Ergodicity for the GI/G/1GI/G/1-type Markov Chain

Ergodicity is a fundamental issue for a stochastic process. In this paper, we refine results on ergodicity for a general type of Markov chain to a specific type or the $GI/G/1$-type Markov chain, which has many interesting and important applications in various areas. It is of interest to obtain conditions in terms of system parameters or the given information about the process, under which the chain has various ergodic properties. Specifically, we provide necessary and sufficient conditions for geometric, strong and polynomial ergodicity, respectively.Comment: 16 page

Probabilistic Forecasting of Photovoltaic Generation: An Efficient Statistical Approach

A novel efficient probabilistic forecasting approach is proposed to accurately quantify the variability and uncertainty of the power production from photovoltaic (PV) systems. Distinguished from most existing models, a linear programming based prediction interval construction model for PV power generation is constructed based on extreme learning machine and quantile regression, featuring high reliability and computational efficiency. The proposed approach is validated through the numerical studies on PV data from Denmark.Department of Electrical Engineerin

«Один пояс, один путь» в системе глобального управления: парадоксы перестройки инициативы

Involvement in the project of foreign experts on the "One Belt, One Road" initiative of the Renmin University of China has provided an opportunity to comprehend how and for what purpose information is formed on the initiative of Chinese President Xi Jinping, as well as the role of the mass media in the formation of a positive image of the proposed initiative. The study deals with the information component of the initiative of the People's Republic of China in the framework of the vector focused on the Russian Federation. More than five years have passed since Chinese President Xi Jinping announced in Astana, Kazakhstan a new Chinese initiative called "One Belt, One Road". From the reports of various Chinese agencies, it follows that the initiative of the People's Republic of China is quite successfully implemented in all areas. The forums held in Beijing in 2018 and 2019 showed that the main emphasis was made on the image component of the "One Belt, One Road" concept, which was a demonstration of the increased role of China as an independent center of power. According to some Chinese scientists, China no longer denies its desire to become a leader in the current world order. Moreover, while until recently China has been limited to economic domination, today its influence extends into the (geo) political sphere.La participación en el proyecto de expertos extranjeros en la iniciativa "One Belt, One Road" de la Universidad Renmin de China ha brindado la oportunidad de comprender cómo y para qué propósito se forma la información por iniciativa del presidente chino Xi Jinping, así como papel de los medios de comunicación en la formación de una imagen positiva de la iniciativa propuesta. El estudio aborda el componente de información de la iniciativa de la República Popular de China en el marco del vector centrado en la Federación de Rusia. Han pasado más de cinco años desde que el presidente chino, Xi Jinping, anunció en Astana, Kazajstán, una nueva iniciativa china llamada "One Belt, One Road". De los informes de varias agencias chinas, se deduce que la iniciativa de la República Popular de China se implementa con bastante éxito en todas las áreas. Los foros celebrados en Beijing en 2018 y 2019 mostraron que el énfasis principal se hizo en el componente de imagen del concepto "One Belt, One Road", que era una demostración del mayor papel de China como un centro de poder independiente. Según algunos científicos chinos, China ya no niega su deseo de convertirse en un líder en el orden mundial actual. Además, aunque hasta hace poco China se había limitado a la dominación económica, hoy su influencia se extiende a la esfera (geo) políticaРабота в проекте иностранных экспертов инициативы «Один пояс, один путь» Renmin University of Chinа предоставила возможность понять, как и с какой целью формируется информация по инициативе Председателя КНР Си Цзиньпина, роль СМИ в формировании позитивного имиджа инициативы. Исследование посвящено информационной составляющей инициативы Китайской Народной республики по вектору, направленному в сторону Российской Федерации. Прошло более пяти лет, как председатель КНР Си Цзиньпин, в Казахстанской Астане, огласил новую китайскую инициативу, получившую название «Один пояс, один путь». Из отчетов различных китайских ведомств, следует что инициатива Китайской Народной республики достаточно успешно реализуется на всех ее направлениях. Проведенные Форумы в Пекине в 2018 и 2019 годах показали, что основной упор делался на имиджевую составляющую концепции «Один пояс, один путь» - демонстрацию возросшей роли Китая как самостоятельного «Центра силы». По мнению некоторых китайских ученых, Китай уже не отрицает своего стремления стать лидером в нынешнем мировом порядке. Причем, если до последнего времени Китай ограничивался экономическим господством, то сегодня его влияние перетекает и в (гео)политическую сферу

