bluuebunny/crossref_metadata_2025_split huggingface dataset:
Generic pulse width modulation model, based on generalized inverses and applied to voltage source inverters
Authors: Paul-Etienne Vidal , Cailhol Simon , Rotella Frédéric , Fadel Maurice 
Published: April 2019

Purpose
This paper aims to develop a method for a unified model of pulse width modulation (PWM) voltage source inverters (VSI). This generic method, based on a common and easy-to-use carrier-based modulation, allows to generate the exhaustive solution set for a given PWM-VSI.

Design/methodology/approach
The use of the generalized inverse theory is developed to express the PWM solution set for the duty cycle. Indeed, the infinite number of PWM solutions is demonstrated. To explore this solution set, the unified model described exhibits degrees of freedom. The admissible margins to set the degree of freedom are highlighted. Some experimental results are presented.

Findings
It is demonstrated how the degree of freedom can be directly connected with efficiency indicators such as common mode voltage, inverter linearity and switching losses. The expression of the PWM solution set boundaries is clearly expressed.

Research limitations/implications
Further studies should explore how the degree of freedom can be connected with parameters associated with the current (and not the voltage as described in this paper).

Practical implications
The paper includes implications for the development of a more generic approach for PWM multilevel VSI.

Originality/value
This paper fulfils a mathematical frame to ease the expression of PWM scheme.
Characteristics extraction and numerical analysis of the rough surface macro-morphology
Authors: Sun Qingchao , Mu Xiaokai , Yuan Bo , Xu Jiawen , Sun Wei 
Published: April 2019

PurposeThis paper aims to distinguish the relationship between the morphology characteristics of different scales and the contact performance of the mating surfaces. Also, an integrated method of the spectrum analysis and the wavelet transform is used to separate the morphology characteristics of the actual machined parts.Design/methodology/approachFirst, a three-dimensional (3D) surface profilometer is used to obtain the surface morphology data of the actual machined parts. Second, the morphology characteristics of different scales are realized by the wavelet analysis and the power spectral density. Third, the reverse modeling engineering is used to construct the 3D contact models for the macroscopic characteristics. Finally, the finite element method is used to analyze the contact stiffness and the contact area of the 3D contact model.FindingsThe contact area and the nominal contact pressure Pn have a nonlinear relationship in the whole compression process for the 3D contact model. The percentage of the total contact area of the macro-scale mating surface is about 70 per cent when the contact pressure Pn is in the range of 0-100 MPa, and the elastic contact area accounts for the vast majority. Meanwhile, when the contact pressure Pn is less than 10MPa, the influence factor (the relative error of contact stiffness) is larger than 50 per cent, so the surface macro-scale morphology has a weakening effect on the normal contact stiffness of the mating surfaces.Originality/valueThis paper provides an effective method for the multi-scale separation of the surface morphology and then lays a certain theoretical foundation for improving the surface quality of parts and the morphology design.
Co-creation and co-destruction of service quality through customer-to-customer interactions
Authors: Luo Jiaqi (Gemma) , Wong IpKin Anthony , King Brian , Liu Matthew Tingchi , Huang GuoQiong 
Published: April 2019

Purpose
This study draws on the service-dominant (S-D) logic paradigm to examine value co-creation and co-destruction. As these phenomena are driven by positive and negative “customer-to-customer” (C2C) interactions, this paper aims to examine their influence on tourist perceptions of service quality and how they shape affective responses toward tourism and hospitality services and brand loyalty.

Design/methodology/approach
Following a comprehensive literature review, the authors used convenience sampling to gather a large sample of tourists at Shanghai Disneyland, a recently opened and already popular international tourism attraction. Structural equation modeling was used to test for direct and moderated relationships.

Findings
The findings indicated that positive and negative C2C interactions have significant though differential impacts on customer responses. Furthermore, it was found that visitor arousal mediated the relationship between service quality and brand loyalty. Prior experience was identified as a moderator in the co-creation and co-destruction process during service encounters.

Practical implications
This paper is one of the first to examine the concept of co-destruction in the tourism and hospitality context. It contributes to the literature by demonstrating the merits of proactive service provision by tourism operators, taking account of both the co-creation and co-destruction of value.

Originality/value
The study extends the literature by taking account of both positive and negative C2C interactions when examining co-creation and co-destruction in the context of service encounters. It also contributes to knowledge by assessing the asymmetry of such interactions in the context of the customer experience.
Testing for detection of crack in rotor using vibration analysis: an experimental approach
Authors: Shah Bhumi Ankit , Vakharia Dipak P. 
Published: April 2019

Purpose
Many incidents of rotor failures are reported due to the development and propagation of the crack. Condition monitoring is adopted for the identification of symptoms of the crack at very early stage in the rotating machinery. Identification requires a reliable and accurate vibration analysis technique for achieving the objective of the study. The purpose of this paper is to detect the crack in the rotating machinery by measuring vibration parameters at different measurement locations.

