• KSCI Review
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• v.2 no.1
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• pp.121-129
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• 1995

Fault simulation of logic circuits is an important part of the test-generation process. It is used for the propose of generation fault dictionaries or for the verification of the adequacy of tests. In this paper, a backtrace fault simulation is proposed to test generation. This is consists of 3 part ; initialization phase for given circuit, backtrace fault simulation phase to find fault list and reevaluation phase to list event. The main idea of this algorithm is to retain a minimum fault list by cutting uncontrollable lines of path when a logic event occurs in backward tracing phases. And the simulator is revaluates a fault list associated with the output of an element only if logic event occurs at any of its inputs when a list event occurs at one of its primary inputs. It reguires a O(n) memory space complexity. where n is a number of signal lines for the given circuits. Several examples are given to illustrate the power of this algorithm.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.19 no.5
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• pp.533-540
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• 2008

In the sum and difference pattern synthesis problem of the equi-spaced monopulse tracking linear array antennas, an efficient numerical approach to deriving the relative excitation current weights of antenna elements is presented for the desired patterns. This method is based on the optimum perturbation of null points which are inherent to the Schelkunoffs polynomial representing the pattern array factor. Accordingly, opposite to the conventional method in which the excitation weights are directly optimized, this method is advantageous in that the patterns with the desired individual sidelobe levels(SLLs) and the corresponding excitation weights are easily synthesized by the control of null points. Furthermore, it is showed that two types of difference patterns can be synthesized as imposing the different initial values of null points in the optimization process. The proposed method is numerically validated by synthesizing the patterns with the arbitrary SLLs and substituting the extracted results into the array factor equation.

• Journal of Platform Technology
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• v.9 no.4
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• pp.60-70
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• 2021

This paper proposes a method capable of stably tracking the coordinates of a patterned laser image in a curved screen shooting system using two or more channels of multiple cameras. This method can track and acquire target points very effectively when applied to a multi-screen shooting method that can replace the HMD shooting method. Images of curved screens with severe deformation obtained from individual cameras are corrected through image normalization, image binarization, and noise removal. This corrected image is created and applied as an Euclidean space map that is easy to track the firing point based on the matching point. As a result of the experiment, the image coordinates of the pattern laser were stably extracted in the curved screen shooting system, and the error of the target point position of the real-world coordinate position and the broadband Euclidean map was minimized. The reliability of the proposed method was confirmed through the experiment.

• Journal of the Korean Institute of Telematics and Electronics S
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• v.36S no.3
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• pp.89-96
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• 1999

본 논문에서는 빠른 수행 속도를 가지고 여러 대의 차량을 동시에 추적할 수 있는 다중 차량 추적 알고리즘을 제안한다. 이러한 작업은 연속 영상으로부터 움직이는 물체의 동작 정보를 구하는 동작 분할(motion segmentation)단계와 칼만 필터(Kalman filter)를 이용해서 물체의 위치를 예측하는 동작 예측(motion estimation)단계로 나누어진다. 제안된 알고리즘은 아핀 동작 모델(Affine motion model)을 적용하여 동작 정보를 근사화함으로써 두 개의 선형 칼만 필터를 사용하고, 칼만 필터에서 예측된 위치 정보를 동작 분할 과정에 사용하여 빠른 추적이 이루어지도록 하였다. 또한, 다중 물체 추적 시 중요한 데이터 연결 문제(data association problem)를 해결하기 위해서 패턴 인식 방법을 도입하였다. 제안된 알고리즘을 고속 도로 영상에 대해 적용했을 때, 빠르고 정확한 다중 차량 추적이 이루어짐을 실험 결과를 통해 보였다.

• The KIPS Transactions:PartB
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• v.8B no.1
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• pp.50-58
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• 2001

본 논문에서는 움직임을 갖는 다중 물체 중에서 하나의 물체를 선택하고, 선택된 물체를 계속 추적하는 알고리즘을 제안하였다. 일반적으로 차영상을 이용하는 이동물체의 동작정보 추출방법은 주로 연속되는 영상내에서 일정한 영역의 영상특성을 정합하는 방법이 주로 사용되어왔다. 본 논문에서 제안한 동작정보의 추출방법은 연속영상간의 차연산을 한번 시행함으로써 얻어진 움직임영역을 기반으로 사용자에 의해 임의로 선택된 특정한 움직임영역을 추출하는 것이다. 특정한 모양이나 패턴을 인식하여 추적하는 것과는 달리 본 논문에서는 사용자에 의해 선택된 물체를 추적목표물체로 삼는 새로운 이동추적 방법을 제시하였다. 실험은 CCD 카메라로 입력된 실제 금붕어 영상을 이용하여 선택된 이동물체의 추적이 효과적으로 수행됨을 보였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2010.10a
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• pp.59-61
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• 2010

컨테이너터미널에서 사용되는 하역장비의 에너지 소비패턴을 분석하여 효율적인 에너지 소비 관리방안을 제시하고자 한다. 컨테이너터미널의 하역장비는 전기에너지와 유류에너지 소비 패턴의 차이가 있으며, 이를 실적자료를 바탕으로 분석하였다. 또한 하역장비의 상호작용에 의한 대기현상을 발생과정을 분석하여 에너지 소비가 많은 애로공정을 도출하였으며, 하역장비 애로공정의 발생지점을 분석하였다. 에너지 소비 관리방안으로 처리량과 에너지 소비 상관계수 비교, 처리물량 변화 패턴 추적 관리, 하역장비 부족에 의한 에너지 소비 애로공정 관리 등의 3가지를 제시하였다.

