열차폐코팅용 GdO_1.5-ZrO₂계 희토류 지르코네이트 세라믹스의 상형성과 열물리 특성

김선주,이원준,권창섭,이성민,오윤석,김형태,임대순,김성원,Kim, Sun-Joo,Lee, Won-Jun,Kwon, Chang-Sup,Lee, Sung-Min,Oh, Yoon-Suk,Kim, Hyung-Tae,Im, Dae-Soon,Kim, Seongwon 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.6

Gadolinium zirconate, $Gd_2Zr_2O_7$, is one of the most promising candidates for replacing yttira-stabilized zirconia (YSZ) in thermal barrier coating (TBC) applications due to its low thermal conductivity and chemical stability at high temperature. In this study, rare-earth zirconate ceramics in the $GdO_{1.5}-ZrO_2$ system with reduced gadolinia contents were fabricated via solid-state reaction as well as hot-pressing at $1800^{\circ}C$. The phase formation, microstructure, and thermo-physical properties of these oxides were examined. The potential application of $GdO_{1.5}-ZrO_2$ ceramics for TBC was also discussed.

휴경지의 웅덩이와 여울에 의한 수질정화특성

김선주,김형중,김필식,지용근,양용석,Kim, Sun-Joo,Kim, Hyung-Jung,Kim, Phil-Shik,Jee, Yong-Geun,Yang, Yong-Seok 한국농공학회 2006 한국농공학회논문집 Vol.48 No.3

Fallow paddy areas have been increased due to the import of cheap agricultural product, and the unbalance between farming cost and rice price since 1990. In domestic, rice production control that decrease paddy field area has been introduced for the control of rice demand and supply and stabilization of rice price since 2003. Because of the desire of paddy field's owner to create benefit by using paddy for other object, fallow paddy would be continuously increased. In the other aspect, many people in the world is suffering from hunger because of the shortage of food. In case of Korea, continuous drought and flood damages will be potential concern of stable food supply. From this viewpoint, the increasing fallow paddy area needs to be protected from the devastation by weed breeding for the re-cultivation. In this study, fallow paddy managed with the shallow pools and shallows was selected fur monitoring and analyzing of water quality and plant body change. As the results, the managed fallow paddy found to be effective in the purification of water quality and the control of plant growth.

농업용수 정량화를 위한 경제적 수위계측망 설계

김선주,권형중,김일정,김필식,Kim, Sun Joo,Kwon, Hyung Joong,Kim, Il Jung,Kim, Phil Shik 한국농공학회 2016 한국농공학회논문집 Vol.58 No.5

This study was to design the optimal locations of the water level monitoring to quantify the agricultural water use in irrigation area supplied from an agricultural reservoir. In most of agricultural areas without TM/TC (Tele-Monitoring and Tele-Control) or monitoring network, irrigation water have been supplied on conventional experience and agricultural reservoir have been operated based on the operating simulation results by HOMWRS (Hydrological Operation Model for Water Resources System). Therefore, this study quantified the amount of agricultural water use in an irrigation area (Musu Reservoir, Jincheon-gun) by establishing water level monitoring network and analyzed the agricultural water saving effect. According to the evaluation of the economic values for water saving effect, the saving agricultural water of 1.7 million ton was analyzed to have economic values of 0.85 million won as water for living, and 1.78 million won as water for industrial use. It is identified to secure economic feasibility of the new water monitoring network by establishing one monitoring point in the entrance, irrigation area and endpoint through the economic analysis.

유전자 알고리즘을 이용한 장·단기 유출모형의 매개변수 최적화

김선주,지용근,김필식,Kim, Sun-Joo,Jee, Yong-Geun,Kim, Phil-Shik 한국농공학회 2004 한국농공학회논문집 Vol.46 No.5

In this study, parameters of long and short term runoff model were optimized using genetic algorithm as a basic research for integrated water management in a watershed. In case of Korea where drought and flood occurr frequently, the integrated water management is necessary to minimize possible damage of drought and flood. Modified TANK model was optimized as a long term runoff model and storage-function model was optimized as a short term runoff model. Besides distinguished parameters were applied to modified TANK model for supplementing defect that the model estimates less runoff in the storm period. As a result of application, simulated long and short term runoff results showed 7% and 5% improvement compared with before optimized on the average. In case of modified TANK model using distinguished parameters, the simulated runoff after optimized showed more interrelationship than before optimized. Therefore, modified TANK model can be applied for the long term water balance as an integrated water management in a watershed. In case of storage-function model, simulated runoff in the storm period showed high interrelationship with observed one. These optimized models can be applied for the runoff analysis of watershed.

