Are Neutral Sentiments Worth Considering When Investigating Online Consumer Reviews? Their Relationship with Review Ratings

Online consumer reviews (OCRs) play an important role for firms to understand consumer satisfaction. Prior research on OCRs has used sentiment analysis to identify and quantify consumers’ subjective impressions in terms of positive and negative sentiments. However, OCRs also contain objective facts about the product or service, which are represented by neutral sentiments. In this study, we argue that it is important to distinguish neutral sentiments from those of positivity and negativity when investigating consumer satisfaction. Through a lens of expectation-confirmation theory, we delineate the roles of subjective information in relation to consumer satisfaction, in the sense that consumer satisfaction is mainly formed by one’s subjective expectations and evaluations, not by objective facts of the product or service. The empirical results obtained from OCRs about hotels demonstrate that consumer satisfaction is significantly higher in positive OCRs than neutral ones, and significant lower in negative OCRs than neutral ones. Furthermore, neutral sentiments drastically improve the explanatory power of empirical models, thereby enhancing our understanding of consumer satisfaction. Academically, this study sheds light on the importance of neutral sentiments. Practically, neutral sentiments, when being separated from the other two sentiment categories, contribute to more accurately reflecting consumer satisfaction

Developing an adaptive protection scheme towards promoting the deployment of distributed renewable sources in modern distribution networks: operational simulation phase.

The large-scale integration of renewables into the electricity grid as distributed generation sources for providing clean energy supply together with the recent introduction of the smart grid concept, have accelerated the need to modernize the existing protection schemes to accommodate the challenges originated from distributed generation. This paper presents an adaptive protection scheme that has been developed to allow automatic adjustment of optimal relay settings in response to multiple network topologies and unexpected variations arising from renewable energy systems integration towards promoting their deployment in modern distribution networks. A Simulink model is developed to simulate the operation of the adaptive protection scheme, being interlinked to a linear-programming technique to allow optimizing the relay settings in response to dynamic changes of network topology associated with the integration of distributed generation sources. The performance of the developed adaptive protection scheme in accommodating the dynamic changes of network topology has been assessed under two proposed network topologies using a small-scale network that has been built in the lab as part of experimental work for the purpose of implementing the adaptive control unit. Results have demonstrated the effectiveness of the developed approach in optimizing the relay settings in response to the subjected topology changes, achieving minimum relay trip times while ensuring a suitable relay coordination is satisfied in each of the tested network topologies

Assessment methods in laparoscopic colorectal surgery:a systematic review of available instruments

Background: Laparoscopic surgery has become the golden standard for many procedures, requiring new skills and training methods. The aim of this review is to appraise literature on assessment methods for laparoscopic colorectal procedures and quantify these methods for implementation in surgical training. Materials and methods: PubMed, Embase and Cochrane Central Register of Controlled Trials databases were searched in October 2022 for studies reporting learning and assessment methods for laparoscopic colorectal surgery. Quality was scored using the Downs and Black checklist. Included articles were categorized in procedure-based assessment methods and non-procedure-based assessment methods. A second distinction was made between capability for formative and/or summative assessment. Results: In this systematic review, nineteen studies were included. These studies showed large heterogeneity despite categorization. Median quality score was 15 (range 0–26). Fourteen studies were categorized as procedure-based assessment methods (PBA), and five as non-procedure-based assessment methods. Three studies were applicable for summative assessment. Conclusions: The results show a considerable diversity in assessment methods with varying quality and suitability. To prevent a sprawl of assessment methods, we argue for selection and development of available high-quality assessment methods. A procedure-based structure combined with an objective assessment scale and possibility for summative assessment should be cornerstones.</p

An Instrumental Case Study of Confirmative Evaluation in the Continuous Improvement of Online Remote Leaders’ Work

