인공신경망을 이용한 유역 내 침수피해 예측모형의 개발

정경진,Chung,Kyung-Jin,Chen,Huaiqun,Kim,Albert S 한국방재학회 2005 한국방재학회논문집 Vol.5 No.2

본 논문에서는 유역 내 침수피해를 예측할 수 있는 실현가능한 수단으로써 인공신경망의 활용에 대해 제안하고자 한다. 유역 내 다양한 환경인자에 의한 침수피해 예측모형의 구축을 위해 108개 중유역을 대상으로 1990년부터 2000년까지 강우량, 침수피해면적, 토지이용 등 총 27개의 매개변수를 선정하여 총 49개의 데이터 세트를 구성하였다. 연구결과, 침수피해는 강우량과 같은 기상정보 뿐 만 아니라 다양한 유역환경의 특성에 영향을 받는 것으로 나타났으며 인공신경망 모형에 의해 R=0.92 수준에서 예측값과 관측값이 잘 일치하는 것으로 나타났다. 따라서 인공신경망은 입력값들과 대응된 출력값들을 알고 있는 경우 과거와 현재의 시공간 정보를 활용하여 특정유역의 강우량에 따른 침수피해면적을 산정 할 수 있으며, 복잡하고 비선형적 역동성을 지니고 있는 유역 내 환경변화에 대한 예측모형으로 활용이 가능하다고 판단된다. 또한 인공신경망은 입력자료의 중요도를 평가하는데 이용될 수 있으며, 기존 모형에서 다루어지는 매개변수중요도를 정량화 시킬 수 있어 다른 모형의 매개변수 추정이나 보정에 도움을 줄 수 있을 것으로 판단된다. This paper presents the use of an Artificial Neural Network (ANN) as a viable means of forecasting Inundation Damage Area (IDA) in many watersheds. In order to develop the forecasting model with various environmental factors, we selected 108 watershed areas in South Korea and collected 49 damage data sets from 1990 to 2000, of which each set is composed of 27 parameters including the IDA, rainfall amount, and land use. After successful training processes of the ANN, a good agreement (R=0.92) is obtained (under present conditions) between the measured values of the IDA and those predicted by the developed ANN using the remaining 26 data sets as input parameters. The results indicate that the inundation damage is affected by not only meteorological information such as the rainfall amount, but also various environmental characteristics of the watersheds. So, the ANN proves its present ability to predict the IDA caused by an event of complex factors in a specific watershed area using accumulated temporal-spatial information, and it also shows a potential capability to handle complex non-linear dynamic phenomena of environmental changes. In this light, the ANN can be further harnessed to estimate the importance of certain input parameters to an output (e.g., the IDA in this study), quantify the significance of parameters involved in pre-existing models, and contribute to the presumption, selection, and calibration of input parameters of conventional models.

수종 그룹간 치은염 및 치태지수의 재현성에 대한 연구

정경진,문익상,채중규,김종관,Chung, Kyung-Jin,Moon, Ik-Sang,Chai, Jung-Kiu,Kirn, Chang-Kwan 대한치주과학회 1990 Journal of Periodontal & Implant Science Vol.20 No.2

