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IASTED International Conference on Networks and Communication systems 2006

作者： Phaiboon, Supachai Pitithammawong, Kitti Chulajata, Tatcha Somkuarnpanit, Suripon Electrical Engineering Department Faculty of Engineering Mahidol University Phutthamonthon Nakornprathom 73170 Thailand Technology of Information System Management Program Faculty of Engineering Mahidol University Phutthamonthon Nakornprathom 73170 Thailand Electronic Department Faculty of Engineering KingMonkul's Institute of Technology Ladkrabang Chalongkrung Rd. Ladkrabang Bangkok Thailand

ISBN: (纸本)0889865906

This paper presents studies of propagation characteristics in a suburban forest based on a measurement campaign at a frequency of 1.8 GHz. We investigated how tree density affected the fast fading characteristic depending on tree density and base station antenna height in a range of 3, 4, and 5 m above ground while the receiving antenna height was fixed at 1.8 m above ground. Three categories were studied: high density area, low density areas and grass area. Measurement of the receiver signal over 120 s intervals for a stationary mobile were used to obtain the distribution functions for the fading. We found that the distributions followed a Rician distribution, whose K-factor depended on tree density and transmitter height.

关键词： Vegetation

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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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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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Numerical Simulation of Spear Motion as Game Items

Numerical Simulation of Spear Motion as Game Items

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International Symposium on Nanoscience and Nanotechnology in Life Sciences 2017, ISNNLS 2017

作者： Muhima, R.R. Mardi, S. Hariadi, M. Puspitasari, I. Informatics Engineering Department ITATS Arief Rachman Hakim 100 Surabaya Indonesia Electrical Engineering Department Sepuluh Nopember Institute of Technology Indonesia Information System Study Program Faculty of Science and Technology Universitas Airlangga Jl. Mulyorejo Surabaya60115 Indonesia

Game development in 3D is mostly done by characters, items and the environment. Game items such as character weapons modeled in 3D will be the attraction of a game. In this paper, spear motion as a game items is modeled in 3D. Nonlinear Equations Six Degrees of Freedom (6 DOF) are used for mathematical models of spear motion. The parameters studied in the motion model are: geometry, mass and aerodynamics. Spear aerodynamic parameters were analyzed using the Datcom method. Numerical simulation of mathematical models of spear motion with variations in the initial velocity of the throw and the direction of the throw. From the results of numerical simulation, the maximum range R = 131.7 m at the initial velocity V0 = 40 m/s, the direction of throw (angle θ0 = 35 deg, angle φ0 = 10 deg, ψ0 = 0 deg). And the maximum height Hmax = 12.18 m is achieved at the initial velocity V0 = 20 m/s, direction of throw (angle θ0 = 35 deg, angle φ0 = 40 deg, angle ψ0 = 0 deg). © 2020 Published under licence by IOP Publishing Ltd.

关键词： Aerodynamics

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Bioprinting Methods for Fabricating In Vitro Tubular Blood Vessel Models

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Cyborg and Bionic systems 2023年第1期4卷 178-195页

作者： Seon-Jin Kim Min-Gyun Kim Jangho Kim Jessie SJeon Jinsoo Park Hee-Gyeong Yi Department of Rural and Biosystems Engineering College of Agriculture and Life SciencesChonnam National UniversityGwangjuRepublic of Korea Department of Convergence Biosystems Engineering College of Agriculture and Life SciencesChonnam National UniversityGwangjuRepublic of Korea Interdisciplinary Program in IT-Bio Convergence System Chonnam National UniversityGwangju 61186Republic of Korea Department of Mechanical Engineering Korea Advanced Institute of Science and TechnologyDaejeonRepublic of Korea Department of Mechanical Engineering Chonnam National UniversityRepublic of Korea

