Gotowe bibliografie tematyczne / Minimum-time Guidance

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Gotowa bibliografia na temat „Minimum-time Guidance”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Minimum-time Guidance"

Yamaoka, Seiji. "Minimum-Time Guidance and Control Law for High Maneuvering Missile". International Journal of Aeronautical and Space Sciences 10, nr 1 (30.05.2009): 46–58. http://dx.doi.org/10.5139/ijass.2009.10.1.046.

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UENO, Seiya. "Minimum-Time Turns of Aircraft by Feedback Guidance and Control Law." Journal of the Japan Society for Aeronautical and Space Sciences 45, nr 516 (1997): 29–35. http://dx.doi.org/10.2322/jjsass1969.45.29.

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Indig, Nahshon, Joseph Z. Ben-Asher i Erez Sigal. "Near-Optimal Minimum-Time Guidance Under Spatial Angular Constraint in Atmospheric Flight". Journal of Guidance, Control, and Dynamics 39, nr 7 (lipiec 2016): 1563–77. http://dx.doi.org/10.2514/1.g001485.

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Ariba, Yassine, Denis Arzelier i Laura Sofia Urbina-Iglesias. "Minimum-Fuel Fixed-Time Impulsive Elliptic Glide-Slope Guidance Algorithms Using Semidefinite Programming". Journal of Guidance, Control, and Dynamics 41, nr 9 (wrzesień 2018): 1873–87. http://dx.doi.org/10.2514/1.g003395.

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Alamir, Mazen. "Nonlinear receding horizon sub-optimal guidance law for the minimum interception time problem". Control Engineering Practice 9, nr 1 (styczeń 2001): 107–16. http://dx.doi.org/10.1016/s0967-0661(00)00085-x.

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Zhou, Guanqun, i Qunli Xia. "A Guidance Strategy for Strapdown Seeker considering Minimum Field-of-View Angle Constraint". International Journal of Aerospace Engineering 2020 (19.06.2020): 1–11. http://dx.doi.org/10.1155/2020/5247257.

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An off-axis strapdown seeker in missile may lead to a minimum field-of-view (FOV) angle constraint problem. The goal of this paper is to deal with the problem in guidance. Analysis of kinematics proves that on the premise of attacking stationary target, seeker look angle comes to 0 before or at the end time, and seeker will lose target finally. In order to reduce the distance of seeker losing target, a guidance strategy is proposed to sustain minimum FOV angle constraint during flight. The strategy can be applied on guidance laws with independent orders in longitudinal and lateral channels. By means of a certain rolling maneuver, it keeps the target in the seeker’s limited FOV. Moreover, a lateral guidance order compensation is utilized in the strategy to maintain seeker look angle. Simulations and comparisons are conducted to demonstrate the strategy’s effectiveness. Results show that the guidance strategy can sustain minimum FOV angle constraint longer than classical guidance method.

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Wu, Zhenglong, Zhenyu Guan, Chengwei Yang i Jie Li. "Terminal Guidance Law for UAV Based on Receding Horizon Control Strategy". Complexity 2017 (2017): 1–19. http://dx.doi.org/10.1155/2017/2750172.

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Terminal guidance law against the maneuvering target is always the focal point. Most of the literatures focus on estimating the acceleration of target and time to go in guidance law, which are difficult to acquire. This paper presents a terminal guidance law based on receding horizon control strategy. The proposed guidance law adopts the basic framework of receding horizon control, and the guidance process is divided into several finite time horizons. Then, optimal control theory and target motion prediction model are used to derive guidance law for minimum time index function with continuous renewal of original conditions at the initial time of each horizon. Finally, guidance law performs repeated iteration until intercepting the target. The guidance law is of subprime optimal type, requiring less guidance information, and does not need to estimate the acceleration of target and time to go. Numerical simulation has verified that the proposed guidance law is more effective than traditional methods on constant and sinusoidal target with bounded acceleration.

