{"title":"Independent component analysis communication using complex spreading sequence with constant power","authors":"Hiroki Matsuyama, Minghui Kao, K. Umeno","doi":"10.14495/jsiaml.15.37","DOIUrl":"https://doi.org/10.14495/jsiaml.15.37","url":null,"abstract":"","PeriodicalId":42099,"journal":{"name":"JSIAM Letters","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85621574","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}
Regulated egress, a method in which people are divided into several groups and each group is allowed to egress in turn, is used at large event venues to avoid congestion in the surrounding area. In this study, we developed an index that considers people’s egress time and congestion during the waiting period to evaluate regulated egress. Then, using simulation and theoretical analysis, we determined the appropriate number of groups to use when conducting regulated egress.
{"title":"Effective regulated egress at large event venues","authors":"Riku Miyagawa, Daichi Yanagisawa, Xiaolu Jia, Katsuhiro Nishinari","doi":"10.14495/jsiaml.15.113","DOIUrl":"https://doi.org/10.14495/jsiaml.15.113","url":null,"abstract":"Regulated egress, a method in which people are divided into several groups and each group is allowed to egress in turn, is used at large event venues to avoid congestion in the surrounding area. In this study, we developed an index that considers people’s egress time and congestion during the waiting period to evaluate regulated egress. Then, using simulation and theoretical analysis, we determined the appropriate number of groups to use when conducting regulated egress.","PeriodicalId":42099,"journal":{"name":"JSIAM Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135710485","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}
Multivariate polynomial public cryptography is a form of post-quantum cryptography that represents one of the candidates for next-generation cryptography. Solving a multivariate simultaneous system of quadratic equations (MQ problem) serves as the basis of security for multivariate public-key cryptography, and evaluating its computational complexity is an important topic. The hybrid approach is a method for solving MQ problems, which combines exhaustive search and Gröbner basis computation. We propose a new algorithm as an alternative to the hybrid approach, wherein the Gröbner basis computation is performed, the assignment calculation is performed subsequently, and the Gröbner basis computation is performed again.
{"title":"Development of hybrid approach for solving MQ problem: Intermediate hybrid approach","authors":"Kosuke Sakata","doi":"10.14495/jsiaml.15.109","DOIUrl":"https://doi.org/10.14495/jsiaml.15.109","url":null,"abstract":"Multivariate polynomial public cryptography is a form of post-quantum cryptography that represents one of the candidates for next-generation cryptography. Solving a multivariate simultaneous system of quadratic equations (MQ problem) serves as the basis of security for multivariate public-key cryptography, and evaluating its computational complexity is an important topic. The hybrid approach is a method for solving MQ problems, which combines exhaustive search and Gröbner basis computation. We propose a new algorithm as an alternative to the hybrid approach, wherein the Gröbner basis computation is performed, the assignment calculation is performed subsequently, and the Gröbner basis computation is performed again.","PeriodicalId":42099,"journal":{"name":"JSIAM Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135710806","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}
The images that our eyes perceive are slightly different from the objects. Images in visual space are illusions. However, they are indeed based on optics. In physical space, parallel lines never intersect. In visual space, however, parallel lines intersect at the vanishing point. This is not limited to the human eye; camera lenses produce images similarly. If visual space is spherical, the phenomenon of intersecting parallel lines is no mystery. This paper provides a new geometric model considering the intersection of parallel lines at vanishing points.
{"title":"Geometric model in visual space","authors":"Hiroyuki Nishimoto","doi":"10.14495/jsiaml.15.105","DOIUrl":"https://doi.org/10.14495/jsiaml.15.105","url":null,"abstract":"The images that our eyes perceive are slightly different from the objects. Images in visual space are illusions. However, they are indeed based on optics. In physical space, parallel lines never intersect. In visual space, however, parallel lines intersect at the vanishing point. This is not limited to the human eye; camera lenses produce images similarly. If visual space is spherical, the phenomenon of intersecting parallel lines is no mystery. This paper provides a new geometric model considering the intersection of parallel lines at vanishing points.","PeriodicalId":42099,"journal":{"name":"JSIAM Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136047604","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}
This paper proposes a data analysis method using persistent homology and nonnegative matrix factorization. A concatenated persistence image technique is used to extract coexisting structures from the persistence diagrams of different dimensions hidden behind the data. To demonstrate the potential of our method, we apply the method to 3D voxel data of iron ore sinters obtained by X-ray computed tomography. The analysis successfully captures the coexistence structures in these iron ore sinters.
{"title":"Persistent homology analysis with nonnegative matrix factorization for 3D voxel data of iron ore sinters","authors":"I. Obayashi, M. Kimura","doi":"10.14495/jsiaml.14.151","DOIUrl":"https://doi.org/10.14495/jsiaml.14.151","url":null,"abstract":"This paper proposes a data analysis method using persistent homology and nonnegative matrix factorization. A concatenated persistence image technique is used to extract coexisting structures from the persistence diagrams of different dimensions hidden behind the data. To demonstrate the potential of our method, we apply the method to 3D voxel data of iron ore sinters obtained by X-ray computed tomography. The analysis successfully captures the coexistence structures in these iron ore sinters.","PeriodicalId":42099,"journal":{"name":"JSIAM Letters","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2022-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87562732","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}
It is important to study the global behavior of solutions to systems of ordinary differential equations describing the transmission dynamics of infectious disease. In this paper, we present a different approach from the Lyapunov function used in most of them. This approach is based on the Poincaré compactification. We then apply the method to a SIR endemic model as a test case, and discuss its effectiveness and the potential applications of this approach. In addition, we refine the discussion of dynamics near the equilibrium, derive the asymptotic behavior, and mention its relation to the basic reproduction number.
{"title":"On global behavior of a some SIR epidemic model based on the Poincaré compactification","authors":"Yutaka Ichida","doi":"10.14495/jsiaml.14.65","DOIUrl":"https://doi.org/10.14495/jsiaml.14.65","url":null,"abstract":"It is important to study the global behavior of solutions to systems of ordinary differential equations describing the transmission dynamics of infectious disease. In this paper, we present a different approach from the Lyapunov function used in most of them. This approach is based on the Poincaré compactification. We then apply the method to a SIR endemic model as a test case, and discuss its effectiveness and the potential applications of this approach. In addition, we refine the discussion of dynamics near the equilibrium, derive the asymptotic behavior, and mention its relation to the basic reproduction number.","PeriodicalId":42099,"journal":{"name":"JSIAM Letters","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2022-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76048700","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}
{"title":"Application and performance evaluation of a method using block structures for saddle point problems appearing in image reconstruction problems","authors":"Shota Ishikawa, Hiroto Tadano, A. Saitoh","doi":"10.14495/jsiaml.14.115","DOIUrl":"https://doi.org/10.14495/jsiaml.14.115","url":null,"abstract":"","PeriodicalId":42099,"journal":{"name":"JSIAM Letters","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78851861","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}
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