単結晶SiCの放電加工システムの開発

学位の種別: 課程博士審査委員会委員 : (主査)東京大学教授 国枝 正典, 東京大学教授 横井 秀俊, 東京大学教授 金 範埈, 東京大学准教授 山本 晃生, 名古屋工業大学准教授 早川 伸哉University of Tokyo(東京大学

Migration resistance of esophageal stents: The role of stent design

Objective: Stenting is one of the major treatments for malignant esophageal cancer. However, stent migration compromises clinical outcomes. A flared end design of the stent diminishes its migration. The goal of this work is to quantitatively characterize stent migration to develop new strategies for better clinical outcomes. Methods: An esophageal stent with flared ends and a straight counterpart were virtually deployed in an esophagus with asymmetric stricture using the finite element method. The resulted esophagus shape, wall stress, and migration resistance force of the stent were quantified and compared. Results: The lumen gain for both the flared stent and the straight one exhibited no significant difference. The flared stent induced a significantly larger contact force and thus a larger stress onto the esophagus wall. In addition, more migration resistance force was required to pull the flared stent through the esophagus. This force was inversely related to the occurrence rate of stent migration. A doubled strut diameter also increased the migration resistance force by approximately 56%. An increased friction coefficient from 0.1 to 0.3 also boosted the migration resistance force by approximately 39%. Summary: The mechanical advantage of the flared stent was unveiled by the significantly increased contact force, which provided the anchoring effect to resist stent migration. Both the strut diameter and friction coefficient positively correlated with the migration resistance force, and thus the occurrence of stent migration

Migration resistance of esophageal stents: The role of stent design

Objective: Stenting is one of the major treatments for malignant esophageal cancer. However, stent migration compromises clinical outcomes. A flared end design of the stent diminishes its migration. The goal of this work is to quantitatively characterize stent migration to develop new strategies for better clinical outcomes. Methods: An esophageal stent with flared ends and a straight counterpart were virtually deployed in an esophagus with asymmetric stricture using the finite element method. The resulted esophagus shape, wall stress, and migration resistance force of the stent were quantified and compared. Results: The lumen gain for both the flared stent and the straight one exhibited no significant difference. The flared stent induced a significantly larger contact force and thus a larger stress onto the esophagus wall. In addition, more migration resistance force was required to pull the flared stent through the esophagus. This force was inversely related to the occurrence rate of stent migration. A doubled strut diameter also increased the migration resistance force by approximately 56%. An increased friction coefficient from 0.1 to 0.3 also boosted the migration resistance force by approximately 39%. Summary: The mechanical advantage of the flared stent was unveiled by the significantly increased contact force, which provided the anchoring effect to resist stent migration. Both the strut diameter and friction coefficient positively correlated with the migration resistance force, and thus the occurrence of stent migration

Amplification and adaptation of centromeric repeats in polyploid switchgrass species.

Centromeres in most higher eukaryotes are composed of long arrays of satellite repeats from a single satellite repeat family. Why centromeres are dominated by a single satellite repeat and how the satellite repeats originate and evolve are among the most intriguing and long-standing questions in centromere biology. We identified eight satellite repeats in the centromeres of tetraploid switchgrass (Panicum virgatum). Seven repeats showed characteristics associated with classical centromeric repeats with monomeric lengths ranging from 166 to 187 bp. Interestingly, these repeats share an 80-bp DNA motif. We demonstrate that this 80-bp motif may dictate translational and rotational phasing of the centromeric repeats with the cenH3 nucleosomes. The sequence of the last centromeric repeat, Pv156, is identical to the 5S ribosomal RNA genes. We demonstrate that a 5S ribosomal RNA gene array was recruited to be the functional centromere for one of the switchgrass chromosomes. Our findings reveal that certain types of satellite repeats, which are associated with unique sequence features and are composed of monomers in mono-nucleosomal length, are favorable for centromeres. Centromeric repeats may undergo dynamic amplification and adaptation before the centromeres in the same species become dominated by the best adapted satellite repeat