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Oil-price, inflation pass-through: Are there some known, unknowns?
Sarfaraz Ali Shah SYED 한양대학교 경제연구소 2018 JOURNAL OF ECONOMIC RESEARCH Vol.23 No.3
The study revisits the oil price and inflation nexus in 18 emerging market economies. We bring new evidence by studying this relationship using the disaggregated inflation data, (the headline inflation and the four major inflation sub-groups including core inflation, food inflation, fuel inflation and housing inflation). Using mixed frequency data sampling (MIDAS) regression, the study explains the oil price shock transmission mechanism, where food group plays an important role in translating the immediate incidence of the shock. Our out-of-sample forecasts strongly support the prediction power of MIDAS over VEC model, for headline CPI inflation and CPI subgroups inflation.
Numerical analysis of heat transfer in human head
Sarfaraz Kamangar,Mohammad Anas Khan,Irfan Anjum Badruddin,T. M. Yunus Khan,Nik. Ghazali. N 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.7
An investigation of heat transfer in human head is carried out by using finite element method. The head is modeled with different tissues having varying physical properties. The current work is focused to simulate the effect of various physical and geometrical parameters such as ambient temperature, heat transfer coefficient and variation in the thickness of different tissue layers of human head. The effect of presence of hair on human head is also investigated. It is found that the deep brain temperature remains almost constant whereas a small variation occurs in the other layers with respect to varying environmental and geometrical parameters.
Sarfaraz, Ifrah,Pascoal, Selma,Macedo, Jose Paulo,Salgado, Abel,Rasheed, Dil,Pereira, Jorge The Korean Dental Society of Anesthsiology 2021 Journal of Dental Anesthesia and Pain Medicine Vol.21 No.4
This review aimed to assess and compare the outcomes of the anesthetic efficacy of inferior alveolar nerve block (IANB) and Gow-Gates mandibular nerve block (GGMNB) in patients with symptomatic irreversible pulpitis. A descriptive systematic review of quantitative research was conducted wherein the "Preferred Reporting Items for Systematic Reviews (PRISMA)" was adopted, and the Problem/Patient/Population, Intervention/Indicator, Comparison, Outcome (PICO) criteria were used to structure the research question. A literature search was performed using PubMed/Medline, Cochrane Library, Google Scholar, and Ovid. Selection criteria were applied for populations over nine years of age, of either sex, with irreversible pulpitis, and articles published in English regarding conventional IANB or IANB and Gow-Gates techniques between 2009 and 2019. Prospective randomized clinical trials or randomized controlled trials were included in the review, in which anesthetic efficacy or success was measured. After screening, four articles were included. Three studies were randomized clinical trials, and two were randomized controlled trials. The validity and reliability of the individual studies were examined. There was evidence of the higher efficacy of the GGMNB technique than that of the IANB technique. However, both techniques can be mastered through training.
Stochastic upscaling via linear Bayesian updating
Sarfaraz, Sadiq M.,Rosic, Bojana V.,Matthies, Hermann G.,Ibrahimbegovic, Adnan Techno-Press 2018 Coupled systems mechanics Vol.7 No.2
In this work we present an upscaling technique for multi-scale computations based on a stochastic model calibration technique. We consider a coarse-scale continuum material model described in the framework of generalized standard materials. The model parameters are considered uncertain, and are determined in a Bayesian framework for the given fine scale data in a form of stored energy and dissipation potential. The proposed stochastic upscaling approach is independent w.r.t. the choice of models on coarse and fine scales. Simple numerical examples are shown to demonstrate the ability of the proposed approach to calibrate coarse scale elastic and inelastic material parameters.
Finite element analysis of strength enhancement of open-cell aluminum foam with hollow struts
아메드 사르파라즈(Ahmed Sarfaraz),왕나(Na Wang),이상교(Sang-kyo Lee),조종두(Chongdu Cho) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The strength enhancement of open -cell aluminum foam with hollow struts has been studied through finite element method using three dimensional, periodic unit cells models for solid and hollow struts of open-cell aluminum foam under compressive uniform load. The stress behavior and deformation of these models has been analyzed at constant relative density. The results show that open-cell foam with hollow struts has better strength than the solid strut model. The simulated results are compared with other analytical published data and it shows good agreement.
