bluuebunny/crossref_metadata_2025_split huggingface dataset:
Long-term outcome of neonates with suspected Hirschsprung’s disease, but normal rectal biopsy
Authors: Harlev Daniel , Kharenko Oleg , Waxman Jacob , Frankel Tanya , Turner Dan , Ledder Oren 
Published: April 2016

Background and objectives
Hirschsprung’s disease (HD) must always be considered in very early-onset constipation. Although HD has a well-described clinical course, little is known about those neonates in whom HD was excluded. We aimed to describe the long-term clinical outcomes of neonates with a clinical suspicion of HD that was excluded by rectal suction biopsy.

Methods
This is a single-center double-cohort comparative study. Neonates who underwent rectal mucosa biopsy for suspected HD were age and sex matched with healthy controls. A survey on clinical outcomes, stooling patterns, and other gastrointestinal (GI)-related conditions was sent to parents. Pathology slides were re-reported by an experienced histopathologist blinded to the clinical data.

Results
A total of 51 neonates were included [25 cases, 26 controls; 41% males, median time of follow-up 4.25 years (interquartile range 2.7–6.9)]. Nine (36%) of patients in the case group required prolonged laxative use for constipation during the first year of life compared with 0 (0%) controls (P<0.001). This difference was maintained at the end of follow-up, with 5 (20%) versus 0 (0%), respectively (P=0.02). Case neonates were significantly more likely to be hospitalized or to be diagnosed with a chronic GI-related condition than the controls (33 vs. 12%, P=0.01; and 19 vs. 8%, P=0.04, respectively).

Conclusion
Neonatal constipation is associated with long-term GI-related disorders and should be considered clinically significant even when the diagnosis of HD is excluded. Neonates with early-onset abnormal stooling patterns should be monitored with adequate pediatrician or pediatric gastroenterologist follow-up.
Systematic Evaluation of Diagnostic Delay in Pediatric Inflammatory Bowel Disease
Authors: Schoepfer Alain M. , Vavricka Stephan , Safroneeva Ekaterina , Fournier Nicolas , Manser Christine , Frei Pascal , Deltenre Pierre , Rogler Gerhard , Straumann Alex , Ezri Jessica , Nydegger Andreas , Braegger Christian 
Published: April 2016

ABSTRACTWe evaluated the diagnostic delay (time from first symptoms to diagnosis) in 100 pediatric patients with Crohn disease (CD) and 75 patients with ulcerative colitis (UC). Median (interquartile range) diagnostic delay in patients with CD was 4 (2–8) (range 0–82) months compared with 2 (1–7) (range 0–52) months in patients with UC (P = 0.003). The time interval from first physician visit to inflammatory bowel disease diagnosis was longer in patients with CD and UC when compared to the time interval from symptom onset to first physician visit (CD: median 3 vs 1 months, P < 0.001; UC: median 2 vs 0 months, P < 0.001). No specific risk factors were identified for the length of diagnostic delay. Measures should be taken to reduce diagnostic delay.
Nonsinusoidal oscillations underlie pathological phase-amplitude coupling in the motor cortex in Parkinson’s disease
Authors: Cole Scott R. , Peterson Erik J. , van der Meij Roemer , de Hemptinne Coralie , Starr Philip A. , Voytek Bradley 
Published: April 2016

