설계파고 추정에 사용한 연 최대 자료의 독립 및 분포 동질 검정

조홍연,정원무,백종대 한국해안,해양공학회 2020 한국해안해양공학회 논문집 Vol.32 No.1

A statistical test was carried out on the IID (Independently and Identically Distributed) assumption of the AM (Annual Maxima) data used to estimate the design wave height. The test was divided into independence (randomness) test and homogeneity test, and each test was conducted on AM data of 210 and 310 stations in coastal and inner coastal grids in typhoon and non-typhoon (monsoon) conditions. As a result of the independence test, the rejection ratios of the test are in the range of 1.8~5.3% and 1.4~6.0% for the non-typhoon and typhoon data sets, respectively. On the other hand, in the distribution difference test of typhoon data and nontyphoon data, the same distribution hypothesis was found to be rejected in the range of 47~79% according to the test method for both coastal grid and inner coastal grid. Therefore, in estimating design wave height by extreme value analysis, the estimation process by dividing the typhoon and non-typhoon data is appropriate. 설계파고 추정에 사용한 AM 자료의 IID 가정에 대한 검정을 수행하였다. 검정은 독립 검정, 분포 차이 검정으로 구분하고, 각각의 검정은 태풍, 비태풍 조건에서의 연안 격자, 연안 내부격자 각각 210개, 310개 지점의 AM 자료 세트를 대상으로 수행하였다. 독립 검정 결과, 비태풍, 태풍 자료 세트에 대하여 각각 1.8~5.3%, 1.4~6.0% 범위의 기각 비율을 보여, 대부분의 자료가 독립 검정을 만족하는 것으로 파악되었다. 한편 태풍 자료와 비태풍 자료의 분포 차이 검정은 연안 격자와 연안 내부격자 모두 검정 방법에 따라 47~79% 범위로 동일분포 가설이 기각되는것으로 파악되었다. 따라서 극치해석에 의한 설계파고 추정에서 두 자료를 구분하여 각각 설계파고를 추정하는 과정이 적절하다.

포획된 부유물질의 입도분포를 고려한 탁도계 검교정

조홍연,김백운 한국해안해양공학회 2003 한국해안해양공학회 논문집 Vol.15 No.1

가덕도 인근 연안해역에서 채취된 해저 퇴적물과 연직방향으로 배열된 표사포획장치로부터 획득된 부유물질을 이용하여 탁도계 검교정을 수행하였다. 포획된 부유물질은 모래 함량이 약 6%인 해저 퇴적물에 비하여 주로 실트 및 점토로 조성되었으며, 해저면으로부터의 놀이가 증가함에 따라 세립화하는 경향을 보였다. 해저 퇴적물에 대한 탁도계 검교정 선형 회귀식의 기울기는 최소값으로 나타났으며, 수심별로 포획된 부유물질에 의한 선형 회귀식의 기울기는 포획 고도가 증가함(즉, 입도가 감소함)에 따라서 점진적으로 증가하였다. 이러한 결과는 해저 퇴적물에 대한 탁도계 검교정 결과로부터 부유물질 농도를 환산할 경우 과대추정의 오차가 발생되며, 본 연구해역의 경우에는 그 오차가 최대 25%까지 증가할 수 있다는 것을 보여준다. 따라서 해저 퇴적물보다는 수층에서 포획된 부유물질의 입도분포를 고려하여 보정된 검교정식을 적용하는 것이 부유물질 농도의 측정오차를 최소화하는 방법으로 사료된다. Turbidity meter calibrations were conducted using bottom sediment and suspended material collected with a vertical array of sediment traps at the coastal water off Gaduk Island. Compared to the bottom sediment comprising sand fraction of approximately 6%, trapped suspended material was composed entirely of silt and clay fractions and showed a tendency to get finer as elevation from the sea-bed increases. Slope parameter of linear regression due to bottom sediment was of minimum value and values of those due to suspended material increased gradually as the height of sediment trap increases (i.e., sediment size decreases). This result shows that turbidity meter calibration using bottom sediment can cause an overestimation error in the calculation of suspended sediment concentration and that the error can reach up to 25% in case of this study. Therefore, it is suggested that the use of a corrected calibration curve based on grain size distribution of suspended material instead of bottom sediment may reduce the measurement error of suspended sediment concentration.

