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한지용,윤상필,장인엽,Han, Ji Yong,Yoon, Sang-Pil,Chang, In-Youb 제주대학교 의과학연구소 2018 The Journal of Medicine and Life Science Vol.15 No.1
Digastric and stylohyoid muscles are located in the suprahyoid region. There have been few studies about the general morphology of stylohyoid muscle and its relationship with digastric muscle. During routine educational dissection, unusual insertion of bilateral stylohyoid muscle was found in the cadaver of a 92-year-old Korean male, whose cause of death was 'aspiration pneumonia'. Stylohyoid muscle arose from the styloid process, and inserted onto the intermediate tendon of digastric muscle and the hyoid bone on both sides. Each digastric muscle normally consists of an anterior belly, intermediate tendon and a posterior belly. In this cadaver, there were two anterior bellies on right side while one anterior belly was found on left side. Stylohyoid muscle ran medial to the intermediate tendon of digastric muscle on both sides. The anatomical relationship between stylohyoid and digastric muscles was reviewed based on morphological and embryological point of view.
SBR 공정에서 운전조건의 변화에 따른 하수중의 질소 인 제거
한지용(Ji Yong Han),허목(Mock Huh) 한국물환경학회 1999 한국물환경학회지 Vol.15 No.2
This study was performed to evaluate the effects of the ratio of aeration/mixing time, the fill tires and the repeat cycle of aeration/mixing, for the removal of organics, nitrogen and phosphorus in sewage by sequencing batch reactor process. The results of this study were summarized as follows; (1) As the ratio of aeration/mixing time was lower and the fill time was longer, the ORP showed a greater potential difference and the pH values was maintained in a more stable state on microbes because the consumption rate of alkalinity was deceased. (2) The organics removal efficiency was increased with increasing the ratio of aeration/mixing time, the fill time and the repeat cycle of aeration/mixing, and it was the highest when the repeat cycle of aeration/mixing was 6 times/cycle. (3) The TSS removal efficiency exceeded 93% and it was not affected by the ratio of aeration/mixing time, the fill time and the repeat cycle of aeration/mixing. (4) The T-N removal efficiency was increased as the ratio of aeration/mixing time was lower and the fill time was longer. Especially, the T-N removal efficiency was the highest when the repeat cycle of aeration/mixing was 6 times/cycle. (5) The T-P removal efficiency showed a great difference in each operating condition, it was influenced greatly by the ratio of aeration/mixing time and the repeat cycle of aeration/mixing among the operating conditions, and it was the highest in the run which the denitrification rate was the highest.
Signature-Based IDS의 PCRE 성능 개선 방안
한지용(Jiyong Han),이인복(Inbok Lee),한정희(Junghee han) 한국정보과학회 2013 정보과학회논문지 : 시스템 및 이론 Vol.40 No.2
최근 폭발적인 인터넷 사용의 증가와 맞물려 발생하는 보안 문제들에 대응하기 위한 시스템으로 Signature-Based 방식의 IDS가 각광받고 있다. 변형이 많고 고정 문자열로 표현될 수 없는 공격들을 탐지하기 위해 IDS에서는 Perl 호환 정규 표현식(PCRE) 엔진을 지원하고 있으나 속도가 느려 표본 문자열(Sample String) 등의 편법을 사용하고 있는 현실이다. 본 논문에서는 시그니쳐 기반 IDS의 PCRE 탐지 성능을 높이기 위한 방법으로 중복되는 PCRE를 가진 시그니쳐 규칙들의 병합과 PCRE를 가진 규칙의 Just-in-Time (JIT) 컴파일을 제안하고, 실험을 통하여 제안된 방법의 효율성을 검증하였다. Recently Signature-Based IDS is being spotlighted as a solution for security problems of arising explosive Internet use. For detecting the variant attacks which cannot be expressed as a static string like buffer overflow attack, IDS supports Perl Compatible Regular Expression (PCRE) engine. However, because of the relatively low speed of the PCRE engine, IDS uses sample string method as an expedient in reality. In this paper, we suggest PCRE rule merging and application of the PCRE JIT compilation to Signature-Based IDS, and verified the efficiency of proposed methods by simulation.