A Simple Coded ARQ for Satellite Broadcasting

Gianluigi Liva,Christian Kissling,Christoph Hausl 한국통신학회 2010 Journal of communications and networks Vol.12 No.6

We introduce a novel packet retransmission technique which improves the efficiency of automatic retransmission query (ARQ) protocols in the context of satellite broadcast/multicast systems. The proposed coded ARQ technique, similarly to fountain coding, performs transmission of redundant packets, which are made by linear combinations of the packets composing the source block. Differently from fountain codes, the packets for the linear combinations are selected on the basis of the retransmission requests coming from the user terminals. The selection is performed in a way that, at the terminals, the source packets can be recovered iteratively by means of simple back-substitutions. This work aims at providing a simple and efficient alternative to reliable multicast protocols based on erasure correction coding techniques.

A Simple Coded ARQ for Satellite Broadcasting

Liva, Gianluigi,Kissling, Christian,Hausl, Christoph The Korea Institute of Information and Commucation 2010 Journal of communications and networks Vol.12 No.6

We introduce a novel packet retransmission technique which improves the efficiency of automatic retransmission query (ARQ) protocols in the context of satellite broadcast/multicast systems. The proposed coded ARQ technique, similarly to fountain coding, performs transmission of redundant packets, which are made by linear combinations of the packets composing the source block. Differently from fountain codes, the packets for the linear combinations are selected on the basis of the retransmission requests coming from the user terminals. The selection is performed in a way that, at the terminals, the source packets can be recovered iteratively by means of simple back-substitutions. This work aims at providing a simple and efficient alternative to reliable multicast protocols based on erasure correction coding techniques.

The very short frame of mobile DVB-RCS: Code design and QoS Performance

Liva, Gianluigi,Papaleo, Marco,Pá,rraga Niebla, Cristina,Cioni, Stefano,Scalise, Sandro,Vanelli-Coralli, Alessandro,Corazza, Giovanni E.,Kim, Pansoo,Lee, Ho-Jin John Wiley Sons, Ltd. 2010 International journal of satellite communications Vol.28 No.3

<P>In this paper, the design of a new very short frame introduced in the upcoming version of DVB-RCS standard targeting interactive mobile services will be described. The frame design with a special focus on channel coding and performance are addressed in detail, as well as an evaluation of the QoS performance for realistic traffic scenarios, propagation channel conditions, and carrier sizes. Copyright © 2009 John Wiley & Sons, Ltd.</P>

Low-complexity UWB-based collision avoidance system for automated guided vehicles

Stefania Monica,Gianluigi Ferrari 한국통신학회 2016 ICT Express Vol.2 No.2

This paper describes a low-complexity collision avoidance system for automated guided vehicles (AGVs) based on active ultra-wide band (UWB) modules. In particular, we consider an industrial warehouse where all the AGVs and target nodes (TNs) (e.g., people) are equipped with active UWB modules. A communication session between a pair of UWB modules permits the exchange of information and the estimation of the distance between them. The UWB module positioned on an AGV is connected to an on-board computer; whenever the UWB module on an AGV receives a message from a TN, it communicates all the received data to the on-board computer that can decide to stop the AGV if the range estimate is below a given threshold. This prevents undesired collisions between the AGV and the TN. In this paper, we present the experimental results of the proposed collision avoidance system obtained using the UWB modules, PulsON 410 ranging and communication modules (P410 RCMs), produced by Time Domain.

Iconic art infusion in luxury retail strategies: Unveiling the potential

Giovanni Pino,Gianluigi Guido,라잔나타라잔 한국마케팅과학회 2017 마케팅과학연구 Vol.27 No.2

This research investigates art infusion, a phenomenon in which artistic elements contribute to enhance the perceived value of consumer goods, in the retailing sector. An experiment conducted with 188 consumers suggests that individuals with high dispositional greed are more interested in shopping in luxury stores that promote products through artworks representative of an artist’s iconic, that is, most recognizable, style. Results show that greed determines consumers’ store preference through an externalized luxury tendency, that is a tendency to purchase luxury goods to show off social status. Such an eff ect proved to be stronger for extroverted than for introverted consumers.

Two-dimensional neovascular complexity is significantly higher in nontumor prostate tissue than in low-risk prostate cancer

Fabio Grizzi,Gianluigi Taverna,Piergiuseppe Colombo,Mauro Seveso,Guido Giusti,Silvia Proietti,Girolamo Fiorini,Giovanni Lughezzani,Paolo Casale,Nicolò Buffi,Massimo Lazzari,Giorgio Guazzoni 대한비뇨의학회 2015 Investigative and Clinical Urology Vol.56 No.6

