The rectangular two-dimensional strip packing problem real-life practical constraints: A bibliometric overview

New and improved level heuristics for the rectangular strip packing and variable-sized bin packing problems

Systematic Reviews of the Literature: So What? Why Bother? Who Cares

The COVID-19 pandemic is particularly severe in older adults. Our objective was to identify, from international literature, the most common symptoms met in older adults infected with the SARS-CoV-2 virus. This systematic review of the literature was conducted using MEDLINE from December 1, 2019 to April 13, 2020. The analysis of methodological quality used a method dedicated to case series and case reports. Out of 260 articles initially identified, only two studies were finally included in the qualitative analysis. The mean age was relatively low, between 71 and 74 years on average. The symptoms of COVID-19 were as follows: fever, dry cough, dyspnea, asthenia, anorexia, chest tightness, diarrhea, and to a lesser extent myalgia, pharyngitis, nausea, dizziness, headache, abdominal pain and finally vomiting. Lymphopenia was found in the complete blood count. In conclusion, this systematic review of the international literature reveals a lack of data about the semiology of COVID-19 in older adults, especially in the frail oldest-old ones who commonly define the geriatric population. The national survey conducted by the French Society of Geriatrics and Gerontology will help fill this semiological gap.

Organizations have long struggled with appropriate interventions to mitigate knowledge worker turnover. Because of their unique skills, knowledge workers have a considerably higher rate of turnover than traditional workers, and they are expensive to replace. Organizations use performance appraisal systems to identify and retain critical employees. Knowledge workers enable organizations to remain creative and innovative as well as maintain their competitive edge. The purpose of this study was to use systematic review of extant literature to show how organizations can effectively use performance appraisal systems to improve the retention of knowledge workers. This was done by gathering evidence on performance appraisal systems and knowledge workers from various databases and conducting a rigorous synthesis of available evidence. The efficacy of appraisal systems in mitigating knowledge worker churn was viewed through the lens of expectancy theory and a conceptual framework was developed. Expectancy theory focuses on an individual’s belief that they can obtain desired outcomes if they exert certain effort. Knowledge workers want to be challenged and evaluated based on objective criteria. A thematic analysis of the evidence revealed important themes for management practice: identify and segment knowledge workers, ensure a positive perception of the appraisal system via ‘voice’ inclusion, and deploy competent job evaluators for accurate performance evaluation. This is the first known systematic review of the literature which focuses on the competence of the appraiser as an important influence on knowledge workers’ reaction to appraisal outcome and how this impacts intention to quit.

Perhaps you are a doctoral student, mapping out how to parcel your dissertation; perhaps you are a junior scholar, strategizing your research plan; perhaps you are a senior scholar, who is thinking about what you want to say to the field. No matter what stage you are at as a management researcher, you might be looking to the Academy of Management (AOM) journals as a natural home for any and all of these creative research pursuits. However, it might not always be crystal clear how you should craft your work for the AOM journals, what contribution you might make at each journal, and consequently to which journal you should target your intellectual contributions.
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A Computational Study of Lower Bounds for the Two Dimensional Bin Packing Problem

An exact algorithm for two-dimensional vector packing problem with volumetric weight and general costs

The vigorous development of electric vehicles (EVs) is an important means of reducing carbon emissions and mitigating environmental problems such as the greenhouse effect. Battery swapping stations (BSSs) can both provide battery swapping services for large-scale EVs and charge batteries centrally. As the supply of fully charged batteries in the BSS shrinks, it becomes necessary to schedule the charging of the depleted batteries rapidly that users have swapped for fully-charged ones. The charging schedule for depleted batteries must be made without knowledge of future battery arrivals. In this context, this paper develops a mathematical model for online charging scheduling of BSSs, formulates the charging strategy as a two-dimensional rectangle packing problem, and quickly calculates the scheduling arrangement of batteries by partitioning the remaining available capacity of a BSS. Since there are limited battery types within the BSS which can provide battery replacement services, this paper supplements the proposed model with known battery types, which improves the utilization of the available capacity of BSSs. Finally, numerical results verify the effectiveness of the proposed model. <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Note to Practitioners</i> —Electric vehicles (EVs) are becoming an alternative way to reduce carbon emissions in transportation systems. Herein, the optimal battery charging problem is the core problem when it comes to dispatching a huge number of EVs. Up to now, battery-swapping is widely used for EVs due to its simple, convenient way. Furthermore, a business model for the battery swapping stations (BSSs) is brought up, where EV users send their depleted batteries to the BSS and the BSS provides the users with a fully charged replacement battery from its warehouse, which only takes a few minutes. Since the maximum charging power of the BSS is limited by the capacity of the transformer connecting the BSS to the power grid, the BSS will adopt an optimal charging schedule that maximizes the charging benefit for large quantities of depleted batteries in the warehouse. However, the challenge is that the charging schedule for depleted batteries must be made without knowledge of future battery arrivals because the EV behaviors are difficult to predict. To address this problem, this paper developed an online charging scheduling algorithm, which formulates the charging strategy as a two-dimensional rectangle packing problem. The proposed method can provide battery replacement services in real-time and solve quickly without any information about incoming depleted EV batteries. The proposed model and method have been tested on the system with different numbers of batteries to show the effectiveness. Besides, the online two-dimensional rectangle packing problem can provide an online decision for BSSs.

