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Fine-Grained and Traceable Key Delegation for Ciphertext-Policy Attribute-Based Encryption
( Jiajie Du ),( Nurmamat Helil ) 한국인터넷정보학회 2021 KSII Transactions on Internet and Information Syst Vol.15 No.9
Permission delegation is an important research issue in access control. It allows a user to delegate some of his permissions to others to reduce his workload, or enables others to complete some tasks on his behalf when he is unavailable to do so. As an ideal solution for controlling read access on outsourced data objects on the cloud, Ciphertext-Policy Attribute-Based Encryption (CP-ABE) has attracted much attention. Some existing CP-ABE schemes handle the read permission delegation through the delegation of the user's private key to others. Still, these schemes lack the further consideration of granularity and traceability of the permission delegation. To this end, this article proposes a flexible and fine-grained CP-ABE key delegation approach that supports white-box traceability. In this approach, the key delegator first examines the relations between the data objects, read permission thereof that he intends to delegate, and the attributes associated with the access policies of these data objects. Then he chooses a minimal attribute set from his attributes according to the principle of least privilege. He constructs the delegation key with the minimal attribute set. Thus, we can achieve the shortest delegation key and minimize the time of key delegation under the premise of guaranteeing the delegator’s access control requirement. The Key Generation Center (KGC) then embeds the delegatee's identity into the key to trace the route of the delegation key. Our approach prevents the delegatee from combining his existing key with the new delegation key to access unauthorized data objects. Theoretical analysis and test results show that our approach helps the KGC transfer some of its burdensome key generation tasks to regular users (delegators) to accommodate more users.
Jiajie Zang,Meihua Shen,Sufa Du,Tianwen Chen,Shurong Zou 한국유방암학회 2015 Journal of breast cancer Vol.18 No.4
Purpose: To date, studies investigating the association between dairy consumption and breast cancer in women have produced conflicting results. As diet is an important, modifiable factor affecting cancer development, the aim of this study was to examine the association between dairy consumption and breast cancer risk. Methods: PubMed, Embase, and Cochrane Library databases were searched with a priority for prospective cohort studies. Case-control studies were also considered in case of the absence of a cohort study. Results: We analyzed 22 prospective cohort studies (1,566,940 participants) and five case-control studies (33,372 participants). High and modest dairy consumption (>600 and 400–600 g/day, respectively) significantly reduced the risk of breast cancer compared with low dairy consumption (<400 g/day; risk ratio [RR], 0.90, 95% confidence interval [CI], 0.83–0.98, and RR, 0.94, 95% CI, 0.91–0.98, respectively). A significant linear relationship between dairy consumption and breast cancer risk was found on dose-response analysis. Subgroup analysis found that yogurt (RR, 0.91; 95% CI, 0.83–0.99) and low-fat dairy (RR, 0.85; 95% CI, 0.75–0.96) reduced the risk of breast cancer, while other dairy product types did not. A reduced risk was observed for people in the United States (RR, 0.91; 95% CI, 0.83–0.99) and in those followed for ≥10 years (RR, 0.90; 95% CI, 0.81–0.99). Additionally, the highest level of dairy consumption among Asians was associated with a reduced risk of breast cancer (odds ratio, 0.74; 95% CI, 0.62–0.88). Conclusion: Dairy consumption was inversely associated with the risk of developing breast cancer and this effect was dependent on the dose, dairy-type, and time.
Effect of Microstructure on the Corrosion Resistance of Nd-Fe-B Permanent Magnets
Jiajie Li,Wei Li,Anhua Li,Rui Zhao,Bin Lai,Minggang Zhu 한국자기학회 2011 Journal of Magnetics Vol.16 No.3
High performance Nd-Fe-B magnets can be manufactured by both sintering and hot deformation. The corrosion behaviors of the magnets prepared by the two processes were compared. Effect of microstructure on the corrosion resistance of Nd-Fe-B magnets was also investigated. A neutral salt spray test (NSS) was performed for the different-processed magnets. The weight losses of the samples after the corrosion test were measured. The corrosion microstructures were observed using a scanning electron microscope. It shows that the corrosion resistance of hot deformed magnets is much better than that of the sintered ones because the grain size and the distribution of Nd-rich phases of the hot deformed magnets are much finer and more uniform than those of the sintered ones. The different microstructure between the sintered and the hot deformed magnets causes the different corrosion behavior.
