연안역 개발에 따른 해안과정의 변화

이중우,이상진,이호,정대득,Lee, J.W.,Lee, S.J.,Lee, H.,Jeong, D.D. 한국항해항만학회 1999 韓國港灣學會誌 Vol.13 No.1

The construction of the coastal structures and reclamation work causes the circulation reduced in the semi-closed inner water area and the unbalanced sediment budget of beach results in an alteration of beach topography. Among the various fluid motions in the nearshore zone water particle motion due to wave and wave-induced currents are the most responsible for sediment movement. Therefore it is needed to predict the effect of the environmental change because of development and so the prediction of wave transformation dose. The purpose of this study is to introduce the relation between waves wave-induced currents and sediment movement. In this study we will show numerical method using energy conservation equation involving reflection diffraction and reflection and the surfzone energy dissipation term due to wave breaking is included in the basic equation. For the wave-induced current the momentum equation was combined with radiation stresses lateral mixing and friction Various information is required in the prediction of wave-induced current depending on the prediction tool. We can predict changes in wave-induced current from the distribution of wave especially near the wave breaking zone. To evaluate these quantities we have to know the local condition of waves mean sea level and so on. The results from the wave field and wave-induced current field deformation models are used as input data of the sediment transport and bottom change model. Numerical model were established by a finite difference method then were applied to the development plan of the eastern Pusan coastal zone Yeonhwa-ri and Daebyun fishing port. We represented the result with 2-D graphics and made comparison between before and after development.

대형 수중구조물 보수를 위한 부유식 섹터케이슨

이중우,이승철,이정수,곽승규,김기담,Lee, Joong-Woo,Lee, Seung-Chul,Lee, Jung-Su,Kwak, Seung-Kyu,Kim, Ki-Dam 한국항해항만학회 2007 한국항해항만학회지 Vol.31 No.5

최근 건설구조물의 하자보수기간은 5년에서 10년으로 연장되었고 건설품질 및 유지관리에 대한 인식의 변화에 따라 교량, 댐, 항만 구조물의 수중부 은폐된 부분에 대한 유지관리를 위해 반영구적인 공법의 개발이 요구되고 있다. 본 연구에서는 지금까지 대형 강관 및 교각의 수중시공에서는 잠수부들의 기술능력부족과 수중에서의 작업조건의 까다로움 등으로 임시적인 작업이 되었던 현 실정을 고려하여 수중구조물 유지관리에 실용화 될 수 있는 공법으로 부체식 섹터케이슨을 제안하였다. 특히, 상부구조물이 수면에 가까운 경우 및 구조물간 간격이 좁은 경우 보수구간의 접근성과 교각과 같은 대형 수중구조물 유지 보수 시 드는 고비용의 문제 등으로 전체 구조체를 설치하는 대신 섹터케이슨을 개발하여 도입함으로써 비상시 이동과 장래 신속한 작업수행 및 작업수준 향상에 획기적인 역할이 기대 된다. Recently, the defect maintenance period of the new construction structure was extended from 5 years to 10 years. And according to change of realization on the quality of construction and maintenance, a development of semi-permanent method of construction is required for maintenance of blind parts of underwater structure, such as bridge, dam, harbor, etc. In this study, we proposed a floating type sector dry caisson, which is effective to the maintenance of submerged large structures. These large structures were being maintained incompletely, partly due to unskilled divers and difficult working condition. Considering the easiness of access to the maintenance area and the cost for set up the working structure, especially for the case of structure slabs close to the sea surface and harrow pile span structures, we developed and introduced a sector dry caisson instead of the full caisson structure. By doing this, it is easy to move out the caisson rapidly in emergence case. Therefore, we expect that the floating sector caisson will contribute to reduce working time and improve the quality of underwater work in future days.

한국항만의 문제점과 환경친화적 개발 방안

이중우,Lee, J. W. 한국항해항만학회 1996 韓國港灣學會誌 Vol.10 No.2

인삼알콜추출물이 쥐간 mitochondria의 산소 소모율에 미치는 영향

이중우,김인교,강두희,Lee, Joong-Woo,Kim, In-Kyo,Kang, Doo-Hee 대한생리학회 1979 대한생리학회지 Vol.13 No.1

The following results were drawn from the experiment conducted to see the effect of ginseng alcohol extract on the mitochondrial oxidation of the rat liver. 1) Mitochondrial oxygen consumption increased in the low concentration and decreased in the high concentration of ginseng alcohol extract. 2) When the mitochondria was destroyed mechanically or was swollen by low concentration of $AgNO_3$, mitochondrial oxygen consumption was inhibited in all concentration of ginseng alcohol extract. 3) Oxygen consumption of intact mitochondria increased in the low concentration but decreased in the high concentration of sodium deoxycholate. 4) Ginseng alcohol extract inhibited cytochrome oxidase activities of liver mitochondria. These results suggest that low concentration of ginseng alcohol extract activates the oxygen consumption of liver mitochondria by increasing the permeability of the mitochondrial membrane and high concentration of the extract inhibit the oxygen consumption by inhibiting the enzyme activity related to respiration.

