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잔류공기조건에 따른 관 내 유동의 압력변화에 관한 실험적 연구
박재곤,이경수,고주석,류시완 한국안전학회 2022 한국안전학회지 Vol.37 No.4
Sudden intrusion of a large amount of surface water into a flood defensive tunnel or pipeline system can compress the residual air. The compressed air may explode along with water through the inlet or air vent, resulting in hydraulic capacity degradation or safety hazards. This study aims to investigate the behavior of compressed air body in pipelines according to the residual air condition with a series of laboratory experiments measuring pressure variation. It has been found that flow characteristics and residual air conditions have a dominant influence on the magnitude and periodicity of the pressure variation. A proper measure to effectively control the residual air is required for securing the design capacity of flood defensive pipeline systems, since the peak pressure is predominantly affected by residual air conditions.
박재곤,강성문,고승철 한국융합보안학회 2018 융합보안 논문지 Vol.18 No.4
최근 하드웨어 키로거는 키보드 내부에 설치할 수 있는 작은 크기와 Wi-Fi 기능을 내장하고 있는 다양한 모듈식 키로거 제품들이 유통되고 있다. 이러한 키로거는 제3자에 의해서 악의적인 목적으로 사용될 경우 탐지가 어려워 정부와 군, 기업과 개인의 중요정보와 민감정보가 유출될 가능성이 높지만, 소프트웨어 키로거와 달리 대응 보안 솔루션과 탐지 방법에 대한 연 구가 미흡한 실정이다. 따라서 본 논문에서는 하드웨어 키로거에 의한 보안 취약점과 기존 연구된 탐지 방법들을 살펴보고 키 보드의 소비전력, 적외선 온도, X-RAY, 무게, 전자파 등의 비파괴 측정 방법을 통해 모듈식 하드웨어 키로거의 탐지 가능성 을 향상 시킬 수 있는 방법을 실험 결과와 함께 제안한다. Hardware Keyloggers are available in a variety of modular keylogger products with small size and Wi-Fi communication capabilities that can be concealed inside the keyboard. Such keyloggers are more likely to leak important information and sensitive information from government, military, business and individuals because they are difficult to detect if they are used by a third party for malicious purposes. However, unlike software keyloggers, research on security solutions and detection methods are relatively small in number. This paper, we investigate security vulnerability caused by hardware keylogger and existing detection methods, and improve the detection possibility of modular hardware keylogger through non-destructive measurement methods, such as power consumption of keyboard, infrared temperature, and X-ray. Furthenmore, We propose a method that can be done with experimental results.
증발산량 관측 대표위치 선정에 관한 연구: 춘천댐 유역을 중심으로
박재곤,김기영,이용준,황보종구,Park, Jaegon,Kim, Kiyoung,Lee, Yongjun,Hwag-Bo, Jong Gu 한국수자원학회 2022 한국수자원학회논문집 Vol.55 No.11
In hydrological surveys, observation through representative location is essential due to temporal and spatial limitations and constraints. Regarding the use of hydrological data and the accuracy of the data, there are still insufficient observatories to be used in a specific watershed. In addition, since there is virtually no standard for the location of the current evapotranspiration, this study proposes a method for determining the location of the evapotranspiration. To determining the location of evapotranspiration, a grid is selected in consideration of the operating range of the Flux Tower using the eddy covariance measurement method, which is mainly used to measure evapotranspiration. The grid of representative location was calculated using the factors affecting evapotranspiration and satellite data of evapotranspiration. The grid of representative location was classified as good, fair, and poor. As a result, the number of good grids calculated was 54. It is judged that the classification of the grid has been achieved regarding topography and land use as a characteristic that appeared in the classification of the grid. In particular, in the case of elevation or city area, there was a large deviation, and the calculated good grid was judged to be a group between the two distributions.
박재곤 한국자료분석학회 2010 Journal of the Korean Data Analysis Society Vol.12 No.3
This paper explores the dynamic information spillover between the stock, foreign exchange, and bond markets in Korea. We employed a Vector Autoregressive Model to analyze return spillover in the mean equation. Multivariate GARCH and GJR models are applied to examine volatility spillover in the variance equation. The correlation between three variables is estimated by the dynamic conditional correlation model of Engle (2002). The information transmission between the stock returns, changes in exchange rates, and changes in bond returns has increased since the 1997 currency crisis. In the mean equation, stock returns and changes in exchange rates affect bond market in the pre-crisis period. On the other hand, stock returns affect the foreign exchange market and the bond market, and changes in exchange rates increase both the stock market and the bond market in the post-crisis period. In the volatility equation, while a shock in the stock market increases the volatility of the bond market before the financial crisis period, a shock in the foreign exchange market increases the volatility of the bond market after the financial crisis period. The correlation between the three variables is significantly time-varying in the post-crisis sample. The information transmission is more active during the crisis period than pre and post crisis period in both returns and volatilities. 본 논문은 우리나라의 주식, 외환, 채권시장간의 동태적 정보전이를 외환위기를 전후로 구분하여 수익률 및 변동성 전이를 중심으로 분석하였다. 수익률 전이는 벡터자기회귀(VAR) 모형으로, 변동성 전이는 다변량 GJR(1,1) 모형을 확장하여 추정하고, 변수간의 상관관계는 Engle(2002)의 동태적 조건부 상관관계(DCC) 모형을 이용하여 분석하였다. 분석 결과는 외환위기를 거치면서 금융시장간에는 정보의 흐름이 증가하고, 연계성이 강화된 것으로 나타났다. 수익률에서는 외환위기 이전에는 주식시장과 외환시장의 정보가 채권시장에, 외환위기 이후에는 주식시장의 정보가 외환시장과 채권시장에 그리고 외환시장의 정보가 주식시장과 채권시장에 유의하게 영향을 미치는 것으로 나타났다. 변동성에서는 외환위기 이전에는 주식시장에서 채권시장으로, 외환위기 이후에는 외환시장에서 채권시장으로 정보가 유의하게 전이되는 것으로 나타났다. 한편 외환위기 기간은 그렇지 않은 기간에 비해 수익률과 변동성에서 정보전이가 더 활발하게 나타났다. 그리고 세 변수들의 상관관계는 외환위기 이전에는 일정한 경우도 있으나, 외환위기 이후에는 유의하게 시변하는 것으로 나타났다.