• Korean Journal of Geomatics
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• v.4 no.2
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• pp.47-52
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• 2004

We can process and compute the position, velocity and time by satellite signals of GPS. The signals are used to compute positioning of three dimensions and timing offset of the receiver clock when we can track the tour satellite signals at least. One of the specified aims is to use less expensive single frequency code/carrier phase GPS receivers, which are typically around half the price of dual frequency receivers. In the study, the author analyzed the accuracy and applicability of frequence linear combination using triangulation points evaluated distance limitation.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.05a
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• pp.444-446
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• 2010

It has been so many XML applications by development of Web. Also, it keeps going to sore and manage them in object-oriented methods. It is widely used methods using UMLamong them. There are several software to support UML which has diagrams and generates object oriented code easily.It is proposed framework to map from various XML applications to UML/OCL for supporting efficient object based management of Web documents.

• Structural Engineering and Mechanics
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• v.10 no.2
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• pp.165-180
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• 2000

An analytical model with tension softening for the prediction of the capacity of prestressed concrete beams under pure torsion and under torsion combined with shear and flexure is introduced. The proposed approach employs bilinear stress-strain relationship with post cracking tension softening branch for the concrete in tension and special failure criteria for biaxial stress states. Further, for the solution of the governing equations a special numerical scheme is adopted which can be applied to elements with practically any cross-section since it utilizes a numerical mapping. The proposed method is mainly applied to plain prestressed concrete elements, but is also applicable to prestressed concrete beams with light transverse reinforcement. The aim of the present work is twofold; first, the validation of the approach by comparison between experimental results and analytical predictions and second, a parametrical study of the influence of concentric and eccentric prestressing on the torsional capacity of concrete elements and the interaction between torsion and shear for various levels of prestressing. The results of this investigation presented in the form of interaction curves, are compared to experimental results and code provisions.

• Journal of Information Processing Systems
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• v.14 no.6
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• pp.1331-1346
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• 2018

Aiming at the problem that the gradient-based edge detection operators are sensitive to the noise, causing the pseudo edges, a triqubit-state measurement-based edge detection algorithm is presented in this paper. Combing the image local and global structure information, the triqubit superposition states are used to represent the pixel features, so as to locate the image edge. Our algorithm consists of three steps. Firstly, the improved partial differential method is used to smooth the defect image. Secondly, the triqubit-state is characterized by three elements of the pixel saliency, edge statistical characteristics and gray scale contrast to achieve the defect image from the gray space to the quantum space mapping. Thirdly, the edge image is outputted according to the quantum measurement, local gradient maximization and neighborhood chain code searching. Compared with other methods, the simulation experiments indicate that our algorithm has less pseudo edges and higher edge detection accuracy.

• Computers and Concrete
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• v.23 no.4
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• pp.255-265
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• 2019

The potential of using genetic programming to predict engineering data has caught the attention of researchers in recent years. The present paper utilized weighted genetic programming (WGP), a derivative model of genetic programming (GP), to model the compressive strength of concrete. The calculation results of Abrams' laws, which are used as the design codes for calculating the compressive strength of concrete, were treated as the inputs for the genetic programming model. Therefore, knowledge of the Abrams' laws, which is not a factor of influence on common data-based learning approaches, was considered to be a potential factor affecting genetic programming models. Significant outcomes of this work include: 1) the employed design codes positively affected the prediction accuracy of modeling the compressive strength of concrete; 2) a new equation was suggested to replace the design code for predicting concrete strength; and 3) common data-based learning approaches were evolved into knowledge-based learning approaches using historical data and design codes.

• Annual Conference of KIPS
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• 2013.11a
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• pp.81-82
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• 2013

바이트 단위로 접근이 가능하고, 비휘발성을 가지는 SCM(Storage Class Memory)을 이용하여 프로세스의 작업공간으로 활용함과 동시에 파일을 저장하는 형태의 운영체제 기법에 대한 연구가 활발하게 이루어지고 있다. 본 논문에서는 이러한 형태에서 파일이 저장되는 방법을 토대로 프로세스 생성 시 실행 파일의 읽기 전용의 특성을 가지는 실행 코드를 프로세스 공간에 직접 매핑하는 기법에 대하여 제안한다.

