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소규모 행정구역의 일단위 농업가뭄 평가를 위한 농업용수 수급 가뭄지수 개발
이상권(Lee, Sangkwon),오국열(Oh, Kukryul),정상만(Jeong, Sangman),정태성(Cheong, Tae Sung) 한국방재학회 2021 한국방재학회논문집 Vol.21 No.2
가뭄은 장기간의 강수량 부족과 수자원 부족으로 인해 발생하는 것으로써 인간과 동물 모두의 생명과 생태계에 큰 영향을 미친다. 특히 농업분야는 식량안보와도 밀접한 연관성이 있어 그 중요성이 크다고 할 수 있다. 전 지구적으로 지구온난화, 도시화 및 산업화로 인해 농업용수 수요는 꾸준히 증가하고 있으며, 한국 또한 기후변화로 인해 증가추세에 있는 농업분야 피해경감을 위해 농업용수 공급원을 꾸준히 개발해오고 있다. 가뭄은 기상학적, 농업, 수문학적, 사회경제학적 가뭄지수를 이용하여 그 심각정도를 평가하는데, 농업가뭄지수는 토양수분과 농작물 마름 정도를 이용하여 가뭄을 평가하고 수문학적 가뭄지수는 저수지, 댐, 하천, 지하수 등 공급 가능한 수자원과 수요를 비교하여 용수 부족량으로 가뭄을 평가하는 방법이다. 그러나 이들 방법들은 생활, 공업, 농업 전체용수의 부족량을 평가함에 따라 상대적으로 민감도가 낮은 농업용수를 과대 혹은 과소평가하는 것으로 나타났다. 따라서 본 연구에서는 농업용저수지, 관개 및 배수, 지하수 시스템과 같은 용수 공급 시스템과 농업용수 수요량을 분석하여 농업가뭄을 평가하는 농업용수 수급 가뭄지수(Agricultural Water Demand and Supply Drought Index, AWDSDI)를 개발하였다. 개발된 가뭄지수의 적용성을 검토하기 위하여 과거 기록을 토대로 가뭄피해가 컸던 2017년 6~8월에 대해 진천군, 창녕군, 장성군 등 3개 군의 32개 읍⋅면에 AWDSDI를 적용하고 농업가뭄을 평가하였다. 적용성 검토결과 AWDSDI는 읍⋅면과 같은 소규모 행정구역의 일단위 농업가뭄을 잘 재현하는 것으로 나타났다. 더불어 개발된 가뭄지수를 검증하기 위하여 AWDSDI와 기존에 개발된 농업가뭄지수 그리고 수문학적 가뭄지수의 평가결과를 함께 비교하였다. 비교 결과 AWDSDI는 기존에 개발된 가뭄지수들보다 3개군 32개 읍⋅면의 가뭄기간 및 가뭄심도를 잘 재현하는 것으로 나타났다. Drought is caused by a long period of lack of rainfall and water resources, and has a great impact on the life and ecosystem of both humans and animals. It is particularly important for the agricultural sector, which is closely related to food security. Global warming, urbanization, and industrialization have led to a gradually increasing demand for agricultural water. In response, Korea has steadily developed its agricultural water sources to reduce rising damage to the agricultural sector due to climate change. The severity of drought is evaluated by using meteorological, agricultural, hydrological, and socioeconomic drought indexes. The agricultural drought index is evaluated using soil moisture and crop dryness, and the hydrological drought index is evaluated based on water shortage by comparing demands with water resources available for supply, such as rivers and groundwater, reservoirs and dams. However, these methods were found to over- or under-estimate the relatively low sensitivity of agricultural water as they assess the shortage of water for life, industry, and agriculture. Therefore, in this study, we developed the Agricultural Water Demand and Supply Drought Index (AWDSDI), which evaluates agricultural drought by analyzing water supply systems such as agricultural reservoirs, pumping stations and drainage, groundwater systems, and demands for agricultural water. In order to review the applicability of the developed drought index, AWDSDI was applied to 32 Eps and Myuns in three cities, including Jincheongun, Changnyeonggun, and Jangseonggun in the period June-August 2017, when drought damage was significant. It was found that AWDSDI reproduced the daily agricultural drought well in small administrative districts such as Eps and Myuns. In addition, in order to verify the developed drought index, the evaluation results of AWDSDI, the previously developed agricultural drought index and the hydrological drought index were compared together. The comparison found that the AWDSDI reproduced the drought period and drought depth in 32 Eps and Myuns in three cities better than previously developed drought indices.
