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Start Over Author "B.G." Journal electronics letters
267 results on '"B.G."'

1. Image enhancement in forward imaging radar using modified apodisation technique

Author

Sun-Gu Sun, B.G. Lim, and Byung-Lae Cho

Subjects
business.industry, Computer science, Aperture, Image quality, Side looking airborne radar, law.invention, Continuous-wave radar, Inverse synthetic aperture radar, Optics, law, Radar imaging, Computer vision, Artificial intelligence, Electrical and Electronic Engineering, Radar, business
Abstract

Forward imaging radar using an UWB signal has been developed by many researchers. The image quality in this radar is not satisfactory because of the limitation of aperture length. Proposed is an image enhancement method using a modified apodisation technique in forward imaging radar. An experiment is carried out to validate the proposed method. The azimuth resolution and peak-to-sidelobe ratio are improved by the proposed method by up to about 11.7% and 10 dB, respectively.

Published
2013

23. All-optical NAND gate using cross-gain modulation in semiconductor optical amplifiers

Author

S.H. Kim, J.H. Kim, B.G. Yu, Y.T. Byun, Y.M. Jeon, S. Lee, and D.H. Woo

Subjects
Physics, Optical amplifier, Extinction ratio, business.industry, Clock signal, Electrical engineering, NAND gate, Signal, Modulation, Logic gate, Optoelectronics, Electrical and Electronic Engineering, business, Gate equivalent
Abstract

By using gain nonlinearity characteristics of a semiconductor optical amplifier, an all-optical NAND gate at 10 Gbit/s is demonstrated. The all-optical NAND gate operates in single mechanism, which is cross-gain modulation. In the NAND gate (AB+Ā), Boolean AB is obtained by using signal A as a probe beam and signal B as a pump beam in SOA-1. Also, Boolean Ā is obtained by using the clock signal as a probe beam and signal A as a pump beam in SOA-2. By adding the two outputs from SOA-1 and SOA-2, Boolean Ā+AB (logic NAND) can be acquired. The extinction ratio is about 6.1 dB.

Published
2005

29. Higher-order predistortion linearisation using cascaded lower-order nonlinearities

Author

Robert E. Myers, Thomas M. Antonsen, B.G. Danly, Baruch Levush, J.X. Qiu, and David K. Abe

Subjects
Nonlinear system, Control theory, Linearization, law, Amplifier, Electronic engineering, Order (ring theory), Lower order, Electrical and Electronic Engineering, Traveling-wave tube, Predistortion, Mathematics, law.invention
Abstract

A technique for realising nonlinear functions of order ≥5 using cascaded third-order nonlinear functions is described. The technique can be used to efficiently generate higher-order nonlinearities for predistortion linearisation applications. The use of two cascaded third-order functions is experimentally demonstrated to be comparable to a fifth-order implementation in performance.

Published
2004

31. Practical technique for measurement of second-order nonlinearity in poled glass

Author

Peter G. Kazansky, B.G. Klappauf, Costantino Corbari, and Olivier Deparis

Subjects
Nonlinear optical, Nonlinear system, Materials science, Optics, business.industry, Resolution (electron density), Electrical and Electronic Engineering, business, Layer (electronics)
Abstract

A simple and nondestructive technique for measuring the thickness of the nonlinear optical layer in thermally poled glass, providing a minimum measurable thickness of 4 and 1µm resolution, is demonstrated. This technique is generally applicable to other nonlinear optical layers as well.

Published
2003

37. Design of new ABR congestion control algorithm using probabilistic congestion detection in ATM networks

Author

B.G. Kim, Eun Bong Lee, and Jae Yong Lee

Subjects
Flow control (data), business.industry, Computer science, Available bit rate, Real-time computing, Probabilistic logic, TCP congestion-avoidance algorithm, Network congestion, Congestion detection, Asynchronous Transfer Mode, Electrical and Electronic Engineering, business, Queue, Congestion control algorithm, Computer network
Abstract

A new available bit rate (ABR) congestion control algorithm is proposed which, by adopting a probabilistic congestion detection (PCD) scheme in ATM networks, improves the performance of the ABR algorithms which use queue length as a congestion indicator. Since the PCD scheme prevents ABR sources from being synchronised, it reduces queue length fluctuation and cell losses in ATM switches. Also, the PCD scheme is less sensitive to a change of the ABR control parameters.

Published
2000

46. Efficient modelling of finite-size ungrounded PCBs with a full wave 3D moment-method analysis

Author

A. McCowen and B.G. Salman

Subjects
Moment (mathematics), Engineering, Printed circuit board, Full wave, business.industry, Electronic engineering, Electrical engineering, Dielectric substrate, Central processing unit, Electromagnetic model, Electrical and Electronic Engineering, business, Order of magnitude
Abstract

A method in which 2D sheet-impedance elements are used to represent the finite-size dielectric substrate of an ungrounded PCB within a full wave 3D moment-method analysis (MoM) is presented. The use of these 2D elements significantly reduces both the core-memory demands and the CPU requirements of the MoM by an order of magnitude, with little compromise in accuracy.

Published
1999

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