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Ariba, Yassine, Denis Arzelier i Laura Sofia Urbina. "A New Glideslope Guidance Algorithm for Minimum-Fuel Fixed-Time Elliptic Rendezvous Using Semidefinite Programming". IFAC-PapersOnLine 50, nr 1 (lipiec 2017): 7235–40. http://dx.doi.org/10.1016/j.ifacol.2017.08.1369.

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Kim, Kangsoo, i Tamaki Ura. "Applied Model-Based Analysis and Synthesis for the Dynamics, Guidance, and Control of an Autonomous Undersea Vehicle". Mathematical Problems in Engineering 2010 (2010): 1–23. http://dx.doi.org/10.1155/2010/149385.

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Model-based analysis and synthesis applied to the dynamics, guidance, and control of an autonomous undersea vehicle are presented. As the dynamic model for describing vehicle motion mathematically, the equations of motion are derived. The stability derivatives in the equations of motion are determined by a simulation-based technique using computational fluid dynamics analysis. The dynamic model is applied to the design of the low-level control systems, offering model-based synthetic approach in dynamics and control applications. As an intelligent navigational strategy for undersea vehicles, we present the optimal guidance in environmental disturbances. The optimal guidance aims at the minimum-time transit of a vehicle in an environmental flow disturbance. In this paper, a newly developed algorithm for obtaining the numerical solution of the optimal guidance law is presented. The algorithm is a globally working procedure deriving the optimal guidance in any deterministic environmental disturbance. As a fail-safe tactic in achieving the optimal navigation in environments of moderate uncertainty, we propose the quasi-optimal guidance. Performances of the optimal and the quasi-optimal guidances are demonstrated by the simulated navigations in a few environmental disturbances.

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Li, Bin, Defu Lin, Jiang Wang i Song Tian. "Guidance law to control impact angle and time based on optimality of error dynamics". Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 233, nr 10 (24.09.2018): 3577–88. http://dx.doi.org/10.1177/0954410018801226.

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In this work, a new guidance law with a meaningful performance index is designed to satisfy terminal impact angle and impact time constraints based on optimal error dynamics, which can be used for salvo attacks or cooperative missions of multi-missile. The analytical solution of the proposed guidance law is a combination of trajectory shaping guidance law and an additional impact time error feedback term that is proportional to the difference between the desired and the true impact times. Trajectory shaping guidance law aims to achieve the desired terminal impact angle and zero miss distance, whereas the extra term aims to meet the desired impact time. The minimum and maximum feasible impact times that consider the seeker's field-of-view limit, terminal impact angle constraint, and missile's maneuvering acceleration limit are calculated to provide the feasible boundary range of the desired impact time. Numerical simulations of several engagement situations demonstrate the effectiveness of the proposed guidance law in the accuracy of terminal impact angle and impact time.

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Rozprawy doktorskie na temat "Minimum-time Guidance"

Visser, Hendrikus. "Energy management of three-dimensional minimum-time intercept". Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/49954.

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A real-time computer algorithm to control and optimize aircraft flight profiles is described and applied to a three-dimensional minimum-time intercept mission. The proposed scheme has roots in two well-known techniques: singular perturbations and neighboring-optimal guidance. Use of singular-perturbation ideas is made in terms of the assumed trajectory-family structure. A heading/energy family of prestored point-mass-model state-Euler solutions is used as the baseline in this scheme. The next step is to generate a near-optimal guidance law that will transfer the aircraft to the vicinity of this reference family. The control commands fed to the autopilot consist of the reference controls plus correction terms which are linear combinations of the altitude and path-angle deviations from reference values, weighted by a set of precalculated gains. In this respect the proposed scheme resembles neighboring-optimal guidance. However, in contrast to the neighboring-optimal guidance scheme, the reference control and state variables as well as the feedback gains are stored as functions of energy and heading in the present approach. A detailed description of the feedback laws and of some of the mathematical tools used to construct the controller is presented. The construction of the feedback laws requires a substantial preflight computational effort, but the computation times for on-board execution of the feedback laws are very modest. Other issues relating to practical implementation are addressed as well. Numerical examples, comparing open-loop optimal and approximate feedback solutions for a sample high-performance fighter, illustrate the attractiveness of the guidance scheme. Optimal three-dimensional flight in the presence of a terrain limit is studied in some detail.
Ph. D.
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Anisi, David A. "On Cooperative Surveillance, Online Trajectory Planning and Observer Based Control". Doctoral thesis, KTH, Optimeringslära och systemteori, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9990.

