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Secure Device to Device Communications using Lightweight Cryptographic Protocol
Ajith Kumar, V,Reddy, K Satyanarayan International Journal of Computer ScienceNetwork S 2021 International journal of computer science and netw Vol.21 No.11
The device to device (D2D) communication is an important and emerging area for future cellular networks. It is concerned about all aspect of secure data transmission between end devices along with originality of the data. In this paradigm, the major concerns are about how keys are delivered between the devices when the devices require the cryptographic keys. Another major concern is how effectively the receiver device verifies the data sent by the sender device which means that the receiver checks the originality of the data. In order to fulfill these requirements, the proposed system able to derive a cryptographic key using a single secret key and these derived keys are securely transmitted to the intended receiver with procedure called mutual authentication. Initially, derived keys are computed by applying robust procedure so that any adversary feel difficulties for cracking the keys. The experimental results shows that both sender and receiver can identify themselves and receiver device will decrypt the data only after verifying the originality of the data. Only the devices which are mutually authenticated each other can interchange the data so that entry of the intruder node at any stage is not possible.
Subcooled flow boiling of self-rewetting fluid in parallel microchannel heat sink
Ajith Krishnan R,Hee Joon Lee(이희준) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
In this work the experimental study of flow boiling performance of de-ionized water and self-rewetting aqueous n-butanol solution (2 wt%) in a multiple parallel microchannel heat sink is presented. The experiments were conducted with a mass flux of 58 kg/㎡s and 115 kg/㎡s, and with an inlet temperature of 30℃. It was observed from the trials that the critical heat flux (CHF) was improved slightly for the case of self-rewetting fluid with higher heat transfer coefficient when compared with de-ionized water. The bubble departure diameter was observed to be smaller in the case of self-rewetting fluid with an early onset of nucleate boiling (ONB). The enhancement in CHF and heat transfer coefficient in case of self-rewetting fluid is due to the combined effect of thermo-capillary flow/ reversed Marangoni flow and wetting improvement of the channel surface by rewetting fluid.
Ajith Krishnan R,Zhong Han Chai,Hanbee Na,Hee Joon Lee 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.7
Flow boiling experiments in microchannels under low mass fluxes have rarely been reported in the literature. In this study, flow boiling critical heat flux (CHF) for a parallel straight copper microchannel heat sink with 41 channels and hydraulic diameter of 420 µm (width: 300 µm; height: 700 µm) is reported under low mass fluxes(< 100 kg/m 2 s). The flow patterns reveal that the inertial force will be too low to flush the bubble downstream. The heat transfer coefficient was observed to decrease with an increase in the heat flux or vapor quality, which pointed toward convective boiling dominancy inside the channels. When approaching the CHF, the vapor flowed back to the heat sink's inlet plenum, resulting in a flow blockage, which is the main factor for the CHF occurrence.
The Influence of Physician-Rating Websites on Patient Physician Preference
Ajith Malige,Kristofer S. Matullo 대한정형외과학회 2020 Clinics in Orthopedic Surgery Vol.12 No.2
Background: Physician-rating websites (PRWs) are designed to publicly report physician quality information while bringing forth a sense of transparency. This study looks to identify the influence PRWs have on a patient’s choice of orthopedic hand surgeon while stratifying patient physician preference by various demographic characteristics. Methods: This survey-based study was conducted in a suburban outpatient orthopedic hand practice. All patients between 18 to 89 years of age who presented for an appointment were asked to participate. Survey questions aimed to identify patient demographics and the sources patients used to choose their hand surgeon. Results: Overall, 104 patients completed our survey. Our study population was predominantly between 51 and 70 years of age (50.0%), women (60.6%), and Caucasian (84.6%), received a general education degree or high school diploma (36.5%), was employed (49.0%), and owned private health insurance (59.6%). One hundred and two patients (98.1%) answered that their physician’s reputation is important. Seventy-five patients (72.1%) reported that they heard about their surgeon by physician referral, while only two (1.9%) used online search engines. Sixty-six patients (63.5%) noted that physician referrals were most trustworthy. Only 10 patients (9.6%) consulted PRWs to choose their surgeon, most of whom were younger than 50 years (n = 6), Caucasian (n = 8), and employed (n = 7) and had schooling after high school (n = 8). Conclusions: Despite increases in digital information exchange platforms, PRWs are not commonly used by suburban orthopedic hand patients to exchange information about or choose their hand surgeon. Patients still primarily rely on physician referrals and word of mouth from family and friends to choose their surgeon.
