7,475 research outputs found
Robust Multi-Object Tracking With Local Appearance and Stable Motion Models
No full textMulti-object tracking (MOT) has been steadily studied for video understanding in computer vision. However, existing MOT frameworks usually employ straightforward appearance or motion models and may struggle in dynamic environments with similar appearance and complex motion. In this paper, we present a robust MOT framework with local appearance and stable motion models to overcome these two hindrances. The framework incorporates object and local part detectors, a feature extractor, a keypoint extractor, and a data association method. For the data association, we utilize five types of similarity metrics and a cascaded matching strategy. The local appearance model is suggested to be used additionally with global appearance features of full bounding boxes to obtain discriminative features even for objects with a similar appearance. At the same time, the stable motion model considers the core of the body as the central point of the object and subdivides the body using a novel 12-tuple Kalman state vector to analyze complex motion. As a result, our new tracker achieves state-of-the-art performance on the DanceTrack test set, surpassing all other listed tracking systems in terms of both detection and tracking quality metrics, obtaining 61.3 HOTA, 82.3 DetA, 45.8 AssA, and 91.7 MOTA. The source code is available at https://github.com/Jubi-Hwang/Robust-MOT-with-Local-Appearance-and-Stable-Motion-Models
Wars of attrition with spending constraints
No full textWe study wars of attrition with spending constraints. Specifically, there are two players with different values of the prize and costs of continuing wars, and they are endowed with limited budgets that can be used during the war. Two players compete by choosing the time at which they intend to give up within the constraints. We find the constrained mixed strategy equilibrium for this model and provide a full characterization of equilibrium depending on whether each player's constraint is binding or nonbinding.
균열암반 내에서 네트웍 저항 모델을 이용한 핵종 이동에 대한 연구
No full text학위논문(석사) - 한국과학기술원 : 원자력공학과, 2000.2, [ vii, 34 p. ]Before the actual construction of radioactive waste repository, analysis of radionuclide transport is required to predict the radiological effect on public and environment. Many models have been developed to predict the realistic radionuclide transport through the repository.
In this study, Network Resistance Model (NRM) that is similar to electrical circuit network is adopted to simulate the radionuclide transport. NRM assume the media of repository as the resistance of the radionuclide transport and describes the transport phenomena of radionuclide by connecting the resistance as network. NRM is easy to apply to describe complex system and take less calculation time compared to the other model. The object of this study is to develop the fast, simple and efficient calculation method to simulate the radionuclide with the newly adopted concept using network resistance.
New system configuration specially focused on rock edge region is introduced by dividing the rock matrix. By dividing the rock edge from the main rock matrix region, the rock edge region is more carefully analyzed and compared. Rock edge region can accelerate radionuclide transport due to the reducing effect on the total resistivity of rock matrix.
