Antimicrobial resistance, genotype and virulence gene profile of methicillin-resistant Staphylococcus aureus isolated from bovine mastitis milk from 2017 to 2021

Jin-San Moon(Jin-San Moon),Hye Jeong Kang(Hye Jeong Kang),Serim Hong(Serim Hong),Ji-Hye Choi(Ji-Hye Choi),Ha-Young Kim(Ha-Young Kim),Soon-Seek Yoon(Soon-Seek Yoon) 한국예방수의학회 2022 한국예방수의학회 학술대회자료집 Vol.2022 No.-

개발 생산성 향상을 위한 분산 시스템 기반의 프레임워크 설계

최병하(Byung-Ha Choi),최승교(Sung-Kyo Choi),조경산(Kyung-San Cho) 한국컴퓨터정보학회 2012 韓國컴퓨터情報學會論文誌 Vol.17 No.1

본 논문은 분산 시스템 기반에서 경량급 프레임워크의 간단한 개발 주기를 지원하며 분산 처리가 가능한 IPO(Input-Process-Output) 모델 기반의 프레임워크를 제안한다. 제안 프레임워크는 입력 함수, 처리 함수, 출력 함수를 가진 클래스를 개발하면 분산 시스템의 표현 계층과 중간 계층에서 하나의 응용 프로그램으로 실행되도록 지원해준다. 또한 이 기법의 특징으로 응용 프로그램 개발시 분산 시스템 의존적인 부분을 제거하며, 개발-구축-배치-검증의 개발 주기를 개발-검증 주기로 감소시킨다. 이 기법의 생산성 향상과 성능 검증하기 위해 기존의 분산 시스템과 경량급 프레임워크의 응용 프로그램을 제안 기법의 응용 프로그램과 비교 분석한다. 그 결과 상당한 코드 감소와 분산 시스템 의존적인 부분이 감소하여 개발 생산성을 향상시키고 경량급 시스템에 비해 상대적으로 안전적인 성능을 보인다. In this paper, we propose a framework which supports the simple development cycle based on Distributed System using IPO(Input-Process-Output) model. In our proposed framework, once a single class with Input, Process and Output functions is developed, it can be executed like a single application in both presentation layer and middle layer of a distributed system. Our proposed Framework removes dependency on distributed system and makes development cycle decreased from Develop-Build-Deploy-Test cycle to Develop-Test cycle when application programs is developed. The verification of productivity and performance is performed by comparing our Framework with distributed system or lightweight Framework. The results show high productivity due to the considerable amount of reduction in lines of source code and reduction in dependency on distributed system, and show stabler performance than lightweight framework.

HTTP Outbound Traffic 감시를 통한 웹 공격의 효율적 탐지 기법

최병하(Byung-Ha Choi),최승교(Sung-Kyo Choi),조경산(Kyung-San Cho) 한국컴퓨터정보학회 2011 韓國컴퓨터情報學會論文誌 Vol.16 No.1

웹 기반 공격에 대한 대응책으로 계층적 웹 보안 시스템이 있지만 다양한 혼합 및 우회 공격에는 제대로 대응하지 못하는 실정이다. 본 논문은 웹 공격에 의해 발생하는 악성코드 유포, XSS, 웹쉘 생성, URL Spoofing, 개인 정보유출 등의 증상을 HTTP outbound traffic의 감시를 통해 실시간으로 탐지하는 효율적인 기법을 제안한다. 제안 기법은 다양한 웹 공격에 의해 생성되는 HTML 태그와 Javascript 코드를 분석하여 설정한 시그너처를 outbound traffic과 비교 검색하여 웹 공격을 탐지한다. 실제 침입 환경에서의 검증 분석을 통해, 계층적 보안 시스템과 결합된 제안기법이 우회된 웹 공격에 대한 탐지능력이 탁월함을 보인다. A hierarchical Web Security System, which is a solution to various web-based attacks, seemingly is not able to keep up with the improvement of detoured or compound attacks. In this paper, we suggest an efficient detecting scheme for web-based attacks like Malware, XSS, Creating Webshell, URL Spoofing, and Exposing Private Information through monitoring HTTP outbound traffics in real time. Our proposed scheme detects web-based attacks by comparing the outbound traffics with the signatures of HTML tag or Javascript created by the attacks. Through the verification analysis under the real-attacked environment, we show that our scheme installed in a hierarchical web security system has superior detection capability for detoured web-based attacks.

