bluuebunny/crossref_metadata_2025_split huggingface dataset:
Ticking Away the Moments: Timing Regularity Helps to Better Predict Customer Activity
Authors: Platzer Michael , Reutterer Thomas 
Published: May 2016

Accurate predictions of a customer’s activity status and future purchase propensities are crucial for managing customer relationships. This article extends the recency–frequency paradigm of customer-base analysis by integrating regularity in interpurchase timing in a modeling framework. By definition, regularity implies less variation in timing patterns and thus better predictability. Whereas most stochastic customer behavior models assume a Poisson process of “random” purchase occurrence, allowing for regularity in the purchase timings is beneficial in noncontractual settings because it improves inferences about customers’ latent activity status. This especially applies to those valuable customers who were previously very frequently active but have recently exhibited a longer purchase hiatus. A newly developed generalization of the well-known Pareto/NBD model accounts for varying degrees of regularity across customers by replacing the NBD component with a mixture of gamma distributions (labeled Pareto/GGG). The authors demonstrate the impact of incorporating regularity on forecasting accuracy using an extensive simulation study and a range of empirical applications. Even for mildly regular timing patterns, it is possible to improve customer-level predictions; the stronger the regularity, the greater the gain. Furthermore, the cost in terms of data requirements is marginal because only one additional summary statistic, in addition to recency and frequency, is needed that captures historical transaction timing. Data, as supplemental material, are available at http://dx.doi.org/10.1287/mksc.2015.0963 .
Placement of iliosacral screws using 3D image-guided (O-Arm) technology and Stealth Navigation
Authors: Theologis A. A. , Burch S. , Pekmezci M. 
Published: May 2016

Aims We compared the accuracy, operating time and radiation exposure of the introduction of iliosacral screws using O-arm/Stealth Navigation and standard fluoroscopy. Materials and Methods Iliosacral screws were introduced percutaneously into the first sacral body (S1) of ten human cadavers, four men and six women. The mean age was 77 years (58 to 85). Screws were introduced using a standard technique into the left side of S1 using C-Arm fluoroscopy and then into the right side using O-Arm/Stealth Navigation. The radiation was measured on the surgeon by dosimeters placed under a lead thyroid shield and apron, on a finger, a hat and on the cadavers. Results There were no neuroforaminal breaches in either group. The set-up time for the O-Arm was significantly longer than for the C-Arm, while total time for placement of the screws was significantly shorter for the O-Arm than for the C-Arm (p = 0.001). The mean absorbed radiation dose during fluoroscopy was 1063 mRad (432.5 mRad to 4150 mRad). No radiation was detected on the surgeon during fluoroscopy, or when he left the room during the use of the O-Arm. The mean radiation detected on the cadavers was significantly higher in the O-Arm group (2710 mRem standard deviation (sd) 1922) than during fluoroscopy (11.9 mRem sd 14.8) (p < 0.01). Conclusion O-Arm/Stealth Navigation allows for faster percutaneous placement of iliosacral screws in a radiation-free environment for surgeons, albeit with the same accuracy and significantly more radiation exposure to cadavers, when compared with standard fluoroscopy. Take home message: Placement of iliosacral screws with O-Arm/Stealth Navigation can be performed safely and effectively. Cite this article: Bone Joint J 2016;98-B:696–702.
Assessment of functional outcomes of surgically managed acetabular fractures
Authors: Dodd A. , Osterhoff G. , Guy P. , Lefaivre K. A. 
Published: May 2016

We performed a systematic review of the literature pertaining to the functional outcomes of the surgical management of acetabular fractures. A total of 69 articles met our inclusion criteria, revealing that eight generic outcome instruments were used, along with five specific instruments. The majority of studies reported outcomes using a version of the d’Aubigne and Postel score, which has not been validated for use in acetabular fracture. Few validated outcome measures were reported. No psychometric testing of outcome instruments was performed. The current assessment of outcomes in surgery for acetabular fractures lacks scientific rigour, and does not give reliable outcome data for either scientific comparison or patient counselling.Take home message: The use of non-validated functional outcome measures is a major limitation of the current literature pertaining to surgical management of acetabular fractures; future studies should use validated outcome measures to ensure the legitimacy of the reported results.Cite this article: Bone Joint J 2016;98-B:690–5.
Ground-reactive forces after hallux valgus surgery
Authors: Ballas R. , Edouard P. , Philippot R. , Farizon F. , Delangle F. , Peyrot N. 
Published: May 2016

