86,789 research outputs found
Innovative Rotman lens setup for extended scan range array antennas
No full textThe aim of this work is to design a smart and cost effective 24 GHz Short Range Radar (SRR) array antenna system for automotive applications. The beam forming network consists of a hybrid solution including an analog phase shifter, realized with a Rotman lens, and an additional digital phase shifting stage on array side allowing to select between two states, and consequently to enhance the scan angle. This paper will demonstrate that this new concept allows to double the scanning capability of the array with respect to a design employing only the Rotman lens
Miniaturized and Reconfigurable Rat-Race Coupler Based on Artificial Transmission Lines
No full textA miniaturized and reconfigurable rat-race coupler realized in inexpensive PCB technology is proposed. Miniaturization is achieved by exploiting the theory of right- and left-handed artificial transmission lines. The frequency agility allows the rat-race coupler to operate at two bands centered at 900 MHz and 1.7 GHz, therefore covering many industrial and communication standards. The frequency selection is operated by CMOS switches, controlled by only 1-bit signal, for adapting the equivalent electrical length of the four branches of the coupler. Moreover, the dimension is significantly reduced with respect to standard realizations at the same frequencies, with required areas of about 3% at 900 MHz and 10.4% at 1.7 GHz. The proposed design has been fabricated and measured, showing good performance in both operative frequency bands
Towards a governance of technology transfer: fostering impact through goals, people, and resources
No full textThis study investigates the governance mechanisms that universities and Public Research Organizations (PROs) can implement to foster the impact of technology transfer initiatives. While maximizing the technology transfer impact has been widely explored both in research and practice, our understanding of the role that governance can play in this process remains limited. This paper addresses this gap by identifying specific governance mechanisms that universities and PROs can implement to achieve greater impact in their technology transfer initiatives. We performed a qualitative analysis of technology transfer professionals in the Italian context. We relied on interviews and secondary sources accessed through Netval, the National Association for Technology Transfer. Our findings reveal three critical governance levels: (i) the political level, which leverages goals as key elements, (ii) the relational level, which leverages people, and (iii) the technological level, which leverages resources. Drawing on goal setting, stakeholder, and resource dependence theories, we create a governance framework to maximize technology transfer impact. This study contributes to the governance literature by integrating and extending these three theories in the technology transfer domain, illustrating their interplay across political, relational, and technological governance levels. For each, we present a series of formal and informal governance mechanisms that universities and PROs should adopt to strengthen the societal and economic impact of their technology transfer initiatives
Compact Extended Scan Range Antenna Array based on Rotman Lens
No full textThis article proposes an innovative method for extending the scan range of phased arrays based on Rotman lens by a factor two. The main objective is to take advantage of the performance of the Rotman lens as beamforming network, resolving its intrinsic increase of phase error and coupling losses when wide scan angles are required. The proposed concept aims to overcome these limitations by introducing the combination of two specific operations called “complete beam shifting (CBS)” and “beam mirroring (BM).” The described technique is applied to a 24 GHz scanning array antenna system, designed and manufactured by taking into consideration fabrication and related cost issues. Finally, the proposed concept has been validated through measurements
Phase management for extended scan range antenna arrays based on Rotman lens
No full textThis paper presents an implementation of a technique aimed to double the scanning range of a 24 GHz array antenna system
based on Rotman lens beamforming. The new concept of the enhanced beam forming network consists of a combination of Rotman lens and
1-bit phase shifters, positioned in a peculiar way on the array side of the lens, and together with a particular beam arrangement allows to
overcome the scan limitations which is typical of the standalone Rotman lens solution. Simulations will demonstrate that a Rotman
lens, designed to steer the beam up to ±30°, when arranged in combination with properly designed Ratrace based phase shifters, allows to increase the scan range up to ±60°
Ownership vs stewardship: toward a practice-based model of value capture in open innovation
No full textVariations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
[Newspaper Clipping: Author Claims Evidence of Second JFK Assassin #1]
No full textNewspaper article titled "Author Claims Evidence of Second JFK Assassin." The article states that author Richard J. Whalen concluded "that there is circumstantial evidence to support the theory of a second assassin in the shooting of President John F. Kennedy.
Also By The Same Author: AKTiveAuthor, a Citation Graph Approach to Name Disambiguation
No full textThe desire for definitive data and the semantic web drive for inference over heterogeneous data sources requires co-reference resolution to be performed on those data. In particular, name disambiguation is required to allow accurate publication lists, citation counts and impact measures to be determined. This paper describes a graph-based approach to author disambiguation on large-scale citation networks. Using self-citation, co-authorship and document source analyses, AKTiveAuthor clusters papers, achieving precision of 0.997 and recall of 0.818 over a test group of eight surname clusters
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