[기획보도 부문_제129회 이달의 방송기자상] 비자 정책의 허점 파고든 ‘검은 커넥션’ : 〈베트남 한국 비자 불법 발급 실태 연속보도〉 2019년 6월 10일~11일, 25일 보도_SBS · SBS A&T 강민우, 김용우 기자

강민우 (사)방송기자연합회 2019 방송기자 Vol.50 No.-

MAC Frame Aggregation이 가능한 에드혹 네트워크에서의 Congestion Window Limit을 통한 TCP 성능의 최적화

강민우,박희민,박준상 한국ITS학회 2010 한국ITS학회논문지 Vol.9 No.4

무선 애드혹 네트워크에서 MAC layer의 효율을 높이기 위한 하나의 방법으로서 사용되는 MAC frame aggregation은 MAC layer에서 여러 개의 MPDU (MAC protocol data units)를 하나의 PPDU (PHY protocol data units)로 aggregation 시켜서 성능을 향상시키는 방법이다. 애드혹 네트워크에서 TCP 성능 향상을 위해서 사용되는 방법의 하나로서 CWL (congestion window limit)의 설정 방법이 있는데 이는 congestion window의 상한을 두어 부적절한 congestion window 크기가 선택에 따른 영향을 최소화 하고자 하는 방법이다. 본 논문에서는 MAC frame aggregation이 가능한 MANET에서 최적화된 TCP 성능을 위하여 CWL를 조정하는 방법에 대하여 다룬다. MAC frame aggregation is a method that combines multiple MPDUs (MAC protocol data units) into one PPDU (PHY protocol data units) to enhance network performance at the MAC layer. In ad hoc networks, TCP underperforms due to the congestion window overshooting problem and thus by setting CWL (congestion window limit) TCP performance can be improved. In this paper, we investigate the problem of setting CWL for TCP performance optimization in ad hoc networks with MAC frame aggregation.

논토양 내 비소 불용화에 대한 안정화물질의 처리 효과

강민우,오세진,김성철,이상수 한국환경농학회 2019 한국환경농학회지 Vol.38 No.1

BACKGROUND: Soil contamination of As is a very sensitive environmental issue due to its adverse impact on human health and different characteristics with other heavy metals. With public awareness of As poisoning, there has been growing interest in developing guideline and remediation technologies for As-contaminated soil. The objective of this research was to evaluate the effectiveness of stabilizing amendments and soil dressing methods on the mobility of As in the contaminated rice paddy soils nearby mining area. METHODS AND RESULTS: Different amendments were mixed with surface and subsurface contaminated soils at a ratio of 3% (w/w) and monitored for five months. Three different extractants including 0.01M CaCl2, TCLP, and PBET were used to examine As bioavailability in the soil and the concentration of As in rice grain was also measured with an inductively coupled plasma (ICP) spectroscopy. The results showed that all amendment treatments decreased As concentration compared to the control. Especially, coal mine drainage sludge (CMDS) treatment showed the highest efficiency of decreasing As concentration in the soil and rice grain. The values of Pearson correlation (r) between As concentrations in the soil and rice grain were 0.782, 0.753, and 0.678 for CaCl2, TCLP, and PBET methods, respectively. Especially, CaCl2 method was highly correlated between As concentrations of the soil and soil solution (r=0.719), followed by TCLP (r=0.706), PBET (r=0.561) methods. CONCLUSION: Stabilizing amendments can effectively reduce available As concentration in the soils as well as soil solution, and thereby potentially mitigating risks of crop contamination by As.

