장기 가뭄기간의 유출량을 고려한 SWAT 보정 매개변수 추정 연구

김다래,김성준,Kim, Da Rae,Kim, Seong Joon 한국농공학회 2017 한국농공학회논문집 Vol.59 No.2

Recently, the hydrological model Soil Water Assessment Tool (SWAT) has been applied in many watersheds in South Korea. This study estimated parameters in SWAT for calibrating streamflow in long-term drought periods. Therefore, we focused on the continuous severe drought periods 2014~2015, and understand the model calibrated parameters. The SWAT was applied to a $366.5km^2$ Gongdo watershed by using 14 years (2002~2015) daily observed streamflow (Q) including two years extreme drought period of 2014~2015. The 9 parameters of CN2, CANMX, ESCO, SOL_K, SLSOIL, LAT_TIME, GW_DELAY, GWQMN, ALPHA_BF were selected for model calibration. The SWAT result by focusing on 5 normal years (2002~2006) calibration showed the 14 years average Nash-Sutcliffe model efficiency (NSE) for Q and 1/Q with 0.78 and 0.58 respectively. On the other hand, the 14 years average NSEs of Q and 1/Q by focusing on 2 drought years (2014~2015) calibration were 0.86 and 0.76 respectively. Thus, we could infer that the SWAT calibration trial by focusing on drought periods data can be a good approach to calibrate both high flow and low flow by controlling the 9 drought affected parameters.

문제중심학습(PBL)기반 유아과학교육이 예비유아교사의 자기 주도적 학습능력, 학업적 자기효능감 및 학습동기에 미치는 영향

김다래(Da Rae Kim) 한국홀리스틱융합교육학회 2022 홀리스틱융합교육연구 Vol.26 No.4

이 연구는 문제중심학습(PBL)기반 유아과학교육이 예비유아교사의 자기 주도적 학습능력, 학업적 자기 효능감 및 학습동기에 미치는 영향을 알아보고자 한다. 이를 위해 K지역의 C대학교 유아교육학과에 개설된 PBL기반 유아과학교육 교과목을 수강한 예비유아교사 38명을 대상으로 자기 주도적 학습능력, 학업적 자기효능감, 학습동기에 대한 사전, 사후 조사를 실시하여 PBL 수업의 효과성을 분석하였다. 수집된 자료는 연구문제에 따라 PBL기반 유아과학교육이 자기 주도적 학습능력, 학업적 자기 효능감, 학습동기에 미치는 영향을 알아보기 위해 SPSS/ PC(win 17.0) 프로그램을 사용하여 대응표본 t검증을 실시하였다. 연구결과 PBL기반 유아과학교육이 예비유아교사의 자기 주도적 학습능력, 학업적 자기 효능감, 학습동기 모두에서 통계적으로 유의한 증가를 나타내어 PBL기반 유아과학교육의 긍정적 효과성이 검증되었다. 이러한 결과는 예비유아교사의 역량강화를 위한 교수학습방법으로 교원양성교육 현장에서 활용될 수 있는 방안을 모색하는데 기초자료로 활용될 수 있을 것이다. This purpose of this study is to investigate the effects of problem-based learning (PBL) classes on self-directed learning ability, academic self-efficacy, and learning motivation in prospective early childhood teachers. To this end, the effectiveness of PBL classes was analyzed by conducting pre- and post-experimental surveys on self-directed learning ability, academic self-efficacy, and learning motivation, involving 38 preliminary early childhood teachers who took a PBL-based early childhood science education course in the department of early childhood education at C University in the K region. To understand the effects of PBL classes on their self-directed learning ability, academic self-efficacy, and learning motivation according to the research questions, a paired t-test on the collected data were performed using the SPSS/PC (Windows 17.0) program. As a result of the study, the positive effectiveness of PBL classes was confirmed with statistically significant increases in all variables of self-directed learning ability, academic self-efficacy, and learning motivation in prospective early childhood teachers. These results can be used as basic data to find a way to be used in the field of teacher training as a teaching-learning method for strengthening the competence of pre-service early childhood teachers.

