시공간 정보기반 산림 생태계의 기후변화 취약성 평가

변정연 ( Jung Yeon Byun ),이우균 ( Woo Kyun Lee ),최성호 ( Sung Ho Choi ),오수현 ( Su Hyun Oh ),유성진 ( Seong Jin Yoo ),권태성 ( Tae Sung Kwon ),성주한 ( Joo Han Sung ),우재욱 ( Jae Wook Woo ) 대한원격탐사학회 2012 大韓遠隔探査學會誌 Vol.28 No.1

본 연구의 목적은 산림생태계 분포 모델인 Hy TAG모델(Hydrological and Thermal Analogy Group)과 기능 모델인 MC1 모델(MAPSS-CENTURY 1) 그리고 사회·환경적 지표를 이용하여 기후변화가 한반도 산림생태계에 미치는 영향을 파악하는 것이다. Hy TAG의 식생유형분포 변화 빈도와 방향으로부터 산림식생의 민감성과 적응성을 정량화하였다. 또한 MC1으로부터 추정되는 순일차 생산량 및 토양탄소 저장량의 변이 및 경향으로부터 산림기능의 민감성과 적응성을 정량화하였다. 사회·환경적 지표로는 재정자주도 또는 산림관련 공무원 수 등과 같은 통계자료를 포함하였다. 모든 지표들을 정규화하고 취약성 평가식에 적용하여 취약성 결과를 도출하였다. 취약성 평가의 시간적 범위는 현재(1971-2000)와 미래(2021-2050)로 구분하였다. 국가 기후변화 정책의 우선순위를 판단하기 위해 지표 별 공간 분포 지도를 작성하고 행정구역간의 취약성을 비교한 결과, 지역별로 취약성의 차이가 있는 것으로 나타났다. 이러한 취약성 차이는 적응능력에 따라 가장 크게 좌우되는 것으로 판단되었다. 본 연구의 취약성 평가 방법 및 결과는 산림 경영적 측면에서 의사결정 시스템 개발과 기후변화에 대한 적응정책 수립의 판단 자료로 활용될 것이다. The purpose of this study was to assess the vulnerability of forest ecosystem to climate change in South Korea using socio-environmental indicators and the results of two vegetation models named as Hydrological and Thermal Analogy Group (Hy TAG), and MAPSS-Century 1(MC1). The changing frequency and direction of biome types estimated by Hy TAG model was used for quantifying sensitivity and adaptive capacity of forest distribution. Similarly, the variation and changing tendency of net primary production and soil carbon storage estimated by MC1 model was used for quantifying sensitivity and adaptive capacity of forest function. As socio-environmental indicators, many statistical data such as financial autonomy rate and the number of forestry officer was prepared. All indicators were standardized, and then calculated using the vulnerability assessment equation. The period of vulnerability assessment was divided into the past(1971-2000) and the future(2021-2050). To understand what policy has a priority to climate change, distribution maps of each indicators was depicted and the vulnerability results were compared among administrative districts. Evident differences could be found in entire study area. These differences were mostly derived from regional specific adaptive capacity. The result and methodology of this study would be helpful for the development of decision-making supporting system and policy making in forest management with respect to climate change.

TiO₂ 촉매를 첨가한 자가 가습 연료전지용 MEA의 제조

변정연(Byun, Jung-Yeon),이용진(Lee, Yong-Jin),주민철(Ju, Min-Cheol),김화용(Kim, Hwa-Yong) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05

A novel self-humidifying composite membrane for the proton exchange membrane fuel cell (PEMFC) at low humidity condition was developed. The Pt/TiO₂ catalyst particles were synthesized via supercritical impregnation methods. Pt precursor was dissolved in supercritical carbon dioxide and impregnated onto TiO₂ particles. Pt precursors were platinum(II) acetylacetonate, Dimethyl(1,5-cyclooctadiene) platinum(II) and we controlled the ratio of Pt to TiO₂. The impregnated Pt precursor was converted to TiO₂ supported Pt nanoparticle under various reducing conditions. Pt/TiO₂ catalyst particles were dispersed uniformly into the Nafion solution, and then Pt/TiO₂/Nafion composite membrane was prepared using solution-cast method. The self-humidifying composite membrane could minimize membrane conductivity loss under dry conditions due to the presence of catalyst and hydrophilic Pt/TiO₂ particles. To optimize the performance of MEA, amount of ionomer loading was controlled. And mixed catalysts were used. The cell performance of MEA was obviously improved under dry conditions at 65?C.

연료전지의 자가 가습 Pt/TiO₂/Nafion 전해질막의 제조

변정연(Byun, Jung-Yeon),김효원(Kim, Hyo-Won),주민철(Ju, Min-Cheol),김화용(Kim, Hwang-Yong) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.11

A novel self-humidifying composite membrane for the proton exchange membrane fuel cell (PEMFC) at low humidity condition was developed. The Pt/TiO₂ catalyst particles were synthesized via supercritical impregnation methods. Pt precursor was dissolved in supercritical carbon dioxide and impregnated onto TiO₂ particles. Pt precursors were platinum(II) acetylacetonate, Dimethyl(1,5-cyclooctadiene) platinum(II) and we controlled the ratio of Pt to TiO₂ The impregnated Pt precursor was converted to TiO₂ supported Pt nanoparticle under various reducing conditions. TiO₂ catalyst particles were dispersed uniformly into the Nafion solution, and then Pt/TiO₂/Nafioncomposite membrane was prepared using solution-cast method. The size, dispersion and content of the platinum had been characterized with Transmission Electron Micrograph (TEM), X-ray diffract ion (XRD) and Inductively Coupled Plasma - Atomic Emission Spectrometer (ICP-AES). The cell performance with the self-humidifying composite membrane was compared with a recast Nafion membrane under both humidified and dry conditions at 65 ?C.