Confirmative evaluation is often noted as an important element of models of Human Performance Technology and Performance Improvement, but there exists confusion around what is and what is not confirmative evaluation. A significant issue limiting the use of confirmative evaluation is the Performance Improvement field’s inability to clearly classify confirmative evaluation in terms of its purpose and scope. Additionally, the performance improvement field lacks sufficient examples of confirmative evaluation in the literature necessary to adequately define confirmative evaluation and demonstrate its use. Without sufficient examples of confirmative evaluation, practitioners of performance improvement are left without a clear path of how to conduct confirmative evaluation in ways that are contextually relevant and cost effective. Additionally, those who train instructional designers and performance improvement practitioners lack the tools necessary to help students of the field learn about and use this vital aspect of evaluation. Through the conceptual framework of systems theory and change management, this instrumental case study reviewed the literature around confirmative evaluation to identify the confusion around confirmative evaluation and then presented a case of confirmative evaluation applied in a context of change management and continuous improvement in online higher education. This case used job descriptions of remote leaders’ work to determine the degree to which an organizational restructuring had been implemented as it had been intended and had influenced remote leaders’ actual work. Time study methodology and matrix sampling were employed to observe remote leaders’ work. The data from the time study was compared against remote leaders’ job descriptions and institutional surveys gauging satisfaction among those served by these remote leaders. The difference between the expected work and the observed work demonstrated the degree to which remote leaders had embraced the new duties given to them in the organizational restructuring and identified key gaps in their collective performance. Together, this instrumental case study demonstrated that confirmative evaluation plays a linking or bridging role in continuous improvement processes by moving the process from summative evaluation to a new phase of formative evaluation. The study then examined the results of the case to consider how it clarified the field’s understanding of confirmative evaluation. Key findings included the recognition that confirmative evaluation is distinct from other forms of evaluation because of its purpose and that purpose and timing are intertwined and inform one another in evaluation efforts. It also identified where confirmative evaluation fits within and can improve performance improvement and change management models. The study ended with a discussion of challenges faced when conducting confirmative evaluation and implications for future studies of confirmative evaluation

A comparative study of smart THD-based fault protection techniques for distribution networks

The integration of Distributed Generators (DGs) into distribution systems (DSs) leads to more reliable and efficient power delivery for customers. However, the possibility of bi-directional power flow creates new technical problems for protection schemes. This poses a threat to conventional strategies because the relay settings have to be adjusted depending on the network topology and operational mode. As a solution, it is important to develop novel fault protection techniques to ensure reliable protection and avoid unnecessary tripping. In this regard, Total Harmonic Distortion (THD) can be used as a key parameter for evaluating the grid’s waveform quality during fault events. This paper presents a comparison between two DS protection strategies that employ THD levels, estimated amplitude voltages, and zero-sequence components as instantaneous indicators during the faults that function as a kind of fault sensor to detect, identify, and isolate faults. The first method uses a Multiple Second Order Generalized Integrator (MSOGI) to obtain the estimated variables, whereas the second method uses a single SOGI for the same purpose (SOGI-THD). Both methods rely on communication lines between protective devices (PDs) to facilitate coordinated protection. The effectiveness of these methods is assessed by using simulations in MATLAB/Simulink considering various factors such as different types of faults and DG penetrations, different fault resistances and fault locations in the proposed network. Moreover, the performance of these methods is compared with conventional overcurrent and differential protections. The results show that the SOGI-THD method is highly effective in detecting and isolating faults with a time interval of 6–8.5 ms using only three SOGIs while requiring only 447 processor cycles for execution. In comparison to other protection methods, the SOGI-THD method exhibits a faster response time and a lower computational burden. Furthermore, the SOGI-THD method is robust to harmonic distortion, as it considers pre-existing harmonic content before the fault and avoids interference with the fault detection process.Peer ReviewedPostprint (published version

Photoacoustic Elastography and Next-generation Photoacoustic Tomography Techniques Towards Clinical Translation