무증자 발아흑미를 이용한 막걸리 제조 시 온도가 미치는 영향

김다래(Da-Rae Kim),서보미(Bo-Mi Seo),노민희(Min-Hee Noh),김영완(Young-Wan Kim) 한국생물공학회 2012 KSBB Journal Vol.27 No.4

In this study we investigated the effect of temperature on the two-stage fermentation of Makgeolli using uncooked germinated black rice. The fermentation processes were conducted at 15℃ for three weeks and 25℃ for 7 days. The pH of Makgeolli at 25℃ increased from pH3.0 to pH 4.2, which was consistent with that at 15℃. In contrast total acidity of Makgeolli at 15℃ was about half of that at 25℃ (0.36% and 0.59%, respectively). By the 7 days-fermentation at 25℃, 11% of alcohol was produced, whereas three weeks were required for the same alcohol production at 15℃. In the case of sugar contents, the amounts of total glucose-equivalent reducing sugars and glucose increased at the end of the fermentation at 25℃ up to 2.25 mg/mL and 3.4 mM, respectively, whereas those at 15℃ were maintained at very low levels (0.18 mg/mL and 0.1 mM, respectively). Such limited supplement of sugars at 15℃ seemed to affect metabolism of yeast, resulting in different composition of organic acid. At 25℃, citric acid that was 73.4 ppm at the initial fermentation was consumed completely, whereas 20 ppm of citiric acid was remained at 15℃. In addition, acetic acid and lactic acid in Makgealli at 15℃ were 53% and 14% of those at 25℃.

경량화 철도 방음시설 설치에 따른 소음저감 효과 연구

김다래(Da Rae Kim),김태민(Tae Min Kim),김정태(Jeung Tae Kim),손정곤(Jung Gon Son),류래언(Le On Ryu) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10

철도 소음은 철도 변 주거지역에 심각한 소음피해를 발생하게 된다. 따라서 주변지역으로 전달되는 소음 전파를 감소시키기 위해 방음벽 또는 방음터널을 설치하여 소음전파 현상을 차단하고자 한다. 그래서 기술 발전에 따른 철도 차량의 고속화, 공동주택의 고층화 등으로 인하여 기존 방음시설 적용 가능 여부 및 재료 선정에 대한 연구가 요구된다. 특히 교량 위의 철로 변의 경우, 일반 지반의 철도 변보다 교량 진동에 의한 소음이 상대적으로 크게 발생되며 방음 시설 설치에 따른 많은 경제적 비용이 요구되기 때문에 방음시설의 효과에 알아 볼 필요가 있다. 본 연구에서는 광음향 기법을 이용하여 교량 위방음 시설의 종류 및 재질에 따른 소음 저감 효과를 분석하였다. 그 결과, 방음벽보다 방음 터널 설치 시 공동주택 고층부 소음 저감 효과를 보였으며, 기존 방음 터널 대비 경량화된 루버를 사용했을 때 철도 소음을 전반적으로 3 ~ 8 dB 저감해주는 것으로 나타났다. Railway noise takes place in critical noise damages to residential area around railway. In order to reduce noise propagation transferred into the surrounding area, we attempt to block noise propagation establishing soundproof walls or soundproof tunnel. So caused by high speed railroad car and high-rise apartment with development of railway technology, it is demanded study on whether it is able to apply to existing sound proof facilities and selection of materials. In a case of railroad on bridge, especially, it comes about relatively louder noises than ones of railroad on ordinary ground. And it is demanded lots of economic cost by establishing sound proof facilities. That’s why we studied that is the way on noise propagation with sound proof wall or sound proof tunnel around railroad. As result, establishing sound proof tunnel is more effective on noise reduction of high floors than sound proof walls, and in a case about using louver which is lightening than existing sound proof tunnel, it is reduced by 3 ~ 8 dB at the whole floors.

미래 기후변화와 토지이용변화가 안성천유역 수문에 미치는 영향 평가

김다래 ( Da Rae Kim ),이지완 ( Ji Wan Lee ),정충길 ( Chung Gil Jung ),김성준 ( Seong Joon Kim ) 한국농공학회 2017 한국농공학회 학술대회초록집 Vol.2017 No.-