Observer-based load current sensorless control strategy of inverter circuit in three-phase UPS
Chang, Jiajie,Xiao, Lan The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.1
A load current sensorless control strategy using an optimized observer is designed for a three-phase online transformer-based UPS. A closed-loop observer containing state feedback is constructed based on the improved state space model of the inverter circuit. A simple feedback matrix design method is then applied to the observer according to the dead-beat control law, and the load current feedforward control scheme is reconstructed using the proposed observer. This control strategy can save three load current sensors, reduce the THD of the output voltage, and improve dynamic performance. The effectiveness of this strategy is verified by conducting simulation and experiment in a 10 kVA UPS.
賈捷(JiaJie) 고려대학교 한자한문연구소 2012 동아한학연구 Vol.- No.8
최근 50년 동안《楚辭》주석본과 주석가에 관한 연구가 한창 진행 중에 있다. 오늘날《楚辭》주석본과 주석가 연구 간의 불균형 및 편중성을 인식하며, 본고에서는 朱季海의《楚辭解故》를 중심으로, 주석본 연구, 저자 연구, 史·考·論을 결합한 연구방식을 적용하여 朱季海 선생의 일생과 그의《楚辭》주석인 《楚辭解故》를 전면적·체계적으로 분석함으로써 朱氏의 학문방법론을 다음과 같이 제시하였다. 첫째, 미비한 문제들을 가려내어 楚語·楚事·故書 등을 考?하여 결정하였다. 둘째, 王逸·洪興祖의 학설을 중시하되 다른 名家의 학설도 아울러 논의하였다. 셋째, 내적 증거를 찾아 작품을 변별하였다. 넷째,《楚辭》연구에 다양한 학문 지식과 연구 방법론을 적용하여, 오랜 학문에서 참신한 견해를 도출해내었다. 朱季海의《楚辭解故》가 지닌 이러한 考證的 측면에 관해서는 아직《초사》학계에서 논의되지 않았기에, 본고에서는 토대적 성격의 개별 연구를 통해, 《초사》주석가 및 주석본에 대한 연구 가치를 제고하고 나아가 《초사》학 연구에 현존하는 문제들을 해결하고자 하였다.
A single vesicle-vesicle fusion assay for in vitro studies of SNAREs and accessory proteins
Diao, Jiajie,Ishitsuka, Yuji,Lee, Hanki,Joo, Chirlmin,Su, Zengliu,Syed, Salman,Shin, Yeon-Kyun,Yoon, Tae-Young,Ha, Taekjip Nature Publishing Group, a division of Macmillan P 2012 NATURE PROTOCOLS -ELECTRONIC EDITION- Vol.7 No.5
SNARE (soluble N-ethylmaleimide-sensitive factor attachment protein receptor) proteins are a highly regulated class of membrane proteins that drive the efficient merger of two distinct lipid bilayers into one interconnected structure. This protocol describes our fluorescence resonance energy transfer (FRET)-based single vesicle-vesicle fusion assays for SNAREs and accessory proteins. Both lipid-mixing (with FRET pairs acting as lipophilic dyes in the membranes) and content-mixing assays (with FRET pairs present on a DNA hairpin that becomes linear via hybridization to a complementary DNA) are described. These assays can be used to detect substages such as docking, hemifusion, and pore expansion and full fusion. The details of flow cell preparation, protein-reconstituted vesicle preparation, data acquisition and analysis are described. These assays can be used to study the roles of various SNARE proteins, accessory proteins and effects of different lipid compositions on specific fusion steps. The total time required to finish one round of this protocol is 3??6 d.