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노한샘,염홍열 순천향대학교 부설 산업기술연구소 2001 순천향 산업기술연구소논문집 Vol.7 No.2
Key recovery system provide an efficient method to access the plaintext of the normal encrypted communication channel. The key recovery is also called "key escrow". Key recovery becomes a very important tool for the electronic commerce applications, considering that number of clients requiring the key recovery function will increase rapidly. We have presented the three-type of key recovery methods which are known as Key Escrow scheme, Key Encapsulation, and Trusted Third Party scheme. And we have compared these three schemes. Finally we have analyzed the existing key recovery products which have been developed for electronic commerce and electronic government. We propose the key recovery policy for the e-commerce and e-government system. The result of this study can be used to design the key recovery products and to install this key recovery products.
Breast Tissue Reconstruction Using Polycaprolactone Ball Scaffolds in a Partial Mastectomy Pig Model
Shim Kyu-Sik,Ryu Da Hye,조한샘,김기범,Kim Do-Hyun,Park Yong-Kyu,Heo Min,Cho Hee-Eun,윤을식,이원재,노태석,송승용,백우열 한국조직공학과 재생의학회 2023 조직공학과 재생의학 Vol.20 No.4
BACKGROUND: Breast cancer patients suffer from lowered quality of life (QoL) after surgery. Breast conservancy surgery (BCS) such as partial mastectomy is being practiced and studied as an alternative to solve this problem. This study confirmed breast tissue reconstruction in a pig model by fabricating a 3-dimensional (3D) printed Polycaprolactone spherical scaffold (PCL ball) to fit the tissue resected after partial mastectomy. METHODS: A 3D printed Polycaprolactone spherical scaffold with a structure that can help adipose tissue regeneration was produced using computer-aided design (CAD). A physical property test was conducted for optimization. In order to enhance biocompatibility, collagen coating was applied and a comparative study was conducted for 3 months in a partial mastectomy pig model. RESULTS: In order to identify adipose tissue and fibroglandular tissue, which mainly constitute breast tissue, the degree of adipose tissue and collagen regeneration was confirmed in a pig model after 3 months. As a result, it was confirmed that a lot of adipose tissue was regenerated in the PCL ball, whereas more collagen was regenerated in the collagen-coated Polycaprolactone spherical scaffold (PCL–COL ball). In addition, as a result of confirming the expression levels of TNF-a and IL-6, it was confirmed that PCL ball showed higher levels than PCL–COL ball. CONCLUSION: Through this study, we were able to confirm the regeneration of adipose tissue through a 3-dimensional structure in a pig model. Studies were conducted on medium and large-sized animal models for the final purpose of clinical use and reconstruction of human breast tissue, and the possibility was confirmed.