Dysfunctional blood vessels are implicated in various diseases,including cardiovascular diseases,neurodegenerative diseases,and *** studies have attempted to prevent and treat vascular diseases and understand interactions between these diseases and blood vessels across different organs and *** studies were conducted using 2-dimensional(2D)in vitro and animal ***,these models have difficulties in mimicking the 3D microenvironment in human,simulating kinetics related to cell activities,and replicating human pathophysiology;in addition,3D models involve remarkably high ***,in vitro bioengineered models(BMs)have recently gained *** created through biofabrication based on tissue engineering and regenerative medicine are breakthrough models that can overcome limitations of 2D and animal *** can also simulate the natural microenvironment in a patient-and target-specific *** this review,we will introduce 3D bioprinting methods for fabricating bioengineered blood vessel models,which can serve as the basis for treating and preventing various vascular ***,we will describe possible advancements from tubular to vascular ***,we will discuss specific applications,limitations,and future perspectives of fabricated BMs.

关键词： Blood organs printing

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Dual-color nonlinear optical microscope imaging and its applications

Dual-color nonlinear optical microscope imaging and its appl...

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2011 International Quantum Electronics Conference, IQEC 2011 and Conference on Lasers and Electro-Optics, CLEO Pacific Rim 2011

作者： Lee, Jang Hyuk Choi, Dae Sik Song, Dong Hoon Cho, Eun Hee Shin, Sang-Mo Oh, Myoung-Kyu Ko, Do-Kyeong Graduate Program of Photonics and Applied Physics Gwangju Institute of Science and Technology Gwangju 500-712 Korea Republic of Graduate Program of Medical System Engineering Gwangju Institute of Science and Technology Gwangju 500-712 Korea Republic of Advanced Photonics Research Institute Gwangju Institute of Science and Technology Gwangju 500-712 Korea Republic of

ISBN: (纸本)9780977565771

A photonic crystal fiber (PCF) based dual-color nonlinear microscope that combines coherent anti-Stokes Raman scattering (CARS) microscopy and two-photon excitation fluorescence (TPEF) microscopy was developed and applied to imaging of polystyrene beads, lily pollens, and live breast cancer cells using a femtosecond laser. © 2011 IEEE.

关键词： Photonic crystal fibers

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Quality index design for online monitoring injection molding process 77

Quality index design for online monitoring injection molding...

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77th Annual Technical Conference of the Society of Plastics Engineers, ANTEC 2019

作者： Chen, Jian-Yu Huang, Ming-Shyan Nian, Shih-Chih Tseng, Chien-Chou Bachelor Program of Precision System Design Feng Chia University Taiwan Dept. of Mechanical and Automation Engineering National Kaohsiung University of Science and Technology Taiwan Dept. of Power Mechanical Engineering National Taitung College Taiwan

Quality control is a crucial issue in the injection molding process with target of obtaining a high yield rate and reducing production cost. However, conventional injection molding acts like a black-box in which the flowing behavior of polymer melt within cavities is unseen, and the tuning of process parameters is heavily relied on operators' experience, design of experimental methods, or even trial- and-error. Such approaches are not only time-consuming but also lack of assuring consistent injection molding qualities and quality control is then required. Nowadays with the advance of sensing technology, many sensors are available to detect the flowing behavior of polymer melt within mold cavities. Particularly the pressure, velocity, and temperature that affect the flowing ability of polymer melt can be detected in time. In other words, injection molding now has been transformed into a grey-box and a scientific viewpoint to tune process parameters can be realized. In this research, a quality index extracted from pressure profile is aimed for online quality monitoring. In addition, the clamping force increment quality index extracted from the tie-bar elongation which is detected by strain gauges attached on tie bars, free of invading injection mold structure, is paid much attention. To verify the feasibility of the designed quality index using to prediction the injection molded quality, varying barrel temperature, back pressure and rotational speed of plasticizing screw those can affect the plasticizing quality of raw materials are conducted in this investigation. Experimental results reveals that the clamping force increment as well as pressure peak index extracted from injection system pressure, nozzle pressure, end-of-filling cavity pressure profiles during injection molding are highly correlated with injection-molded qualities and thereby are feasible to be a good quality indicator. © 2019 Society of Plastics Engineers. All rights reserved.