GIS기반 시공간정보를 이용한 건강부문의 기후변화 취약성 평가

유성진,이우균,오수현,변정연,Yoo, Seong-Jin,Lee, Woo-Kyun,Oh, Su-Hyun,Byun, Jung-Yeon 한국공간정보학회 2012 한국공간정보학회지 Vol.20 No.2

기후 변화로 인한 건강 피해를 예방하기 위해서는 지역별로 취약성 평가를 실시하고 적응대책을 수립해야 한다. 본 연구에서는 적응 대책 수립을 위한 기초 정보 제공을 목적으로 취약성 평가를 실시하였다. 건강 부문의 취약성 평가는 폭염, 오존, 매개질환 전염병의 세부 부문으로 나누어 이루어졌다. 이를 위해 각 부문별로 민감도, 적응능력, 노출 규준을 설정하고, 적합한 평가 지표를 선정하였다. 그리고 GIS를 이용하여 지표별 공간자료를 구축하고 처리하였다. 그 결과, 폭염에 의한 취약성은 남부 지방의 저지대가 중부지방에 비해 높았고, 오존에 의한 취약성은 대구분지 주변과 자동차수가 많은 수도권 및 대도시권에서 높게 나타났다. 지역 특이성이 높은 말라리아와 쯔쯔가무시증은 각각 군사분계선 근방, 남서 평야지대에서 취약성이 높게 나타났다. 또한, 미래에는 전반적으로 취약성이 증가하는 것으로 나타났으며, 남부에서 중부로 그리고 평지에서 낮은 산간지대로 취약 지역이 확대되는 경향을 보였다. 향후 관련 지표 자료의 확보와 지표별 가중치를 산정하고, 새로운 시나리오에 따른 미래 기상예측자료를 사용하면 좀 더 신뢰성 높은 취약성 평가가 가능할 것으로 생각된다. To prevent the damage to human health by climate change, vulnerability assessment should be conducted for establishment of adaptation strategies. In this study, vulnerability assessment was conducted to provide information about vulnerable area for making adaptation policy. vulnerability assessment for human health was divided into three categories; extreme heat, ozone, and epidemic disease. To assess vulnerability, suitable indicators were selected by three criteria; sensitivity, adaptive capacity, and exposure, spatial data of indicators were prepared and processed using GIS technique. As a result, high vulnerability to extreme heat was shown in the low land regions of southern part. And vulnerability to harmful ozone was high in the surrounding area of Dae-gu basin and metropolitan area with a number of automobiles. Vulnerability of malaria and tsutsugamushi disease have a region-specific property. They were high in the vicinity of the Dimilitarized zone and south-western plain, respectively. In general, vulnerability of human health was increased in the future time. Vulnerable area was extended from south to central regions and from plain to low mountainous regions. For assessing vulnerability with high accuracy, it is necessary to prepare more related indicators and consider weight of indicators and use climate prediction data based on the newly released scenario when assessing vulnerability.

논문 : 간벌강도 및 주기에 따른 동적 흉고직경 생장예측 모형개발 -기존 수확표 자료를 기반으로-

김문일 ( Moon Il Kim ),이우균 ( Woo Kyun Lee ),박태진 ( Tae Jin Park ),곽한빈 ( Han Bin Kwak ),변정연 ( Jung Yeon Byun ),남기준 ( Ki Jun Nam ),이경학 ( Kyung Hak Lee ),손영모 ( Yung Mo Son ),원형규 ( Hyung Kyu Won ),이상민 ( Sang 한국임학회 2012 한국산림과학회지 Vol.101 No.2

본 연구에서는 우리나라 주요 수종을 대상으로 간벌강도 및 주기에 따른 흉고직경생장을 예측할 수 있는 동적생장모형을 개발하였다. 그동안 산림청에서 구축한 정적생장모형인 임분수확표를 이용하여 총 8개 수종에 대한 동적생장모형을 구축하였다. 간벌종류는 하층간벌을 전제로 하였으며, 간벌강도별로 간벌후의 흉고직경변화를 예측할 수 있는 함수식을 구축하였다. 또한, 임령, 지위지수 이외에도 ha당 본수를 설명변수로 하는 흉고직경여 총함수식을 유도하였다. 이와 같이 구축된수확표를 이여 모형을 이용하여 간벌강도 및 주기별로 확표를 이 다양하이여 될 수 있었다. 본 연구를 통해 개발된수확표를 용하여 모형을 이용해 숲가꾸기 등의 산림시업이 산림용하 및 임목축분수변화에 미치는 효과를 파악할 수 있으며, 나아이산림의 탄소흡수능력을 평가하는데 본 연구결과가 유용하게 활용될 수 있을 것이다. The objective of this study was developing dynamic stand growth model to predict diameter at breast height (DBH) growth by thinning intensity and cycle for major tree species of South Korea. The yield table, one of static stand growth models, constructed by Korea Forest Service was employed to prepare dynamic stand growth models for 8 tree species. In the process of model development, the thinning type was designated to thinning from below and equations for predicting the DBH change after thinning by different intensities was generated. In addition, stand density (N/ha), age and site index were adopted as explanatory variables for DBH prediction model. Thereafter, using the model, DBH growth under various silvicuture through integrating such equations considering thinning intensities, and cycles, The dynamic stand growth model of DBH developed in this study can provide understanding of effectiveness in forest growth and growing stock when thinning practice is performed in forest, Furthermore, results of this study is also applicable to quantitatively assess the carbon storage sequestration capability.