Aims The purpose of this study was to analyse the biomechanics of walking, through the ground reaction forces (GRF) measured, after first metatarsal osteotomy or metatarsophalangeal joint (MTP) arthrodesis. Patients and Methods A total of 19 patients underwent a Scarf osteotomy (50.3 years, standard deviation (sd) 12.3) and 18 underwent an arthrodesis (56.2 years, sd 6.5). Clinical and radiographical data as well as the American Orthopaedic Foot and Ankle Society (AOFAS) scores were determined. GRF were measured using an instrumented treadmill. A two-way model of analysis of variance (ANOVA) was used to determine the effects of surgery on biomechanical parameters of walking, particularly propulsion. Results Epidemiological, radiographical and clinical data were comparable in the two groups and better restoration of propulsive function was found after osteotomy as shown by ANOVA (two way: surgery × foot) with a surgery effect on vertical forces (p < 0.01) and a foot effect on anteroposterior impulse (p = 0.01). Conclusion Patients who underwent Scarf osteotomy had a gait pattern similar to that of their non-operated foot, whereas those who underwent arthrodesis of the first (metatarsophalangeal) MTP joint did not totally recover the propulsive forces of the forefoot. Take home message: The main findings of this study were that after surgical correction for hallux valgus, patients who underwent scarf osteotomy had a gait pattern similar to that of their non-operated foot in terms of forefoot propulsive forces (Fz3, Iy2), whereas those who underwent arthrodesis of the first MTP joint had not. Cite this article: Bone Joint J 2016;98-B:641–6.
The rate of dislocation is not increased when minimal precautions are used after total hip arthroplasty using the posterolateral approach
Authors: Kornuijt A. , Das D. , Sijbesma T. , van der Weegen W. 
Published: May 2016

Aims In order to prevent dislocation of the hip after total hip arthroplasty (THA), patients have to adhere to precautions in the early post-operative period. The hypothesis of this study was that a protocol with minimal precautions after primary THA using the posterolateral approach would not increase the short-term (less than three months) risk of dislocation. Patients and Methods We prospectively monitored a group of unselected patients undergoing primary THA managed with standard precautions (n = 109, median age 68.9 years; interquartile range (IQR) 61.2 to 77.3) and a group who were managed with fewer precautions (n = 108, median age 67.2 years; IQR 59.8 to 73.2). There were no significant differences between the groups in relation to predisposing risk factors. The diameter of the femoral head ranged from 28 mm to 36 mm; meticulous soft-tissue repair was undertaken in all patients. The medical records were reviewed and all patients were contacted three months post-operatively to confirm whether they had experienced a dislocation. Results There were no dislocations in the less restricted group and one in the more restricted group (p = 0.32). Conclusion For experienced surgeons using the posterolateral approach at THA and femoral heads of diameter ≥ 28 mm, it appears safe to manage patients in the immediate post-operative period with minimal precautions to protect against dislocation. Larger studies with adequate statistical power are needed to verify this conclusion. Take home message: Experienced orthopaedic surgeons using the posterolateral approach for THA should not fear an increased dislocation rate if they manage their patients with a minimal precautions protocol. Cite this article: Bone Joint J 2016;98-B:589–94.
Migration of a cemented fixed-bearing, polished titanium tibial baseplate (Genesis II) at ten years
Authors: Teeter M. G. , Thoren J. , Yuan X. , McCalden R. W. , MacDonald S. J. , Lanting B. A. , Naudie D. D. R. 
Published: May 2016