关键词： Polymer melts

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Collaboration maturity and the offshoring cost barrier: The trade-off between flexibility in team composition and cross-site communication effort in geographically distributed development projects

Collaboration maturity and the offshoring cost barrier: The ...

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IEEE International Professional Communication Conference (IPCC)

作者： Lasser, S Heiss, M Siemens AG Austria PSE Austria Vienna University of Technology Austria Program and System Engineering (PSE) Division Siemens AG Austria Austria Fachhochschule des bfi Wien (University of Applied Sciences of the bfi Vienna) Austria

ISBN: (纸本)078039027X

This paper analyzes how total project costs are split into operative costs and distribution costs. This split depends on the collaboration model being applied and the level of maturity of the collaboration. The lower the collaboration maturity, the more significant the so-called offshoring cost barrier, i.e. the resources and time needed to progress toward more cost-effective forms of collaboration. The low-cost offshoring problem is stated as a cost optimization problem, with customer requirements and internal requirements as boundary conditions. The more degree of freedom is available for project team composition, the better the result will be. The project team composition is always a trade-off between including the best available experts from different sites and the corresponding communication and coordination problems. Finally we will show how Siemens PSE (a Siemens-in-house R&D division with 5500 engineers distributed over 20 sites) is organized in terms of optimizing the low-cost offshoring problem.

关键词： collaboration model distribution costs global software development low-cost offshoring problem offshoring cost barrier team composition

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Proof-of-concept for a novel management mobility framework for point to point radio communication in wireless networks

Proof-of-concept for a novel management mobility framework f...

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作者： Pitu, Ciprian-Leonard Blendea, Carmen-Melinda Campeanu, Radu Siemens Program and System Engineering Braşov Corporate Technology Central Eastern Europe Department Romania Universitatea Transilvania Braşov Catedra de AutomaticǍ Romania

ISBN: (纸本)9789537044114

In this paper the authors present the results of an implementation prototype based on previous concepts studies: a novel management mobility framework with functions for builtin verification of configuration changes and for fault tolerant algorithm. Such a mechanism is required to obtain network stability, to prevent the data loss, inadequate changes and to ensure that the moving entity stays connected in case of the mobility of a dynamic and busy wireless network environment. The scope of this paper is to propose a proof of concept study in order to demonstrate the reliability and the superiority of the new architecture when compared to the traditional peer-to-peer (P2P) model, to evaluate the effects of the novel framework. The paper deal with the implementation of the algorithms for fault tolerant and functions for update the network configuration against all unexpected changes. The advantage of this approach is that the faults rate are extremely decreased, the flow of data is constant, time is saved, the client performance is increased and the server load is reduced. The mobility framework is implemented in Java using OMNET++ as a simulation environment.

关键词： Radio communication

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Integrated model of two-echelon inventory system considering lead time acceleration and component commonality

Integrated model of two-echelon inventory system considering...

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World Congress on engineering, WCE 2014

作者： Hidayat, Y.A. Sebrina Ardiansyah, M.N. Sembada, W.J. Research Group on Industrial System and Techno-Economics Faculty of Industrial Technology Institut Teknologi Bandung Ganesa 10 Bandung 40132 Indonesia Industrial Engineering and Engineering Study Program Faculty of Industrial Technology Institut Teknologi Bandung Indonesia Ganesa 10 Bandung 40132 Indonesia

ISBN: (纸本)9789881925350

In the case of multi-echelon and multi-item inventory systems, the option of accelerated lead time can reduce the inventory cost of the system but on the other hand increase the crashing cost. We utilize an optimization model to show the impact of lead time acceleration by considering component commonality. These imply that lead time is controllable and products taken into example consist of unique and common components. We use some hypothetical data to test the model. We extend the model for two-echelon inventory system by considering controllable lead time and service level constraint and adding the concept of component commonality in a multi-product's items case. The results show that most of demand is fulfilled by unique components for both products. Subsequently, the lead time of common component becomes not significant (=0).

关键词： Inventory control

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