• 융합신호처리학회 학술대회논문집
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• 한국신호처리시스템학회 2000년도 하계종합학술대회논문집
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• pp.5-8
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• 2000

This paper introduced a scheme for finding an optimal association matrix that represents the relationships between the measurements and tracks in multi-target tracking of Radar system. We considered the relationships between targets and measurements as MRF and assumed a priori of the associations as a Gibbs distribution. Based on these assumptions, it was possible to reduce the MAP estimate of the association matrix to the energy minimization problem. After then, we defined an energy function over the measurement space, that may incorporate most of the important natural constraints.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제16권12호
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• pp.3976-3990
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• 2022

Currently, cross-attention is widely used in Siamese trackers to replace traditional correlation operations for feature fusion between template and search region. The former can establish a similar relationship between the target and the search region better than the latter for robust visual object tracking. But existing trackers using cross-attention only focus on rich semantic information of high-level features, while ignoring the appearance information contained in low-level features, which makes trackers vulnerable to interference from similar objects. In this paper, we propose a Multi-level Cross-attention Siamese network(MCSiam) to aggregate the semantic information and appearance information at the same time. Specifically, a multi-level cross-attention module is designed to fuse the multi-layer features extracted from the backbone, which integrate different levels of the template and search region features, so that the rich appearance information and semantic information can be used to carry out the tracking task simultaneously. In addition, before cross-attention, a target-aware module is introduced to enhance the target feature and alleviate interference, which makes the multi-level cross-attention module more efficient to fuse the information of the target and the search region. We test the MCSiam on four tracking benchmarks and the result show that the proposed tracker achieves comparable performance to the state-of-the-art trackers.

• 복식
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• 제54권3호
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• pp.53-64
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• 2004

The study was done to provide domestic fashion multi-shops with basic information about the product and price strategies through an investigation the marketing strategies for domestic multi-shop dealt with imported product only. Data were collected from Interview with a buyer or a staff of marketing department of Domestic Fashion Multi-shop dealt with Imported Product only. Through the study, it was clarified that these multi-shops showed a tendency to compose of promising brands. brands set a high value on unique character or technique, and brands of promising designer noticed at the main collection. And they also extended their lines as a total life style shop dealt with accessory. shoes and home collection as well as clothing. Therefore, they had to analyze their target consumer's life style and applied this to organization of product, brands or sizing. To maintain the balance of multi-shop they bought products keeping the balance between all the brands and didn't lose variety of concept, it was demanded to develop new brands as well. Their distribution channels had to be planned by regional characteristic that could be accepted their target consumers.

• 전자공학회논문지
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• 제53권6호
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• pp.146-151
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• 2016

본 논문에서는 등속 직선 기동하는 수중표적의 CPA 상황에서의 방위각 정보를 이용하여 표적의 CPA 거리와 속도의 비를 추정하는 기법을 제시한다. 선행 연구를 통해 근접센서를 이용한 포락선 CPA 기법으로 이 값을 추정하는 방안이 제시되었으나, 이는 표적과 수신 센서의 거리가 가깝거나 다중경로로 인한 간섭효과가 커질 경우 성능이 떨어지는 문제를 가진다. 이에 이를 극복하는 방안으로 표적 방위각 정보를 이용하는 방위각 CPA 기법을 제시한다.

• 한국컴퓨터정보학회논문지
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• 제16권8호
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• pp.129-135
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• 2011

본 논문에서는 다중 빔 형성기법을 이용하여 다중 목표물들의 고각을 추정하는 방법을 제안한다. 이 방법은 배열 소자로 수신되는 신호들을 디지털로 처리해 수신 빔을 스택 빔으로 만들고, 빔 형성기에서는 안테나 소자에 가중치를 적용함으로서 원하는 수신 빔을 생성 할 수 있다. 이때 스택 빔을 구현하기 위해서는 여러 개의 값비싼 위상천이기 필요하지만, 현재는 컴퓨터의 성능이 많이 향상되어 위상변위기 대신에 고속 푸리에 변환을 이용하여 다중스택 빔을 형성한다. 또한 수신기에서 원하는 방향으로 빔을 조향하기 위해서 빔 조향 오차 보정 기법을 적용하여 다중 빔의 지향성을 향상 시킨다. 본 논문에서는 시뮬레이션을 통하여 고속 후리어 변환과 빔 조향오차 보정 기법에 근거를 둔 제안된 고각 추정방법이 기존의 방법에 비해 목표물 추정 면에서 우수함을 보인다.

