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홍동호(Dongho Hong),유황빈(Hwangbin Ryou) 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.1A
서비스거부공격(DoS)은 공격의 목표가 되는 호스트에 악의적인 패킷을 단지 하나만 보냄으로써 공격이 이루어 질 수 없다. 그렇기 때문에 침입탐지시스템에서는 패킷에 대한 일련의 순차성을 알아냄으로써 연속적으로 패킷을 보내는 DoS 공격으로서의 침입을 탐지해 내는 것이 가능하다. 본 연구에서는 네트워크 패킷에 대한 송신자의 주소와 서비스, 목적지의 주소와 서비스를 이용하여 이벤트를 정의 하였으며, 이렇게 정의된 이벤트를 이용하여 정상적인 상황에서의 이벤트에 대한 순차의존성과 DoS 공격 상황에서의 이벤트에 대한 순차의존성을 알아내었다. 이벤트에 대한 순차의존성을 측정하기 위해서 정상 이벤트가 발생하는 확률을 이용하였으며, 더 나아가서는 정보이론 분야에서의 조건부 엔트로피의 사용도 제안하였다.
중등학교 축구선수의 셀프리더십이 운동몰입 및 운동성과에 미치는 영향
홍동호(Hong, Dong-Ho),정진욱(Jung, Jinuk) 한국체육과학회 2021 한국체육과학회지 Vol.30 No.5
In this study, to investigate the effect of self-leadership of secondary school soccer players on athletic immersion and athletic performance, secondary school enrolled in secondary school enrolled in the secondary school in region A to conduct an empirical study of secondary school soccer players For football players, 250 copies were collected using the convenience sampling method. Among the collected questionnaires, 224 valid samples were obtained, excluding 26 copies of questionnaires that were considered inappropriate as research data, such as missing entries, double entries, and biased entries. For data analysis regression analysis were performed using SPSS version 18.0. The research results are as follows. First. self-leadership according to the personal characteristics of secondary school soccer players showed a significant difference in behavior-oriented (p <.05) depending on the position. Second, self-leadership of secondary school soccer players was found to have a significant effect on cognitive commitment and behavioral commitment, which are sub-factors of exercise commitment. Third, the immersion of secondary school soccer players has a significant effect on athletic performance. Fourth, self-leadership of secondary school soccer players was found to have a significant effect on athletic performance and one of the sub-factors.
권철희,홍동호,이동언,이종순,김영빈,Kwon, Cheol-Hee,Hong, Dong-Ho,Lee, Dong-Yun,Lee, Jong-Soon,Kim, Young-Vin 한국군사과학기술학회 2009 한국군사과학기술학회지 Vol.12 No.6
In this paper, we have proposed the design and implementation for efficient Command Control and Alert(C2A). Information fusion must be done for knowing the state and identification of targets using multi-sensor. The threat priority of targets which are processed and identified by information fusion is calculated by air-defence operation logic. The threat targets are assigned to the valid and effective weapons by nearest neighborhood algorithm. Furthermore, the assignment result allows operators to effectively operate C2A by providing the operators with visualizing symbol color and the assignment pairing color line. We introduce the prototype which is implemented by the proposed design and algorithm.
