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Recent Progress and Surface-Related Key Issues in III-V Semiconductor Nanoelectronics
Hideki Hasegawa 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.3
Recent trends toward a ``ubiquitous network society" have opened up new horizons for III-V nanoelectronics based on nanostructures which will have much wider application areas than they do today. In this paper, recent progresses and issues of III-V nanoelectronics are reviewed, focusing on achievements by the author's group. As for nanostructure fabrication, a combination of top-down and bottom-up approaches, instead of the traditional top-down approach applied to multi-layer epitaxial wafers is required to form high-density nanostructure networks. As such, a selective molecular beam epitaxy growth of nanowire networks is presented and discussed. Large-scale integration of quantum nanodevices requires a new combination of system architecture and hardware architecture, such as the hexagonal (BDD) quantum logic circuit approach. The remaining key issue is the removal of surface states and Fermi level pinning from surfaces of nanostructures. Use of a silicon interface control layer (Si ICL) is shown to be promising for this purpose.
Mechanism of One-Legged Jumping Robot With Artificial Musculoskeletal System
Hideki Iijima,Keisuke Sayama,Hiroyuki Masuta,Atsuo Takanishi,Hun-ok Lim 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
This paper describes the mechanism and vertical jumping pattern of a one-legged jumping robot that can mimic the muscular and skeletal system of a human leg. The jumping robot has a waist, a thigh, a shin, a foot, and a toe. Its weight is 12.34 kg, and its height is 1010 mm. It has a total of 13 actuators: 10 mono-articular types and 3 bi-articular types. Two kinds of pneumatic artificial muscles such as mono-articular and bi-articular muscles are installed in the rear and the front of the thigh and shin to antagonize each other. For a vertical jump, a joint angle pattern is developed based on the linear and angular momentum. The effectiveness of the mechanism and the jumping pattern of the robot are verified through simulations and experiments.