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AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2021

作者： Choi, Jaewon Gong, Duhyun Yoon, Namkyung Shin, Sangjoon Interdisciplinary Program in Space System Seoul National University Seoul08826 Korea Republic of School of Mechanical and Aerospace Engineering Seoul National University Seoul08826 Korea Republic of

ISBN: (纸本)9781624106095

Unlike birds, insect type flapping wing mechanism does not have tail wings. Therefore, its fuselage attitude is adjusted by either varying direction of the stroke plane or twisting the trailing edge. In this paper, design and simulation of a control mechanism are to be presented. The control mechanism produces 3-axis moments by trailing edge control (TEC). TEC generates control moments by twisting a rod connected to the root of the main wings. For proper operation of TEC, kinematic analysis is conducted to determine its appropriate linkage length and the location of the mounted components. In addition, free play phenomenon caused by the backlash, which causes degradation in control ability, is also considered. Also, the wing shaft displacement caused by the free play is considerably decreased. To observe the control moments caused by the TEC, simulation is conducted by DYMORE software. The physical and aerodynamic phenomena caused by TEC are observed. Therefore, the prototype of the current mechanism is fabricated based on the analysis results. In the future, experiments for the proposed control mechanism will be conducted. Then, the control moment generated by the prototype will be evaluated and physical phenomena caused by the control moment will be observed. Also, a PID controller will be designed for stable flight based on numerical simulation results. © 2021, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Wings

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Simultaneous planar measurement of size and three-component velocity of droplets in an aero-engine airblast fuel spray by stereoscopic interferometric laser imaging technique

Simultaneous planar measurement of size and three-component ...

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10th International Conference on Liquid Atomization and Spray systems, ICLASS 2006

作者： Matsuura, Kazuaki Zarogoulidis, Konstantinos Hardalupas, Yannis Taylor, Alexander M.K.P. Kawaguchi, Tatsuya Sugimoto, Daisuke Hishida, Koichi Aviation Program Group Japan Aerospace Exploration Agency Japan Department of Mechanical Engineering Imperial College London United Kingdom Department of Mechanical and Control Engineering Tokyo Institute of Technology Japan Department of System Design Engineering Keio University Japan

A new technique is proposed to simultaneously measure the size and three-component velocity of droplets, which is the extension of the interferometric laser imaging technique to the stereoscopic configuration. The optical compression concept is also utilized to avoid droplet image overlap for the application to the relatively dense region of sprays. The applicability of the technique is successfully demonstrated by using a practical aero-engine airblast fuel spray field. The results are compared with those by the phase Doppler anemometry to evaluate the performance. The results by the two techniques show good agreement. The influence of the air pressure drop through the nozzle is also studied by the present technique and the results are reasonable and consistent with those from literatures. Some important characteristics of the complicated counter-swirling airblast spray field is clearly revealed, taking advantage of the present technique, such as the droplet motions influenced by the air flow in the recirculation zone and in the attenuated circumferential counter-swirl shear-layer structure, not only by the mean velocity values, but also by the various correlations among droplet properties.

关键词： Drops

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Flight test verification of the radio communication systems design for an unmanned scaled supersonic experimental airplane

Flight test verification of the radio communication systems ...

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2007 AIAA InfoTech at Aerospace Conference

作者： Murakami, Yoshitaka Tada, Akira Takizawa, Minoru Nakano, Eiichiro Japan Aerospace Exploration Agency Mitaka Tokyo 181-0015 Japan Japan Aerospace Exploration Agency Tukuba Ibaraki 305-8505 Japan Supersonic Transport Team Aviation Program Group Space Transportation Program System Engineering Office

ISBN: (纸本)1563478935

The radio communication systems for an unmanned scaled supersonic experimental airplane NEXST-1 consist of three kinds of system of telemetry, command and radar-transponder including ground and onboard equipments. This paper discusses the results of the system design and antenna pattern test during the design and development phase. And then the paper verifies the results of RF link design by comparing with the analyzed flight test data of RSSI and SS obtained for the 15 minuets and 22 seconds, as well as the positioning comparison between IMU and Radars. The analysis results of the RF link include the exhaust plumes effect for the verification in the flight.

