고등학교 공학교육을 말하다

김범수,Kim, Beom-Su 한국공학교육학회 2019 공학교육동향 Vol.26 No.2

변동량 분석을 이용한 암반대수층의 수리학적 매개변수 산출

김범수,양동철,여인욱,Kim, Bum-Su,Yang, Dong-Chul,Yeo, In-Wook 한국지하수토양환경학회 2010 지하수토양환경 Vol.15 No.6

Derivative analysis, based on the derivative of the drawdown as a function of time (i.e., rate of drawdown change), was applied to the evaluation of hydraulic parameters of the aquifer as an aid of the aquifer test interpretation based on the Theis solutions. Pumping tests were conducted at a coastal fractured aquifer in Muan county, Korea, of which the drawdown data, measured at the two observation wells, were used for derivative analysis. Wellbore storage and transition period were hard to identify at conventional log-log and semi long plots, but was easily recognized by distinctive curves of positive unit slope, hump and negative unit slope in the derivative plot. For the observation well of OW-2 at which wellbore storage and transition lasted over an hour, conventional aquifer analysis would suffer from the uniqueness problems and in further result in erroneous hydraulic parameters. Derivative analysis was found to be effective for distinguishing the drawdown data directly reflecting the aquifer property from those reflecting non aquifer effects such as wellbore storage and transition, which offers a unified methodology to yield correct hydraulic parameters from aquifer test data.

보일러튜브의 수명평가기술

김범수,Kim, Beom-Su 한국열병합발전협회 2000 열병합발전 Vol.17 No.-

당일 입원 환자의 치과 수술 시 Propofol을 이용한 Monitored-Aesthesia Care (MAC)의 안정성 및 유용성에 관한 연구

김범수,김영균,윤필영,이용인,Kim, Bum-Soo,Kim, Young-Kyun,Yun, Pil-Young,Lee, Yong-In 대한치과마취과학회 2007 Journal of Dental Anesthesia and Pain Medicine Vol.7 No.2

Background: Propofol has been used extensively for short-acting intravenous sedative agent during monitored anesthesia care (MAC). This study was designed to evaluate the safety and availability of MAC using propofol in implant surgery of the one-day admission patients. Methods: In this study, subjects were divided into two groups according to ASA physical status. The heart rate, blood pressure, peripheral oxygen saturation and ECG of a patient were estimated under MAC by an anesthesiologist and the vital signs were recorded in recovery room periodically afterwards. The subjective satisfaction with regard to outpatient ambulatory surgery under MAC procedure was evaluated the next day. Results: Systolic and diastolic blood pressure were significantly decreased during MAC in ASA I group, but other remarkable changes in vital sign were not observed. There was no significant difference in pain and anxiety level between ASA I and ASA II, III group. Satisfaction rate was high in both groups. Conclusion: Monitored-Anesthesia Care using propofol during implant surgery of the one-day admission patients might be safe and available procedure because heart rate, blood pressure and oxygen saturation are stable before and during surgery, and adequate control of pain and anxiety is supported.

청어가 살아 있는 이유

김범수,Kim, Beom-Su 한국IT전문가협회 1994 소프트웨어세계 Vol.2 No.-

자연 휴양림 내 건축물의 시각적 영향에 관한 연구 - 조령산자연휴양림을 대상으로 -

김범수,Kim Bum-Soo 한국조경학회 2005 韓國造景學會誌 Vol.33 No.1

The aim of this study was to explain the relationship between the landscape organization and evaluating factors to harmonize the buildings with natural landscape using the landscape simulation models (near view less than $100{\cal}m$) controled the distance and obtain some knowledges about the introduction of buildings into the recreation forest. Through this study, the results were summarized as follow ;1) As the distance got to be near, the evaluation of comprehensive scenery and natural quality became low. 2) At the view points according to the distance the clear landscape organization showed a high value of scenery in comparison with the simple landscape organization, 3) As the coniferous forest showed more high value in comparison with the deciduous forest, the forest type surrounding cottage is important factor evaluating the landscape in the recreation forest area.