Design/methodology/approach
Two different types of cracks were simulated in these experiments. Experiments were conducted using healthy shaft, crack simulated shaft and glued shaft with and without added unbalance to observe the changes in vibration pattern, magnitude and phase. Deviation in vibration response allows the identification of crack and its location. Initial data were acquired in the form of time waveform. Run-up and coast-down measurements were taken to find the critical speed. The wavelet packet energy analysis technique was used to get better localization in time and frequency zone.

Findings
The presence of crack changes the dynamic behavior of the rotor. 1× and 2× harmonic components for steady-state test and critical speed for transient test are important parameters in condition monitoring to detect the crack. To separate the 1× and 2× harmonic component in the different wavelet packets, original signal is decomposed in nine levels. Wavelet packet energy analysis is carried out to find the intensity of the signal due to simulated crack.

Originality/value
Original signals obtained from the experiment test set up may contain noise component and dominant frequency components other than the crack. Wavelet packets contain the crack-related information that are identified and separated in this study. This technique develops the condition monitoring procedure more specific about the type of the fault and accurate due to the separation of specific fault features in different wavelet packets. From the experiment end results, it is found that there is significant rise in a 2× energy component due to crack in the shaft. The intensity of a 1× energy component depends upon the shaft crack and unbalance orientation angle.
Category-based or piecemeal-based processing? A dual model of web-mobile service extension behavior
Authors: Gong Xiang , Zhang Kem Z.K. , Chen Chongyang , Zhao Sesia J. , Lee Matthew K.O. 
Published: April 2019

PurposeThe advancements of mobile technologies and devices have greatly facilitated the extension of online services from web to mobile environments. Drawing on the categorization theory, the purpose of this paper is to explore the impact of perceived entitativity on users’ web-mobile service extension behavior. The research model considers how perceived entitativity serves as a category cue to link the category- and piecemeal-based processing and shape users’ adoption of extended mobile services.Design/methodology/approachAn online survey (n=552) was conducted to empirically test the model. The data were analyzed by structural equation modeling approach.FindingsThe results offer two major findings. First, performance expectancy, perceived controllability and subjective norm are important antecedents of users’ usage intention. Second, perceived entitativity has three types of effects on usage intention: it exerts a direct and positive influence on usage intention; it indirectly facilitates usage intention through increasing PE and perceived controllability; and it moderates the relationship between subjective norm and usage intention.Originality/valueThis study contributes to the literature by taking into account the interplay of category- and piecemeal-based processing to understand consumers’ web-mobile service extension behavior.
The influence of senior executive support informatization on radical innovation performance
Authors: Li Chao , Han Shuihua , Kumar Sameer , Feng Wei-Xi 
Published: April 2019

PurposeThe purpose of this paper is to define the conceptualization and measurement of informatization according to a capability perspective reflected in three aspects: IT managerial capability, IT-enabled capability and IT infrastructure capability.Design/methodology/approachManufacturing enterprises in China’s Northeast and Pearl River Delta regions in China were selected to empirically examine, using structural equation modeling, the association between a firm’s senior executive support informatization and radical innovation performance.FindingsResults show a significant positive relationship between senior executive support and IT-enabled capability. However, there are no significant positive influences uncovered between senior executive support and IT managerial capability and IT infrastructure capability. The authors find significant positive effects of IT managerial capability, IT-enabled capability and IT infrastructure capability on radical innovation performance. Lastly, the joint effect of senior executive support and external institutional environment has no significant influence on informatization.Originality/valueThis study offers improved understanding for enterprises and academia about the effect of senior executive support informatization on radical innovation performance. It also suggests taking effective measures to highlight the management level and enterprises’ radical innovation performance.
Complexity and performance measurement for retail supply chains
Authors: Ekinci Esra , Baykasoğlu Adil 
Published: April 2019

Purpose
The purpose of this paper is to present how complexity on retail supply chains should be recognized and its relationship with the performance. Different supply chain structures and planning horizons have been analyzed to support practitioners taking action on the short, mid and long terms. Confronted complexity in the supply chain has been categorized as system, perceived and value adding. This would also help practitioners to understand the sources of the complexity and if the complexity is useful for the system or not.

Design/methodology/approach
Three different retail supply chain scenarios – each concentrating on different planning horizons – have been simulated on system dynamics software STELLA. Using the new classification scheme for complexity and suggested performance metrics, a multi-perspective analysis has been performed on the STELLA output.

