Paraplegia Following Spinal Cord Contusion from an Indirect Gunshot Injury

Khuram Khan,Beatrice Dieudonne,Saqib Saeed,Sara Alothman,Yasir Saeed,Sanjiv Gray,Khuram Khan 대한신경손상학회 2018 Korean Journal of Neurotrauma Vol.15 No.1

Spinal cord injuries are debilitating and life threatening. Paraplegia due to direct traumatic gunshot injury to the spinalcord is common. The most common cause of spinal cord injury is road traffc accidents. This is followed by spinal cord injury due to a fall from a height. Most of the spinal cord injuries due to gunshot wounds occur as a result of direct traumatic effects. We present a rare case of a 49-year-old male with trauma. He developed paraplegia after a gunshot wound injuryto the neck and contusion to the spinal cord, with no direct trauma. Paraplegia due to direct gunshot injury can have manydifferent outcomes. In our case, the patient was managed conservatively, and the outcome was favorable

Fuzzy logic model for the prediction of concrete compressive strength by incorporating green foundry sand

Khuram Rashid,Tabasam Rashid 사단법인 한국계산역학회 2017 Computers and Concrete, An International Journal Vol.19 No.6

This work is conducted with the aim of using waste material to reserve the natural resources. The objective is accomplished by conducting experimentation and verify by modeling based on fuzzy logic. In experimentation, concrete is casted by using natural/river sand as fine aggregate and termed as control specimen. Natural sand is conserved by replacing it with used foundry sand (UFS) by an amount of 10, 20 and 30% by weight. Fresh and hardened properties of concrete are investigated at different ages. It is observed that compressive strength and modulus of elasticity reduced with the increase in amount of UFS. Furthermore, concrete compressive strength is predicted by using fuzzy logic model and verified at different replacement ratio and age with experimental observations.

Performance enhancement and energy reduction using hybrid cryogenic distillation networks for purification of natural gas with high CO2 content

Khuram Maqsood,Saibal Ganguly,Jayita Pal,Dhanaraj Turunawarasu,Anindya Jyoti Pal 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.7

A novel concept of hybrid cryogenic distillation network has been explored which maximizes the benefitsof both desublimation or solid-vapor based separation as well as distillation or vapor-liquid equilibrium based separationduring the separation of carbon dioxide from methane or natural gas. Process network synthesis has been performedfor four case studies with high carbon dioxide (72 mole%) and medium carbon dioxide (50 mole%) natural gas feedstreams. The benefits of optimal locations for cryogenic packed beds were investigated. A conventional cryogenic networkconsisting of multiple distillation columns with butane as additive for extractive distillation was also studied andpresented in this paper. Process modeling of cryogenic distillation network with MESH equations was attempted usingan integrated dual loop (C+3) convergence and the results were compared with Aspen Plus simulator for benchmarking. The prediction of solidification region was employed using experimental data from literature to avoid solidificationregions in the column. The proposed hybrid cryogenic distillation network showed promising potential for energy andsize reduction.

Optical thermometry probe via fiber containing β-NaLuF4:Yb3+/Er3+/ Tm3+

Muhammad Khuram Shahzad,Yundong Zhang,Muhammad Usman Khan,Harse Sattar,Muhammad Ikram 한국물리학회 2019 Current Applied Physics Vol.19 No.6

In this article, β-NaLuF4:Yb3+/Tm3+/Er3+ were synthesized by thermal decomposition technique. Yb3+/Tm3+/ Er3+ has been firstly manifested to fabricate the microfibers after co-doping with polymer solution. The guiding performance of a microfiber was observed under 980 nm excitation source to prove that it could be used as an active and passive waveguides. The characteristics of optical thermal sensing of Tm3+ and Er3+ ions in a single microfiber were demonstrated. The FIR method was utilized to evaluate the sensitivity of a single microfiber and maximum sensitivity of activator ions in a microfiber was achieved as 0.00124 and 0.00311 K-1 with temperature ranging from 303 to 363 K, respectively. Our results suggest that a single microfiber has good sensing stability and has potential applications in the field of thermometry.

