41 research outputs found
Time and space in collaborative information seeking: the clash of effectiveness and uniqueness
No full textCollaboration takes place at different time-space conditions. Past research has shown that these two dimensions may have different implications in the collaboration process, as well as on its outcomes, depending upon the task being performed. In collaborative information seeking (CIS), as a relatively new topic in information science, little is known about the effects of different temporal-spatial contexts. To address this, we conducted a user study involving 80 participants in 40 pairs, which were assigned to four experimental conditions, namely: co-located, remotely located with text chat, remotely located with audio chat, and synchronous. Using quantitative methods, we investigated the effects of these conditions on communication, information synthesis, productivity, and user experience. Results regarding the space dimension suggest that information seeking behaviors of co-located users tend to overlap thus affecting their coverage of diverse and useful information. Conversely, when team members are remotely located, limited interaction allows them to work more independently, leading them to explore more diverse and useful information with the added value of less cognitive and affective load. With respect to the time dimension, we found that asynchronous collaboration enables participants to reach high levels of independency at the cost of effectiveness. These results provide practical implications about how various spatial-temporal contexts in CIS could influence factors such as productivity, efficiency, effectiveness, and uniqueness.Peer reviewedArticle first published online January 24, 2013, and journal issued 2012, according to the publisher's website
Étude odontologique des hommes de Muge
No full textRÉSUMÉ ANGLAIS. With the study of the denture of the mesolitic portuguese men, the author describe a new method to measure the coronal diameters and a new dental measurment, the perimeter of the cervix. A new index called « indice syndesmo-coronaire » is proposed in order to estimate the widening outwards degree of the mesial and distal surfaces. Classical methods of investigation are also employed by the author who attempt to draw up phylogenetical comparisons.RÉSUMÉ. A l'occasion d'une étude sur la denture des Hommes du Mésolithique portugais, l'auteur décrit une nouvelle méthode de mensuration des diamètres coronaires et une nouvelle mensuration, le périmètre au collet. Un nouvel indice appelé indice syndesmo-coronaire est proposé pour évaluer le degré d'évasement des faces proximales des couronnes. Enfin, utilisant les méthodes classiques d'investigation l'auteur tente d'établir des comparaisons phylogénétiques.Lefèvre J. Étude odontologique des hommes de Muge. In: Bulletins et Mémoires de la Société d'anthropologie de Paris, XII° Série. Tome 10 fascicule 3, 1973. pp. 301-333
Cohn Path Algebras have Invariant Basis Number
No full textKanuni, Muge/0000-0001-7436-039XWOS: 000363286700026For any finite directed graph E and any field K, we show that the Cohn path algebra C-K(E) has the Invariant Basis Number property, and the Invariant Matrix Number property.Simons Foundation [208941]; U.S. Department of State; Scientific and Technological Research Council of Turkey (TUBITAK-BIDEB)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [2219]The first author is partially supported by a Simons Foundation Collaboration Grants for Mathematicians Award #208941. The second author is supported by a U.S. Department of State 2012-2013 Fulbright Visiting Scholar Program Grant and by the Scientific and Technological Research Council of Turkey (TUBITAK-BIDEB) 2219 International Post-Doctoral Research Fellowship during her sabbatical visit to the University of Colorado at Colorado Springs
Evaluation of the success and complication rates of endoscopic retrograde cholangiography according to the difficulty of the procedure
No full textAbstract Endoscopic retrograde cholangiopancreatography (ERCP), is an invasive procedure with a high complication rate used in the diagnosis and treatment of pancreaticobiliary system diseases. A system that grading the difficulty and complexity of the ERCP procedure has been developed by the American Society of Gastrointestinal Endoscopy (ASGE). The aim of the study is to evaluate the degree of difficulty of ERCP procedures according to the ASGE grading system and its effectiveness in predicting the success and complications of the procedure. A total of 600 patients who underwent ERCP were evaluated retrospectively. Of all ERCP procedures, 5.5% were classified as ASGE 1, 46.8% as ASGE 2, 39% as ASGE 3, and 8.6% as ASGE 4. In all procedures, the successful cannulation rate was 96.3%, the technical success rate was 96%, and the clinical success rate was 94.8%. The procedure's success decreased linearly and the need for repetition increased linearly as the ASGE grade increased (p > .05). In terms of complications, there was no statistical difference between ASGE 1–3 and 4. We believe that the ASGE grading system will be useful in clinical practice, particularly for less experienced endoscopists in ERCP procedures
New formulae for Zagreb indices
No full textInternational Conference on Numerical Analysis and Applied Mathematics (ICNAAM) -- SEP 19-25, 2016 -- Rhodes, GREECEIn this paper, we study with some graph descriptors also called topological indices. These descriptors are useful in determination of some properties of chemical structures and preferred to some earlier descriptors as they are more practical. Especially the first and second Zagreb indices together with the first and second multiplicative Zagreb indices are considered and they are calculated in terms of the smallest and largest vertex degrees and vertex number for some well-known classes of graphs.Uludag UniversityUludag University [F-2015/17, F-2015/23]; Selcuk UniversitySelcuk UniversityThe first author was supported by the Research Fund of Uludag University project no: F-2015/17, F-2015/23. The last author is supported by Selcuk University Research Fund
