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Carrier Sense Multiple Access (CSMA) based distributed algorithms can attain the largest capacity region asthe centralized Max-Weight policy does. Despite their capabilityof achieving throughput-optimality, these algorithms can eitherincur large delay and have large complexity or only operateover non-fading channels. In this letter, by assuming arbitraryback-of
It has been known that load unaware channel selection in 802.11 networks results in high level interference, and can significantly reduce the network throughput. In current implementation, the only way to determine the traffic load on a channel is to measure that channel for a certain duration of time. Therefore, in order to find the best channel with the minimum load all channels have to be measu
In order to meet the incremental requirements from clients, fifth generation Wireless Local Area Network(WLAN) protocol IEEE 802.11ac provides a lot more throughput than his predecessors. However, in all distributed channel access 802.11 protocols, probability of packet loss increases with respect to number of available stations; consecutive packet losses in link layer activates congestion control
Dynamic Adaptive Streaming over HTTP (DASH)constitutes a large fraction of traffic in the mobile Internet.Mobile devices often use video delivery over Wi-Fi, which is asignificant energy drain. Dynamic Power Saving Mode (DPSM)is one of the most widely-used approaches for Wi-Fi devices tosave power and shorten packet delay. However, DPSM uses afixed timeout before a device goes to sleep, leading to
Background: Elderly people living in nursing homes (NHs) have multiple diseases as well as risk factors that may complicate optimal medication. Malnutrition and impaired renal function are two of those risk factors. Heart failure is common and may often not be treated or diagnosed adequately in elderly patients.Objectives: The aim of this thesis was to explore different risk factors for elderly wi
Vi har upprättat en kohort med 1591 kvinnor från fem vanliga yrken: Operationssköterskor (Op), anestesisköterskor (Ane), undersköterskor på operation (Usk), biomedicinska analytiker som gör ultraljudsundersökningar (BMA) samt lärarinnor (Lär). Enkät har skickats ut vid baseline och i genomsnitt ca 28 månader därefter. Data från uppföljningen är inte analyserade ännu, varför rapporten enbart omfatt
Perfluorerade kemikalier (PFC) är en stor grupp ämnen som är misstänkt hormon- störande. De är svårnedbrytbara och stannar länge i både miljö och människa. De mest kända PFC är PFOS och PFOA. Dessa användes under många år för att im- pregnera textilier, skor, möbler och mattor, i golv- och bilvax och målarfärger, mm. Användningen började minska i början av detta århundrade då PFOS och PFOA ersatte
During locomotion we can use information in the retinal flow field to judge whether we will pass to the left or right of an object in the scene (heading). We can also use information in retinal flow to judge whether an object is moving relative to the scene (flow parsing). Both judgements rely on the brain identifying optic flow (global patterns of retinal motion that are characteristic of self-mo
Previous research has found that moving objects bias heading perception only when they occlude the focus of expansion (FOE) in the background optic flow, with the direction of bias depending on whether the moving object was approached or at a fixed distance from the moving observer. However, the effect of object motion on heading perception was confounded with object position in previous studies.
Gibson (1950) proposed that optic flow provides information about the direction of self-motion (heading) relative to objects in the environment. Llewellyn (1971) pointed out that the change in egocentric direction of an object, "drift", also provides information about whether an observer is passing to the left or right of the object. We compared the precision of heading judgements with flow and dr
This paper studies the problem of determining the absolute pose of a perspective camera observing a scene through a known refractive plane, the flat boundary between transparent media with different refractive indices. Efficient minimal solvers are developed for the 2D, known orientation and known rotation axis cases, and near-minimal solvers for the general calibrated and unknown focal length cas
BACKGROUND: Empirical knowledge around palliative care provision and needs of people with intellectual disabilities is extremely limited, as is the availability of research resources, including expertise and funding. This paper describes a consultation process that sought to develop an agenda for research priorities for palliative care of people with intellectual disabilities in Europe.METHODS: A
A virgin ant queen has only one opportunity in her lifetime to realize her reproductive fitness when she leaves her nest for a mating flight. After successful mating she sheds her wings, excavates a nest and starts laying eggs to initiate her own colony. Here we report the results of our study on two related species of Camponotus ants - day active Camponotus paria and night active Camponotus compr
Abstract in Arabic مع بداية النصف الثاني من القرن الماضي أو تحديدا نهاية العقد الخامس وبداية العقد السادس، انطلقت بدايات الكتابة النسائية الإبداعية في عدد من الدول العربية حتى فرضت الكاتبات العربيات وجودهن بقوة في المشهد الثقافي الإبداعي وتألقن في تقديم التجربة النسوية لاحقا، ليجسدن لنا واقع المرأة ويعبرن عن خصوصيتها الأنثوية وأحاسيسها وتجربتها الاجتماعية آأنثى، فأسمعتنا صوتها عبر شخصيتها المحورية
BACKGROUND: Accurate inflammation reporting in capsule endoscopy (CE) is important for diagnosis and monitoring of treatment of inflammatory bowel disease (IBD). Fecal calprotectin (FC) is a highly specific biomarker of gut inflammation. Lewis score (LS) was developed to standardize quantification of inflammation in small-bowel (SB) CE images.GOALS: Multicenter retrospective study aiming to invest
In this study, batch biohydrogen production by co-digestion of raw rice straw and activated sewage sludge was investigated with different inoculum heat treatment, pH, S/X ratio (based on VS) and substrate sizes under mesophilic condition. In order to achieve a high bio-hydrogen yield and methanogens activity inhibition, heat treatment of inoculum was optimized at different exposure times (30, 45 &
To explore if the brain biomarker neuron-specific enolase (NSE) in combination with a biomarker for stress; CT-proAVP (copeptin), oxidation; peroxiredoxin 4 (Prx4), inflammation; procalcitonin (PCT), or with biomarkers from the heart; midregional proatrial natriuretic peptide (MR-proANP), or troponin T (TnT) can improve the prognostic accuracy of long-term outcome after out-of-hospital cardiac arr
