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광주,전남지역 전문대학의 보건계열학과 강화추세에 대한 검토
정용태 ( Yong Tai Chung ),이효철 ( Hvo Cheol Lee ) 대한보건협회 2010 대한보건연구 Vol.36 No.1
Objectives: This study aimed to examine the strengthening trend of health-related education and the issues of major transfer among faculty members of junior colleges in Gwangju-Jeonnam area. Methods: The national statistics on education from 1999 to 2009 were reclassified to analyze the admission quota for the students and faculty members. Transfer issues were obtained through the open-structured interview of the twelve faculty members who had completed the transfer process. Results: During the period of 1999-2009, the student quota for the health-related departments increased by 26.8% in Gwangju-Jeonnam area, which doubled the nationwide increase of 13.1%. The proportion of health sectors in junior colleges has also increased from 10.4% in 1999 to 18.0% in 2009, while that of the whole country showed from 6.9% to 9.9%. Most common issues from the faculty members who completed the transfer of their majors were limitation of available time for the re-education, restriction of extramural academic activities and lack of profound knowledge toward the new discipline. Conclusions: Our study may be used as a guideline to the restructuring and reallocation of faculties in junior colleges.
정용태,최인호,송재우,Chung, Yong Tai,Choi, In Ho,Song, Jai Woo 대한토목학회 1994 대한토목학회논문집 Vol.14 No.1
평균수심을 고려하여 유도된 만곡부의 횡단면형은 횡방향 하상경사가 0.1보다 클 때 선형관계식은 내측안에서 0 혹은 부(-)수심을 갖고, 지수관계식은 횡단면의 외측안에서 과도한 수심을 갖게 되어 비정상적인 하상형을 나타내므로, 두 관계식을 이용하여 실제하천에 적용할 수 있는 식을 제시하기 위하여 외측안은 선형관계식을 내측안은 지수관계식을 적용하여 횡방향 하상형에 관한 새로운 식을 제시하였다. 또한 위상지체 및 폭-수심비의 영향을 고려한 횡방향 하상경사를 구할 수 있는 새로운 방법을 제시하였다. 본 모형을 시용하여 실험실수로 및 자연수로부터 실측자료를 분석한 결과, 제시된 식에 의하여 계산된 값은 실측값과 비교적 잘 일치하였다. When the transverse bed slope ($S_t$) in channel bend is more than 0.1, it may produce undesirable results on the bed topography of the cross section. The linear relationship for $S_t$ results in zero or negative flow depths at the shallow $S_t$de of the cross section (i.e., inner bank). The exponential relationship for $S_t$ results in excessive flow depths at the deep side of the cross section (i.e., outer bank). This problem can be solved by combining the best features of both relationships described above. From the study, the linear relationship can be applied for the deep $S_t$de of the cross section. But the exponential relationship is suitable for the shallow side. Therefore, the new relationship of $S_t$ is clarified mathematically. A new mathematical model for bed topography is developed herein which takes accounts of the phase lag and the influence of the width to depth ratio. This model is used to analyze two sets of data: one from laboratory channel and the other from natural channel. A good agreement is found between the observed and the calculated bed topography based on the analysis of two sets of data.
유로만곡부(流路彎曲部)의 곡율비(曲率比)와 곡율계수(曲率係數)에 관한 연구(硏究)
정용태,이진은,송재우,Chung, Yong Tai,Lee, Jin Eun,Song, Jai Woo 대한토목학회 1991 대한토목학회논문집 Vol.11 No.1
운동량방정식을 이용한 하천만곡부 외측제방에 작용하는 단위면적당 수류력은 흐름의 특성, 토사의 특성 및 만곡부의 기하학적 인자의 함수인 곡률계수로 표현할 수 있다. 일반적으로 곡률비가 2.0~4.1인 경우에 외측제방에 작용하는 수류력이 가장크게 나타나는데 한강하류부의 경우 곡률비가 2.0~4.0에 집중된 것은 전구간에서 제방침식을 받게될 가능성이 높을 것으로 사료되어 하천개수계획수립시 필수적으로 고려되어야 하며 철저한 호안공 등의 방법으로 보완되어야 할 것이다. 한편 곡률계수가 최대인 곡률비의 범위가 1963년의 경우 2.21~4.42이고 1981년에는 1.93~3.54이며, 인위적인 하천개 보수공사를 고려한 년간 평균유로이동률이 1967년까지 4.68m/yr이고 1981년까지는 10.48m/yr이다. Based on the momentum equation for the flow in a stream bend, the force per unit area which the flow exerts on the outer of a bend is directly proportional to a certain curvature coefficient, $C{\alpha}$. This coefficient is dependent on the ratio of bend radius(R) to flow width(W), as well as on the coefficient of dynamic bedload friction, $tan{\alpha}$. According to the results of the data analysis for the downstrream at the Han river, the range of R/w values is between 2.0 and 4.0. Exploring the variations of $C{\alpha}$ with R/w values a functional relationship which, for the known values of $tan{\alpha}$, shows maximum values of $C{\alpha}$ for R/w values between 2.21 and 4.42 in 1963, while in 1981 its values lied between 1.93 and 3.54.
노섭,정용태,송재우,Roh, Sub,Chung, Yong Tai,Song, Jai Woo 대한토목학회 1993 대한토목학회논문집 Vol.13 No.5
자연하천에 대한 합리적인 하천개수계획수립 및 유로의 유지관리면에서 반드시 규명되어야 할 유로만곡부에서의 정량적인 해석은 여러가지 접근방법이 있으며, 사행하천의 유로이동에 대한 예측은 도로, 교량 등의 위치선정과 기존하천구조물의 방재에 필수적이다. 하상계수가 큰 우리나라의 하천에 유로이동 예측모형을 적용할 때 유량은 기간별-지배유량을 고려하는 것이 타당할 것으로 사료되며, 본 연구대상 유역에 대한 침식계수, 유로이동에 대한 평균오차량, 하상세굴계수 등을 비교검토한 결과 유로이동을 지배하는 유량이 존재함을 알 수 있으며, 연구대상유역에서 유로이동에 대한 지배유량은 재현기간 4년에 해당하는 6,000CMS 이상으로 사료된다. 유로이동모형을 실측값이 있는 남한강의 연구대상유로에 적용하여 침식계수를 구하였으며, 계산된 침식계수를 이용하여 그 유로에서의 2000년에 대한 유로이동을 예측하였다. Under natural conditions, rivers do not in general take straight courses but instead take winding courses. This is known as meandering of rivers. Meandering of rivers are so complicated because of the mutual interactions between flow and movable boundaries. In quantitative information, it is important to predict the future location of a river channel(channel migration) because in selecting a bridge site or a location of a road. It may be valuable to know the future impact of a nearby river on those structures. When the prediction model of the migration of channel is used in domestic rivers with high coefficient of river regime, it is rational to use the periodical dominant discharge (PDD), which is named firstly by the author, instead of the average discharge. According to the analysis of the erosion coefficient, the mean deviation on the channel migration, and the bed scour factor, it can bring shedding light on the fact that the discharge is one of the dominant components in channel migration. In project area, the discharge that can shift the channel is slightly greater than 6,000CMS. The prediction model of the migration of channel estimated the erosion coefficient, $E_0$ by the data from the South Han River. This estimated value from the South Han River was also used to predict the migration of the South Han River in year 2000.