충북도내 보육교사의 직무스트레스가 영유아 학대인식 및 실제행동과의 관계에 미치는 영향

정경진(Jeong, Kyung-Jin),정효정(Chung, Hyo-Chung) 한국영유아보육학회 2021 한국영유아보육학 Vol.- No.131

본 연구는 충청북도 보육교직원의 영유아 학대예방을 위한 어린이집 직무스트레스 수준을 살펴보고 학대에 대한 인식과 실제 행동과의 차이, 그리고 직무스트레스가 실제 학대에 영향을 미치는지 검증하고자 하였다. 이를 위하여 충청북도 소재 어린이집에 근무하는 보육교직원 374명을 대상으로 설문조사한 연구 결과는 다음과 같다. 첫째, 보육교직원의 직무스트레스 수준은 보통수준 2.54(SD=.60)으로 확인되었으며, 업무과부하가 3.4점(SD=.86)으로 가장 높고, 그 다음으로 학부모 관계 2.37(SD=.75), 원장지도력 2.25점(SD=.85), 동료관계 2.06(SD=.70) 순으로 나타났다. 둘째, 보육교사의 영유아 학대에 대한 인식은 성학대가 가장 높았으나 실제 행동에 대한 자기평가와의 차이는 정서학대와 신체학대를 더 많이 하는 것으로 나타났다. 셋째, 보육교사의 직무스트레스, 영유아 학대인식과 실제행동에 대한 상관관계 결과 동료관계에서 오는 갈등이나 의사소통의 부재로 인한 스트레스가 높으면 업무과부하와 원장의 지도력에 대한 직무스트레스가 가중되어 영유아의 실제 신체학대와 정서학대 행동에 부정적인 영향을 미치는 것으로 나타났다. 연구결과를 근거로 보육교사의 아동학대 인식과 태도에 따른 어린이집 아동학대 발생 원인을 파악하고 예방을 위해 현실성 있는 교육과 대책을 마련하는데 기초자료를 제공하고자 한다. The present study was conducted to investigate the job stress pattern in day care centers of the day care center teachers in Chungbuk with regard to the prevention of the infant abuse, the difference between the awareness of abuse and the actual committing, and the effect of their job stress on the actual abuse. The results of the survey conducted with 374 day care center teachers in Chungbuk are described below. First, the overall job stress level of the day care center teachers was at a normal level (2.54 points, SD=.60). The job stress score was highest in the work overload (3.4 points, SD=.86), followed by the relationship with the parents (2.37 points, SD=.75), the leadership of the manager (2.25points, SD=.85) and the collegiality (2.06 points, SD=.70). Second, the infant abuse awareness of the day care center teachers was highest in sexual abuse. Third, the correlations among the job stress of the day care center teachers, the awareness of infant abuse, and their actual committing showed that when there is a high level of stress due to the conflicts in the collegiality or lack of communication, the job stress caused by the lack of the manger’s leadership is increased, giving a negative impact on the actual committing of the physical abuse and emotional abuse of the infants. The results of the present study may provide the fundamental data to identify the causes of the child abuse at day care centers and prepare realistic educational programs and preventive measures.

논문 : 도시의 자연배수능력 평가를 위한 유역 내 환경특성과 침수피해면적의 관계

정경진 ( Kyung Jin Chung ) 빗물학회 2007 빗물 Vol.1 No.1

We have investigated how environmental characteristics around watershed influenced on inundation damage by analyzing the relation between inundated areas and environmental factors composing the watershed. Moreover, the purpose of this study was to establish the basic information for natural drainage capacity assessment in urban area. We sorted midium watershed of Han river and Nak-dong river, and selected 30 rainfall events during 1995 to 2000 according to high level of damage. We compared the characteristics of environmental factors composing the watershed around inundated area. The inundated area showed high watershed slope about 25% and it indicated the greatest damage around the watershed located in 200~300m of altitude. Besides, the great damage by inundation was occurred in the mountainous agriculture region, where the forest scale was high and the urbanization was being progressed gradually. However, inundated area was small in case of grassland, water zone such as riparian area, bare ground and wetland. Moreover, the inundated area was different according to river shape and characteristics of river distribution such as the density of the stream order, conservation constant of the river system, and the number of undulations in the watershed. Therefore, it showed that land use, river shape and distribution characteristics of stream influence on inundation. Consequently, the inundated area represented different tendency according to watershed environment and rainfall condition, so the environmental characteristics composing the watershed seemed to influence on the scale of inundation damage. Therefore, the assessment of natural drainage capacity in urban area should be considered with environmental factors in watershed as well as artificial facilities for natural disaster prevention.