Findings
The results and the methodology can be easily applicable in practice to support decision-making process and to answer “what-if” type scenario analysis on systems design and configuration. Using the selected complexity metrics, complexity of the system considering time factor – static and dynamic – and different information levels – system, perceived and value adding – has been evaluated. Used complexity metrics indicate the problematic areas in the systems to be distinguished.

Originality/value
This paper uses system dynamics modeling in retail supply chains to derive insight about dynamic behavior and to represent the complex interactions and a new classification scheme for system complexity.
A regression spline control chart for monitoring characteristics exhibiting nonlinear profile over time
Authors: John Boby , Agarwal Vaibhav 
Published: April 2019

Purpose
The purpose of this paper is to demonstrate the application of the control chart procedure to monitor the characteristics whose profile over time resembles a set of connected line segments.

Design/methodology/approach
Fit a regression spline model by taking the subgroup average of the characteristic as response variable and time as the explanatory variable. Then monitor the response variable using the regression spline control chart with the fitted model as center line and upper and lower control limits at three standard deviation units of the response variable above and below the center line.

Findings
The proposed chart is successfully deployed to monitor the daily response time profile of a client server of an application support process. The chart ensured the stability of the process as well as detected the assignable cause leading to the slowing down of the server performance.

Practical implications
The methodology can be used to monitor any characteristics whose performance profile over time resembles a set of connected line segments. Some of the examples are the consumption profile of utility providers like power distribution companies, usage profiles of telecom networks, loading profile of airline check-in process, e-commerce websites, etc.

Originality/value
To the best of the author’s knowledge, construction of control charts using regression spline is new. The usage of the control chart to monitor the performance characteristics which exhibits a nonlinear profile over time is also rare.
Exploring the interrelationship between quality, safety and HR within crisis management framework
Authors: Nizamidou Christina , Vouzas Fotis , Gotzamani Katerina 
Published: April 2019

Purpose
The purpose of the paper is twofold: first, to examine the interaction of quality, safety and crisis management (CM), and second, to explore the role played by an HR department in terms of CM.

Design/methodology/approach
This paper consists of two parts: theoretical and empirical. The theoretical part follows the approach of an extended literature review. The empirical part illustrates the statistical analysis of the obtained data from Greek organizations that employ the largest number of employees, regardless of their business sector.

Findings
The statistical analysis allowed the authors to confirm their main research hypotheses. First, it showed the interrelationship that exists between safety, quality and CM. Second, it presented the impact of this relationship on human resources and the vital role of HR department, in case of a crisis.

Practical implications
Organizations and their top management can review and redesign their CM procedures according to the findings of this survey, aiming a fast recovery and a return to normalcy.

Originality/value
Based on the literature review, there has been a little research work on the interrelationship between safety, quality and the level of CM familiarity and the role of HR department at the times of crisis. The added value of attaining this goal may become a motivational element for any organization and its top management to continue investing more in safety, quality and CM issues.
Reproductive biology and genetic population structure of two alien Lolium species inhabiting the sandy coasts of Japan
Authors: Higuchi Yumiko , Shimono Yoshiko , Tominaga Tohru 
Published: April 2019

AbstractUnderstanding the characteristics of alien species is a prerequisite for any biological study or anti‐invasion management strategy. Lolium rigidum (Poaceae) is an alien species that has become naturalized on the sandy coasts of Japan; however, it exhibits extensive morphological variation, leading to speculation that several taxa of Lolium have become naturalized. Here, we compared the morphology, reproductive biology and genetic structure of this Lolium species by growing individuals from different locations in the same environment to clarify whether the observed morphological variation is genetically based or is caused by intraspecific variation as a result of environmental differences. Principle component analyses of 11 morphological traits separated the study species into two types. Bagging experiments showed that one type exhibited an outcrossing life history, whereas the other type selfed exclusively. Nuclear DNA microsatellite analyses supported this distinction between these morphological types, with no intermediate individuals being found. The outcrossing type exhibited high genetic diversity, whereas the selfing type exhibited almost no polymorphism, reflecting the differences in their breeding systems. Moreover, both types differed from the economically important outcrossing species Lolium multiflorum and Lolium perenne. These two types of Lolium are expected to have different introduction histories and invasive potential on the coasts of Japan. In conclusion, it is important to distinguish between these types through additional biological studies to design effective control measures.
An empirical model of carbon flow through marine viruses and microzooplankton grazers
Authors: Talmy David , Beckett Stephen J. , Taniguchi Darcy A. A. , Brussaard Corina P. D. , Weitz Joshua S. , Follows Michael J. 
Published: April 2019

