction until the lowest level of the tree(leaf) contains exactly one segment of the tool. In order to have a well-balanced tree each box on each sub level contains one eighth of the segments. Then at each time step contact line from a node comes out of the surface of the tool. Simulation of various sheet forming processes were performed to verify the validity of the developed code with main focus on he usefulness of the developed contact searching algorithm.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2001년도 추계학술대회 논문집
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• pp.68-72
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• 2001

Two different methods of free span analysis of offshore pipelines by DnV codes were introduced and compared in order to calculate the allowable free span lengths of the offshore pipelines. The allowable span lengths of the offshore pipelines for installation, hydrotest and operation conditions by static and dynamic span analysis were determined. Static analysis was performed by ASME codes and dynamic span analysis was performed by both 1981 DnV code. Comparison of two codes were carried out. A new design procedure to calculate the allowable span lengths was developed with new DnV code.

• 한국항해학회지
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• 제21권1호
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• pp.89-102
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• 1997

Since 1979, the People's Republic of China has been opeining their marke tprogressively toward all over the world for developing its own domestic economy and international trade. China also has paid a great attention to the international maritime transport due to the fact that its volume of international trade has increased continuoulsy. Under such circumstance, the Chinese Maritime Code was issued in 1992 in which the regulation with regard to carrier's liability occupied an important position. The author, therefore, selected this issue for demonstration of the legal proinciples about carrier's liability which is provided in the Chinese Maritime Code. The study on the issue is under guidance of related international conventions. On the basis of the above, the differences between the Code and relevant conventions have been pointed out in order to make the people in the field of shipping understood for legal system with regard to carrier's liability in China which is a great potential partner of Korea in shipping and trade.

• Journal of Advanced Marine Engineering and Technology
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• 제25권2호
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• pp.375-382
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• 2001

In this study, an adapted Turbo Coding Algorithm for reducing communication error of a fire detection system for marine vessels, especially image transmission via power lone. Because it is necessary that this system communicate larger and faster than previous method, this study carried out enhancement a decoding speed by adaptation CRC with Turbo Code Algorithm, improvement of metric method, and reduction of decoding delay by using of Center-to-Top method. And the results are as follows: (1) Confirmed that a Turbo Code is so useful methods for reducing communication error in lots of noise environments. (2)Proposed technology in this study speed increasing method of Turbo Coding Algorithm proves 2 times faster than normal Turbo Code and communication error reducing as well in the board made by VHDL software & chips ALTERA company.

• 패션비즈니스
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• 제26권6호
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• pp.1-13
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• 2022

The purpose of this study was to find out the type of fashion codes hip-hop fashion has in contemporary Chinese fashion, and the frequency and characteristics of each fashion code. Text mining, which is the most basic analysis method in big data analyticswas used rather than traditional design element analysis. Specific results were as follows. First, hip-hop initially entered China in the late 1970s. The most historical turning point was the American film "Breakin". Second, frequency and word cloud analysis results showed that the "national tide" fashion code was the most notable code. Third, through word embedding analysis, fashion codes were divided into types of "original hip-hop codes", "trendy hip-hop codes", and "hip-hop codes grafted with traditional Chinese culture".

• 한국의류학회지
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• 제24권4호
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• pp.451-462
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• 2000

This study is to investigate the current use of POS system in Korean clothing industry, so that we can make suggestions for better use of it. We interviewd companies using POS systems as well as EAN Korea which is in charge of POS data processing. As a results. we found out that standard KAN code has severe difficulties to cope with the diversity of the information which is necessary in clothing industry. Therefore we are making some suggestions to use KAN code as a recognizing code for more structured master data file for extremely diverse clothing items.