GPU libraries speed performance analysis for RCWA simulation matrix operations

Rigorous Coupled Wave Analysis (RCWA) method is highly efficient for the simulation of diffraction efficiency and field distribution patterns in periodic structures and textured optoelectronic devices. GPU has been increasingly used in complex scientific problems such as climate simulation and the latest Covid-19 spread model. In this paper, we break down the RCWA simulation problem to key computational steps (eigensystem solution, matrix inversion/multiplication) and investigate speed performance provided by optimized linear algebra GPU libraries in comparison to multithreaded Intel MKL CPU library running on IRIDIS 5 supercomputer (1 NVIDIA v100 GPU and 40 Intel Xeon Gold 6138 cores CPU). Our work shows that GPU outperforms CPU significantly for all required steps. Eigensystem solution becomes 60% faster, Matrix inversion improves with size achieving 8x faster for large matrixes. Most significantly, matrix multiplication becomes 40x faster for small and 5x faster for large matrix sizes. © 2023 SPIE.

Emergencies in dental surgery during the COVID-19 pandemic

Introduction: Patients' negligence and difficult access to healthcare have an impact on the worsening of emergency conditions, which require immediate treatment due to the possibility of exacerbation in a short period of time. Untreated intra- and extraoral abscesses can have serious consequences on the patient's health and in many cases are life-threatening conditions increasing risk of respiratory obstruction, thrombophlebitis, meningitis, mediastinitis and septicemia. Background: The aim of this study is to investigate the impact of the pandemic and the resulting impediments to accessing medical care on the incidence and type of emergencies in the Oral Surgery Department. Material and methods: This was a retrospective study of 85375 patients aged 2 months to 90 years old with diagnosed intra- and extraoral abscesses before COVID-19 pandemic (2018,2019), and during pandemic (2020, 2021) in the Department of Oral Surgery of the Medical University in Lublin. The obtained results were statistically analyzed with the use of a computer program. Conclusions: The fewest patients were admitted in 2020, and the most in 2021, where we can already see the effects of the pandemic. Emergencies occurred most frequently in people aged 21-30, then 31-40. In 365 cases, tooth extraction was performed, and only in 28 cases, root canal treatment was attempted. Conclusions. Oral health service provision has been significantly affected by COVID-19. Patients came to their appointments too late, which in most cases resulted in the necessity of tooth extraction without attempting root canal treatment.

Enterprises' Green Growth Model and Value Chain Reconstruction: Theory and Method

The goal of this book is to improve the ability of enterprises to implement the green growth model and value chain reconstruction. China's environmental development strategies, such as carbon peak emission and carbon neutrality, have created new challenges and requirements for enterprises to "go green.” In addition, anti-globalization and the complex dynamic uncertainty caused by COVID-19 have changed the operational environment that enterprises face. The application of new technologies, including the new generation of information technologies and the whole process management technology, provides solutions for the implementation of enterprises' green growth model and value chain reconstruction. Based on China's enterprise management cases, this book reveals the connotative features of enterprises' green growth model and their evolutionary regularities, the overall framework and decision optimization of value chain reconstruction under the green growth model, and the approach to implementing the green growth model and value chain reconstruction. The theoretical framework of the green growth model and value chain reconstruction established in this book has enriched and developed the research results in this field. Cases of enterprises implementing the green growth model can provide references for the green transformation of enterprises and help enterprises appreciate the synergy between sustainability and growth. This book can also serve as a research reference for scholars engaged in the field of sustainable operations, as well as decision-makers and managers of relevant government departments. © The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2022.

