20,244 research outputs found
Behavioural access control in distributed environments
No full textApplications and services in distributed environments are an increasingly important topic. Hence approaches to security issues in such applications are also becoming essential. Crucial information is needed to be protected properly and mechanisms must be developed for this protection.
Access control is one of the topics that underline security
problems. It concerns assuring that data or resources are accessed by the correct entities. A commonly used access control approach is called access control lists, which is widely applied in most operating systems. However, this approach has some weaknesses with regard to scalability, and so it is not very suitable for distributed environments that usually have variable populations. Capabilities on the other hand offer scalability and adaptability advantages over access control lists. Capabilities are unforgeable tickets that can be propagated between entities, and fit well in distributed environments. But capabilities also have limits due to their simple structure. They grant infinite number of accesses for given types of actions, but are not able to capture sequences and branches of actions, which may be called aspects of behaviours.
In this thesis, behaviour control approaches are introduced, through Vistas to Treaties. Vistas can provide explicit access control for each component of objects, and provide primitive control over action sequences. Treaties develop behaviour control further by containing behaviour descriptors which can specify those sequencing, branching and terminating aspects, and hence can provide much finer
control over behaviours. Because treaties inherit the scalable attributes of capabilities, they also fit well in distributed environments.
An interesting feature in treaty systems is that they allow users to refine the specifications of behaviours and generate new treaties from existing ones. A number of treaty combinator operations are proposed to realize this functionality, and they are shown to be safe with respect to the security of access control.
A novel issue created by the treaty approach is identified in the thesis. The new problem is called the duplication problem, which could cause users being able to gain more permissions than they should have by making copies of unprotected treaties. Any treaty systems must provide solutions to this problem. Three models which solve the duplication problem are proposed, with an analysis of their differences, and advantages and disadvantages.
Treaties are a general concept and in real cases they can be represented in various ways. There are components in treaties that have given a variety of implementation options, and the developers of services and applications can choose to combine these options to fit their special requirements. This makes treaties more flexible and adaptable.
The implementations of concreted treaties and treaty systems are introduced, and these implemented treaties are used to test their behaviour control abilities. Evaluations for different treaty representations are provided to compare their performance. Scalability of treaty systems is also evaluated, showing that treaties are good to be deployed in distributed environments
Hui tu zhen ben jing shi mu yu jin gang zuan
No full text著作者余好辯, 伍憤時.Cover title.上下卷.On double leaves, East Asian binding.木魚歌文.zhu zuo zhe Yu Haobian, Wu Fenshi.Shang xia juan.Mu yu ge wen
sj-docx-3-taj-10.1177_20406223221143245 – Supplemental material for Chest X-ray features facilitate screening for pulmonary hypertension caused by fibrosing mediastinitis
No full textSupplemental material, sj-docx-3-taj-10.1177_20406223221143245 for Chest X-ray features facilitate screening for pulmonary hypertension caused by fibrosing mediastinitis by Mingfang Zhou, Bo Li, Yaling Chen, Aqian Wang, Yining Zhu, Yu Li, Hongling Su, Jingchun Fan, Yan Zhang and Yunshan Cao in Therapeutic Advances in Chronic Disease</p
sj-docx-4-taj-10.1177_20406223221143245 – Supplemental material for Chest X-ray features facilitate screening for pulmonary hypertension caused by fibrosing mediastinitis
No full textSupplemental material, sj-docx-4-taj-10.1177_20406223221143245 for Chest X-ray features facilitate screening for pulmonary hypertension caused by fibrosing mediastinitis by Mingfang Zhou, Bo Li, Yaling Chen, Aqian Wang, Yining Zhu, Yu Li, Hongling Su, Jingchun Fan, Yan Zhang and Yunshan Cao in Therapeutic Advances in Chronic Disease</p
sj-docx-6-taj-10.1177_20406223221143245 – Supplemental material for Chest X-ray features facilitate screening for pulmonary hypertension caused by fibrosing mediastinitis