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The main body of this thesis consists of six appended papers. In the first two, different cooperative surveillance problems are considered. The second two consider different aspects of the trajectory planning problem, while the last two deal with observer design for mobile robotic and Euler-Lagrange systems respectively.In Papers A and B, a combinatorial optimization based framework to cooperative surveillance missions using multiple Unmanned Ground Vehicles (UGVs) is proposed. In particular, Paper A considers the the Minimum Time UGV Surveillance Problem (MTUSP) while Paper B treats the Connectivity Constrained UGV Surveillance Problem (CUSP). The minimum time formulation is the following. Given a set of surveillance UGVs and a polyhedral area, find waypoint-paths for all UGVs such that every point of the area is visible from a point on a waypoint-path and such that the time for executing the search in parallel is minimized. The connectivity constrained formulation extends the MTUSP by additionally requiring the induced information graph to be kept recurrently connected at the time instants when the UGVs perform the surveillance mission. In these two papers, the NP-hardness of both these problems are shown and decomposition techniques are proposed that allow us to find an approximative solution efficiently in an algorithmic manner.Paper C addresses the problem of designing a real time, high performance trajectory planner for an aerial vehicle that uses information about terrain and enemy threats, to fly low and avoid radar exposure on the way to a given target. The high-level framework augments Receding Horizon Control (RHC) with a graph based terminal cost that captures the global characteristics of the environment. An important issue with RHC is to make sure that the greedy, short term optimization does not lead to long term problems, which in our case boils down to two things: not getting into situations where a collision is unavoidable, and making sure that the destination is actually reached. Hence, the main contribution of this paper is to present a trajectory planner with provable safety and task completion properties. Direct methods for trajectory optimization are traditionally based on a priori temporal discretization and collocation methods. In Paper D, the problem of adaptive node distribution is formulated as a constrained optimization problem, which is to be included in the underlying nonlinear mathematical programming problem. The benefits of utilizing the suggested method for online trajectory optimization are illustrated by a missile guidance example.In Paper E, the problem of active observer design for an important class of non-uniformly observable systems, namely mobile robotic systems, is considered. The set of feasible configurations and the set of output flow equivalent states are defined. It is shown that the inter-relation between these two sets may serve as the basis for design of active observers. The proposed observer design methodology is illustrated by considering a unicycle robot model, equipped with a set of range-measuring sensors. Finally, in Paper F, a geometrically intrinsic observer for Euler-Lagrange systems is defined and analyzed. This observer is a generalization of the observer proposed by Aghannan and Rouchon. Their contractivity result is reproduced and complemented by a proof that the region of contraction is infinitely thin. Moreover, assuming a priori bounds on the velocities, convergence of the observer is shown by means of Lyapunov's direct method in the case of configuration manifolds with constant curvature.
QC 20100622
TAIS, AURES

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WANG, LIANG-DENG, i 王亮登. "A research of minimum time command control for line of sight guidance law". Thesis, 1988. http://ndltd.ncl.edu.tw/handle/55511007091684363211.

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Yadav, Sparsh. "Direct Methods for Optimal Ascent Guidance". Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5761.

