http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Pankaj,Ashish Kumar,Manjeet Kumar,Rama Komaragiri 대한의용생체공학회 2023 Biomedical Engineering Letters (BMEL) Vol.13 No.4
Appropriate blood pressure (BP) management through continuous monitoring and rapid diagnosis helps to take preventivecare against cardiovascular diseases (CVD). As hypertension is one of the leading causes of CVDs, keeping hypertensionunder control by a timely screening of subjects becomes lifesaving. This work proposes estimating BP from motion artifactaffectedphotoplethysmography signals (PPG) by applying signal processing techniques in realtime. This paper proposes adeep neural network-based methodology to accurately classify PPG signals using a Fourier theory-based time–frequency(TF) spectrogram. This work uses the Fourier decomposition method (FDM) to transform a PPG signal into a TF spectrogram. In the proposed work, the last three layers of the pre-trained deep neural network, namely, GoogleNet, DenseNet, andAlexNet, are modified and then used to classify the PPG signal into normotension, pre-hypertension, and hypertension. Theproposed framework is trained and tested using the MIMIC-III and PPG–BP databases using five-fold training and testing. Out of the three deep neural networks, the proposed framework with the DenseNet-201 network performs best, with a testaccuracy of 96.5%. The proposed work uses FDM to compute the TF spectrogram to accurately separate the motion artifactsand noise components from a noise-corrupted PPG signal. Capturing more frequency components that contain moreinformation from PPG signals makes the deep neural networks extract better and more meaningful features. Thus, training adeep neural network model with clean PPG signal features improves the generalized capability of a BP classification modelwhen tested in realtime.
Kumar, Rajeev,Ghosh, Sankar Kumar,Verma, Akalesh Kumar,Talukdar, Anuradha,Deka, Monoj Kumar,Wagh, Mira,Bahar, H.M. Iqbal,Tapkire, Ritesh,Chakraborty, Kali Pankaj,Kannan, R. Ravi Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.16
Background: Esophageal squamous cell carcinoma (ESCC) is a common cancer in the north east of India. The present study concerned the prevalence of human papilloma virus (HPV) in the ESCC in north eastern India and its impact on response to chemotherapy. Materials and Methods: p16 expression, a surrogate marker for HPV infection was assessed in 101 pre-treatment biopsies of locally advanced ESCC, reported from a comprehensive cancer centre in north east India, using immunohistochemistry. All patients received neo-adjuvant chemotherapy. Response was assessed clinically and histopathologically with attention to p16 expression. Results: p16 was expressed in 22% of ESCC (22 out of 101) and was more prevalent in patients who were more than 45 years of age (P=0.048). p16 positive tumors appeared more commonly in the upper 2/3 of the thoracic esophagus (18 in 22). Nine of the 22 (41%) p16 positive tumors achieved pathologic complete response following neo-adjuvant chemotherapy (P=0.008). There was a trend towards reduced mortality in this group (P=0.048). Some 9 of the 20 (45%) patients who achieved pathologic complete response were p16 positive. Conclusions: Expression of p16 in ESCC correlates with higher rate of pathologic complete remission in patients undergoing neo adjuvant chemotherapy and could be a predictive marker for response assessment.
Morphological and electro-optical responses of dichroic polymer dispersed liquid crystal films
Pankaj Kumar,K.K. Raina 한국물리학회 2007 Current Applied Physics Vol.7 No.6
polymerization induced phase separation technique using nematic liquid crystal material in UV curable polymer NOA 65 and anthra-quinone dichroic dye. The eects of applied voltage and temperature on the LC droplet morphology and its optical characteristics werestudied in detail. Liquid crystal droplets containing low concentration of dye (6 0.25%) in polymer matrix exhibit bipolar conguration atlower applied voltage (6 10 V) whereas at relatively higher voltage (Plow concentration DPDLC lm shows better optical transmission and higher contrast ratio.
Pankaj V. Katariya,Subrata Kumar Panda,Chetan Kumar Hirwani 한국섬유공학회 2022 Fibers and polymers Vol.23 No.11
The large geometrical distortion effect on the skew sandwich panel and improvement of the eigenvalue responsesdue to the embedded functional material (shape memory alloy, SMA) is investigated for the first time in this research. Thestructural responses are numerically predicted via a macro-mechanical nonlinear finite element model with the alternatingelastic constants due to the change in environmental conditions. The nonlinear formulation is derived mathematically viathird-order deformation kinematics including the through-thickness elongations. Moreover, the large geometrical shapechanges of the skew sandwich shell panels are described by Green-Lagrange strain whereas the material nonlinearity due tothe functional fibre inclusion modelled through the step-wise temperature-dependent properties of the individual panelconstituents (face skins, core and SMA fibre). The proposed macro-mechanical material model is helping to evaluate thecomposite sandwich properties due to the variation of hygrothermal environment. The eigenvalue type of system equation isderived through variation principle with and without excess geometrical alteration and solved via the robust Picard’s iterationtechnique in association with nonlinear finite element steps. The marching technique is adopted to include the materialnonlinearity within the mathematical model to include the variation of SMA elastic properties (volume fraction, pre-strainand blocking stress). The viability of the proposed model to compute the responses are tested by checking a few examplesconsidering the curvature parameter, layer sequence, SMA layer and the environmental changes. Additionally, it is extendedto figure out the influences of individual and combined cases of parameters on the nonlinear frequency and bucklingcharacteristics of SMA bonded sandwich shell panel with and without skew angle.
