화천 지역의 수문분석을 위한 SWAT 모형의 적용성 평가

김기철,김종건,박윤식,허성구,유동선,김기성,최중대,임경재,Kim, Gi-Cheol,Kim, Jong-Geon,Park, Yun-Sik,Heo, Seong-Gu,Yu, Dong-Seon,Kim, Gi-Seong,Choe, Jung-Dae,Im, Gyeong-Jae 한국관개배수위원회 2007 한국관개배수논문집 Vol.14 No.2

For sustainable development at a watershed, environment friendly site-specific management practices need to be developed and implemented. The soil and Water Assessment Tool(SWAT)model has been world-wide used to estimate stream flow, sediment, and nonpoint source pollutant loads, and effects on water quality of different management practices. In this study, the SWAT model was used to estimate the flow resources at Hwacheon areas using Digital Elevation Model(DEM),Land use, precipitation ,wind ,maximum and minimum temperature, solar radiation, humidity of watershed The R2 value and EI value for the comparison of SWAT estimated flow and measured flow were 0.87 and 0.67 respectively for calibration period, and the R2 value and E1 value for validation were 0.75 and 0.67 respectively. The comparison results show what the SWAT model is applicable to simulate hydrology behaviors at this study watershed.

산업장 근로자의 근골격계 자각증상과 스트레스의 평가

김기철,박승정,장두섭,김삼태,김유철,권소희,정해경,송용선,이기남,Kim Ki-Chul,Park Sung-Jung,Jahng Doo-Sub,Kim Sam-Tae,Kim Yoo-Chul,Kwon So-Hee,Jung Hae-Kyoung,Song Yung-Sun,Lee Ki-Nam 대한예방한의학회 2004 대한예방한의학회지 Vol.8 No.1

This study was conducted to evaluated musculoskeletal subjective symptoms and the degree of stress of industrial workers to present fundamental materials of preventive oriental medicine for improving their health and quality of life. During the medical examination with oriental medicine method, presence of subjective symptoms of musculoskeletal pain, Psychosocial Well-being Index(PWI) and life style were checked by using questionnaire method in 474 industrial workers. The collected data were analyzed with crosstabs, ANOVA and T-test. The results were as follows; 1. In general differences according to musculoskeletal subjective symptoms, education level of high school graduation had significantly higher distribution than that of below middle school or above university graduation in the pain present group. 2. In the musculoskeletal subjective symptoms and the degree of stress, all of Factor1, Factor2. Factor3, Factor4. and PWI had higher score in pain present group than in pain free group and the difference was statistically significant. 3. According to degree of stress and general character of subjects, single and education level of high school graduation had high score in Factor2, Factor3 and PWI. Factor1 and Factor3 was high in income group of low 1.49 million won. Factor2, Factor4, and PWI was high significantly in income group of 1.50 - 2.99 million won. In job type, manufacturing worker group had significantly high score in Factor3. 4. In degree of stress and life style difference, there was significant difference in PWI score in the field of alcohol chinking, smoking, exercise, obesity except sleeping hours. In the present study. as a result, it is found out that musculoskeletal subjective symptoms present group had higher score in psychosocial stress across the fields than symptom-free group and it is recommended that continuous studies on the relationship of job-related musculoskeletal disorders and psychosocial stress should be performed for improvement and prevention of mental and physical health of industrial worke

