Multimedia Content Distribution in Hybrid Wireless Networks using Weighted Clustering

Fixed infrastructured networks naturally support centralized approaches for group management and information provisioning. Contrary to infrastructured networks, in multi-hop ad-hoc networks each node acts as a router as well as sender and receiver. Some applications, however, requires hierarchical arrangements that-for practical reasons-has to be done locally and self-organized. An additional challenge is to deal with mobility that causes permanent network partitioning and re-organizations. Technically, these problems can be tackled by providing additional uplinks to a backbone network, which can be used to access resources in the Internet as well as to inter-link multiple ad-hoc network partitions, creating a hybrid wireless network. In this paper, we present a prototypically implemented hybrid wireless network system optimized for multimedia content distribution. To efficiently manage the ad-hoc communicating devices a weighted clustering algorithm is introduced. The proposed localized algorithm deals with mobility, but does not require geographical information or distances.Comment: 2nd ACM Workshop on Wireless Multimedia Networking and Performance Modeling 2006 (ISBN 1-59593-485

THE PRINCIPLE OF SUBSIDIARITY – THE LEGAL BASIS FOR THE PARTICIPATION OF NATIONAL PARLIAMENTS AT THE EUROPEAN UNION’S LEGISLATIVE ACTIVITY

The communication aims to emphasize the context in which the principle of subsidiarity was adopted, clarifying the dilemma about its purpose: is it a legal instrument to protect national sovereignty of the European Union’s Member States or is it a legal instrument which accelerates their federal integration. The document also approaches the problem of the Romanian Parliament in adapting procedures to the Lisbon Treaty, Protocol no. 2 on applying principles of subsidiarity and proportionality. In the described context it shall be discussed the controversial subject regarding the sovereignty transfer whenever the national parliament performs a subsidiarity check on, an EU draft legislative act

Estimated variability of below-cloud aerosol removal by rainfall for observed aerosol size distributions

International audienceBelow-cloud scavenging (BCS) coefficients of aerosols by rainfall are estimated for reported aerosol size distributions measured during field experiments in various environments. The method employed is based on explicit calculations of the efficiency of collision between a raindrop and aerosol particles. Results show that BCS coefficient increases with rainfall rate and has a significant dependence on aerosol size distribution parameters. Thus, BCS is important for very small particles (with diameters less than 0.01 µm) and for coarse particles (with diameters larger than 2 µm). For rainfall rate R ~ 1 mm hr -1, the 0.5-folding time of these particles is of the order of one hour. It is shown that BCS is negligible for aerosol particles in the range [0.1-1] µm if compared with in-cloud scavenging rates for low and moderate rainfall rates (R ~ 0.1-10 mm hr -1). The results indicate that a boundary layer aerosol size distribution with coarse mode is drastically affected very shortly after rain starts (in a fraction of one hour) and consequently, the below-cloud aerosol size distribution becomes dominated by particles in the accumulation mode

Treatment of lipomas and diffuse lipomatosis with NDYAG 1064 NM laser and their impact on the quality of life

Lipomas, the most common type of benign tumours, are generally developed from adipose tissue and present an incidence of 2.1 per 1000 inhabitants. In addition to lipomas, at least three other maladies of the adipose tissue lead patients to consult a doctor, especially for aesthetic purposes: multiple familial lipomatosis, diffuse congenital lipomatosis, and adiposa doloris. Unlike lipomas, these maladies are characterized by numerous lipomas, encapsulated or not, of different sizes, symmetrical or not, which may appear in the neck, limbs, or the trunk, sometimes being painful. The life quality of these patients is affected, not only from an aesthetic point of view but also from medical considerations, like pain. Chemical lipolysis has proven unsatisfactory for patients due to several reasons: the prolonged therapy, high cost, the partial dissolution of the lipomatosis, and high recurrence at one year. Surgical treatment remains the only viable option; sometimes when numerous lipomatous tumors required large and numerous incisions, treatment was refused by patients. The result after laser liposuction is excellent, the recovery time is short, without much pain for the patient, with minimal ecchymoses and edemas, without any recurrence in time, and with an excellent degree of patient satisfaction

Risk factors, predictive markers and prevention strategies for intrauterine fetal death. An integrative review

According to World Health Organization (WHO), fetal death is defined as the death of the fetus prior to its complete expulsion, independent of the duration of pregnancy, thus only ascribing the term stillbirth to fetal deaths in the case of pregnancies after 28 weeks of gestation. The great progress of perinatology care is reflected in a significant reduction in the rate of stillbirths, especially in well-developed countries, with approximately 98% of stillbirth cases now occurring in poor and developing countries. Stillbirth powerfully impacts both the patient and the practitioner. Because nearly half of stillbirth cases result from apparently uncomplicated pregnancies, we considered it critical to review the known predictive markers for intrauterine fetal death. In both preterm and term infants, perinatal mortality is increased in fetuses small for their gestational age, and this risk grows proportionally with the severity of the fetal growth restriction. A protracted first stage of labor has not been associated with an increased risk of perinatal mortality and morbidity, but a prolonged second stage of labor has been associated with mortality and neonatal morbidity characterized by sepsis, seizures, and hypoxic-ischemic encephalopathy. Ultrasound examination of the placenta and the umbilical cord is essential for appropriate pregnancy monitoring. Various findings from ultrasound examination have been related to variable adverse perinatal outcomes, including intrauterine fetal death. After reviewing the evidence for predictors of intrauterine fetal death, we offer a general strategy for reducing the likelihood of stillbirths

