목표 유수율 달성을 위한 유수율 제고 전략 산정 방법론 개발 및 적용

김동홍,김가영,손동완,최태호 대한상하수도학회 2022 상하수도학회지 Vol.36 No.6

This study set up the revenue water ratio that could be achieved within the range of the expenses of the water distribution network maintenance project, developed an analysis methodology that could estimate the additional project quantity to achieve the target revenue water ratio of 85% and applied and verified that to S. City. This methodology allowed the distribution of the leakage quantity for each leakage component by the pipeline through the total revenue water account balance analysis and BABE approach and the redistribution into the calculated leakage quantity more accurately through a step test. In addition, the level of reduction in leakage and the quantity of the project were estimated before and after the application of four strategies for the promotion of the revenue water ratio presented by IWA, according to the leakage components by the pipeline. As a result of the application of this analysis method to S. City, it would be possible to achieve up to the revenue water ratio of 81.0%, which was 74.7% in the beginning, if the water distribution network maintenance project was promoted within the range of the project expenses, and to achieve the revenue water ratio of 85.0%, the goal of the project, it would be necessary to replace the pipeline of 22.2% of the entire pipelines in the target area. As a result of the re-estimation of the revenue water ratio achievable, applying the actual water distribution network maintenance quantity in the scope of the business with the results of this analysis, the revenue water ratio was 81.7% while the actually measured revenue water ratio was 82.3%. Thus, the reliability of this analysis method could be secured to some extent.

사이버안전을 위한 보험 활용 전략

김동홍 한국품질경영학회 2022 한국품질경영학회 학술대회 Vol.2022 No.1

5G, 클라우드 컴퓨팅, 인공지능, 메타버스와 가상현실 등과 같은 디지털화는 코로나19로 인해 더욱 가속화되고 있으며, 이러한 급속한 디지털화는 기업에게 새로운 기회로 작용하지만 동시에 비인가자의 원격접속, 단순한 비밀번호, 보안되지 않은 네트워크, 개인기기의 오용, 악의적인 사이버 공격 등으로 사이버 위험 확대를 가속화하고 있다. 최근 기업은 사이버 위협에 대해 네트워크 보안 강화, 중요 시스템과 데이터 백업, 멀웨어 방지 Tool, ID 및 액세스 관리, IT 보안자문 등 선제적 사이버 보안조치를 지속 강화하고 있으나, 악의적인 해커와 국가를 배후로 하는 사이버범죄 활동으로 인한 비용은 2015년 3조 달러에서 2025년에 최대 10.5조 달러로 지속적 증가가 예상되는 등 사이버 위험은 커지고 있다. 사이버 위험 증가에 대해 국내 대부분 기업은 개인정보 유출·누출에 따른 법률상 배상책임 보장에 보험을 제한적으로 활용하고 있으나, 미국과 유럽 등에서는 랜섬웨어 등 악의적 공격에 대해 100% 사전 방어가 불가능한 상황을 인지하고 Cyber Risk Consulting, 데이터 복구비용, 배상책임 비용, 영업손실비용, 사고처리비용 (포렌식조사, 법률 컨설팅, 커뮤니케이션 등) 헷지 등 보험을 위험관리수단으로 적극적으로 활용하고 있다. 국내 기업 및 공공기관에서도 신종 사이버 위험과 악의적인 사이버 공격 증가에 따른 비용 변동성을 최소화하고 사업 지속성을 확보하기 위해 새로운 사이버 위험 관리수단으로 사이버 보험을 적극 활용하는 것이 필요하다. 본 연구에서는 사이버 위험 유형, 사이버 피해사례, 국내·외 사이버 위험 관련 법·제도 비교, 해외 선진국가의 사이버보험 활용사례 등을 분석하여 국내 기업과 공공기관의 사이버 안전을 위한 보험 활용방안을 제시하였다.