• 시스템엔지니어링학술지
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• 제12권2호
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• pp.47-57
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• 2016

As the inventory costs of repairable items in military logistics continue to increase, many studies for optimal inventory level of these items are being carried out in advanced countries, including the US, to reduce these costs. Research on inventory level optimization for repairable items aimed to achieve the availability goal of a system with a MIME(Multi Indenture Multi Echelon) repair policy structure first began with Sherbrooke's METRIC and developed into various types. This research is to analyze and compare recent V-METRIC related studies to search for another variation in this field. This paper mainly looks at how to determine optimum inventory level for each repairable item to achieve a specific availability target within a limited budget, and also how to minimize inventory cost while achieving its availability target by determining optimal inventory level of each repairable item.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2011년도 추계학술대회
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• pp.361-363
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• 2011

다기능관측경은 주.야 관측이 가능하고, 레이저거리측정기로 표적의 거리측정 뿐만 아니라, 위성항법장치와 자북측정기를 활용하여 표적의 좌표를 정확하게 알아낼 수 있는 휴대용 관측경이다. 본 논문에서는 이러한 다기능관측경의 운용개념 및 소형화, 최경량 구현을 통해 최고의 성능과 최경량을 구현하는 방법에 대해 소개하고자 한다.

• 한국전자파학회논문지
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• 제25권12호
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• pp.1275-1283
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• 2014

PCM(Pulse Code Modulation) 파형은 펄스에 특정 code를 실어 보내는 형태로 추적에 적합한 특성을 가진다. 특히 단일 펄스의 송수신만으로 표적의 탐지 및 추적이 가능하므로, 여러 임무를 수행해야 하는 다기능 레이다(MFR: Multi-Function Radar)에서는 시간 측면에서 효율적이다. 하지만 PCM 파형은 모호성 함수(ambiguity function) 의 특성으로 인해 표적을 탐지하고, 거리와 속도 정보를 얻기 위해서 도플러 필터 뱅크(Doppler filter bank)가 필요하다. 본 논문에서는 계산량과 하드웨어 측면에서 한계가 있는 도플러 필터 뱅크를 사용하는 대신, ML(Maximum Likelihood) 기반의 도플러 추정 방법을 고안하였다. 제안한 알고리즘은 폐형(closed form) 수식의 suboptimal 방법으로 적은 계산량으로 정확한 도플러 주파수를 추정할 수 있고, 이를 기반으로 표적의 탐지에 적용할 수 있다.

• Journal of the Korean Data and Information Science Society
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• 제14권2호
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• pp.237-245
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• 2003

MDS(multi-dimensional scaling) for preference data is a graphical tool which usually figures out how consumers recognize, evaluate certain products. This article is mainly concerned with an optimal scaling for MDS when target configuration is available. Rotation of axis and SUR(seemingly unrelated regression) methods are employed to get a new configuration which is obtained as close to the target as we can. Methodologies developed here are also illustrated via a real data set.

• International Journal of Aeronautical and Space Sciences
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• 제18권3호
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• pp.522-534
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• 2017

According to the characteristics of salvo attack for the multiple flight vehicles (MFV), the design of cooperative guidance law can be converted into the consensus problem of multi-vehicle system through the concept of multi-agent cooperative control. The flight vehicles can be divided into leader and followers depending on different functions, and the flight conditions of leader are independent of the ones of followers. The consensus problem of leader-follower multi-vehicle system is researched by graph theory, and the consensus protocol is also presented. Meanwhile, the finite time guidance law is designed for the flight vehicles via the finite time control method, and the system stability is also analyzed. Whereby, the guidance law can guarantee the line of sight (LOS) angular rates converge to zero in finite time, and hence the cooperative attack of the MFV can be realized. The effectiveness of the designed cooperative guidance method is validated through the simulation with a stationary target and a moving target, respectively.