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An ascent guidance algorithm determines the thrust vector that allows the spacecraft to reach the desired orbit. Generally, optimal ascent guidance algorithms try to reach the orbit while minimizing mission time or fuel. A renewed interest in new-generation space missions necessitates the development of optimal ascent guidance algorithms that are efficient in time and control and can accommodate ever-changing mission constraints. These guidance algorithms will pave the way for future autonomous space exploration. The first part of this thesis develops an ascent guidance algorithm that guides a spacecraft from a known initial position to an orbit of known apogee and perigee in minimum time. The algorithm follows an iterative approach that reduces the terminal error over successive iterations while keeping the control inputs within bounds. Every iteration consists of a model-predicting phase in which the initial conditions and system dynamics are used to calculate the error at the end of guidance. It is followed by an optimization phase that helps us to minimize time and accommodate path constraints. Numerical simulations are carried out using a point mass model of a spacecraft. The initial guess for control that is required for simulations is generated using an existing polynomial guidance method. Next, we study the algorithm's behavior for different guess inputs of the thrust and the final time. Further analysis is carried out by varying the learning parameter and initial position of the spacecraft. Finally, we do a comparative study of the algorithm with commercially available optimal control solvers. Simulation results show faster convergence of the proposed minimum-time algorithm compared to other optimal control software. Another essential and desirable characteristic of a guidance algorithm is lower control effort spent in achieving the mission objective. In the second part of this thesis, we augment the cost function of the algorithm with a weighted running cost on the control effort. The weights of the running cost allow us to tune the algorithm to achieve a balance between the mission time and the control effort invested in guidance. Numerical simulations are carried out to analyze algorithm behavior for different initial conditions and by steadily increasing the weight of the running cost. As the main result, we observe that the control effort can be reduced signi ficantly with a correspondingly small trade-off in mission time.

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Książki na temat "Minimum-time Guidance"

Energy management of three-dimensional minimum-time intercept: Interim report. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1985.

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Części książek na temat "Minimum-time Guidance"

Wilkie, Simeon, Ana Paula Arato Goncalves, Susan Macdonald, Elisabeth Marie-Victoire, Myriam Bouichou, Jean Ducasse-Lapeyrusse, Nicki Lauder, David Farrell, Paul Gaudette i Ann Harrer. "Performance Evaluation of Patch Repairs on Historic Concrete Structures (PEPS): An Overview of the Project Methodology". W Conservation and Restoration of Historic Mortars and Masonry Structures, 288–99. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-31472-8_22.

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AbstractThe development of reinforced concrete through the 20th century has resulted in a wealth of culturally significant concrete structures around the world. However, as a relatively modern material durability issues were not fully understood at the time of construction, and many of these structures require ongoing interventions as a result. While there is now a general acceptance of the importance of concrete heritage from this era, there few widely accepted guidelines on the approach to its preservation and conservation. In particular, despite many studies and published guidance on concrete repair and the performance of concrete repairs, there are few on the long-term performance of patch repairs designed to match the aesthetic of the original while simultaneously keeping loss of the original fabric to a minimum. As a response to this challenge, three institutions, the Getty Conservation Institute (GCI), Historic England (HE) and Laboratoire de Recherche des Monuments Historiques (LRMH) are collaborating on The Performance Evaluation of Patch Repairs on Historic Concrete Structures (PEPS) to produce practical guidance that will help those repairing historic concrete. This paper provides an overview of the assessment methodology that has been developed as part of this international collaboration.

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Kim, Kangsoo. "Reconfigurable Minimum-Time Autonomous Marine Vehicle Guidance in Variable Sea Currents". W Automation and Control [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.92013.

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Shubik, Martin, i Eric Smith. "The Context of Competition". W The Guidance of an Enterprise Economy. The MIT Press, 2016. http://dx.doi.org/10.7551/mitpress/9780262034630.003.0001.

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This chapter sets the context for the book. We note the purpose of economics should be to describe concepts and models that can be made consistent with sound scientific understanding of the other aspects of life. At a minimum economic behaviour is embedded within the organic system we call the society: it affects extraction, production, utilization, exchange, consumption and disposal of physical entities and services. We consider the main questions about how to contextualize economics. It can be argued that the economy is a mechanism to organize a subset of decisions in a larger highly distributed society. The social organization obeys no simple model of control; its dynamics is often evolutionary at many scales of time, space and material content; and with these it is subject to both historical contingency and great complexity.