No full textSupplemental material, sj-docx-6-taj-10.1177_20406223221143245 for Chest X-ray features facilitate screening for pulmonary hypertension caused by fibrosing mediastinitis by Mingfang Zhou, Bo Li, Yaling Chen, Aqian Wang, Yining Zhu, Yu Li, Hongling Su, Jingchun Fan, Yan Zhang and Yunshan Cao in Therapeutic Advances in Chronic Disease</p
sj-docx-5-taj-10.1177_20406223221143245 – Supplemental material for Chest X-ray features facilitate screening for pulmonary hypertension caused by fibrosing mediastinitis
No full textSupplemental material, sj-docx-5-taj-10.1177_20406223221143245 for Chest X-ray features facilitate screening for pulmonary hypertension caused by fibrosing mediastinitis by Mingfang Zhou, Bo Li, Yaling Chen, Aqian Wang, Yining Zhu, Yu Li, Hongling Su, Jingchun Fan, Yan Zhang and Yunshan Cao in Therapeutic Advances in Chronic Disease</p
sj-png-2-taj-10.1177_20406223221143245 – Supplemental material for Chest X-ray features facilitate screening for pulmonary hypertension caused by fibrosing mediastinitis
No full textSupplemental material, sj-png-2-taj-10.1177_20406223221143245 for Chest X-ray features facilitate screening for pulmonary hypertension caused by fibrosing mediastinitis by Mingfang Zhou, Bo Li, Yaling Chen, Aqian Wang, Yining Zhu, Yu Li, Hongling Su, Jingchun Fan, Yan Zhang and Yunshan Cao in Therapeutic Advances in Chronic Disease</p
sj-docx-7-taj-10.1177_20406223221143245 – Supplemental material for Chest X-ray features facilitate screening for pulmonary hypertension caused by fibrosing mediastinitis
No full textSupplemental material, sj-docx-7-taj-10.1177_20406223221143245 for Chest X-ray features facilitate screening for pulmonary hypertension caused by fibrosing mediastinitis by Mingfang Zhou, Bo Li, Yaling Chen, Aqian Wang, Yining Zhu, Yu Li, Hongling Su, Jingchun Fan, Yan Zhang and Yunshan Cao in Therapeutic Advances in Chronic Disease</p
sj-png-1-taj-10.1177_20406223221143245 – Supplemental material for Chest X-ray features facilitate screening for pulmonary hypertension caused by fibrosing mediastinitis
No full textSupplemental material, sj-png-1-taj-10.1177_20406223221143245 for Chest X-ray features facilitate screening for pulmonary hypertension caused by fibrosing mediastinitis by Mingfang Zhou, Bo Li, Yaling Chen, Aqian Wang, Yining Zhu, Yu Li, Hongling Su, Jingchun Fan, Yan Zhang and Yunshan Cao in Therapeutic Advances in Chronic Disease</p
Yu Takeuchi
No full textYu Takeuchi is serving for JAXA since 2007 and currently working as Associate Senior Administrator at Management and Integration Department of Human Spaceflight Technology Directorate. He is also working as Researcher at the Institute of Space Law of Keio University. He received LL.M. degree from the Institute of Air and Space Law of McGill University in 2015. His main interest is in international space law inter alia the legal aspects of space traffic management and sustainable space development. He is a member of the Air Law Institute of Japan, Japanese Society of International Law, and the International Institute of Space Law (IISL).
Main Works Published in English
- “Toward the International Regime for Space Traffic Management -What to Fix the Current International Regulations-”, (November 5, 2014). Space Traffic Management Conference, Paper 23 (http://commons.erau.edu/stm/2014/wednesday/23).
- “Regulatory Regime for Tomorrow’s Suborbital Space Flights: Point-to-point International Flights”, 56th Colloquium on the Law of Outer Space, 2013.
- “Space Traffic Management as a Guiding Principle of the International Regime of Sustainable Space Activities,” 4 Journal of East Asia and International Law, 2011
- “Japanese Perspective on Legal Issues of Commercial Human Spaceflight” (co-author), 53rd Colloquium on the Law of Outer Space, 2011
- “Legal Points at Issue about NEO Threat Response and International Cooperation” (co-author), 28th International Symposium on Space Technology and Science, 2011
- “From Guideline to International Treaty for Rule of Law concerning Mitigation of Space Debris?” (co-author), 52nd Colloquium on the Law of Outer Space, 2010
Main Works Published in Japanese (title translated into English)
- “What is Space Traffic Management”, Vol. 46, No.9, Journal of the Japanese Institute of International Business Law, 2018.
- Soichiro Kozuka & Masahiko Sato eds., Introduction of Space Law for Entrepreneur (2nd. Ed.), Yuhikaku, 2018. (co-authored)
-“Challenges to International Space Law for Managing Space Traffic”, 55 Kuho (Air Law), 2014.
-“Legal Points as Issues of NEO Threat Response and International Cooperation” (co-author), 3 Spaceguard Research, Japan Spaceguard Association, 2011https://commons.erau.edu/stm-images/1121/thumbnail.jp
- …
