Organizational citizenship behavior becomes one of the significant factors that enhance the organizational efficiency. Organizational citizenship behavior has been defined as behaviors that an employee voluntarily engages in organization that promote the effectiveness of clearly rewarded by the organization. However organizational commitment is very beneficial for the organization because it reduces the absenteeism rate and turnover ratio and enhances the organization productivity. In all of the organization, organizational commitment exerts a positive effect on the nurses' performance. The aim was to assess the relationship between organizational citizenship behavior and organizational commitment among nurses. The descriptive correlational design was used to explore the relationship between organizational citizenship behavior and organizational commitment among nurses. Simple random sampling was used and sample size was 164. Data were collected by a self-structured questionnaire during November 2019 to December 2019 at Dhaka Medical College Hospital. Data were analyzed using SPSS version 21. The result showed that average age of the participants was 34.19 years old. There were statistically positive significant relationships between organizational citizenship behavior with organizational commitment (r = 0.82, p = 0.000), organizational citizenship behavior with working ward (F = 6.31, p = 0.000) and organizational commitment with working ward (F = 4.45, p = 0.002). Based on the results of this study, it is indicated that lack of OCB & OC among nurses' is moderate level. The findings of this study will suggest reducing organizational hazard, and developing citizenship behavior and organizational commitment that enhance high outcome in health care organizations & quality of care. So hospital should provide in-service training for nurses' and all departments are equally. Predictive study of factors related to OCB & OC is recommended for future study. How to cite this paper: Hossain, Md.M.

The rapid development of personal health records (PHR) systems enables an individual to collect, create, store and share his PHR to authorized entities. Health care systems within the smart city environment require a patient to share his PRH data with a multitude of institutions' repositories located in the cloud. The cloud computing paradigm cannot meet such a massive transformative healthcare systems due to drawbacks including network latency, scalability and bandwidth. Fog computing relieves the burden of conventional cloud computing by availing intermediate fog nodes between the end users and the remote servers. Aiming at a massive demand of PHR data within a ubiquitous smart city, we propose a secure and fog assisted framework for PHR systems to address security, access control and privacy concerns. Built under a fog-based architecture, the proposed framework makes use of efficient key exchange protocol coupled with ciphertext attribute based encryption (CP-ABE) to guarantee confidentiality and fine-grained access control within the system respectively. We also make use of digital signature combined with CP-ABE to ensure the system authentication and users privacy. We provide the analysis of the proposed framework in terms of security and performance.

The Internet of Medical Things (IoMT) offers an infrastructure made of smart medical equipment and software applications for healthcare services. Through the internet, the IoMT is capable of providing remote medical diagnosis and timely health services. The patients can use their smart devices to create, store and share their electronic health records (EHR) with a variety of medical personnel including medical doctors and nurses. However, unless the underlying commination within IoMT is secured, malicious users can intercept, modify and even delete the sensitive EHR data of patients. Patients also lose full control of their EHR since most healthcare services within IoMT are constructed under a centralized platform outsourced in the cloud. Therefore, it is appealing to design a decentralized, auditable and secure EHR system that guarantees absolute access control for the patients while ensuring privacy and security. Using the features of blockchain including decentralization, auditability and immutability, we propose a secure EHR framework which is mainly maintained by the medical centers. In this framework, the patients' EHR data are encrypted and stored in the servers of medical institutions while the corresponding hash values are kept on the blockchain. We make use of security primitives to offer authentication, integrity and confidentiality of EHR data while access control and immutability is guaranteed by the blockchain technology. The security analysis and performance evaluation of the proposed framework confirms its efficiency.