A Study of Flexible and Secure Group Distribution Mechanism in DRM System
한국인터넷정보학회 학술발표대회 논문집, Nov 1, 2007
Recently, Group Distribution has attracted increasing attention. It not only offers convenience f... more Recently, Group Distribution has attracted increasing attention. It not only offers convenience for consumer, but also makes possible for group to control the distribution of rights among members flexibly. However, how to distribute the right of Group flexibly and securely is an important point. In this paper, we propose member authentication and key management approach for Group Distribution. Except for Identity Certificate(Cert IC ), we construct another certificate called Group Attribute Certificate(Cert GAC ) to identify whether consumer is a member and which group the consumer belongs to. To detect illegal distribution, we encrypt the Content Encrypt Key(CEK) by another key called Personal Key(PK), which is the hash value of Cert IC , Cert IC , and ContentID. That makes that Only the member holding proper certificates and license can decrypt out CEK and use the content. Furthermore, if content was detected used illegally, we can also trace who did it based on the PK.
As the firewall is a typical network security equipment, it is usually installed at most of inter... more As the firewall is a typical network security equipment, it is usually installed at most of internal/external networks and makes many packet data in/out. So analyzing the its logs stored in it can provide important and fundamental data on the network security research. However, along with development of communications technology, the speed of internet network is improved and then the amount of log data is becoming 'Massive Data' or 'BigData'. In this trend, there are limits to analyze log data using the traditional database model RDBMS. In this paper, through our Method of Analyzing Firewall log data using MapReduce based on NoSQL, we have discovered that the introducing NoSQL data base model can more effectively analyze the massive log data than the traditional one. We have demonstrated execellent performance of the NoSQL by comparing the performance of data processing with existing RDBMS. Also the proposed method is evaluated by experiments that detect the three attack patterns and shown that it is highly effective.
Comparison of the cold-resistance capabilities of four Ligustrum cultivars
Medicinal Plant, 2012
[Objective] To compare the cold-resistance capabilities of four Ligustrum cultivars. [Method] Bas... more [Objective] To compare the cold-resistance capabilities of four Ligustrum cultivars. [Method] Based on semilethal low temperature test and low temperature stress test in phytotron, cold-resistance capabilities of two-year-old seedlings of 4 Ligustrum cultivars were compared at leaf-expansion and shoot-growing stage. [Result] At leaf-expansion and shoot-growing stage, the semilethal low temperatures of Ligustrum×Vicaryi Hort., Ligustrum lucidum Ait., Ligustrum japonicum Thunb. ‘Howardii’ and Ligustrum lucidum Ait. ‘Excelsum Superbum’ were -6.34, -5.69, -4.55 and -3.27 ℃, respectively. SOD activity, soluble protein content, soluble sugar content and MDA content in leaves under low temperature stress were all higher than those under normal temperature. As the low temperature stress enhanced, soluble protein content in leaves firstly enhanced and then decreased. Among the 4 cultivars, soluble sugar content in 3 cultivars firstly increased and then decreased; and MDA content continuously enhanced. [Conclusion] The cold-resistance capabilities of Ligustrum×Vicaryi Hort. and Ligustrum lucidum Ait. were higher than other cultivars; Ligustrum japonicum Thunb. ‘Howardii’ was middling; and Ligustrum lucidum Ait. ‘Excelsum Superbum’ was the worst.
A Study of Selective Encryption for Images using Tree Structures
Journal of Internet Computing and Services, 2009
The increased popularity of multimedia applications places a great demand on efficient data stora... more The increased popularity of multimedia applications places a great demand on efficient data storage and transmission techniques. Some methods have been proposed to combine compression and encryption together to reduce the overall processing time, but they are either insecure or intensive computationally. specially, they are unsuitable to wireless communication of mobile device. We propose a novel solution called partial encryption, We introduce quadtree and zerotree wavelet image compression in this paper, it reduces computation for date transmission in mobile device, and does not reduce the compression rate. In conclusion, the proposed partial encryption schemes are fast, secure, and do not reduce the compression performance of underlying compression algorithm.
Production of manno-oligosaccharide from Gleditsia microphylla galactomannan using acetic acid and ferrous chloride
Food Chemistry, Jun 1, 2021
A novel and efficient method for manno-oligosaccharides (MOS) production has been proposed by uti... more A novel and efficient method for manno-oligosaccharides (MOS) production has been proposed by utilizing Gleditsia microphylla galactomannan as the starting material. This co-operative hydrolysis using ferrous chloride (Fe2+) and acetic acid (HAc) effectively improved the MOS yield and meanwhile decreased the amount of monosaccharide and the 5-hydroxymethyl-furfural (HMF). The highest yields under the optimum conditions were 46.7% by HAc hydrolysis (5 M HAc at 130 °C for 120 min); 37.3% by Fe2+ hydrolysis (0.1 M Fe2+ at 150 °C for 120 min); and 51.4% by co-operative hydrolysis (2 M HAc, 0.05 M Fe2+ at 160 °C for 10 min). From the changes in the value of M/G (mannose/galactose) ratios, it was deduced that Fe2+ predominantly cleaves the main chain, and HAc assists in the breakage of the side chain, thus resulting in the high-efficient co-operative hydrolysis for the production of MOS.
