Keyword : mathematical optimization

The Huffman Tree Problem with Upper-Bounded Linear Functions
Hiroshi FUJIWARA Yuichi SHIRAI Hiroaki YAMAMOTO 
Publication:   
Publication Date: 2022/03/01
Vol. E105-D  No. 3 ; pp. 474-480
Type of Manuscript:  Special Section PAPER (Special Section on Foundations of Computer Science - New Trends of Theory of Computation and Algorithm -)
Category: 
Keyword: 
algorithm, combinatorial optimization, mathematical optimization, binary tree, Huffman coding, 
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Overloaded Wireless MIMO Switching for Information Exchanging through Untrusted Relay in Secure Wireless Communication
Arata TAKAHASHI Osamu TAKYU Hiroshi FUJIWARA Takeo FUJII Tomoaki OHTSUKI 
Publication:   
Publication Date: 2021/10/01
Vol. E104-B  No. 10 ; pp. 1249-1259
Type of Manuscript:  Special Section PAPER (Special Section on Dynamic Spectrum Sharing for Future Wireless Systems)
Category: 
Keyword: 
wireless MIMO switching, physical layer security, mathematical optimization, 
 Summary | Full Text:PDF
Analysis of Lower Bounds for Online Bin Packing with Two Item Sizes
Hiroshi FUJIWARA Ken ENDO Hiroaki YAMAMOTO 
Publication:   
Publication Date: 2021/09/01
Vol. E104-A  No. 9 ; pp. 1127-1133
Type of Manuscript:  Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category: Algorithms and Data Structures
Keyword: 
bin packing problem, online algorithm, competitive analysis, mathematical optimization, 
 Summary | Full Text:PDF
Asymptotic Approximation Ratios for Certain Classes of Online Bin Packing Algorithms
Hiroshi FUJIWARA Yuta WANIKAWA Hiroaki YAMAMOTO 
Publication:   
Publication Date: 2021/03/01
Vol. E104-D  No. 3 ; pp. 362-369
Type of Manuscript:  Special Section PAPER (Special Section on Foundations of Computer Science — New Trends of Theory of Computation and Algorithm —)
Category: 
Keyword: 
bin packing problem, online algorithm, competitive analysis, mathematical optimization, 
 Summary | Full Text:PDF
Massive MIMO Antenna Arrangement Considering Spatial Efficiency and Correlation between Antennas in Mobile Communications
Kiyoaki ITOI Masanao SASAKI Hiroaki NAKABAYASHI 
Publication:   
Publication Date: 2020/05/01
Vol. E103-B  No. 5 ; pp. 570-581
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
massive MIMO, mathematical optimization, channel response, correlation coefficient, ray-tracing, 
 Summary | Full Text:PDF