Managing disruptions in the maritime industry – a systematic literature review

PurposeThis paper presents a systematic review of the literature in the domain of maritime disruption management, upon which future research framework and agenda are proposed. Two review questions, i.e. the measures that are employed to manage disruptions and how these contribute to resilience performance, were pursued.Design/methodology/approachThe systematic literature review procedure was strictly followed, including identification and planning, execution, selection and synthesis and analysis. A review protocol was developed, including scope, databases and criteria guiding the review. Following this, 47 articles were eventually extracted for the systematic review to identify themes for not only addressing the review questions but also highlighting future research opportunities.FindingsIt was found that earlier studies mainly focused on measures, which are designed using mathematical models, management frameworks and other technical support systems, to analyse and evaluate risks, and their impacts on maritime players at the levels of organisation, transport system and region in which the organisation is embedded. There is, however, a lack of research that empirically examines how these measures would contribute to enhancing the resilience performance of maritime firms and their organisational performance as a whole. Subsequently, a Digitally Embedded and Technically Support Maritime Disruption Management (DEST-MDM) model is proposed.Research limitations/implicationsThis review is constrained by studies recorded by the Web of Science only. Nevertheless, the proposed research model would expectedly contribute to enhancing knowledge building in the specific domain of maritime disruption management and supply chain management overall while providing meaningful managerial implications to policymakers and managers in the maritime industry.Originality/valueThis research is perhaps one of the first studies which presents a systematic review of literature in maritime disruption management and proposes a future research framework that establishes the link between disruption management and resilience and organisational performance for empirical validation.

Editorial: Post-COVID-19 global trade and business environment and maritime supply chain

Since January 2020, the COVID-19 pandemic has caused widespread impacts on virtually every sector of the global economy, including world trade and global supply chains. [...]it has been argued that the existing globalised economies might require to be restructured in the aftermath of the COVID-19 pandemic when governments and firms start to re-strategize their critical supply chains through various disruption and resilience management strategies. [...]other shipping intermediaries, i.e. freight forwarders and logistics service providers, who play crucial roles in connecting demand and supply of maritime supply chains also suffered due to reduced business transactions. [...]the focus of this special issue is on understanding the impact of the COVID-19 pandemic on various players in the maritime supply chain, as well as possible trends of global trade and maritime supply chains and strategies and policies in the aftermath of the pandemic.

Management and care of pregnant women in their third trimester with COVID-19 at Tangerang Hospital, Indonesia: a comprehensive approach

COVID-19 is a widespread contagious viral infection that can severely affect the respiratory system. Although many people recover from using the disease without special care or treatment, pregnant women are particularly vulnerable to pulmonary infections due to their hangers systems system and physiology. To investigate the treatment provided to pregnant women who are PCR-positive for COVID-19 in their early three months of pregnancy, a reanalyzed analyzed data from 84 participants who received treatment at Tangerang Regional Hospital in 2 study was the study conducted based on an ases of observational investigation with a cross-sectional approach. It assembled the data for analysis of the chi-square test. The results showed that 92.9% of participants underwent a cesarean section, while the remaining 7.1% were discharged after giving birth typically or recovering. Additionally, the study did not find any correlation between factors such as age, education, work, gravida, ANC visit, and the impact of COVID-19 on the third trimester of pregnancy at Tangerang Hospital in 2022. The study recommends that pregnant women seek information about pregnancy care from healthcare providers, particularly midwives, posyandu officers, and the media, to make well-known decisions about their health and well-being during this critical period, ensuring a safe and healthy pregnancy outcome.

Modelling of factors influencing organizational readiness for change in start-ups during the COVID-19 emergency

PurposeThe purpose of this paper is to "identify”, "analyze” and "construct” a framework to quantify the relationships between several determinants of organizational preparedness for change in the start-ups during the COVID-19 emergencies.Design/methodology/approachTotal interpretive structural modelling (TISM) is used to find characteristics that assist in analyzing the readiness or preparedness level before initiating a change deployment process in start-ups. A cross-impact matrix multiplication applied to classification (MICMAC) analysis is performed to determine the driving and dependent elements of change in start-ups.FindingsFrom literature research and an expert interview, this study selected ten variables of change preparedness to explore inner interconnections and comprehend the inner connections factors. The findings depict that clarity of mission and goals, reward system, technological advancement and motivational readiness have been considered the most important readiness factor for deploying organizational change in start-ups during the COVID-19 emergencies.Practical implicationsThis research will aid the management and researchers gain a better understanding of the factors that influence change preparedness. Constant observation of current changes in the start-ups and the external environment will aid in improving the quality of products or services provided by the start-ups during the COVID-19. The start-ups can use these criteria linked to change readiness. The priority of each element is determined using MICMAC analysis and ranking using the TISM technique, which assists start-ups in ordering the enablers from highest to lowest priority.Originality/valueThere is no research regarding factors influencing organizational readiness for change in start-ups during the COVID-19 emergencies. This research gap is filled by analyzing aspects linked to organizational readiness for change in start-ups. This gap inspired the present study, which uses the "Total Interpretive Structural Modelling (TISM)” technique to uncover change determinants and investigate hierarchical interconnections among factors influencing organizational readiness to change in start-ups during the COVID-19 emergencies.

