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Estimation of effective plant area index for South Korean forests using LiDAR system

Science China(Life Sciences) 2010年第7期53卷 898-908页

作者： kwak doo-ahn LEE Woo-Kyun KAFATOS Menas SON Yowhan CHO Hyun-Kook LEE Seung-Ho Department of Environmental Science and Ecological Engineering Korea University Center of Excellence in Earth Observing Schmid College of ScienceChapman University Division of Forest Resources Information Korea Forest Research Institute

Light Detection and Ranging(LiDAR) systems can be used to estimate both vertical and horizontal forest *** components,the leaves of trees and the understory can be described with high precision,using geo-registered *** on this concept,the Effective Plant Area Indices(PAIe) for areas of Korean Pine(Pinus koraiensis),Japanese Larch(Larix leptolepis) and Oak(Quercus spp.) were estimated by calculating the ratio of intercepted and incident LIDAR laser rays for the canopies of the three forest ***,the canopy gap fraction(GLiDAR) was generated by extracting the LiDAR data reflected from the canopy surface,or inner canopy area,using k-means *** LiDAR-derived PAIe was then estimated by using GLIDAR with the Beer-Lambert law.A comparison of the LiDAR-derived and field-derived PAIe revealed the coefficients of determination for Korean Pine,Japanese Larch and Oak to be 0.82,0.64 and 0.59,*** differences between field-based and LIDAR-based PAIe for the different forest types were attributed to the amount of leaves and branches in the forest *** absence of leaves,in the case of both Larch and Oak,meant that the LiDAR pulses were only reflected from *** probability that the LiDAR pulses are reflected from bare branches is low as compared to the reflection from branches with a high leaf *** is because the size of the branch is smaller than the resolution across and along the 1 meter LIDAR laser ***,a better predictive accuracy would be expected for the model if the study would be repeated in late spring when the shoots and leaves of the deciduous trees begin to appear.

关键词： leaf area index plant area index LiDAR k-means clustering gap fraction beer-lambert law

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Spatio-temporal change in forest cover and carbon storage considering actual and potential forest cover in South Korea

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Science China(Life Sciences) 2015年第7期58卷 713-723页

作者： NAM Kijun LEE Woo-Kyun KIM Moonil kwak doo-ahn BYUN Woo-Hyuk YU Hangnan kwak Hanbin KWON Taesung SUNG Joohan CHUNG Dong-Jun LEE Seung-Ho Division of Environmental Science and Ecological Engineering Korea University GIS/RS Center for Environmental Resources Korea University Division of Forest Ecology Korea Forest Research Institute National Forestry Cooperative Federation Division of Forest Economics & Management Korea Forest Research Institute

This study analyzes change in carbon storage by applying forest growth models and final cutting age to actual and potential forest cover for six major tree species in South Korea. Using National Forest Inventory data, the growth models were developed to estimate mean diameter at breast height, tree height, and number of trees for Pinus densiflora, Pinus koraiensis, Pinus rigida, Larix kaernpferi, Castanea crenata and Quercus spp. stands. We assumed that actual forest cover in a forest type map will change into potential forest covers according to the Hydrological and Thermal Analogy Groups model. When actual forest cover reaches the final cutting age, forest volume and carbon storage are estimated by changed forest cover and its growth model. Forest volume between 2010 and 2110 would increase from 126.73 to 157.33 m^3 hm^-2. Our results also show that forest cover, volume, and carbon storage could abruptly change by 2060. This is attributed to the fact that most forests are presumed to reach final cutting age. To avoid such dramatic change, a regeneration and yield control scheme should be prepared and implemented in a way that ensures balance in forest practice and yield.

关键词： climate change final cutting age carbon storage national forestry inventory forest growth model

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Estimation of carbon storage based on individual tree detection in Pinus densiflora stands using a fusion of aerial photography and LiDAR data

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Science China(Life Sciences) 2010年第7期53卷 885-897页

作者： KIM So-Ra kwak doo-ahn LEE Woo-Kyun SON Yowhan BAE Sang-Won KIM Choonsig YOO Seongjin Division of Environmental Science and Ecological Engineering Korea University Forest Practice Research Center Korea Forest Research Institute Departement of Forest Resources Jinju National University

