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This paper aims to propose an odor sensing system based on wide spectrum for e-nose, based on comprehensive analysis on the merits and drawbacks of current e-nose.

The wide spectral light is used as the sensing medium in the e-nose system based on continuous wide spectrum (CWS) odor sensing, and the sensing response of each sensing element is the change of light intensity distribution.

Experimental results not only verify the feasibility and effectiveness of the proposed system but also show the effectiveness of least square support vector machine (LSSVM) in eliminating system errors.

Theoretical model of the system was constructed, and experimental tests were carried out by using NO₂ and SO₂. System errors in the test data were eliminated using the LSSVM, and the preprocessed data were classified by euclidean distance to centroids (EDC), k-nearest neighbor (KNN), support vector machine (SVM), LSSVM, respectively.

The system not only has the advantages of current e-nose but also realizes expansion of sensing array by means of light source and the spectrometer with their wide spectrum, high resolution characteristics which improve the detection accuracy and realize real-time detection.

This paper aims to understand consumption values buying from informal retail markets (i.e., street vendor retailing). It also explores why consumers prefer daily necessary goods from the informal compared to the formal retail market (such as supermarkets, retail chain outlets and e-commerce).

Employing the qualitative research approach, this study collected data from nine respondents in two areas in Malaysia. Data were collected using semi-structured interviews and analysed using the thematic analysis technique. Only representative verbatim codes were presented under five themes of consumption value theory.

Consumers are triggered by the convenience, ease, and exclusive products (conditional value), friendly and known relationship with informal sellers, as well as the availability of some particular food items (emotional value) and lower price and freshness of groceries (functional value) while buying from informal compared to formal retail vendor.

This study provides knowledge implications to the consumption value theory. Functional, emotional, and conditional values are the dominant components of purchase behaviour in informal compared to formal retail channels. Social values are common, whereas epistemic value is more substantial in formal retailing.

Findings are helpful for informal retail businesses to understand consumers' buying behaviour. Informal retail owners should ensure that commodities are fresh, highly affordable and available in the local communities. Building a friendly relationship with consumers would be a key to the success of this retail sector.

Authorities should support informal sellers to set up mobile retail stores in residential areas. This effort would offer greater convenience to both parties in informal businesses and ensure informal sellers' financial and social well-being.

Despite the widespread acceptance of buying goods from informal retail vendors, research on consumption value in informal retailing is largely overlooked. Previous research primarily deals with formal market phenomena due to their size and economic contribution. Consequently, current literature lacks an understanding of why consumers prefer to buy from informal retail vendors for their daily groceries when the formal retail channel could fulfil similar needs. Using a qualitative research design, this research uncovers consumers' buying motives from informal compared to formal vendors.

This paper aims to provide a systematic meta-analysis from the year 2000 up to 2021 by reviewing relevant studies in extant literature related to the impact of social media on mental health.

This study adopts bibliometric methods and longitudinal statistical analysis to analyze extant literature. The structured literature review and meta-analysis findings on social media usage (SMU) and its impact on mental health indicate emerging research patterns in potentially leading to an integrative view.

This paper highlights the importance of challenges regarding SMU and its impact on users’ mental health. This study shows interesting meta-analysis on the issues such as Facebook and teenagers’ mental health; Instagram and teenagers’ mental health; Twitter and teenagers’ mental health; and so on from the past 20 years.

This paper is a literature review on a critical social issue like SMU and its impact on users’ mental health. The meta-analysis is conducted only on the indexed paper and does not take the books, blogs and other kinds of literature in this domain. The analysis is carried out only for the research articles published from 2000 to 2021.

Social media refers to any platform involving interactive digital technologies that encourage and facilitate users’ participation. SMU and its impact on users’ mental health can be attributed as contributing factors to the next global crisis. Studies suggest that increased SMU can potentially make users socially anxious. This study provides input to the policymakers, scholars and practitioners to understand the gravity of the situation and develop appropriate policy to overcome the challenges.

The rapidly evolving nature of technology and social media calls for a careful examination of its risks despite the many benefits of e-participation and digital interaction. Although there is widespread acknowledgment of the problematic revelation that the pattern of SMU closely mirrors mainstream addictive behavior; yet, there are only a limited number of comparative studies available. This may be one of the few studies which highlight the issue of SMU and its impact on users’ mental health. Moreover, this study also adds to the body of literature.