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- Hao, Qi, et al.
(författare)
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Cooperative Scheduling for Inter-Enterprise Manufacturing Resources Sharing
- 2003
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Konferensbidrag (refereegranskat)abstract
- This paper presents a cooperative virtual enterprise approach targeting the manufacturing resource sharing among small and medium enterprises. With intelligent agents and Web Services technologies being adopted, the proposed approach possesses a number of distinguishing characteristics, such as loosely-coupled distributed architecture, internal privacy protection, secure separation of information and autonomous operation. An enterprise model, partner search and selection mechanisms, coordination modes and operation monitoring mechanisms are presented in details. The proposed approach emphasizes the enterprise to maximize its profitability, which is always regarded as a higher priority over other concerns.
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| 7. |
- Xu, Y., et al.
(författare)
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A Security Framework for Collaborative Distributed System Control at the Device-Level
- 2003
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Ingår i: INDIN 2003. - : Institute of Electrical and Electronics Engineers (IEEE). - 0780382005 ; , s. 192-198
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Konferensbidrag (refereegranskat)abstract
- In today's globalized business world, outsourcing, joint ventures, and cross-border collaborations have led to work environments that are geographically distributed across organizational and national boundaries. There are critical research needs to develop highly secured collaborative work environments and security solutions for deployment, configuration, monitoring, and device control of interoperating services. We present a well-shaped security framework for distributed system control with a focus on device-level system control, monitoring and services reconfiguration in open and dynamic environments. The characteristics of portability, reconfigurability, interoperability, and interchangeability of these new environments are considered as key factors to produce new security risks and challenges. By adopting public key cryptography, software agent and XML binding technologies, the major security problems of authenticity, integrity, confidentiality, and safe execution are addressed in this framework. The core modules for secure task delivery and execution are presented in detail.
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| 8. |
- Zhou, Qi, et al.
(författare)
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Phase transition of thermosensitive amphiphilic cellulose esters bearing olig(oxyethylene)s
- 2000
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Ingår i: Polymer Bulletin. - : Springer Science and Business Media LLC. - 0170-0839 .- 1436-2449. ; 45:05-apr, s. 381-388
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Tidskriftsartikel (refereegranskat)abstract
- A series of cellulose esters bearing olig(oxyethylene)s with different degree of substitution (DS) and different length of the oxyethylene chain were synthesized by a homogeneous reaction of cellulose with corresponding monofunctional acid chloride in a 10% LiCl-dimethyl acetoamide (DMAc) solution. The effect of total DS value on the solubility of the derivatives in aqueous solution was investigated. It was found that the lower limit DS value for both water-soluble and amphiphilic derivatives decreases with increasing length of oxyethylene chains. The amphiphilic derivatives, which are soluble in both water and chloroform, precipitate out of aqueous solution on heating without gel forming, such a phase transition behavior was studied in terms of DS value, length of oxyethylene and concentration. The precipitation temperature (T-p) of the amphiphilic derivatives is range from 54 degreesC to 96 degreesC. It decreases with increasing the total DS value, and increases with an increase in the length of oxyethylene chains. The T-p value of the derivatives was found to be almost independent in the concentration range of 1-15 wt %, however the T-p value increases sharply with decreasing polymer concentration when the concentration is lower than 1 wt%.
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| 9. |
- Zhou, Qi, et al.
(författare)
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Synthesis and properties of O-2- 2-(2-methoxyethoxy) ethoxy acetyl cellulose
- 2001
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Ingår i: Journal of Polymer Science Part A. - 0887-624X .- 1099-0518. ; 39:3, s. 376-382
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Tidskriftsartikel (refereegranskat)abstract
- In this article, a series of O-2-[2-(2-methoxyethoxy)ethoxy] acetyl celluloses with different degree of substitution (DS) values was synthesized by a homogeneous reaction of cellulose with 2-[2-(2-methoxyethoxy)ethoxy] acetyl chloride in a 10% (w/w) dimethylacetamide/lithium chloride solution, combined with pyridine as the acid acceptor. The total DS values of the derivatives in anhydroglucose units was determined by H-1 and C-13 NMR spectra, and ranged from 0.4 to 3.0, depending on the amount of acid chloride in the reaction. The effects of the total DS values and the O-2-[2-(2-methoxyethoxy)ethoxy]acetyl acetyl substituent distribution on the solubility of the derivatives were investigated. The lowest limit of the DS value for water-soluble 0-2-[2-(2methoxyethoxy)ethoxy]acetyl cellulose was approximately 0.5, which is lower than that of methylcellulose. The amphiphilic derivatives with higher DS values than 1.7 exhibited a good solubility in both water and organic solvents, such as dimethyl sulfoxide, tetrahydrofuran, and chloroform. Sol-gel transition in aqueous solution was observed for the amphiphilic derivatives with a higher DS value than 1.7; the precipitation temperature (T-p) decreased as the DS value increased, showing that the derivatives are highly temperature sensitive. The thermal properties of the fully substituted derivative were measured using polarized microscopy, DSC, and X-ray diffraction; and are dis cussed in terms of phase transition of the sample derivatives.
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