Social workers contributed significantly to the promotion of public and community health during the initial outbreak of COVID-19 in China. Based on a quasi-scoping review of articles on social work practice during that outbreak, this reflective article elucidates how social workers contributed in three chronological stages. In the early stage (late January and February 2020), social workers provided community services offered as part of the governmental structure (moderate information and resource provision); in the middle stage (March 2020), social workers provided services to vulnerable groups alongside supporting the quarantine strategy; and in the late stage (April 2020 onwards), their services were focused on recuperation and recovery after the national lockdown was lifted. In the meanwhile, several issues for public and community health social work as a profession in terms of how it was able to support anti-COVID-19 practices became clear, including a lack of independence and stability, the need for better flexibility and greater ability to act pragmatically and lack of professional agreement. This article aims to enlighten the development of a (re)emerging field—public health and community health social work in China in the wake of the COVID-19 pandemic.

Abstract. The rapid evolution of terrestrial wireless systems has brought mobile users more and more desired communication services. Maritime customers are asking for the same, such as the concepts of "Broadband at Sea" and "Maritime Internet". Quite a lot of research work has focused on the development of new and better maritime communication technologies, but less attention has been paid on interworking of multiple maritime wireless networks or on satisfying service provisioning. To address this, an integrated wireless Communication Architecture for Maritime Sector (CAMS) has been introduced in this article. CAMS is aimed at 1) granting maritime customers uninterrupted connectivity through the best available network and 2) providing them with the bestprovisioned communication services in terms of mobility, security and Quality of Experience (QoE). To address mobility challenge, the IEEE 802.21 standard is recommended to be used in CAMS in order to achieve seamless handover. CAMS provides application-level QoE support attending to the limited communication resources (e.g. bandwidth) at sea. Certain security considerations have also been proposed to supplement this architecture.

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Cooperative communications, in which a relay node assists the source node to deliver its packets to the destination node thus adding diversity, is gaining more attention within the research community. The initial studies on the physical layer have shown significant gains from cooperative diversity in terms of reliability, coverage range and energy efficiency. A Cooperative Automatic Repeat reQuest MAC protocol, (C-ARQ), has been proposed to utilize cooperative diversity from the MAC layer. In this paper, we inspect this novel C-ARQ protocol to check its integrity and validity using formal methods. The protocol logic is modeled in SDL and implemented in PROMELA. The functionality of the C-ARQ protocol is confirmed through simulations and verified using the SPIN tool.

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