HTTP Outbound Traffic에 HMM을 적용한 웹 공격의 비정상 행위 탐지 기법

최병하(Byung-Ha Choi),최승교(Sung-Kyo Choi),조경산(Kyung-San Cho) 한국컴퓨터정보학회 2012 韓國컴퓨터情報學會論文誌 Vol.17 No.5

본 논문은 HTTP Outbound Traffic의 감시를 통해 다양한 웹 공격의 침입 경로에 대응하고, 학습 효율성을 높여 변종 또는 새로운 기법을 이용한 비정상 행위에 대한 오탐을 낮춘 기법을 제안한다. 제안 기법은 HMM(Hidden Markov Model)을 적용하여 HTML 문서속의 태그와 자바스크립트의 학습을 통한 정상 행위 모델을 생성한 후, HTTP Outbound Traffic속의 정보를 정상 행위 모델과 비교하여 웹 공격을 탐지한다. 실제 침입된 환경에서의 검증 분석을 통해, 제안기법이 웹 공격에 대해 0.0001%의 오탐율과 96%의 우수한 탐지능력을 보임을 제시한다. In this paper we propose an anomaly detection scheme to detect new attack paths or new attack methods without false positives by monitoring HTTP Outbound Traffic after efficient training. Our proposed scheme detects web-based attacks by comparing tags or javascripts of HTTP Outbound Traffic with normal behavioral models which apply HMM(Hidden Markov Model). Through the verification analysis under the real-attacked environment, we show that our scheme has superior detection capability of 0.0001% false positive and 96% detection rate.

Evolution of AgX Nanowires into Ag Derivative Nano/microtubes for Highly Efficient Visible-Light Photocatalysts

Choi, Won San,Byun, Gyo Yeon,Bae, Tae Sung,Lee, Ha-Jin American Chemical Society 2013 ACS APPLIED MATERIALS & INTERFACES Vol.5 No.21

<P>Our study proposes a novel strategy for the synthesis of Ag derivatives (AgX@Ag (X = Cl and Br) or Ag nano/microtubes) using the controlled chemical reduction or electron-beam irradiation of AgX nanowires (NWs), which are formed from the controlled dewetting of a AgX thin film on colloidal particles. The size of the AgX@Ag and Ag nano/microtubes can be controlled using the AgCl NWs as templates and varying the concentration of NaX. By controlling the concentration of NaBr, heterojunction-structured AgCl/AgBr NWs (H-AgCl/AgBr NWs) can be produced from the AgCl NWs due to a partial ion-exchange reaction (low concentration), and the AgBr NWs produced after a complete ion-exchange reaction between Cl- and Br- are further grown into micrometer-sized AgBr wires (high concentration). The resulting AgX NWs can be transformed into corresponding AgX@Ag or Ag nano/microtubes via a controlled chemical or physical method. The AgX derivatives (AgX@Ag nanotubes (NTs) and AgX NWs) are tested as visible-light-induced photocatalysts for decomposition of methyl orange. The AgX@Ag NTs exhibit the best photocatalytic activities due to the advantages of the core@shell structure, allowing multiple reflections of visible light within the interior cavity, providing a well-defined and clean Ag/AgX interface, and preventing direct adsorption of pollutants on AgX because of the shell structure. These advantages allow AgX@Ag NTs to maintain high catalytic performance even after multiple uses. The approach can also be used as a direct method for preparing Ag nano/microtubes with a tailored size and as a new method for incorporating a AgX NW core into a Ag nano/microtube shell. Our approach is useful for synthesizing various types of one-dimensional heterostructured NWs or metal NTs with controlled structures and properties.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2013/aamick.2013.5.issue-21/am4034735/production/images/medium/am-2013-034735_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am4034735'>ACS Electronic Supporting Info</A></P>

Smart Microcapsules Encapsulating Reconfigurable Carbon Nanotube Cores

Choi, Won San,Yang, Hye Min,Koo, Hye Young,Lee, Ha-Jin,Lee, Young Boo,Bae, Tae Sung,Jeon, Il Cheol WILEY-VCH Verlag 2010 Advanced functional materials Vol.20 No.5

