Current updates in acute traumatic aortic injury: radiologic diagnosis and management

Shivani Gupta,Atin Kumar,Tejinder Kaur,Shivanand Gamanagatti,Abhinav Kumar,Amit Gupta,Subodh Kumar 대한응급의학회 2022 Clinical and Experimental Emergency Medicine Vol.9 No.2

Acute traumatic aortic injuries, which have substantial lethal outcomes at the time of admission, are fatal in 80% to 90% of cases. These injuries are relatively rare and have nonspecific clinical presentations. Radiologists and emergency physicians need to identify the radiological signs of acute traumatic aortic injury and differentiate them from common imaging errors to ensure accurate diagnosis and determine appropriate management protocols. In combination with image-guided interventions, advances in cross-sectional imaging have enabled nonsurgical management of acute traumatic aortic injuries. Timely and precise diagnoses of these injuries following prompt treatment are essential as up to 90% of patients presenting at the hospital can undergo early repair.

Seismic Fragility of Steel Piping System Based on Pipe Size, Coupling Type, and Wall Thickness

주부석,Abhinav Gupta,류용희 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.4

In this study, a probabilistic framework of the damage assessment of pipelines subjected to extreme hazard scenario was developed to mitigate the risk and enhance design reliability. Nonlinear 3D fi nite element models of T-joint systems were developed based on experimental tests with respect to leakage detection of black iron piping systems, and a damage assessment analysis of the vulnerability of their components according to nominal pipe size, coupling type, and wall thickness under seismic wave propagations was performed. The analysis results showed the 2-inch schedule 40 threaded T-joint system to be more fragile than the others with respect to the nominal pipe sizes. As for the coupling types, the data indicated that the probability of failure of the threaded T-joint coupling was signifi cantly higher than that of the grooved type. Finally, the seismic capacity of the schedule 40 wall thickness was weaker than that of schedule 10 in the 4-inch grooved coupling, due to the diff erence in the prohibition of energy dissipation. Therefore, this assessment can contribute to the damage detection and fi nancial losses due to failure of the joint piping system in a liquid pipeline, prior to the decision-making.

Edge-Directed Error Diffused Digital Halftoning : A Steerable Filter Approach

Pardeep Garg,Abhinav Gupta,M.C. Srivastava,Ankur Gupta,Nikunj Agarwal 보안공학연구지원센터(IJSIP) 2009 International Journal of Signal Processing, Image Vol.2 No.3

A Reconciliation of Experimental and Analytical Results for Piping Systems

Yong Hee Ryu,주부석,Abhinav Gupta,정우영 한국강구조학회 2016 International Journal of Steel Structures Vol.16 No.4

This paper is focused on developing experimentally validated models of piping components as well as a complete two story piping system. The damage in a piping system is characterized in terms of “First Leakage” based on the observations made in laboratory experiments. Monotonic and cyclic testing for pipe components of various sizes shows that the limit-state for leakage is governed predominantly by flexural deformations at the threaded and groove fit T-joints. As a first step in the validation process, the nonlinear models for the flexural behavior of T-joints are reconciled with the experimental results. Next, the validated component models are incorporated in the piping model for a two story sprinkler system. The system level piping model is then integrated with ceiling systems that interact with sprinkler heads. The complex piping ceiling system model is validated by comparison with the corresponding experimental data.

The effects of construction related costs on the optimization of steel frames

Choi, Byoung-Han,Gupta, Abhinav,Baugh, John W. Jr. Techno-Press 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.43 No.1

This paper presents a computational study that explores the design of rigid steel frames by considering construction related costs. More specifically, two different aspects are investigated in this study focusing on the effects of (a) reducing the number of labor intensive rigid connections within a frame of given geometric layout, and (b) reducing the number of different member section types used in the frame. A genetic algorithm based optimization framework searches design space for these objectives. Unlike some studies that express connection cost as a factor of the entire frame weight, here connections and their associated cost factors are explicitly represented at the member level to evaluate the cost of connections associated with each beam. In addition, because variety in member section types can drive up construction related costs, its effects are evaluated implicitly by generating curves that show the trade off between cost and different numbers of section types used within the frame. Our results show that designs in which all connections are considered to be rigid can be excessively conservative: rigid connections can often be eliminated without any appreciable increase in frame weight, resulting in a reduction in overall cost. Eliminating additional rigid connections leads to further reductions in cost, even as frame weight increases, up to a certain point. These complex relationships between overall cost, rigid connections, and member section types are presented for a representative five-story steel frame.

The effects of construction related costs on the optimization of steel frames

Byoung-Han Choi,Abhinav Gupta,John W. Baugh Jr. 국제구조공학회 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.43 No.1

This paper presents a computational study that explores the design of rigid steel frames by considering construction related costs. More specifically, two different aspects are investigated in this study focusing on the effects of (a) reducing the number of labor intensive rigid connections within a frame of given geometric layout, and (b) reducing the number of different member section types used in the frame. A genetic algorithm based optimization framework searches design space for these objectives. Unlike some studies that express connection cost as a factor of the entire frame weight, here connections and their associated cost factors are explicitly represented at the member level to evaluate the cost of connections associated with each beam. In addition, because variety in member section types can drive up construction related costs, its effects are evaluated implicitly by generating curves that show the trade off between cost and different numbers of section types used within the frame. Our results show that designs in which all connections are considered to be rigid can be excessively conservative: rigid connections can often be eliminated without any appreciable increase in frame weight, resulting in a reduction in overall cost. Eliminating additional rigid connections leads to further reductions in cost, even as frame weight increases, up to a certain point. These complex relationships between overall cost, rigid connections, and member section types are presented for a representative five-story steel frame.