REDUCED TRANSMISSION RISKS FOR PASSENGER OPERATIONS DURING COVID-19 PANDEMIC

In the aircraft cabin, passengers must share a confined environment with other passengers during boarding, flight, and disembarkation, which poses a risk for virus transmission and requires risk-appropriate mitigation strategies. Spacing between passenger groups during boarding and disembarkation reduces the risk of transmission, and optimized sequencing of passenger groups helps to significantly reduce boarding and disembarkation time. We considered passenger groups to be an important factor in overall operational efficiency. The basic idea of our concept is that the members of a group should not be separated, since they were already traveling as a group before entering the aircraft. However, to comply with COVID-19 regulations, different passenger groups should be separated spatially. For the particular challenge of disembarkation, we assume that passenger groups will be informed directly when they are allowed to leave for disembarkation. Today, cabin lighting could be used for this information process, but in a future digitally connected cabin, passengers could be informed directly via their personal devices. These devices could also be used to check the required distances between passengers. The implementation of optimized group sequencing has the potential to significantly reduce boarding and disembarkation times, taking into account COVID-19 constraints. © 2022 ICAS. All Rights Reserved.

Multi-criteria Decision-making Algorithm Based on Linear Diophantine Fuzzy Aggregation Operators

Due to lack of relevant information in many real-life circumstances, it is not acceptable for experts to exactly quantify their judgments with a crisp number. We investigate the aggregation approaches for "lin-ear Diophantine fuzzy numbers" (LDFNs) using Frank operations. We first extend the Frank t-conorm and t-norm (FTcTn) to linear Diophan-tine fuzzy environments and offer numerous new LDFN operations, we develop several new linear Diophantine fuzzy aggregation opera-tors (AOs), including the "linear Diophantine fuzzy Frank weighted averaging (LDFFWA) operator and the linear Diophantine fuzzy Frank weighted geometric (LDFFWG) operator". We also exhibit several properties of these AOs and investigate their relationships. The FTcTn has two major benefits. They work similarly to algebraic, Hamacher and Einstein t-conorms and t-norms (TcTn). Second, they include a feature that leads to a more adaptive and accurate aggregation pro-cess, making them more successful than other broad TcTn techniques. We also employ these operators to provide a strategy for dealing with "multi-criteria decision-making" (MCDM) with LDFNs. Furthermore, using the suggested AOs, a quantitative test case of the new carnivo-rous (NCOVID19) issue is presented as an implementation for expedi-ent decision-making. The goal of this numerical model is to illustrate the usefulness and feasibility of the AOs provided.

A comprehensive overview on COVID-associated mucormycosis

In recent times, numerous reports of systemic fungal infections have been a major concern. The angioinvasive fungal infection, mucormycosis has surged in patients with COVID-19 due to various factors, mainly uncontrolled diabetes and inappropriate corticosteroid use. The prevalence of this acute and fatal fungal infection caused by Mucorales-related fungal species has been highest in the Indian population. COVID-associated mucormycosis (CAM) has a propensity for contiguous spread, and exhibits high morbidity as well as mortality. Unless promptly detected and treated, it is associated with a poor prognosis. A high index of suspicion, aggressive surgical debridement and use of systemic antifungal agents continue to be the standard of care for CAM. Moreover, there is an imperative need to address this public health issue by increasing public awareness and education. This article provides a comprehensive overview on the emergence of CAM during the pandemic, the current burden, pathophysiology, diagnostic interventions and management of CAM in Indian clinical practice.