Aims The purpose of the present study was to examine the long-term fixation of a cemented fixed-bearing polished titanium tibial baseplate (Genesis ll). Patients and Methods Patients enrolled in a previous two-year prospective trial (n = 35) were recalled at ten years. Available patients (n = 15) underwent radiostereometric analysis (RSA) imaging in a supine position using a conventional RSA protocol. Migration of the tibial component in all planes was compared between initial and ten-year follow-up. Outcome scores including the Knee Society Score, Western Ontario and McMaster Universities Arthritis Index, 12-item Short Form Health Survey, Forgotten Joint Score, and University of California, Los Angeles Activity Score were recorded. Results At ten years, the mean migration of the tibial component was less than 0.1 mm and 0.1° in all planes relative to the post-operative RSA exam. Maximum total point movement increased with time (p = 0.002) from 0.23 mm (sd 0.18) at six weeks to 0.42 mm (sd 0.20) at ten years. Conclusion The low level of tibial baseplate migration found in the present study correlates to the low rate of revision for this implant as reported in individual studies and in joint replacement registries. Take home message: Overall, the implant was found to be well fixed at ten years, supporting its continued clinical use and the predictive power of RSA for determining long-term fixation of implants. Cite this article: Bone Joint J 2016;98-B:616–21.
Total ankle arthroplasty versus ankle arthrodesis
Authors: Pedowitz D. I. , Kane J. M. , Smith G. M. , Saffel H. L. , Comer C. , Raikin S. M. 
Published: May 2016

Aims Few reports compare the contribution of the talonavicular articulation to overall range of movement in the sagittal plane after total ankle arthroplasty (TAA) and tibiotalar arthrodesis. The purpose of this study was to assess changes in ROM and functional outcomes following tibiotalar arthrodesis and TAA. Patients and Methods Patients who underwent isolated tibiotalar arthrodesis or TAA with greater than two-year follow-up were enrolled in the study. Overall arc of movement and talonavicular movement in the sagittal plane were assessed with weight-bearing lateral maximum dorsiflexion and plantarflexion radiographs. All patients completed Short Form-12 version 2.0 questionnaires, visual analogue scale for pain (VAS) scores, and the Foot and Ankle Ability Measure (FAAM). Results In all, 41 patients who underwent TAA and 27 patients who underwent tibiotalar arthrodesis were enrolled in the study. The mean total arc of movement was 34.2° (17.0° to 59.1°) with an average contribution from the talonavicular joint of 10.5° (1.2° to 28.8°) in the TAA cohort. The average total arc of movement was 24.3° (6.9° to 44.3°) with a mean contribution from the talonavicular joint of 22.8° (5.6° to 41.4°) in the arthrodesis cohort. A statistically significant difference was detected for both total sagittal plane movement (p = 0.00025), and for talonavicular motion (p < 0.0001). A statistically significant lower VAS score (p = 0.0096) and higher FAAM (p = 0.01, p = 0.019, respectively) was also detected in the TAA group. Conclusion TAA preserves more anatomical movement, has better pain relief and better patient-perceived post-operative function compared with patients undergoing fusion. The relative increase of talonavicular movement in fusion patients may play a role in the outcomes compared with TAA and may predispose these patients to degenerative changes over time. Take home message: TAA preserves more anatomic sagittal plane motion and provides greater pain relief and better patient-perceived outcomes compared with ankle arthrodesis. Cite this article: Bone Joint J 2016;98-B:634–40.
The Warwick Hip Trauma Evaluation One
Authors: Griffin X. L. , Parsons N. , McArthur J. , Achten J. , Costa M. L. 
Published: May 2016

Aims The aim of this study was to inform a definitive trial which could determine the clinical effectiveness of the X-Bolt Dynamic Hip Plating System compared with the sliding hip screw for patients with complex pertrochanteric fragility fractures of the femur. Patients and Methods This was a single centre, participant blinded, randomised, standard-of-care controlled pilot trial. Patients aged 60 years and over with AO/ASIF A2 and A3 type femoral pertrochanteric fractures were eligible. Results The primary outcome was the EuroQoL 5 Dimension Score (EQ-5D-3L) at one year following index fixation. A total of 100 participants were recruited, and primary outcome data were available for 88 patients following losses to follow-up and withdrawals. The mean difference in EQ-5D was 0.03 (95% confidence interval -0.17, 0.120; p = 0.720.) There were no significant differences in any of the secondary outcomes measures. The recruitment and follow-up rates from this feasibility study were as predicted. Conclusion A definitive trial with 90% power to find a clinically important difference in EQ-5D would require 964 participants based upon the data from this study. We plan to start recruitment to this trial in Spring 2016. Take home message: A definitive trial of X-Bolt Dynamic Hip Plating System is feasible and should be conducted now in order to quantify the clinical effectiveness of this novel implant. Cite this article: Bone Joint J 2016;98-B:686–9.
The impact of neoadjuvant chemotherapy on cardiopulmonary physical fitness in gastro-oesophageal adenocarcinoma
Authors: Sinclair RCF , Navidi M , Griffin SM , Sumpter K 
Published: May 2016