한국경제의 과잉유동성 논란과 금융위기 이후 정책대응 평가

강민우 경희대학교 사회과학연구원 2009 社會科學硏究 Vol.35 No.3

This study evaluates the consequences of monetary easing policy actions which the Bank of Korea has taken since the late 2008 and examines the existence of excess liquidity in the Korean economy with employing McCallum’s rule. The rule is very useful in that it explicitly considers the trends in money velocity and the deviation of actual growth from potential one and thus estimates the volume of liquidity that is adequate to meet the economic transaction needs more accurately than focusing solely on monetary aggregates indicators in isolation. Monetary policy actions by the Bank of Korea have been relatively adequate and significantly contributed to the alleviation of credit conditions in the capital market. Moreover, the finding related to the liquidity situation is that there does not exist excess liquidity but rather the shortage of around 0.3 trillion won in terms of monetary base in the Korean economy in the second quarter of 2009. Therefore, the assertion that the preemptive transition to contractionary monetary policy is necessary to avoid the asset bubbles and high inflation risk in advance seems to be premature yet and the monetary authority needs to maintain the present policy stance till positive signals that economic uncertainties have cleared emerge. 본 연구는 금융위기 이후 정부 차원에서 전개해 온 유동성지원 정책의 적절성을 평가함과 동시에 2009년 3월 이후 논란의 중심에 있는 과잉유동성의 실재여부를 2002년 이후 현재까지 (2002.1~2009.2) 분기별 데이터를 이용해 맥컬럼 준칙(McCallum’ rule)으로부터 확인하고 그 규모를 추정하였다. ‘맥컬럼 준칙’은 분석대상 경제가 현재 처한 경기국면과 통화유통속도 등을 명시적으로 고려해 해당 경제활동 수준에 부합되는 적정 유동성 규모를 판단하는 데 유용하다는 점에서 채택되었다. 분석 결과 韓銀의 통화완화 정책대응은 국면별로 비교적 적절했으며 자금시장 경색완화에 기여한 것으로 나타났다. 또한, 대규모 유동성 공급 확대에도 2009년 2분기 현재 본원통화 기준으로 측정한 유동성규모는 적정 수준인 것으로 나타나 -정확하게는 약 0.3조원이 부족한- 현 시점에서 과잉 유동성 논란은 다소 시기상조이며, 일각에서 제기되는 신속하고 선제적인 유동성 환수의 필요성에 대한 주장은 보다 신중히 접근해야 할 것으로 분석되었다. 중기적으로 경기회복이 본격화되고 자금시장 흐름이 정상화되는 시점에는 자산버블화 혹은 인플레이션 리스크가 확대될 것이나 당분간 현 통화완화정책 기조는 유지될 필요가 있으며 정책 당국은 유동성 환수보다는 풀린 유동성의 산업자금화를 도모하는 방안을 모색하는 것이 바람직한 것으로 판단되었다.

외부 전동블라인드의 사양에 따른 창호 차음성능 개선 효과

강민우,이희동,오양기 한국음향학회 2022 韓國音響學會誌 Vol.41 No.6

The most realistic way to reduce noise outside the building, such as road traffic noise and aircraft noise, is to strengthen the sound insulation performance at the sound collecting points such as balconies, windows, and exterior walls of each building. However, in light of the reality that shading devices outside buildings are not yet widely used, there are not many studies on sound insulation performance improvement using external windows and window devices such as louvers and blinds. In particular, external blinds can not only block the inflow of strong sunlight in the morning and evening from the outside of the building, but also target the sound insulation effect that blocks the peak noise that occurs during commuting hours. In this study, a study was conducted to improve sound insulation performance against external noise by using an external electric blind (EEB), which is one of the most efficient window and door external shading devices. Various sound insulation performance tests were conducted while changing the configuration of external electric blinds developed for light blocking purposes. Through this, it was verified that an additional sound insulation performance of 6 dB can be obtained by installing an external electric blind compared to the reduction performance of general windows. 도로교통 소음이나 항공기 소음 등의 건물 외부소음을 저감하기 위한 가장 현실적인 방안은 각 건물의 발코니와 창호, 외벽 등 수음점에서의 차음성능을 강화하는 것이다. 그러나 아직 건물 외부의 차양장치가 광범위하게 사용되지 않고 있는 현실에 비추어 루버나 블라인드 등의 창호 외부장치를 활용하는 차음성능 개선 연구는 많지 않다. 특히 외장형 블라인드는 아침-저녁의 강한 일사의 유입을 건물 외부에서 차단하는 차광 효과 뿐 아니라 출퇴근 시간대에 발생하는 피크 소음을 차단하는 차음 효과도 동시에 목표할 수 있다. 이 연구에서는 가장 효율적인 창호 외부 차양장치의 하나인 외부 전동블라인드(External Electric Blind, EEB)를 활용하여 외부소음에 대한 차음성능을 개선하고자 하는 연구를 수행하였다. 차광 용도로 개발된 외부 전동블라인드의 구성을 변화시켜가면서 다양한 차음성능 실험을 수행하였다. 이를 통해 일반 창호의 저감 성능 대비 외부 전동블라인드를 설치함으로써 6 dB의 추가 차음성능을 얻을 수 있음을 검증하였다.

