A new nonlinear guidance logic, that has demonstrated superior performance in guiding unmanned air vehicles (UAVs) on curved trajectories, is presented. The logic approximates a proportional-derivative controller when following straight line path, but the also contains an element of anticipatory control enabling tight tracking paths. method uses inertial speed computation commanded lateral acceleration and adds adaptive capability to change vehicle due external disturbances, such as wind....

Performance and stability are demonstrated for a nonlinear path-following guidance method unmanned air vehicles. The was adapted from pure pursuit-based path following, which has been widely used in ground based robot applications. is known to approximate proportional-derivative controller when following straight line path, but it shown that there also an element of anticipatory control enables tight tracking curved paths. Ground speed incorporated into the computation commanded lateral...

A three-dimensional nonlinear guidance law for path-following is proposed using differential geometry of space curves. The makes a vehicle converge to and then follow given desired path general shape, which does not require strict restrictions on initial position velocity. To take the advantages look-ahead effect precise robust path-following, takes form pure pursuit guidance, designed align velocity with vector. angle radially shifted distance are path. generates normal acceleration command...

Deformable surface tracking from monocular images is well-known to be under-constrained. Occlusions often make the task even more challenging, and can result in failure if not sufficiently textured. In this work, we explicitly address problem of 3D reconstruction poorly textured, occluded surfaces, proposing a framework based on template-matching approach that scales dense robust features by relevancy score. Our extensively compared current methods employing both local feature matching...

Fashion image retrieval (FIR) is a challenging task, which requires searching for exact items accurately from massive collections of fashion products based on query image. Despite recent advances, FIR still has limitations application to real-world visual searches. The main reason this not only the trade-off between model complexity and performance, but also common nature images captured under uncontrolled circumstances (e.g. varying viewpoints lighting conditions). In particular, are...

Abstract We test a set of inequalities in choice probabilities, shown to be necessary and sufficient for random utility by Falmagne (1978). run an experiment which each 141 participants chooses six times from doubleton or larger subset universe five lotteries. compute Bayes factors favour utility, versus alternative with unrestricted probabilities. There is strong evidence that large majority satisfy utility; however, there against four participants. Results are fairly robust the prior.

This study presents a method to adjust the waypoints of an unpowered air vehicle compensate for influence wind on trajectory. A framework combining preflight waypoint planning and inflight adjustment is proposed. In offline phase, optimal trajectories under various profile combinations are generated by using direct optimization method. Waypoints extracted from obtained each condition. Then, deviations due corresponding trajectory zero-wind case obtained; these used construct models deviation...

This paper presents a method to estimate steady wind and maneuvering strategy for loitering under strong, wind. The estimation uses Global Positioning System velocity only through novel filter design without airspeed measurement. is then used guide the aircraft crab in direction perpendicular wind, thereby avoiding large changes flight variables if an orbit-type maneuver attempted. proposed demonstrated tests.

A formation flight guidance logic that enables the leader-follower station keeping between two UAVs is presented in this paper. The motivated by investigation of relation proportional navigation and nonlinear trajectory tracking law, simplicity method provides computational efficiency allows easy implementation. An excellent performance proposed demonstrated via various numerical simulations for multiple environment.

We examined risky sexual choice under the lens of rational decision-making. Participants ( N = 257) completed a novel sexual-choice task in which they selected from among hypothetical partners varying physical attractiveness and probability that one would contract sexually transmitted infection (STI) one-time encounter with them. found nearly all participants evaluated alternatives coherent fashion consistent utility-based theories choice. In subsequent analyses, we classified participants’...