Appraisal of geopolymer lightweight aggregates sintered by microwave radiations

Nimra Saleem,Khuram Rashid,Noor Fatima,Sadia Hanif,Ghinwa Naeem,Aamna Aslam,Miral Fatima,Kiran Aslam 아시아콘크리트학회 2020 Journal of Asian Concrete Federation Vol.6 No.2

This work was designed for the production of geopolymer based lightweight aggregate (LWA) using industrial by-products. Combination of fly ash (FA) and silica fume (SF) were used as precursors, whereas, combination of sodium hydroxide and sodium silicate were used as activator. Small amount of sodium bicarbonate was also used for surface hardening and early strength development. Pellets of dif-ferent sizes were crafted manually and cured by microwave radiations just for 5 minutes. The physico-mechanical properties of produced pellets (LWA) were discussed in light of: morphology, density, water absorption, specific gravity, porosity, aggregate impact value, and particle crushing strength. The prop-erties of LWA were also compared with literature reported synthetic LWAs cured with different tech-niques. The water absorption and specific gravity of LWAs were within the specified range provided by ACI standard. Mechanical strength properties briefed that the produced LWAs were strong enough to resist compressive load comparable to natural LWAs and many other synthetic LWAs. Thus, proposed curing method, microwave irradiation, has been found to be a sustainable and fast curing technique than conventional energy-intensive curing regimes. The results also confirmed that produced LWAs have po-tential to replace natural LWAs both in cast-in-place and precast concrete elements with possible eco-nomic, environmental, and technical benefits.

Low Noise, Low Power 5-channel Sonar Signal Conditioning Receiver with 1.5 MS/s - 12.5 MS/s 16-bit Sigma-delta ADC for Ocean Acoustic Measurements

Jong-Wan Jo,Khuram Shehzad,Deeksha Verma,Sung Jin Kim,Young-Woo Park,Kwan-Tae Kim,Sang-Yun Kim,YoungGun Pu,Young-Goo Yang,Keum Cheol Hwang,Dong-Hun Lee,Hyung-Moon Kim,Kang-Yoon Lee 대한전자공학회 2020 Journal of semiconductor technology and science Vol.20 No.4

This paper presents the design of a 5-channel receiver for ocean acoustic measurement in very noisy environments. When measuring distances in the ocean through sonar, the input signal level to the receiver can change drastically depending on the distance between the transmitter and objects. Thus, a receiver with low sensitivity and a wide dynamic range is proposed in this work. In order to minimize the Input-Referred (IR) noise for the high sensitivity of the receiver, a low noise pre-amplifier is proposed and implemented, ultimately achieving a noise of 29.6 nV/√Hz at 50 kHz. In addition, a Sigma-Delta Analog-to-Digital Converter (SD ADC) with variable sampling rates is proposed by using the clock splitting technique in the Sigma-Delta Modulator (SDM) core. In addition, the decimation factor of the digital filter placed after the SDM in the SD ADC can be controlled so as to reduce the power consumption. Through the use of these techniques in the SD ADC, we can implement reconfigurable sampling rates from 1.5 MS/s to 12.5 MS/s with low power consumption. In order to overcome the limitation of the number of pins for multi-channel application, a Parallel-to-Serial (P2S) interface is proposed and designed in the receiver. The 5-channel receiver in this paper is implemented in a 0.18 μm CMOS process and the die area is 14.44 mm2. The total power consumption of this chip under a supply voltage of 2.4 V is 46.8 mW. The measured sensitivity and dynamic range are -100 dBV and 100 dB, respectively. The measured SNDR at the output of the SD ADC is 82.02 dB when the input signal frequency and sampling frequency are 7 kHz and 6.25 Msps, respectively. The maximum phase error between five channels is measured to be 0.8 °.