PARTIAL REFLECTION AND TRAPPING OF A FAST-MODE WAVE IN SOLAR CORONAL ARCADE LOOPS
Kumar, Pankaj,Innes, D. E. IOP Publishing 2015 ASTROPHYSICAL JOURNAL LETTERS - Vol.803 No.2
<P>We report on the first direct observation of a fast-mode wave propagating along and perpendicular to cool (171 angstrom) arcade loops observed by the Solar Dynamics Observatory/Atmospheric Imaging Assembly (AIA). The wave was associated with an impulsive/compact flare near the edge of a sunspot. The EUV wavefront expanded radially outward from the flare center and decelerated in the corona from 1060 to 760 km s(-1) within similar to 3-4 minutes. Part of the EUV wave propagated along a large-scale arcade of cool loops and was partially reflected back to the flare site. The phase speed of the wave was about 1450 km s(-1), which is interpreted as a fast-mode wave. A second overlying loop arcade, orientated perpendicular to the cool arcade, is heated and becomes visible in the AIA hot channels. These hot loops sway in time with the EUV wave, as it propagated to and fro along the lower loop arcade. We suggest that an impulsive energy release at one of the footpoints of the arcade loops causes the onset of an EUV shock wave that propagates along and perpendicular to the magnetic field.</P>
Pankaj Kr. Sharma,Shashi Prakash Dwivedi,Ajay Kumar,Amit Kumar Sharma 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.6 No.3
In the present investigation an effort has been made to produce Al-Fly ash green composite using liquid state stir casting technique followed by green ultrasonic vibration such that it can improve wettability of fly-ash with aluminium by adding magnesium in the presence of argon gas. Addition of magnesium increases wettability of fly-ash particle in the molten aluminium and improves mechanical properties of Al-Fly ash green composite to a great extent. Incorporation of magnesium enhances the homogeneous allocation of fly ash particles in the pure aluminium alloy. More uniform distribution of Fly ash provides better mechanical properties. In this study, sample of Al/2 wt.% Mg/8 wt.% Fly ash provides most excellent outcome amongst all the selected composition. Microstructures show that the distribution of reinforcements is more uniform in this composition. TEM image shows proper wettability between aluminium and reinforcements. Density, cost estimation, hardness, toughness, ductility and tensile strength were also calculated to observe the result of magnesium and fly ash addition in aluminium matrix.
Pankaj Kumar Jha,Md. Golam Shahi Alam,Md. Abdullah Al Mansur,Mohammad Rafiqul Islam Talukder,Nazmun Naher,A K M Anisur Rahman,David C. Hall,Farida Yeasmin Bari 사단법인 한국동물생명공학회 2020 한국동물생명공학회지 Vol.35 No.2
The effects of the number of frozen-thawed ram sperm per single and double intra-cervical artificial insemination (AI) on fertility in ewes were studied. A total of 89 non-pregnant ewes were synchronized for oestrus with two doses of 100 μg PGF2α (Cloprostenol) 9 days apart. The ewes were randomly assigned to one of four groups; D200 (n = 23; double AI with 200 × 106 sperm), S200 (n = 24; single AI with 200 × 106 sperm), D100 (n = 24; double AI with 100 × 106 sperm) and S100 (n = 18; single AI with 100 × 106 sperm). Ewes were inseminated within 12 to 18 h for single AI and, within 10 to 12 h and 16 to 18 h for double AI after the onset of oestrus. The onset of oestrus ranged from 28 to 76 h (54.33 ± 1.28 h). The high percentage (29.2%) of ewes showed oestrus between 51 to 60 h. The non-return rates were highest in group D200 (56.5%) and differed significantly (p < 0.05) from group S100 (11.1%). No ewes were pregnant in group S100, and the pregnancy rates among the remaining groups did not differ. The mean gestation period was 152.8 ± 0.5 days and no difference was observed among the groups. The lambing and multiple birth rates were 100% in group D200. The single and twin lambing was highest in group D100 (33.3%) and group D200 (83.3%), respectively. Only one triplet lambing and the highest lambing size (2.2 ± 0.2) was recorded in group D200. In conclusion, double AI with 200 × 106 sperm showed comparatively most practical for achieving high pregnancy rates and lambing performances in Bangladeshi ewes under field conditions.