Samiur Rahman - Academia.edu (original) (raw)

Papers by Samiur Rahman

NGN is an IP based heterogeneous network environment, converges wired and wireless network techno... more NGN is an IP based heterogeneous network environment, converges wired and wireless network technologies, offer a wide range of services to the customers with generalized mobility. It enables the customers to avail unrestricted services from different service providers of different networks, ensures enhanced and consistent services and reduces network and operational complexities. NGN, though, is embedded with unique characteristics of offering voice, data and video services over the same network with guaranteed quality of service, there are numerous critical security issues exist which need to be addressed. There are quite a lot of proposals for the security architecture of the NGN, but the ever growing vulnerabilities, threats and the attacks on NGN environment, demand the necessity for NGN security mechanisms. Hence, in this paper, a novel integrated security architecture for NGN has been proposed.

Radar Sensor Technology XXIV, 2020

Cells, 2020

The MRE11-RAD50-NBS1 (MRN) protein complex is one of the primary vehicles for repairing DNA doubl... more The MRE11-RAD50-NBS1 (MRN) protein complex is one of the primary vehicles for repairing DNA double strand breaks and maintaining the genomic stability within the cell. The role of the MRN complex to recognize and process DNA double-strand breaks as well as signal other damage response factors is critical for maintaining proper cellular function. Mutations in any one of the components of the MRN complex that effect function or expression of the repair machinery could be detrimental to the cell and may initiate and/or propagate disease. Here, we discuss, in a structural and biochemical context, mutations in each of the three MRN components that have been associated with diseases such as ataxia telangiectasia-like disorder (ATLD), Nijmegen breakage syndrome (NBS), NBS-like disorder (NBSLD) and certain types of cancers. Overall, deepening our understanding of disease-causing mutations of the MRN complex at the structural and biochemical level is foundational to the future aim of treatin...

Arsenic poisoning through groundwater is the world's greatest normal groundwater catastrophe ... more Arsenic poisoning through groundwater is the world's greatest normal groundwater catastrophe which got an immense effect on worldwide general wellbeing. India is confronting the outcomes of arsenic poisoning in the zone of Ganga Brahmaputra alluvial plains. In Bihar out of 38 districts, 18 districts are exceptionally influenced with groundwater arsenic defilement. In the present study, we have assessed the current situation of arsenic exposure in Sabalpur village of Saran district of Bihar after reporting of breast, renal, skin and thyroid cancer cases from this village along with typical symptoms of arsenicosis. Such cancer patients were identified at our institute and were taken for the study. The present investigation deals with the quantification of arsenic in groundwater, hair and nail samples as well as the survey of entire village to know the overall health status of the village people. Altogether, 128 groundwater samples through handpumps, 128 human hair and nail samples...

The FASEB Journal, 2020

The MRE11, RAD50, and NBS1 genes encode the proteins of the Mre11–Rad50–Nbs1 (MRN) complex, which... more The MRE11, RAD50, and NBS1 genes encode the proteins of the Mre11–Rad50–Nbs1 (MRN) complex, which is critical for proper maintenance of genomic integrity. The MRN complex acts in DNA double‐strand break repair (DSBR) detection, repair, and signaling. Exo‐ and endonuclease activities of Mre11 may regulate the choice between non‐homologous end‐joining (NHEJ) versus homologous recombination (HR) repair pathways but the exact mechanism is still nebulous. Two Mre11 mutations have been previously described as separation of function mutants: P. furiosus (Pf) H85S is both exo‐ and endonuclease inactive while Pf Mre11 H52S is exonuclease inactive but endonuclease active. Here we describe a new separation of function mutant: Pf Mre11 Y187C, which is also exonuclease inactive and endonuclease active. We have examined the possible causes for the difference in activities in Pf Mre11 Y187C and for the separation of function phenotype in general. Nuclear Magnetic Resonance (NMR) spectroscopy shows...

IET Radar, Sonar & Navigation, 2019

IET Radar, Sonar & Navigation, 2018

Scientific Reports, 2018

Due to the substantial increase in the number of affordable drones in the consumer market and the... more Due to the substantial increase in the number of affordable drones in the consumer market and their regrettable misuse, there is a need for efficient technology to detect drones in airspace. This paper presents the characteristic radar micro-Doppler properties of drones and birds. Drones and birds both induce micro-Doppler signatures due to their propeller blade rotation and wingbeats, respectively. These distinctive signatures can then be used to differentiate a drone from a bird, along with studying them separately. Here, experimental measurements of micro-Doppler signatures of different types of drones and birds are presented and discussed. The data have been collected using two radars operating at different frequencies; K-band (24 GHz) and W-band (94 GHz). Three different models of drones and four species of birds of varying sizes have been used for data collection. The results clearly demonstrate that a phase coherent radar system can retrieve highly reliable and distinctive mi...

IET Radar, Sonar & Navigation, 2015

Range migration is a well-known, and readily compensable, phenomenon in synthetic-aperture radar.... more Range migration is a well-known, and readily compensable, phenomenon in synthetic-aperture radar. Under certain circumstances, it may also afflict phased array radar systems based on fixed antenna elements, but there is little or no literature on its occurrence in this type system, nor how it may be addressed. This study sets out to define the conditions in which range migration is a significant issue in phased array radar systems and how it may be mitigated, in particular concentrating on step frequency and frequency-modulated continuous-wave radar for which range migration is not so easily addressed. Results are presented to validate the approach based both on simulation and experimental data from ground-penetrating radar systems performing two-dimensional through-ice imaging in Antarctica.