강우-유출모형의 매개변수 보정을 위한 최적화 기법의 비교분석

김선주,지용근,김필식,Kim, Sun-Joo,Jee, Yong-Geun,Kim, Phil-Shik 한국농공학회 2005 한국농공학회논문집 Vol.47 No.3

The conceptual rainfall-runoff models are used to predict complex hydrological effects of a basin. However, to obtain reliable results, there are some difficulties and problems in choosing optimum model, calibrating, and verifying the chosen model suitable for hydrological characteristics of the basin. In this study, Genetic Algorithm and SCE-UA method as global optimization methods were applied to compare the each optimization technique and to analyze the application for the rainfall-runoff models. Modified TANK model that is used to calculate outflow for watershed management and reservoir operation etc. was optimized as a long term rainfall-runoff model. And storage-function model that is used to predict real-time flood using historical data was optimized as a short term rainfall-runoff model. The optimized models were applied to simulate runoff on Pyeongchang-river watershed and Bocheong-stream watershed in 2001 and 2002. In the historical data study, the Genetic Algorithm and the SCE-UA method showed consistently good results considering statistical values compared with observed data.

기간별 저수 관리를 통한 소규모 댐의 밭 관개용수 확보

김선주,이주용,김필식,Kim, Sun-Joo,Lee, Joo-Yong,Kim, Phil-Shik 한국농공학회 2005 한국농공학회논문집 Vol.47 No.2

The objective of this study is securement of upland irrigation water using storage level management of small dams. However, it is not new development of water resources but securement of water using storage level management of existing dam. This study has enhanced the water utilization coefficient of dam, after extra available water had been calculated by application of periodical management storage level and this water is used to other water like the upland irrigation water demand. As the result of application, it can secure extra available water except the water requirement. Minimum extra available water except flood is about $20,000,000\;m^3$ and crop irrigation water demand of 10yr frequency is about $2,033,000\;m^3$ in Seongju. The utilization of crop irrigation water can be possible. And extra available water is about $3,102,000\;m^3$ in 2000, $1,959,000\;m^3$ in 2001 except flood period and crop irrigation water demand of 10yr frequency is about $2,272,000\;m^3$ in Donghwa. It is judged that extra available water cannot be used to crop irrigation water during the dry season in Dongwha. Consequently, when management storage level is determined and more efficient use of water is gotten like this study, water utilization coefficient will be enhanced.

당뇨관리: 춘곤증처럼 나른하고 피곤한 당뇨인 피로, 혈당관리하면 사라져

김선주,Kim, Seon-Ju 사단법인 한국당뇨협회 2011 당뇨 Vol.258 No.-

스멀스멀 아지랑이 피듯 나른한 오월, 몸이 피곤하고 의욕이 없는 증상은 누구나 한 번쯤 겪어 보았을 것이다. 일반적으로 과로에 의한 피로는 충분한 휴식과 영양을 공급해주면 회복된다. 그러나 휴식을 취해도 호전되지 않고 피로가 6개월 이상 지속된다면 '만성피로'로 의사의 진찰을 받아보아야 한다. 왜냐하면, 피로의 원인이 당뇨, 암, 갑상선질환, 고혈압, 우울증 등에 있을 수 있기 때문이다. 실제로 원인 모를 피곤함으로 병원을 찾은 환자 중 종종 당뇨 진단을 받기도 한다. 그러면 당뇨병환자는 왜 기력이 떨어지고 피곤해하는지 당뇨와 피로의 상관관계에 대해 알아보도록 하자.

당뇨강좌 : 오래된 역사를 자랑하는 국립중앙의료원 당뇨교실

김선주,Kim, Seon-Ju 사단법인 한국당뇨협회 2011 당뇨 Vol.261 No.-

82년 국내 종합병원 중 처음으로 '당뇨교실'을 연 국랍중앙의료원 당뇨병센터는 당뇨병에 대한 기초적 지식을 당뇨전문의가 강의하고, 환자의 자가관리, 식이요법에 대해 간호사와 영양사가 돌아가며 무료로 교육하고 있다. 이곳에서 교육받은 환자가 총 40여만명에 육박할 정도로 많은 당뇨병환자들이 국립중앙의료원의 당뇨교실을 거쳐 갔다.

