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Babs M.F. Hendriks,Roald S. Schnerr,Gianluca Milanese,Cécile R.L.P.N. Jeukens,Sandra Niesen,Nienke G. Eijsvoogel,Joachim E. Wildberger,Marco Das 대한영상의학회 2019 Korean Journal of Radiology Vol.20 No.2
Objective: To evaluate the radiation dose for pregnant women and fetuses undergoing commonly used computed tomography of the pulmonary arteries (CTPA) scan protocols and subsequently evaluate the simulated effect of an optimized scan length. Materials and Methods: A total of 120 CTPA datasets were acquired using four distinctive scan protocols, with 30 patients per protocol. These datasets were mapped to Cristy phantoms in order to simulate pregnancy and to assess the effect of an effective radiation dose (in mSv) in the first, second, or third trimester of pregnancy, including a simulation of fetal dose in second and third trimesters. The investigated scan protocols involved a 64-slice helical scan at 120 kVp, a high-pitch dual source acquisition at 100 kVp, a dual-energy acquisition at 80/140 kVp, and an automated-kV-selection, high pitch helical scan at a reference kV of 100 kVref. The effective dose for women and fetuses was simulated before and after scan length adaptation. The original images were interpreted before and after scan length adaptations to evaluate potentially missed diagnoses. Results: Large inter-scanner and inter-protocol variations were found; application of the latest technology decreased the dose for non-pregnant women by 69% (7.0–2.2 mSv). Individual scan length optimization proved safe and effective, decreasing the fetal dose by 76–83%. Nineteen (16%) cases of pulmonary embolism were diagnosed and, after scan length optimization, none were missed. Conclusion: Careful CTPA scan protocol selection and additional optimization of scan length may result in significant radiation dose reduction for a pregnant patient and her fetus, whilst maintaining diagnostic confidence.
Exponentially Convex Functions Depending on the Norm
A. S. Okb El-Bab ...et al KYUNGPOOK UNIVERSITY 2000 Kyungpook mathematical journal Vol.40 No.1
A number of results concerning exponentially convex functions defined on infinite dimensional spaces and depends on the norm are considered. First, we show that if F(x) = f(||x||²) is a continuous exponentially convex function on an in?nite dimensional space then f must be completely monotone and hence the integral representation of F can be obtained. The case of the Hilbert space is also considered. The necessary and sufficient condition for the function exp(-t^(α)) to be completely monotone is obtained and the integral representation of a f(·)-dependent exponentially convex function is also obtained. As a special case, the lpspaces, 0 < p ≤ 2, are considered.
BIM을 활용한 다중복합 프로젝트의 인트라넷 기반 통합사업관리체계 구축 방안
송일갑,허영란,서종원,Song, Il-Bab,Hur, Young-Ran,Seo, Jong-Won 한국BIM학회 2012 KIBIM Magazine Vol.2 No.1
공공사업의 경우 다중 프로젝트, 메가 프로젝트 등 다양한 발주형태로 건설사업이 추진됨에 따라 복합적이고 다원적인 관리가 필요하다. 건설사업관리를 효과적으로 하기 위하여 PMIS가 널리 사용되고 있으나 현재 대다수의 PMIS는 단일프로젝트 중심으로 개발되어있어 전체 사업관리를 위한 시스템 통합과정에서 시스템 간의 호환성 문제가 발생한다. 또한 공공사업 중심으로 사업과정에서 BIM을 적용하도록 한 발주가 증가하였으나, 아직까지 BIM을 활용한 사업관리를 위한 BIM 데이터 연계 PMIS의 개발 및 연구가 부족한 실정이다. 따라서 본 연구에서는 PMIS As-Is분석과 To-Be분석을 통해 다중복합 프로젝트 PMIS의 주요 목표기능을 도출하고 Internet-Intranet의 이원화 관리체계를 분석하여 통합사업관리체계를 적용한 PMIS 발전모델과, 상용 BIM Tool과 PMIS를 직접 결합하는 방식이 아닌 BIM 기술의 순차적인 적용방안을 통하여 통합사업관리시스템에 적합한 BIM 기반 PMIS 구축방안을 제시하여, 궁극적으로 BIM 기술의 활성화에 대비한 단계별 PMIS 발전 모델을 제안하는데 그 목적이 있다. Public construction projects need complex and multi-functional management skill, since the most of public construction projects are comprised of multi-project and mega-projects. In order to effectively manage construction projects, PMIS is widely used. However the majority of the current PMIS have been developed as a single project-oriented business management system. Thus compatibility problems are encountered during the process of integrating the entire systems to manage the multi-complex projects. In addition, the form of orders applying BIM are increased recently, but the research and development of BIM based PMIS are still lacking. In this study, therefore, the functions of PMIS main objectives based on the analysis of PMIS As-Is and To-Be of PMIS, the dual management system utilizing Internet and Intranet will be proposed to integrate the individual PMIS with Integrated Program Management System. Rather than combining commercial BIM tool and PMIS directly, which is the common method of failure, the sequential process model to adopt BIM based PMIS is also explained. Step-by-step development method of BIM based PMIS is suggested to prepare for the activation of BIM technology in the nearest future.
