OCIL기반 보안수준평가를 위한 XML Converter 설계 및 구현

김종민,김상춘,Kim, Jongmin,Kim, Sang-Choon 한국융합보안학회 2020 융합보안 논문지 Vol.20 No.2

사이버안보의 일선에 있는 국가·공공기관 시스템을 대상으로 하는 사이버 공격이 고도화 되면서 꾸준히 증가하고 있다. 이에 국가·공공기관 시스템의 사이버 공격 사고 예방에 대한 보안 평가 기술 개발이 필요하다. 현재 국가·공공기관 정보 시스템의 취약점 분석에 대한 연구는 거의 자동화 분석에 초점을 맞추어 연구되고 있고, 실제로 보안 점검을 수행하다보면 자동화하기 어려운 부분들도 존재한다. 위협에 대한 보안대책만 생각해보더라도 관리적, 물리적, 기술적 분야에서 각기 다른 방안들을 생각하고 실행할 수가 있는데, 이에 대해서는 주관적이든, 상황적이든 간에 특정한 답변들이 제시된다. 이러한 경향들은 OCIL(Open Checklist Interactive Language)로 규격화되어 부분적인 자동화를 이룰 수 있다. 따라서, 본 논문에서는 기존 평가문항을 OCIL기반으로 보안수준평가를 할 수 있게끔 XML Converter를 구현하고자 한다.

Trojan 예측을 위한 ESP 모델 구현

김종민,김민수,김귀남,Kim, JongMin,Kim, MinSu,Kim, Kuinam J. 한국융합보안학회 2014 융합보안 논문지 Vol.14 No.5

A Trojan malicious code is one of largest malicious codes and has been known as a virus that causes damage to a system as itself. However, it has been changed as a type that picks user information out stealthily through a backdoor method, and worms or viruses, which represent a characteristic of the Trojan malicious code, have recently been increased. Although several modeling methods for analyzing the diffusion characteristics of worms have proposed, it allows a macroscopic analysis only and shows limitations in estimating specific viruses and malicious codes. Thus, in this study an ESP model that can estimate future occurrences of Trojan malicious codes using the previous Trojan data is proposed. It is verified that the estimated value obtained using the proposed model is similar to the existing actual frequency in causes of the comparison between the obtained value and the result obtained by the Markov chain.

ADCP를 이용한 직선 하천의 유속 및 수심 측정 정확도 분석

김종민,김동수,손근수,김서준,Kim, Jongmin,Kim, Dongsu,Son, Geunsoo,Kim, Seojun 한국수자원학회 2015 한국수자원학회논문집 Vol.48 No.5

ADCPs have been highlighted so far for measuring steramflow discharge in terms of their high-order of accuracy, relatively low cost and less field operators driven by their easy in-situ operation. While ADCPs become increasingly dominant in hydrometric area, their actual measurement accuracy for velocity and bathymetry measurement has not been sufficiently validated due to the lack of reliable bench-mark data, and subsequently there are still many uncertain aspects for using ADCPs in the field. This research aimed at analyzing inter-comparison results between ADCP measurements with respect to the detailed ADV measurement in a specified field environment. Overall, 184 ADV points were collected for densely designed grids for the given cross-section that has 6 m of width, 1 m of depth, and 0.7 m/s of averaged mean flow velocity. Concurrently, ADCP fixed-points measurements were conducted for each 0.2m and 0.02m of horizontal and vertical spacing respectively. The inter-comparison results indicated that ADCP matched ADV velocity very accurately for 0.4~0.8 of relative depth (y/h), but noticeable deviation occurred between them in near surface and bottom region. For evaluating the capacity of measuring bathymetry of ADCPs, bottom tracking bathymetry based on oblique beams showed better performance than vertical beam approach, and similar results were shown for fixed and moving-boat method as well. Error analysis for velocity and bathymetry measurements of ADCP can be potentially able to be utilized for the more detailed uncertainty analysis of the ADCP discharge measurement.