<P>The encapsulation of carbon nanotubes (CNTs) to form a reconfigurable conglomerate within iron oxide microcapsules is demonstrated. The individual CNTs conglomerate and form a core inside the capsule upon exposure to high temperature, while they scatter when subjected to mild sonication at low pH. The assembly/disassembly of CNTs within the capsule was reversible and could be repeated by alternate heating and sonication. Also, the fabrication protocol could be used for the generation of various multifunctional hollow structures. To test the feasibility of using the capsules in real applications, the capacity of the capsules as a heavy metal ion remover was explored. The resulting capsules showed an excellent ability to remove lead and chromium ions. In addition, desorption of the metal ions adsorbed on the CNTs could be induced by exposure to low pH. Thus, encapsulated CNTs might be a recyclable, environmentally friendly agent for the removal of heavy metal ions.</P> <B>Graphic Abstract</B> <P>Heavy metal ion removal is demonstrated using carbon nanotubes (CNTs) surrounded by iron oxide microscapsules. The CNTs conglomerate and form a core inside the capsule upon exposure to high temperature, while they scatter when they are subjected to mild sonication under low pH. This assembly/disassembly of the CNTs within the capsule is reversible and can be repeated by alternate heating and sonication. These hierarchical structures can capture lead and chromium ions, which can later be desorbed by exposure to low pH conditions. <img src='wiley_img_2010/1616301X-2010-20-5-ADFM200901739-content.gif' alt='wiley_img_2010/1616301X-2010-20-5-ADFM200901739-content'> </P>

조선소 블록 적치장의 효율적인 운용을 위한 강화학습 기반 공간 배치 정책

최국철(Choi Guk Cheol),허준환(Huh Jun Hwan),이산하(Lee San Ha),조용진(Jo Yong Jin),김종덕(Kim Jong Deok) 한국통신학회 2023 한국통신학회 인공지능 학술대회 논문집 Vol.2023 No.9

국내 태권도 품새 연구동향 분석

최석환(Choi, Seok-Hwan),김하영(Kim, Ha-Young),김석산(Kim, Suk-San) 한국체육과학회 2021 한국체육과학회지 Vol.30 No.6

This study analyzed Taekwondo Poomsae researches conducted in Korea from December, 1992 to June, 2021 in order to find trends of Taekwondo Poomsae studies. The purpose of this study will provide directions for which studies are needed more in the future. For the purpose of this study, a total of 230 research papers were selected out of 436 papers appeared by entering “Poomsae” as a keyword using the search system of RISS. The results were as follows. First, dividing by period, 4 researches (2%) were conducted in 1992-2001, 40 researches (17%) in 2002-2011, and 186 researches (81%) in 2012-2021. Second, by research field, physiology/prescription (49 researches, 21%), psychology (43 researches, 19%), sociology (37 researches, 16%), philosophy (32 researches, 14%), mechanics (14 researches, 8%), measurement evaluations (13 researches, 6%), and education and management (3 researches, 1%) respectively. Third, by study subjects, athletes accounted for nearly half of the total with 99 (43%), followed by 40 (17%) literature researches, 38 (17%) mixed method studies, 18 (8%) college students/adults, 16 (7%) under elementary school students, 8 (3%) leaders, 6 (3%) middle and high school students, and 1 (0.4%) referee. Fourth, as for the type of research, 143 (62%) quantitative researches accounted for more than half, 83 (36%) qualitative researches, and 4 (2%) mixed method studies.

증례 : 류마티스 ; 분류 불능형 면역 결핍증(Common Variable Immunodeficiency)과 병발된 쇼그렌 증후군 1예

강산하 ( San Ha Kang ),조혜정 ( Hye Jeong Cho ),홍희진 ( Hee Jin Hong ),홍소담 ( So Dam Hong ),김보혜 ( Bo Hye Kim ),정상윤 ( Sang Yoon Jung ),최진정 ( Jin Jung Choi ) 대한내과학회 2015 대한내과학회지 Vol.89 No.2

Common variable immunodeficiency (CVID) is a heterogeneous group of primary immune deficiencies in adults characterized by hypogammaglobulinemia, recurrent bacterial infections, and a higher incidence of autoimmune diseases. More than 25% of CVID patients also have autoimmune diseases such as autoimmune hemolytic anemia, immune thrombocytopenic purpura, rheumatoid arthritis, and systemic lupus erythematosus. However, the pathogenesis of autoimmunity in CVID remains obscure. We report a 56-year-old woman with CVID and Sjogren`s syndrome. In addition to a long history of recurrent upper respiratory infections, acute gastroenteritis, and cellulitis, she has also suffered from persistent xerostomia and xerophthalmia for the past 10 years. Serologic studies revealed hypogammaglobulinemia (low levels of IgG, IgA, and IgM in serum) and the presence of anti-Ro antibodies, and salivary scintigraphy indicated salivary gland involvement. These findings led to a diagnosis of CVID and Sjogren`s syndrome, which was treated by monthly intravenous immunoglobulin therapy. (Korean J Med 2015,89:254-258)

도모도모 : 경춘선 숲길 활성화를 위한 지역 기반의 견주 커뮤니티 서비스

이산하(San Ha Lee),김지현(Ji Hyeon Kim),최연이(Yeon Ee Choi),유은(Eun Yu) 한국디자인학회 2021 한국디자인학회 학술발표대회 논문집 Vol.2021 No.11