通用突变控制方法及其在潜艇中的应用

运用非线性动力学和突变理论,研究了高维系统建立具有理想特性突变的控制方法.引入冲失滤波器保证系统平衡点不变,并利用隐式判据、中心流形定理以及规范形法确定控制增益.以潜艇空间运动为例,阐述计算的全过程.该控制方法简便、快捷,可广泛应用到实际控制系统的设计中.     

Physically Guided Animation of Trees

This paper presents a new method to animate the interaction of a tree with wind both realistically and in real time. The main idea is to combine statistical observations with physical properties in two major parts of tree animation. First, the interaction of a single branch with the forces applied to it is approximated by a novel efficient two step nonlinear deformation method, allowing arbitrary continuous deformations and circumventing the need to segment a branch to model its deformation behavior. Second, the interaction of wind with the dynamic system representing a tree is statistically modeled. By precomputing the response function of branches to turbulent wind in frequency space, the motion of a branch can be synthesized efficiently by sampling a 2D motion texture.
Using a hierarchical form of vertex displacement, both methods can be combined in a single vertex shader, fully leveraging the power of modern GPUs to realistically animate thousands of branches and ten thousands of leaves at practically no cost.     

Fruit Senescence and Decay Simulation

Aging and imperfections provide important visual cues for realism. We present a novel physically‐based approach for simulating the biological aging and decay process in fruits. This method simulates interactions between multiple processes. Our biologically‐derived, reaction‐diffusion model generates growth patterns for areas of fungal and bacterial infection. Fungal colony spread and propagation is affected by both bacterial growth and nutrient depletion. This process changes the physical properties of the surface of the fruit as well as its internal volume substrate. The fruit is physically simulated with parameters such as skin thickness and porosity, water content, flesh rigidity, ambient temperature, humidity, and proximity to other surfaces. Our model produces a simulation that closely mirrors the progression of decay in real fruits under similar parameterized conditions. Additionally, we provide a tool that allows artists to customize the input of the program to produce generalized fruit simulations.     

水雷出水模型突变的控制方法

水雷水下发射攻击水上目标时出水瞬间数学模型发生突变, 严重影响水雷出 水的稳定性和打击概率, 对这一过程设计了滑模变结构单控制器和组合控制 器.利用微分几何的输入输出反馈线性化方法将非线性系统进行了线性化, 并利用变结构控制策略及趋近律算法设计了姿态跟踪闭环控制系统, 计算简便, 易于实现.对两种控制器的优劣性进行了比较, 通过数字仿真表明所设 计的控制系统可以适用于水下攻击目标出水突变过程, 并对系统参数摄动具 有较强的鲁棒性.     

一类工业加热炉温度混沌系统的模糊控制

炉温系统因其复杂性存在混沌现象，因此是难于控制的对象。混沌现象的主要特征之一是初始条件稍有不同，随着时间的变化其行为差异极大。但混沌并不等同于无序，表现为整体稳定，但局部是不稳定的，因此从全局考虑呈现出混沌与有序并存。文中采用模糊控制技术克服了用传统PID难于控制的炉温混沌现象的困难，系统的仿真与实际运行效果表明，模糊控制是克服混沌现象的一种有效方法。     

基于脆性势函数对复杂系统的脆性分析

本文主要是针对于存在于复杂系统中的脆性问题进行分析，给出了有关脆性问题方面的有关定义，在进行分析的过程中，我们采用的是突变理论的势函数来进行复杂系统的脆性分析的，此种方法是本文首次提出的，具有新颖性与创新性。     

An empirical examination of factors associated with Game Transfer Phenomena severity

