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Estimation of Surgical Needle Insertion Force Using Kalman Filter
Syed Riaz un Nabi Jafri,Ali Jamshaid,Syed Minhaj un Nabi Jafri,Jamshed Iqbal 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.2
This paper presents a novel low-cost technique to measure the insertion force of a surgical needle on a testing surface to check needle strength. A combination of a load cell with a current sensor for a linear DC motor has been used to estimate the insertion force based on Kalman Filter (KF). The custom-designed and in-house fabricated system to estimate the insertion force comprises of the motor coupled with a vertically articulated arm. The needle to be tested is mounted at the end of the arm. Movement of the arm has been controlled electronically to produce the insertion force by the needle to a testing surface. The sensory measurement data generated during this process has been collected using Arduino based embedded electronic hardware. The KF based proposed strategy has been validated using the developed system by conducting various tests with diferent needles. Results in the form of penetration force and friction force have been experimentally observed and are then compared with standard force meters. Comparative analysis witnesses efciency of the proposed approach.
A Survey of Face Recognition Techniques
Jafri, Rabia,Arabnia, Hamid R. Korea Information Processing Society 2009 Journal of information processing systems Vol.5 No.2
Face recognition presents a challenging problem in the field of image analysis and computer vision, and as such has received a great deal of attention over the last few years because of its many applications in various domains. Face recognition techniques can be broadly divided into three categories based on the face data acquisition methodology: methods that operate on intensity images; those that deal with video sequences; and those that require other sensory data such as 3D information or infra-red imagery. In this paper, an overview of some of the well-known methods in each of these categories is provided and some of the benefits and drawbacks of the schemes mentioned therein are examined. Furthermore, a discussion outlining the incentive for using face recognition, the applications of this technology, and some of the difficulties plaguing current systems with regard to this task has also been provided. This paper also mentions some of the most recent algorithms developed for this purpose and attempts to give an idea of the state of the art of face recognition technology.
A comparative study of paper-based microfluidic devices with respect to channel geometry
Jafry, A.T.,Lim, H.,Kang, S.I.,Suk, J.W.,Lee, J. Elsevier 2016 Colloids and surfaces. A, Physicochemical and engi Vol.492 No.-
<P>Since 2007, the world of microfluidics saw an emergence of a new era of low cost, simple, quick fabrication, abundantly available, and environmentally friendly microfluidic paper-based analytical devices (PADs) capable of clinical diagnostics, food quality control as well as environmental monitoring. Although many fabrication techniques have evolved as a result of its broad application spectrum and ease of use, the technology has still barely scratched the surface of its potential in terms of its underlying fundamental principle, i.e., fluid flow analysis. In this study, we report the comparison of flow profile attained by using two of the most promising techniques of photolithography and wax printing from a hydrodynamic point of view. A modified protocol for synthesizing an epoxy based negative photoresist (SU-8) channel and wax-based channel was created by optimizing a few process parameters of our equipment. Water and oil (oleic acid) are selected as the hydrophilic and hydrophobic fluids, respectively, and their flow was analyzed in straight channels using a paper device. A new approach to vary the flow velocity is described in detail involving cylindrical dots as the resistance inside the paper channel. Observing the length-time curve for the two fluids, it becomes evident that both follow the Lucas-Washburn equation if the width of the channel is large enough. Various configurations of dots indicate that different longitudinal flow velocity implying its application in simultaneous addition of chemicals without the need to change the channel width or length. (C) 2016 Elsevier B.V. All rights reserved.</P>
Jafry, Ali Turab,Lee, Hyungdong,Tenggara, Ayodya Pradhipta,Lim, Hosub,Moon, Youngkwang,Kim, Seung-Hyun,Lee, Yongwoo,Kim, Sung-Min,Park, Sungsu,Byun, Doyoung,Lee, Jinkee Elsevier 2019 Sensors and actuators. B Chemical Vol.282 No.-
<P><B>Abstract</B></P> <P>Double-sided electrohydrodynamic jet printing of circuitry using silver nanowires (AgNWs) and dispensing of high viscosity silver nanoparticles (AgNPs) is demonstrated for the first time in the fabrication of a two-dimensional array of electrodes (3D circuitry) on a single sheet of paper. The penetration of AgNW ink through the paper’s thickness by capillary imbibition allows for multilayer electrical access to connect the individual electrodes. This makes it an automated and efficient choice as the functional area of the device is conserved and the surface of the paper is preserved. This allows for two-dimensional droplet manipulation on a paper-based digital microfluidics (PBDMF) platform. Compared to printed circuit board technology, paper-based electronics offer a range of desirable properties: they are light weight, portable, economical, flexible, biodegradable, and the materials are abundantly available. The fabricated PBDMF chip is demonstrated to be a low-cost, fully reconfigurable, and disposable point-of-care diagnostic platform for the environmental sensing of pesticide using organophosphorus hydrolase enzyme through colorimetric detection via smartphone.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Silver nanowires penetrated through paper’s thickness for making 3D interconnects. </LI> <LI> High viscosity silver nanoparticles dispensed on paper reveal no penetration. </LI> <LI> 3D circuitry in single sheet of paper printed using double-sided EHD jet printing. </LI> <LI> Two-dimensional droplet actuation achieved on a paper-based digital microfluidics. </LI> <LI> Cellphone-based colorimetric detection of methyl paraoxon from 10 to 100 μM concentration. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Lena Jafri,Hafsa Majid,Sibtain Ahmed,Imran Siddiqui,Farooq Ghani,Aysha Habib Khan 대한진단검사의학회 2019 Laboratory Medicine Online Vol.9 No.4
An observational study was conducted at the Section of Clinical Chemistry, Department of Pathology and Laboratory Medicine, to assess the iodine status using the World Health Organization (WHO), United Nations International Children's Emergency Fund (UNICEF), and the International Council for Control of Iodine Deficiency Disorders (ICCIDD) consensus criteria, which state that >3% prevalence of serum thyroid stimulating hormone (TSH) ≥10 mIU/L in the population is an indicator of iodine deficiency. Serum neonatal TSH was analyzed from January to December 2013. In a period of one year, a total of 11,597 neonates with the mean (25 percentile, 75 percentile value) age of 2.0 days (0.5–3.5) were tested for serum TSH. The overall mean TSH level was 3.38 mIU/L (5.63–1.96), with optimal levels (1–39 mIU/L) in 93%, <1 mIU/L in 6.3%, and ≥40 mIU/L in 0.3% neonates. Of all the neonates, 7.9% (N=916) showed TSH ≥10 mIU/L which is higher than the recommended WHO/UNICEF/ICCIDD criteria for mild endemicity for iodine deficiency in the population. These results suggest that iodine deficiency is still prevalent in our population, indicating a need for effective intervention programs and increasing awareness regarding the use of iodized salt and supplementation in all reproductive-aged women to prevent iodine deficiency in neonates.
Muhamad Jafri,Jefri S. Bale,Alionvember R. Thei 한국유체기계학회 2020 International journal of fluid machinery and syste Vol.13 No.3
The purpose of this study was to analyze the effect of waste valve and the delivery valve diameter on the 3-inch hydraulic ram efficiency. The waste valve is one important component of the hydraulic ram. The results showed that the diameter of the waste and delivery valves greatly affect the efficiency of hydraulic ram. The highest D’Aubuisson efficiency was 67.66% with the waste valve diameter of contained 2.75 inches and the in the waste valve variation of 2.75 inches diameter and delivery valve diameter of 2 2 inches. The lowest efficiency was 36.14% with the waste valve diameter of 2.25 inches and the delivery valve diameter of 0.6 inches.