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Sitting in a chair is a typical act of modern people. Prolonged sitting and sitting with improper postures can lead to musculoskeletal disorders. Thus, there is a need for a sitting posture classification monitoring system that can predict a sitting posture. The purpose of this paper is to develop a system for classifying children’s sitting postures for the formation of correct postural habits.

For the data analysis, a pressure sensor of film type was installed on the seat of the chair, and image data of the postu.re were collected. A total of 26 children participated in the experiment and collected image data for a total of seven postures. The authors used convolutional neural networks (CNN) algorithm consisting of seven layers. In addition, to compare the accuracy of classification, artificial neural networks (ANN) technique, one of the machine learning techniques, was used.

The CNN algorithm was used for the sitting position classification and the average accuracy obtained by tenfold cross validation was 97.5 percent. The authors confirmed that classification accuracy through CNN algorithm is superior to conventional machine learning algorithms such as ANN and DNN. Through this study, we confirmed the applicability of the CNN-based algorithm that can be applied to the smart chair to support the correct posture in children.

This study successfully performed the posture classification of children using CNN technique, which has not been used in related studies. In addition, by focusing on children, we have expanded the scope of the related research area and expected to contribute to the early postural habits of children.

The COVID-19 pandemic has triggered a time of crisis and uncertainty for the air transportation industry. The gloomy prospects for the industry have stretched business resilience to a critical point. The crisis has caused damage and shock that the aviation industry has never endured before. This paper aims to provide a comprehensive understanding of both internally and externally generated airline response strategies by examining business practices for crisis management.

This study screened research papers and economic reports from authoritative organizations including the International Air Transport Association, International Civil Aviation Organization, World Health Organization and United Nations World Tourism Organization from December 2019 (the month in which the COVID-19 outbreak occurred) to March 2021 (the most recent month at present). The authors also integrated publicly recognized news articles to cover a wide range of business practices in the airline industry. The authors conducted thematic analysis by filtering news articles and economic reports that mentioned the keywords “COVID-19,” “pandemic,” “CoV-2,” “coronavirus” and “corona.” The authors coded the airlines’ response actions along the two-axis matrix (time and magnitude) and generated insights in a timely manner.

Major airlines have modified decision-making in relation to the exponential spread of the virus, which is in direct proportion to the deterioration level in the airline industry. When the impact was low in the early stage, major airlines maintained their status quo. Before long, the magnitude of the destruction became high, which made airlines implement capacity adjustments and request government relief measures. As industrial deterioration deepens, airlines keep calling for state aid packages and have changed their focus to the cargo transportation of high-demand commodities and pharmaceutical supplies. Lastly, industrial adversity and uncertainty have made them defer aggressive takeover opportunities.

Several researchers have investigated the impacts of the COVID-19 on the airline industry. However, there remains a dearth of scholarship on the hampered business activities and crisis management of the airline industry. In the absence of sufficient response strategies against the COVID-19 panic, this paper is to provide a comprehensive understanding of the major airlines’ response strategies to the COVID-19 pandemic. In addition, this paper yields an opportunity for on-site management to review how major global airlines have responded to the crisis and find managerial insights to restore their business sustainability.

冠状病毒大流行引发了航空业的危机时刻和不确定性。 该行业前景黯淡, 业务弹性已达到临界点。 这场危机造成了航空业从未经历过的破坏和震惊。 在本文中, 我们通过检查用于危机管理的业务实践, 对内部和外部生成的航空公司响应策略提供了全面的了解。

我们的研究筛选了IATA, ICAO, WHO和UNWTO等权威组织从2019年12月（发生冠状病毒爆发的月份）到2021年3月（目前的最近一个月）的研究论文和经济报告。 我们还整合了公众认可的新闻报道, 以涵盖航空业的广泛业务实践。 我们通过过滤提及关键词“ COVID-19”, “大流行”, “ CoV-2”, “冠状病毒”的新闻文章和经济报告进行了主题分析。 我们沿两轴矩阵（时间和幅度）对航空公司的响应行动进行了编码, 并及时产生了我们的见解。