풍성연안순환모델의 수정

이중우,신승호,김지연,양상용,Lee, J. W.,Shin, S. H.,Kim, J. Y.,Yang, S. Y. 한국항해항만학회 1995 韓國港灣學會誌 Vol.9 No.2

The wind generated circulation model describes the phenomenon based on the following physical assumptions: a) As the horizontal dimension of the flow domain is several orders of magnitude larger than vertical dimension, nearly horizontal flow is realistic. b) The time taken for circulation to develop may effect on the flow domain of the earth's rotation, the contribution of the Coriolis force. c) A flow domain of large dimension results in quite large Reynolds number and the Reynolds stresses are approximated by the turbulent mean velocity gradient. d) The circulation is forced by the shear stresses on the water surface exercised by the wind. Modification made to the depth average approximation of the convective terms and the bed shear stress terms by adopting a certain distribution of current over the depth and laboratory measurements for the bed shear expression. Modification circulation patterns, energy evolution and surface profile gave the significant differences comparing with the classical model results. The modified model results in higher free surface gradients balancing both the free surface shear and the bed shear and consequently to higher surface profiles along the coast.

겨울철 개구리 (Rana temporaria)의 $Na^{+}$이온 대사

이중우,강두희,Lee, Joong-Woo,Kang, Doo-Hee 대한생리학회 1973 대한생리학회지 Vol.7 No.1

$Na^{+}$ balance was studied in Rana temporaria, which hibenates in fresh water in the winter time. $Na^{+}$ uptake rate, skin $Na^{+}$ loss rate, urinary $Na^{+}$ loss rate and $Na^{+}-K^{+}$ adenosine triphosphatase(ATPase) were measured at two different temperatures $1{\sim}2^{\circ}C\;and\;20{\sim}24^{\circ}C$ respectively. The results obtained were as follows: 1. $Na^{+}$ uptake rates in the frog in an artificial Pond water (APW) were found to be $8.28{\pm}0.73\;and\;2.19{\pm}0.37\;{\mu}Eq/g/day\;at\;20{\sim}24^{\circ}C\;and\;1.0{\sim}2.5^{\circ}$ respectively. 2. $Na^{+}$ loss rate through the frog skin to APW were found to be $4.26{\pm}0.72\;and\;0.93{\pm}0.21\;{\mu}Eq/g/day$ at the same temperatures. 3. Mean rates of urinary $Na^{+}$ loss at $20{\sim}24^{\circ}C\;and\;3{\sim}4^{\circ}C$ were found to be $3.02{\pm}0.73\;and\;0.78{\pm}0.13\;{\mu}Eq/g/day$ respectively. 4. The activities of $Na^{+}-K^{+}$ activated ATPase of frog skin fragments were found to be $258{\pm}39.4\;and\;49.6{\pm}7.1\;{\mu}M\;Pi/g$ protein/hr at $24^{\circ}C\;and\;2^{\circ}C$ respectively. From the above results, it may be concluded that frogs can take up enough $Na^{+}$ through the skin from APW exceeding skin loss Plus urinary loss at $1{\sim}2^{\circ}C$. It is suggested that $Na^{+}$ transport across frog skin is closely related with $Na^+-K^+$ ATPase since $Q_{10}\;of\;Na^{+}$ uptake is much similar to that of the activities of $Na^{+}-K^{+}$ ATPase.

인삼 알콜 추출물이 개구리 피부를 통한 short circuit current에 미치는 영향

이중우,김희중,강두희,Lee, Joong-Woo,Kim, Hee-Joong,Kang, Doo-Hee 대한생리학회 1976 대한생리학회지 Vol.10 No.1

In an attempt to examine the effect of ginseng on sodium transport across the biological membrane, we have studied effects of ginseng alcohol extract on the short-circuit current(SCC) and the $Na^+-K^+$-activated ATPase activity in isolated frog skin preparations. 1. Ginseng alcohol extract applied to the mucosal surface of the frog skin significantly increased SCC at low concentration($1{\sim}10mg%$) but decreased SCC at higher concentration($50{\sim}250mg%$). 2. Similarly, when the drug was added to the serosal bathing medium, the SCC was stimulated at low doses($5{\sim}25mg%$) and inhibibited at high doses($50{\sim}250mg%$). 3. $Na^+-K^+$-activated ATPase activity of the frog skin epidermal homogenate was significantly inhibited by ginseng alcohol extract, the effect being proportional to the concentration of the drug in the incubation mixture. These results may suggest that a low dose of ginseng alcohol extrat enhances the transepithelial sodium transport probably by increasing the permeability of outer membrane of the transporting cell to sodium ion, whereas a high dose of drug reduces the sodium transport primarly by inhibiting $Na^+-K^+$ ATPase mediated active transport step.