AbstractParkinson’s disease (PD) is associated with abnormal beta oscillations (13-30 Hz) in the basal ganglia and motor cortex (M1). Recent reports show that M1 beta-high gamma (50-200 Hz) phase-amplitude coupling (PAC) is exaggerated in PD and is reduced following acute deep brain stimulation (DBS). Here we analyze invasive M1 electrocorticography recordings in PD patients on and off DBS, and in isolated cervical dystonia patients, and show that M1 beta oscillations are nonsinusoidal, having sharp and asymmetric features. These sharp oscillatory beta features underlie the previously reported PAC, providing an alternative to the standard interpretation of PAC as an interaction between two distinct frequency components. Specifically, the ratio between peak and trough sharpness is nearly perfectly correlated with beta-high gamma PAC (r= 0.96) and predicts PD-related motor deficit. Using a simulation of the local field potential, we demonstrate that sharp oscillatory waves can arise from synchronous synaptic activity. We propose that exaggerated beta-high gamma PAC may actually reflect such synchronous synaptic activity, manifesting as sharp beta oscillations that are “smoothed out” with DBS. These results support the “desynchronization” hypothesis of DBS wherein DBS counteracts pathological synchronization throughout the basal ganglia-thalamocortical loop. We argue that PAC can be influenced by more than one mechanism. In this case synaptic synchrony, rather than the often assumed spike-field coherence, may underlie exaggerated PAC. These often overlooked temporal features of the oscillatory waveform carry critical physiological information about neural processes and dynamics that may lead to better understanding of underlying neuropathology.
Assessing the risks and opportunities in corporate art sponsorship arrangements using Fiske’s Relational Models Theory
Authors: Ryan Annmarie , Blois Keith 
Published: April 2016

Purpose
– The purpose of this paper is to address a particular tension in arts marketing, that is, the ongoing search for balance between achieving artistic excellence and financial stability, while keeping work accessible and satisfying a range of stakeholders, public and private.

Design/methodology/approach
– Using Fiske’s (1992) relational models theory as a framework to categorize different modes of exchange between a sponsor and an arts organization, this paper focusses on the varied nature of interactions between parties.

Findings
– Drawing on data from a longitudinal case study, the authors evaluate the many opportunities and risks associated with sponsorship arrangements and to explore how these become manifest and potentially resolved within the relational structure over time. Moreover, the authors examine how an arts marketer can employ particular relational models of exchange to mitigate the risks of another model which is operational within the sponsorship.

Research limitations/implications
– The aim of this paper is to consider the variety of exchange ongoing in long-term sponsorship arrangements, and in using Fiske’s RM theory, to identify the risk and opportunities associated with these exchanges. The case study examined here is, of course, idiosyncratic in terms of people, time and place. However, what is general, and what the authors wish to draw attention to, is how managers can employ different models of exchange to mitigate risks arising out of the dominance of any one model in the sponsorship relationship.

Practical implications
– For executives involved in the management of sponsorship relationships, a rich understanding of their risks and opportunities is important. For example, rather than assuming that market-based considerations or social bonds to be either wholly positive or negative, in this paper the authors have demonstrated that each can have an important role in the dynamic of sponsorship relationships. Therefore, for example, while strong social bonds will mitigate the risks of market-based mechanisms, the risks of social bonds themselves can be balanced through appropriate intermittent recourse to market-based mechanisms. In any specific sponsorship arrangement it will become a matter of balance, and a development of understanding of the role of market, hierarchical, reciprocal and communal dimensions associated with long-term relationships.

Originality/value
– In this regard, the authors offer six propositions, which capture the mitigation and enhancement of risks and opportunities, respectively, as well as considerations for relationship dynamics arising from the analysis.
A second-order perturbation method for fuzzy eigenvalue problems
Authors: Guo Mengwu , Zhong Hongzhi , You Kuan 
Published: April 2016

Purpose
For eigenvalue problems containing uncertain inputs characterized by fuzzy basic parameters, first-order perturbation methods have been developed to extract eigen-solutions, but either the result accuracy or the computational efficiency of these methods is less satisfactory. This paper presents an efficient method for estimation of fuzzy eigenvalues with high accuracy.

Design/methodology/approach
Based on the first order derivatives of eigenvalues and modes with respect to the fuzzy basic parameters, expressions of the second order derivatives of eigenvalues are formulated. Then a second-order perturbation method is introduced to provide more accurate fuzzy eigenvalue solutions. Only one eigenvalue solution is sought for the perturbed formulation, and quadratic programming is performed to simplify the alpha-level optimization.

Findings
Fuzzy natural frequencies and buckling loads of some structures are estimated with good accuracy, illustrating the high computational efficiency of the proposed method.

