Rocket Safety Control Intelligent Decision System

Li Ya,Zhang Jian-xun,Xiao Zhao-hui 보안공학연구지원센터 2015 International Journal of Security and Its Applicat Vol.9 No.8

Various unpredictable faults often occur when the rocket is on mission. It is very important that the safety control decision is made in time and effectively according to judging and analyzing the fly parameters. The expert system for rocket safety control based on uncertain reasoning is proposed according to the characteristics of parameters. At first the reasoning control strategy is studied on, which provides the method for resolving the conflicts and the search. Then a novel uncertain reasoning model is put forward, and the knowledge’s uncertain representation and processing, the uncertain match algorithm and the certainty factor deliver method are expressed. Simulation experiments show that this system can acquire the craft launching information quickly and accurately, and can determine its sphere of influence, which effectively makes decision for the safety control officer.

MICRO INJECTOR BASED ON DIGITAL DRIVE AND CONTROL FOR BIOMEDICAL ENGINEERING

Liya Hou,Weiyi Zhang,Lili Mu,Li Zhu 제어로봇시스템학회 2003 제어로봇시스템학회 국제학술대회 논문집 Vol.2003 No.10

A comparative study to measure the sagittal condylar inclination using mechanical articulator, virtual articulator and jaw tracking device

Liya Ma,Fei Liu,Jiansong Mei,Jiarui Chao,Zhenyu Wang,Jiefei Shen 대한치과보철학회 2023 The Journal of Advanced Prosthodontics Vol.15 No.1

Purpose. To compare the sagittal condylar inclination (SCI) in dentate individuals measured by the different methods with mechanical articulator (MA), virtual articulator (VA), and a jaw tracking device (JTD) system. Materials and methods. A total of 22 healthy dentate participants were enrolled in this study. For MA workflow, the SCI was obtained by a semi-adjustable articulator with protrusive interocclusal records. The SCI was also set on a VA by aligning intraoral scan (IOS) with cone beam computed tomography (CBCT) and facial scan (FS), respectively. These virtual workflows were conducted in a dental design software, namely VAIOS-CBCT and VAIOS-FS. Meanwhile, a JTD system was also utilized to perform the measurement. Intraclass correlation was used to assess the repeatability within workflows. The bilateral SCI values were compared by Wilcoxon matched-pairs signed rank test for each workflow, and Kruskal-Wallis test and post hoc p-value Bonferroni correction were used to compare the differences among four workflows. The agreement of VAIOS-CBCT, VAIOS-FS, and JTD compared with MA was evaluated by Bland-Altman analysis. Results. Intraclass correlation of the SCI revealed a high degree of repeatability for each workflow. There were no significant differences between the left and right sides (P > .05), except for VAIOS-CBCT (P = .028). Significant differences were not found between MA and VAIOS-FS (P > .05). Bland-Altman plots indicated VAIOS-CBCT, VAIOS-FS, and JTD were considered to substitute MA with high 95% limits of agreement. Conclusion. The workflow of VAIOS-FS provided an alternative approach to measure the SCI compared with MA.

On the modeling methods of small-scale piezoelectric wind energy harvesting

Liya Zhao,Yaowen Yang 국제구조공학회 2017 Smart Structures and Systems, An International Jou Vol.19 No.1

The interdisciplinary research area of small scale energy harvesting has attracted tremendous interests in the past decades, with a goal of ultimately realizing self-powered electronic systems. Among the various available ambient energy sources which can be converted into electricity, wind energy is a most promising and ubiquitous source in both outdoor and indoor environments. Significant research outcomes have been produced on small scale wind energy harvesting in the literature, mostly based on piezoelectric conversion. Especially, modeling methods of wind energy harvesting techniques plays a greatly important role in accurate performance evaluations as well as efficient parameter optimizations. The purpose of this paper is to present a guideline on the modeling methods of small-scale wind energy harvesters. The mechanisms and characteristics of different types of aeroelastic instabilities are presented first, including the vortex-induced vibration, galloping, flutter, wake galloping and turbulence-induced vibration. Next, the modeling methods are reviewed in detail, which are classified into three categories: the mathematical modeling method, the equivalent circuit modeling method, and the computational fluid dynamics (CFD) method. This paper aims to provide useful guidance to researchers from various disciplines when they want to develop and model a multi-way coupled wind piezoelectric energy harvester.