대형 수중구조물 보수를 위한 부체식 섹터케이슨 개발

이중우(Joong-Woo Lee),김기담(Ki-Dam Kim),이승철(Seung-Chul Lee),김형철(Hyoung-Chul Kim),이정수(Jung-Su Lee),곽승규(Seung-Kyu Kwak) 한국항해항만학회 2007 한국항해항만학회 학술대회논문집 Vol.1 No.춘계

최근 건설구조물의 하자보수기간은 5년에서 10년으로 연장되었고 건설품질 및 유지관리에 대한 인식의 변화에 따라 교량, 댐, 항만구조물의 수중부 은폐된 부분에 대한 유지관리를 위해 반영구적인 공법의 개발이 요구되고 있다. 본 연구에서는 지금까지 대형 강관 및 교각의 수중시공에서는 잠수부들의 기술능력 부족과 수중에서의 작업조건의 까다로움 등으로 임시적인 작업이 되었던 현 실정을 고려하여 수중구조물 유지관리에 실용화 될 수 있는 공법으로 부체식 섹터케이슨을 제안하였다. 특히, 상부구조물이 수면에 가까운 경우 및 구조물간 간격이 좁은 경우 보수구간의 접근성과 교각과 같은 대형 수중구조물 유지·보수 시 드는 고비용의 문제 등으로 전체 구조체를 설치하는 대신 섹터케이슨을 개발하여 도입함으로써 비상시 이동과 장래 신속한 작업수행 및 작업수준 향상에 획기적인 역할이 기대 된다. Recently, the defect maintenance period of the new construction structure was extended from 5 years to 10 years. And according to change of realization on the quality of construction and maintenance, a development of semi-permanent method of construction is required for maintenance of blind parts of underwater structure, such as bridge, dam, harbor, etc. In this study, we proposed a floating type sector dry caisson, which is effective to the maintenance of submerged large structures. These large structures were being maintained incompletely, partly due to unskilled divers and difficult working condition. Considering the easiness of access to the maintenance area and the cost for set up the working structure, especially for the case of structure slabs close to the sea surface and harrow pile span structures, we developed and introduced a sector dry caisson instead of the full caisson structure. By doing this, it is easy to move out the caisson rapidly in emergence case. Therefore, we expect that the floating sector caisson will contribute to reduce working time and improve the quality of underwater work in future days.

대형 수중구조물 보수를 위한 부유식 섹터케이슨

이중우(Joong-Woo Lee),이승철(Seung-Chul Lee),이정수(Jung-Su Lee),곽승규(Seung-Kyu Kwak),김기담(Ki-Dam Kim) 한국항해항만학회 2007 한국항해항만학회지 Vol.31 No.05

최근 건설구조물의 하자보수기간은 5년에서 10년으로 연장되었고 건설품질 및 유지관리에 대한 인식의 변화에 따라 교량, 댐, 항만구조물의 수중부 은폐된 부분에 대한 유지관리를 위해 반영구적인 공법의 개발이 요구되고 있다. 본 연구에서는 지금까지 대형 강관 및 교각의 수중시공에서는 잠수부들의 기술능력부족과 수중에서의 작업조건의 까다로움 등으로 임시적인 작업이 되었던 현 실정을 고려하여 수중구조물 유지관리에 실용화 될 수 있는 공법으로 부체식 섹터케이슨을 제안하였다. 특히, 상부구조물이 수면에 가까운 경우 및 구조물간 간격이 좁은 경우 보수구간의 접근성과 교각과 같은 대형 수중구조물 유지.보수 시 드는 고비용의 문제 등으로 전체 구조체를 설치하는 대신 섹터케이슨을 개발하여 도입함으로써 비상시 이동과 장래 신속한 작업수행 및 작업수준 향상에 획기적인 역할이 기대된다. Recently, the defect maintenance period of the new construction structure was extended from 5 years to 10 years. And according to change of realization on the quality of construction and maintenance, a development of semi-permanent method of construction is required for maintenance of blind parts of underwater structure, such as bridge, dam, harbor, etc. In this study, we proposed a floating type sector drγ caisson, which is effective to the maintenance of submerged large structures. These large structures were being maintained incompletely, partly due to unskilled divers and difficult working condition Considering the easiness of access to the maintenance area and the cost for set up the working structure, especially for the case of structure slabs close to the sea surface and harrow pile span structures, we developed and introduced a sector dry caisson instead of the full caisson structure. By doing this, it is easy to move out the caisson rapidly in emergence case. Therefore, we expect that the floating sector caisson will contribute to reduce working time and improve the quality of underwater work in future days

철도차량에 이용되는 고효율 3상 유도전동기 설계연구 개발

이중우(Lee Joong-Woo),김광수(Kim Kwang-Soo),김원호(Kim Won-Ho),장익상(Jang Ik-Sang),이재준(Lee Jae-Joon),이주(Lee Ju) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월

In today, the energy saving in existing electrical machines used a variety of facilities is very important because the energy shortage becomes a serious social problem. Especially, electrical machines occupy a large percentage of consuming electrical energy and the three phase induction motor used in a railroad system also consume a lot of electrical energy. Therefore the design of high efficiency three phase induction motor for railroad is a essential method to satisfy aspects of enhancing performance of railroad and energy saving in railroad system. The main contents in this paper are the fundamental process of design of high efficiency three phase induction motor and selecting some design parameters to be considered in each step. The results of designed motor is analyzed by using the FEM.