Originality/value
Up to the second order derivatives of the eigenvalues with respect to the basic parameters are represented in functional forms, which are used to introduce a second-order perturbation method for treatment of fuzzy eigenvalue problems. The corresponding alpha-level optimization is thus simplified into quadratic programming. The proposed method provides much more accurate interval solutions at alpha-cuts for the membership functions of fuzzy eigenvalues. Analogously, third- and higher-order perturbation methods can be developed for more stringent accuracy demands or for the treatment of stronger nonlinearity. The present work can be applied to realistic structural analysis in civil engineering, especially for those structures made of dispersed materials such as concrete and soil.
Simulation of one dimension shock initiation of condensed explosive by SPH method
Authors: Yang Gang , Liu Rangqi , Hu De'an , Han Xu 
Published: April 2016

Purpose
This paper aims to study the ability of SPH method in simulating shock initiation process. The initiation and subsequent explosion processes of condensed explosive involve high pressure propagation and material large deformation, which increase the simulation difficulty in using traditional mesh-based method. The study aims to take the SPH method as an alternative method to shock initiation simulation.

Design/methodology/approach
The SPH method combined with some correct aspects is applied to simulate the shock initiation process. The condensed explosive is ignited by the impact of high speed flyer. In order to avoid the non-physical penetration between particles of high velocity flyer and condensed explosive, a particle-to-particle contact algorithm is employed. After the ignition, the detonation process of condensed explosive is represented by the ignition and growth model. A modified SPH method based on Riemann-solver is applied to smooth the numerical oscillation at shock front. Two numerical examples are implemented to illustrate the capability of SPH method in shock initiation simulation. One is the interface velocity experiment of PBX-9501. Another is the plate push experiment of PBX-9502. Both of the examples include the shock initiation process of condensed explosive.

Findings
Numerical results show that the shock initiation process of condensed explosive can be well predicted by SPH method. The characteristics of detonation are captured in the simulation. The measured data in numerical examples are also in good agreement with the experimental data.

Research limitations/implications
Because of the research purpose is to study the ability of SPH for shock initiation simulation, only one-dimension numerical examples are discussed in the paper. Therefore, researchers are encouraged to extend and test the proposed method to two or three dimension shock initiation problems simulation.

Originality/value
This paper provides an alternative method for shock initiation simulation. The implemented method can overcome the weaknesses of traditional mesh based method in simulation of shock initiation problems.
Approximation based curvilinear local search for optimization problems
Authors: Yaman Fatih , Yilmaz Asim Egemen , Leblebicioğlu Kemal 
Published: April 2016

Purpose
At this work, we propose a local approximation based search method to optimize any function. For this purpose, an approximation method is combined with an estimation filter, and a new local search mechanism is constituted.

Design/methodology/approach
RBF network is very efficient interpolation method especially if we have sufficient reference data. Here, reference data refers to the exact value of the objective function at some points. Using this capability of RBFs, we can approximately inspect the vicinity each point in search space. Meanwhile, in order to obtain a smooth, rapid and better trajectory toward the global optimum, the alpha-beta filter can be integrated to this mechanism. For better description and visualization, the operations are defined in 2-dimensional search space; but the outlined procedure can be extended to higher dimensions without loss of generality.

Findings
When compared with our previous studies using conventional heuristic methods, approximation based curvilinear local search mechanism provide better minimization performance for almost all benchmark functions. Moreover computational cost of this method too less than heuristics. The number of iteration down to at least 1/10 compared to conventional heuristic algorithm. Additionally, the solution accuracy is very improved for majority of the test cases.

Originality/value
This paper proposes a new search approach to solve optimization problems with less cost. For this purpose, a new local curvilinear search mechanism is built using RBF based approximation technique and alpha-beta estimation filter.
On the iterative methods for weighted linear least squares problem
Authors: Saberi Hashem , Edalatpanah SA 
Published: April 2016

Purpose
The Weighted Linear Least Squares (WLLS) problem has many different applications in sciences and engineering. The purpose of this paper is to introduce an iterative scheme for solving the WLLS problem.