• Journal of Powder Materials
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• v.30 no.1
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• pp.29-34
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• 2023

A fixed-point iteration is proposed to integrate the stress and state variables in the incremental analysis of plastic deformation. The Conventional Newton-Raphson method requires a second-order derivative of the yield function to generate a complicated code, and the convergence cannot be guaranteed beforehand. The proposed fixed-point iteration does not require a second-order derivative of the yield function, and convergence is ensured for a given strain increment. The fixed-point iteration is easier to implement, and the computational time is shortened compared with the Newton-Raphson method. The plane-stress condition is considered for the biaxial loading conditions to confirm the convergence of the fixed-point iteration. 3-dimensional tensile specimen is considered to compare the computational times in the ABAQUS/explicit finite element analysis.

• Annual Conference of KIPS
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• 2010.11a
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• pp.1632-1634
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• 2010

고성능 재구성형 어레이 아키텍처는 애플리케이션에 내재된 병렬성을 충분히 활용하도록 풍부한 하드웨어 리소스로 구성되어 있다. 이러한 하드웨어 리소스는 소프트웨어 파이프라이닝 기반 코드할당 기법을 통하여 사용된다. 이러한 코드할당 기법은 기존의 소프트웨어 파이프라이닝 기법에 FPGA 에서의 라우팅 & 위치선정기법이 연결된 형식으로 구성된다. 이러한 기존의 연구들은 데이터 흐름 (data flow)을 단순한 형태로 가정하여 개발되었다. 따라서 루프 코드 펼침 (loop unrolling)에 따라서 발생되는 데이터 복사에 의한 흐름 (copy flow)은 코드 매핑할 때 고려하지 않기 때문에 소프트웨어 파이프라이닝 적용시 네트웍 리소스의 중복사용으로 인한 데이터 충돌문제(data congestion)로 Minimum Initiation Interval (MII)증가에 따르는 성능 저하가 발생할 수 있다. 본 연구에서는 다양한 데이터 복사 흐름까지 고려하도록 데이터 의존도 그래프 (Data Dependence Graph, DDG)를 확장하여 스케쥴링 단계에서 데이터 충돌 지연에 의한 MII 증가를 방지하여 최적의 시스템 성능을 얻도록 코드 할당 기법을 개발하였다.

• Annual Conference of KIPS
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• 2008.05a
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• pp.640-643
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• 2008

현재 우리나라는 좁은 국토와 도시 집중화로 인해 급증하고 있는 지하매설물의 체계적인 관리가 어느 때보다 요구되고 있다. 그러나 다른 분야에서 빠르게 진행되고 있는 전산화 및 정보화 작업에 비해 상대적으로 더딘 지리정보체계 구축으로 지하매설물 관리를 위한 정보시스템이 미비한 상태이다. 이는 지리정보체계 구축 방법에 어려움과 소요되는 인력, 비용, 시간 등이 크기 때문으로 판단된다. 본 논문에서는 GPS와 능동형 RFID를 이용한 위치기반 지하매설물 정보시스템의 구현을 기술하고 시뮬레이션하였다. 이 시스템은 GPS NMEA Sentence의 위치정보와 능동형 RFID의 인식정보를 결합한 데이터를 이용하여 정확하고 체계적인 지하매설물 정보 구축이 가능하고, 효율적인 지하매설물 관리를 위한 인터페이스를 제공한다.

• Nuclear Engineering and Technology
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• v.56 no.10
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• pp.4062-4067
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• 2024

In this article, we propose and explore a novel step in the digitization of the mapping of the spent fuel pool of nuclear power plants, in which the audio signal from the operator's microphone is used to obtain the identification codes of those components that are in each of the cells of the pool. In this way, we have not only an acquisition system but also a verification system that can be used in combination with the outcome of the analysis of the video signal. We developed an algorithm that uses at its core one of the latest models of multilingual Automatic Speech Recognition to transcribe audio signal, and with a post-processing of the timed transcriptions we build the identification code of fuel heads and other components. Results show a very high accuracy in audios from real recording of Spanish nuclear facilities, and the methodology proposed is easily extensible to other nuclear facilities in the world.