식재용 블록을 이용한 옹벽 녹화 기법에 관한 연구(I) - Eco-Stone의 시공 사례를 중심으로 -

한성식,정경진,Han, Sung-Sik,Chung, Kyung-Jin 한국환경복원기술학회 1999 한국환경복원기술학회지 Vol.2 No.1

The retaining wall is a structure which was made for changing land form in many construction. The first role of the retaining wall is to maintain the slope stability. But recently, the amount of retaining wall have been increasing because of the expansion of construction works and the amenity of urban environment have been decreasing because of environmental destruction and the scenic heterogeneity. So we should consider the slope stability and ecological stability at the same time. The purpose of this study is to develop the retaining wall revegetation technology using the Eco-Stone, the structure of co-satisfying which included the slope stability and the revegetation effect. Eco-Stone is a structure which has high stability for earth pressure, settlement and drainage. And cost and term of construction works also have been decreased. Eco-Stone structure is one of factors composing the ecological network which is harmonize with surrounding environment. In this way, it is expected that the ecological habitats of various species would be restored.

상황맥락적인 피드백을 활용한 CAI가 화학 학습에 미치는 효과

김경순,정경진,차정호,강이영,노태희,Kim, Kyung-Sun,Chung, Kyoung-Jin,Cha, Jeong-Ho,Kang, Yi-Young,Noh, Tae-Hee 대한화학회 2007 대한화학회지 Vol.51 No.2

이 연구에서는 컴퓨터 보조 수업에서 상황맥락적인 피드백의 활용이 학생들의 개념 이해도, 과학 학습동기, 컴퓨터 보조 수업에 대한 인식에 미치는 효과를 조사하였다. 인천시의 한 남녀 공학 중학교에 있는 1학년 114명의 학생들을 상황맥락적 피드백 CAI, 피드백 CAI, CAI 집단에 배치하고, 8차시 동안 ‘물질의 세 가지 상태'와 ‘분자의 운동'에 대하여 수업을 실시하였다. 구획변인은 중간고사 과학 성적을 사용하였다. 이원 공변량 분석 결과, 사전 과학 성취 수준에 관계없이 상황맥락적 피드백 CAI 집단의 개념 이해도 점수가 다른 CAI 집단에 비해 높았고, 그 점수 차이가 통계적으로 유의미하였다. 상위 학생들의 경우 피드백 CAI 집단의 과학학습 동기 점수가 CAI 집단의 점수보다 통계적으로 유의미하게 높았으나, 하위 학생들의 경우에는 세 집단 간 점수 차이가 통계적으로 유의미하지 않았다. 컴퓨터 보조 수업에 대한 인식의 경우, 상황맥락적 피드백 CAI 집단과 피드백 CAI 집단의 상위 학생들은 CAI 집단의 상위학생에 비해 컴퓨터 보조 수업에 대해 긍정적으로 인식하였다. 피드백 CAI 집단의 하위 학생들은 다른 두 CAI 집단보다 부정적인 인식이 약간 높았다. 교육학적 함의를 논의하였다. This study investigated the effects of situational context feedback in CAI upon students' conceptual understanding, science learning motivation, and the perception of CAI. Seventh graders (N = 114) from a coed middle school in Incheon were assigned to the situational context feedback CAI (SCF-CAI), the feedback CAI (F-CAI) and the CAI groups, and were taught about ‘three states of matter' and ‘motion of molecules' for 8 class hours. Prior science achievement test score used as a blocking variable. Two-way ANCOVA results revealed that the conceptual understanding test scores of the SCF-CAI group were significantly higher than those of the other groups. For the higher achievers, the scores of the F-CAI group in science learning motivation test were significantly higher than those of the CAI group. However, there was no significant difference among the lower achievers of three groups. The higher achievers in the SCFCAI and the F-CAI groups perceived the CAI more positively than those of the CAI group. The lower achievers in the FCAI group perceived the CAI more negatively than those of the other groups. Educational implications are discussed.