Purpose: Prostate cancer is the most frequent cancer in men in Europe. A major focus in urology is the identification of new biomarkerswith improved accuracy in patients with low-risk prostate cancer. Here, we evaluated two-dimensional neovascular complexityin prostate tumor and nontumor biopsy cores by use of a computer-aided image analysis system and assessed the correlationsbetween the results and selected clinical and pathological parameters of prostate carcinoma. Materials and Methods: A total of 280 prostate biopsy sections from a homogeneous series of 70 patients with low-risk prostatecancer (Gleason score 3+3, prostate-specific antigen [PSA]<10 ng/mL, and clinical stage T1c) who underwent systematic biopsysampling and subsequent radical prostatectomy were analyzed. For each biopsy, 2-μm sections were treated with CD34 antibodiesand were digitized by using an image analysis system that automatically estimates the surface fractal dimension. Results: Our results showed that biopsy sections without cancer were significantly more vascularized than were tumors. No correlationswere found between the vascular surface fractal dimension and patient's age, PSA and free-to-total PSA ratios, pathologicalstage, Gleason score, tumor volume, vascular invasion, capsular penetration, surgical margins, and biochemical recurrence. Conclusions: The value of angiogenesis in prostate cancer is still controversial. Our findings suggest that low-risk prostate cancertissues are less vascularized than are nontumor tissues. Further studies are necessary to understand whether angiogenesis is a hallmarkof intermediate- and high-risk prostate cancer.

Role of emergency department observation units in the management of patients with unexplained syncope: a critical review and meta-analysis

Filippo Numeroso,Gianluigi Mossini,Giuseppe Lippi,Gianfranco Cervellin 대한응급의학회 2017 Clinical and Experimental Emergency Medicine Vol.4 No.4

This meta-analysis aimed to establish the role of standardized emergency department (ED) observation protocols in the management of syncopal patients as an alternative to ordinary admission. A systematic electronic literature search was performed to identify randomized controlled trials or observational studies evaluating syncopal patients managed in ED observation units. Data regarding mean length of stay, rate of etiological diagnosis, admission rate, and incidence of shortterm serious outcomes were extracted. Six mostly single-center, small sized studies characterized by high heterogeneity, were included. A total of 458 patients were included with a balanced sex distribution (male 50.2%), a mean age of 60.1 years, and a considerable prevalence of heart disease (32.4%). Pooled analysis of the outcomes showed a mean stay of 28.2 hours, an etiological diagnosis rate of 67.3%, an admission rate of 18.5%, and a very low incidence of short-term serious outcomes (2.8%). Due to elevated diagnostic yield and low incidence of short-term adverse events, ED observation units-based management strategy seems ideal for patients with syncope. Nevertheless, further research is needed to identify criteria for selecting patients to be managed with this approach, define evaluation protocols, and confirm the safety of this strategy

Maximum likelihood localization: When does it fail?

Stefania Monicaa,Gianluigi Ferrari 한국통신학회 2016 ICT Express Vol.2 No.1

Maximum likelihood is a criterion often used to derive localization algorithms. In particular, in this paper we focus on a distance-based algorithm for the localization of nodes in static wireless networks. Assuming that Ultra Wide Band (UWB) signals are used for inter-node communications, we investigate the ill-conditioning of the Two-Stage Maximum-Likelihood (TSML) Time of Arrival (ToA) localization algorithm as the Anchor Nodes (ANs) positions change. We analytically derive novel lower and upper bounds for the localization error and we evaluate them in some localization scenarios as functions of the ANs’ positions. We show that particular ANs’ configurations intrinsically lead to ill-conditioning of the localization problem, making the TSML-ToA inapplicable. For comparison purposes, we also show, through some examples, that a Particle Swarm Optimization (PSO)-based algorithm guarantees accurate positioning also when the localization problem embedded in the TSML-ToA algorithm is ill-conditioned.

SHINING A LIGHT ON THE DARK SIDE OF BUSINESS: THE RESISTIBLE GROWTH OF CRIMINAL FIRMS IN THE PUBLIC SECTOR

PAOLO CANONICO,STEFANO CONSIGLIO,ERNESTO DE NITO,GIANLUIGI MANGIA 한국행정학회 2012 International Review of Public Administration Vol.17 No.1

In this paper, we analyze the mechanisms adopted by criminal firms in order to thrive in the business of public works. We submit that resource dependency theory (RDT) can shed light on this area. We find that criminal firms use a variety of techniques to alter the behavior of actors in procurement processes. We claim that the best way to analyze this phenomenon is by integrating the traditional RDT strategies codified in Pfeffer and Salancik (1978) with an understanding of these criminal techniques. We adopt a qualitative research methodology, relying on official judiciary sources in order to develop and validate the concept’s objects of analysis. Our work has been supported by leading Italian magistrates actively engaged in combating the penetration of criminal firms into legal businesses.

Integration of Wi-Fi mobile nodes in a Web of Things Testbed

Luca Davoli,Laura Belli,Antonio Cilfone,Gianluigi Ferrari 한국통신학회 2016 ICT Express Vol.2 No.3

The Internet of Things (IoT) is supposed to connect billions of devices to the Internet through IP-based communications. The main goal is to foster a rapid deployment of Web-enabled everyday objects, allowing end users to manage and control smart things in a simple way, by using Web browsers. This paper focuses on the integration of Wi-Fi nodes, hosting HTTP resources, into a Web of Things Testbed (WoTT). The main novelty of the proposed approach is that the WoTT integrates new nodes by using only standard mechanisms, allowing end-users to interact with all Smart Objects without worrying about protocol-specific details.