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- 저자 : Zhao Yixuan (검색결과 6 건)
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Fast Finite-time Adaptive Fuzzy Control for Stochastic Nonlinear System
Yixuan Yuan,Junsheng Zhao,Yaqi Gu,Xuejing Zhao,Zong-Yao Sun 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.12
In this article, we solve the fast finite-time stabilization as well as adaptive fuzzy control design issues for a class uncertain stochastic nonlinear systems. Firstly, a new fast finite-time control scheme is proposed in virtue of generalizing the fast finite-time adaptive control strategy for deterministic systems to the stochastic case. Next, a novel adaptive fuzzy control strategy is developed to simultaneously deal with the stochastic nonlinear systems with completely unknown nonlinearities as well as the disturbances term. Then, stability analysis have been given based on a Jensen’s inequality. Finally, two simulations examples is presented to illustrate the effectiveness of the proposed control scheme.
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The Dynamic Access Control Model for Cloud Web Based on Repeated-game Theory
Yixuan Zhang,Jingsha He,Bin Zhao 보안공학연구지원센터 2015 International Journal of Grid and Distributed Comp Vol.8 No.4
Access control, what is a core technology in information security, has been widely used cloud web. It is used to distribute objects’ resources to subjects according to some principles. But until now, most traditional access control models are focused on the distributional principles; the security of systems is always ignored. Protecting data and resources in computers from threats and attacks is also an important aspect in access control, especially in cloud web where there are a great deal of threats and attacks. In this paper, we introduce the present situation and related work of access control. Then we analyze the security problems in computer systems with traditional access control model, and get the prisoner’s dilemma in it through Nash equilibrium. To solve this dilemma, we applied repeated-game theory to access control and build a new model RTAC. The ultimate goal of RTAC is to encourage subjects’ honest accesses and discourage subjects’ malicious accesses through Nash equilibrium. At last, we perform some experiments and show the advantages of RTAC over the traditional access control model.
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Designs and Simulations of Multi-factor in Trust Evaluation
Zhao Bin,He Jingsha,Huang Na,Zhang Yixuan,Zhou Shiyi,Ji Jie 보안공학연구지원센터 2015 International Journal of Database Theory and Appli Vol.8 No.1
Trust Model is an efficient way of resolving the trust problems in open networks in which trust evaluation is a key issue to be addressed in trust management. According to the design rules of trust models, the problem of the lack of dynamic adapt ability in trust evaluating, the lack of effective aggregation of trust and the lack of considerations to incentive mechanisms and so on, this paper introduced the bonus-penalty factor which shows how reliable is the direct trust of the recommend entities to the subject and evaluation reliability of the recommend entities which is used to decide whether the access object would adopt the recommendation of the recommend entities during the calculation of the recommend trust. The measurement of integrated trust solves the weight problem between direct trust and recommendatory trust by introducing balanced weight factor. Finally, we present designs of bonus-penalty function and balanced weight factor and simulations by Matlab software.
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UDGAN: A new urban design inspiration approach driven by using generative adversarial networks
干薇,Zhao Zichen,Wang Yuankai,Zou Yixuan,Zhou Shiqi,오지강 한국CDE학회 2024 Journal of computational design and engineering Vol.11 No.1
The morphological design of urban space affects the quality of the environment. The traditional experience-based design approach was greatly improved by introducing computational design tools. However, the existing urban design tools are mostly developed on pre-set rules or given targets, which have few contributions to enhance creativity or generate inspiring schemes. Therefore, this paper proposes a new computational urban design approach named UDGAN, integrating generative adversarial networks (GANs) and multi-objective optimization algorithms. This model utilizes urban design scheme plans over the past 20 years from a particular designer as training datasets. Four preference models were trained to autonomously generate stylized urban design schemes. Eight morphological parameters were used to analyze the model performance by comparing generated results with the ground truth. This GAN-based surrogate approach is combined with a morphological indicator alignment process using multi-objective optimization model to obtain better results. The result shows that the R2 predicted by the improved Pix2Pix model reaches 0.798, and the similarity of the generated results can be stably distributed between 0.7 and 0.8, so the design scheme of this preferred style can be effectively learned. At the same time, the pre-trained model greatly reduces the time consumption of the design scheme generation, taking 5 min approximately to complete a generation process. This approach quickly generated the design scheme with preferred features, supporting the designer with creativity and greatly saving the time of design creation, transforming computational design into an inspiration-driven process.