SummaryViruses and microzooplankton grazers represent major sources of mortality for marine phytoplankton and bacteria, redirecting the flow of organic material throughout the world's oceans. Here, we investigate the use of nonlinear population models of interactions between phytoplankton, viruses and grazers as a means to quantitatively constrain the flow of carbon through marine microbial ecosystems. We augment population models with a synthesis of laboratory‐based estimates of prey, predator and viral life history traits that constrain transfer efficiencies. We then apply the model framework to estimate loss rates in the California Current Ecosystem (CCE). With our empirically parameterized model, we estimate that, of the total losses mediated by viruses and microzooplankton grazing at the focal CCE site, 22 ± 3%, 46 ± 27%, 3 ± 2% and 29 ± 20% were directed to grazers, sloppy feeding (as well as excretion and respiration), viruses and viral lysate respectively. We identify opportunities to leverage ecosystem models and conventional mortality assays to further constrain the quantitative rates of critical ecosystem processes.
Clinical application of the dried milk spot method for measuring tocilizumab concentrations in the breast milk of patients with rheumatoid arthritis
Authors: Saito Jumpei , Yakuwa Naho , Kaneko Kayoko , Nakajima Ken , Takai Chinatsu , Goto Mikako , Yamatani Akimasa , Murashima Atsuko 
Published: April 2019

AbstractAimsTocilizumab (TCZ), a humanized anti‐interleukin‐6 receptor monoclonal antibody, is used to treat rheumatic diseases. There is limited information about the administration of TCZ during lactation. The dried spot method, a simple technique for processing biological samples which involves placement of a drop of specimen onto filter paper, has been used in clinical pharmacology to determine various drug concentrations. This study examined the feasibility of sample collection using the dried milk spot (DMS) method for obtaining data about the transfer of TCZ into breast milk.MethodsConcentrations of TCZ determined using DMSs prepared by patients were compared with those using liquid breast milk.ResultsIn an enzyme‐linked immunosorbent assay of TCZ in DMSs, the accuracy ranged from 93.0% to 113.8% and the precision ranged from 0.3% to 8.4%. All concentrations of TCZ were within 15% of the reference value when analyzed on separate days. TCZ in DMSs at room temperature, 4°C, and −20°C were stable for 28 days. Extracted TCZ concentrations from patient‐prepared DMSs were strongly correlated with those of liquid samples (r = 0.996). In a pharmacokinetic study, the median (range) maximum and minimum concentrations were 113 ng/mL (68‐205) and 8.5 ng/mL (4.8‐13.4), respectively. The milk‐to‐serum ratio at the trough TCZ concentration of 3 lactating mothers were 0.0015, 0.00082 and 0.0014.ConclusionsThe DMS method for measuring TCZ transfer into breast milk may be reliable and feasible, and should contribute to evaluating the safety of breast‐fed infants whose mothers receive TCZ during lactation.
Nicotine‐induced neuroplasticity in striatum is subregion‐specific and reversed by motor training on the rotarod
Authors: Licheri Valentina , Eckernäs Daniel , Bergquist Filip , Ericson Mia , Adermark Louise 
Published: April 2019

AbstractNicotine is recognized as one of the most addictive drugs, which in part could be attributed to progressive neuroadaptations and rewiring of dorsal striatal circuits. Since motor‐skill learning produces neuroplasticity in the same circuits, we postulate that rotarod training could be sufficient to block nicotine‐induced rewiring and thereby prevent long‐lasting impairments of neuronal functioning. To test this hypothesis, Wistar rats were subjected to 15 days of treatment with either nicotine (0.36 mg/kg) or vehicle. After treatment, a subset of animals was trained on the rotarod. Ex vivo electrophysiology was performed 1 week after the nicotine treatment period and after up to 3 months of withdrawal to define neurophysiological transformations in circuits of the striatum and amygdala. Our data demonstrate that nicotine alters striatal neurotransmission in a distinct temporal and spatial sequence, where acute transformations are initiated in dorsomedial striatum (DMS) and nucleus accumbens (nAc) core. Following 3 months of withdrawal, synaptic plasticity in the form of endocannabinoid‐mediated long‐term depression (eCB‐LTD) is impaired in the dorsolateral striatum (DLS), and neurotransmission is altered in DLS, nAc shell, and the central nucleus of the amygdala (CeA). Training on the rotarod, performed after nicotine treatment, blocks neurophysiological transformations in striatal subregions, and prevents nicotine‐induced impairment of eCB‐LTD. These datasets suggest that nicotine‐induced rewiring of striatal circuits can be extinguished by other behaviors that induce neuroplasticity. It remains to be determined if motor‐skill training could be used to prevent escalating patterns of drug use in experienced users or facilitate the recovery from addiction.