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Bartulec, Christine, Rachel Freedman, Amy Hughes, Sanja Janjanin, Bruce McCormick, Wayne Morriss i Andrea Reis. "Organizing Your Environment". W Global Anaesthesia, 21–38. Oxford University Press, 2020. http://dx.doi.org/10.1093/med/9780198809821.003.0002.

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One of the challenges when moving from a high- to low-resource setting is having to take more direct responsibility for your own drugs and equipment than you may be used to. In some circumstances you may be starting from nothing and may have limited time to get ‘up and running’. The chapter focuses on practical aspects of setting up an anaesthetic service in resource-poor locations. It contains sections on the minimum expected standards for drugs, equipment, and staffing. As well the operating theatre environment it also contains sections on setting up an emergency room (ER), critical care area, and recovery area, as well as guidance on triage of patients.

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Kabir, Raihan, Yutaka Watanobe, Keitaro Naruse i Rashedul Islam. "Effectiveness of Robot Motion Block on A-Star Algorithm for Robotic Path Planning". W Frontiers in Artificial Intelligence and Applications. IOS Press, 2022. http://dx.doi.org/10.3233/faia220241.

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Efficient path planning and minimization of path movement costs for collision-free faster robot movement are very important in the field of robot automation. Several path planning algorithms have been explored to fulfill these requirements. Among them, the A-star (A*) algorithm performs better than others because of its heuristic search guidance. However, the performance, effectiveness, and searching time complexity of this algorithm mostly depends on the robot motion block to search for the goal by avoiding obstacles. With this challenge kept in mind, this paper proposes an efficient robot motion block with different block sizes for the A* path planning algorithm. The proposed approach reduces robots’ path cost and time complexity to find the goal position as well as avoid obstacles. In this proposed approach, grid-based maps are used where the robot’s next move is decided by searching eight directions among the surrounding grid points. However, the proposed robot motion blocks size has a significant effect on path cost and time complexity of the A* path planning algorithm. For the experiment and to validate the efficiency of the proposed approach, an online benchmarked dataset is used. The proposed approach is applied on thousands of different grid maps with various obstacles, starting, and goal positions. The obtained results from the experiment show that the presented robot motion blocks reduce the robot’s pathfinding time complexity and number of search nodes by maintaining a minimum path cost towards the goal position.

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Zhang, Lei, Shuaidan Li, Aohao Liu, Wei Wang, Jiarui Wang, Jun Bao i Xiaojiang Li. "Improved Evaluation Method of Coal Spontaneous Combustion/Oxidation Characteristics". W Advances in Transdisciplinary Engineering. IOS Press, 2022. http://dx.doi.org/10.3233/atde220381.

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Coal spontaneous combustion often occurs in storage processes, especially for low-rank coal with high volatile materials, which may lead coal yard caught fire and coal thermal energy losses. Therefore, it is important to accurately predict the spontaneous combustion tendency under coal storage status in real time. In order to determine the ignition point, the existing methods are all using pulverized coal samples, adding special oxidant artificially and then heating to accelerate the oxidation process. The particle size and the test conditions of those methods were quite different from the real coal storage condition. This research developed a new test method to evaluate the spontaneous combustion tendency. The method used granular coal samples, which the particle size is similar to its storage process, to test its temperature increasing under the humidity, pressure and air flow which are similar to its storage conditions. The spontaneous combustion tendency was judged by the temperature rise rate V70 of the sample at 69°C–71°C in adiabatic heating condition. 10 samples of different rank of Chinese coals were used to study. The results show that lignite had the largest low-temperature oxidation heating rate, and anthracite has the minimum. The lower coal moisture, the greater low-temperature oxidation heating rate. When the environment temperature is 70°C, with the increase of air flow rate, the rate of temperature rise increases firstly and then decreases. As environment temperatures rise, the temperature rise rate increases firstly and then decrease for the three types of coal samples, lignite has the maximum temperature rise rate, while anthracite has minimal temperature rising rate. Six kinds of coal samples were selected in order to verify the method precision. It was found that the temperature rise rate and repeatability limit of coal samples have linear correlation, and the basis for judgment and repeatability limit of the method are also provided. The method has high sensitivity and resolution of different coal ranks. According to the research, coal could be divided into three categories: strong spontaneous combustion tendency, medium spontaneous combustion tendency and weak spontaneous combustion tendency according to their temperature rise rate V70. The method could give great practical significant guidance for the scientific storage, blending, safety and efficient utilization of coal.