경제성을 고려한 지방상수도 목표 유수율 산정

김동홍,최태호,이재범,송정관 대한상하수도학회 2023 상하수도학회지 Vol.37 No.6

As an advanced study on the method of calculating the target revenue water ratio of local waterworks through the leakage component analysis method proposed by Kim et al. (2022), this study developed a model to calculate the achievable revenue water ratio within the specified project cost, the required project cost to achieve the specified target revenue water ratio, and the economically appropriate target revenue water ratio level by considering the leakage reduction cost and leakage reduction benefit for each revenue water ratio improvement strategy, and conducted an applicability evaluation of the developed model using actual field data. The procedure for calculating the target revenue water ratio of local waterworks considering economics proposed in this study consists of three stages: physical data linkage model construction, leakage component analysis, and economic analysis, and the applicability was evaluated for Zone H with branch type and the Zone M network type. As a result of the application, it was calculated that approximately 32.5 billion won would be required to achieve the target revenue water ratio of 70% in the Zone H, and approximately KRW 10.5 billion would be required to achieve the target revenue water ratio of 75% in the Zone M. If the business scale of Zones H and M was corrected to 10,000 ㎥/day of water usage, the required project cost for a 1% improvement in the revenue water ratio of Zone H was calculated to be 0.7642 billion won and 0.4715 billion won for Zone M.

알쯔하이머형 치매와 혈관성 치매환자에서의 ALDH2와 APOE 유전자의 다형성에 관한 연구

김동홍,김영돈,이창화,엄기춘,김은식,윤경식,김동희 대한생물치료정신의학회 2002 생물치료정신의학 Vol.8 No.2

연구목적: 본 연구는 국내 치매환자들을 대상으로 치매발병의 위험요소가 될 수있는 ALDH2와 APOE 유전자형이 어떤 양상으로 나타나는지 알아보기 위하여 시행되었다. 방 법: 충남 부여군에 위치한 부여노인병원에 입원중인 65세 이상의 알쯔하이머형 치매와 혈관성 또는 혼재성 치매환자 59명(남:19, 녀:40)을 대상으로 ALDH2와 APOE 유전자형을 제한효소법에 의하여 조사하였고 치매유형에 따른 유전자형과 대립유전자의 빈도를 비교하였다. 결 과: 1) 알쯔하이머형 치매환자군에서 혈관성 또는 혼재성 치매환자군보다 ALDH2*(-/2)유전자형의 빈도가 높았으나 통계학적으로 의미있는 차이는 없었다. 2) 알쯔하이머형 치매화자군에서 혈관성 또는 혼재성 치매환자군보다 APOE*(-/ε4) 유전자형의 빈도가 높았으나 통계학적으로 의미있는 차이는 없었다. 3) APOE*ε4와 ALDH2*2를 알쯔하이머병의 균등한 위험대립유전자로 가정하고 각 유전자형의 대립유전자의 수를 점수화하여 각 치매환자군의 위험유전자 전체점수를 비교한 결과 알쯔하이머형 치매환자군에서 점수가 더 높게 나왔으나 통계학적으로 의미있는 차이는 없었다. 결 론: 알쯔하이머형 치매환자군에서 혈관성 또는 혼재성치매치매환자군보다 ALDH2*2와 APOE*ε4 대립유전자의 빈도가 높게 나왔으나 통계학적으로 의미있는 차이는 없었다. A study on gene polymorphism of ALDH2 and APOE in patients with alzheimer's disease and vascular or mixed dementia. Objective : This study was designed to investigate gene polymorphism of ALDH2 and APOE, reported the risk factor of Alzheimer's disease, in korean dementia patients. Method : 59 Patients(male:19, female:40) with dementia, aged 65 and older in Buyeo geriatric hospital located in Buyeo-gun, chungnam, were finally included in this study. gene polymorphism of ALDH2 and APOE was typed with polymerase chain reaction in patients with Alzheimer's desease and vascular or mixed dementia. Results : 1) There was no difference in allelic frequency of ALDH2 gene polymorphism between patients with Alzheimer's disease and vascular or mixed dementia. 2) There was no difference in allelic frequency of APOE gene polymorphism between patients with Alzheimer's disease and vascular or mixed dementia. 3) Supposing APOE*ε4 and ALDH2*2 were equal risk allele of Alzheimer's disease, the sum of score by counting each risk allele was higher in patients with Alzheimer's disease than vascular mixed dementia, however there was no significant difference. Conclusion : The genotype frequency of ALDH2*(-/2) and APOE*(-/ε4) was higher in patients with Alsheimer's disease than vascular or mixed dementia, however there was no significant difference in allelic frequency of gene polymorphism of ALDH2 and APOE between patients with Alzheimer's disease and vascular or mixed dementia.