Empirical investigation into impact of IT adoption on supply chain agility in fast food sector in Pakistan

Information technology and supply chain agility are in vogue. The present study aims to investigate the impact of information technology (IT) on supply chain agility and its outcomes such as cost reduction and operational performance in fast food companies' chains. A total of 240 employees from fast food chains were selected as respondents. Data was collected using five-point Likert scale questionnaire developed from previous studies. The statistical results confirmed that adoption of IT is playing a vibrant role in achieving supply chain agility and supply chain agility helps to reduce cost and improves operational performance of firms. The study model provides a useful framework to examine the impact of IT adoption on supply chain agility and its outcomes. In conclusion, the firms have to focus on their supply chain management and make it efficient and agile by implementing the advanced technologies to gain operational performance. Implications have been discussed.

Collaboration in humanitarian operations in the context of the COVID-19 pandemic

This chapter provides an overview of collaboration in humanitarian operations, focusing on the logistical aspects. Humanitarian logistics and operations has emerged as a subfield of supply chain and operations management and studies how humanitarian organizations can be more efficient in the delivery of humanitarian aid. We review the key characteristics of this subfield compared to traditional logistics and supply chain management. Collaboration is particularly important in the humanitarian context, in which only the collective performance of humanitarian organizations should count. We therefore discuss key factors of collaboration using the humanitarian SCOR model. Finally, we analyze how far the COVID-19 pandemic has forced humanitarian organizations to collaborate differently in their operations and what can be learned from it for the future of humanitarian operations. © Springer Nature Switzerland AG 2023. All rights reserved.

The Verification & Validation of the Mars 2020 Perseverance Rover Surface Mission Operations System

Leading up to its landing on Mars on February 18, 2021, the Mars 2020 Perseverance rover Surface Mission Operations System (MOS) underwent a verification and validation (V&V) campaign consisting of a series of Super Thread Tests and Operational Readiness Tests. This V&V campaign emphasized incremental testing, mission scenario and capability coverage, and the Test-As-You-Fly approach wherever possible. Although the elements that comprise the Surface System underwent their own internal V&V campaigns, the system-level tests were vital in uncovering findings observable only through the integrated and flight-like nature of these Surface Mission Operations System V & V tests. The COVID-19 pandemic posed additional challenges, including limited facility access, constrained in-person activities, changes to operations paradigms, and evolving safety protocols in the midst of the testing campaign and preparation for surface operations. This paper describes the Verification and Validation campaign of the Mars 2020 Perseverance Rover Surface Mission Operations System that led to the readiness for rover operations on Mars. © 2023 IEEE.

Visualising the Optimistic, Realistic, and Pessimistic Financial Distress Outlooks for Airport Operations in Malaysia

This paper aims to visualise three financial distress outlooks using computer simulations. The financial distress exposure for airport operations in Malaysia between 1991 and 2021 is given by Altman Z”-score and modelled by the multivariate generalized linear model (MGLM). Seven determinants contributing to the financial distress from literature are examined. The determinant series are fitted individually by using linear model with time series components and autoregressive integrated moving average models to forecast values for the next 10 financial years. Future short- to long-term memory effects following COVID-19 are apparent in time series plots. In the simulations, the MGLM procedure utilised Gaussian, gamma, and Cauchy probability distributions associated with expectations and challenges of doing business as well as uncertainties in the economy. The underlying trends of realistic, optimistic, and pessimistic financial distress outlooks insinuate that the increasing risk of financial distress of airport operations in Malaysia is expected to continue for the next decade.