Intelligent control of robotic manipulators: a comprehensive review

Devendra Rawat,Mukul Kumar Gupta,Abhinav Sharma 대한공간정보학회 2023 Spatial Information Research Vol.31 No.3

Technological advancements in robotics significantly impact the design of robotic manipulators and their control. Manipulators find applications in electrical, mechanical, and process industries to reduce labor and improve accuracy. Controlling manipulators is challenging because of their complex dynamics and nonlinear properties. Researchers are exploring many ways to implement the effective control method, including classical and modern techniques. In all the applications, robotic manipulators interact with the real world. Therefore, they require an understanding of input–output relations, which raises the need for intelligent control methods. The revolutionized growth in artificial intelligence has significantly influenced robotic manipulators' control. This paper presents a detailed review of intelligent control techniques implemented on robotic manipulator systems. These intelligent control methods include artificial neural networks, fuzzy logic control, expert systems, metaheuristic algorithm, machine learning control, etc. These intelligent methods for robotic manipulators have gained more attention because they emulate human intelligence, which finds application in diverse fields of science and engineering. In this paper, authors have investigated and compared metaheuristic algorithm and their application in robotic manipulators.

Human Leukocyte Antigen-DQ Genotyping in Pediatric Celiac Disease

Stuti Pareek,Raj Kumar Gupta,Abhinav Sharma,Sandhya Gulati 대한소아소화기영양학회 2023 Pediatric gastroenterology, hepatology & nutrition Vol.26 No.1

Purpose: The purpose of this study was to determine the pattern of human leukocyte antigen (HLA)-DQ genotype in children diagnosed with celiac disease (CD) (biopsy proven), and to compare this with a control group; and secondarily, to correlate HLA genotypes with clinical profiles of CD. Methods: This cross-sectional comparative observational study included 26 controls and 52 patients diagnosed with CD who presented at Sir Padampat Mother and Child Health Institute, Jaipur, from May, 2017 to October, 2018. HLA DQ genotype was assessed for each patients and correlated with clinical profiles. Results: HLA DQ2/DQ8 genotypes were significantly more common in CD (present in 100.0% cases) than in controls (23.1%) in Northern India (Rajasthan). When HLA DQ2.5 and DQ8 were present together, individuals had significantly more atypical presentations and severe findings on duodenal biopsy. Similarly, patients with the HLA DQ 2.5 genotype were also predisposed to more severe endoscopic findings, while HLA DQ2.2 predisposed them to less severe biopsy findings. HLA DQ8 was significantly associated with later age at diagnosis (>5 years) and shorter stature. The highest HLA DQ relative risk (RR) for CD development was associated with HLA DQ2.5 and DQ2.2 in combination, followed by HLA DQ2.5 and DQ8 in combination, while HLA DQx.5 and HLA DQ2.2 together had the lowest risk. Conclusion: HLA DQ2/DQ8 genotypes are strongly associated with pediatric CD patients in northern India. These genotypes and their combinations may be associated with different clinical presentations of CD, and may help predict severity of CD.

Intra-Operative Frozen Sections: Experience at A Tertiary Care Centre

Preeti, Agarwal,Sameer, Gupta,Kulranjan, Singh,Abhinav, Sonkar Arun,Preeti, Rani,Sunita, Yadav,Mati, Goel Madhu Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.12

The present study was conducted to assess error rates with diagnosis using intra-operative frozen sections, and to indicate ways to increase overall performance. Over a period of two years, 227 cases were biopsied intra-operatively. Errors were observed in 14 cases. Four of these were sampling errors, one by a pathologist and three by surgeons. In seven cases incorrect interpretations were made. Epithelial dysplasia was observed on definitive histology in two cases which was not reported intra-operatively. One case was of ectopic thyroid. In cases of oral cancer where sentinel lymph nodes were sampled, immunohistochemistry for cytokeratin was performed to facilitate identification of micrometastasis. Only single case displayed tumor deposits which was not evident morphologically. Resection margins were reported in seventy eight cases. Some 18% (14/50) benefited from revision of margins; overall sensitivity of intra-operative frozen sections for marginal status was 71.4%, with a specificity of 90.3%. Overall sensitivity was 75% and specificity was 97.5%. Careful observation, pathologist experience and knowledge of limitations help in improving the overall diagnostic outcome.

A Closed-Form Solution to Characterize the Behavior of Piping T-Joints

Ankit R. Dubey,Abhinav Gupta,Sung Gook Cho 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.4

The performance characterization of a critical component like T-joints in piping systems for the purposes of fragility assessment requires experimental data. The component level experimental data is limited to specific thicknesses and diameters of the specimen used. Therefore, the experimentally obtained empirical models for incorporation into the simulation study cannot be extended directly to the different thickness and diameter of the pipe. This is a fundamental drawback in developing empirical models using the experimental data directly. Conducting multiple experiments for different pipe properties can be quite costly and impractical. Therefore, there is a need to incorporate a closed-form solution which can exhibit a reasonable reconciliation between the experimental and simulation data. A closed-form solution, which represents the behavior of a T-joint as a function of geometrical properties of the pipe, can also pave the way to account for degradation mechanism. This manuscript presents a new approach to characterize T-joint behavior through a closed-form solution. A closed-form solution can characterize T-joint behavior in a generalized form that allows assessment of the effect of pipe thicknesses on the T-joint behavior.