중간보강재가 설치된 직교이방성 평판의 탄성좌굴 해석

김동홍(Dong Hong Kim),채수하(Soo Ha Chae),윤순종(Soon Jong Yoon),윤종열(Chong Yul Yoon),이원복(Won Bok Lee) 한국강구조학회 1996 韓國鋼構造學會誌 Vol.8 No.2

Elastic buckling behavior of an orthotropic plate with an intermediate stiffener, placed parallel to the longitudinal axis, is investigated. Non-dimensional closed-form solution that predicts the buckling strength and the effect of ratio of plate and stiffener widths on the buckling coefficients is developed. When the orthotropic material property in this solution is replaced by an isotropic material property, the result agrees with that obtained by Bulson. Parameter study shows the buckling coefficient of the plate is linearly proportional to the ratio of plate and stiffener widths in the range between 0.2 to 0.4.

예열공정이 적용된 롤 포밍 공정에서 성형변수의 영향에 대한 분석 연구

김동홍(D. H. Kim),정동원(D. W. Jung),누웬 하 퐁(H. T. Nguyen) 한국생산제조학회 2016 한국생산제조시스템학회 학술발표대회 논문집 Vol.2016 No.04

중간보강재가 설치된 직교이방성 평판의 탄성좌굴해석

金東弘,李元福 弘益大學校 科學技術硏究所 1997 科學技術硏究論文集 Vol.8 No.-

In the study elastic buckling behavior of an orthotropic plate with intermediate stiffeners, placed parallel to the longitudinal axis, is investigated. The equations for the prediction of the buckling stress and the effect of the ratio of plate and the stiffener widths on buckling coefficients are proposed. In order to perform the buckling analysis of an orthotropic plate with an intermediate stiffener, closed form solution is used. In the case of an orthotropic plate with equally spaced intermediate stiffeners, the energy method has been used. The finite element analysis results are compared with the theoretical results to determine if the finite element analysis yields accurate results for the buckling strength of an orthotropic plate with intermediate stiffeners. The results agree with that obtained from the closed form solution. In this case, the results differ by almost four percent and when compared with the results from the energy method, they differ by twenty percent. Parameter study shows the buckling coefficient of the plate with an intermediate stiffener is linearly proportional to the ratio of the plate and stiffener width in the range between 0.2 and 0.4. The buckling coefficient of a plate with equally spaced intermediate stiffeners varies nonlinearly with the ratio of the plate to the stiffener widths.

복토기 부품 형상에 따른 진동해석

김동홍(D. H. Kim),윤대환(D. H. Yoon),Yu Hao,정동원(D. W. Jung) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.10

정읍시 지방상수도 유수율 제고 효과 분석

김동홍(Kim Dong Hong),이종세(Lee Jong Se),한상근(Han Sang Keun) 대한토목학회 2007 대한토목학회 학술대회 Vol.2007 No.10

폴대형 기상탑의 내부구조에 따른 진동해석 연구

김동홍(D.H. Kim),윤대환(D.H. Yoon),장야(Y. Zhang),정동원(D.W. Jung),이용석(Y.S. Lee) 한국생산제조학회 2015 한국생산제조시스템학회 학술발표대회 논문집 Vol.2015 No.10