Therefore, increased radioactive dose is expected when we apply NRM methodology in the performance assessment of the repository. Result of the performance assessment can be more conservative and reliable. NRM can be applied to other system configuration and for more complex pathways. NRM is simple to us e and easy to modify than any other modeling method.한국과학기술원 : 원자력공학과
Pulsed high magnetic field sensor using polymethyl methacrylate
No full text학위논문(박사) - 한국과학기술원 : 물리학과, 2006.8, [ vi, 89 p. ]펄스형 power 기술분야에서 펄스형 고 자기장의 정확하고 노이즈가 없는 측정은 특히 화약으로 구동되는 나선형 자속압축장치(HMCG)의 성능 평가에 필수적이다. 이 논문에서 나선형 자속압축장치(HMCG)에 의해 발생된 펄스형 고 자기장 측정을 위해 polymethyl methacrylate를 패러데이 효과 자기장 센서의 센서매질로 사용할 것을 제안하고 설명한다. PMMA로 제작된 센서매질들의 자기광학적 성질들이 연구된다. PMMA를 주의깊게 열처리함으로써 내적인 선복굴절이 실질적으로 억압된다. 열처리된 PMMA 센서매질에 대해 의 베르데 상수와 의 VL(센서매질의 베르데 상수와 길이의 곱)의 정규화된 온도 의존성들이 측정된다. 열처리된 PMMA 센서매질로 제작된 센서들로 ~27 kG까지의 펄스형 자기장이 측정되고 inductive 프로브로 측정된 결과들과 비교된다. 이들 결과들은 이내로 잘 일치한다. 센서의 응용으로서 화약에 의해 구동되는 HMCG로 발생된 펄스형 자기장 측정에 열처리된 PMMA 센서가 사용된다.한국과학기술원 : 물리학과
경수로에서 장반감기 핵분열생성핵종의 방사능에 대한 모델 개발 및 적용에 관한 연구
No full text학위논문(박사) - 한국과학기술원 : 원자력및양자공학과, 2006.2, [ xiiv, 122 p. ]It requires estimating difficult-to-measure (DTM) radionuclides, especially PDTM (particularly DTM) radionuclides such as I-129 and Tc-99, in the waste package generated from nuclear power plants (NPPs) prior to shipment to disposal facility. These radionuclides are critical nuclides for the disposal of low and intermediate level waste because they dominate radiation dose through ground water. Therefore, their activities in each waste package should be accurately identified prior to disposal. However, their activities cannot be analyzed by routine measurement techniques used in NPPs because these PDTM radionuclides are non-gamma emitters. Therefore, instead of direct measurement, scaling factor method is typically used to estimate the quantity of the PDTM radionuclides in the waste package. The scaling factor is empirically derived ratio or correlation between a reference gamma emitting radionuclide, which can be easily measured at NPPs, and the non-gamma emitting radionuclide. The scaling factor is typically derived from a set of waste samples analyzed at commercial laboratories for both gamma and DTM radionuclides. However, in general, the concentrations of PDTM radionuclides in low-level waste are too low to be detected by the conventional measurement techniques i.e., photon counting method. When the lower limit of detection rather than the actually analyzed concentration is used for scaling factor, the determination of the scaling factor value is difficult but also the value generally involves a large uncertainty. In addition, the activity of radionuclide in radioactive wastes can be highly overestimated. Therefore, theoretical approaches have been proposed as a means of estimating activity or scaling factor for PDTM radionuclides, especially . Also, evaluations of the inventory are generally based on the release of related fission products from the source term such as defective fuel and tramp uranium. However, in these approaches, the ratio ...한국과학기술원 : 원자력및양자공학과
Conventional contracts, intentional behavior and logit choice:Equality without symmetry
No full textWhen coordination games are played under the logit choice rule and there is intentional bias in agents’ non-best response behavior, we show that the Egalitarian bargaining solution emerges as the long run social norm. Without intentional bias, a new solution, the Logit bargaining solution emerges as the long run norm. These results contrast with results under non-payoff dependent deviations from best response behavior, where it has previously been shown that the Kalai-Smorodinsky and Nash bargaining solutions emerge as long run norms. We complement the theory with experiments on human subjects, results of which suggest that non-best response play is payoff dependent and displays intentional bias. This suggests the Egalitarian solution as the most likely candidate for a long run bargaining norm
Simple Characterizations of Potential Games and Zero-sum Equivalent Games
No full textWe provide several tests to determine whether a game is a potential game or whether it is a zero-sum equivalent game—a game which is strategically equivalent to a zero-sum game in the same way that a potential game is strategically equivalent to a common interest game. We present a unified framework applica-ble for both potential and zero-sum equivalent games by deriving a simple but useful characterization of these games. This allows us to re-derive known criteria for potential games, as well as obtain several new criteria. In particular, we prove (1) new integral tests for potential games and for zero-sum equivalent games, (2) a new derivative test for zero-sum equivalent games, and (3) a new representation characterization for zero-sum equivalent games.
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