关键词： Aircraft

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Ultra-tiny-scale technology for engineering human ear therapeutics

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Biofabrication 2025年第3期17卷 2025 Apr 29页

作者： Sharma, Harshita Kim, Woochan Oh, Sejong Kim, Dream Lee, Shinyull Park, Sangbae Oh, Jooseon Park, Sunho Kim, Jangho Department of Convergence Biosystems Engineering Chonnam National University Gwangju 61186 South Korea Department of Rural and Biosystems Engineering Chonnam National University Gwangju 61186 South Korea Interdisciplinary Program in IT-Bio Convergence System Chonnam National University Gwangju 61186 South Korea Department of Bio-Industrial Machinery Engineering Pusan National University Miryang-si 50463 South Korea Department of Biosystems Engineering Seoul National University Seoul 08826 South Korea Institute of Nano-Stem Cells Therapeutics NANOBIOSYSTEM Co. Ltd Gwangju 61008 South Korea

Ultra-tiny-scale technology representing engineered micro- and nano-scale materials has gained considerable attention for a wide range of applications, including hearing restoration. The advent of hearing loss and its recovery has been the topic of intense discussion since many decades. Although conventional treatments partially support hearing recovery, they present certain limitations such as subsequent immune response and donor site morbidity leading to even worsened sensory disturbances. Microscale- and nanoscale-based approaches such as tissue engineering, nanoparticle-assisted drug delivery systems, and micro/nanofabrication-aided auditory stimulations have been shown to play an efficient role in recovery from hearing disorders. In particular, the introduction of different biomaterials and biopolymers (natural and synthetic) with influential topographical cues and excellent biocompatibility has been found to conveniently bypass previous challenges posed by rigid human ear structures and provided a new path for improved and advanced hearing-recovery approaches. This review is focused on the development of micro/nanoengineering-based hearing recovery therapeutics and their significant impact on the future of hearing research. It discusses the physiological functions associated with the human ear and the mechanism underlying distinct hearing loss disorders as well as highlights various engineered ultra-tiny-scale-assisted strategies for developing advanced hearing therapeutics. Finally, we deliberate on commercialization aspect and future perspectives of implementing micro/nanotechnologies for hearing restoration platforms. © 2025 IOP Publishing Ltd. All rights, including for text and data mining, AI training, and similar technologies, are reserved.

关键词： auditory stimulation hearing loss hearing therapeutics micro and nanoengineering nanomedicine

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Review, analysis, and hazard mitigation of the life-support oxygen system on royal Australian air force P-3 orion aircraft

Review, analysis, and hazard mitigation of the life-support ...

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Flammability and Sensitivity of Materials in Oxygen-Enriched Atmospheres: 11th Edition

作者： Hay, Peter J. Burns, David M. C. Steinberg, Theodore A. Maritime Patrol System Program Office Defence Materiel Organisation RAAF Base Edinburgh SA 5111 Australia School of Engineering Systems Faculty of Built Environment and Engineering Queensland University of Technology Brisbane QLD 4001 Australia

ISBN: (纸本)0803134053

To ensure the ongoing safe operation of the Royal Australian Air Force (RAAF) P-3 Orion life-support oxygen system, a system review was completed that Included a failure modes and effects analysis combined with an oxygen hazards and fire risk analysis. Though the RAAF P-3 Orion oxygen system has been operational for many years, the results of these analyses clearly identified many deficiencies in the current system configuration, thus demonstrating the value of the formal analysis approach. Design, procedural, maintenance, and material Issues were all identified and addressed In the course of this process. This paper provides a brief summary of the analyses performed, the results obtained, risk tables generated, and their use leading to the recommendations for changes incorporated onto RAAF P-3 Orion aircraft that resulted from this work. Copyright © 2006 by ASTM International.

关键词： Oxygen

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The smoking acute effect on the cyclic variation in blood echogenicity fromthe common carotid artery

The smoking acute effect on the cyclic variation in blood ec...