자유 시점 TV에서 시점 합성을 위한 시공간적 배경 정보 추정 기반 홀 채움 방식

김범수,응웬 띠엔 닷,홍민철,Kim, Beomsu,Nguyen, Tien-Dat,Hong, Min-cheol 한국전기전자학회 2016 전기전자학회논문지 Vol.20 No.1

본 논문에서는 자유 시점 텔레비전에서 시점 합성 영상 획득을 위해 시공간적 배경 정보 추정 기반 홀 채움 방식을 제안한다. 신뢰할 수 있는 시간적 배경 정보를 획득하기 위해 새로운 배경 코드북의 구성 및 갱신하는 과정을 수행한다. 더불어, 공간적인 국부 배경 정보 추정을 위해 홀 영역의 배경 및 전경 영역의 구별 및 갱신 과정을 수행한다. 추정된 시공간 배경 정보를 조합하여 홀 채움 과정을 수행하고, 잔여 홀 채움을 수행하기 위해 깊이 배경 정보를 이용한 우선순위 함수를 결정하여 표본 기반 인페인팅 기법을 적용한다. 실험 결과를 통해 제안 방식은 기존방식들과 비교하여 평균 0.3~0.6dB의 성능 향상이 있음을 확인하였으며, 동영상 특성 및 홀 형태에 관계없이 제안된 방식이 새로운 시점 영상을 효과적으로 합성할 수 있음을 확인할 수 있었다. This paper presents a hole-filling algorithm based on extrapolating spatial-temporal background information used in view synthesis for free-viewpoint television. A new background codebook is constructed and updated in order to extract reliable temporal background information. In addition, an estimation of spatial local background values is conducted to discriminate an adaptive boundary between the background region and the foreground region as well as to update the information about the hole region. The holes then are filled by combining the spatial background information and the temporal background information. In addition, an exemplar-based inpainting technique is used to fill the rest of holes, in which a priority function using background-depth information is defined to determine the order in which the holes are filled. The experimental results demonstrated that the proposed algorithm outperformed the other comparative methods about average 0.3-0.6 dB, and that it synthesized satisfactory views regardless of video characteristics and type of hole region.

금연법 강화가 흡연에 미치는 영향

김범수,김아람,Kim, Beomsoo,Kim, Ahram 한국개발연구원 2009 韓國 開發 硏究 Vol.31 No.2

국내외적으로 간접흡연이나 환경 속 담배연기가 미칠 수 있는 해악에 대한 관심이 고조되고 있으며, 그 결과 작업공간 내 금연정책이 점차 늘어나고 있다. 한국에서도 작업공간 내 금연정책이 2003년 국민건강증진법 개정으로 훨씬 강화되었다. 본 논문에서는 2001년과 2005년에 이루어진 국민건강영양조사를 이용하여 강화된 금연정책이 흡연율과 일평균 흡연 개비 수에 미친 영향을 분석하고자 한다. 금연법강화가 실내 작업공간 위주로 이루어진 점에 착안하여 법 개정의 영향을 많이 받은 실내근무자 직업군과 영향을 비교적 덜 받는 실외근무자 직업군을 비교하였다. 추정 결과, 금연법 강화로 95% 수준에서 유의하게 흡연율은 4.1%p 감소하였고, 흡연자 중 일평균 흡연 개비는 2.5개비 줄어든 것으로 나타났다. There is a growing concern about potential harmful effect of second-hand or environmental tobacco smoking. As a result, smoking bans in workplace become more prevalent worldwide. In Korea, workplace smoking ban policy become more restrictive in 2003 when National health enhancing law was amended. The new law requires all office buildings larger than 3,000 square meters (multi-purpose buildings larger than 2,000 square meters) should be smoke free. Therefore, a lot of indoor office became non smoking area. Previous studies in other counties often found contradicting answers for the effects of workplace smoking ban on smoking behavior. In addition, there was no study in Korea yet that examines the causal impacts of smoking ban on smoking behavior. The situation in Korea might be different from other countries. Using 2001 and 2005 Korea National Health and Nutrition surveys which are representative for population in Korea we try to examine the impacts of law change on current smoker and cigarettes smoked per day. The amended law impacted the whole country at the same time and there was a declining trend in smoking rate even before the legislation update. So, the challenge here is to tease out the true impact only. We compare indoor working occupations which are constrained by the law change with outdoor working occupations which are less impacted. Since the data has been collected before (2001) and after (2005) the law change for treated (indoor working occupations) and control (outdoor working occupations) groups we will use difference in difference method. We restrict our sample to working age (between 20 and 65) since these are the relevant population by the workplace smoking ban policy. We also restrict the sample to indoor occupations (executive or administrative and administrative support) and outdoor occupations (sales and low skilled worker) after dropping unemployed and someone working for military since it is not clear whether these occupations are treated group or control group. This classification was supported when we examined the answers for workplace smoking ban policy existing only in 2005 survey. Sixty eight percent of indoor occupations reported having an office smoking ban policy compared to forty percent of outdoor occupation answering workplace smoking ban policy. The estimated impacts on current smoker are 4.1 percentage point decline and cigarettes per day show statistically significant decline of 2.5 cigarettes per day. Taking into account consumption of average sixteen cigarettes per day among smokers it is sixteen percent decline in smoking rate which is substantial. We tested robustness using the same sample across two surveys and also using tobit model. Our results are robust against both concerns. It is possible that our measure of treated and control group have measurement error which will lead to attenuation bias. However, we are finding statistically significant impacts which might be a lower bound of the true estimates. The magnitude of our finding is not much different from previous finding of significant impacts. For cigarettes per day previous estimates varied from 1.37 to 3.9 and for current smoker it showed between 1%p and 7.8%p.