Muslim youth have been under scrutiny over the last two decades from a radicalisation and countering violent extremism lens. This bias has largely carried itself to research conducted on Muslim youth in the West. This article undertakes a systematic review and analysis of literature conducted on Muslim youth in the West and in Australia in the last two decades since 11 September 2001. The body of literature in this field can be grouped under three main themes: (1) the impact of terrorism policies and discourse on Muslim youth and their disengaged identities, (2) the relationship between religion (Islam) and civic engagement of Muslim youth, and (3) Muslim youth as active citizens. An important conclusion of this review is that most of the research is dated. There have been significant changes in the development of youth as they quickly evolve and adapt. The systematic review of literature exposed a number of gaps in the research: the current literature ignores generic adolescent factors and external social factors other than Islam that also influence Muslim youth; studies that examine both online and traditional activism and volunteering space are needed to understand the dynamics of change and shift; research needs to focus on Muslim youth who were born and raised in Australia rather than focus only on migrant youth; the ways some Muslim youth use their unique sense of identity as Australian Muslims to become successful citizens engaged in positive action is not known; how Muslim youth use avenues other than their faith to express themselves in civic engagement and their commitment to society is underexplored; it is not known the degree to which bonding networks influence the identity formation and transformation of Muslim youth; there is no research done to examine how adult–youth partnership is managed in organisations that successfully integrate youth in their leadership; there is a need to include Australian Muslim youth individual accounts of their active citizenship; there is a need to understand the process of positive Muslim youth transformations as a complement to the current focus on the radicalisation process. Addressing these gaps will allow a more complete understanding of Muslim youth in the West and inform educational and social policies in a more effective manner.

541 A new model for evaluating emerging technologies: The example of ventricular assist devices

In the field of business research method, a literature review is more relevant than ever. Even though there has been lack of integrity and inflexibility in traditional literature reviews with questions being raised about the quality and trustworthiness of these types of reviews. This research provides a literature review using a systematic database to examine and cross-reference snowballing. In this paper, previous studies featuring a generalized autoregressive conditional heteroskedastic (GARCH) family-based model stock market return and volatility have also been reviewed. The stock market plays a pivotal role in today’s world economic activities, named a “barometer” and “alarm” for economic and financial activities in a country or region. In order to prevent uncertainty and risk in the stock market, it is particularly important to measure effectively the volatility of stock index returns. However, the main purpose of this review is to examine effective GARCH models recommended for performing market returns and volatilities analysis. The secondary purpose of this review study is to conduct a content analysis of return and volatility literature reviews over a period of 12 years (2008–2019) and in 50 different papers. The study found that there has been a significant change in research work within the past 10 years and most of researchers have worked for developing stock markets.

This article addresses several variants of the two-dimensional bin packing problem. In the most basic version of the problem it is intended to pack a given number of rectangular items with given sizes in rectangular bins in such a way that the number of bins used is minimized. Different heuristic approaches (greedy, local search, and variable neighbourhood descent) are proposed for solving four guillotine two-dimensional bin packing problems. The heuristics are based on the definition of a packing sequence for items and in a set of criteria for packing one item in a current partial solution. Several extensions are introduced to deal with issues pointed out by two furniture companies. Extensive computational results on instances from the literature and from the two furniture companies are reported and compared with optimal solutions, solutions from other five (meta)heuristics and, for a small set of instances, with the ones used in the companies.

Sustainability reporting and management control – A systematic exploratory literature review

BackgroundPulmonary mucormycosis caused by Mucorales is a highly lethal invasive fungal infection usually found in immunocompromised patients. Isolated pulmonary mucormycosis in immunocompetent patients is very rare. Here, we present a case of a 32-year-old male who developed pulmonary mucormycosis without any known immunodeficiency.Case presentationThe patient presented to our hospital because of cough and chest pain along with blood in the sputum. He was first treated for community-acquired pneumonia until bronchoalveolar lavage fluid culture confirmed the growth of Absidia. His symptoms were relieved with the use of amphotericin B, and he eventually recovered. We also provide a systematic review of relevant literature to summarize the characteristics of pulmonary mucormycosis in immunocompetent patients.ConclusionsPulmonary mucormycosis has variable clinical presentations and is difficult to identify. Due to its high fatality rate, clinicians should make judgements regarding suspected cases correctly and in a timely manner to avoid misdiagnosis and delayed treatment.

Purpose Proximal row carpectomy is a well-established technique for the management of wrist arthritis; however, patient selection and long-term durability of proximal row carpectomy is still a matter of controversy. Hence, we conducted a systematic review of the English literature to determine the best evidence on long-term outcomes following proximal row carpectomy. Methods A MEDLINE search using the term "proximal row carpectomy" was performed. A total of 192 studies were identified. All studies with 10 or more years of follow-up were included in the review. Data extracted included patient demographics, indications for surgery, previous surgery, outcome assessment, and information on complications and failures. Results A total of 147 patients from six studies met the inclusion criteria and were included in the study. The majority of patients were male and involved in manual labor. There was no significant difference between the preoperative and long-term postoperative motion. The weighted mean for postoperative grip strength was 68.4% compared with the contralateral side. Disabilities of the arm, shoulder, and hand; patient-rated wrist examination; and Mayo wrist scores were comparable to those reported for four-corner arthrodesis. There were 21 failures (14.3%) requiring re-operation. Failures were not associated with a specific preoperative diagnosis but distributed among patients with Kienböck disease, scaphoid nonunion advanced collapse, and scapholunate advanced collapse arthritis. Conclusions This systematic review confirms the long-term durability of proximal row carpectomy when used for the treatment of wrist arthritis. Although radiocapitate arthritis develops over time in most patients, the clinical significance of this finding is undetermined and does not necessarily correlate with failure of proximal row carpectomy. Poorer long-term outcomes are likely to result in patients engaged in heavy manual labor, whereas better outcomes may be obtained in patients undergoing proximal row carpectomy for trauma or earlier-stage Kienböck disease.