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IEEE International Ultrasonics Symposium

作者： Li, Ying Bok, Tae-Hoon Yang, Jeong-Hwa Choi, Min-Joo Paeng, Dong-Guk Department of Oceanic Information and System Engineering Korea Republic of Interdisciplinary Postgraduate Program in Biomedical Engineering Korea Republic of Department of Medicine Jeju National University Korea Republic of Department of Radiotechnology Cheju Halla College Korea Republic of

ISBN: (纸本)9781457703829

The cyclic variation in echogenicity (CVE) was observed from thecross-sectional images of the common carotid artery using coded harmonic imagingof a GE ultrasound system. The objective of this research is to study thesmoking acute effects on the amplitude of the CVE (Acve). A cve was analyzed among the 28 smokers before and after 1-2 cigaretteswere smoked. The smokers were optimally divided into two clusters with respectto the change in Acve and the intrinsic characteristics of smokers(i.e., daily consumed cigarettes and smoking years) through a two-step clusteranalysis (TSCA). The relative change of Acve after smoking wassignificantly higher in the heavy smoker cluster compared with the light smokercluster. However, there is no significant difference in the absolute value ofAcve between before and after smoking for both two clusters. Theeffect of tissue attenuation on Acve was compensated with body massindex (BMI). The compensated parameter, A'cve, is significantlyincreased in heavy smoker group after smoking (BS: 0.477.4;AS: 5.48.0;p0.05).It is in agreement with the analytical result of AA cve. Furthermore,after smoking, A'cve is significant higher in heavy smoker group(5.48.0), compared with light smoker group (1.36.7;p0.05). It suggests that thecompensation of Acve is help to reduce the interference from tissueattenuation and is good for the comparison among individuals. © 2010 IEEE.

关键词： Health

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Reinforcement Learning-Based Approach for Microservices-Based Application Placement in Edge Environment 28

Reinforcement Learning-Based Approach for Microservices-Base...

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28th IEEE Symposium on Computers and Communications, ISCC 2023

作者： Gasmi, Kaouther Abassi, Kamel Romdhani, Lamia Debauche, Olivier National Engineering School of Tunis University of Tunis El Manar Communication System Laboratory Tunis Tunisia Qatar University Core Curriculum Program Doha Qatar University of Mons Faculty of Engineering-ILIA / Infortech Mons Belgium

ISBN: (纸本)9798350300482

Edge computing allows for the deployment of applications near end-users, resulting in low-latency real-Time applications. The adoption of the microservices architecture in modern applications has made this possible. Microservices architecture describes an application as a collection of separate but interconnected entities that can be built, tested, and deployed individually. Each microservice runs in its own process and exchanges data with others. Instead, edge nodes can independently deploy microservices-based IoT applications. Consistently meeting application service level objectives while also optimizing service placement delay and resource utilization in an edge environment is non-Trivial. The present paper introduces a dynamic placement strategy that aims to fulfill application constraints and minimize infrastructure resource usage while ensuring service availability to all end-users of the UE in the edge network. © 2023 IEEE.

关键词： Reinforcement learning

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Enhancing the interlaminar shear strength of unidirectional carbon fiber reinforced plastic (CFRP) laminate using a nanofiber Z-threading strategy 5

Enhancing the interlaminar shear strength of unidirectional ...

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5th Annual Composites and Advanced Materials Expo, CAMX 2018

作者： Kirmse, Sebastian Hsiao, Kuang-Ting University of South Alabama Department of Mechanical Engineering 150 Jaguar Drive Shelby Hall MobileAL36608 United States System Engineering Program Department of Mechanical Engineering 150 Jaguar Drive Shelby Hall MobileAL36608 United States