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Elsner, James B., i Thomas H. Jagger. "Graphs and Maps". W Hurricane Climatology. Oxford University Press, 2013. http://dx.doi.org/10.1093/oso/9780199827633.003.0008.

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Graphs and maps help you reason with data. They also help you communicate results. A good graph gives you the most information in the shortest time, with the least ink in the smallest space (Tufte, 1997). In this chapter, we show you how to make graphs and maps using R. A good strategy is to follow along with an open session, typing (or copying) the code as you read. Before you begin make sure you have the following data sets available in your workspace. Do this by typing . . . > SOI = read.table("SOI.txt", header=TRUE) > NAO = read.table("NAO.txt", header=TRUE) > SST = read.table("SST.txt", header=TRUE) > A = read.table("ATL.txt", header=TRUE) > US = read.table("H.txt", header=TRUE) . . . Not all the code is shown but all is available on our Web site. It is easy to make a graph. Here we provide guidance to help you make informative graphs. It is a tutorial on how to create publishable figures from your data. In R you have several choices. With the standard (base) graphics environment, you can produce a variety of plots with fine details. Most of the figures in this book use the standard graphics environment. The grid graphics environment is even more flexible. It allows you to design complex layouts with nested graphs where scaling is maintained upon resizing. The lattice and ggplot2 packages use grid graphics to create more specialized graphing functions and methods. The spplot function for example is plot method built with grid graphics that you will use to create maps. The ggplot2 package is an implementation of the grammar of graphics combining advantages from the standard and lattice graphic environments. It is worth the effort to learn. We begin with the standard graphics environment. A box plot is a graph of the five-number summary. The summary function applied to data produces the sample mean along with five other statistics including the minimum, the first quartile value, the median, the third quartile value, and the maximum. The box plot graphs these numbers. This is done using the boxplot function.

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Streszczenia konferencji na temat "Minimum-time Guidance"

SCHNEIDER, GARRET, i GEORGE WATT. "Minimum time turns using vectored thrust". W Guidance, Navigation and Control Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1988. http://dx.doi.org/10.2514/6.1988-4070.

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RAJAN, N. "Minimum time slewing of the SIRTF spacecraft". W Guidance, Navigation and Control Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1987. http://dx.doi.org/10.2514/6.1987-2527.

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Islam, Syed Aseem Ul, i Dennis Bernstein. "Minimum Time-of-Flight Interceptor Guidance Using Real-Time-Implementable Model-Predictive Guidance". W AIAA SCITECH 2022 Forum. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2022. http://dx.doi.org/10.2514/6.2022-1377.

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Seywald, Hans. "Optimal and suboptimal minimum time-to-climb trajectories". W Guidance, Navigation, and Control Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1994. http://dx.doi.org/10.2514/6.1994-3554.

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BRYSON, JR., ARTHUR. "Minimum-time motions of a two-arm robot". W Guidance, Navigation and Control Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1990. http://dx.doi.org/10.2514/6.1990-3395.

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Paley, Derek, Laszlo Techy i Craig Woolsey. "Coordinated Perimeter Patrol with Minimum-Time Alert Response". W AIAA Guidance, Navigation, and Control Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2009. http://dx.doi.org/10.2514/6.2009-6210.

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Etsuro Okuyama, Kazuyuki Igarashi, Hiroyuki Oda, Kazuhiro Miyazaki, Kohei Ohtsu i Tadatsugi Okazaki. "Guidance control of vessels using minimum time control". W 2007 IEEE International Conference on Systems, Man and Cybernetics. IEEE, 2007. http://dx.doi.org/10.1109/icsmc.2007.4413835.