ADCP 정지법 측정 시 미계측 영역의 유량 산정 정확도 분석

김종민,김서준,손근수,김동수,Kim, Jongmin,Kim, Seojun,Son, Geunsoo,Kim, Dongsu 한국수자원학회 2015 한국수자원학회논문집 Vol.48 No.7

Acoustic Doppler Current Profilers(ADCPs) have capability to concurrently capitalize three-dimensional velocity vector and bathymetry with highly efficient and rapid manner, and thereby enabling ADCPs to document the hydrodynamic and morphologic data in very high spatial and temporal resolution better than other contemporary instruments. However, ADCPs are also limited in terms of the inevitable unmeasured regions near bottom, surface, and edges of a given cross-section. The velocity in those unmeasured regions are usually extrapolated or assumed for calculating flow discharge, which definitely affects the accuracy in the discharge assessment. This study aimed at scrutinizing a conventional extrapolation method(i.e., the 1/6 power law) for estimating the unmeasured regions to figure out the accuracy in ADCP discharge measurements. For the comparative analysis, we collected spatially dense velocity data using ADV as well as stationary ADCP in a real-scale straight river channel, and applied the 1/6 power law for testing its applicability in conjunction with the logarithmic law which is another representative velocity law. As results, the logarithmic law fitted better with actual velocity measurement than the 1/6 power law. In particular, the 1/6 power law showed a tendency to underestimate the velocity in the near surface region and overestimate in the near bottom region. This finding indicated that the 1/6 power law could be unsatisfactory to follow actual flow regime, thus that resulted discharge estimates in both unmeasured top and bottom region can give rise to discharge bias. Therefore, the logarithmic law should be considered as an alternative especially for the stationary ADCP discharge measurement. In addition, it was found that ADCP should be operated in at least more than 0.6 m of water depth in the left and right edges for better estimate edge discharges. In the future, similar comparative analysis might be required for the moving boat ADCP discharge measurement method, which has been more widely used in the field.

센서 기반 모니터링 자료를 활용한 임하댐 저수지 탁수 예측 정확도 개선

김종민,이상웅,권시윤,정세웅,김영도,Kim, Jongmin,Lee, Sang Ung,Kwon, Siyoon,Chung, Se Woong,Kim, Young Do 한국수자원학회 2022 한국수자원학회논문집 Vol.55 No.11

In Korea, about two-thirds of the precipitation is concentrated in the summer season, so the problem of turbidity in the summer flood season varies from year to year. Concentrated rainfall due to abnormal rainfall and extreme weather is on the rise. The inflow of turbidity caused a sudden increase in turbidity in the water, causing a problem of turbidity in the dam reservoir. In particular, in Korea, where rivers and dam reservoirs are used for most of the annual average water consumption, if turbidity problems are prolonged, social and environmental problems such as agriculture, industry, and aquatic ecosystems in downstream areas will occur. In order to cope with such turbidity prediction, research on turbidity modeling is being actively conducted. Flow rate, water temperature, and SS data are required to model turbid water. To this end, the national measurement network measures turbidity by measuring SS in rivers and dam reservoirs, but there is a limitation in that the data resolution is low due to insufficient facilities. However, there is an unmeasured period depending on each dam and weather conditions. As a sensor for measuring turbidity, there are Optical Backscatter Sensor (OBS) and YSI, and a sensor for measuring SS uses equipment such as Laser In-Situ Scattering and Transmissometry (LISST). However, in the case of such a high-tech sensor, there is a limit due to the stability of the equipment. Therefore, there is an unmeasured period through analysis based on the acquired flow rate, water temperature, SS, and turbidity data, so it is necessary to develop a relational expression to calculate the SS used for the input data. In this study, the AEM3D model used in the Water Resources Corporation SURIAN system was used to improve the accuracy of prediction of turbidity through the turbidity-SS relationship developed based on the measurement data near the dam outlet.

