String Stability towards Leader thanks to Asymmetric Bidirectional Controller

This paper deals with the problem of string stability of interconnected systems with double-integrator open loop dynamics (e.g.~acceleration-controlled vehicles). We analyze an asymmetric bidirectional linear controller, where each vehicle is coupled solely to its immediate predecessor and to its immediate follower with different gains in these two directions. We show that in this setting, unlike with unidirectional or symmetric bidirectional controllers, string stability can be recovered when disturbances act only on a small ($N$-independent) set of leading vehicles. This improves existing results from the literature with this assumption. We also indicate that string stability with respect to arbitrarily distributed disturbances cannot be achieved with this controller.Comment: Version 2 corrects a typo in the proof, and adds the proof of stability before string stability. Slightly longer than published versio

Ordinary

In lieu of an abstract, below is the essay\u27s first paragraph. The water felt warm against her aching body. As she drew in a breath of jasmine and wildflowers, she laid her head back in the white bubbles that rested on the old ceramic of her bathtub. But the bubbles weren\u27t really white, she thought to herself, as she lifted a handful up to her face. They were really more like many multicolored transparent spheres that were so very delicate and full of beautiful fragrance. There were hues of pink and lavender and subtle hints of gold that would show when she turned her hand to the light, and this made her smile, because it was ordinary. The perfect spheres of color that disappeared as quickly as they formed, had made her long for ordinary times. And she almost wished she could become one of these bubbles, to float and glisten with color and then disappear with a hint of beauty. If only it could be that ordinary again

Parallel Integer Polynomial Multiplication

We propose a new algorithm for multiplying dense polynomials with integer coefficients in a parallel fashion, targeting multi-core processor architectures. Complexity estimates and experimental comparisons demonstrate the advantages of this new approach

Coping With Stress in Iranian School-Age Children

Background: Methods learnt by children to cope with stress will be used in their adolescence. Failure to learn adaptive coping strategies causes some mental, physical and behavioral problems which continue until adulthood. Objectives: The current study was conducted to investigate the methods of coping with stress among Iranian school-age children. Patients and Methods: A descriptive study was conducted in which a randomly selected sample of 839 students of third to fifth grade of primary school in Tabriz, Iran participated. The data were collected using the Schoolagers` Coping Strategies Inventory questionnaire. SPSS software was employed to analyze the data by percentage, absolute frequency, and linear regression test. Results: All coping methods inserted in the questionnaire were used by students. More than 70% of students mentioned “pray”, “say I’m sorry or tell the truth”, and “try to relax, stay calm” out of 26 cases of coping strategies. According to more than 60% of children, “pray”, “say I’m sorry or tell the truth”, and “draw, write, or read something” were the most useful coping methods and “pick on someone” and “yell or scream” were not mostly used by the children under study. Conclusions: Children use variable methods to cope with their stress. Therefore, parents, health trainers and school authorities should distinguish non-adaptive methods of children and teach them the adaptive coping strategies

Mobile phone social harms (mobile phone, communicative device or crime tool)

One of the human inventions created in order to facilitate life but it became scourge for him is mobile phone. Ignorance on quality of using mobile phone and conscious use of it in inappropriate way will have consequences that it seems that it gradually becomes as social problem and harm. Author of this paper aims to warns against risks and harmful and abnormal consequences of it since he believes that mobile will be a factor for crime as several crimes are occurring currently through this communicative tool that some of them will be discussed in this paper. Then, author has provided some recommendations at the end of paper in two sections related to government (three branches) and people (users). This study is a review paper in which data were collected by using library method and author has used of relevant papers, books, and reports.Keywords: mobile; social harm; crime; factors causing crime, other invention