On Speeding up the Neural Network Learning by Adaptive tuning of the Learning Rate

Liya Hou,Kajiro Watanabe,Kazumasa Serizawa 대한전자공학회 1994 ICONIP : International Conference On Neural Inform Vol.3 No.2

On Speeding up the Neural Network Learning by Adaptive tuning of the Learning Rate

Liya Hou,Kajiro Watanabe,Kazumasa Serizawa 대한전자공학회 1994 ICONIP : International Conference On Neural Inform Vol.3 No.3

Influence of and Sn on the Structure and Magnetic Properties of NdFeNB Magnets

Li Liya,Yi Jianhong,Peng Yuan Dong 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1

Addition of 2.0wt% or 0.3wt%Sn proved to be very effective in improving the permanent magnetic properties of NdFeNbB magnets. additions result in the increase in the Hci and temperature dependence due to formation of (NdDy)-rich phase and grain refinement of phase. This improvement of the coercivity stability of the magnets from the addition of Sn is attributed to the smoothing effect of the Sn addition at the grain boundaries. The magnetic properties, the temperature dependence and Curie temperature of NdFeNbB with and Sn combined addition were found to be considerably improved

An Efficient Routing in Urban Vehicular Ad Hoc Networks

Xu Liya,Deng Anyuan,Gao Guangyong,Yang Wenzhong,Cheng Yong 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.8

VANET is a highly mobile wireless ad hoc network that is targeted to support road safety, traffic monitoring and other applications. The node communication is easy to break due to the high mobility of vehicles and the road layout. In this paper, we propose an efficient routing based on static node assistance. The static nodes are fixed in each intersection. Each static node stores information of other static nodes in path. The routing takes static nodes as backbone nodes and vehicles as relay nodes between static nodes. The static nodes are selected dynamically and sequentially, and they are chosen according to the delay that packets are forwarded from the current static node to the candidate one. The vehicular relay selection between two static nodes considers the link stability as the parameter. Simulation results show performance improvement comparing with performance of other existing routing approaches.

자율 주행 공간 디자인의 오감 특성에 관한 연구

풍리아 ( Feng Liya ),박태욱 ( Park Tae Wook ) 한국공간디자인학회 2023 한국공간디자인학회논문집 Vol.18 No.8

(연구배경 및 목적) 본 연구의 목적은 인간 중심주의 관점에서 과학 기술과 사회 문화의 발전이 디자인과 기술 발전에 미치는 필연성을 탐구하는 것이다. 경제적으로 빠르게 발전하는 현대에서는 시각적 즐거움뿐만 아니라 다중 감각 및 다원적 체험을 더욱 갈망하며, 제품이 제공하는 기쁨과 존재감을 심리 및 정신적인 다양한 측면에서 느끼기를 원한다. 이에 대해 본 논문은 디자인과 기술의 결합체로 불리는 자율 주행을 주제로 선정했다. 자율 주행은 기술적인 복잡성뿐만 아니라 사용자 경험, 안전성, 사용 가능성 등 디자인 측면을 고려해야 하는 영역이다. 그러므로 자율 주행에 현대 감각 디자인의 응용을 강화하여 감각 중심 디자인을 강조하고자 한다. (연구방법) 본 논문은 크게 문헌 연구와 실증 연구로 분류하여 연구를 진행하였다. 먼저 인간주의적인 관점의 기술 디자인을 고안하기 위해 문헌연구를 통하여 오감의 특징과 만족성을 분석하여 제시했다. 오감 중 시각, 청각, 후각, 촉각의 디자인을 통해 자율 주행 차의 요소를 분석하고 자율 주행 차 서비스의 디자인적 특성을 명확히 하고자 하였다. 다음으로 위 내용을 바탕으로 설계한 설문조사를 실시하여 오감을 기준으로 하는 자율 주행 공간 디자인 변화의 만족도를 확인했다. (결과) 기술과 인본주의적 시각으로 두고 시각, 촉각, 후각, 청각을 분석한 결과, 세 가지 감각이 만족도에 유의미한 결과를 보였고 한 가지 감각은 그렇지 않은 것으로 나타났다. 유의미한 결과를 보인 감각은 만족도가 높은 순서에 따라 시각, 촉각, 후각인 것으로 나타났다. 이 감각들을 적용하여 개선한 자율 주행 공간 디자인에 사용자의 반응은 긍정적이었다. 반면 청각은 만족도를 검증하기 위한 분석에서 수치적으로 유의미한 결과를 보이지 않았다. (결론) 자율 주행 기술의 미래는 사용자 요구와 기술 혁신을 충족하기 위해 지속적으로 발전하고 진화할 것으로 보이며 이에 따른 공간 디자인 영역의 발전이 요구된다. 본 연구에서 유의미한 결과를 보인 시각, 청각, 촉각 요소를 중심으로 공간 디자인을 구현하면 몰입감 있는 경험과 개인화된 즐거움을 제공할 것으로 기대한다. 또한 기술적인 차원에서의 환경 친화성 및 지속 가능성에 더하여 사용자의 심리적 안정감과 건강에 기여할 수 있을 것으로 보인다. 그러므로 자율 주행 기술 및 디자인의 지속적인 혁신과 개선을 통해 사용자의 요구와 사회적 기대에 부응할 것을 기대한다. (Background and Purpose) The purpose of this study is to explore the inevitability of the development of science and technology and social culture on the development of design and technology from the perspective of anthropocentrism. In the modern era of rapid economic development, people crave not only visual enjoyment but also multi-sensory and multi-disciplinary experiences and want to feel the joy and presence provided by products in various aspects of psychology and spirituality. In this regard, this thesis has chosen autonomous driving as a topic, which is a combination of design and technology. Autonomous driving is an area that requires consideration of not only technical complexity but also design aspects such as user experience, safety, and usability. Therefore, it would like to emphasize sensory-centered design by strengthening the application of modern sensory design to autonomous driving. (Method) This thesis is divided into two main parts: literature research and empirical research. First, the characteristics and satisfaction of the five senses were analyzed and presented through literature research to devise a technology design from a humanistic perspective. Among the five senses, the elements of autonomous vehicles were analyzed through the design of sight, hearing, smell, and touch, and the design characteristics of autonomous vehicle services were clarified. Next, a survey designed based on the above was conducted to check the satisfaction level of autonomous driving space design changes based on the five senses. (Results) As a result of analyzing sight, touch, smell, and hearing from a technological and humanistic perspective, three senses showed significant results for satisfaction, but one did not. The senses that showed significant results were, in order of satisfaction, sight, touch, and smell. Users responded positively to the improved autonomous driving spatial design by applying these senses. On the other hand, hearing did not show numerically significant results in the analysis to verify satisfaction. (Conclusions) The future of autonomous driving technology is expected to continue to develop and evolve to meet user demands and technological innovations, requiring advances in the area of spatial design. Implementing spatial design centered on visual, auditory, and tactile elements that showed significant results in this study is expected to provide immersive experiences and personalized enjoyment. It is also expected to contribute to users' psychological stability and health, in addition to environmental friendliness and sustainability at the technical level. Therefore, it anticipates meeting user needs and social expectations through continuous innovation and improvement in autonomous driving technology and design.

