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서버에서 효율적인 메모리 사용량을 제공하는 공개키 기반 검색 암호 시스템
권은정(Eun Jeong Kwon),서재우(Jae Woo Seo),이필중(Pil Joong Lee),박영만(Young Man Park),이해규(Hae Gyu Rhy),김영헌(Yeong Heon Kim),정학진(Hak Jin Chong) 한국정보보호학회 2008 정보보호학회논문지 Vol.18 No.4
검색 가능 암호 시스템 (Searchable Encryption)은 암호화된 데이터에서 키워드를 검색하는 문제를 해결하기 위하여 2000년에 Song 등에 의해서 처음으로 제안되었다. 지금까지 대칭키 암호화 방식과 공개키 암호화 방식에 기반하는 여러가지 검색 가능 암호 시스템이 제안되었으나, 공개키 암호화 방식에 기반한 기존의 기법들은 암호화 된 문서의 검색을 위해 서버에서 저장해야 하는 인덱스들의 크기가 키워드 개수에 비례하여 선형적으로 증가하는 단점을 가진다. 본 논문에서는 공개키 기반 검색 가능 암호 시스템에서 서버에서 저장하는 인덱스의 길이를 줄이기 위해 Bloom Filter를 적용하는 방법을 제안하고, Boneh 등이 제안한 PEKS(Public key Encryption with Keyword Search)에 제안한 방법을 적용하여, 메모리 측면에서 그 효율성을 분석한다. In 2000, Song. et. al. firstly proposed the Searchable Keyword Encryption System that treated a problem to search keywords on encrypted data. Since then, various Searchable Keyword Encryption Systems based on symmetric and asymmetric methods have been proposed. However, the Searchable Keyword Encryption Systems based on public key system has a problem that the index size for searching keywords on encrypted data increases linearly according to the number of keyword. In this paper, we propose the method that reduces the index size of Searchable Keyword Encryption based on public key system using Bloom Filter, apply the proposed method to PEKS(Public key Encryption with Keyword Search) that was proposed by Boneh. et. al., and analyze efficiency for the aspect of storage.
사구체 여과율 측정을 위한 한국인의 신장 깊이에 관한 방정식 도출과 이용
이성용,김성훈,김현미,이형구,정현석,박영하,손형선,정용안,정수교,유이령,이해규 대한핵의학회 2000 핵의학 분자영상 Vol.34 No.5
Purpose: There is no established formula for estimating renal depths in Korean. As a result, we undertook this study to develop a new formula, and to apply this formula in the calculation of glomerular filtration rate (GFR). Materials and Methods: We measured the renal depth (RD) on the abdominal CT obtained in 300 adults (M:F=167:133, mean age 50.9 years) without known renal diseases. The RDs measured by CT were compared with the estimated RDs based on the Tonnesen and Taylor equations. New formulas were derived from the measured RDs in 200 out of 300 patients based on several variables such as sex, age, weight, and height by multiple regression analysis. The RDs estimated from the new formulas were compared with the measured RDs in the remaining 100 patients as a control. In 48 patients who underwent Tc-99m DTPA renal scintigraphy, GFR was measured with three equations (new formula, Tonnesen and Taylor equations), respectively, and compared with each other. Results: The mean values of the RDs measured from CT were 6.9 cm for right kidney of the men (MRK), 6.7 cm for left kidney of the men (MLK), 6.7 cm for right kidney of the women (WRK), and 6.6 cm for left kidney of the women (WLK). The RDs estimated from Tonnesen equation were shorter than the ones measured from CT significantly. The newly derived formulas were 12.813 (weight/height)+0.002 (age)+ 2.264 for MRK, 15.344 (weight/height)+0.011 (age)+0.557 for MLK, 12.936 (weight/height)+ 0.014 (age)+1.462 for WRK and 13.488 (weight/height)+0.019 (age)+0.762 for WLK. The correlation coefficients of the RD measured from CT and estimated from the new formula were 0.529 in MRK, 0.729 in MLK, 0.601 in WRK, and 0.724 in WLK, respectively. The GFRs from the new formula were significantly higher than those from the Tonnesen equation significantly, which was the most similar to normal GFR values. Conclusion: We generated new formulas for estimating RD in Korean from the data by CT. By adopting these formulas, we expect that GFR can be measured by the Gates method accurately in Korean.
드부룬 라덱스이탈식풍선카테터를 이용한 외상성 경동맥해면정맥동루의 치험례
백원현,이재수,하영수,강준기,송진언,이해규,신경섭,박용휘 대한신경외과학회 1985 Journal of Korean neurosurgical society Vol.14 No.4
A case of traumatic carotid-cavernous fistula treated using Debrun's latex detatchable balloon catheter is reported. The patient was a 33-year-old man, who has complaints of proptosis and chemosis of left eye 2 months after motor vehicle accident. The cerebral angiography showed direct fistula between intracavernous portion of internal carotid artery and cavernous sinus as high flow - high pressure type. After complete radiologic and neruologic examination, the fistulous opening was successfully occluded by Debrun's latex detatchable balloon with transient ischemic attack, which was resolved 2 hours after the procedure
무증상 B 형 간염 보균자에서 생긴 이형성 간세포 선종 1예
정규원,김부성,이영석,선희식,한남익,한석원,지미경,이해규,김석헌 대한소화기학회 1992 대한소화기학회지 Vol.24 No.2
The hepatocellular adenoma is a rare benign tumor, occupying on non-cirrhotic liver, especially in man. we experienced a case of hepatocellular adenoma from a 34 year-old, HBs Ag positive, man. The hepatocellular adenoma with severe dysplasia was confirmed by histologic examination after operation.