• 한국컴퓨터정보학회논문지
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• 제21권9호
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• pp.37-43
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• 2016

This paper introduces a method for video shot group detection needed for efficient management and summary of video. The proposed method detects shots based on low-level visual properties and performs temporal and spatial clustering based on visual similarity of neighboring shots. Shot groups created from temporal clustering are further clustered into small groups with respect to visual similarity. A set of representative shot frames are selected from each cluster of the smaller groups representing a scene. Shots excluded from temporal clustering are also clustered into groups from which representative shot frames are selected. A number of video clips are collected and applied to the method for accuracy of shot group detection. We achieved 91% of accuracy of the method for shot group detection. The number of representative shot frames is reduced to 1/3 of the total shot frames. The experiment also shows the inverse relationship between accuracy and compression rate.

• 한국신뢰성학회지:신뢰성응용연구
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• 제16권1호
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• pp.32-40
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• 2016

Purpose: The purpose of this study is to analyze the effect of sampling points on accuracy of storage reliability estimation for one-shot systems by assuming a weibull distribution as a storage reliability distribution. Also propose method for determining of sampling points for increase the accuracy of reliability estimation. Methods: Weibull distribution was divided into three sections for confirming the possible to estimate the parameters of the weibull distribution only some section's sample. Generate quantal response data for failure data. And performed parameter estimation with quantal response data. Results: If reduce sample point interval of 1 section, increase the accuracy of reliability estimation although sampling only section 1. Even reduce total number of sampling point, reducing sampling time interval of the 1 zone improve the accuracy of reliability estimation. Conclusion: Method to increase the accuracy of reliability estimation is increasing number of sampling and the sampling points. But apply this method to One-shot system is difficult because test cost of one-shot system is expensive. So propose method of accuracy of storage reliability estimation of one-shot system by adjustment of the sampling point. And by dividing the section it could reduce the total sampling point.

• 한국군사과학기술학회지
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• 제15권4호
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• pp.435-441
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• 2012

This paper provides simulation-based results of effect analysis of sample size and sampling periods on accuracy of reliability estimation methods using multiple comparisons with analysis of variance. Sum of squared errors in estimated reliability measures were evaluated through applying seven estimation methods for one-shot systems to simulated quantal-response data. Analysis of variance was implemented to investigate change in these errors according to variations of sample size and sampling periods for each estimation method, and then the effect analysis on accuracy in reliability estimation was performed using multiple comparisons based on sample size and sampling periods. An efficient way to allocate both sample size and sampling periods for reliability estimation tests of one-shot systems is proposed in this paper from the effect analysis results.

• 대한산업공학회지
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• 제36권4호
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• pp.212-218
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• 2010

This paper shows accuracy comparison results of reliability estimation methods for one-shot systems with respect to sample sizes. To compare accuracy in reliability estimation methods, quantal-response data, characterizing one-shot systems, were simulated using failure times of LED obtained through the accelerated life test, and then the true reliability over time was evaluated using the failure times. The simulated quantal-response data were used to estimate the true reliability through applying reliability estimation methods in open literature. Accuracy of each reliability estimation method was compared in terms of both SSE (Sum of Squared Error) and MSE (Mean Squared Error), and then estimation trend for each method is found. Feasible bounds which true reliability would exist within were estimated through applying the found trends to quantal-response data set of a real weapon system.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2021년도 춘계학술발표대회
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• pp.358-361
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• 2021

In order to improve the accuracy of small target detection more effectively, this paper proposes an improved single shot detector (SSD) target detection and recognition method based on cspdarknet53, which introduces lightweight ECA attention mechanism and Feature Pyramid Network (FPN). First, the original SSD backbone network is replaced with cspdarknet53 to enhance the learning ability of the network. Then, a lightweight ECA attention mechanism is added to the basic convolution block to optimize the network. Finally, FPN is used to gradually fuse the multi-scale feature maps used for detection in the SSD from the deep to the shallow layers of the network to improve the positioning accuracy and classification accuracy of the network. Experiments show that the proposed target detection algorithm has better detection accuracy, and it improves the detection accuracy especially for small targets.