본 연구의 목적은 안성천 상류 공도유역(366.5㎢)을 대상으로 SWAT모형을 이용하여 미래기후변화와 토지이용 변화가 수문학적 거동에 미치는 영향을 분석하고자 하였다. 미래기후변화 시나리오는 기상청에서 제공하는 HadGEM3-RA의 RCP4.5와 8.5를 이용하여 2030s (2020-2039)과 2050s (2040-2059) 기간으로 나누어 적용하였으며, 토지이용변화는 도시성장 시나리오에 따른 회귀모형 기반의 CLUE-s모델을 사용하였다. HadGEM3-RA의 2050s은 기준년 (1976-2005) 대비 RCP 4.5에서 기온 및 강수량이 2.4℃ 및 18.5%증가하였고, RCP 8.5에서 2.6℃ 및 6.5%증가하는 것으로 나타났다. 토지이용변화 예측결과 2050년에는 도시지역 및 산림 면적이 58.6% (29.0 ~ 46.0㎢) 및 4.1%(171.0 ~ 178.0㎢)으로 각각 증가하였고, 농경지 면적이 24.7% (89.0 ~ 67.0㎢)으로 감소하는 것으로 예측되었다. SWAT 수문 검보정은 유역출구의 공도관측소 일 유량자료를 이용하였으며, 모형의 보정은 유량(Q)과 1/Q을 대상으로, 고유량과 저유량에 대한 Nash-Sutcliffe 모델효율(NSE)을 목표로 하였다. 2014~2015년 2년 연속가뭄년을 대상으로 검보정한 결과, Q와 1/Q의 NSE는 각각 0.86과 0.76였다. 기준년(1975-2005) 대비 기후변화에 따른 미래 RCP 4.5 2050s의 증발산량, 지표, 중간 및 총유출은 최대 23.1%, 22.4%, 14.8% 및 10.9%로 증가했고, 토양수분과 기저유출은 23.0% 및 6.6%로 감소하였다. 한편, 미래 토지이용변화를 고려한 기후변화 영향 평가결과 기준년 대비 증발산량, 토양수분량, 지표, 중간 및 총유출이 각각 24.1%, 2.1%, 111.9%, 24.1% 그리고 19.5%로 증가하였고, 기저유출은 49.7% 감소하는 것으로 나타났다. 본 연구결과는 미래 기후변화에 따른 유역의 수문평가 시 미래의 토지이용변화가 적지 않게 영향을 준다는 것을 보여주고 있다.

공공시설의 복합화를 통한 학교이전적지 재생 방안에 관한 계획연구

김다래(Kim Da-Rae),김일현(Kim IlHyun) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(계획계)

One of the most important issue in the contemporary city regard urban renewal and architectural renovation. This study aims on focus on the phenomenon of facility relocation specifically on Sudo girls’ high school in Yongsan district, Through critical study on the current masterplan. This study intends to propose an alternative urban development of public facilities, preserving historically important building within complex public facilities.

수학적 표상을 활용한 유아과학교육 프로그램 개발 및 효과

김다래 ( Kim Da Rae ),정미라 ( Chung Mi Ra ) 한국유아교육학회 2018 유아교육연구 Vol.38 No.5

본 연구의 목적은 수학적 표상을 활용한 유아과학교육 프로그램을 개발하고, 개발한 프로그램의 유아교육 현장 적용 타당성을 검증하는 데 있다. 프로그램 개발은 선행연구 및 문헌분석을 바탕으로 현장관찰과 교사 심층 면담을 통해 교육현장 실태 및 요구를 조사하여 1차 시안을 구성하였고, 교육현장에 시범 적용한 후 최종 전문가 협의 과정을 거쳐 수학적 표상을 활용한 유아 과학교육 프로그램을 최종 완성하였다. 수학적 표상을 활용한 유아과학교육 프로그램의 체계는 목적 및 목표, 교육내용, 교수-학습 방법 및 평가로 구성하였다. 개발한 프로그램의 교육현장 적용타당성 검증을 위해 만 4세와 만 5세 학급의 유아 86명을 연구대상으로 선정하였다. 실험집단은 ‘수학적 표상을 활용한 유아과학교육 프로그램’을, 비교집단은 ‘생활주제에 따른 실험 중심 과학활동 프로그램’을 적용하여 13주간의 실험처치를 실시한 후, 유아의 과학적 탐구능력, 과학적 태도, 수학능력에 미치는 효과를 분석하였다. 연구결과 본 연구에서 개발한 프로그램이 유아의 과학적 탐구능력, 과학적 태도, 수학능력 증진에 긍정적인 효과가 있는 것으로 나타났다. 이는 수학적 표상을 활용한 유아 과학교육 프로그램이 교육현장에 적용 가능함을 시사한다. The purpose of this study is to develop a science education program for young children using mathematical representation, and to verify the validity of the application of the developed program to early childhood education fields. To develop the program, based on the prior research analysis, the first draft proposal was formed by investigating the field conditions and teacher’s perceptions through field observations and teacher interviews. Afterwards, the first draft proposal was applied to education sites, and then the program was established with educational objectives and goals, educational contents, teaching-learning methods, and evaluation systems. In order to validate the application of this program to educational fields, 85 children from two classes for four-years-olds and five-years-olds were selected for an experimental study. The experimental group was treated with the science education program for young children using mathematical representation that was developed from this study, and the comparison group was provided with a large and small group discussion science education program for young children using mathematical representation. The experimental treatments were conducted for 13 weeks to verify the effects of the education field applications in this program. The children’s scientific process skill, scientific attitudes, mathematical ability were tested, The findings revealed that ‘the science education program for young children using mathematical representation’ exerts positive effects to promote children’s scientific process skill, scientific attitudes, mathematical ability. The results demonstrated that this program is applicable to the education field.