Ultrasonically probing optical absorption, photoacoustic tomography (PAT) combines rich optical contrast with high ultrasonic resolution at depths beyond the optical diffusion limit. With consistent optical absorption contrast at different scales and highly scalable spatial resolution and penetration depth, PAT holds great promise as an important tool for both fundamental research and clinical application. Despite tremendous progress, PAT still encounters certain limitations that prevent it from becoming readily adopted in the clinical settings. This dissertation aims to advance both the technical development and application of PAT towards its clinical translation. The first part of this dissertation describes the development of photoacoustic elastography techniques, which complement PAT with the capability to image the elastic properties of biological tissue and detect pathological conditions associated with its alterations. First, I demonstrated vascular-elastic PAT (VE-PAT), capable of quantifying blood vessel compliance changes due to thrombosis and occlusions. Then, I developed photoacoustic elastography to noninvasively map the elasticity distribution in biological tissue. Third, I further enhanced its performance by combing conventional photoacoustic elastography with a stress sensor having known stress–strain behavior to achieve quantitative photoacoustic elastography (QPAE). QPAE can quantify the Young’s modulus of biological tissues on an absolute scale. The second part of this dissertation introduces technical improvements of photoacoustic microscopy (PAM). First, by employing near-infrared (NIR) light for illumination, a greater imaging depth and finer lateral resolution were achieved by near-infrared optical-resolution PAM (NIR-OR-PAM). In addition, NIR-OR-PAM was capable of imaging other tissue components, including lipid and melanin. Second, I upgraded a high-speed functional OR-PAM (HF-OR-PAM) system and applied it to image neurovascular coupling during epileptic seizure propagation in mouse brains in vivo with high spatio-temporal resolution. Last, I developed a single-cell metabolic PAM (SCM-PAM) system, which improves the current single-cell oxygen consumption rate (OCR) measurement throughput from ~30 cells over 15 minutes to ~3000 cells over 15 minutes. This throughput enhancement of two orders of magnitude achieves modeling of single-cell OCR distribution with a statistically meaningful cell count. SCM-PAM enables imaging of intratumoral metabolic heterogeneity with single-cell resolution. The third part of this dissertation introduces the application of linear-array-based PAT (LA-PAT) in label-free high-throughput imaging of melanoma circulating tumor cells (CTCs) in patients in vivo. Taking advantage of the strong optical absorption of melanin and the unique capability of PAT to image optical absorption, with 100% relative sensitivity, at depths with high ultrasonic spatial resolution, LA-PAT is inherently suitable for melanoma CTC imaging. First, with a center ultrasonic frequency of 21 MHz, the LA-PAT system was able to detect melanoma CTCs clusters and quantify their sizes based on the contrast-to-noise ratio (CNR). Second, I developed an LA-PAT system with a center ultrasonic frequency of 40 MHz and imaged melanoma CTCs in patients in vivo with a CNR greater than 12. We successfully imaged 16 melanoma patients and detected melanoma CTCs in 3 of them. Among the CTC-positive patients, 67% had disease progression despite systemic therapy. In contrast, only 23% of the CTC-negative patients showed disease progression. This study lays a solid foundation for translating CTC detection to bedside for clinical care and decision-making

How can surgical skills in laparoscopic colon surgery be objectively assessed?—a scoping review