Design/methodology/approach
By considering the splitting techniques in conjunction with Generalized Accelerated Over-relaxation (GAOR) method the authors design a new iterative method to solve the weighted linear least squares problem. Furthermore, within the computational framework, some models of iterative schemes candidates are investigated and evaluated.

Findings
In this paper, the authors propose an efficient iterative scheme for solving the WLLS problem. The proposed scheme presented promising results from the aspects of both convergence behavior and performance. Moreover, comparative results for the proposed schemes are also presented.

Research limitations/implications
Comparison between the new methods and other similar methods for the studied problem shows a remarkable agreement and reveals that the new model is much better in comparison with the existing methods in point of view rate of convergence and computing efficiency, as illustrated by the theoretical analysis and numerical results presented.

Originality/value
For solving WLLS more attention has recently been paid on a special class of splitting techniques with the preconditioned GAOR method. In this paper, the authors use a different splitting for the GAOR method and present a promising class of methods. The convergence results of the iterative algorithm are also proposed. Several examples are given to show the efficiency of the presented methods.
Hybrid vibration and rest-to-rest control of a two-link flexible robotic arm using H∞ loop-shaping control design
Authors: sayahkarajy Mostafa , Mohamed Z , Faudzi A.A.M. , Supriyanto E. 
Published: April 2016

Purpose
This study presents a method for simultaneous motion and vibration control of light-weight slender robotic arms, known as flexible manipulators. In this paper, a new control algorithm is proposed for a two-link manipulator with elastic links.

Design/methodology/approach
The controller includes a MIMO H∞ Loop-Shaping Design (H∞LSD) as the feedback controller, and a command pre-shaping filter as the feed-forward controller. The conventional inputs and outputs of a typical two-link manipulator , that consists of the torques applied by the actuators at the joints, and the joint angles are chosen for the feedback control.

Findings
It is shown that by selecting a proper desired loop shape, the H∞LSD is able to control the joint angles of the manipulator, and simultaneously, suppress vibrations of the system so that the high frequency chatter due to the structural vibration modes does not appear at the outputs. Then it is shown that when the H∞LSD is equipped with a command pre-shaping filter, more efficient suppression of the chatter at the tip of the manipulator is achieved. The capability and effectiveness of the proposed control strategy in driving and stabilizing the manipulator to desired positions and simultaneously suppressing structural vibrations is shown by the simulation of the flexible manipulator in rest-to-rest maneuvers.

Practical implications
Flexible Manipulator, Space Manipulators

Originality/value
A robust MIMO controller is proposed for simultaneous motion and vibration control of flexible manipulator.
Numerical investigation of clocking effect on a centrifugal pump with inlet guide vanes
Authors: QU WANSHI , tan lei , CAO Shuliang , WANG YUCHUAN , XU YUN 
Published: April 2016

Purpose
The paper aims to investigate the clocking effect on a centrifugal pump with inlet guide vanes (IGVs).

Design/methodology/approach
The paper uses a computation fluid dynamics (CFD) framework to solve the unsteady flows in a centrifugal pump with inlet guide vanes. The relative position between the stationary vanes and the stationary volute tongue is defined as the clocking position when IGVs inside the suction pipe rotate along the circumferential direction.

Findings
The results show that clocking positions have little effect on the pump head and efficiency, however their influences are obvious for the pressure fluctuation and flow field in the centrifugal pump. The maximum difference of pressure amplitude at dominant frequency reach up to 28% on the monitoring point V8 at different clocking positions under design flow rate. For the large flow rate, the clocking effect on flow field and pressure fluctuation in centrifugal pump is similar to that of design flow rate. However, the clocking effect is nearly negligible at partial flow rate, because there are reverse flows around the tongue tip and obvious vortexes forming and developing in the impeller. Those complex phenomena interacting in the centrifugal pump make the clocking effect less evident.