China's Perceptions of Russia during the Ukraine Conflict

The ongoing Russian military operation in Ukraine since February 2022 has presented significant challenges to China's foreign and security policies, as well as its economic and technological ties with the West. Initially, China refrained from criticizing Russia's military actions and adopted a "neutral" or "independent" stance in response to Western criticism. However, China was taken aback by the protracted nature of the conflict and Russia's inability to successfully conclude its military operation. This raised concerns within China, considering its own situation of potentially reunifying with Taiwan through military means if necessary. While there are distinctions between the situations in Ukraine and Taiwan, the initial speculation of China conducting military operations against Taiwan has gradually diminished, although military pressure on Taiwan remains. The conflict in Ukraine has also caused internal divisions within China and has had an impact on its relations with the West, which are crucial for China's rise on the global stage. This article aims to examine China's interests and positions regarding the ongoing Ukrainian conflict, the implications for its relations with Russia, and the opportunities and challenges that China faces in the current situation. The article employs an inductive approach, analyzing China's predicaments at four levels: perceptions within the decision-making bodies of the Communist Party, the foreign ministry, think-tanks, and the media community. It argues that in conjunction with China's economic contraction resulting from the COVID-19 pandemic, the Russian military operation has prompted China to seriously contemplate how to safeguard its national interests, particularly with regard to Taiwan and its strategic objectives of attaining a prominent global position. These considerations carry medium to long-term implications for the evolving regional and global orders. In conclusion, the article briefly discusses the implications of these developments on India, shedding light on the broader regional dynamics influenced by China's response to the Ukrainian conflict. © 2023, MGIMO Universty Press. All rights reserved.

Leaving Without Being Seen from the Pediatric Emergency Department: A New Baseline

BACKGROUND Left without being seen (LWBS) rates are an important quality metric for pediatric emergency departments (ED), with high acuity LWBS children representing a patient safety risk. Since 07/2021, our ED experienced a surge in LWBS after the most stringent COVID-19 quarantine restrictions ended. OBJECTIVES We assessed changes in LWBS rates and examined associations of system factors and patient characteristics with LWBS. METHODS We performed a retrospective study in a large, urban pediatric ED, for all arriving patients, comparing three time-periods: before COVID (PRE, 01/2018 – 02/2020), during early-COVID (COVID, 03/2020 – 06/2021), and after the emergence of COVID-19 variants and reemergence of seasonal viruses (POST, 07/2021 – 12/2021). We compared descriptive statistics of daily LWBS rates, patient demographics, and system characteristics. Negative binomial (system factors) and logistic regression (patient characteristics) models were developed to evaluate the associations between system factors and LWBS, and patient characteristics and LWBS, respectively. RESULTS Mean daily LWBS rates changed from 1.8% PRE to 1.4% COVID to 10.7% during POST. Rates increased across every patient demographic and triage level during POST, despite a decrease in daily ED volume compared to PRE. LWBS rates were significantly associated with ESI 2 patients, average ED census, and staff productivity within multiple periods. Patient characteristics associated with LWBS included lower assigned triage levels and arrival between 8PM and 4AM. CONCLUSIONS LWBS rates have shown a large and sustained increase since July 2021, even for high acuity patients. We identified system factors that may provide opportunities to reduce LWBS. Further work should develop strategies to prevent LWBS in at-risk patients.

Revisiting the marketing approach between seaports and dry ports in Malaysia: current trend and strategy for improvement

Purpose This paper aims to explore the comparative analysis of marketing strategies between seaports and dry ports. Second, this paper proposes a recommendation to improve marketing approaches in both nodes.Design/methodology/approach This research analyzes current marketing approaches to improve the freight volume and enhance interrelation between them for a comprehensive collaboration in the freight supply chain. This research employed semi-structured interviews via an e-interview questionnaire.Findings The result shows that dry port and seaport practice a mixed marketing strategy. Some marketing elements that a seaport applies are also applied by a dry port, like focusing on the target customer, joining exhibitions and face-to-face meetings. Customized service to clients, frequent discussion on the effective marketing plans and increasing the facilities at the seaport and dry ports can improve the marketing strategies in dry port and seaports.Originality/value Seaports are the critical components in esteem-driven context, which add to supply chains by creating value-added services in the transport chain. Nonetheless, research between dry ports and seaports has increasingly drawn the attention of scholars during the last decade. Having said like that, there have not been any pragmatic studies undertaken in the Malaysian context that mainly discusses the marketing prospect of the dry ports and seaports especially during COVID-19 outbreak.