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정지선 ( Ji-sun Jung ),조의훤 ( Yixuan Zhao ),유민지 ( Min-ji Yu ),최원회 ( Won-hoe Choi ),연익준 ( Ik-jun Yeon ) 한국폐기물자원순환학회(구 한국폐기물학회) 2017 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2017 No.-
우리나라의 폐기물 발생량은 인구증가, 경제성장, 삶의 질 향상에 의해 꾸준히 증가하고 있으며, 증가하는 폐기물에 ‘자원화’로 인식을 전환시켜 재사용, 재활용하기 위한 다양한 정책을 추진중에 있다. 또한 자원화 방법 외에 소각 등의 처리를 한 후 매립장에 매립하고 있다. 자원화 방법 외에 소각과 매립의 방법으로 발생되는 폐기물을 적정하게 처리하기 위해서는 환경기초시설의 설치가 필수적이고, 환경기초시설(매립시설, 소각시설)의 설계 및 용량을 결정하기 위해서는 발생되고 있는 폐기물에 대한 정확한 분석과정이 우선시 되어야 하며, 이 과정은 매우 중요하다고 할 수 있다. 더욱이 소각시설의 경우 대기오염, 악취, 자원에 대한 낭비 등의 문제를 야기할 가능성이 높기 때문에, 소각시설의 적정 운전을 위하여 폐기물에 대한 물리·화학적 분석과 발열량에 대한 기초자료는 소각시설 설계 시 매우 중요 인자로 활용되고 있다. 하지만 소각시설 설계 시 고려되었던 폐기물에 대한 기초 자료로 설정한 소각시설의 운전조건이 실제로 소각시설이 운영되었을 때를 얼마만큼 유지하고 있는지는 지속적인 조사가 필요할 것이다. 왜냐하면 시간이 지나면서 사람들의 소비패턴이 변하며, 발생되는 폐기물의 양과 성분도 변하기 때문이다. 이에 본 연구에서는 인구 22만 명 정도의 중소도시를 대상으로 소각시설이 운영되고 있는 지역을 선정하였고, 선정된 지역의 과거부터 현재까지의 발생되고 있는 생활폐기물의 특성을 분석하고자 하였다. 생활폐기물의 변화특성을 조사·분석하기 위하여, 겉보기밀도, 삼성분분석, 발열량분석 등을 수행하였다. 향후 이 자료는 충주시에서 소각시설 운영을 위한 최적의 운전인자를 도출하는데 중요 자료로 활용될 수 있으며, 폐기물관리 정책수립 및 처리에 기초자료로 제시하고자 한다.
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Circ_0026359 induces HOXA9 to regulate gastric cancer malignant progression through miR‑140‑3p
Lu Shuirong,Lu Jinlai,Liu Lang,Sun Yilong,Zhao Yixuan,Tan Xi,Li Jingze 한국응용생명화학회 2022 Applied Biological Chemistry (Appl Biol Chem) Vol.65 No.4
Recent researches indicate the key role of circRNA in gastric cancer (GC) progression. However, the role of circ_0026359 in GC progression remains unclear. This study aims to analyze the role of circ_0026359 in GC development and the underlying mechanism. The results showed that compared with controls, GC tissues and cells displayed high circ_0026359 and HOXA9 expression, and low miR-140-3p expression. Depletion of circ_0026359 repressed cell proliferation, migration, invasion and glycolysis, and induced cell apoptosis. Circ_0026359 knockdown inhibited neoplasm growth in vivo. Under-expression of miR-140-3p, a target miRNA of circ_0026359, relieved the effects of circ_0026359 knockdown on GC progression. Additionally, HOXA9 was regulated by the circ_0026359/miR-140-3p axis. Thus, circ_0026359 absence inhibited GC progression by miR-140-3p/HOXA9 pathway, which provided an effective therapeutic target for GC.
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