CDMA 통신망의 하드핸드오프 지원을 위한 적응형 파일럿 비콘에 관한 연구
정기혁,홍동호,홍완표,나극환,Jeong Ki Hyeok,Hong Dong Ho,Hong Wan Pyo,Ra Keuk Hwawn 한국통신학회 2005 韓國通信學會論文誌 Vol.30 No.10A
본 논문에서는 직접대역 확산 통신 기법을 사용하는 이동통신 시스템에서 하향링크상의 무선신호를 이용하여 오버헤드 채널상의 정보를 취득하고 이 정보를 이용하여 파일롯 채널을 생성함으로써 기지국 간 하드핸드오프를 가능하게 하는 적응형 파일롯 비콘 장치를 제안한다. 본 적응형 파일롯 비콘 장치는 무선 신호 중에서 파일롯 채널 만을 선별하여 생성 및 전송하므로 상대적으로 낮은 전력으로 서비스가 가능하며, CDMA 수신부에서 하향링크상의 파일롯 채널로부터 기지국의 시간동기 및 주파수 동기를 획득하여 장치의 오프셋을 보정하므로 GPS에 의한 시간동기가 필요하지 않으며 기지국 순방향 신호의 수신이 가능한 임의의 장소에 설치가 가능한 장점이 있다. CDMA수신기에서 하향링크 파일롯 신호를 탐색하는 파일롯 서처는 FPGA와 DSP를 이용하며, FPGA에서 구현된 파일롯 서처는 초기동기 획득용으로 사용되곤 DSP에서 구현되는 파일롯 서처는 비콘장치의 클럭과 기지국 장치의 클럭사이에 발생하는 오프셋 오차를 보정하는 역할을 수행한다. 적응형 파일롯 비콘 장치의 CDMA 송신부는 CDMA 수신부에서 취득한 파일롯 채널의 시간정보인 타임오프???V을 이용하여, 기지국에 동기된 하향링크 파일롯 신호를 생성한다. FIR필터를 통하여 출력된 1차 중간주파신호는 RF모듈웨서 상향변환된 후 고출력증폭기와 안테나를 통하여 방사하게 된다. This paper proposes an adaptive pilot beacon equipment for mobile communication systems based on direct spread spectrum technology which generates the pilot channel for handoff between base stations by using the information acquired from the downstream wireless signal regarding the overhead channel information. Such an adaptive pilot beacon equipment will enable low power operation since among the wireless signals, only the pilot channel will be generated and transmitted. The pilot channel in the downstream link of the CDMA receiver is used to acquire time and frequency synchronization and this is used to calibrate the offset for the beacon, which implies that time synchronization using GPS is not required and any location where forward receive signal can be received can be used as the installation site. The downstream link pilot signal searching within the CDMA receiver is performed by FPGA and DSP. The FPGA is used to perform the initial synchronization for the pilot searcher and DSP is used to perform the offset correction between beacon clock and base station clock. The CDMA transmitter the adaptive pilot beacon equipment will use the timing offset information in the pilot channel acquired from the CDMA receiver and generate the downstream link pilot signal synchronized to the base station. The intermediate frequency signal is passed through the FIR filter and subsequently upconverted and amplified before being radiated through the antenna.
대남광산 농경지 토양 내 중금속 특성에 따른 물리적 선별 처리효율에 관한 연구
박찬오,홍동호,이재영,이영재,이진수,ParK, Chan Oh,Hong, Dong-Ho,Lee, Jai-Young,Lee, Young Jae,Lee, Jin-Soo 한국지하수토양환경학회 2013 지하수토양환경 Vol.18 No.5
The main objective was to evaluate the efficiencies of different separation techniques, such as gravity separation, magnetic separation, and aerial separation. Zinc and cadmium removal efficiencies by gravity separation and magnetic separation were 28.3~29.3% and 19.1%, respectively, and were higher than the efficiency obtained by aerial separation. Results showed that the combination of gravity separation and magnetic separation in series which was to maximize the removal efficiencies gave removal efficiency of 21.5~38.7% for zinc and 22.1~23.4% for cadmium. The mass of soil meeting the regulation standards for zinc and cadmium after retrieval from the combined separation process accounted for approximately 80% of the treated soil that would be reusable without the pre-treatment procedure as the neutralization process using in the soil washing method. Physical separation techniques utilizing heavy metal properties are the alternative method to remediate heavy-metal contaminated soils in environmental and economic aspects.
장택수,나범철,홍동호,박근국,Jang, Taeksoo,Na, Beomcheol,Hong, Dongho,Park, Keunkuk 한국군사과학기술학회 2020 한국군사과학기술학회지 Vol.23 No.5
When we develop an OpenGL-based coastline map that displays the high resolution data of GSHHG, it takes tens of seconds until the first scene is rendered. That is because it takes time to tessellate polygons with a huge number of vertices. A commonly used solution is that it converts original data to a customized data in advance, and it displays these. But if we should use original data to display a coastline map, we need to find another solution. In this paper we suggest using a polygon splitting technique to minimize tessellation time. In order to prove its effectiveness, we implemented a software applied this technique and measured its performance. The software applied this technique took a few seconds to display the first scene and we confirmed its effectiveness.