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WIE, BONG, CHIEN-HSIUNG CHUANG i JOHN SUNKEL. "Minimum-time pointing control of a two-link manipulator". W Guidance, Navigation and Control Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1988. http://dx.doi.org/10.2514/6.1988-4117.

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HULL, DAVID, i JERRY RADKE. "Time-to-go prediction for a homing missile based on minimum-time trajectories". W Guidance, Navigation and Control Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1988. http://dx.doi.org/10.2514/6.1988-4064.

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Jardin, Matthew, i Arthur Bryson. "Methods for Computing Minimum-Time Paths in Strong Winds". W AIAA Guidance, Navigation, and Control Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2010. http://dx.doi.org/10.2514/6.2010-8398.

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Raporty organizacyjne na temat "Minimum-time Guidance"

Young. L51726 Guidelines for Riser Splash Zone Design and Repair. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), luty 1995. http://dx.doi.org/10.55274/r0010369.

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This report provides guidelines for riser and splash zone design, provides a detailed overview of existing riser repair techniques and products, and provides guidelines identifying the capabilities and limitations of riser reinstatement systems. The objectives of this study were to establish the current state of technology for riser design and capabilities of riser repair systems; and to provide guidance for selection of a repair system with minimum down time and loss for production in the event of unanticipated damage.

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Quinn, Meghan. Geotechnical effects on fiber optic distributed acoustic sensing performance. Engineer Research and Development Center (U.S.), lipiec 2021. http://dx.doi.org/10.21079/11681/41325.

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Distributed Acoustic Sensing (DAS) is a fiber optic sensing system that is used for vibration monitoring. At a minimum, DAS is composed of a fiber optic cable and an optic analyzer called an interrogator. The oil and gas industry has used DAS for over a decade to monitor infrastructure such as pipelines for leaks, and in recent years changes in DAS performance over time have been observed for DAS arrays that are buried in the ground. This dissertation investigates the effect that soil type, soil temperature, soil moisture, time in-situ, and vehicle loading have on DAS performance for fiber optic cables buried in soil. This was accomplished through a field testing program involving two newly installed DAS arrays. For the first installation, a new portion of DAS array was added to an existing DAS array installed a decade prior. The new portion of the DAS array was installed in four different soil types: native fill, sand, gravel, and an excavatable flowable fill. Soil moisture and temperature sensors were buried adjacent to the fiber optic cable to monitor seasonal environmental changes over time. Periodic impact testing was performed at set locations along the DAS array for over one year. A second, temporary DAS array was installed to test the effect of vehicle loading on DAS performance. Signal to Noise Ratio (SNR) of the DAS response was used for all the tests to evaluate the system performance. The results of the impact testing program indicated that the portions of the array in gravel performed more consistently over time. Changes in soil moisture or soil temperature did not appear to affect DAS performance. The results also indicated that time DAS performance does change somewhat over time. Performance variance increased in new portions of array in all material types through time. The SNR in portions of the DAS array in native silty sand material dropped slightly, while the SNR in portions of the array in sand fill and flowable fill material decreased significantly over time. This significant change in performance occurred while testing halted from March 2020 to August 2020 due to the Covid-19 pandemic. These significant changes in performance were observed in the new portion of test bed, while the performance of the prior installation remained consistent. It may be that, after some time in-situ, SNR in a DAS array will reach a steady state. Though it is unfortunate that testing was on pause while changes in DAS performance developed, the observed changes emphasize the potential of DAS to be used for infrastructure change-detection monitoring. In the temporary test bed, increasing vehicle loads were observed to increase DAS performance, although there was considerable variability in the measured SNR. The significant variation in DAS response is likely due to various industrial activities on-site and some disturbance to the array while on-boarding and off-boarding vehicles. The results of this experiment indicated that the presence of load on less than 10% of an array channel length may improve DAS performance. Overall, this dissertation provides guidance that can help inform the civil engineering community with respect to installation design recommendations related to DAS used for infrastructure monitoring.

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