왓챠 사용자 유형 분류를 통한 영화 추천 서비스 개선 제안

진혜란(Helane Jin),김현숙(Hyun Suk Kim),정경진(Kyung Jin Chung),강연아(Youn Ah Kang) 한국HCI학회 2019 한국HCI학회 학술대회 Vol.2019 No.2

인공지능(AI) 기술이 다양한 분야에서의 콘텐츠 큐레이션 기술과 결합 되면서 추천 서비스가 발전하고 있다. 영화 큐레이션 플랫폼의 증가에 따라 여가생활의 형태의 변화, 취향에 맞는 콘텐츠를 찾고자하는 니즈도 더욱 증가하고 있다. 본 논문에서는 질적방법론으로 영화 추천 서비스 왓챠(Watcha) 사용자 유형화를 시도하고 인문적인 요소를 반영하여 영화큐레이션 서비스 개선하는 방안을 모색한다.

가요성지수재가 접합된 프리캐스트 콘크리트 관로의 비액상화지반 측방유동에 대한 응답특성

이준구(Lee Jun Gu),김옥수(Kim Ok Soo),김민정(Kim Min Jung),김민혜(Kim Min Hye),정경진(Chung Kyung Jin) 대한토목학회 2006 대한토목학회 학술대회 Vol.2006 No.10

천이를 고려한 진동하는 익형의 동적 실속 예측

전상언(Sang Eon Jeon),박수형(Soo Hyung Park),김창주(Chang Joo Kim),정기훈(Ki Hoon Chung),정경진(Kyung Jin Jung) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.5

A Reynolds-Averaged Navier-Stokes (RANS) code with transition prediction model is developed and the computational results on an oscillating airfoil are compared with the experimental data for OA209 airfoil. An approximated eN method that can predict transition onset points and the length of transition region is directly applied to the RANS code. The hysteresis loop in dynamic stall is compared for the computational results using transition prediction and fully turbulent models with the experimental data. Results with transition prediction show more correlation with the experimental data than the fully turbulent computation.

초내식성 스테인리스강 선재와 브라켓의 내식성 및 금속 이온 용출 특성

오근택,정경진,황충주,박용수,김경남 大韓齒科器材學會 2001 대한치과재료학회지 Vol.28 No.4

Metallic orthodontic appliances are known to release metal ions in an oral cavity. It is not advisable that toxic corrosion products derived from the appliances is absorbed into the body. Metal ions release from orthodontic appliances is known to have large effects on the result of orthodontic treatment and systemic health. Metal bracket and wire were made of super stainless steel(S32050) with high corrosion resistance. The corrosion resistance and ion release property of S32050 and conventionally used appliances were examined. Four types of wire were ligated in either super stainless steel(SB) or Tomy bracket(TB) with O-ring, and then each group was immersed in an artificial saliva at 37℃ for 12 weeks. Amount of released metal ions was measured with immersion time by graphite furnace atomic absorption spectroscopy and surface morphology was investigated. S32050 showed the low passive current density of about 1 μA/㎠ and the stable passive region to a high potential in artificial saliva. S32050 appliances did hardly release nickel ions in artificial saliva. S32050 wire(SRW) and NiTi wire(NW) didn't show significant difference of Ni ion release with immersion time, meanwhile, Remanium wire(RW) showed significant difference in 12 weeks. Ni ion releasce from the brackets didn't show any significant difference with immersion time and between SB and TB. Amounts of Ni ion released from TB-SRW showed significant difference in 12 weeks, those from TB-RW showed significant difference from 4 weeks later and highest release among all groupsin12weeks. TB-NW released little Ni ion for all immersion time and showed significant difference from 4 weeks later, TB-TW(TMA wire) showed significant difference in 12 weks. SB-SRW didn't show any significant difference and SB-RW signigicant difference in 12 weeks,but lower compared with TB group. SB-NW and SB-TW didn't show any significant difference. Corrosion products didn't be observed in mostly groups during the immersion time, except that in TB-RW, they were observed on the bracket surface between O-ring and wire from 8 weeks later. Super stainless steel wire had good corrosion resistance compared with stainless steel wire, and it is believed that it can be used as orthodontic material for bracket and wire.