초분광영상 기반 탁수 모니터링에서의 탁도-SS 관계식 적용성 검토

김종민,김광수,권시윤,김영도,Kim, Jongmin,Kim, Gwang Soo,Kwon, Siyoon,Kim, Young Do 한국수자원학회 2023 한국수자원학회논문집 Vol.56 No.12

우리나라의 강우 특성은 여름철 홍수기에 집중되어있다. 특히 이상강우 및 기상이변에 의한 집중강우의 증가 추세로 다량의 탁수가 댐 내에 유입될 시 전도현상으로 인해 탁수 장기화 현상이 발생하게 된다. 이러한 문제를 해결하기 위한 탁수 예측을 통한 선제적 조치 방안 또는 댐 운영방안 마련에 많은 연구가 진행되고 있다. 탁수 예측을 위해서는 상류 유입부의 탁수 자료를 필요로 하지만 현재 시·공간적인 데이터 해상도는 부족한 실정이다. 시간적 해상도 개선을 위해서는 탁도-SS 관계식에 대한 개발을 필요로 하며 공간적 해상도 개선을 위해 다항목수질측정기(YSI), 레이저부유사측정기(Laser In-Situ Scattering and Transmissometry, LISST), 초분광 센서 등의 센서 기반 측정을 통해 선, 면 단위 데이터 측정을 통해 탁수에 대한 공간적 해상도를 개선할 수 있다. 또한 LISST-200X의 경우 입경 크기 등에 대한 자료 수집이 가능함에 따라 분율(Clay : Silt : Sand)에 대한 탁도-SS 관계식에 활용될 수 있다. 또한 최근 원격탐사 방안 중 다른 탑재체에 비해 공간해상도 및 시간해상도가 높은 UAV와 분광·방사 해상도가 높은 초분광 센서를 활용 시 탁수 발생에 대한 공간적인 분포를 제시할 수 있다. 따라서, 본 연구에서는 LISST-200X 및 YSI-EXO를 활용하여 실험실 분석을 통해 분율(Clay : Silt : Sand)에 따라 탁도-SS 관계식을 산정하였으며 UAV (Matrice 600), 초분광센서(microHSI 410 SHARK)를 포함한 센서 기반 현장 측정을 통해 탁도와 부유사 농도, 측정된 부유사농도 기반 탁도-SS 관계식을 이용하여 산정한 탁도에 대하여 공간적 분포를 제시하였다. 이를 통해 탁도-SS 관계식에 대한 적용성 검토 및 탁수 발생 현황에 대하여 파악하고자 하였다. Rainfall characteristics in Korea are concentrated during the summer flood season. In particular, when a large amount of turbid water flows into the dam due to the increasing trend of concentrated rainfall due to abnormal rainfall and abnormal weather conditions, prolonged turbid water phenomenon occurs due to the overturning phenomenon. Much research is being conducted on turbid water prediction to solve these problems. To predict turbid water, turbid water data from the upstream inflow is required, but spatial and temporal data resolution is currently insufficient. To improve temporal resolution, the development of the Turbidity-SS conversion equation is necessary, and to improve spatial resolution, multi-item water quality measurement instrument (YSI), Laser In-Situ Scattering and Transmissometry (LISST), and hyperspectral sensors are needed. Sensor-based measurement can improve the spatial resolution of turbid water by measuring line and surface unit data. In addition, in the case of LISST-200X, it is possible to collect data on particle size, etc., so it can be used in the Turbidity-SS conversion equation for fraction (Clay: Silt: Sand). In addition, among recent remote sensing methods, the spatial distribution of turbid water can be presented when using UAVs with higher spatial and temporal resolutions than other payloads and hyperspectral sensors with high spectral and radiometric resolutions. Therefore, in this study, the Turbidity-SS conversion equation was calculated according to the fraction through laboratory analysis using LISST-200X and YSI-EXO, and sensor-based field measurements including UAV (Matrice 600) and hyperspectral sensor (microHSI 410 SHARK) were used. Through this, the spatial distribution of turbidity and suspended sediment concentration, and the turbidity calculated using the Turbidity-SS conversion equation based on the measured suspended sediment concentration, was presented. Through this, we attempted to review the applicability of the Turbidity-SS conversion equation and understand the current status of turbid water occurrence.