Introduction Operable oesophagogastric adenocarcinoma management in the UK includes three cycles of neoadjuvant chemotherapy (NAC) followed by resection. Determination of oxygen uptake at the anaerobic threshold (AT) with cardiopulmonary exercise testing (CPET) is used to objectively measure cardiorespiratory reserve. Oxygen uptake at AT predicts perioperative risk, with low values associated with increased morbidity. Previous studies indicate NAC may have a detrimental impact on cardiorespiratory reserve. Methods CPET was completed by 30 patients before and after a standardised NAC protocol. The ventilatory AT was determined using the V-slope method, and the peak oxygen uptake and ventilatory equivalents for carbon dioxide measured. Median AT before and after chemotherapy was compared using a paired Student’s t-test. Results Median oxygen uptake at AT pre- and post-NAC was 13.9±3.1 ml/kg/min and 11.5±2.0 ml/kg/min, respectively. The mean decrease was 2.4 ml/kg/min (95% confidence interval [CI] 1.3–3.85; p<0.001). Median peak oxygen delivery also decreased by 2.17 ml/kg/min (95% CI 1.02–3.84; p=0.001) after NAC. Ventilatory equivalents were unchanged. Conclusions This reduction in AT objectively quantifies a decrease in cardiorespiratory reserve after NAC. Patients with lower cardiorespiratory reserve have increased postoperative morbidity and mortality. Preventing this decrease in cardiorespiratory reserve during chemotherapy, or optimising the timing of surgical resection after recovery of AT, may allow perioperative risk-reduction.
The hoodie: Consumer choice, fashion style and symbolic meaning
Authors: Rahman Osmud 
Published: May 2016

Abstract
The death of an unarmed teenager, Trayvon Martin, in Florida in 2012 not only drew public attention to vigilante justice, but also generated public discussion and debate on various issues related to popular culture, race and identity. One item of clothing – the hoodie – attracted massive media interest in this regard. In this exploratory study, the hoodie was used as a vehicle to investigate and illuminate how meanings are produced and perceived. According to the findings of this study, the choice to wear a hoodie can be based solely on such comfort factors as warmth and breathability, but it may also be intended to manifest an individual’s choice or taste. In addition, the study reveals that viewers’ interpretations of an individual’s appearance are not always accurate or aligned with the wearer’s intentions. Without fully understanding the wearer’s intentions and considering situational and contextual factors, misunderstanding, stereotyping, stigmatizing or even demonizing of a person may occur.
From dandyism to ‘Coco’ Chanel: A reassessment of Georg Simmel’s theory of fashion
Authors: Machuco Rosa António 
Published: May 2016

Abstract
In this article, I reassess Georg Simmel’s theory of fashion. I stress the importance of two principles: generalization and differentiation, that for Simmel, guided the change cycle of fashion. An analysis of Simmel’s theory shows that imitation is the root of these two principles, which points to the circular structure of desire. For Simmel, the principle of differentiation was the source of two fashion trends, typified by the slave to fashion and the unmodern individual. I show that this classification should be changed by taking into consideration a third trend: chic anti-fashion. I analyse the chic anti-fashion trend starting with the figure of the first dandy, ‘Beau’ Brummell. Dandyism was the origin of three kinds of fashion. The first was conspicuously ostentatious fashion, which included degenerate forms of dandyism, such as the gandin and the ‘dude’, and the first creations of French haute couture. The second consisted of the bohemian movement of the nineteenth century that was a kind of fashion that is designated as oppositional fashion. The third was chic anti-fashion, which I will examine with the example of ‘Coco’ Chanel, showing that Chanel’s style allowed for the association of functionality and prestige.
Kontextmodellierung für Verkehrssituationen auf Grundlage von Kamerabildern
Authors: Oeljeklaus Malte , Hoffmann Frank , Bertram Torsten 
Published: May 2016