마산만의 물수지 및 오염물질 수지분석

조홍연,채장원,정신택 한국수자원학회 1998 한국수자원학회 학술대회 Vol.1998 No.1

시화호.인천연안 환경자료의 오차범위 분석

조홍연 한국해양과학기술원 2008 Ocean and Polar Research Vol.30 No.2

The characteristic analysis of the estimated population parameters, i.e., standard deviation and error bound of coastal pollutant concentrations (hereafter PC, i.e., COD, TN, and TP concentrations), was carried out by using environmental data with different sampling frequency in Lake Shihwa and Incheon coastal zone. The results clearly show that standard deviation of the PC increases as its mean value increases. The error bounds of the annual mean values based on seasonally measured DO concentrations and PC data in Incheon coastal zone were estimated as ranges 2.26 mg/l, 0.68~0.86 mg/l, 0.62~0.80 mg/l, and 0.074~0.082 mg/l, respectively. In terms of annual mean of the DO concentration and PC in Lake Shihwa, the error bounds based on monthly measured data from 1997 to 2003 were also estimated as ranges 4.0 mg/l, 3.0 mg/l, 0.5~1.0 mg/l, and 0.05 mg/l, respectively. The error bound on the basis of real-time monitoring data is 7~13% only as compared to that of monthly measured data. The characteristic analysis of the estimated population parameters, i.e., standard deviation and error bound of coastal pollutant concentrations (hereafter PC, i.e., COD, TN, and TP concentrations), was carried out by using environmental data with different sampling frequency in Lake Shihwa and Incheon coastal zone. The results clearly show that standard deviation of the PC increases as its mean value increases. The error bounds of the annual mean values based on seasonally measured DO concentrations and PC data in Incheon coastal zone were estimated as ranges 2.26 mg/l, 0.68~0.86 mg/l, 0.62~0.80 mg/l, and 0.074~0.082 mg/l, respectively. In terms of annual mean of the DO concentration and PC in Lake Shihwa, the error bounds based on monthly measured data from 1997 to 2003 were also estimated as ranges 4.0 mg/l, 3.0 mg/l, 0.5~1.0 mg/l, and 0.05 mg/l, respectively. The error bound on the basis of real-time monitoring data is 7~13% only as compared to that of monthly measured data.

진해·마산만의 성충화 및 DO 농도변화

조홍연,정신택 원광대학교 공업기술개발연구소 2002 工業技術開發硏究誌 Vol.22 No.-

Water temperature, salinity, and D0 concentration were measured vertically in the Chinhae-Masan Bay over the course of 1 year. The characteristics of the stratification were analysed using the measured water temperature and salinity data. The vertical DO concentration changes were also analysed through ccnsideration of the degree of stratification and the level of sediment pollution. The results of the analyses show that the thermal stratification appears just before April and disappears after October. The salinity differences between the surface and the bottom were 3.9‰, 9.3‰, 4.3‰ in April, August, and October, respectively. The DO concentration change averaged over water depth was 2.6(mg/L) in April; 8.3(mg/L) in June; 5.9(mg/L) in August; 7.2(mg/L) in September; and 4.4(mg/L) in October. The DO concentration changes were closely related to the levels of contamination and also to the effect of the mass-transfer inhibition between the surface and bottom lavers due to the thermal and density sratification.

마리나 시설의 환경 관리 기법

조홍연,오지희 한국항해항만학회 2012 한국항해항만학회 학술대회논문집 Vol.2012 No.공동학술

환경과 공생하는 항만개발

조홍연 대한토목학회 2003 대한토목학회지 Vol.51 No.3

연안재해의 특성과 최적 방재기법

조홍연 한국방재학회 2007 한국방재학회지 Vol.7 No.2

석유화학 플랜트 EPC 사업의 진도율 산정표준의 제안

조홍연,유호선,Cho, Hong-Yeon,Yoo, Hoseon 한국플랜트학회 2011 플랜트 저널 Vol.7 No.4

In proportion to continuing growth of overseas plant market and the trend of its mega scale of the project, the importance of management is significantly emphasized for the successful execution of the project. And it is recognized that progress control is the most important management item amongst the others in the management. Progress control is importance of progress measurement for performance measurement and process control of project, but it is hardly obtainable securing the objectivity in the progress measurement since the progress measurement are being applied differently in accordance with the project conditions and the experience level of the person in charge for the progress control. This study has conducted as following to propose a standard method for progress measurement in a petrochemical plant protect. Domestic and overseas plant projects are investigated variously with the applied method of progress measurement, and the deduced problem of progress measurement. And then standard method for progress measurement of engineering, procurement, construction and commissioning has been proposed according to comparison and analysis of practices in domestic & overseas plant project, procedures for progress control in the globally reputed petrochemical client, company rules and recommendation of the expert in progress control.

湖沼水質模型의 現況과 開發方向

조홍연 한국수자원학회 1996 물과 미래(한국수자원학회지) Vol.29 No.5