[취재후기] “정직하면 돈 못 번다?” 극우 유튜버들의 슈퍼챗을 파헤치다

강민우 (사)방송기자연합회 2021 방송기자상 수상집 Vol.- No.-

[수습은 어떻게 기자가 되나_SBS] 그리고 1년… 그렇게 기자가 되었다

강민우 (사)방송기자연합회 2018 방송기자 Vol.44 No.-

진동측정을 통한 공동주택 엘리베이터 소음 레벨 평가

강민우,송민정,오양기 한국건축친환경설비학회 2018 한국건축친환경설비학회 논문집 Vol.12 No.6

Elevator noise in apartment houses is one of the factors which prevent the residents from quiet and comfortable life. The elevator noise measurement method [KS F ISO 16032] is introduced from the matching ISO standard, however, it has problems in the application to the actual measurement. To visualize the problems, measurements in an apartment house are conducted, which has been suffering from the elevator noise for a long time. The measurement itself is extremely difficult due to the low sound pressure level of elevator, which is lower than 35 dB (A), and the even higher background noise level. However the vibration levels measured at the same time are relatively less disturbing As a result of vibration measurement, it was found that the vibration is clearly measured on the wall, and presents a high correlation coefficient of over 0.8 with the noise levels measured This shows that the vibration level measured on the elevator walls may be rather reliable numbers than the elevator noise levels in the actual noisy condition of elevator halls and the vicinity.

Neurological outcomes and survival rate of out-of-hospital cardiac arrest patients with return of spontaneous circulation after percutaneous coronary intervention across age groups: a cross-sectional study

강민우,이준희,박정호 대한응급의학회 2020 大韓應急醫學會誌 Vol.31 No.1

Objective: Little is known about percutaneous coronary intervention (PCI) and its benefits in elderly patients with out-ofhospital cardiac arrest (OHCA). This study compared the survival to discharge and the neurological outcomes across the age groups of patients with OHCA. Methods: Using the national cardiac arrest registry, OHCA patients with a return of spontaneous circulation from 2013 to 2017 were included in this study. The PCI history of the patients was obtained from their medical records. The outcomes were cerebral performance category (CPC) 1 and 2 and survival to discharge. Multivariable logistic regression analysis was performed, and an interaction term was evaluated to compare the effects of PCI across the age groups. Results: This study included 22,320 patients. In the interaction term, the adjusted odds ratio (AOR) (95% confidence interval [CI]) for a good CPC was 2.84 (2.43-3.32) for the age group of 18-64 years, 3.26 (2.53-4.21) for the age group of 65-74 years, 3.37 (2.33-4.88) for the age group of 75-84 years, and 2.54 (0.92-7.01) for the age group of 85-106 years. The AOR (95% CI) for survival to hospital discharge was 3.31 (2.82-3.88) for the age group of 18-64 years, 2.65 (2.09- 3.35) for the age group of 65-74 years, 2.20 (1.61-3.02) for the age group of 75-84 years, and 1.64 (0.73-3.67) for the age group of 85-106 years. Conclusion: In the OHCA patients, the PCI group had more good outcomes (good CPC, survival to discharge) than the non-PCI group, but this benefit was not shown in those aged over 85 years. On the other hand, it could not explain why PCI should not be performed in the elderly, suggesting that age alone should not be used to make decisions regarding early invasive strategies.

가속수명시험을 이용한 쇼트피닝가공 알루미늄 합금의 신뢰성평가에 관한 연구

강민우,정성균,남지헌 대한기계학회 2006 大韓機械學會論文集A Vol.30 No.12