Generalized chorea due to secondary polycythemia responding to phlebotomy
Ajith Cherian,Naveen Kumar Paramasivan,Divya Kalikavil Puthanveedu,Syam Krishnan,Amitha Radhakrishnan Nair 대한파킨슨병및이상운동질환학회 2021 Journal Of Movement Disorders Vol.14 No.1
Chorea can be seen in association with polycythemia rubra vera (PV) or primary polycythemia, especially in elderly women. However, chorea due to secondary polycythemia is rare, and we report a case in an adolescent boy due to congenital cyanotic heart disease and its rewarding response to phlebotomy.
Review of Physician Referrals to Orthopedic Spine versus Neurosurgery
Ajith Malige,Roger Yuh,Vikas Yellapu,Vince Lands,Barrett Woods,Gbolabo Sokunbi 대한정형외과학회 2020 Clinics in Orthopedic Surgery Vol.12 No.1
Background: Previous studies have reported what patients value while choosing their surgeon, but there are no studies exploring the patterns of referral to spine surgeons among primary care physicians (PCPs). This study aims to identify any trends in PCPs’ referral to orthopedic surgery versus neurosurgery for spinal pathology. Methods: In total, 450 internal medicine, family medicine, emergency medicine, neurology, and pain management physicians who practice at one of three locations (suburban community hospital, urban academic university hospital, and urban private practice) were asked to participate in the study. Consenting physicians completed our 24-question survey addressing their beliefs according to pathologies, locations of pathologies, and surgical interventions. Results: Overall, 108 physicians (24%) completed our survey. Fifty-seven physicians (52.8%) felt that neurosurgeons would provide better long-term comprehensive spinal care. Overall, 66.7% of physicians would refer to neurosurgery for cervical spine radiculopathy; 52.8%, to neurosurgery for thoracic spine radiculopathy; and 56.5%, to orthopedics for lumbar spine radiculopathy. Most physicians would refer all spine fractures to orthopedics for treatment except cervical spine fractures (56.5% to neurosurgeons). Most physicians would refer to neurosurgery for extradural tumors (91.7%) and intradural tumors (96.3%). Most would refer to orthopedic surgeons for chronic pain. Finally, physicians would refer to orthopedics for spine fusion (61.1%) and discectomy (58.3%) and to neurosurgery for minimally invasive surgery (59.3%). Conclusions: Even though both orthopedic surgeons and neurosurgeons are intensively trained to treat a similar breath of spinal pathology, physicians vary in their referring patterns according to spinal pathology, location of pathology, and intended surgery. Education on the role of spine surgeons among PCPs is essential in ensuring unbiased referral patterns.
Ajith Anand The Korean Society of Plant Biotechnology 2003 Plant molecular biology and biotechnology research Vol.5 No.4
Tissue culture techniques arguably are an important approach for ex situ conservation of rare and endangered plant species. However, there is utmost importance on maintaining the genetic integrity of the introduced plants especially in tree species. To examine the genetic integrity of the micropropagated plants, we randomly screened few hardened plants of Syzygium travancoricum, a critically endangered tree taxon, using Randomly Amplified Polymorphic DNA (RAPD) markers. Twenty-three random. primers were tried and twenty-five polymorphic loci were identified. The dendrogram based on the Unweighted Pair-Group Method Arithmetic Average and Nei's similarity index depicted about 97% homology between the mother plants and micropropagated plants. Further, an attempt was made to reintroduce the micropropagated plants in the wild. Over three hundred small trees could be successfully established.