Development and Current Situation of Forest Use by Camping Sites in Japan

After the Second World War, camping and camping sites in forests have developed and increased significantly from the 1980 s to 1990 s in Japan, relying on the laws and institutions established from the 1950 s to 1970 s across multiple administrative sectors, obtaining social approval as a legitimatized outdoor activity and forest use. Since the 2000s, the management of these camping sites has deteriorated mainly owing to economic recession, which caused the movement of camping site renewal by the private sector. This movement directed the diversification of forest use by camping sites in recent years. Camping facilities have been developed in many ways to meet the needs of campers, including organized group camps that promote education and experience in forests, solo camps, glamping, and workcations under the spread of the COVID-19 that demand relaxing or productive environment, and leisure camps that require enrichment of outdoor activities. As a result of this diversification, possibilities for effective utilization of forests and regional revitalization through the management of camping sites have been observed. Many camping sites have utilized forest lands, standing trees, and forest spaces to develop facilities and services, and there are cases where firewood production for campers has promoted the reorganization and development of local forestry and securing of personnel for forest management. In addition to securing local employment brought by reorganization, local revitalization in rural and mountainous areas has been promoted through the linkage of the needs of campers to positive economic effects, increase of the visitors who deeply connected to local people, and comprehensive and sustainable use of resources in local societies. © 2023 Nihon Ringakkai. All rights reserved.

An Operations Research-Based Teaching Unit for Grade 10: The ROAR Experience, Part I

We introduce "Ricerca Operativa Applicazioni Reali" (ROAR;in English, "Real Applications of Operations Research"), a three-year project for higher secondary schools. Its main aim is to improve students' interest, motivation, and skills related to Science, Technology, Engineering, and Mathematics disciplines by integrating mathematics and computer science through operations research. ROAR offers examples and problems closely connected with students' everyday life or with the industrial reality, balancing mathematical modeling and algorithmics. The project is composed of three teaching units, addressed to grades 10, 11, and 12. The implementation of the first teaching unit took place in Spring 2021 at the scientific high school IIS Antonietti in Iseo (Brescia, Italy). In particular, in this paper, we provide a full description of this first teaching unit in terms of objectives, prerequisites, topics and methods, organization of the lectures, and digital technologies used. Moreover, we analyze the feedback received from students and teachers involved in the experimentation, and we discuss advantages and disadvantages related to distance learning that we had to adopt because of the COVID-19 pandemic.

Covid-19 and its impact on nursing care facility business operations: A phenomenological inquiry

The research problem was the lack of knowledge regarding how nursing care facility leaders sustained business operations within the climate of adversity created by the COVID-19 pandemic. The purpose was to explore and understand the essence of nursing care facility leaders' perceptions and experiences in maintaining business operations during the COVID-19 pandemic. The conceptual framework was based on resiliency theory. The central research question and subquestion for this qualitative transcendental, phenomenological study focused on what strategies nursing care facility leaders use to sustain business operations during the COVID-19 pandemic, as well as their perceptions and experiences regarding their response to the pandemic A purposive sample of 10 nursing care administrators in North Carolina participated in semi-structured interviews. The modified Van Kaam method of data analysis was also utilized to create a textural-structural description of the participants' lived experiences, and three themes were revealed. The participants experienced challenges in all areas of business resilience in nursing care facilities, developed diverse strategies to maintain each type of business resilience in response to the pandemic, and perceived that these strategies resulted in improved organizational resilience. The study's findings can promote positive social change by helping other managers and administrators understand and improve organizational resilience in future crises. Managers and administrators at other healthcare organizations can use insights from this study to support disaster planning and management efforts, which benefit society through improved healthcare outcomes resulting from increased strength and resilience. (PsycInfo Database Record (c) 2023 APA, all rights reserved)