Search results for "DDE"

Moving RTS/CTS to the frequency domain: an efficient contention scheme for 802.11ax networks

2019

In this paper, we propose a contention mechanism based on the execution of multiple contention rounds in the frequency domain (ReCHo), which is designed to offer high throughput performance and robustness with respect to imperfect carrier sensing. The main idea is using narrow tones as signalling messages for performing channel access contentions and allowing the Access Point (AP) to echo these signals, in order to extend the sensing capabilities to all the stations associated to the AP. In particular, we refer to the emerging IEEE 802.11ax standard, showing how our scheme can boost performance of random access with respect to the current version of IEEE 802.11ax OFDMA Back-Off (OBO), even …

The dynamics of Italian competitive positioning in the Mediterranean Bluefin tuna industry

2020

The bluefin tuna or Thunnus thynnus is one of the widely recognised fish species since ancient times. Italy is the most important players in the international arena, however, the introduction of a system of total allowable catches and other measures established by the International Commission for the Conservation of Atlantic Tunas, has deeply changed the competitive positioning of Italy. The aim of this study is to perform an analysis of the comparative advantage of Italy by using the relative trade advantage index. Findings reveal that Italy has gained a competitive advantage in the Maltese market and has suffered a loss of the historical competitive advantage in the Japanese one. Results …

[Is ICD-programming for double intraoperative defibrillation threshold energy safe and effective during long-time follow-up? Results of a prospective…

1999

The aim of this prospective and randomized study was to evaluate the safety and efficacy of a reduced shock strength in transvenous implantable defibrillator therapy. So far clinical data concerning the safety margin of the shock energy in ICD therapy do not exist. The shock energy tested during long-term follow-up in this study was twice the intraoperatively measured defibrillation threshold (DFT). A total number of 176 consecutive patients representing a typical cohort of ICD patients were evaluated. All patients received a non-thoracotomy lead system (CPI, Endotak 0070, 0090) and a biphasic cardioverter-defibrillator with the ability to store episodes (Cardiac Pacemakers Inc., Ventac TM …

Capsaicin desensitization in vivo is inhibited by ruthenium red.

1990

The effect of systemic administration of Ruthenium Red on the excitatory and desensitizing effect of capsaicin was investigated in rats. Ruthenium Red was injected s.c. 30 min before capsaicin was administered. The excitatory effect of capsaicin on corneal, perivascular and visceral afferents was not influenced by treatment with Ruthenium Red. However, determination of the neuropeptide content and evoked neuropeptide release in peripheral organs and dorsal spinal cord 48 h after treatment showed that Ruthenium Red attenuated the 'desensitizing' effect of capsaicin at peripheral, but not at central, endings of primary afferents. On the other hand, a capsaicin-elicited autonomic reflex mediat…

Phenotypic and genetic analysis of udder health using SCC in Valle del Belice dairy sheep

2005

Intramammary infections (IMI) are a complex of inflammatory diseases which are defined as an inflammation of the mammary gland resulting from the introduction and multiplication of pathogenic micro-organisms.

Optimizing intravesical chemotherapy in patients with non muscle invasive bladder carcinoma.

2008

Re: Urinary pH is Highly Associated With Tumor Recurrence During Intravesical Mitomycin C Therapy for Nonmuscle Invasive Bladder Tumor

2011

The authors should be congratulated for their attention to basic and open questions on intravesical therapy of nonmuscle invasive bladder cancer. Intravesical delivery of chemotherapy remains partly empirical, and the pharmacokinetics poorly understood. Every attempt to optimize intravesical therapy should be welcomed. Expensive new strategies to deliver an effective therapeutic tumor dose are currently being explored.1,2 It is reasonable (and mandatory) first to consider and study the basic principles of pharmacokinetics. In this retrospective study Maeda et al investigate the role of pH on the efficacy of intravesical mitomycin C (MMC) in vivo. Their experience shows that urinary pH highe…

Adjuvant intravesical therapy in intermediate risk non-muscle invasive bladder cancer (NMIBC) recurring after first cycle of intravesical treatment.

2011

Introduction and objectives The therapeutic management of intermediate risk NMI-BC recurring after intravesical therapy (IT) is not established. Cystectomy will be offered to patients at higher risk of progression but the majority will be retreated by IT. Although some Authors suggest BCG when intravesical chemotherapy (ICH) fails, some patients are retreated by ICH and some others repeat BCG adopted as first-line treatment. Not many studies have been published on this issue. The response to retreatment by intravesical therapy in terms of recurrence-free rate (RFR) and recurrence-free survival (RFS) is analyzed in 179 intermediate-risk patients. Materials and methods Only intermediate-risk …

A phase I-II study on intravesical Gemcitabine in superficial bladder papillary tumors

2004

INTRODUCTION AND OBJECTIVE: The possible role of gemcitabine inintravesical therapy of superficial transitional cell carcinoma of the bladder (TCCB) has been suggested. The European Organization for Research and Treatment of Cancer Urological Group validated the use of papillary marker lesion left in the bladder after TUR as the best tool to measure the efficacy of a drug by intravesical route against TCCB. The rsults on 27 patients are herein presented. METHODS: Twenty-seven patients, with recurrent superficial TCCB (Ta-T1, G1-G2), were treated with intravesical gemcitabine for 1 to 3 papillary marker lesions (5-15 mm) left unreseacted after TUR. Twenty-one patients (78%) had recurrent tum…

Work incentive and productivity in Spain

2013

Work incentives are closely related to production performance. This paper presents evidence that the value added of a firm increases when relative labor costs rise, or the level of unemployment increases. Both circumstances imply evidence in favor of the efficiency wage model. This theory is consistent with the views of many managers and personal administrators, who tend to ascribe primary importance to wage setting as an incentive to increase effort. We use a micro panel data set of Spanish manufacturing firms, during the period 2004–2009, to simultaneously estimate a stochastic frontier of a firm’s value added and the inefficiency determinants. The data source is published in the Spanish …