The objective of this study was to estimate the carbon storage capacity of Pinus densiflora stands using remotely sensed data by combining digital aerial photography with light detection and ranging(LiDAR) data.A digital canopy model(DCM),generated from the LiDAR data,was combined with aerial photography for segmenting crowns of individual *** eliminate errors in over and under-segmentation,the combined image was smoothed using a Gaussian filtering *** processed image was then segmented into individual trees using a marker-controlled watershed segmentation *** measuring the crown area from the segmented individual trees,the individual tree diameter at breast height(DBH) was estimated using a regression function developed from the relationship observed between the field-measured DBH and crown *** above ground biomass of individual trees could be calculated by an image-derived DBH using a regression function developed by the Korea Forest Research *** carbon storage,based on individual trees,was estimated by simple multiplication using the carbon conversion index(0.5),as suggested in guidelines from the Intergovernmental Panel on Climate *** mean carbon storage per individual tree was estimated and then compared with the field-measured *** study suggested that the biomass and carbon storage in a large forest area can be effectively estimated using aerial photographs and LiDAR data.

关键词： LiDAR aerial photograph region growing marker-control watershed segmentation carbon storage

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利用激光雷达数据估算韩国森林有效植被面积指数

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中国科学：生命科学 2010年第7期40卷 678-678页

作者： kwak doo-ahn LEE Woo-Kyun KAFATOS Menas CHO Hyun-Kook Department of Environmental Science and Ecological Engineering Korea University Seoul 136-713 Korea Center of Excellence in Earth Observing Schmid College of Science Chapman University Orange CA 92866 USA Division of Forest Resources Information Korea Forest Research Institute Seoul 136-012 Korea

雷达系统能够同时探测森林的水平结构和垂直结构,结合地面控制点还可以高精度地描绘森林中的树干、树冠及林下植被.基于此理念,通过计算雷达激光束被拦截的比例估算红松(Pinus koraiensis)、日本落叶松(Larix leptolepis)和栎类(Quercus... 详细信息

雷达系统能够同时探测森林的水平结构和垂直结构,结合地面控制点还可以高精度地描绘森林中的树干、树冠及林下植被.基于此理念,通过计算雷达激光束被拦截的比例估算红松(Pinus koraiensis)、日本落叶松(Larix leptolepis)和栎类(Quercus sp.)的有效植被面积指数(PAIe).从冠层表面或冠层内部反射的雷达数据中利用k-均值聚类方法提取林隙分数(GLIDAR),根据比尔-朗伯吸收定律和GLIDAR计算PAIe.结果显示,利用雷达数据推算的红松、日本落叶松和栎类的PAIe与实际测量的PAIe之间的相关系数分别为0.82,0.64和0.59.不同树种之间雷达测量值与实测值之间相关性的差异,主要来自于叶片与枝条数量的不同.如果没有树叶,激光雷达的脉冲只能由枝条反射,然而枝条的大小往往小于激光雷达的分辨率(1m),所以与长满树叶的枝条相比,光秃的枝条反射雷达脉冲的几率非常小.因此,若在春季末期树叶出现后进行此类研究,估算的准确度将有所提高.

关键词：叶面积指数植被面积指数激光雷达 k-均值聚类林隙比尔-朗伯吸收定律

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Fibrinogen’s potential role in connecting cerebrovascular abnormalities with glymphatic dysfunction in Alzheimer’s disease

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Neural Regeneration Research 2025年第1期20卷 203-204页

作者： Vishal Singh Arnab Choudhury Hyung Jin ahn Department of Pharmacology Physiology and NeurosciencesRutgers-New Jersey Medical SchoolNewarkNJUSA Brain Health Institute Rutgers UniversityPiscatawayNJUSA

Alzheimer’s disease(AD)stands out as the primary manifestation of age-related dementia,portraying a chronic neurodegenerative disorder distinguished by the accumulation of fibrillar amyloid-β(Aβ)plaques and neurofibrillary tangles of hyperphosphorylated ***,from a clinical standpoint,AD presents itself as a complex condition with a spectrum of dysfunctions rather than a singular pathological *** often-overlooked aspect of the disease is the presence of extensive cerebrovascular abnormalities,given that the majority of AD patients experience altered cerebral blood flow,damaged vasculature,increased microinfarcts and *** models of AD further support this observation,showing cerebrovascular dysfunction such as impaired cerebral blood flow and altered cerebrovascular reactivity(Tataryn et al.,2021;Gareau et al.,2023).