Diabetes mellitus and necrotizing fasciitis – a deadly combination; case report

Necrotizing fasciitis is a rapidly destructive affliction of soft tissues, with a mortality rate that may reach 73% of the cases. It is characterized by a progressive inflammation and extended necrosis of the subcutaneous tissue and the fascia. Necrotizing fasciitis was first described in 1848, and later in 1920 Meleney identified 20 patients in China in which the infection was presumably triggered by hemolytic streptococcus, linking pathological bacteria to the condition. In 1952, Wilson coined the term necrotizing fasciitis although without successfully identifying the specific pathological bacteria involved. In most cases, both risk and aggravating factors are present, the main risk factors being diabetes mellitus, liver cirrhosis, renal failure, and immunosuppressant states. Location may vary, but most frequently the disease occurs in the limbs, the trunk, and the perineum. Treatment depends on the location and the time of diagnosis and may range from large incisions with extensive debridement to organ amputations such as those of the limbs or breasts. Treatment is complex and expensive, and besides surgery, includes the administration of broad-spectrum antibiotics, anti-inflammatory drugs, intensive therapy support, and long-term hospitalizations. The prognosis is guarded. The present case entails a 56-year old female patient who presented with many risk factors favoring the occurrence of necrotizing fasciitis, namely diabetes mellitus, liver cirrhosis (decompensated with ascites and portal encephalopathy phenomena), untreated hepatitis B infection, chronic renal failure with diabetic nephrotic syndrome, and obesity

Scavenging of ultrafine particles by rainfall at a boreal site: observations and model estimations

International audienceValues of the scavenging coefficient were determined from observations of ultrafine particles (with diameters in the range 10?510 nm) during rain events at a boreal forest site in Southern Finland between 1996 and 2001. The estimated range of values of the scavenging coefficient was [7×10?6?4×10?5] s?1, which is generally higher than model calculations based only on below-cloud processes (Brownian diffusion, interception, and typical charge effects). A new model that includes below-cloud scavenging processes, mixing of ultrafine particles from the boundary layer (BL) into cloud, followed by cloud condensation nuclei activation and in-cloud removal by rainfall, is presented. The effective scavenging coefficients estimated from this new model have values comparable with those obtained from observations. Results show that ultrafine particle removal by rain depends on aerosol size, rainfall intensity, mixing processes between BL and cloud elements, in-cloud scavenged fraction, in-cloud collection efficiency, and in-cloud coagulation with cloud droplets. Implications for the treatment of scavenging of BL ultrafine particles in numerical models are discussed

Impacts from ice-nucleating bacteria on deep convection: implications for the biosphere-atmosphere interaction in climate change

International audienceA cloud modeling framework is described to simulate ice nucleation by biogenic aerosol particles, as represented by airborne ice-nucleation active (INA) bacteria. It includes the empirical parameterization of heterogeneous ice nucleation. The formation of cloud liquid by soluble material coated on such insoluble aerosols is represented and determines their partial removal from deep convective clouds by accretion onto precipitation. Preliminary simulations are performed for a case of deep convection over Oklahoma. If present at high enough concentrations, as might occur in proximity to land sources, INA bacteria are found to influence significantly: – (1) the average numbers and sizes of crystals in the clouds; (2) the horizontal cloud coverage in the free troposphere; and (3) precipitation and incident solar insolation at the surface, which influence rates of bacterial growth. At lower concentrations, the corresponding responses of cloud fields appear much lower or are ambiguous. In nature, the growth rates of INA bacteria on leaves prior to emission into the atmosphere are known to be highly dependent on temperature, precipitation and plant species. Consequently, the open question emerges of whether emissions of such ice-nucleating biogenic particles can then be modified by their own effects on clouds and atmospheric conditions, forming a weak feedback in climate or microclimate systems

Abdominal-pelvic pain in female patients with endometriosis - a review of the literature

Abdominal-pelvic pain is the dominant symptom in endometriosis, one of the most common pathologies that affect women, being also a multifactorial disorder. Exploratory laparoscopy allows the correct assessment of the location as well as severity and extent of the lesions, thus representing the current gold standard in diagnosis. The correlation of pain intensity with the evolutionary stage of endometriosis is inconstant. Surgical treatment, preferably performed laparoscopically, includes the excision of the ectopic endometrium, having as a primary objective the control of persistent pain and the removal of all endometriotic foci. This procedure helps to improve the life quality of the patient, to reduce relapses, to control postoperative pain, and to eliminate the disease. Pre- and post-operative adjuvant medical treatment is used due to its effects on the symptomatology, prolonging the asymptomatic period of the disease. Despite the use of the above procedures, there are cases in which the abdominal-pelvic pain persists even after surgery, which makes endometriosis a significant challenge for both the specialist and the patient, as well as for the medical system itself, as the study of the pathogenic mechanisms is yet the subject of numerous studies. Nutritional education in these patients is essential, given the recommendation to restrict the range of foods and to increase other foods that have an important role in reducing the risk or even leading to regression of the endometrial pathology