Different stump heights with Toona sinensis bud vegetable yield and commodity characteristics with field coppice management
Journal of Zhejiang A & F University, Apr 20, 2013
As a Chinese traditional food，Toona sinensis bud vegetable has rich nutrition and much benefit fo... more As a Chinese traditional food，Toona sinensis bud vegetable has rich nutrition and much benefit for human body health. Stump is a important method to improve Toona sinensis bud vegetable yield and actualize dwarf and close planting. Up to now，the problem of which is the best stump height for high vegetable yield and good commodity character is not resolved. This paper combined with Toona sinensis low production forest improvement project in Taixing City of Jiangsu Provence in China，objective to provide scientific evidence and reference for Toona sinensis high yeild cultivation. Using two-year-old Toona sinensis seedlings，the effects of different stump heights （0，20，40，60，and 80 cm） on bud vegetable yield and commodity characteristics with field coppice management were studied. Experimental design was one singel factor random repeated test（three times repeated，one repeat used fifty per plant）. Results with stumped seedlings showed （1） significant differences （P＜0.05） for both terminal bud and lateral bud vegetable yield when compared to content of soluble sugars，soluble proteins，vitamin C，and amino acids. Also，sensory quality of the lateral bud had significant differences （P = 0.004），but the terminal bud did not （P = 0.211）. （2） For high bud vegetable yield and sensory quality，the 60 cm stump height treatment was best with a 22.3% greater yield than the 0 cm stump height. （3） Considering terminal bud vegetable nutritional components，the 0 and 20 cm stump height treatments had mostly higher soluble sugar content and vitamin C conten；whereas the 60 and 80 cm stump height treatments had higher soluble protein content and amino acid content.［Ch，3 fig. 18 ref.］
NSA simplification algorithm: geometrical vs. visual quality
Page 1. NSA simplification algorithm: geometrical vs. visual quality Frutuoso GM Silva IT - Netwo... more Page 1. NSA simplification algorithm: geometrical vs. visual quality Frutuoso GM Silva IT - Networks and Multimedia Group Department of Computer Science and Engineering University of Beira Interior, Portugal fsilva@di.ubi.pt Abstract ...
As a common side-chain residue of polysaccharide, galactose plays a significant role in multiple ... more As a common side-chain residue of polysaccharide, galactose plays a significant role in multiple aspects of the macromolecules. This study showed how degalactosylation induced drastic self-assembly transition of xyloglucan from spherical aggregates toward ribbon-like aggregates, and how it led to largely decreased water solubility and apparent viscosity within a short range of galactose removal ratio. To better understand this phenomenon, the size of the ellipsoid-like aggregated nanoparticles were carefully measured and compared, and it was found out that those nanoparticles which lost more galactose residues turned out to be more slender and tend to bind and stack closely in parallel, thereby forming huge ribbon-like aggregates. The galactose residue is considered as the hydrophilic group, and the decreased number of which caused a more hydrophobic behavior.
Adaptive soft erasure with edge self-attention for weakly supervised semantic segmentation: Thyroid ultrasound image case study
Computers in Biology and Medicine, May 1, 2022
[S U M M A R Y] Weakly supervised segmentation for medical images ease the reliance of models on ... more [S U M M A R Y] Weakly supervised segmentation for medical images ease the reliance of models on pixel-level annotation while advancing the field of computer-aided diagnosis. However, the differences in nodule size in thyroid ultrasound images and the limitations of class activation maps in weakly supervised segmentation methods typically lead to under- and/or over-segmentation problems in real predictions. To alleviate this problem, we propose a weakly supervised segmentation neural network approach. This new method is based on a dual branch soft erase module that expands the foreground response region while constraining the erroneous expansion of the foreground region by the enhancement of background features. The sensitivity of this neural network to the nodule scale size is further enhanced by the scale feature adaptation module, which in turn generates integral and high-quality segmentation masks. In addition, while the nodule area can be significantly expanded through soft erase module and scale feature adaptation module, the activation effect in the nodule edge area is still not satisfactory, so that we further add an edge-based attention mechanism to strengthen the nodule edge segmentation effect. The results of experiments performed on the thyroid ultrasound image dataset showed that our new approach significantly outperformed existing weakly supervised semantic segmentation methods, e.g., 5.9% and 6.3% more accurate than the second-based results in terms of Jaccard and Dice coefficients, respectively.
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