국내산 및 중국산 십전대보탕 재료의 구조탄수화물과 식이섬유에 관한 연구

김기철,김지민,김대진,Kim Ki-Chul,Kim Ji-Min,Kim Dae-Jin 한국생명과학회 2005 생명과학회지 Vol.15 No.1

십전대보탕에 들어가는 한약재 10종을(국산 7종, 중국산 10종)을 수집하여 일반성분과 중성세제섬유소(neutral detergent fiber, NDF), 식이섬유(total dietary fiber, TDF; insoluble dietary fiber, IDF; soluble dietary fiber, SDF)를 분석하였다. 십전대보탕 재료 중 국내산 7종, 중국산 10종에 있어서 일반성분과 식이섬유는 국내산과 중국산간의 차이가 크지 않았다. 그러나 중성세제섬유의 경우 건조물 기준으로 국내산 $35.24\%$, 중국산 $58.64\%$로 차이가 크게 나타났다 국내산 7종의 총탄수화물(CHO)과 NDF 간에는 Y=0.32X+60.96, r=0.61(p<0.01), 총탄수화물(CHO)과 NFE간에는 Y=0.65X+32.88, r=0.76(p<0.001)로서 유의한 회귀식과 상관이 도출되었다. 그러나 총탄수화물(CHO)과 NFC간에는 Y=-0.07X+80.93, r=0.10로서 회귀식이 도출되었으나 유의성은 없었다. 중국산 10종의 총탄수화물(CHO)과 NDF간에는 Y=0.53X+49.64, r=0.69(p<0.001), 총탄수화물(CHO)과 NFE간에는 Y=0.50X+46.42, r=0.71 (p<0.01)로서 유의한 회귀식과 상관이 도출되었다. 그러나 총탄수화물(CHO)과 NFC간에는 Y=0.10X+78.21, r=0.10로서 회귀식이 도출되었으나 유의성은 없었다. 국내산 7종의 TDF와 IDF간에는 Y=0.96X+4.08, r=0.99(p<0.01), TDF와 SDF간에는 Y=-6.87X+62.97, r=0.51(p<0.01)로서 유의한 회귀식과 상관이 도출되었다. 중국산 10종의 TDF와 IDF간에는 Y=0.96X+3.14, r=0.99(p<0.01), TDF와 SDF간에 Y=-8.71X+58.96, r=0.50(p<0.01)로서 유의한 회귀식과 상관이 도출되었다. 국내산과 중국산 7종 식이섬유의 t-test 결과 TDF와 IDF는 평균이 양측검정결과 유의하게 다르지 않았으나 SDF는 평균이 유의하게 달랐지만 단측검정 결과 유의하지 않았다. This study was conducted to determine the total carbohydrate (CHO), nitrogen free extract (NFE), non fiberous carbohydrate (NFC) and ditery fiber (NDF, neutral detergent fiber; TDF, total dietary fiber; IDF, insoluble dietary fiber; SDF, soluble dietary fiber) of 17 kinds of domestic and Chinese herbs. The samples were dried at 60t for 24 hrs and ground to pass a 0.5mm screen. The contents of NFE was ranged from $85.73\%\;to\;57.57\%$, NDF was ranged from $85.72\%\;to\; 29.74\%$, CHO was ranged from $92.68\%\;to\;63.01\%$, TDF was ranged from $87.33\%$to 17.21, IDF was ranged from $86.37\%\;to\;14.56\%$, SDF was ranged from $6.06\%\;to\;0.97\%$ on domestic herbs in dry matter basis. NFE was ranged from $95.33\%\;to\;35.24\%$, NDF was ranged from $71.48\%\;to\;29.74\%$, CHO was ranged from $78.77\%\;to\; 35.24\%$, TDF was ranged from $86.43\%\;to\;16.22\%$, IDF was ranged from $85.98\%\;to\;13.04\%$, SDF was ranged from $4.13\%\;to\;0.45\%$ on Chinese herbs in dry matter. The several components of domestic and Chinese herbs were not significantly of TDF and IDF, but SDF was significantly by tow-tailed test. The correlationship of several herbs were r=0.99 between TDF and IDF (p<0.01), r=0.51 between TDF and SDF (p<0.01)on domestic herbs. The correlationship of 10 kinds herbs r=0.99 between TDF and IDF (p<0.01), r=0.50 between TDF and SDF (p<0.01) on Chinese herbs, respectively.

