2017 8th International Conference on Recent Advances in Space Technologies (RAST)最新文献

How does inventory performance affect operational performance? An example from U.S. space vehicles and aircraft parts industries 库存绩效如何影响经营绩效?以美国航天飞行器和飞机零部件工业为例

2017 8th International Conference on Recent Advances in Space Technologies (RAST) Pub Date : 2017-06-19 DOI: 10.1109/RAST.2017.8002941

Gülşah Hançerlioğullan, Emrah Köksalmiş, F. Calisir

{"title":"How does inventory performance affect operational performance? An example from U.S. space vehicles and aircraft parts industries","authors":"Gülşah Hançerlioğullan, Emrah Köksalmiş, F. Calisir","doi":"10.1109/RAST.2017.8002941","DOIUrl":"https://doi.org/10.1109/RAST.2017.8002941","url":null,"abstract":"Inventory management is in the heart of operational performance in aircraft parts and space vehicles industries. As a result of its importance in practice, this subject has been extensively studied in recent years in operations management. The main focus of this study is to look at the relationship between inventory management performance such as inventory effectiveness, efficiency and responsiveness and company operational performance. A performance model, which includes the different dimensions of aircraft parts and space vehicle industries' inventory management system, has been applied and empirically tested. In order to examine the effect of various measures on inventory performance, the regression analysis has been employed. We use financial data of 39 publicly listed U.S. aircraft parts and space vehicle industries for the 11-year period, 2005 to 2015. The data (Compustat North America Annually Updated) is taken from Standard &Poor's Compustat database via Wharton Research Data Services (WRDS). We discuss the implementation of these experimental results on the study of inventory management policy execution, and give researchers some guidance for further research areas.","PeriodicalId":434418,"journal":{"name":"2017 8th International Conference on Recent Advances in Space Technologies (RAST)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127507762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Hybrid rocket engine design with multi-objective vibrational genetic algorithm 基于多目标振动遗传算法的混合火箭发动机设计

2017 8th International Conference on Recent Advances in Space Technologies (RAST) Pub Date : 2017-06-19 DOI: 10.1109/RAST.2017.8002937

Mehmet Burak Ozbilgin, H. Telli, O. Ozkan

{"title":"Hybrid rocket engine design with multi-objective vibrational genetic algorithm","authors":"Mehmet Burak Ozbilgin, H. Telli, O. Ozkan","doi":"10.1109/RAST.2017.8002937","DOIUrl":"https://doi.org/10.1109/RAST.2017.8002937","url":null,"abstract":"In this study, the conceptual design of a single-stage hybrid rocket engine of a low-altitude sounding rocket is developed using the Multi-Objective Vibrational Genetic Algorithm (MOVGA). A hybrid rocket engine design having single circular port fuel grain with constant cross-section doped with oxidizer is done. Hybrid rocket engine is fueled by Hydroxyl-Terminated Polybutadiene (HTPB) with oxygen as the oxidizer. This is probably the first study in which the MOVGA is used for a hybrid rocket engine design problem. Vibrational genetic algorithm used in the hybrid rocket engine design problem as a comprehensive mutation technique provides diversity in the population in order to explore and find the global optimum quickly. For a high efficient hybrid rocket, the design problem is formulated as maximization of the flight altitude with minimum total mass with engine size (length to diameter ratio) constraint. The algorithm estimates the optimum hybrid rocket engine design including thrust, sizing and flight altitude calculations. Consequently, a mechanical design of a manufacturable and testable hybrid rocket engine is accomplished by means of the MOVGA in reasonable CPU times.","PeriodicalId":434418,"journal":{"name":"2017 8th International Conference on Recent Advances in Space Technologies (RAST)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121936069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Integrated SVD/EKF attitude estimation with UD factorization of the measurement noise covariance 结合测量噪声协方差UD分解的SVD/EKF姿态估计

2017 8th International Conference on Recent Advances in Space Technologies (RAST) Pub Date : 2017-06-19 DOI: 10.1109/RAST.2017.8002963

Demet Cilden Guler, C. Hajiyev

引用次数: 1

Experimental investigation of auxetic structures subjected to quasi static axial load 拟静力轴向载荷作用下塑性结构的试验研究

2017 8th International Conference on Recent Advances in Space Technologies (RAST) Pub Date : 2017-06-19 DOI: 10.1109/RAST.2017.8002986

K. Günaydın, Zana Eren, F. Scarpa

引用次数: 9

PRN code correlation in GPS receiver GPS接收机中PRN码的相关

2017 8th International Conference on Recent Advances in Space Technologies (RAST) Pub Date : 2017-06-19 DOI: 10.1109/RAST.2017.8002960