족근동 접근법을 이용한 관절 내 종골 골절의 치료

김범수,Kim, Bom Soo 대한족부족관절학회 2013 대한족부족관절학회지 Vol.17 No.4

Open reduction and internal fixation is currently considered as a gold standard of treatment in most of the intra-articular calcaneal fractures. Among various different approaches, extensile lateral approach is the most popular since it provides good exposure to the subtalar joint. However, wide skin incision followed by extensive soft tissue dissection leading to increased risk of wound breakdown is the most serious drawback. Sinus tarsi approach, a minimal invasive technique to approach the subtalar joint and reduce the intra-articular calcaneal fractures, provides good clinical outcome and less wound complications compared to the extensile lateral approach. This article introduces the surgical technique and review of the literature regarding the sinus tarsi approach.

고등학교의 남녀공학 여부가 대입수능에 미치는 영향

김범수,김가영,Kim, Beomsoo,Kim, Ga-young 한국개발연구원 2015 KDI Journal of Economic Policy (KDI JEP) Vol.37 No.-

Park et al.(2012)은 서울의 학군 내 고등학교 무작위 배정정책을 이용하여 특정 학생이 남녀공학에 배정될지 남(여)학교에 배정되는지에 따라 대학수학능력시험에서 학생들의 성적이 어떠한 영향을 받는지를 확인하고자 하였다. 하지만 이 논문은 학군 내 무작위 배정이 아닌 대중교통을 이용하여 30분 이내 학교들 중에서만 무작위 배정이 이루어졌다는 중요한 현실을 고려하고 있지 않으므로 본 논문에서는 각각의 남녀공학과 가장 가까운 남(여)학교 두 곳을 찾아서 이 학교들과의 성적의 차이만을 찾음으로써 보다 정확한 남녀공학과 비교한 남(여)학교의 효과를 측정하고자 하였다. 또한 Park et al.(2012)에서는 한 해 연도의 자료만을 사용하였지만 본 논문에서는 다년도의 자료를 이용하여 결과가 안정적인지도 확인하였다. 이러한 보다 정확한 분석의 결과, 남녀 모두 단성학교가 공학에 비해 통계적으로 유의하게 성적이 향상되는 결과를 보이고 있다. 이 결과를 Park et al.(2012)과 비교하면 여학생의 경우에는 단성학교의 효과가 Park et al.(2012)보다 작고, 남학생의 경우에는 Park et al.(2012)보다 큰 것으로 확인되었다. Park et al. (2012) examined the impacts of coeducation in high school on the college scholastic ability test using random assignment in Seoul high schools. However, the student random assignment in Seoul within a school district was performed only within 30 min commutable areas using public transportation and Park et al. (2012) did not aware of this rule. This paper reexamines the question by matching nearest two single sex schools with a coeducation school within a school district. We found single sex school students achieve higher test score than that of coeducation school for both male and female. The magnitude of test score improvement for female is smaller than that of Park et al. (2012). However, the magnitude for male is bigger than that of Park et al. (2012).