Game Transfer Phenomena (GTP) (i.e. altered perceptions, spontaneous thoughts and behaviors with game content) occur on a continuum from mild to severe. This study examined the differences between mild, moderate and severe levels of GTP. A total of 2281 gamers’ participated in an online survey. The majority of gamers experienced a mild level of GTP. The factors significantly associated with the severe level of GTP were: (i) being students, (ii) being aged 18 to 22 years, (iii) being professional gamers, (iv) playing videogames every day in sessions of 6 h or more, (iv) playing to escape from the real world, (v) having a sleep disorder, mental disorder or reported dysfunctional gaming, and (vi) having experienced distress or dysfunction due to GTP. In addition, having used drugs and experiencing flashbacks as side-effects of drug use were significantly less likely to be reported by those with mild level of GTP. In a regression analysis, predictors of severe GTP included positive appraisals of GTP, distress or dysfunction due to GTP, and tendency to recall dreams. In general, the findings suggest that those with severe level of GTP share characteristics with profiles of gamers with dysfunctional gaming (e.g., problematic and/or addictive gaming).     

A case study in the meta-reasoning procedure ND

A new technique for improving the efficiency of propositional reasoning procedures is presented. The meta-search procedure, ND, is parameterized by a search procedure P and a real number for controlling the way in which P is applied to the given problem. Experiments using SATO on the domain of Crossword Puzzle Construction (CPC) illustrate the potential for ND. Variations of and future experiments with ND are discussed.     

Empirical study on Game Transfer Phenomena in a location-based augmented reality game

Research on Game Transfer Phenomena (GTP) has demonstrated that playing video games can lead to re-experiencing images, sounds, tactile sensations, spontaneous thoughts and actions, sometimes triggered by physical objects/events associated with the game. Location-based augmented reality games posit interesting questions regarding GTP, particularly because they use physical locations, they overlay digital images in physical contexts and the gameplay shifts between the virtual and the physical world. This study aims to investigate the prevalence of GTP and the role of immersion, augmented reality and sound in a sample of English- (EnS) and Spanish- (SpS) speaking gamers of the game Pokémon Go (PoGo). A total of 1313 gamers (M_age?=?31.47) were recruited online. GTP was less common than in previous studies; however, 82.4% had experienced GTP at least once. The SpS showed higher prevalence of GTP and played more intensively. Automatic mental processes predominated in the EnS, while behaviours and actions were more common in the SpS. The absence or presence of video game features seems important for the way GTP manifests. For instance, tactile hallucinations were more prevalent, while sensations of self-motion were less reported. Playing with augmented reality (AR) and sounds showed significant correlations with various GTP types, but not with re-experiencing images from the game. More gamers who reported the sensation that Pokémon were physically present or looked for Pokémon outside the screen while playing, as connotations of immersion, had experienced GTP. Experiencing GTP while playing may be more common in location-based augmented reality games, compared to other games.     

A process synthesis-intensification framework for the development of sustainable membrane-based operations

In this paper a multi-level, multi-scale framework for process synthesis-intensification that aims to make the process more sustainable than a base-case, which may represent a new process or an existing process, is presented. At the first level (operation-scale) a conceptual base case design is synthesized through the sequencing of unit operations and subsequently analyzed for identifying process hot-spots using economic, life cycle and sustainability metrics. These hot-spots are limitations/bottlenecks associated with tasks that may be targeted for overall process improvement. At the second level (task-scale) a task-based synthesis method is applied where one or more tasks representing unit operations are identified and analyzed in terms of means-ends for generating intensified flowsheet alternatives. At the third level (phenomena-scale) a phenomena-based synthesis method is applied, where the involved phenomena in various tasks are identified, manipulated and recombined to generate new and/or existing unit operations configured into flowsheet alternatives that target the tasks associated with hot-spots. Every lower-scale or higher-level, generates more alternatives than their corresponding larger-scale. Those alternatives that are able to address the identified hot-spots therefore give innovative and more sustainable process designs that otherwise could not be found from the larger-scales. In this paper, membrane-based operations identified through this framework are highlighted in terms of extension of the combined intensification-synthesis method and its application to generate membrane-based operations. Also, application of the framework is illustrated through a case study involving the production of methyl acetate where membrane-based intensified operations play a major role in determining more sustainable process design alternatives.