초분광영상을 이용한 서낙동강 조류 발생현황 분석에 관한 연구

김종민,권영화,박예림,김동수,권재현,김영도,Kim, Jongmin,Gwon, Yeonghwa,Park, Yelim,Kim, Dongsu,Kwon, Jae Hyun,Kim, Young Do 한국수자원학회 2022 한국수자원학회논문집 Vol.55 No.4

Algae is an indispensable primary producer in the ecosystem by supplying energy to consumers in the aquatic ecosystem, and is largely divided into green algae, blue-green algae, and diatoms. In the case of blue-green algae, the water temperature rises, which occurs in the summer and overgrows, which is the main cause of the algae bloom. Recently, the change in the occurrence time and frequency of the algae bloom is increasing due to climate change. Existing algae survey methods are performed by collecting water and measuring through sensors, and time, cost and manpower are limited. In order to overcome the limitations of these existing monitoring methods, research has been conducted to perform remote monitoring using spectroscopic devices such as multispectral and hyperspectral using satellite image, UAV, etc. In this study, we tried to confirm the possibility of species classification of remote monitoring through laboratory-scale experiments through algal culture and river water collection. In order to acquire hyperspectral images, a hyperspectral sensor capable of analyzing at 400-1000 nm was used. In order to extract the spectral characteristics of the collected river water for classification of algae species, filtration was performed using a GF/C filter to prepare a sample and images were collected. Radiation correction and base removal of the collected images were performed, and spectral information for each sample was extracted and analyzed through the process of extracting spectral information of algae to identify and compare and analyze the spectral characteristics of algae, and remote sensing based on hyperspectral images in rivers and lakes. We tried to review the applicability of monitoring.

간접방류사업장 관련 폐수의 생태독성수준 및 특성 평가

김종민,신기식,이수형,이정서,이택준,Kim, Jongmin,Shin, Kisik,Lee, Soohyung,Lee, Jungseo,Lee, Taekjune 한국물환경학회 2017 한국물환경학회지 Vol.33 No.4

This paper aims to evaluate the characteristics of direct and indirect effluents'toxicity level and difference between two test durations (24 h and 48 h) of test method. The proportion of the indirect effluent samples which exceeded the ecotoxicity permit limitations (TU 1 or TU 2) showed more than 2 times higher than that of direct effluent samples. However, effluent toxicity of Wastewater Treatment Plants (WTPs) indicated less than TU 1 regardless of influent toxicity. From this results, treatment process was thought to have a good efficiency. WTP Salinity was very similar between influent and effluent. This trend could be reconfirmed by the component ratio of ion concentration between them and $Na^+$, $SO_4^{2-}$, $C^-$ lions which have a greater percentage than other ions. In addition, in case of high salinity, toxicity value also showed high level. To judge from above results, indirect effluents which were exempted from application of ecotoxicity standards, may need a new effluent limitations regardless of the treatment efficiency of WTP. According to circumstances, effective countermeasure may need to restrain the discharge of salinity-contained effluents which came from indirect-effluent factories. Test duration comparative study indicated that 48 h results were higher toxicity (exceeding rate of ecotoxicity criteria) than 24 h by the 5 to 5.4 percentage. 24 h test duration seemed to be useful in case of rapid detection, whereas 48 h test method could be applied for reinforcement of ecotoxicity regulatory system.

엘라스틱 스택에 기반한 실시간 웹서비스 관제 시스템의 설계와 구현

김종민(Jongmin Kim),김채윤(Chae Yoon Kim),김호준(HoJun Kim),Khin Chan Myae Aung,손미정(Mijeong Son),김영옥(YoungOk Kim),권오흠(Oh-Heum Kwon),송하주(Ha-Joo Song) 한국정보과학회 2018 한국정보과학회 학술발표논문집 Vol.2018 No.6

멀티미디어 MAC 프로토콜의 구비요건 분석

김종민(Jongmin Kim),이정태(Jungtae Lee) 한국정보과학회 1991 한국정보과학회 학술발표논문집 Vol.18 No.2

본 논문에서는 멀티미디어 MAC 프로토콜이 갖추어야 할 구비요건을 제시하고, 현재 연구되고 있는 MAC 프로토콜이 이들 구비요건을 만족하고 있는지를 검토하였다. 기존의 멀티미디어 MAC 프로토콜은 우선순위를 구분하여 특정 등급의 트래픽에 대해서는 지연시간을 일정치 이하로 보장하여야 한다. 또 BISDN과 호환성이 있어야 하고, 신뢰성과 효율이 높아야 한다. 기존의 MAC 프로토콜 중에서 DODB, ATMR, Orwell Ring 프로토콜이 이러한 구비요건을 만족하고 있다.