Traditional carbon fiber reinforced plastic (CFRP) laminates without z-directional fiber-reinforcement are vulnerable to matrix-sensitive damages including the interlaminar shear failure. It was hypothesized that long carbon nanofibers (CNFs) zig-zag thread through multiple layers of carbon fibers along the z-direction could form an interlocked multiscale fiber-reinforcement network, therefore, enhance the interlaminar shear strength (ILSS) of the CNF z-threaded CFRP laminate. To find the answer, the "Double-Notch Shear Test" (ASTM D3846) was performed on the CNFs z-threaded unidirectional CFRP laminates. The CNFs z-threaded CFRP prepreg was manufactured by flow-transferring a resin film, containing 1 wt% electrical-field-aligned CNFs, into a dry unidirectional carbon fabric. The prepregs were stacked and cured into a laminate using an Out Of Autoclave-Vacuum Bag Only (OOA-VBO) process. Benchmarked with the ILSS of the control CFRP laminates, the CNF z-threads added a statistically substantial improvement to the CFRPs with an increased mean by +35.15 % and a reduced uncertainty (i.e., coefficient of variation) by -47.56 %. Oppositely, unaligned CNFs added to CFRPs yielded a negligible change in the mean and a substantially worse uncertainty. A microscopic morphology study was performed on the CNFs z-threaded CFRPs to understand the roles of the CNF z-threads in the interlaminar shear fracture mechanism. © 2018. Used by CAMX - The Composites and Advanced Materials Expo. CAMX Conference Proceedings. Dallas, TX.

关键词： Carbon nanofibers

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Toward patient safety in closed-loop medical device systems 10

Toward patient safety in closed-loop medical device systems

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1st ACM/IEEE International Conference on Cyber-Physical systems, ICCPS 2010

作者： Arney, David M., Pajic J.M., Goldman I., Lee R., Mangharam O., Sokolsky Computer and Information Science University of Pennsylvania United States Electrical and System Engineering University of Pennsylvania United States MD PnP Program Massachusetts General Hospital CIMIT United States

ISBN: (纸本)9781450300667

A model-driven design and validation of closed-loop medical device systems is presented. Currently, few if any medical systems on the market support closed-loop control of interconnected medical devices, and mechanisms for regulatory approval of such systems are lacking. We present a system implementing a clinical scenario where closed-loop control may reduce the possibility of human error and improve safety of the patient. The safety of the system is studied with a simple controller proposed in the literature. We demonstrate that, under certain failure conditions, safety of the patient is not guaranteed. Finally, a more complex controller is described and ensures safety even when failures are possible. This investigation is an early attempt to introduce automatic control in clinical scenarios and to delineate a methodology to validate such patient-in-the-loop systems for safe and correct operation. © 2010 ACM.

关键词： Closed loop control systems

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Mixed-Reality Simulator for Analysis of Interactions between Humans and Crawler Cranes 13

Mixed-Reality Simulator for Analysis of Interactions between...

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Joint 13th International Conference on Soft Computing and Intelligent systems and 25th International Symposium on Advanced Intelligent systems, SCIS and ISIS 2024

作者： Yamanobe, Kenta Yokota, Kazuya Uenoyama, Daigo Fujiura, Daisuke Ogura, Masataka Takahashi, Kengo Abe, Masajiro Nagaoka University of Technology Master's Program in Mechanical Engineering Nagaoka Japan Nagaoka University of Technology Department of Mechanical Engineering Nagaoka Japan Nagaoka University of Technology Bachelor's Program in Mechanical Engineering Nagaoka Japan Nagaoka University of Technology Center for Integrated Technology Support Nagaoka Japan Nagaoka University of Technology Department of System Safety Engineering Nagaoka Japan

ISBN: (纸本)9798350373332

Crawler cranes are used in various applications, including plant construction and civil engineering. However, accidents caused by hazardous events, such as overturning the entire body or overshadowing of a suspended load, can be problematic. Because crawler cranes are large and powerful machines, simulators are required to analyze the relationship between such hazardous events and human operations. This study proposed a framework for a mixed-reality simulator to analyze the interactions between humans and crawler cranes. This framework combined the high-performance graphics capabilities of Unreal Engine 5 with the high-precision multibody dynamics analysis of MATLAB Simscape to create a visually and physically realistic simulation. Moreover, the quantification of the decision-making process was possible based on the eye-tracking information of the operator. This study described the implementation of these features and discussed the prospects for human-crawler crane interaction analysis using this simulator. © 2024 IEEE.

关键词： MATLAB

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