An Introduction to the School of Information Science and Technology of BIT

The School of Information Science and Technology inBeijing Institute of Technology(BIT)was established July 2002by merging the former Department of Computer Science andEngineering, Department of Automatic Control,Department ofOptical Engineering and Department of Electronic Engineering.As a significant organizational reform in the university to fit inwith developments in higher education as well as in science andtechnology;the organizational reform was taken in order to

Quantitative information measurement and application for machine component classification codes

Information embodied in machine component classification codes has internal relation with the probability distribu- tion of the code symbol. This paper presents a model considering codes as information source based on Shannon’s information theory. Using information entropy, it preserves the mathematical form and quantitatively measures the information amount of a symbol and a bit in the machine component classification coding system. It also gets the maximum value of information amount and the corresponding coding scheme when the category of symbols is fixed. Samples are given to show how to evaluate the information amount of component codes and how to optimize a coding system.

Position Optimization for Mobile Relay Communications with Constrained Energy over a Whole Horizontal Plane

This paper concerns the position optimization problem of a mobile relay over a whole horizontal plane.This problem is important because the position of a mobile relay directly affects the end-to-end performance,e.g.,reliability,connectivity,and data rate.In this paper,we propose a new position optimization scheme of a mobile relay over a whole horizontal plane based on the one-bit feedback information from the destination node,which improves the performance over the prior scheme whose position of the mobile relay is optimized over a fixed orbit.In the proposed scheme,the mobile relay is equipped with merely one single onboard antenna.Moreover,no prior information about the positions of both the source node and the destination node is required.Thus,the proposed scheme can work at low network resources scenario,which is particularly suitable for mobile relay communication with constrained energy,e.g.,the communications in a disaster area where the infrastructure is heavily damaged,volcano monitoring,and wireless powered communication networking.According to the characteristics of the proposed scheme,we further design two heuristic implementations to calculate the optimal position of a mobile relay over a whole horizontal plane.The first implementation has better steady performance whereas the second implementation has better convergence speed.We implement the proposed scheme and conduct an extensive performance comparison between the proposed scheme and prior schemes to verify the advantages of the proposed scheme.

Reconfigurable Metasurface:A Systematic Categorization and Recent Advances

Considering the rapid progress of theory,design,fabrication and applications,metasurfaces(MTSs)have become a new research frontier in microwave,terahertz and optical bands.Reconfigurable metasurfaces(R-MTSs)can dynamically modulate electromagnetic(EM)waves with unparalleled flexibility,which has led to a great surge of research in recent years.Numerous R-MTSs with powerful capabilities and various functions are being proposed explosively.Based on the five dimensions of EM waves,this review proposes a unified model to describe the interactions among R-MTSs,EM waves and EM information and suggests an information bit allocation strategy to categorize different types of R-MTSs systematically.Recent advances in R-MTSs and 1-bit and 2-bit elements manipulating different wave dimensions are reviewed in detail.Finally,this review discusses the future research trends of R-MTSs.R-MTSs with diverse dimensions and functions may propel the next generation of communication,detection,sensing,imaging and computing applications.

信息主义和唯信息主义

随着人类社会的信息化、智能化的加速发展,“信息主义”或说“信息范式”崛起的科学性和合理性是毋庸置疑的。从哲学存在论的层次确立信息的独立地位,承认客观信息,并将其看作与物质和精神不同的全新世界,必然会引起人类哲学的全新革命。如果把信息看作世界的本原,并认定物质和精神现象都是从信息世界中派生和幻化出来的,那么,这样的信息主义便一定会滑向唯信息主义。正如惠勒所主张的“万物源于比特”“万物皆为信息”的观点那样。受唯信息主义学说的影响,某些中国学者也开始用唯信息主义的观点对中国古代哲学中的“太极”和“道”的学说,以及佛学中的相关理念进行重新阐释和解读。其中的某些观点虽然十分新奇,并惊世骇俗,但是,却缺乏应有的科学性和合理性。