이상권(Sangkwon Lee),김병수(Byungsoo Kim),박동철(Dongchul Park),정승균(Seunggyoon Jung) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In our previous study, we have developed sound quality index for steady rumbling sound of passenger car. In this paper, we will study sound quality index for transient rumbling noise. The subjective evaluation of rumbling sound can be indicated to objective parameters by sound metrics of psychoacoustics and principal rumble component. And artificial neural network can be estimated complexity and nonlinear characteristics of relation between subjective evaluation and sound metrics. We applied to sound metrics and artificial neural network to development of sound quality index for transient rumbling sound of passenger car.
이건희(Kunhee Lee),신태진(Taejin Shin),이상권(Sangkwon Lee),김근영(Keunyoung Kim) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
These days, drivers are not satisfied with simply being the cabin noise reduced, but demand to hear better sound in the cabin. Therefore, Automobile companies are conducting a lot of research in order to reduce the noise by considering the feelings of the drivers. In this study, we have investigated the relationship between sound-absorbing materials and sound quality based on ray acoustics and signal processing. First, the impulse response functions from engine to dash and from dash to driver’s position are calculated using ray tracing method. Second, two impulse response functions are convoluted by engine noise signal to yield the cabin noise. The cabin noise are used for the calculation of sound metric and the subjective test. The correlation between sound metric and subjective test are used and estimated for the production of sound quality index in accordance with sound-absorbing materials. The experimental method is also performed for the validation of index. The index will contribute to saving test time and developing a good performance sound-absorbing material.
Science DMZ 환경에서의 컨테이너 기반 협업연구 플랫폼 구성 및 성능 측정
홍원택 ( Wontaek Hong ),이상권 ( Sangkwon Lee ),김기현 ( Kihyeon Kim ),문정훈 ( Jeonghoon Moon ) 한국정보처리학회 2021 한국정보처리학회 학술대회논문집 Vol.28 No.1
고성능 네트워크를 기반으로 하는 과학응용 협업연구 환경에서 대용량 데이터의 고속 전송을 위해 활용되고 있는 전용의 데이터 전송 노드는 이용률을 감안하여 연산을 위한 부수적인 목적을 위해 활용이 가능하다. 본 논문에서는 이러한 분산된 데이터 전송 노드들을 활용한 컨테이너 기반 협업연구 플랫폼의 구성 사례를 소개하고 해당 플랫폼 상에서 분산 학습을 실험하고 소요시간 측면에서 성능을 측정하여 제시한다.
김성종(Sungjong Kim),이상권(Sangkwon Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The objective of this paper is to estimate the excitation force at the mount brackets of powertrain. The powertrain excitation force on mount bracket is used for the prediction of the vehicle interior noise induced by hybrid transfer path analysis. In order to do this research, a powertrain geometry model must be based on the real powertrain model, and its finite element model is made by meshing software. The multibody dyncamic model is based on the EMA(experimental modal analysis) and FEA(finite element analysis). The experimental modal analysis and operational deflection shape for powertrain are experimentally implemented. After the MBD model is assembled with vibration characteristic properties both EMA and FEA result. Then, the MBD model of ADAMS resemble the vibrational property of real powertrain. Consequently. ADAMS result of powertrain excitation forece is compared and verified with measured values.