Failure Analysis of Vital Sign Monitoring System in Digital Healthcare with FTA
Faiza Sabir,Sarfaraz Ahmed,권기현 한국멀티미디어학회 2023 The journal of multimedia information system Vol.10 No.3
Digital healthcare system requires safety critical software and more attention among human perception and assistance of computer. Appar-ently, it becomes serious challenge for engineers and doctors in assuring the secure and reliable healthcare system. The main target is patient safety here, thus important factor to consider in healthcare is system protection. In recent research vital signs such as heart rate (HR) and breathing rate (BR) are extracted using a non-invasive IR-UWB radar sensor. Hence, safety of the contact-less device is necessary for proper and accurate measurement of HR and BR in digital healthcare system. Therefore, in our research we drawn and performed fault tree analysis (FTA) of such system which analyze potential hazards of measuring subject’s HR and BR in a non-contact fashion. We emphasize on crucial issues and safety factors which are important in patient safety and protection before the proper deployment of such healthcare system.
Hadi Haeri,Vahab Sarfaraz,Zheming Zhu,Mohammad Fatehi Marji 국제구조공학회 2019 Smart Structures and Systems, An International Jou Vol.23 No.5
In this paper, the interaction between notch and micro pore under uniaxial compression has been performed experimentally and numerically. Firstly calibration of PFC2D was performed using Brazilian tensile strength, uniaxial tensile strength and biaxial tensile strength. Secondly uniaxial compression test consisting internal notch and micro pore was performed experimentally and numerically. 9 models consisting notch and micro pore were built, experimentally and numerically. Dimension of these models are 10 cm *10 cm* 5 cm. the length of joint is 2 cm. the angularities of joint are 30°, 45° and 60°. For each joint angularity, micro pore was situated 2cm above the lower tip of the joint, 2 cm above the middle of the joint and 2 cm above the upper of the joint, separately. Dimension of numerical models are 5.4 cm*10.8 cm. The size of the cracks was 2 cm and its orientation was 30°, 45° and 60°. Diameter of pore was 1cm which situated at the upper of the notch i.e., 2 cm above the upper notch tip, 2 cm above the middle of the notch and 2 cm above the lower of the notch tip. The results show that failure pattern was affected by notch orientation and pore position while uniaxial compressive strength is affected by failure pattern.
Dar, A.H.,Sarfaraz, Mohd.,Ahmad, M.K. The Kangwon-Kyungki Mathematical Society 2018 한국수학논문집 Vol.26 No.1
In this slush pile, we introduce a new kind of variational inclusions problem stated as random extended generalized nonlinear variational inclusions for random fuzzy mappings. We construct an iterative scheme for the this variational inclusion problem and also discuss the existence of random solutions for the problem. Further, we show that the approximate solutions achieved by the generated scheme converge to the required solution of the problem.
Efficient GPU Isosurface Ray-casting of BCC Datasets
김민호,김현준,Kim, Minho,Kim, Hyunjun,Sarfaraz, Aaliya Korea Computer Graphics Society 2013 컴퓨터그래픽스학회논문지 Vol.23 No.2
본 연구에서는, 결과물의 우수함을 유지하면서도 기존 연구결과의 성능을 4-7배 향상시킨 실시간 GPU 등가면 볼륨 레이케스터를 제시한다. 이러한 성능 향상은 효율적인 빈공간 생략법과 분석적 그레디언트 계산법을 도입함으로써 가능하다. 빈공간 생략법은 스플라인 조각들의 BB-형식으로부터 만등어진 최소/최대값 옥트리에 기반하고 있고, 분석적 그레디언트 계산법은 보다 정확한 렌더링 결과를 제공할 뿐 아니라 더욱 빠른 계산이 가능하도록 한다. This paper presents a real-time GPU (Graphics Processing Unit) isosurface ray-caster that improves the performance by 4-7 folds from our previous method, while keeping the superior visual quality. Such an improvement is achieved by incorporating an efficient empty-space skipping scheme and an analytic normal computation. The empty-space skipping scheme is done by building an min/max octree computed from the BB(Bernslein-B$\acute{e}$zier)-form of spline pieces and the analytic normal Formula provides not only a nice visual quality but also an improved evaluation performance.