234,270 research outputs found
Model Predictive Control for Speed Regulation of Autonomous Vehicles at Road Intersections and Performance Evaluation in a V2X Communication Scenario
No full textThe paper aims at evaluating the performance of a centralised control strategy, based on a scheduling procedure and MPC (model predictive control), that regulates the crossing of a four-way intersection by autonomous vehicles avoiding collisions in a V2X (vehicle-to-everything) communication scenario. In particular, we evaluate the performance considering different communication channel gain conditions, with packet loss process implemented through a Bernoullian probabilistic model based on the V2X communication protocol, as well as the impact of transmitting to the vehicles control aggregated commands of multiple future time horizons
Stabilizability of Markov jump linear systems modeling wireless networked control scenarios
No full textThe communication channels used to convey information between the components of wireless networked control systems (WNCSs) are subject to packet losses due to time-varying fading and interference. The WNCSs with missing packets can be modeled as Markov jump linear systems with one time-step delayed mode observations. While the problem of the optimal linear quadratic regulation for such systems has been already solved, we derive the necessary and sufficient conditions for stabilizability. We also show, with an example considering a communication channel model based on WirelessHART (a on-the-market wireless communication standard specifically designed for process automation), that such conditions are essential to the analysis of WNCSs where packet losses are modeled with Bernoulli random variables representing the expected value of the real random process governing the channel
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Lyman break galaxies and the star formation rate of the Universe at z ~ 6
No full textWe determine the space density of UV-luminous starburst galaxies at z≈ 6 using deep HST ACS SDSS-i′ (F775W) and SDSS-z′ (F850LP) and VLT ISAAC J and Ks band imaging of the Chandra Deep Field South. We find eight galaxies and one star with (i′−z′) > 1.5 to a depth of z′AB= 25.6 (an 8σ detection in each of the 3 available ACS epochs). This corresponds to an unobscured star formation rate of ≈15 h−270 M⊙ yr−1 at z= 5.9, equivalent to L* for the Lyman-break population at z= 3–4 (ΩΛ= 0.7, ΩM= 0.3). We are sensitive to star-forming galaxies at 5.6 ≲z≲ 7.0 with an effective comoving volume of ≈1.8 × 105h−370 Mpc3 after accounting for incompleteness at the higher redshifts due to luminosity bias. This volume should encompass the primeval subgalactic-scale fragments of the progenitors of about a thousand L* galaxies at the current epoch. We determine a volume-averaged global star formation rate of (6.7 ± 2.7) × 10−4h70 M⊙ yr−1 Mpc−3 at z∼ 6 from rest-frame UV selected starbursts at the bright end of the luminosity function: this is a lower limit because of dust obscuration and galaxies below our sensitivity limit. This measurement shows that at z∼ 6 the star formation density at the bright end is a factor of ∼6 times less than that determined by Steidel et al. for a comparable sample of UV-selected galaxies at z= 3–4, and so extends our knowledge of the star formation history of the Universe to earlier times than previous work and into the epoch where reionization may have occurred
Cultural identities as reflected in the literature of the Northern and Southern dynasties period (4th-6th centuries A.D.)
No full textDuring the period of the Northern and Southern dynasties of China identity questions became serious in a society thrown into disorder by political, religious and ethnic problems. This thesis uses three books written in the sixth century to
discuss how educated Chinese faced identity problems and how they dealt with them.
The Buddhist monk Huijiao, dealt with the problems of sinifying a foreign religion. He constructed many different identities in addition to the Buddhist one for the monks in his book Gaoseng zhuan, (Lives of Eminent Monks), a collection of biographies of Buddhist monks, to bring Buddhism closer to Chinese tradition and more acceptable by Confucian standards. Through the identity construction he
also made responses to anti-Buddhist ideas.
Yang Xuanzhi's Luoyang qielan ji, (Record of the Monasteries of Luoyang), deals with the identity problems of Chinese officials serving a Xianbei regime in
the north and of the short-lived capital of the Northern Wei in Luoyang. Yang reconstructed a Chinese identity for the lost capital as a true heir of Chinese tradition, as were the emperors, princes and officials who lived there. He created an identity defined not by ethnicity but by culture.
Yan Zhitui's Tanshi jiaxun, (Family Instruction of the Yan Clan), is a book which tells his descendants how to construct and maintain the future identity of his
own family. He drew on his own experience of recovering from repeated political catastrophes to set out an identity that would help the family to survive disordered times and maintain their status in society
Qing dai cai zheng shi lun gao
No full textGai shu ji lu le zuo zhe qi jin wei zhi fa biao de jing pin lun wen 13 pian, ji zhong dui Qing dai cai zheng wen ti jin xing le quan mian qing xi di tao lun, shi dui 20 shi ji wan Qing cai zheng shi yan jiu de ren zhen hui gu he zong jie. ben shu zai zong ti hui su de ji chu shang, chong dian lü shu ji ge zhong yao de zhuan ti yan jiu he tu chu cheng guo, bao kuo Qing dai yan zheng, tian fu, "qing yao bao fu"deng, zui hou tao lun wan qing cai zheng shi yan jiu de te dian yu bu z
Lund, Mrs. H. Z.
No full textPhotograph from the C.R. Savage Portrait Studio. Name associated with the photograph: Mrs. H. Z. Lun
Lund, Mrs. H. Z.
No full textPhotograph from the C.R. Savage Portrait Studio. Name associated with the photograph: Mrs. H. Z. Lun
Lund, Dr. H. Z.
No full textPhotograph from the C.R. Savage Portrait Studio. Name associated with the photograph: Dr. H. Z. Lun
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