Ahmet Esat Süzer, H. Oktal

{"title":"PRN code correlation in GPS receiver","authors":"Ahmet Esat Süzer, H. Oktal","doi":"10.1109/RAST.2017.8002960","DOIUrl":"https://doi.org/10.1109/RAST.2017.8002960","url":null,"abstract":"Satellite based positioning systems like GPS (Global Positioning System) exist in every moment of our lives. GPS signal is broadcasted by Link1 (L1) and Link2 (L2) frequencies, separately. L1 is assigned to civil users, while L2 is especially for military users. GPS signal consists of navigation message and PRN codes (C/A for civil and P-code for military) which is an identity for satellite. PRN codes are also used to determine the range between the satellite and the receiver. The navigation message added on PRN code, must be known to find the position of GPS receiver on Earth. Identification of PRN code is the most important process to calculate the receiver's position. A correlation process in receiver is implemented to find PRN code changing for each satellite. Three common methods are available for the correlation process. These methods are Serial Search, Parallel Frequency Space Search and Parallel Code Phase Search Acquisition. Parallel Code Phase Search is faster and ended in less steps compared to other two methods. The aim of this study is to present the correlation technics used for the acquisition of satellite signal in GPS receivers. For this purpose, a correlation example is simulated in MATLAB environment to demonstrate how the correlation process in GPS receiver is performed.","PeriodicalId":434418,"journal":{"name":"2017 8th International Conference on Recent Advances in Space Technologies (RAST)","volume":"229 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117107240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Commercial space travel understanding the legal, ethical and medical implications for commercial spaceflight participants and crew 商业太空旅行了解对商业太空飞行参与者和机组人员的法律、伦理和医学影响

2017 8th International Conference on Recent Advances in Space Technologies (RAST) Pub Date : 2017-06-19 DOI: 10.1109/RAST.2017.8002956

Sara M. Langston

{"title":"Commercial space travel understanding the legal, ethical and medical implications for commercial spaceflight participants and crew","authors":"Sara M. Langston","doi":"10.1109/RAST.2017.8002956","DOIUrl":"https://doi.org/10.1109/RAST.2017.8002956","url":null,"abstract":"Commercial human spaceflight raises numerous medical, legal and ethical considerations with regard to the health and safety of civilian spaceflight participants (SFPs) and commercial crew. New and emerging space transportation companies are proposing a range of commercial suborbital, orbital, interplanetary and point-to-point space transportation. However, the diversity in mission architecture, operation, flight purpose and duration make it difficult to establish a solitary risk assessment or approach towards spaceflight as a homogeneous activity. Even after 50 years in space, there is no denying that a great deal of scientific, technological and medical uncertainty exists with spaceflight. While some hazards have been identified (e.g. acceleration, microgravity, radiation and meteorites), physiological risks and uncertainties for spacefarers remain and are accentuated in opening space access to a wide demographic of individuals with varying levels of fitness and no standardized medical criteria for selection. In addition, the scope of physiological risks spans pre-flight, in-flight and post-flight operations and activities this in turn triggers practical mitigation measures and bioethical-legal duties, such as full disclosure and informed consent. This paper will provide an overview of the applicable laws, underlying values and duties of care intertwined with spaceflight and addresses prominent concerns of medical uncertainty and human risk factors. The aim of which is to assist in establishing a practical, prudent and sustainable framework for human expansion into space.","PeriodicalId":434418,"journal":{"name":"2017 8th International Conference on Recent Advances in Space Technologies (RAST)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124939620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

The role of Venezuelan space technology in promoting development in Latin America 委内瑞拉空间技术在促进拉丁美洲发展方面的作用

2017 8th International Conference on Recent Advances in Space Technologies (RAST) Pub Date : 2017-06-19 DOI: 10.1109/RAST.2017.8002940

