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RISS 인기검색어
- 검색키워드
- 저자 : Chih-Chien Hu (검색결과 3 건)
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A Novel Mobile Content Delivery Scenario with Simple Double-Key Secure Access Control
Chih-Lin Hu,Chien-An Cho 보안공학연구지원센터 2009 International Journal of Security and Its Applicat Vol.3 No.1
Under the convergence of fixed and mobile network systems, modern networked devices are often equipped with multiple connectivity modules so that users can access various information services, by means of portable information devices, anytime and anywhere over ubiquitous Internet access connectivity. In this paper, we present a novel secure mobile content delivery mechanism where networked devices in a vicinity can discover each other, transfer media contents in a convenient, networked method instead of ordinary transfer method that involves unfriendly manual operations of connection setup and file transfer. Its design integrates several significant components, including device discovery, mobile content delivery and double-key secure access control, which are able to alleviate several inherent limitations in wireless and mobile networks. It thus enables mobile handheld devices to escape from mobility confinement and to transfer media contents in an efficient, energy-saving and secure manner.
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Thu-Trang Nguyen,Chih-Chien Hu,Rajalakshmi Sakthivel,Sasza Chyntara Nabilla,Yu-Wen Huang,Jiashing Yu,Nai-Chen Cheng,Yi-Jie Kuo,Ren-Jei Chung 한국생체재료학회 2022 생체재료학회지 Vol.26 No.2
Background: All types of movements involve the role of articular cartilage and bones. The presence of cartilage enables bones to move over one another smoothly. However, repetitive microtrauma and ischemia as well as genetic effects can cause an osteochondral lesion. Numerous treatment methods such as microfracture surgergy, autograft, and allograft, have been used, however, it possesses treatment challenges including prolonged recovery time after surgery and poses a financial burden on patients. Nowadays, various tissue engineering approaches have been developed to repair bone and osteochondral defects using biomaterial implants to induce the regeneration of stem cells. Methods: In this study, a collagen (Col)/γ-polyglutamate acid (PGA)/hydroxyapatite (HA) composite scaffold was fabricated using a 3D printing technique. A Col/γ-PGA/HA 2D membrane was also fabricated for comparison. The scaffolds (four layers) were designed with the size of 8 mm in diameter and 1.2 mm in thickness. The first layer was HA/γ-PGA and the second to fourth layers were Col/γ-PGA. In addition, a 2D membrane was constructed from hydroxyapatite/γ-PGA and collagen/γ-PGA with a ratio of 1:3. The biocompatibility property and degradation activity were investigated for both scaffold and membrane samples. Rat bone marrow mesenchymal stem cells (rBMSCs) and human adipose-derived stem cells (hADSCs) were cultured on the samples and were tested in-vitro to evaluate cell attachment, proliferation, and differentiation. In-vivo experiments were performed in the rat and nude mice models. Results: In-vitro and in-vivo results show that the developed scaffold is of well biodegradation and biocompatible properties, and the Col-HA scaffold enhances the mechanical properties for osteochondrogenesis in both in-vitro and animal trials. Conclusions: The composite would be a great biomaterial application for bone and osteochondral regeneration.
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Dental arch wires with tooth-like color
Chen, Sinn-Wen,Wu, Hsin-Jay,Liu, Chih-Hao,Chien, Yuan-Chun,Hu, Chih-Chang Techno-Press 2012 Advances in materials research Vol.1 No.1
Unique tooth-like (milky white) color ${\beta}$-Ti dental arch wires are prepared by anodization in a 1M $H_2SO_4$ electrolyte at $30^{\circ}C$ and 30 V for 88 min and 40 s. Aggregates are formed on these surfaces of the anodized wires with tooth-like colors, and the results are different from those of the anodized wires with monochromatic colors which have smooth oxide surfaces. Similar to the monochromatic wires, the composition of the oxide layer is $TiO_{2-x}$ and the x approaches zero at the outer layer. But different from the amorphous structure observed in monochromatic wires, the oxide layers are partially crystallized with an anatase structure. The milky white colors result from the rough and crystalized oxide layers, not by the interference effect as observed in monochromatic wires.
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