Gelayol Golkarnarenji,MINOO NAEBE,Jeffrey S. Church,Khashayar Badii,Alireza Bab-Hadiashar,Stephen Atkiss,Hamid Khayyam 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.49 No.-
Studying the presence and progress offiber defects, such as skin-core structure, is an important tool foranalysis of a chemical process. In this article, the skin core morphology has been analyzed by opticalmicroscopic (OM) images and Fourier transform infrared attenuated total reflectance mapping (FTIR-ATRmapping). The results of FTIR-ATR mapping showed that thefiber is almost uniform in the core area whileOM images are accurate enough to be used for skin-core analysis. Using OM images, the core ratio ofsamples were measured to quantify the skin-core structure. Non-parametric kernel density estimationmethods have then been compared with conventional parametric distribution models using these data. The results reveal that the parametric methods cannot adequately describe the skin-core phenomenonand that the non-parametric distributions are more appropriate for the quantification of skin-coremorphology. By applying the non-parametric distributions, a model has been developed, which describesthe relationship between the skin-core defect and the operation parameters of thefiber production. Thisapproach can be used to predict the probability of skin-core occurrence and can be used to decrease thepresence of this phenomenon in the carbonfibers production industry. Our results show thattemperature is one of the most significant operational parameter at a typical oxygen concentration (in airat atmospheric pressure) governing the skin-core formation.
Frank Efe Erukainure,Victor Parque,Mohsen A. Hassan,Ahmed M. R. Fath El-Bab 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.10
The measurement of viscoelastic properties of soft tissues has become a research interest with applications in the stiffness estimation of soft tissues, sorting and quality control of postharvest fruit, and fruit ripeness estimation. This paper presents a tactile sensor configuration to estimate the stiffness properties of soft tissues, using fruit as case study. Previous stiffness-measuring tactile sensor models suffer from unstable and infinite sensor outputs due to irregularities and inclination angles of soft tissue surfaces. The proposed configuration introduces two low stiffness springs at the extreme ends of the sensor with one high stiffness spring in-between. This study also presents a closed form mathematical model that considers the maximum inclination angle of the tissue’s (fruit) surface, and a finite element analysis to verify the mathematical model, which yielded stable sensor outputs. A prototype of the proposed configuration was fabricated and tested on kiwifruit samples. The experimental tests revealed that the sensor’s output remained stable, finite, and independent on both the inclination angle of the fruit surface and applied displacement of the sensor. The sensor distinguished between kiwifruit at various stiffness and ripeness levels with an output error ranging between 0.18 % and 3.50 %, and a maximum accuracy of 99.81 %, which is reasonable and competitive compared to previous design concepts.
Gamal A. Nasser,Ahmed L. Abdel-Mawgood,A. A. Abouelsoud,Hisham Mohamed,Shinjiro Umezu,Ahmed M. R. Fath El-Bab 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.7
Temperature control is a critical factor in PCR for efficient DNA amplification. The main aim is to achieve tight control and high rate of heating and cooling for a portable, cost-effective PCR device. This speed depends on reduction of the thermal mass of the PCR heating part. The common methods used to decrease the device's thermal mass or heating/ cooling time are to improve desirable device structural design and to choose a better heating and cooling mechanism with robust controller. Increasing the thermal mass provides a good temperature distribution on the heater surface, but it delays the heat transfer. Therefore, removing thermal mass makes the controller struggle to provide a high temperature uniformity distribution on Peltier surface. In this paper, we provide a cost-effective PCR heating/cooling system using Peltier element. This system is controlled using adaptive FLC with bang-bang as a hybrid controller to provide good accuracy with maximum available temperature changing rate. The results show that in cooling, the adaptive FLC with bang-bang controller is faster by 20 % than the normal PD-like FLC, however in heating it is faster by 5 to 10 %. The adaptive FLC provided steady state error 3 % and 1.5 % less than the normal FLC at denaturation and annealing steps, respectively. Temperature distribution is tested using thermal camera. The device is validated by performing conventional PCR. The amplification product was analyzed by electrophoresis on a 1.5 % agarose gel then stained with ethidium bromide and the products show successfully amplified.
Systematic study of charged-pion and kaon femtoscopy in Au + Au collisions at<sub>sNN</sub>=200GeV
Adare, A.,Afanasiev, S.,Aidala, C.,Ajitanand, N. N.,Akiba, Y.,Al-Bataineh, H.,Alexander, J.,Alfred, M.,Aoki, K.,Apadula, N.,Aramaki, Y.,Asano, H.,Atomssa, E. T.,Averbeck, R.,Awes, T. C.,Azmoun, B.,Bab American Physical Society 2015 PHYSICAL REVIEW C - Vol.92 No.3