• Congress of the korean instutite of fire investigation
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• 2010.06a
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• pp.82-89
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• 2010

화재조사에 있어서 화재현장에서 발견되는 피해자들의 소사체는 사망원인을 밝히는 법의학적 측면에서 매우 중요하지만 현장에서 연료로 작용하여 발화부를 추적하는 화재패턴에 영향을 미칠 수 있으므로 연소적인 측면에서 소사체를 가연물로서 고려해볼 필요가 있다. 화재는 가연물의 열량과 분포에 따라서 그 화재패턴 또한 다르게 생성된다. 인체의 구성요소는 대부분 가연물이며 특히 동물성지방은 과거 등불의 연료로 사용되었을 만큼 가연성과 열량이 높다. 본 논문에서는 인체의 지방을 대신하여 돼지의 동물성지방의 연소적 특성을 고찰하였으며, 그 특성은 고체연료인 파라핀과 대동소이하여 화재현장의 분위기에 따라서 때로는 바닥에 액체가연물에 의한 패턴을 생성시킬 수 있고 가연물지배에 의한 연소로 사체 중심의 화재패턴을 생성할 수 있어 화재패턴을 통한 발화부의 판단에 혼란을 초래할 가능성이 매우 높으며 이러한 가능성은 실제 사례에서도 확인할 수 있었다. 화재사체의 연소적인 특성을 이해하는 것은 사체가 연관된 화재현장에서 화재패턴을 해석하는데 있어서 많은 도움이 될 것이며 경우에 따라서는 필수적인 요소가 될 것으로 사료된다.

• Journal of Advanced Navigation Technology
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• v.24 no.5
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• pp.393-407
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• 2020

In order to reduce the threat by illegal unmanned aerial vehicles, a tracking system based on sound was implemented. There are three main points to the drone acoustic tracking method. First, it scans the space through variable beam formation to find a sound source and records the sound using a microphone array. Second, it classifies it into a hidden Markov model (HMM) to find out whether the sound source exists or not, and finally, the sound source is In the case of a drone, a sound source recorded and stored as a tracking reference signal based on an adaptive beam pattern is used. The simulation was performed in both the ideal condition without background noise and interference sound and the non-ideal condition with background noise and interference sound, and evaluated the tracking performance of illegal drones. The drone tracking system designed the criteria for determining the presence or absence of a drone according to the improvement of the search distance performance according to the microphone array performance and the degree of sound pattern matching, and reflected in the design of the speech reading circuit.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39C no.4
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• pp.380-386
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• 2014

In this paper, a higher-order mode coupler using coaxial-structure waveguide for Ku-band monopulse satellite tracking is proposed. The proposed higher-order mode coupler is built in a coaxial structure for compactness and weight reduction, making it suitable for mobile tracking systems. The inner circular waveguide of coaxial-structure is used to extract the fundamental mode signal and the high-order mode signal is extracted from the four slots of the outer circular waveguide and then transmitted via given stepped rectangular waveguide structure. The simulated results show that proposed higher-order mode coupler covers 250 MHz(12.75 GHz ~ 13.00 GHz) bandwidth with return loss and insertion loss characteristics. The antenna patterns of fundamental mode and higher-order mode applicable to monopulse tracking are generated successfully. Designed higher-order mode coupler using coaxial waveguide structure for Ku-band is expected to be used for high precision monopulse satellite tracking systems.

• Journal of KIISE:Software and Applications
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• v.29 no.8
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• pp.555-564
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• 2002

Design patterns are used to utilize well-defined design information. As using these design patterns, we can get re-use in object-oriented paradigm, decrease the time of development and improvement the quality of software. Although these design patterns are widely used among practice, most of design patterns information is manually used, inconsistent and its utilization could be very low. Because the design patterns information that a designer applies does not appear in software, it is sometimes difficult to track them. In this paper, we propose a tool support for design pattern-oriented software development. This tool supports design pattern management, software design and automatic source code generation. The design pattern management has the function for storing, managing and analyzing the existing design pattern and registering new design pattern. The software design has the function for software design with UML and automatically generate design pattern elements. By using this design information, this system can automatically generate source code. In the result to include the tracking design pattern element that is not Included In the existing CASE tools into design information, we can build the stable and efficient system that provides to analyse software, manage design pattern and automatically generate source code.