Reference Voltage Generator를 이용한 저전력 10-bit SAR ADC

강진호(Jin-ho Kang),Khuram shehzad,이강윤(Kang-Yoon Lee) 대한전자공학회 2020 대한전자공학회 학술대회 Vol.2020 No.8

Design of a low noise analog Front-End System for Sonar Signal Conditioning Receiver

조종완,김성진,Muhammad Riaz ur Rehman,Khuram Shehzad,박영우,YoungGun Pu,이동헌,김형문,이강윤 한국과학기술원 반도체설계교육센터 2020 IDEC Journal of Integrated Circuits and Systems Vol.6 No.1

This paper presents the design of a low noise analog front end system for sonar signal conditioning receiver with Parallel to Series Interface in very noisy environments. When measuring distances in the ocean through sonar, the input signal level to the receiver can change drastically depending on the distance between the transmitter and objects. Thus, a receiver with low sensitivity and a wide dynamic range is proposed in this work. In order to minimize the Input-Referred (IR) noise for the high sensitivity of the receiver, a low noise pre-amplifier is proposed and implemented, ultimately achieving a noise of 11 nV/√Hz at 50 kHz. The decimation factor of the digital filter placed after the SDM in the SD ADC can be controlled so as to reduce the power consumption. Through the use of these techniques in the SD ADC, we can implement reconfigurable sampling rates from 1.5 MS/s to 12.5 MS/s with low power consumption. In order to overcome the limitation of the number of pins for sensor application, a Parallel-to-Serial (P2S) interface is proposed and designed in the receiver. The Low Noise receiver in this paper is implemented in a 0.18 μm CMOS process and the die area is 14.44 mm2. The total power consumption of this chip under a supply voltage of 2.4 V is 46.8 mW. The measured sensitivity and dynamic range are -100 dBV and 100 dB, respectively. The measured SNDR at the output of the SD ADC is 82.02 dB when the input signal frequency and sampling frequency are 7 kHz and 6.25 Msps, respectively.

The Role of Islamic Work Ethics in Spiritual Leadership and Inclusion Practices Relationship During COVID-19

AHMAD, Uqba Saeed,NAWAB, Samina,SHAFI, Khuram Korea Distribution Science Association 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.3

The Covid-19 pandemic situation has changed all medical priorities. This has put pressure on the World's health sector, which also affects the economy of the whole world. This study aims to study how Islamic work ethics affects the relationship between spiritual leadership and organizational inclusion practices in the health care sector of Pakistan in the COVID-19 situation. This is a mix-method study. Data collected of 158 practicing doctors through survey-based questionnaire and interview was conducted from 30 doctors dealing with direct coronavirus. The organizational inclusion practices variable is used for the first time in a quantitative approach in this study. The reliability and validity of organizational inclusion practices are checked by Adanco, SPSS, and SmartPLS software. For this purpose, data on inclusion practices was also collected from the banking and education sector. Results show that spiritual leadership significantly relates to Islamic work ethics also has a positive connection between spiritual leadership and organizational inclusion practices. Still, Islamic work ethics as a moderator has an insignificant impact on the relationship between spiritual and organizational inclusion practices. Also, from the result, it is verified that the organizational inclusion practices variable is valid and reliable for further studies.

A Comprehensive Review on High-efficiency RF-DC Converter for Energy Harvesting Applications

Muhammad Basim,Qurat ul Ain,Khuram Shehzad,Syed Adil Ali Shah,Azam Ali,ByeongGi Jang,YoungGun Pu,Joon-Mo Yoo,Kang-Yoon Lee 대한전자공학회 2022 Journal of semiconductor technology and science Vol.22 No.5

The design of radiofrequency energy harvesting (RFRH) circuit for wearable devices, wireless sensor networks, and IoT applications can be classified mainly into radio frequency to direct current (RF-DC) converter, a transmitter and receiver antenna, an impedance matching network, and a storage device or a load. By scavenging RF energy from the ambient environment, this developing technology allows low-power wireless devices to be self-sustaining and environment friendly. To eliminate the need for batteries, RFEH technology has become a dependable and promising alternative for extending the lifetime of power-constrained wireless networks. This paper mainly focused on the input and output power, Power conversion efficiency (PCE), and sensitivity. Due to the weak and limited signal strength of received RF power, high-efficiency state-of-the-art RF energy harvesters must be designed to provide sufficient DC supply voltage to wireless networks. We provide in-depth information on the system's parameters. Optimum efficiency and maximum output power are the main concerns of an RFEH system. Therefore, RF Energy harvesting system review, antenna design, impedance matching, and RF-DC converter are presented in this paper to provide a deep insight into the design of the RFEH system. This article may help in identifying new research in the field of RF Energy Harvesting.