하부구조의 강성변화에 따른 대공간구조물의 지진거동

김기철,강주원,고현,Kim, Gee-Cheol,Kang, Joo-Won,Ko, Hyun 한국공간구조학회 2010 한국공간구조학회지 Vol.10 No.3

대공간구조물은 일반 라멘구조와는 다른 동적특성을 가지고 있으며, 이런 동적특성에 관해 많은 연구가 수행되고 있다. 그러나 대부분의 연구는 특정 형태의 대공간구조물에 대해 수행되었으며, 내진설계를 위해 직접적으로 이용 가능한 연구결과는 매우 제한적이다. 본 연구에서는 대공간구조물의 기본적인 동적특성을 내재한 트러스-아치구조물을 대상으로 양단의 기둥의 길이가 다른 경우에 트러스-아치구조물의 지진응답변화를 분석하고자 한다. 양단 기둥 길이의 차이에 따라, 가속도 응답이 수평방향에 비해 수직방향에서 더 많은 영향을 받는다. 따라서 상부구조물을 지지하는 하부구조물의 강성이 다른 경우에 대공간구조물의 내진설계에 있어서 수직방향 응답에 대한 고려가 더욱 많이 요구된다. Large spatial structures have the different dynamic characteristics from general rahmen structures and many studies on dynamic behavior of it is conducted. But most studies was conducted about the particular shape of large spatial structures and, directly, the usable results of studies are very limited for seismic design of large spatial structures with the lower structure. So, this study is conducted about the truss arch structure that the basic dynamic characteristics of large spatial structure is inherent in, and the change of its seismic response is analyzed when columns have different length on both ends of it. According to the difference of column's length on both ends, the vertical acceleration response of truss arch structure is affected more than the horizontal acceleration response of it. Therefore, when the stiffness of lower structures that support the upper structure is different, the consideration of the vertical response is significantly required for the seismic design of large spatial structures.

해양구조용강 용접부의 염수부식에 관한 연구

김기철,이종봉,윤승열 ( K . C . Kim,J . B . Lee,S . R . Yoon ) 한국부식방식학회 1983 Corrosion Science and Technology Vol.12 No.3

MR 감쇠기에 대한 성능평가 실험

김기철,강주원,Kim, Gee-Cheol,Kang, Joo-Won 한국공간구조학회 2008 한국공간구조학회지 Vol.8 No.6

다중지점 지진하중에 대한 아치구조물의 지진응답 분석

김기철,강주원,Kim, Gee-Cheo,Kang, Joo-Won 한국공간구조학회 2013 한국공간구조학회지 Vol.13 No.4

Spatial structures have the different dynamic characteristics from general rahmen structures. Therefore, it is necessary to accurately analyze dynamic characteristics and seismic response for seismic design of spatial structure. Keel arch structure is used as an example structure because it has primary characteristics of spatial structures. In case of spatial structures with different ground condition and time lag, multiple support excitation may be subjected to supports of a keel arch structure. In this study, the response of the keel arch structure under multiple support excitation and with time lag are analyzed by means of the pseudo excitation method. Pseudo excitation method shows that the structural response is divided into two parts, ground displacement and structural dynamic response due to ground motion excitation. It is known that the seismic responses of spatial structure under multiple support excitation are different from those of spatial structure under simple excitation. And the seismic response of spatial structure with time lag are different from those of spatial structure without time lag. Therefore, it has to be necessary to analyze the seismic response of spatial structure under multiple support excitation and time lag because the spatial structure supports may be different and very long span. It is shown that the seismic response of spatial structure under multiple support seismic excitation are different from those of spatial structure under unique excitation.