J. Peña, T. Yumin

{"title":"The role of Venezuelan space technology in promoting development in Latin America","authors":"J. Peña, T. Yumin","doi":"10.1109/RAST.2017.8002940","DOIUrl":"https://doi.org/10.1109/RAST.2017.8002940","url":null,"abstract":"Space technology and resources are used around the world to address societal challenges. Space provides valuable satellite services, unique scientific discoveries, surprising technology applications and new economic opportunities. Venezuela formally recognizes the advantages of space resources and pursues national level activity to harness them. Venezuela space cooperation has grown in the past several years, contributing to debates over Venezuela's rising influence in the Latin America. This paper summarizes the establishment and current development of space activities in the Bolivarian Republic of Venezuela, these activities are focused on the areas of telecommunications, Earth observation, research and development space and has as a primary goal the satisfaction of social needs. This analysis offers the elements most important of the Venezuelan space policy: technological transfer, capacity building and human training and international cooperation including the new participation of Venezuela in the international charter on space and major disasters. Our analysis shows that Venezuela has the potential to become a space leadership country, promoting the social welfare, integration, and sustainable development of Latin American countries.","PeriodicalId":434418,"journal":{"name":"2017 8th International Conference on Recent Advances in Space Technologies (RAST)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130895087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

A cost efficient spaceborne SAR imagery design tool (SARGUS) 一种具有成本效益的星载SAR图像设计工具

2017 8th International Conference on Recent Advances in Space Technologies (RAST) Pub Date : 2017-06-19 DOI: 10.1109/RAST.2017.8002945

Özgür Sütçüoğlu, B. Hassoy, Zeynep Dinçer Vural

{"title":"A cost efficient spaceborne SAR imagery design tool (SARGUS)","authors":"Özgür Sütçüoğlu, B. Hassoy, Zeynep Dinçer Vural","doi":"10.1109/RAST.2017.8002945","DOIUrl":"https://doi.org/10.1109/RAST.2017.8002945","url":null,"abstract":"Satellite simulators for Synthetic Aperture Radar (SAR) can be categorized into two main classes according to its functional use: System Engineering Simulator or Mission Simulator. A system engineering simulator provides a high fidelity infrastructure for SAR system designers to determine or adjust the parameters of the system to realize the requirements. A Mission Simulator behaves as the whole system for mission planning or training purposes. Such a simulator is a valuable and low cost way for defining the optimum mission parameters for satisfying the needs of the user and training the operators. In this paper we will present a simulator which aims to combine these two main types of simulators in a functionally feasible and maintainable way. The system engineering simulator will provide the data required during the design phase and also it will provide a baseline to extend the Mission Simulator Capabilities for detailed mission analysis or training. At the same time the Mission Simulator will improve the engineering simulator in the early phases of the project to give an insight about the mission to the designers of the payload.","PeriodicalId":434418,"journal":{"name":"2017 8th International Conference on Recent Advances in Space Technologies (RAST)","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114140578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Non-uniformly spaced planarphased array antenna for Ku-band mobile direct broadcasting satellite reception systems

2017 8th International Conference on Recent Advances in Space Technologies (RAST) Pub Date : 2017-06-19 DOI: 10.1109/RAST.2017.8002948

L. Şahin, E. Özyurt, K. Y. Kapusuz, S. Demir, Yakup Şen, U. Oguz

{"title":"Non-uniformly spaced planarphased array antenna for Ku-band mobile direct broadcasting satellite reception systems","authors":"L. Şahin, E. Özyurt, K. Y. Kapusuz, S. Demir, Yakup Şen, U. Oguz","doi":"10.1109/RAST.2017.8002948","DOIUrl":"https://doi.org/10.1109/RAST.2017.8002948","url":null,"abstract":"SATCOM on the move with electrical beam scanning capabilities has found great interest recently due to its low profile and low maintenance cost for both civilian and military applications. Uniformly distributed array elements have been widely used for phased array antennas. However, a growing number of research on non-uniform distributed array has been published. In contrast to uniformly distributed elements, non-uniformly distributed phased arrays provide the designer with a degree of freedom of additional element spacing through their wide-angle scanning property that mitigates mutual coupling between antenna elements and allows placement of microwave circuits beneath the antenna elements. This paper presents the design of a non-uniformly spaced dual-linearly polarized phased array antenna with a wide-angle scanning feature for Ku-band mobile direct broadcasting satellite reception systems. The proposed array is formed using 64 multilayer microstrip antenna elements. This array structure could be a promising candidate for future low-cost microwave and millimeter-wave applications in the mobile satellite communications systems not only for military use but also for civilian applications.","PeriodicalId":434418,"journal":{"name":"2017 8th International Conference on Recent Advances in Space Technologies (RAST)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129857088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fault tolerant control of attitude dynamics of nanosatellites 纳米卫星姿态动力学容错控制

2017 8th International Conference on Recent Advances in Space Technologies (RAST) Pub Date : 2017-06-19 DOI: 10.1504/ijsa.2018.10015446

Demet Cilden Guler, C. Hajiyev, Janset Dasdemir

引用次数: 0