大型航空公司已根据行业恶化率修订了有关病毒指数传播的决定。 当最初的影响很小时, 主要航空公司保持现状。 很快, 损失变得如此严重, 以至于航空公司不得不调整机动性并要求政府救济。 随着航空业恶化的加剧, 航空公司继续呼吁国家提供援助计划, 以将重点转移到高需求商品和药品的运输上。 最后, 行业低迷和不确定性延迟了积极的收购机会。

几位研究人员调查了冠状病毒对航空业的影响。 但是, 对于航空业受阻的商业活动和危机管理, 仍然缺乏奖学金。 在没有足够的应对冠状病毒恐慌的应对策略的情况下, 本文旨在全面了解主要航空公司对冠状病毒恐慌的应对策略。 此外, 本文还为现场管理人员提供了一个机会, 可以回顾主要的全球航空公司如何应对危机并找到管理见解以恢复其业务可持续性。

La pandemia de COVID-19 ha desencadenado una época de crisis e incertidumbre para la industria del transporte aéreo. Las sombrías perspectivas para la industria han llevado la resistencia empresarial a un punto crítico. La crisis ha causado daños y conmociones que la industria de la aviación nunca antes había soportado. En este documento, proporcionamos una comprensión integral de las estrategias de respuesta de las aerolíneas generadas tanto interna como externamente mediante el examen de las prácticas comerciales para la gestión de crisis.

Nuestro estudio examinó los documentos de investigación y los informes económicos de organizaciones autoritarias, incluidas la IATA, la OMS y la ONUWTO, desde diciembre de 2019 (el mes en el que ocurrió el brote de COVID-19) hasta marzo de 2021 (el mes más reciente actualmente). También hemos integrado artículos de noticias reconocidos públicamente para cubrir una amplia gama de prácticas empresariales en la industria aeronáutica. Hemos realizado un análisis temático filtrando artículos de noticias y informes económicos que mencionaban las palabras clave “COVID-19”, “pandémica”, “CoV-2”, “coronavirus” y “corona”. Codificamos las acciones de respuesta de las compañías aéreas a lo largo de la matriz de dos eje (tiempo y magnitud) y generamos nuestras ideas en un momento oportuno.

Las principales aerolíneas han modificado la toma de decisiones en relación con la propagación exponencial del virus, que es directamente proporcional al nivel de deterioro de la industria aeronáutica. Cuando el impacto fue bajo en la etapa inicial, las principales aerolíneas mantuvieron su status quo. En poco tiempo, la magnitud de la destrucción se hizo alta, lo que hizo que las aerolíneas implementaran ajustes de capacidad y solicitaran medidas de socorro del gobierno. A medida que se profundiza el deterioro industrial, las aerolíneas siguen pidiendo paquetes de ayuda estatal y han cambiado su enfoque hacia el transporte de carga de productos básicos de alta demanda y suministros farmacéuticos. Por último, la adversidad y la incertidumbre industriales les han hecho posponer las oportunidades de adquisición agresivas.

Varios investigadores han investigado los impactos del COVID-19 en la industria de las aerolíneas. Sin embargo, sigue habiendo escasez de estudios sobre las actividades comerciales obstaculizadas y la gestión de crisis de la industria de las aerolíneas. En ausencia de estrategias de respuesta suficientes contra el pánico de COVID-19, este documento tiene como objetivo proporcionar una comprensión integral de las estrategias de respuesta de las principales aerolíneas a la pandemia de COVID-19. Además, este documento brinda una oportunidad para que la gerencia en el sitio revise cómo las principales aerolíneas mundiales han respondido a la crisis y encuentre información gerencial para restaurar la sostenibilidad de su negocio.

The purpose of this paper is twofold: first, to present a bibliometric analysis and systematic literature review of industry convergence and value innovation to understand the current research status; second, to provide a coherent theoretical research framework for future research.

This study adopts a two-step analysis approach by combining bibliometric analysis and systematic literature review to explore the research topic of industry convergence and value innovation. Besides, two bibliometric tools, HistCite and VOSviewer, were applied to this study.

