1,721,044 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“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
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Hypogastric Artery Salvage Using an Unibody Bifurcated Aorto-Iliac Graft Associated to Double-Barrel Technique in Spontaneous Isolated Abdominal Aortic Dissection
No full textA 54-year-old male patient was admitted with acute left lower limb ischemia (ALI). Computed tomography (CT) angiogram showed an isolated abdominal aortic dissection (IAAD) with a single entry tear just proximal to the aortic bifurcation and an intramural hematoma (IMH) extending to the descending thoracic aorta. The IAAD involved the left iliac bifurcation, with a flow limiting dissection flap into the internal iliac artery (IIA) and external iliac artery (EIA) thrombosis with femoro-popliteal embolization. A surgical thrombectomy of the femoral arteries was performed. An unibody bifurcated endograft was deployed into the true lumen to cover the entry tear, and a double-barrel technique was employed to restore the flow into the EIA and to preserve the IIA patency. The postoperative period was complicated by a compartment syndrome of the calf, requiring a fasciotomy. Follow-up imaging after 12 months showed complete resolution of the IAAD and patency of the stented vessels
Phlegmasia Cerulea Dolens: A sudden unexpected death with hypothesis of medical malpractice
No full textPhlegmasia Cerulea Dolens (PCD) is a severe and rare form of venous thrombosis of the lower extremities, caused by a subtotal or complete occlusion of venous outflow by a thrombus. PCD should be considered a real medical emergency; complications include necrosis and gangrene of the affected limb, amputation, massive pulmonary embolism and, in extreme cases, the death of the patient. Case Report. A 63-years-old man was admitted to the Emergency room with localized pain on the right calf, hyperthermia, cold sweating and vomiting episodes. Five days prior he developed flu-like symptoms, joint pain and cold sensation unresponsive to treatment. Ultrasound examination showed a deep venous thrombosis of the lower right limb with partial occlusion of common iliac and femoral veins. The patient was treated with low molecular weight heparin given twice daily. He began to develop severe hypotension and metabolic acidosis, with tachycardia and atrial fibrillation. Despite the treatment, there was no improvement and he developed severe sinus node dysfunction. He failed to respond to all resuscitative efforts and died. Family members complained Authority, assuming it was a medical error. The clinical-forensic investigation is essential to determine the causes and manner of death and to assess medical responsibility and liability
Early and Late Results of Kissing Stent Technique in the Management of Aorto-iliac Obstructive Disease
No full textEndovascular treatment of multiples ruptures of post-dissecting thoraco abdominal aortic aneurysm with a custom branched device used as an off the shelf.
No full textEndovascular treatment of PDAA (post dissection aortic aneurysms) is fascinating and challenging .
The Colt branched graft (Jotec/Cryolife, Kennesaw Georgia) , due to its characteristics, can be used
as an off the shelf device especially in urgent/emergency settings. In this report we describe the first
case of a PDAA successfully treated with a Colt device.
Acute Distress Respiratory Syndrome and Cardiac Shock after AngioJet Thrombectomy for Acute Occlusion of an Aortic Endograft
No full textPartial thrombosis or total occlusion of aortic or limb graft are possible complications after endovascular aneurysm repair. Different strategies for therapeutic management are available; these include open surgical techniques or endovascular treatments. The choice of the treatment depends on the patient's clinical conditions and on the timing of the thrombosis. Bypass still remains the first choice in case of chronic occlusion but in the last 10 years, the use of percutaneous mechanical/rheolytic thrombectomy systems is increasing. These devices can be used in case of acute or subacute onset of native arterial and venous thrombosis or embolism and in case of graft occlusion. AngioJet is a percutaneous rheolytic mechanical thrombectomy system. Through a pressurized saline solution jet, a low-pressure zone is made up and the thrombus is fragmented and aspirated by the device. Different transient adverse effects caused by lysis of the thrombus are described such as hemoglobinuria but in some cases the release of high doses of the thrombus degradation products such as heme and adenosine diphosphate can lead to fatal consequences for the patient. We reported a case of an acute onset of acute distress respiratory syndrome, pulmonary edema, cardiac shock, and renal failure following AngioJet thrombectomy in an 81-year-old man with an acute occlusion of an aortic endograft
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