공간구조물의 지진응답 저감을 위한 중간면진장치의 적용

김기철,강주원,김형만,Kim, Gee-Cheol,Kang, Joo-Won,Kim, Hyung-Man 한국공간구조학회 2009 한국공간구조학회지 Vol.9 No.4

면진장치는 기초와 구조물 사이 에 면진장치를 설치하여 상부로 전달되는 지진에너지를 감소시키는 장치로 면진장치의 설치위치에 따라서 기초면진과 중간(지붕)면진으로 구분할 수 있다. 본 연구에서는 면진장치 설치 위치에 따른 아치구조물의 지진응답을 비교 분석하여 면진장치의 효용성을 검증하였다. 지붕면진 시스템은 기초면진 시스템과 비교하여 상부 지붕구조의 지진응답 저감에 있어서 보다 효과적이다. 또한 하부구조와 상부구조의 강성 및 질량변화 그리고 시공성에 있어서 지붕면진이 기초면진 시스템 보다 우수한 것으로 사료된다. The seismic isolation system reduces the seismic vibration that is transmitted from foundation to upper structure. This seismic isolation system can be classified into base isolation and mid-story isolation by the installation location. In this study, the seismic behavior of arch structure with mid-story isolation is analyzed to verify the effect of seismic isolation. Mid-story isolation is more effective than base isolation to reduce the seismic responses of roof structure. Also, this isolation would be excellent in structural characteristics and construction.

아치구조물 적용 인장저항 면진장치의 수치해석적 거동 분석

김기철,장명호,Kim, Gee-Cheol,Jang, Myung Ho 한국공간구조학회 2020 한국공간구조학회지 Vol.20 No.3

If an excessive displacement occurs in the base isolation system, the structure will be damaged due to overturning of the upper structure. In this study, we analyze the behavior of base isolation by applying earthquake to base isolation with anti-uplift device. In the case of structures that generate horizontal reaction forces such as arch structures, horizontal reaction forces must be considered in the design of the base isolation and structural members. And anti-uplift device for preventing the excessive displacement of the base isolation system is needed.

면진 트러스-아치 구조물의 지진거동 분석

김기철,김광일,강주원,Kim, Gee-Cheol,Kim, Kwang-Il,Kang, Joo-Won 한국공간구조학회 2008 한국공간구조학회지 Vol.8 No.2

The various systems as the seismic resistance systems are used to reduce the seismic response of structure. And the seismic isolation system among them is the system that reduces the seismic vibration to be transmitted from foundation to upper structure. The purpose of isolation system is to lengthen the period of structure and make its period shift from the dominant period of earthquake. In this study, the seismic behavior of arch structure with lead rubber bearing(LRB) and friction pendulum system(FPS) is analyzed. The arch structure is the simplest structure and has the basic dynamic characteristics among large spatial structures. Also, Large spatial structures have large vertical response by horizontal seismic vibration, unlike seismic behavior of normal rahmen structures. When horizontal seismic load is applied to the large spatial structure with isolation systems, the horizontal acceleration response of the large spatial structure is reduced and the vertical seismic response is remarkably reduced. 지진에 의한 구조물의 응답을 저감시키기 위하여 내진, 면진, 제진 등 다양한 장치가 사용되고 있으며 그 중에서 면진장치는 구조물로 전달되는 지진에너지를 최소화하기 위한 시스템으로 그 주된 목적은 구조물의 주기를 길게 만들어 지진파의 탁월주기를 벗어나게 하는 것이다. 본 연구에서는 대공간구조물의 기본적인 동적특성을 가지고 있으며 동시에 가장 간단한 구조이기도 한 아치에 납-고무면진장치와 마찰진자면진장치를 적용하여 지진거동을 분석하였다. 대공간구조물의 지진거동은 일반적인 골조구조물의 지진거동과 달리 수평지진에 의하여 수직방향으로 큰 지진응답이 나타나고 있다. 면진장치를 대공간 구조물에 적용할 경우에 수평지진하중에 의하여 수평방향 지진응답이 저감되는 것은 물론 면진장치의 수직강성으로 인하여 수직응답도 현저하게 저감되는 것을 알 수 있었다.