关键词： cerebrovascular dysfunction Alzheimer

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利用航空影像和雷达数据估算韩国单株个体赤松林的碳储量

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中国科学：生命科学 2010年第7期40卷 677-677页

作者： KIM So-Ra kwak doo-ahn LEE Woo-Kyun SON Yowhan BAE Sang-Won KIM Choonsig YOO Seongjin Division of Environmental Science and Ecological Engineering Korea University Seoul 136-701 Korea Forest Practice Research Center Korea Forest Research Institute Kyeonggi-Do 487-821 Korea Departement of Forest Resources Jinju National University Jinju 660-758 Korea

利用航空影像和激光雷达数据,对韩国赤松林的碳储量进行了估算.基于雷达数据建立数字冠层模型,再与航空影像融合,进而划分单株树木的冠幅范围.为消除分段误差,采用高斯滤波方法对融合后的影像进行平滑,然后利用标记控制阈值分割方法提... 详细信息

利用航空影像和激光雷达数据,对韩国赤松林的碳储量进行了估算.基于雷达数据建立数字冠层模型,再与航空影像融合,进而划分单株树木的冠幅范围.为消除分段误差,采用高斯滤波方法对融合后的影像进行平滑,然后利用标记控制阈值分割方法提取出单株树木的冠幅范围,再通过建立实测冠幅面积和胸径间的回归方程计算出单株树木的胸径.在此基础上,利用韩国森林研究所建立的回归模型,计算单株树木的地上生物量.单株树木的碳储量由地上生物量乘以转化系数(0.5)得到.结果显示,用此方法估算的平均单株树木碳储量为193.7kgC,与实际测量值223.8kgC较为接近,说明本研究提供的基于航空影像和雷达的方法,可以有效地估算大面积森林树木的生物量和碳储量.

关键词：激光雷达航空影像区域生长量标记控制阈值分割法碳储量

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Erratum to:Estimation of carbon storage based on individual tree detection in Pinus densiflora stands using a fusion of aerial photography and LiDAR data

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Science China(Life Sciences) 2010年第9期53卷 1162-1162页

In the online version of the article the name of the third author is *** correct name is LEE Woo-Kyun.

关键词： Erratum to

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Maximizing biomass utilization: An integrated strategy for coproducing multiple chemicals

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Journal of Energy Chemistry 2025年第1期100卷 180-191页

作者： Byeongchan ahn Sua Jo Jonggeol Na J.Jay Liu Young-Ju Kim Wangyun Won Department of Chemical and Biological Engineering Korea University145 Anam-roSeongbuk-guSeoul 02841Republic of Korea Department of Chemical Engineering(Integrated process) Kyung Hee University1732 Deogyeong-daeroGiheung-guYongin-siGyeonggi-do 17104Republic of Korea Department of Chemical Engineering and Materials Science Ewha Womans University52 Ewhayeodae-gilSeodaemun-guSeoul 03760Republic of Korea Department of Chemical Engineering Pukyong National University45 Yongso-roNam-guBusan 48513Republic of Korea Resources Engineering Plant Research Department Korea Institute of Geoscience and Mineral Resources124 Gwahak-ro Yuseong-guDaejeon 34132Republic of Korea

Lignocellulosic biomass is one of the viable solutions to alleviate the global warming. However, the limited utilization of biomass majorly focused on cellulose and hemicellulose restricts the economic and environmental feasibilities. To cope with this issue, we proposed an integrated process of co-producing 1,6-hexanediol(1,6-HDO) with tetrahydrofuran and adipic acid from biomass, referred to as Strategy A. To compare the impacts of lignin upgrading and feedstock, Strategy B, which co-produces tetrahydrofuran alone, and Strategy C, which is the traditional route to produce 1,6-HDO from fossil fuels, were used. Heat networks are also designed to reduce operating costs and indirect carbon emissions due to energy consumption, saving 87% and 83% of the heat and cooling requirements, respectively, in Strategy A. The market competitiveness of Strategy A was evaluated by determining the minimum selling price through techno-economic analysis, and sustainability was thoroughly investigated by quantifying the environmental impacts through both midpoint and endpoint life-cycle assessments(LCAs).Strategy A was found to be the most favorable both economically(USRDSCHARDOLLAR3,402/ton) and environmentally(-26.9 kg CO_(2)eq.). This indicates that lignin valorization is not only economically but also environmentally preferred. Finally, changes in economic and environmental feasibilities depending on economic, process, and environmental parameters were investigated using sensitivity and uncertainty analyses. The results of these analyses provide valuable insight into bio-based chemical production.

