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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.
양훈철(HoonChul Yang),손순일(SoonIl Son),최아름(AhReum Choi),Ahmed Sarfaraz,정승(Seung Jeong),황현주(HyunJoo Hwang),이나라(NaLa Lee) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Fire resistant cables usually apply to emergency power and fire safety systems, such as fire alarm, sprinkler, smoke ventilation system and so on. And, high performance of fire resistant cables is important to provide the safety environmental sustainability needed to electrical circuits in oil and gas plants. Recently, various fire resistant cables of LS cable & System were developed. This paper presents experimental investigations and results for continuous operation for a certain time under fire explosion condition. To obtain fire and heat resistant material properties of the cable, a specific resistant layer between the metal conductor and the polymer insulation was introduced. The developed fire resistant cables meet the requirement of various safe circuit integrities with the mechanical impact and the water spray condition for application of onshore and offshore plants.