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Spin-coating 공정에 의해 제조된 음극 지지형 고체산화물 연료전지
유지행,이희락,우상국,Yu, Ji-Haeng,Lee, Hee-Lak,Woo, Sang-Kuk 한국세라믹학회 2007 한국세라믹학회지 Vol.44 No.12
NiO-YSZ anode-supported single cell was prepared by spin-coating YSZ and LSM slurries as electrolyte and cathode, respectively. Dense YSZ electrolyte film was successfully prepared on the porous NiO-YSZ anode substrate by tuning pre-sintering temperature of NiO-YSZ and co-firing temperature. The thickness of YSZ film was controlled by the solid content of slurry and coating cycles. The experimental conditions affecting on the thickness of YSZ film was discussed. Single cells with the active electrode area ${\sim}0.8\;cm^2$ were prepared by spin-coating the cathode layers of LSM-YSZ mixture and LSM consequently as well. The effects of the pre-sintering temperature and thus the microstructure of NiO-YSZ substrate on the current-voltage characteristics of co-fired cell were investigated.
수생태계 건강성 통합정보 분석을 위한 GIS DB 구축 및 활용에 관한 연구
조명희 ( Myung Hee Jo ),이수형 ( Su Hyung Lee ),최희락 ( Hee Lak Choi ),장성현 ( Sung Hyun Jang ) 한국지리정보학회 2013 한국지리정보학회지 Vol.16 No.4
본 연구는 수생태계 건강성 변화에 대한 다각적인 분석이 가능하도록 정보를 제공하는데 필요한 자료를 수집하고, 상호 연계 또는 중첩, 활용할 수 있는 데이터베이스를 구축하는 방안을 모색하는데 목적이 있다. 특히 수생태계 건강성 정보를 기반으로 생태계를 구성하고 있는 개체 또는 개체군들 간의 상호작용 및 생태계 차원에서 일어나는 여러 가지 생태현상들을 그 지역의 환경변화(오염발생원, 수변환경 변화 등)와 결부시킨 종합적인 분석이 가능한 DB를 구축하고자 하였다. 이를 위해 수생태계 건강성 조사 및 평가 결과자료와 한국형 Reach File(KRF), 하천자연도, 물환경정보시스템 자료 등을 수집하였다. 수집된 수생태계 건강성 조사 결과 및 한국형 Reach File, 하천자연도 등은 자료 DB 개별속성에 대해 상세 분석을 수행하였으며, 수집데이터의 형식이 다양하게 구성되어 있어 데이터형식별 구성현황 및 상세 데이터 내에 대해 조사 및 분류별 정리를 수행하였다. 본 연구에서는 개별데이터에 대한 핵심주제를 도출하였으며, 주제별 특성과 관련된 항목정보들을 추출하여 주제별로 분류 관련 엔터티를 도출하였다. 또한, 개별 주제별 엔터티간 연계를 위한 관계값을 가진 엔터티도 도출하였다. 본 연구에서는 수생태계 건강성 결과 자료의 효율적인 분석 및 보전, 복원을 위한 방안 제시를 위해 수생태계 건강성 조사 및 평가, 한국형 Reach File, 하천자연도 등의 자료를 이용하여 공간·속성·위상 데이터를 구축하였으며, 이를 기반으로 각 자료의 연계성을 분석하여 정확하고 과학적인 수생태계의 건강성 통합정보 분석방안을 개발하고자 하였다. The purpose of this study is to build a GIS database that can utilized to provide a multi-dimensional analysis of aquatic health ecosystem. Especially, it was to build a GIS database for comprehensive analysis using the aquatic ecosystem health. So we collected data on aquatic ecosystem health assessment, Korea Reach File(KRF), Stream Naturalness and Water Environmental Information System, and detailed analysis of the collected data was performed. In addition, the core objects were extracted from individual data and a related entity was derived by pulling out the items associated with thematic characteristics and classifying them. The establishment of GIS database makes it possible to support the decision making for the user to quickly understand the information of water environment. Therefore, the database will provide the information for the effective management on water environment.
한강 및 낙동강 수계 주요 하천을 중심으로 어류를 이용한 수생태 건강성 평가
노성유 ( Seong Yu Noh ),최희락 ( Hee Lak Choi ),박종영 ( Jong Young Park ),황순진 ( Soon Jin Hwang ),김상훈 ( Sang Hun Kim ),이재안 ( Jae An Lee ) 한국물환경학회 2015 한국물환경학회지 Vol.31 No.3
The present study was carried out to develop biological criteria for aquatic ecosystem health assessment using composition and diversity of collected species. The sampling sites were a total of 67 sites in the Han River (29 sites) and the Nakdong River (38 sites), May and September 2012. During the survey period fish were collected totally 93 species. In each water system, 73 and 61 species were collected in the Han River and the Nakdong River respectively. The current composition of fish species between the Han River and Nakdong River showed similar pattern. The dominant species was Zacco platypus of the Han River, and the Nakdong River was Opsariichthys uncirostris. In particular, ecological characteristics of O. uncirostris frequently appeared in general polluted waters. In conclusion, in the Nakdong River, average value of FAI (Fish Assessment Index) was averaged 41.3, indicating a “poor condition”, and the Han River was 53.1, indicating a “poor condition”. The aquatic health of the Nakdong River assessed based on FAI was considered to be worse than that of the Han River.
연구논문 : 소옥천유역 토양유실 우심지역 선정 및 대책에 관한 연구
정동환 ( Dong Hwan Jeong ),김해정 ( Hae Jung Kim ),이영준 ( Young Joon Lee ),홍선화 ( Sun Hwa Hong ),윤조희 ( Jo Hee Yoon ),최희락 ( Hee Lak Choi ),조홍래 ( Hong Lae Cho ) 한국환경영향평가학회 2012 환경영향평가 Vol.21 No.5
This study aims to find out critical areas of a soil loss and propose feasible measures to reduce the water quality deterioration by a soil lose. As a study area, the So-ok stream catchment locating at the upper area of Daecheong Reservoir is selected and intensive field observation was carried out. RUSLE model is applied to assess the impact of the pollution migration by a soil ross from the critical areas during storms on the water quality of Chusori embayment. As results, total amount of the soil ross assessed against to the critical area on which major type of land use is a orchard for fruits is 54.3 ton/ha/yr and that of an abandoned mine site is about 200 ton/ha/year. In particular as effective measures, a plantation of an appropriate species of fruit trees and an application of ecologic restoration schemes are proposed against to the orchard and the abandoned mine site, respectively.