증례 : 순환기 ; 신동맥에 접한 복부대동맥류에서 굴뚝형 이식편을 이용한 혈관내 치료

김다래 ( Da Rae Kim ),고영국 ( Young Guk Ko ),이도연 ( Do Yun Lee ),최동훈 ( Dong Hoon Choi ) 대한내과학회 2014 대한내과학회지 Vol.86 No.2

An endovascular repair of an abdominal aortic aneurysm (AAA) is technically less invasive than open surgery, but gives results as effective as open surgery if the anatomy is adequate. Unfortunately, 20-30% of AAA patients are not suitable for endovascular repair because they lack a sufficient proximal landing zone. In an effort to broaden the applicability of endovascular repair, the chimney technique has been introduced. This refers to deployment of a covered or bare-metal stent parallel to the main aortic endograft within the aneurysm, creating a conduit that runs outside the main aortic endograft into the aortic branches. We report the case of a 75-year-old male with a juxtarenal abdominal aortic aneurysm and multiple comorbidities who was treated successfully with an endovascular aneurysm repair using a chimney graft. (Korean J Med 2014;86:213-217)

방음 터널 설치에 따른 소음 저감 효과 연구

김다래(Da rae Kim),김태민(Tae min Kim),김정태(Jeung Tae Kim),손정곤(Jeung gon Son),박광현(Gwang hyeon Park),류래언(Raeeon Ryu) 한국소음진동공학회 2014 한국소음진동공학회 학술대회논문집 Vol.2014 No.10

High speed railroad car and high-rise apartment with development of railway technology cause different problems of noise contrary to the previous generation. It is the most efficient noise reduction countermeasure but we studied that is the way on noise propagation with sound proof wall or sound proof tunnel around railroad. But if it were railroad on bridge, additional cost which is more expensive than installing one on the ground is needed. So sound insulation material considering reducing weight of recent soundproof facilities must be selected. It is in this study that predicted and analyzed acoustical and structural effect for noise reduction by installing soundproof tunnel. If it were departmentalized into additional study, could be able to expect noise reduction effect of sound proof tunnel establishment on the bridge.

소형 잔향실을 이용한 재료의 차음 성능 민감도 연구

김다래(Da-Rae Kim),김태민(Tae-Min Kim),김정태(Jeung-Tae Kim),박광현(Gwang-Hyun Park),류래언(Le-On Ryu) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4

Reverberation chambers have been used to evaluate structural sound transmission characteristics. However, due to economic cost and spatial problems, scaled transmission chamber is a alternative. Scaled reverberation chamber needs correction factor to satisfy to have formation of complete diffuse field. This study is to draw correction factor to fit diffuse field in scaled reverberation chamber on frequency range satisfied with mass law. In order to draw correction factor, transmission loss is measured using two different specimens have over a certain stiffness. As a result, correction factor as one specimen have a limitation caused by altering frequency range to satisfy the masslaw of each plate that have different stiffness. And, in critical frequency range of specimen having bigger stiffness, corrected value of transmission loss is inappropriate to having a correction effect. Also it is considered that correction factor is more similar to based on the masslaw than on the numerical analysis. Therefore, it is possible to be obtainable from more approximate results of transmission loss on scaled reverberation chamber as a combination of correction factor by frequency using more than one specimen. Into additional study, it is supposed to verify improved correction factor by applying it to a variable of specimen and comparing results from real-scaled reverberation chamber.