DNA computing based stream cipher for internet of things using MQTT protocol

Internet of Things (IoT) is a rapidly developing technology that enables “devices” to communicate and share information amongst them without human control. The devices have the features of internet connectivity and networking. Due to the increasing demands of a secure environment in IoT application, security has become a crucial aspect on which researchers have been increasingly focused. Connecting devices to the internet can facilitate intruders to attack devices as they can access the data from anywhere in the globe. In this work, an encryption–decryption process-based stream cipher has been used. The messages between IoT nodes were encrypted using One Time Pad (OTP) and DNA computing. Furthermore, the required key sequence was generated using a linear feedback shift register (LFSR) as a pseudo number key generator. This key sequence was combined to generate a unique key for each message. The algorithm was implemented using source python and tested on a Raspberry pi under Linux open operation system

African-American Enrollment and Retention in Higher Education: An Application of Game Theory

This study is a qualitative analysis of perceptions of institutional commitment to the enrollment and retention of African-American students at one institution. The study, which was funded by the Spencer Foundation, was conducted at Oberlin College and is based on 31 interviews of students, faculty, administrators, and staff. At many predominantly white campuses, low enrollment and poor retention of African-American students is a present and escalating problem. However, Oberlin College has unusually high enrollment and retention rates for African-American students. We wanted to explore the possible reasons for this uniqueness. We relate our findings to the process of constructing theories that explain some of the characteristics of Oberlin\u27s organizational culture

Protective effects of a gastrointestinal agent containing Korean red ginseng on gastric ulcer models in mice

<p>Abstract</p> <p>Background</p> <p>Korean red ginseng (KRG) is a ginseng that has been cultivated and aged for 4-6 years or more, and goes through an extensive cleaning, steaming and drying process. KRG contains more than 30 kinds of saponin components and has been reported as having various biological properties, such as anti-fatigue action, immune restoration, and neurovegetative effect. The purpose of this study was to assess the effects of a KRG-containing drug (KRGCD) on gastric ulcer models in mice.</p> <p>Methods</p> <p>Stomach ulcers were induced by oral ingestion of hydrochloride (HCl)/ethanol or indomethacin. Treatment with KRGCD (30, 100, and 300 mg/kg, p.o.) occurred 1 hr before the ulcer induction. Effect of KRGCD on anti-oxidant activity and gastric mucosal blood flow with a laser Doppler flowmeter in mice stomach tissue was evaluated.</p> <p>Results</p> <p>KRGCD (100 and 300 mg/kg, p.o.) significantly decreased ethanol- and indomethacin-induced gastric ulcer compared with the vehicle-treated (control) group. KRGCD (100 and 300 mg/kg) also decreased the level of thiobarbituric acid reactive substance (TBARS) and increased gastric mucosal blood flow compared with the control group.</p> <p>Conclusions</p> <p>These results suggest that the gastroprotective effects of KRGCD on mice ulcer models can be attributed to its ameliorating effect on oxidative damage and improving effect of gastric mucosal blood flow.</p

Black Girls Speak STEM: Counterstories of Informal and Formal Learning Experiences

This study presents the interpretations and perceptions of Black girls who participated in I AM STEM – a community-based informal science, technology, engineering, and mathematics (STEM) program. Using narrative inquiry, participants generated detailed accounts of their informal and formal STEM learning experiences. Critical race methodology informed this research to portray the dynamic and complex experiences of girls of color, whose stories have historically been silenced and misrepresented. The data sources for this qualitative study included individual interviews, student reflection journals, samples of student work, and researcher memos, which were triangulated to produce six robust counterstories. Excerpts of the counterstories are presented in this article. The major findings of this research revealed that I AM STEM ignited an interest in STEM learning through field trips and direct engagement in scientific phenomena that allowed the girls to become agentic in continuing their engagement in STEM activities throughout the year. This call to awaken the voices of Black girls to speak casts light on their experiences and challenges as STEM learners ⎯ from their perspectives. The findings confirm that when credence and counterspaces are given to Black girls, they are poised to reveal their luster toward STEM learning. This study provided a space for Black girls to reflect on their STEM learning experiences, formulate new understandings, and make connections between the informal and formal learning environments within the context of their everyday lives, thus offering a more holistic approach to STEM learning that occurs across settings and over a lifetime

Dual alpha2C/5HT1A receptor agonist allyphenyline induces gastroprotection and inhibits fundic and colonic contractility

Allyphenyline, a novel α2-adrenoceptor (AR) ligand, has been shown to selectively activate α2C-adrenoceptors (AR) and 5HT1A receptors, but also to behave as a neutral antagonist of α2A-ARs. We exploited this unique pharmacological profile to analyze the role of α2C-ARs and 5HT1A receptors in the regulation of gastric mucosal integrity and gastrointestinal motility

Minimization of embodied carbon footprint from housing sector of Malaysia

The reduction in embodied carbon footprint is one of the major concerns in the construction industry. Among many other adopted techniques, the use of recycled materials is one of recommended method to lower the environmental effects of construction materials. However, the potential of recycled materials to offset the embodied carbon footprint from conventional Malaysian housing construction requires to be evaluated. The main focus of study was to perform a comparative analysis for minimization of embodied carbon footprint from the conventional materials used Malaysian housing industry by using recycled materials. A typical double story semi-detached house commonly constructed in Malaysian tropical climate was selected as case study. The model of the house was generated in a virtual environment using Building Information Modelling (BIM) process. The results highlighted that with incorporation of recycled materials within a range of 0 % to 100 %, the embodied carbon footprint offset potential varied up to 18 % as compared to conventional construction

The Quality Improvement Programme (QIP) in Yemen: a successful experience to step up health providers behavior and to increase health services results

info:eu-repo/semantics/publishe

The systemic quality improvement network: a new experience in coordinating and strengthening international and national expertise promoting systemic quality improvement approaches

info:eu-repo/semantics/publishe

The systemic quality improvement SQI) approach and the International SQI network

info:eu-repo/semantics/publishe