• 재활복지공학회논문지
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• 제11권4호
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• pp.377-383
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• 2017

본 연구에서는 휠체어 컬링 샷정확도 향상을 위한 압박형 훈련장비를 제안하였다. 제안된 장비는 가이드폭 조절을 퉁해 샷의 좌 우정확도 향상을 위한 심리적 압박을 제공하고, 레이저디스턴스 모듈 세트를 통해 샷의 강도 정확도 향상을 제공함으로써 종합적인 샷의 정확도 향상을 꾀할 수 있으며, 샷 진행영상 피드백을 통해 현장에서의 즉각적인 경기력 분석을 지원할 수 있도록 개발되었다. 휠체어 컬링 대표팀 코칭스태프, 협회관계자, 아이스메이커 등과의 파일럿 시험을 수행하고 의견을 청취한 결과, 종합적인 샷 정확도 훈련, 심리적 압박, 경기력 분석에서의 개발장비의 유용성을 확인할 수 있었다.

• 방송공학회논문지
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• 제25권4호
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• pp.576-586
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• 2020

레이더나 라이더 센서를 활용한 야구 경기 분석은 많은 비용이 요구된다. 본 논문에서는 중계 비디오에서 피치 샷과 타구 샷을 검출하고, 카메라의 움직임 기반 타구 궤적 생성 알고리즘을 제안한다. 제안하는 알고리즘은 객체 검출과 옵티컬 플로우 기반 피치 샷과 타구 샷 검출 이후, 프레임 간 변환 관계를 통해 프레임 내 타구 위치와 타구 궤적을 계산한다. 제안 방법은 KBO 중계 영상 시퀀스 3개에 대해 성능을 평가하였고 피치 샷과 타구 샷 검출 정확도와 검출률은 89-95[%] 이내의 성능을 보였으며, 평균 타구 위치 거리차이는 13.6[m], 방향 차이 7.5°, 파울 분류 정확도 98.6%의 성능을 보였다.

• 한국항공우주학회지
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• 제35권5호
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• pp.419-425
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• 2007

수직발사를 위한 스트랩다운 관성항법시스템의 급속 One-Shot정렬 기법을 제시한다. 제시된 정렬기법은 종 항법시스템(Slave INS)의 가속도계 출력 값 및 주 항법시스템(Master INS)의 자세를 이용한다. 또한 정렬 성능 및 속도를 개선시키기 위하여 등가선형변환 및 사전 필터링 기법을 제시한다. 시험결과들은 제시된 방법이 정렬 정확도 및 정렬 속도 개선에 효과적임을 보였다.

• 한국군사과학기술학회지
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• 제14권2호
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• pp.167-172
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• 2011

In this paper, a study on variation of an accuracy rate as the gradient of a rifle is shown. In the a state of hostilities, a soldier is not easy to take a shot vertically against the ground. If a soldier shoots as the pistol is inclined, how the accuracy rate is changed. While the pistol is shot, the change of ballistic curve is estimated. And we also verify the accuracy rate through the firing test. Then we compare two results and present some ideas which overcome the decrease of an accuracy rate. Hereafter, it is possible to adapt in the future soldier system and expected that the accuracy rate of the conventional gun is maintained.

• 한국신뢰성학회지:신뢰성응용연구
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• 제13권2호
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• pp.99-107
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• 2013

One-shot device is required to successfully perform its function only once at the moment of use. The reliability of a one-shot device should be expressed as a probability of success. In this paper, we propose a bayesian approach for estimating reliability of one-shot devices with small sample size. We employ a gamma prior to obtain the posterior distribution. Finally, we compare the accuracy of the proposed method with general maximum likelihood method.