This study found that Stefanie Bröring and Fredrik Hacklin are the top two most influential authors among all authors in the sample publications. Technological Forecasting and Social Change is one of the top-ranking journal that often publishes this topic of articles. Germany and the University of Munster are the most influential country and institutions, respectively. Besides, five core research themes were identified based on keywords co-occurrence map, theoretical lenses, factors promoting industry convergence, indicators of industry convergence, the impact of industry convergence and emerging research directions. Based on the above analysis, this paper constructed a theoretical research framework of industry convergence and value innovation.

This paper only draw data from one database – Web of Science – which cannot provide broad coverage of the research topic. Besides, the bibliometric method of this paper is based on high local citation score and high-frequency words, articles in the skirting subjects’ area may not be analyzed.

With the rapid development of technology, such as nanotechnology, radio - frequency identification (RFID), etc., the iterative upgrading of products also comes. As a result, the boundary between industries is gradually blurred, and the phenomenon of industry convergence appears. Therefore, managerial decision-makers are facing challenges of how to respond to the convergence phenomena. From the firm level, firms are facing the problem of value innovation of the existing product, new product development and core competence improvement. Industries are facing the problem of transformation and upgrading. This paper provides certain theoretical insights for both firms and industries to guide the practice accordingly.

This paper is the first to use a bibliometric method to examine the topic of industry convergence and value innovation. In addition, this paper presents an in-depth analysis of this topic and provides a comprehensive theoretical research framework for future study.

Previous literature on WOM has consistent findings on the positive and significant effect of WOM volume on product sales, but the literature on WOM valence has been mixed. In this study, the authors aim to explain the reason for the mixed effect of WOM valence on product sales by considering heterogeneous characteristics of products, especially in the movie market, by segmenting products into mainstream and non‐mainstream movies.

This study uses empirical data from the motion picture industry, such as box office revenue, WOM volume and valence, and other variables of movie characteristics. The hypothesis is tested using OLS and panel data analysis in econometric methods.

The authors find a significant effect of WOM valence on box office revenue only in the case of non‐mainstream movies, which have relatively smaller marketing budgets than mainstream movies. The findings suggest that as marketing communication channels become more diverse, with larger marketing budgets, the effect of online WOM valence on product sales can be diluted. In addition, it is found that the effect of WOM volume on box office revenue is greater for mainstream movies, suggesting that consumers build higher credibility on products with larger sales or WOM volume, especially for experience goods with uncertain quality.

The findings explain the weak relationship between WOM valence and product sales, which has been controversial in the WOM literature, and broaden the understanding of the effect of WOM on product sales.

The relationship between WOM valence and sales and, consequently, the revenue of a good has not been clearly understood, considering the heterogeneous characteristics of consumers in previous literature. In this study, it is found that WOM volume and valence have different effects on product sales, corresponding to differences in product category. The findings suggest a reason for the weak relationship between WOM valence and product sales, which has been controversial in the WOM literature.

The purpose of this paper is to examine the relationship between service integration and manufacturing firms’ profitability and to identify profitable services.

The study examines the service integration data of 202 firms in the machinery and equipment sector in Korea. Firm profitability comes from secondary data to eliminate common method bias.

The relationship between service integration, measured as the service-revenue ratio, and profitability has an inverted U-shape, likely stemming from political costs, a loss of opportunity in manufacturing improvements arising from resource constraints, and an increase in transaction costs. In addition, process operation outsourcing and technical consulting significantly contribute to profitability.

The authors show that the effect of service integration on profitability diminishes when firms experience both resource constraints and an increase in transaction costs from implementing the strategy. Furthermore, the profitability of services is heterogeneous across different offerings. Further research in other countries and sectors is necessary to refine the relationships suggested herein.

Managers should strive to minimize the costs and problems stemming from resource constraints and transaction costs. It is also important to utilize external resources to achieve profitability from service integration. Managers also need to realize the different cost-revenue structure of each service.

The authors find that the relationship between profitability and service integration depends on the degree of resource constraints and transaction costs. The authors also identify which service offerings are highly profitable, which has not been done in previous research.