Zusammenfassung
Der Beitrag untersucht die Klassifikation von Verkehrssituationen auf Grundlage von Kamerabildern. Der Kontext der Verkehrssituationen
wird dabei durch eine diskrete Systematik charakterisiert. Hierzu werden durch maschinelles Lernen datenbasierte Modelle jeweils für
spezielle Kategorien von Verkehrssituationen ermittelt. Die vorgeschlagene Methode extrahiert zunächst charakteristische globale
Merkmale aus dem Kamerabild, welche anschließend durch universelle Klassifikationsmodelle ausgewertet werden. Die Verifikation erfolgt
anhand exemplarischer Bilder und Verkehrssituationen.
Modellbasierte Regelung einer zweistufigen Abgasturboaufladung für einen Ottomotor
Authors: Ritter Dennis , Liberda Norman , Abel Dirk , Albin Thivaharan 
Published: May 2016

Zusammenfassung
Zur Wirkungsgradsteigerung von Verbrennungsmotoren spielen verbesserte Luftpfadkonzepte eine Schlüsselrolle. Insbesondere für
Ottomotoren stellt das Konzept der zweistufigen Abgasturboaufladung eine vielversprechende Technologie dar. In diesem Beitrag wird die
Regelung eines solchen Luftpfadkonzeptes untersucht. Dabei handelt es sich um einen Modellbasierten Prädiktiven Regelungsansatz, der in
der Lage ist, den Mehrgrößencharakter des Regelungsproblems zu handhaben, die inhärente Totzeit des Systems zu kompensieren und
Limitierungen für die Drehzahlen der beiden Turboladerstufen zu berücksichtigen. Desweiteren wird der Applikationsaufwand zur
Parametrierung der Regelung verringert. Das untersuchte Regelungskonzept wurde für ein Versuchsfahrzeug mit dem beschriebenen
Aufladekonzept auf einem Prototypen-Steuergerät implementiert und auf einem Abgasrollenprüfstand validiert.
The effect of radiation of LED modules on the growth of dill (Anethum graveolens L.)
Authors: Frąszczak Barbara , Gąsecka Monika , Golcz Anna , Zawirska-Wojtasiak Renata 
Published: May 2016

AbstractLight quality is thought to affect the growth and development of plants. We examined how light influences the growth and content of some chemical compounds in dill (Anethum graveolens L.). The plants were grown under different light quality. The share of orange and green light in the spectrum was constant and amounted to 10% for either colour. In the first combination (A, 70/10), there was 70% of red light and 10% of blue light. Other combinations had the following proportions: B 60/20, C 50/30, D 40/40 and E 30/50 of red and blue light. The PPFD was about 155 μmol m-2 s-1. Blue light inhibited the elongation growth as well as leaf area. It had positive influence on the accumulation of dry mass, glucose and fructose in the herb. In the combinations with higher percentage of red light the plants were characterised by higher content of essential oils, macronutrients and zinc. To sum up, we can say that the proportion of red and blue light has significant influence on the morphological qualities, chemical composition and dynamics of photosynthesis in these plants. On the other hand, the selection of spectral composition of LEDs will depend on the result we want to achieve.
Language functions and medical communication: The human body as text
Authors: Kantz Deirdre , Marenzi Ivana 
Published: May 2016

AbstractThis article presents the findings of a field experiment in medical English with first-year medical students at the University of Pavia, Northern Italy. Working in groups of 8–10, the students were asked to produce a corpus of medical texts in English demonstrating how the human body is itself a meaningful text (
Medical ethics and the learner-centred approach: Developing materials on organ transplant and euthanasia in an English as a foreign language classroom in higher education
Authors: Jamrichová Valéria , Zamborová Katarína 
Published: May 2016

AbstractA learner-centred approach puts students amidst the learning process and helps them become involved in that process. It provides an opportunity for students to choose and direct the course of the lesson. This approach is especially appropriate when dealing with ethical concerns that might be sensitive issues. When it comes to the sources for the development of teaching materials, the Internet provides numerous possibilities. Not only does it enable students to choose from a wide variety of topics but it also offers, for both teachers and students, a chance to develop their own up-to-date materials through which students improve their language skills. Nonetheless, teachers can help their students to become more autonomous and develop strategies for lifelong learning. The aim of this article is to provide ideas on materials development for teaching English as a foreign language to students of medicine and health studies and to link theory and practice in the Slovak context. Specifically, it focuses on how topics in medical ethics, such as organ transplant and euthanasia, could be taught by emphasizing the learner-centred approach. Involving the student in the learning process and using the Internet as an easily accessible source enables students to develop their skills and strategies, which will help them become more autonomous, and thus develop their confidence in dealing with authentic English outside the classroom.