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A Novel Reversible Data Hiding Scheme for VQ-Compressed Images Using Index Set Construction Strategy
( Chuan Qin ),( Chin-chen Chang ),( Yen-chang Chen ) 한국인터넷정보학회 2013 KSII Transactions on Internet and Information Syst Vol.7 No.8
In this paper, we propose a novel reversible data hiding scheme in the index tables of the vector quantization (VQ) compressed images based on index set construction strategy. On the sender side, three index sets are constructed, in which the first set and the second set include the indices with greater and less occurrence numbers in the given VQ index table, respectively. The index values in the index table belonging to the second set are added with prefixes from the third set to eliminate the collision with the two derived mapping sets of the first set, and this operation of adding prefixes has data hiding capability additionally. The main data embedding procedure can be achieved easily by mapping the index values in the first set to the corresponding values in the two derived mapping sets. The same three index sets reconstructed on the receiver side ensure the correctness of secret data extraction and the lossless recovery of index table. Experimental results demonstrate the effectiveness of the proposed scheme.
A Novel Electronic Voting Mechanism Based on Blockchain Technology
Chuan-Hao Yang,Pin-Chang Su,Tai-Chang Su 한국인터넷정보학회 2023 KSII Transactions on Internet and Information Syst Vol.17 No.10
With the development of networking technology, it has become common to use various types of network services to replace physical ones. Among all such services, electronic voting is one example that tends to be popularized in many countries. However, due to certain concerns regarding information security, traditional paper voting mechanisms are still widely adopted in large-scale elections. This study utilizes blockchain technology to design a novel electronic voting mechanism. Relying on the transparency, decentralization, and verifiability of the blockchain, it becomes possible to remove the reliance on trusted third parties and also to enhance the level of trust of voters in the mechanism. Besides, the mechanism of blind signature with its complexity as difficult as solving an elliptic curve discrete logarithmic problem is adopted to strengthen the features related to the security of electronic voting. Last but not least, the mechanism of self-certification is incorporated to substitute the centralized certificate authority. Therefore, the voters can generate the public/private keys by themselves to mitigate the possible risks of impersonation by the certificate authority (i.e., a trusted third party). The BAN logic analysis and the investigation for several key security features are conducted to verify that such a design is sufficiently secure. Since it is expected to raise the level of trust of voters in electronic voting, extra costs for re-verifying the results due to distrust will therefore be reduced.
Chang, Ching Chuan,Ryu, D. Y.,Park, Cheon Seok,Kim, Jeong-Yoon 충남대학교 생물공학연구소 1999 생물공학연구지 Vol.7 No.-
A cyclic fed-batch bioprocess is designed and a significant improvement of rice α-amylase productivity of recombinant Yarrowia lipolytica is illustrated. A bioprocess control strategy developed and reported here entails use of a genetically stable recombinant cloned for heterologous protein, use of optimized media for cell growth and enzyme production phases, and process control strategy enabling high cell-density culture and high α-amylase productivity. This process control can be achieved through maintaining a constant optimal specific cell growth rate at a predetermined value (i,e., 0.1 h^-1), controlling medium feed rate commensurate with the cell growth rate, and maintaining a high cell-density culture (i,e., 60-70 g/L) for high productivity of cloned heterologous protein. The volumetric enzyme productivity (1,960 units/L · h) achieved from the cyclic fed-batch process was about 3-fold higher than that of the fed-batch culture process (630 units/L·h). ⓒ 1998 John Wiley & Sons, Inc. Biotechnol Bioeng 59: 379-385, 1998.
Chang, Shu-Chuan,Yeh, Hsiu-Chen,Kuo, Yu-Lun 한국간호과학회 2020 Journal of Korean Academy of Nursing Vol.50 No.2
Purpose: This study had two objectives: 1) to develop a scale for the process of exercise engagement (SPEE) for prediabetic individuals (PDIs); 2) to validate a structural model for the process of exercise engagement for PDIs. Methods: A cross-sectional survey with simple random sampling was conducted from September 2013 to December 2015 (in Taiwan). A total of 310 PDIs were enrolled for scale development and model validation via item analysis, factor analyses, and structural equation modeling. The Kuo model was used as the basis for developing the Chinese version of the SPEE for PDIs. Results: The SPEE contains five subscales with a total of twenty-one items that account for 54.9% to 65.9% of the total variance explained for assessing participants’ process of engagement during exercise. For Kuo model validation, the model measures indicated goodness of fit between the Kuo model and sample data. Analysis further revealed a direct effect between the creating health blueprints (CHB) stage and the spontaneous regular exercise (SRE) stage (b=.60). Conclusion: The SPEE includes five subscales for assessing the psychological transition and behavioral expression at each stage of the process of exercise engagement for PDIs. The SPEE for people with prediabetes provides deeper insights into the factors of behavioral change stages that are required to initiate long-term health care outcomes and avoid developing diabetes. These insights are significant as they allow for patient-specific mapping and behavior modification to effect exercise.
