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유재현(Yu JaeHyun),박장용(Park JangYong),송재승(Song JaeSeung) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.2
망분리는 네트워크 보안기법의 일종으로써 외부의 공격으로부터 내부의 자료를 보호하기 위해 망을 분리하는 것을 의미한다. 인터넷의 발달로 빈번히 발생하고 있는 해킹 및 악성프로그램과 같은 사이버 공격으로부터 중요 정보를 보호하기 위해 망분리 기술이 사회 곳곳에서 사용되어 지고 있다. 본 논문은 최근 증가하고 있는 망분리 환경에서의 해킹기법인 Air Gap 공격에 대해 다루고 있다. 다양한 기술들이 Air Gap 공격에 접목됨으로 인해 안전한 영역은 사라지고 있다. 본 논문에서는 최근까지 이루어진 다양한 Air Gap 공격들에 대해 알아보고, 향후 Air Gap 공격을 막기 위해 필요한 연구에 대해 논한다.
통합수질지수 및 오염부하자료를 이용한 공릉천 유입지천과 본류의 오염특성 분석
유재현 ( Jae-hyun Yu ),이한샘 ( Han-saem Lee ),임병란 ( Byung-ran Lim ),강주형 ( Joo-hyoung Kang ),안태웅 ( Tae-ung Ahn ),신현상 ( Hyun-sang Shin ) 한국물환경학회(구 한국수질보전학회) 2020 한국물환경학회지 Vol.36 No.2
In this study, we identified the major pollution-zones of the mainstream and its tributaries of Gongneung stream and investigated their pollution sources based on water quality, flowrate and pollution-load data of the stream having the characteristics of the urban-rural complex to examine the effect of the tributaries on the water quality changes in the mainstream. The water quality and flowrate data were collected for 10 months (2018 ~ 2019) at 3 points of mainstream and ten tributaries. Water quality index (WQI), load duration curve (LDC), discharge load density (DLD)and delivery ratios for each tributary were obtained so as to investigate the pollution characteristics and some of the information visualized on GIS. The main pollution-zone in the Gongneung stream was in the middle and lower streams, and the tributaries that may affect the pollution of the area were JS, JY, SL and SM. JS and SL had low WQI levels (34.7/37.5) and DLD (kg/d/km<sup>2</sup>) of BOD and T-P were relatively high in JY (99.2/6.00) and SL (60.0/2.07). BOD and T-P delivery ratios in JS were high (0.94/0.83), suggesting that JS had significant influence on the water quality of the main pollution-zone in the Gongneung stream. Meanwhile, SM having a high T-P delivery ratio (0.97) was found to be more affected by the non-point source due to the higher LDC excess rate (%) in the low flow compared to high flow. This study provides basic data on the water quality and pollution characteristics of the Gongneung stream, and the analysis results are expected to be used as examples for identifying the main pollution-zone and tributaries of stream and their pollution sources.