Smoking Cessation Rates among Pregnant Women and Their Relapse Rates in the Postpartum Period in Samsun
No full textObjective: This research aimed to determine the smoking frequency and smoking-related gestational and postpartum health problems in our study population. We investigated the quit rate during pregnancy and relapse after giving birth. The study was conducted in two university family health centers. A total of 270 women aged 18–45 with children were included in the study. Following receipt of verbal consent, the cases’ demographic data, previous obstetric information, smoking status, and gestational weight gain (GWG) were collected through face-to-face interviews and electronic records. The participants’ mean age was 35.75 ± 6.9 years and 28.1% were current smokers. Forty-one participants (16%) smoked during pregnancy, while the secondhand smoking rate was 30%. Ex-smokers experienced greater GWG (17.5 ± 1.7 kg (p = 0.003)) than current smokers and non-smokers. Small gestational age (SGA) and health problems in the first year of life were more frequent in the babies of smoker mothers (p p = 0.035) and high GWG (0.98 Exp(B), p = 0.01) were identified as independent risk factors for relapse. Our results indicate that many of the smoker women quit during pregnancy. Special interventions may increase the quitting rate in pregnancy and reduce the subsequent relapse rate
Incisional hernia as an unusual cause of hepatic encephalopathy in a 62-year-old man with cirrhosis: a case report
No full textAbstract Introduction Hepatic encephalopathy may be initiated by many factors such as gastrointestinal bleeding, infections, fluid and electrolyte disturbances. Hypokalemia is one of the most commonly encountered electrolyte abnormalities causing hepatic encephalopathy in patients with cirrhosis. Case presentation We present the case of a 62-year-old Caucasian man with decompensated liver cirrhosis having multiple episodes of hepatic encephalopathy precipitated by vomiting. He had an incisional hernia at the right lumbar region. A barium contrast study of the small intestine and magnetic resonance imaging showed that the hernial sac included gastric antrum and bowel. We observed that hepatic encephalopathy coincided with hypokalemia as a result of a large volume of vomiting triggered by the collapsed hernial sac. Hepatic encephalopathy was resolved by administration of intravenous potassium. Conclusion This case illustrates that a hernia causing a large volume of vomiting may be a precipitant factor in the development of hepatic encephalopathy.</p
Endoscopic Evaluation and Helicobacter Pylori Prevalence in Dyspeptic Patients with Chronic Kidney Disease
No full textAbstract: Objective: Dyspepsia is a common symptom in chronic kidney disease (CKD) as well as in the normal population and may develop due to functional or organic causes. In the literature, there are different results about dyspepsia symptoms, upper gastrointestinal tract lesions and Hp prevalence in CKD. In this study, endoscopic findings and the prevalence of Helicobacter Pylori (Hp) in dyspeptic chronic kidney patients were investigated and compared with the normal population.Materials & Methods: 67 patients with dyspeptic CKD (52 hemodialysis, 6 continuous ambulatory peritoneal dialysis, 9 predialysis) and 63 age and gender-matched control groups were included in our study. Gastrointestinal symptom scoring, upper endoscopic examination, histopathological examination of gastric antrum and corpus biopsies taken during this period, and rapid urease test (RUT) for Hp were performed on all cases included in the study.
Results: Gastrointestinal symptom scores were not different between the CKD and control groups (6.2±2.5 vs 7.7±3.6) (p>0.05). Although the prevalence of Hp in the CKD group (44.8%) was lower than the control group (54%) according to gastric biopsy findings, there was no difference between them (p>0.05). In the endoscopic examination, duodenal ulcer was more common in the control group and duodenitis in the CKD group, and the difference between them was significant (p<0.05). When compared with histopathological evaluation, the sensitivity (78% vs. 79%) and specificity (95% vs. 93%) of the urease test were similar in the CKD and control groups in both groups.
Conclusion: Gastrointestinal symptom score and Hp prevalence in chronic kidney disease were similar to the control group. No correlation was found between Hp and gastrointestinal symptom score. In the endoscopic examination, duodenal ulcer was more common in the control group and duodenitis was more common in the CKD group
Does the Time of Day have an Effect on the Success and Complications of ERCP?
No full textAbstract: Background: In ERCP, if modifiable risk factors can be minimized, indirectly, the rates of complications will also decrease.
Objective: In the present study, the aim is to investigate whether the timing of ERCP (morning versus afternoon) was associated with the success of cannulation and procedure-related complications in patients with bile duct stones undergoing ERCP.
Materials and Methods: This is a retrospective study of patients who underwent ERCP for common bile duct (CBD) stones. We compared the complication rate and the success of CBD cannulation between procedures conducted in the morning and those carried out in the afternoon during ERCP.
Result: A total of 402 patients were enrolled. The mean age of patients was 64.4 ± 19 years with a total bilirubin value of 7.5 ± 11.6 mg/dL, direct bilirubin value of 4.9 ± 8.6 mg/dL, and CBD of 11±2.4 mm. 201 (50%) of the patients underwent ERCP in the morning and 201 (50%) in the afternoon. The rates of post-ERCP pancreatitis, bleeding, and the success of cannulation were 5.5%, 10%, and 96.5% in the morning ERCP group and 5%, 13.4%, and 93% in the afternoon ERCP group, respectively. There were no statistically significant differences between groups in post-ERCP pancreatitis (p=0.606), bleeding (p=0.277), and the success of CBD cannulation (p=0.117).
Conclusion: Between morning and afternoon ERCP procedures, no statistically significant difference was detected