A Study on the Relationship between Policy Acceptance Degree and Teachers’ Professional Identity Focused on Free Tuition Normal University Students of China

요려아(Yao, Liya),김용기(Kim Yong Ki) 학습자중심교과교육학회 2020 학습자중심교과교육연구 Vol.20 No.19

무상교육사범대생의 교사 전문적 정체성은 장기종사, 평생 종사에 아울러 중국 빈곤 지역의 교육 질을 높이는 데 중요한 의미를 갖는다. 교육 정책은 교사 전문적 정체성에 영향을 미치는 요소 중 하나로, 본고의 목적은 양자의 관계를 분석하는 데 있다. 본고는 중국 무상교육 사범대생 528명을 대상으로 설문 조사 후, 통계기술분석, 차별성 분석, 관련 분석, 회귀분석을 실시했다. 그 결과는 다음과 같다. 첫째 무상교육사범대생의 정책 수용도는 높은 수준에 있었고, 학년 및 지원요인 두 변수에 따라 현저한 차이를 보였다. 둘째, 무상교육사범대생의 교사 전문적 정체성도 높은 수준에 있었고, 전공과 지원요인 변수에 따라 현저한 차이를 보였다. 셋째, 정책 수용도와 교사 전문적 정체성은 현저한 적극적인 상관관계를 보였다. 넷째, 정책 수용도는 교사 전문적 정체성에 대해 예측 가능 효과가 있었다. 또한 본 연구 결과에 이어 그에 따른 방안을 제시할 수 있었다. The teachers’ professional identity of FTNUS is of great significance for their long-term and lifelong teaching, thereby improving the education quality in poor areas in China. Education policy is one of the factors that influence teachers’ professional identity. The purpose of this study is to analyze the relationship between the two. This study used 528 FTNUSs in China as the research subject, conducted a questionnaire survey, and conducted descriptive statistical analysis, differences analysis, correlation analysis and regression analysis. The results show that: First, the overall level of FTNUSs policy acceptance degree is at a relatively high level. In grade, application reasons, there are significant differences. Second, the overall level of teachers’ professional identity is at a relatively high level. In major, application reasons, there are significant differences. Third, there is a significant positive correlation between teachers’ professional identity and policy acceptance degree. Fourth, policy acceptance degree has a predictive effect on teachers’ professional identity. According to the research results, the corresponding suggestions are put forward.