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BBISS(Broad Band Internet Service via Satellite)Ka-band Broadband Satellite Plan
Tatsukawa, Kenichi,Akinaga, Wakoto,Yamada, Kenichi,Hashimoto, Katsumasa,Okui, Tamio,Koishi, Yoichi,Horiuch, Yasuo 통신위성우주산업연구회 2004 Joint Conference on Satellite Communications Vol.2004 No.-
Broadband internet, by ADSL, fiber optic, and CATV circuit has become very popular. However this service can not be shared in the depopulated area, where Broadband service business is difficult to materialize. BBISS satellite has been planned to provide the Broadband service to these un-equipped areas. In order to do so, a wide Ka frequency band is utilized and moreover, multi-beam antenna is adopted to realize the improvement of the efficient frequency reuse and to succeed in earth station antenna miniaturization. As for the problematic matter in use of the Ka-band due to great rainfall attenuation will be solved by use of adaptive code modulation method and realize high availability, and high=speed information speed will be provided in case of fine weather by maintaining the necessary minimum margin. This paper introduces best effort service by BBISS with such features.
A Framework for User Privacy Protection Using Trusted Programs
Kenichi Takahashi,Zhaoyu Liu,Kouichi Sakurai,Makoto Amamiya 보안공학연구지원센터 2007 International Journal of Security and Its Applicat Vol.1 No.2
The evolution of mobile technologies enables us to realize ubiquitous computing environments. In such environments, a user’s mobile terminal manages the sensitive information and assists in various activities based on the user’s information. At the same time, information leakage will become a serious social problem. In this paper, we propose a framework to protect the sensitive information of users in a manner they consider safe. In the framework, the user provides a trusted program that implements the manner he/she considers safe. The information recipient accesses user’s sensitive information through this trusted program. In this manner, the user can protect his/her sensitive information. However, there exist several challenges in the realization of this framework. In this paper, we propose a method for generating a trusted program and discuss the solutions to other challenges.
Drop Metastasis of Adrenocorticotropic Hormone-Producing Pituitary Carcinoma to the Cauda Equina
Kenichi Takeuchi,Yoko Hagiwara,Koichi Kanaya,Keiji Wada,Masahiro Shiba,Yoshiharu Kato 대한척추외과학회 2014 Asian Spine Journal Vol.8 No.5
The diagnosis of pituitary carcinoma cannot be made easily histologically, and most cases of pituitary carcinoma are diagnosed only after the clinical detection of metastasis. Distant metastasis of pituitary tumor occurs in 0.1% to 0.2% of cases and has been reported in the liver, bone and central nervous system, with only one case of metastasis to the cauda equine reported. This study describes a rare case of the drop metastasis of adrenocorticotropic hormone-producing pituitary adenocarcinoma to the cauda equina, causing cauda equina syndrome.
Regional Strategy and Structure of Japanese Multinational Enterprises
Kenichi Yasumuro 慶北大學校 經濟經營硏究所 1993 經商論集 Vol.21 No.2
The strategic responses of Japanese multinational corporations(MNCs) in 1990s can be characterized as regionlization(Ohmae 1986, Nomura Research 1990, Fujii 1991) and symbolized by the establishment of regional headquarters(Hanada 1991A,B, Takahashi 1990, Yasumuro 1992). In this article author analyses the nature of regional strategy of Japanese MNCs and describe logical consequence of regional re-organization process. In part II, forces which stimulate regionalism are examined. In part III, a functional model of regional structure is developed through analyses of interview research. In part IV, as a case study, Matsushita Electric Industries'(Panasonic) regional structure is investigated. In part V, governance cost issues and the attitude of RHQ management is examined. In conclusion, heterarchy as a new concept of organization is presented in connection with Japanese management.