수종의 국화과 식물에서 분리한 Sesquiterpene Lactone들의 생리활성(제1보) - 암세포주에 대한 세포독성 -
장대식,박기훈,김환묵,홍동호,전효곤,고영희,양민석,Jang, Dae-Sik,Park, Ki-Hun,Kim, Hwan-Mook,Hong, Dong-Ho,Chun, Hyo-Kon,Kho, Yung-Hee,Yang, Min-Suk 한국생약학회 1998 생약학회지 Vol.29 No.3
A diverse panel of human tumor cell lines and a mouse melanoma cell line (B16-F1) were used for the cytotoxicity test of the nine sesquiterpene lactones with ${\beta}-methylene-{\gamma}-lactone$ group isolated from Hemisteptia lyrata, Chrysanthemum zawadskii and Chrysanthemum boreale. In the cell adhesion inhibitory activity test against B16-F1 mouse melanoma cell, hemistepcin B, cumambrin B, costunolide and tulipinolide were shown significant activities with $IC_{50}$ range of 2.2, 4.1, 0.9 and $0.3\;{\mu}g/ml$, respectively. In the cytotoxicity test against human tumor cells, the most active compound was costunolide having $IC_{50}$ values of below $0.3\;{\mu}g/ml$ against all the tested cell lines except for UACC62. Cumambrin A, hendelin and costunolide exhibited more strong activity against HCT15 and UO-31 cell lines than a positive control, adriamycin. All tested compounds showed an $IC_{50}$ values of below $5.0\;{\mu}g/ml$ against all the tested cell lines.
새로운 관절염 CONP01의 생식독성연구: 랫드 배·태자 발생시험
이정숙(June-Suk Lee),홍동호(Dong Ho Hong),김광호(Kwang-Ho Kim),장호송(Hu-Song Zhang),길기현(Gi Hyun Gil),한명규(Myong Kyu Han),양현주(Hyun Ju Yang),배진숙(Jin-Sook Bae),김남두(Nam Du Kim),송시환(Si Whan Song) 한국독성학회 2005 Toxicological Research Vol.21 No.1
A developmental study of CONP01, a new antiarthritic agent, was conducted in Sprague- Dawley rats. Dosage of CONP01 0, 111, 333, and 1000 mg/kg/day were administered to dams orally from day 6 to day 16 of gestation. Two-third of dams per group were subjected to caesarean section on day day 20 of pregnancy for examination of their fetuses, and the remaining one-third of dams per group were allowed to deliver naturally for postnatal examination of their offspring. There was no change in the dams body weights, food consumptions, specific clinical sings and gross findings. There was significant decrease only in the absolute and relative weights of right ovary in 111 mg/kg treatment group, when compared with the vehicle control, whereas other organ weights were not changed. Moreover, no increase in the frequencies of external, visceral and skeletal malformation of fetuses were observed in the treated groups. These results suggest that the oral NOAEL (no observed adverse effect level) of CONP01 may be over 1,000 mg/kg in dams and fetuses of rats.
게르마늄 복합물 STB-HO-BM의 랫드 및 비글견에서 단회투여 독성연구
송시환(Si Whan Song),정연권(Winston Jung),홍동호(Dong Ho Hong) 한국독성학회 2006 Toxicological Research Vol.22 No.2
The acute toxicity of STB-HO-BM was evaluated in Sprague Dawley (SD) rats and beagle dogs. STB-HO-BM was administered orally to rats at dose levels of 0 and 2,000 ㎎/㎏/day and to dogs at dose levels of 0, 500, 1,000 and 2,000 ㎎/㎏/day. In these experiments, there were no death and clinical changes which were related to STB-HO-BM administration. In addition, there were no significant changes between control and treated groups in body weights and autopsy findings. In conclusion, the administration of STB-HO-BM 2,000 ㎎/㎏ in SD rats and up to 2,000 ㎎/㎏ in beagle dogs was proved to be safe, and it is thought that STB-HO-BM may not show any toxicity in its clinical use.