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안전한 시스템을 위한 Buffer Overflow 대응기법분석에 관한 연구
조진호(Jin-Ho Jo),황현욱(Hyun-Uk Hwang),박종백(Jong-Baek Park) 한국정보과학회 2000 한국정보과학회 학술발표논문집 Vol.27 No.2Ⅰ
Buffer Overflow는 가장 핵심적인 해킹기법중의 하나이다. 현재 해킹피해의 대부분을 차지하며 local attack 뿐 아니라 remote attack까지 가능하므로 이를 이해함은 보안을 이해하는 차원에서 매우 중요하다. 본 논문에서는 Buffer Overflow의 원리와 최근 발생한 시스템의 해킹 형태를 살펴보고, 이를 방지할 수 있는 기법들을 분석하여 Buffer Overflow에 대응할 수 있는 모습을 그려보고자 한다.
SQLite 데이터베이스의 삭제된 오버플로우 데이터 복구 기법
이규원(Gyu-Won Lee),양승제(Seung-Jei Yang),황현욱(Hyun-Uk Hwang),김기범(Kibom Kim),장태주(Taejoo Chang),손기욱(Ki-Wook Sohn) 한국정보기술학회 2012 한국정보기술학회논문지 Vol.10 No.11
As many applications in smartphone use SQLite database to store data, the recovery of deleted data from the file is very important issue in the field of digital forensics. SQLite database stores data as a unit of the record, and the record is generally stored on the cell of B-tree leaf page. Therefore, the previous researches proposed the record recovery scheme on B-tree leaf page. However they wouldnt recover data of overflow pages that store exceeding available cells in B-tree leaf page. Therefore, they recover data only on the B-tree leaf page. To resolve the problem, we propose a scheme that entirely recovers the deleted data on both the B-tree leaf page and the overflow pages. Experimental results show the proposed scheme entirely recovers the deleted data in the database file of kakaotalk application.
이진영 ( Jin Young Lee ),이수연 ( Soo Yeon Lee ),전혜지 ( Hye Ji Jun ),윤지영 ( Ji Young Yoon ),황현욱 ( Hyun Uk Hwang ),박주훈 ( Joo Hoon Park ),안봉전 ( Bong Jeun An ),손준호 ( Jun Ho Son ),황주영 ( Ju Young Hwang ) 대한본초학회 2012 大韓本草學會誌 Vol.27 No.5
Objectives : Cosmeceutical activities such as anti-oxidative and anti-aging effects of the Doinseunguitang and its composition, a traditional prescription, were evaluated. Methods : We performed MTT assay, melanin synthesis inhibition assay, DPPH free radical scavenging assay, SOD-like activity, xanthine oxidase inhibition assay, astringent activity assay, tyrosinase inhibition assay, elastase and collagenase inhibition assay. Results : The results were obtained as follows : DPPH free radical scavenging of water extract Doinseunguitang (DISG) and ethanol extract DISG was 60% and 50% at 1,000 ppm. Xanthine oxidase inhibition effect of ethanol extract showed more than 80% at 500 ppm. Tyrosinase inhibition and inhibition melanin synthesis activities were measured in 40% and 50% at 1,000 ppm and 100 ppm. Elastase and collagenase inhibition rate of ethanol extracts DISG 40% and 80% at 1,000 ppm. It was concluded that compositive ingredients (Persicae Seman, Glycyrrhizae Radix, Cinnamomi Ramulus, Rhei Rhizoma) influenced the most results. Conclusions : The results indicated that, ethanol extract which is superior in its anti-oxidative and anti-aging effects is useful to be applied in herbal cosmetic industry.
황현욱,한승조 조선대학교 전자정보통신연구소 2001 電子情報通信硏究所論文誌 Vol.4 No.1
The rapid growth of the network-systems with internet’s development overcomes the differences between the time and the distance. Also The development of the Hacking technique is threatening the environment of the network-system severely. In this paper, I grasped the situation of that first, and designed the systems to collect their attack information on the basis of the Linux on the network. It was designed the host system in general and laid out the firewall, router and the Linux-systems not to miss the procedure of the invader’s succeeding in attack and it was described to prevent the abuse from the data-controlling point of view.
한약재의 중금속 평가 연구 : 경북북부지역 한약재를 중심으로 Cultivated Herbal Medicines at North Gyeongbuk Area
박문기,김승영,황현욱 한국환경과학회 2004 한국환경과학회지 Vol.13 No.12
We compared with heavy metal concentration of herbal medicines in products of Gyeongbuk and the other area of Korea. The concentration of heavy metal were studied for the estimation of quality in herbal medicines which is Bupleuri Radix, Paeoniae Radix, Dioscoreae Rhizoma and Astragali Radix in products of north Gyeongbuk area. The average levels of heavy metal of herbal medicines in Gyeongbuk area are as follows : Mercury is 0.037mg/kg, Chromium is 0.093mg/kg, Nickel is 0.108mg/kg, Copper is 0.475mg/kg, Zinc is 3.14mg/kg, Manganese is 1.52mg/kg, Iron is 7.83mg/kg, and Cadmium, Lead and Arsenic is not detected. It was very lower in concentrations than those of average Korea area. Therefore, Gyeongbuk area appear to be more proper to cultivated land than other area. Minerals such as Ca and K were extracted more than Na and P in herbal medicines products of Gyeongbuk respectively. Minerals and heavy metal concentrations distributed in herbal medicines were analyzed. Little or no relationship was observed between minerals and heavy metals.