Refinement of the Primary Si Particles in Hypereutectic Aluminum Alloy
Chang-Chuan Hsu,Jian-Yih Wang,Jian-Jia Huang,Shyong Lee 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.4
Al-Si alloys, with such excellent properties as low weight, low thermal expansion coefficient, and high wear-resistance, are ideal materials for the automobile and aerospace industries. However, their applications have been hampered by the coarsening of the primary-Si particles in Al-Si alloys. In this study, simple plastic deformation was used to reduce primary-Si particles and to improve the wear-resistance and mechanical strength of Al-Si alloys. Experimental results showed that mechanical rolling decreased the grain size of primary-Si particles in Al-Si alloys and reduced the variation in silicon particle size. After 60%-roll-reduction, the alloy showed an improved tensile strength of 340 MPa, which is attributed to the work hardening of the aluminum matrix and the dispersion strengthening of the primary-Si particles. Data from wear-resistance testing showed that rolling led to a reduction in wear loss. This improvement in wear resistance is due to the particle size refinement of silicon at a high percentage-roll-reduction.
Chuan-Te Tsai,Yung-Ming Chang,Shu-Luan Lin,Yueh-Sheng Chen,Yu-Lan Yeh,Viswanadha Vijaya Padma,Chin-Chuan Tsai,Ray-Jade Chen,Tsung-Jung Ho,Chih-Yang Huang 한국식품영양과학회 2016 Journal of medicinal food Vol.19 No.3
Angiotensin II (Ang II) is a very important cardiovascular disease inducer and may cause cardiac pathological hypertrophy and remodeling. We evaluated a Chinese traditional medicine, alpinate oxyphyllae fructus (AOF), for therapeutic efficacy for treating Ang II-induced cardiac hypertrophy. AOF has been used to treat patients with various symptoms accompanying hypertension and cerebrovascular disorders in Korea. We investigated its protective effect against Ang II-induced cytoskeletal change and hypertrophy in H9c2 cells. The results showed that treating cells with Ang II resulted in pathological hypertrophy, such as increased expression of transcription factors NFAT-3/p-NFAT-3, hypertrophic response genes (atrial natriuretic peptide [ANP] and b-type natriuretic peptide [BNP]), and Gαq down-stream effectors (PLCβ3 and calcineurin). Pretreatment with AOF (60–100 μg/mL) led to significantly reduced hypertrophy. We also found that AOF pretreatment significantly suppressed the cardiac remodeling proteins, metalloproteinase (MMP9 and MMP2), and plasminogen activator, induced by Ang II challenge. In conclusion, we provide evidence that AOF protects against Ang II-induced pathological hypertrophy by specifically inhibiting the insulin-like growth factor (IGF) II/IIR-related signaling pathway in H9c2 cells. AOF might be a candidate for cardiac hypertrophy and ventricular remodeling prevention in chronic cardiovascular diseases.
Analysis and Comparison of EE-type and CC-type Cores for Wireless Power Transfer Systems
Chung-Chuan Hou,Yu-Hsiang Teng,Wen-Pin Chang,Kuei-Yuan Chang 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This study presents a wireless power transfer (WPT) system based on EE-type and CC-type ferrite cores. The push-pull converter is utilized to transfer the power to the secondary side load with a parallel resonant capacitor. The issues of the WPT such as efficiency and air gap are discussed. The analysis and comparison of the EE-type and CC-type cores based on test results is discussed.
Shu-Chuan Chang,Chien-Chih Wang,Her-Yung Wang 사단법인 한국계산역학회 2018 Computers and Concrete, An International Journal Vol.21 No.3
This study used a volumetric method for design. The control group used waste Liquid Crystal Displayplay (LCD) glass powder to replace cement (0%, 10%, 20%, 30%), and the PZT group used Pd-Zr-Ti piezoelectric (PZT) powder to replace 5% of the fine aggregate to make cement mortar. The engineering and the mechanical and electricity properties were tested; flow, compressive strength, ultrasonic pulse velocity (UPV), water absorption and resistivity (SSD and OD electricity at 50 V and 100 V) were determined; and the correlations were determined by linear regression. The compressive strength of the control group (29.5-31.8 MPa) was higher than that of the PZT group (25.1-29 MPa) by 2.8-4.4 MPa at the curing age of 28 days. A 20% waste LCD glass powder replacement (31.8 MPa) can fill up finer pores and accelerate hydration. The control group had a higher 50 V-SSD resistivity (1870-3244 Ω.cm), and the PZT group had a lower resistivity (1419-3013 Ω.cm), meaning that the resistivity increases with the replacement of waste LCD glass powder. This is because the waste LCD glass powder contains 62% SiO2, which is a low dielectric material that is an insulator. Therefore, the resistivity increases with the SiO2 content.