BACKGROUND: In laparoscopic colorectal surgery, higher technical skills have been associated with improved patient outcome. With the growing interest in laparoscopic techniques, pressure on surgeons and certifying bodies is mounting to ensure that operative procedures are performed safely and efficiently. The aim of the present review was to comprehensively identify tools for skill assessment in laparoscopic colon surgery and to assess their validity as reported in the literature. METHODS: A systematic search was conducted in EMBASE and PubMed/MEDLINE in May 2021 to identify studies examining technical skills assessment tools in laparoscopic colon surgery. Available information on validity evidence (content, response process, internal structure, relation to other variables, and consequences) was evaluated for all included tools. RESULTS: Fourteen assessment tools were identified, of which most were procedure-specific and video-based. Most tools reported moderate validity evidence. Commonly not reported were rater training, assessment correlation with variables other than training level, and validity reproducibility and reliability in external educational settings. CONCLUSION: The results of this review show that several tools are available for evaluation of laparoscopic colon cancer surgery, but few authors present substantial validity for tool development and use. As we move towards the implementation of new techniques in laparoscopic colon surgery, it is imperative to establish validity before surgical skill assessment tools can be applied to new procedures and settings. Therefore, future studies ought to examine different aspects of tool validity, especially correlation with other variables, such as patient morbidity and pathological reports, which impact patient survival. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s00464-021-08914-z

Investigating benefits realisation process for enterprise resource planning systems

This research aims to investigate the benefit realisation process for ERP systems so as to develop a benefit realization road map whereby organisations can realize the maximum potential of their ERP systems. This research covers two areas: mechanism of implementation and the destination to change (i.e. road map). It has been found that project management and benefits management approaches are necessary for recouping benefits from investing in Information Technologies (IT) projects. Thus, Project Benefits Governance Framework (PBGF) is developed, and later tested, by combining the two approaches for the sake of realising the expected benefits from investing in IT initiatives. Because ERP demands radical changes in organisations, the neo-institutionalisation theory was adopted to apply PBGF on ERP so that the ERP success is improved. The key connecting element between PM and BM in PGBF is the blueprint design. ERP orchestration framework is developed to show how investments in ERP resources and organisational complementary resources shall be orchestrated so that ERP benefits can be realised effectively. Thus, benefits are classified into three levels (automating, planning, and innovating benefits), and each level needs a specific blueprint. All of these blueprints constitute the ERP benefits road map. Each blueprint consists of attitudes, skills, organisation characteristics, technologies, and ERP department human resources competencies. Based on these results, ERP Business Innovation framework is developed and tested. ERP benefits maturity assessment tool is developed for assessing organisations’ status to show weaknesses and strengths in their ability to recoup different ERP benefits by benchmarking with the three blueprints. This research has contributed by integrating and institutionalising benefits management practices and project management practices. Moreover, it is novel in adapting the orchestration theory to understand how ERP resources shall be composed to achieve benefits efficiently. Finally, it demonstrates that ERP can be a source of innovation if the innovating benefits are managed deliberately

AIAP: A quality control and integrative analysis package to improve ATAC-seq data analysis

Assay for transposase-accessible chromatin with high-throughput sequencing (ATAC-seq) is a technique widely used to investigate genome-wide chromatin accessibility. The recently published Omni-ATAC-seq protocol substantially improves the signal/noise ratio and reduces the input cell number. High-quality data are critical to ensure accurate analysis. Several tools have been developed for assessing sequencing quality and insertion size distribution for ATAC-seq data; however, key quality control (QC) metrics have not yet been established to accurately determine the quality of ATAC-seq data. Here, we optimized the analysis strategy for ATAC-seq and defined a series of QC metrics for ATAC-seq data, including reads under peak ratio (RUPr), background (BG), promoter enrichment (ProEn), subsampling enrichment (SubEn), and other measurements. We incorporated these QC tests into our recently developed ATAC-seq Integrative Analysis Package (AIAP) to provide a complete ATAC-seq analysis system, including quality assurance, improved peak calling, and downstream differential analysis. We demonstrated a significant improvement of sensitivity (20%-60%) in both peak calling and differential analysis by processing paired-end ATAC-seq datasets using AIAP. AIAP is compiled into Docker/Singularity, and it can be executed by one command line to generate a comprehensive QC report. We used ENCODE ATAC-seq data to benchmark and generate QC recommendations, and developed qATACViewer for the user-friendly interaction with the QC report. The software, source code, and documentation of AIAP are freely available at https://github.com/Zhang-lab/ATAC-seq_QC_analysis