마산만에서 와편모류 Dinophysis acuminata 및 Oxyphysis oxytoxoides와 먹이생물 섬모류인 Mesodinium rubrum의 단주기적 개체군 변동

김선주,윤지혜,김미란,박명길,KIM, SUNJU,YOON, JIHAE,KIM, MIRAN,PARK, MYUNG GIL 한국해양학회 2015 바다 Vol.20 No.3

실내 배양체를 이용한 최근의 연구들은 혼합영양성 와편모류 Dinophysis와 종속영양성 와편모류 Oxyphysis oxytoxoides가 둘 다 혼합영양성 섬모류인 Mesodinium rubrum을 먹이생물로 이용하여 잘 성장한다는 점을 보고한 바 있다. 본 연구는 자연 생태계에서 포식자인 D. acuminata 및 O. oxytoxoides와 그들의 먹이인 M. rubrum사이의 상호작용을 연구할 목적으로 2011년 7월말부터 8월말까지 한 달간에 걸쳐 마산만의 한 고정 정점에서 하루 2회씩 개체군 변동을 모니터링 하였다. 본 연구동안 염분은 강수량이 높게 나타난 시기에 최소 5까지 급격하게 낮아지다가 강수량이 감소하는 8월말로 갈수록 약 28까지 점차적으로 증가하는 경향을 나타냈고, 수온은 8월 20일까지는 평균적으로 $26.5^{\circ}C$를 유지하였으나, 이후에는 평균 $21^{\circ}C$를 유지하였다. M. rubrum은 연구기간 동안 지속적으로 출현하였으나 그 변동 폭($13-492\;cells\;mL^{-1}$)이 매우 컸다. D. acuminata와 O. oxytoxoides의 개체수는 각각 $n.d.-19,833\;cells\;L^{-1}$와 $n.d.-100,333\;cells\;L^{-1}$의 범위를 나타냈다. 전반적으로 D. acuminata와 먹이생물인 M. rubrum의 개체수 출현 양상은 시간차를 두고 서로 밀접한 관계를 보이기도 하였으나, M. rubrum이 높은 밀도로 출현함에도 불구하고 D. acuminata의 대번식이 일어나지 않는 경우가 존재하였는데, 이러한 이유는 극심한 염분의 변화 및 포식 등의 결과로 판단된다. 한편, O. oxytoxoides는 M. rubrum이 지속적으로 출현함에도 불구하고 $19-24^{\circ}C$의 수온 범위에서만 출현한 결과로 볼 때, 먹이생물의 부족보다는 수온 등의 환경요인이 O. oxytoxoides의 밀도 변화에 큰 영향을 미쳤을 것으로 판단된다. Recent laboratory studies have documented that mixotrophic dinoflagellates Dinophysis spp. and heterotrophic dinoflagellate Oxyphysis oxytoxoides share a common prey, i.e. the mixotrophic ciliate Mesodinium rubrum. Nonetheless, very little is known about the population dynamics and species interactions among these protists in natural environments. To investigate the interactions between the dinoflagellate predators and their ciliate prey in the field, we took the samples twice a day from 26 July to 28 August, 2011 at a fixed station in Masan Bay and analyzed their abundances. During this study, salinity was highly variable, ranging from 5 to 28, due to the periodic input of rainfalls to the sampling station. Water temperature was on average $26.5^{\circ}C$ until 20 August and thereafter was about $21^{\circ}C$ by the end of the sampling period. The ciliate M. rubrum occurred persistently throughout the sampling period, ranging from 13 to $492\;cells\;mL^{-1}$. Cell densities of D. acuminata and O. oxytoxoides ranged from undetectable level to $19,833\;cells\;L^{-1}$ and from undetectable level to $100,333\;cells\;L^{-1}$, respectively. The high abundance of D. acuminata mostly followed the blooming of the ciliate M. rubrum, but it often did not peak even during heavy blooms of the prey, probably due to sensitivity to large salinity fluctuation and also presumably overlapped grazing by other mixotrophic dinoflagellates. The abundance of O. oxytoxoides was detected only when water temperature was lower than $24^{\circ}C$, indicating that water temperature is an important environmental factor to control the population dynamics of the dinoflagellate species.

당뇨강좌: 당뇨병은 아는 게 힘이다! 삼성서울병원 당뇨특강

김선주,Kim, Seon-Ju 사단법인 한국당뇨협회 2011 당뇨 Vol.258 No.-

`모르는 게 약이다'라는 말이 있다. 그러나 이 말은 옛말에 불과하다. 당뇨병은 아는 만큼 효과적으로 관리할 수 있고 관리한 만큼 건강을 유지할 수 있는 병이다. 교육을 통해 올바른 치료와 혈당 관리를 한다면 평생 건강을 유지할 수 있고, 관심을 기울이지 않고 내버려둔다면 합병증이 생겨 실명하거나 발을 잘라내게 되는 무서운 질병이다. 그러나 관리를 하자니 규칙적인 운동, 정해진 양의 식사, 인슐린과 약물 복용 등 신경쓸게 한둘이 아니다. 그러므로 병원에서 실시하고 있는 교육 프로그램을 받아 올바른 당뇨관리를 실천해야 한다. 이에 삼성서울병원 당뇨병센터에서 준비한 '당뇨병성 족부 병변'과 '올바른 인슐린 주사법' 특강을 듣고 인슐린 주사법과 효과적인 발 관리를 통한 합병증 예방의 비결을 알아보았다.