http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 최철훈 (검색결과 114 건)
- 무료
- 기관 내 무료
- 유료
-
최철훈,유민수 한국정보처리학회 2024 정보처리학회논문지. 소프트웨어 및 데이터 공학 Vol.13 No.2
비밀공유 기법은 개인키와 같은 비밀을 복수의 지분으로 분할하여 분산 관리함으로써 비밀의 보안성을 높이는 기술이다. 그동안 다양한 상황에서비밀공유를 적용하기 위한 많은 연구가 있어 왔으며, Tassa가 제안한 논리곱 기반의 비밀공유 방법은 도함수를 사용하여 계층적 비밀공유를 가능하게하는 방법이다. 하지만 도함수를 사용하는 계층적 비밀공유는 몇 가지 한계를 가진다. 첫째, 각 레벨의 지분들이 하나의 도함수로부터 생성되기때문에 하나의 레벨에 하나의 참여자 그룹만을 만들 수 있다. 둘째, 논리곱에 기반한 비밀 복원만 가능하여 임의의 비밀 복원 조건을 규정할 수없다. 셋째, 도함수를 사용하기 때문에 버크호프 보간법을 필요로 하며, 이는 다항식 기반 비밀공유에 사용되는 라그랑주 보간법에 비해 구현이복잡하고 어렵다. 본 논문에서는 논리곱 기반 계층적 비밀공유를 일반화시킨 다중 컴파트먼트 비밀공유 기법을 제안한다. 제안하는 기법은 비밀을복원하는데 필요한 외부지분들을 이용하여 비밀을 암호화하고, 암호화된 비밀 값이 삽입된 다항식을 생성하여 내부지분들을 생성한다. 내부지분들로다항식을 복원할 수는 있지만, 이 때 얻을 수 있는 값은 암호화된 비밀 값이며 복호화를 위해서는 외부지분들이 필요하다. 이 기법을 적용하면하나의 계층에 복수의 참여자 그룹을 만들 수 있으며, 논리곱은 물론 임의의 비밀 복원 조건을 구현할 수 있다. 또한 다항식을 사용함에 따라라그랑주 보간법을 적용하는 것도 가능해진다. Secret sharing is a cryptographic technique that involves dividing a secret or a piece of sensitive information into multiple sharesor parts, which can significantly increase the confidentiality of a secret. There has been a lot of research on secret sharing for differentcontexts or situations. Tassa's conjunctive secret sharing method employs polynomial derivatives to facilitate hierarchical secret sharing. However, the use of derivatives introduces several limitations in hierarchical secret sharing. Firstly, only a single group of participantscan be created at each level due to the shares being generated from a sole derivative. Secondly, the method can only reconstruct asecret through conjunction, thereby restricting the specification of arbitrary secret reconstruction conditions. Thirdly, Birkhoff interpolationis required, adding complexity compared to the more accessible Lagrange interpolation used in polynomial-based secret sharing. Thispaper introduces the multi-compartment secret sharing method as a generalization of the conjunctive hierarchical secret sharing. Ourproposed method first encrypts a secret using external groups’ shares and then generates internal shares for each group by embeddingthe encrypted secret value in a polynomial. While the polynomial can be reconstructed with the internal shares, the polynomial just providesthe encrypted secret, requiring external shares for decryption. This approach enables the creation of multiple participant groups at asingle level. It supports the implementation of arbitrary secret reconstruction conditions, as well as conjunction. Furthermore, the useof polynomials allows the application of Lagrange interpolation.
-
Effects of Snake Venom Pharmacopuncture on a Mouse model of Cerebral Infarction
최철훈,송호섭 대한침구의학회 2019 대한침구의학회지 Vol.36 No.3
Background: This study investigated the effects of Vipera lebetina turanica snake venom (SV) on cerebral infarction induced by middle cerebral artery occlusion in mice. Methods: Following cerebral infarction, SV was injected intravenously or added to BV2 cell culture. Tissue injury was detected using triphenyltetrazolium chloride (TTC) staining, neurological deficit score, NO, ROS, and GSH/GSSG assays, qPCR, Western blot, and cell viability. Results: Cerebral infarction caused by middle cerebral artery occlusion as observed by TTC staining, showed SV inhibited cell death, reducing the number of brain cells injured due to infarction. SV treatment for cerebral infarction showed a significant decrease in abnormal behavior, as determined by the neurological deficit score. The oxidation and inflammation of the cells that had cerebral infarction caused by middle cerebral artery occlusion (NO assay, ROS, GSH/GSSG assay, and qPCR), showed significant protection by SV. Western blot of brain infarction cells showed the expression of iNOS, COX-2, p-IkB-α, P38, p-JNK, p-ERK to be lower in the SV group. In addition, the expression of IkB increased. BV2 cells were viable when treated with SV at 20 μg/mL or less. Western blot of BV2 cells, treated with 0.625, 1.5, 2.5 μg/mL of SV, showed a significant decrease in the expression of p-IkB-α, p-JNK, iNOS, and COX-2 on BV2 cells induced by LPS. Conclusion: SV showed anti-inflammatory and anti-oxidant effects against cerebral infarction and inflammation.
-
-
-
-
末梢性 顔面神經麻痺의 取穴部位에 따른 灸治療 效果 比較
최철훈,송호섭 대한침구의학회 2008 대한침구의학회지 Vol.31 No.3
Objectives : This study was to compare the effect of moxibustion therapy on peripheral facial para- lysis according to location of acupoint. Methods : We investigated 41 cases of inpatients with Peripheral Facial Paralysis, and divided them into two groups, One group was treated by moxibustion on local point(ML), and the other was treated by moxibustion on distant point(MD). We evaluated the effect of moxibustion in each group by using Gross Grading System of House-Brackmann(HB score) and Yanagihara’s Unweighed Grading System(Y score). Results : 1. In ML and MD, compared with baseline, at final, HB score was significantly decreased and Y score was significantly increased. 2. At final, ML showed significant decrease on HB score and significant increase on Y score compared with MD. Conclusions : These results suggested that ML should be more useful for improving symptoms related with peripheral facial paralysis than MD.
-
Film Session Q&A 2 : Retrocaval lymph node resection
최철훈,박진영,윤애라,김태현,최준국,이유영,김태중,이정원,김병기,배덕수 대한산부인과학회 2012 대한산부인과학회 학술대회 Vol.99 No.-
Present an unusual case We performed a laparoscopic retrocaval LN resection in endometrial cancer patients. No complication occurred. The precedure can be feasible.
-
-
-
ScienceON
KISS연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