关键词： Biorefinery Carbon mitigation Climate change Global warming Lignin utilization Bioeconomy

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Prominent cycling reversibility and kinetics enabled by CaTiO_(3) protective layer on Zn metal for aqueous Zn-ion batteries

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Journal of Energy Chemistry 2025年第1期100卷 245-258页

作者： Gaeun Lee Yong Nam ahn Seongjoon So Chanwoo Park Jong-Seong Bae Taehyun Park Il Tae Kim Jaehyun Hur School of Chemical Biologicaland Battery EngineeringGachon UniversitySeongnamGyeonggi 13120Republic of Korea Busan Center Korea Basic Science InstituteBusan 46742Republic of Korea

Aqueous Zn-ion batteries (AZIBs) have received considerable attention owing to their various advantages such as safety,low cost,simple battery assembly conditions,and high ionic ***,they still suffer from serious problems,including uncontrollable dendrite growth,corrosion,hydrogen evolution reaction (HER) from water decomposition,electrode passivation,and unexpected *** creation of a uniform artificial nanocrystal layer on the Zn anode surface is a promising strategy for resolving these ***,we propose the use of a perovskite CaTiO_(3)(CTO) protective layer on Zn(CTO@Zn) as a promising approach for improving the performance of *** CTO artificial layer provides an efficient pathway for Zn ion diffusion towards the Zn metal because of the high dielectric constant (εr=180) and ferroelectric characteristics that enable the alignment of dipole moments and redistribute the Zn^(2+)ions in the CTO *** avoiding the direct contact of the Zn anode with the electrolyte solution,the uneven dendrite growth,corrosion,parasitic side reactions,and HER are mitigated,while CTO retains its mechanical and chemical robustness during ***,CTO@Zn demonstrates an improved lifespan in a symmetric cell configuration compared with bare ***@Zn shows steady overpotential (~68 m V) for 1500 h at 1 mA cm^(-2)/0.5 mA h cm^(-2),excelling bare ***,when paired with the V_(2)O_(5)-C cathode,the CTO@Zn//V_(2)O_(5)-C full battery delivers 148.4 mA h g^(-1)(based on the mass of the cathode) after 300 *** study provides new insights into Zn metal anodes and the development of high-performance AZIBs.

关键词： CaTiO_(3) Artificial layer Dielectric constant Znmetal anode Zinc aqueous battery

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Identification of patients with advanced pancreatic cancer who might benefit from third-line chemotherapy

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World Journal of Gastrointestinal Oncology 2025年第2期17卷 74-83页

作者： Bomi Kim Jaihwan Kim Soomin Yang Jinwoo ahn Kwangrok Jung Jong-Chan Lee Jin-Hyeok Hwang Department of Internal Medicine Seoul National University Bundang HospitalSeoul National University College of MedicineSeongnam 13620South Korea

BACKGROUND Survival rates of patients with advanced pancreatic cancer(APC)have been improved with palliative chemotherapy *** current preferred first-line regimen consists of combination therapy of 5-fluorouracil(5-FU)/leucovorin(LV),irinotecan,and oxaliplatin(FOLFIRINOX)or gemcitabine plus albumin-bound paclitaxel(GNP).After failure of first-line chemotherapy,there are a few options for subsequent therapy including switch to the unused first-line regimen or nanoliposomal irinotecan and 5-FU/***,there are limited studies on the efficacy of third-line chemotherapy after failure of second-line *** To identify patients with APC who might benefit from third-line *** Medical records from a single tertiary hospital were retrospectively reviewed between 2012 and *** study included patients with histologically or cytologically confirmed metastatic or locally APC who underwent first-line FOLFIRINOX or GNP and subsequently received third-line *** survival(OS)after diagnosis and OS after third-line chemotherapy(OS3)were defined as the interval from the diagnosis to all-cause death and the time between the initiation of the third-line chemotherapy to all-cause death,*** A total of 141 patients were *** median patient age at diagnosis was 61.8 years(36.0-86.0),and 54.9%were *** first-line regimen was FOLFIRINOX(67.4%)or GNP(32.6%).The second-line regimen was FOLFIRINOX(27.0%),GNP(52.5%),or other(20.6%).The median OS was 19.0 months,and the median OS3 and progression-free survival after third-line treatment were 15.3 and 7.3 weeks,*** regard to the best tumor response during third-line chemotherapy,1.4%had partial response,24.8%had stable disease,and 59.6%had progressive *** following clinical factors before third-line chemotherapy affected OS3:Good performance status(PS),serum carbohydrate antigen 19-9(CA19-9)level<1000 U/mL,duration of second-line chemotherapy≥

关键词： Pancreatic cancer Chemotherapy Survival Performance status Carbohydrate antigen 19-9

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