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최대식(Dae-Sik Choi),강형우(Hyoung-Woo Kang),남건우(Geon-Woo Nam) 한국정보과학회 2002 한국정보과학회 학술발표논문집 Vol.29 No.2Ⅰ
인터넷의 발달과 이로 인한 보안의 중요성이 점점 강조되고 있다. 이에 IDIP나 CITRA[3]같은 여러 가지 보안 도구와 시스템의 통합을 통한 전역적인 보안 관리 체계가 대두되고 있는 실정이다. 그러나 이들 대부분이 자신들의 관리영역에 한정하여 이미 결정된 맵을 사용함으로 실제 인터넷에 적용하기에는 많은 어려움이 있다. 인터넷을 통한 전역적이고 실질적인 보안 관리를 하기 위해서는 알려지지 않은(unknown) 망인 인터넷에 대한 정확한 맵핑이 이루어져야 하며, 이를 이용하여 공격자의 공격 경로와 지리학적 위치 판단, DoS 대응을 위한 망의 고립 또는 차단 등의 응용에 이용될 수 있다. 이에 본 논문에서는 맵핑을 위한 여러 가지 휴리스틱한 기법을 소개하고 이를 이용하여 인터넷 맵핑을 위한 프레임워크를 제안한다. 제안된 프레임워크는 기존 방법들의 여러 가지 장점을 취합하여 보다 세밀하고 정확한 맵핑에 효과적이다.
최대식(Choi Dae Sik),성장환(Seong Jang Hwan) 한국도시행정학회 2010 도시 행정 학보 Vol.23 No.1
This study aims to forecast the future demand for residential land in each municipality and the whole country. To this end, this study develops two separate models: a per capita living space estimation model and a population projection model. For the former, the whole country is classified into seven municipality groups and a model is established for each group. According to the results, county residents in the non-capital region are expected to have the largest per capita living space of 32.93m' in 2020, while city residents in the capital region to have the smallest of 25. 39m'. The future population of each municipality is projected with the use of Cohort survival method and regression method. In terms of the population increase rate, Yongin ranks the highest, followed by Gwangju(Gyeonggi), Paju, Hwaseong and Ansan. All of them are located in the capital region. Based on these results, the future demand for additional housing space and residential land is derived. By 2020, an additional housing space of 50lkIn', or 5.9 million housing units, are expected to be needed, with the demand for new residential development area reaching 767km', By city, Bucheon is found to have the highest ratio of the demand for new residential area in comparison with 'urban area' designated by the National Land Planning Law, followed by Anyang, Suweon, Seoul and Seongnam. By municipality group, Seoul/Incheon ranks the highest with the annual rate of 0.79 percent, followed by cities in the capital region, and metropolises in the non-capital region. Counties in the non-capital region are forecasted to have the annual rate of 0.06 percent, far lower than other groups.
최대식(Dae-Sik Choi),김인혁(In-Hyuk Kim),손영익(Young-Ik Son) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.11
DC 모터의 전류 제어는 회전에 의해 발생하는 역기전력을 외란으로 취급하여 역기전력을 보상하는 방법이 많이 사용된다. 본 논문에서는 속도 센서를 사용할 수 없는 모터 응용 분야에서 상태 관측기를 사용하여 전류 제어기를 구성하는 문제를 다룬다. 제안된 관측기는 간단한 1차 모델에 대한 PI 관측기로 설계되며 역기전력을 추정하는 형태로 구성된다. 실험을 통해 제안한 관측기가 1차 모델만을 고려하여 설계되었음에도 DC 모터의 불확실성에 강인한 성능을 보임을 확인한다.
타액선 종양에 있어서 S-100 단백과 Lactoferrin에 관한 면역조직화학적 연구
최대식(Dae Sik Choi),김상효(Sang Hyo Kim) 대한두경부종양학회 1993 대한두경부 종양학회지 Vol.9 No.1
Immunohistochemical studies on S-100 protein and lactoferrin were carried out to evaluate the existence and distribution pattern of S-100 protein and lactoferrin positive cells in salivary gland tumors. The specimens used were 25 cases of pleomorphic adenoma, 2 cases of monomorphic adenoma, 2 cases of mucoepidermoid tumor, 2 cases of acinic cell tumor, 3 cases of adenoid cystic carcinoma and 2 cases of adenocarcinoma occured in parotid and submandibular salivary gland. ABC kits(Dako corp. Copenhagen. Denmark) for S-100 protein and lactoferrin were used. The results obtained were summarized as follows: In the normal salivary gland. positive immunoreaction for S-100 protein was observed in myoepithelial cells of acini and intercalated ducts. Positive immunoreaction for lactoferrin was observed in serous acinic cells, epithelial cells of intercalated ducts, and excretory material in the ductal lumina. In the pleomorphic and monomorphic adenomas. most of tumor cells were positive for S-100 protein, while luminal tumor cells in gland-like or duct-like structures were rarely positive for lactoferrin. In mucoepidermoid tumor, most of squamous cells and a few of intermediate cells were positive for S-100 protein, but all of tumor cells were negative for lactoferrin. In acinic cell tumor, most of tumor cells were positive for lactoferrin, but all of tumor cells were negative for S-100 protein. In adenoid cystic carcinoma, basaloid tumor cells in trabecular structure were focally positive for S-100 protein. and in adenocarcinoma, many of tumor cells were posivive for both S-100 protein and lactoferrin. Thus, according to the embryonic stage of the development of the tumor cell origin, it was possible to classify the salivary gland tumor as followings: mucoepidermoid carcinoma which originated from the earliest stage, acinic cell tumor which originated from the end stage. Between these two extremes, there were pleomorphic adenoma, adenoid cystic carcinoma and adenocarcinoma which originated in the middle stage of the development of .the salivary glands. Based on the above results, it can be stated that S-100 protein is demonstrated in tumor cells orginated from myoepithelial cells and lactoferrin in glandular differentiated tumor cells.