Originality/value
The numerical investigation reveals the clocking effect on a centrifugal pump with inlet guide vanes, which also valuable for the stable operation and optimal design of centrifugal pumps.
Capital factors and rural women entrepreneurship development
Authors: Kungwansupaphan Chonnatcha , Leihaothabam Jibon Kumar Sharma 
Published: April 2016

PurposeThe purpose of this paper is to investigate the roles of four specific capital factors, namely, human, social, institutional and financial capitals, in rural women entrepreneurship. The focus was on the handloom sector in Manipur, India.Design/methodology/approachThis paper uses qualitative research methodology with a multiple case study approach. Data were collected using in-depth interviews to study seven cases of rural women entrepreneurs.FindingsThe study highlights that human, social, institutional and financial capitals play significant roles in encouraging rural women to engage in entrepreneurial activities and influence strategic decisions. Each capital factor being interrelated, achieving the integration among them will considerably enhance entrepreneurial success.Research limitations/implicationsThe main limitation is the narrow scope, emphasizing on only four capital factors. There are implications for further work on other types of capital. The study being sector specific, limits generalization. It contributes insights into the need for multi-sector examinations in the literature.Practical implicationsRural women entrepreneurship needs are in line with understanding the roles of capital factors and their interrelations. The role of capital factors varies between prior and no prior entrepreneurial experiences.Originality/valueThis study provides information on the role of capital factors on rural women entrepreneurship and contributes to better understanding of how each capital factor is accumulated and utilized in rural women entrepreneurship development using the perspective of handloom sector in Manipur, India.
Revisiting Okun’s Law in European Union countries
Authors: Economou Athina , Psarianos Iacovos N. 
Published: April 2016

Purpose
– The purpose of this paper is to examine Okun’s Law in European countries by distinguishing between the transitory and the permanent effects of output changes upon unemployment and by examining the effect of labor market protection policies upon Okun’s coefficients.

Design/methodology/approach
– Quarterly data for 13 European Union countries, from the second quarter of 1993 until the first quarter of 2014, are used. Panel data techniques and Mundlak decomposition models are estimated.

Findings
– Okun’s Law is robust to alternative specifications. The effect of output changes to unemployment rates is weaker for countries with increased labor market protection expenditures and it is more persistent for countries with low labor market protection.

Originality/value
– The paper provides evidence that the permanent effect of output changes upon unemployment rates is quantitatively larger than the transitory impact. In addition, it provides evidence that increased labor market protection mitigates the adverse effects of a decrease in output growth rate upon unemployment.
How does the minimum wage affect employment statuses of youths?: evidence of Indonesia
Authors: Pratomo Devanto Shasta 
Published: April 2016

Purpose– The purpose of this paper is to examine the effects of minimum wage on youth employment across employment statuses in Indonesia. This study uses the National Labour Force Survey (Sakernas) from 2010 to 2012.Design/methodology/approach– This study uses a multinomial logit model to see the youth distribution across different employment status changes as a result of an increase in the minimum wage. Five categories of youth employment statuses are examined including self-employed; unpaid family workers; paid employees in the covered sector; paid employees in the uncovered sectors; and unemployed. The model is examined separately for urban and rural areas, as well as for the male and female youth labour market.Findings– The results generally suggest that an increase in minimum wage decrease the probability of youth being employed in the covered sector, i.e. paid employment in the covered sector and increase the probability of youth being employed in the uncovered sectors, including self-employed, unpaid family workers, and paid employment in the uncovered sectors. This study indicates a displacement effect for youths from the covered sector into the uncovered sector as suggested by the two-sector model. The specific results are different across urban and rural labour markets, as well as across males and females.Originality/value– Compared to the developed country studies, the studies on the effects of minimum wage on youth employment in developing countries is relatively limited. The sample from Indonesian labour market with a large informal sector has never been used for these purposes. This study also contributes to the literature by using the particular definition of the covered-uncovered sector to the Indonesian labour market based on the employment status and individual wage data.