天然闊葉樹林內 主要 構成 樹種의 天然更新 樣相

金知洪,梁熙文,金光澤,李元燮,姜聲基 강원대학교 삼림과학연구소 2001 Journal of Forest Science Vol.17 No.-

이 연구는 "국유림 경영 현대화 산학 협동 실연 연구"의 일환으로 강원도 평창군 가리왕산 일대 천연활엽수림을 대상으로, 주요 수종별 천연갱신 특성을 평가하여 연구대상 산림의 전반적인 천연갱신에 대한 종합적인 생태적 정보를 제공하고자 실시되었다. 수종별 천연갱신 특성을 요약하면 다음과 같다. 거제수나무 : 비산되는 종자이므로 종자 공급에는 문제가 없으나, 종자 발아를 위해서 노출된 광물질토양이 필요하며, 두꺼운 낙엽층은 종자 발아를 제한한다. 발아 후 갱신치수는 다량의 광선을 필요로 한다. 고로쇠나무 : 내음성은 강하나, 치수의 내건성이 약하므로 50% 이상의 피음을 요구하며, 우량 형질의 임목 조성을 위해 높은 초기 밀도를 유지하여야 한다. 맹아정신력은 높다. 난티나무 : 수분 요구도가 높고 내음성이 약하므로 60% 가량의 상층 울폐도를 유지하여 보습과 광선유입이 원활하여야 하며, 치수 활착을 위해서 관목류 및 기타 식생으로부터 경쟁 요인을 제거한다. 들메나무 : 종자 발아를 위해 광물질 토양의 노출이 필수적이며, 치수 활착을 위해서 다량의 수분과 광선이 요구되고, 지피식생에 의한 치수의 피압이 우려되므로 임지정리작업 도입이 필수적이다. 물푸레나무 : 종자 결실의 풍흉이 심하며, 두꺼운 낙엽층은 종자발아를 제한한다. 치수 활착시 지피식생에 의한 피압이 우려되므로 임지정리작업의 도입이 필수적이다. 신갈나무 종자공급의 문제(설치류에 의한 피해) 및 두꺼운 낙엽층 및 조릿대 밀생 지역에서는 종자발아가 제한되며, 치수 발생 후, 임관의 50% 이상을 열어줄 필요가 있고, 맹아갱신력이 높다. 음나무 : 두꺼운 낙엽층은 종자발아를 제한하며, 유령목 생육에 다량의 광선이 요구된다. 젓나무 : 내음성은 강하나, 유령목 단계에서 생육은 극히 저조하다. 층층나무 : 동물에 의해서 종자가 산포되지만 종자 피해는 불가피하며, 발아와 치수 활착을 위해서 단량의 광선이 요구된다. 피나무 : 종자 충실률이 낮고 이중 휴면성 때문에 종자 공급에 어려움이 있으며, 두꺼운 낙엽층은 종자발아의 걸림이 되므로 광물질 토양이 필요하고, 맹아갱신력이 매우 높다. Forming a part of "Cooperative Practical Study for the Modernization of the Management of National Forest", this study was conducted to provide overall ecological information for the natural regeneration of major tree species on the basis of community structural attributes in the deciduous forest ecosystem. Followings are summarized characteristics of the natural regeneration for the selected tree species. Betula costata : Although large number of seeds are dispersed by wind, they require mineral soils to germinate. Thick litter layer could be an obstacle to germinate. After germination, the seedling requires large amount of light for successful establishment. Acer mono : Characterized by high shade tolerance and weak drought resistance, the seedling should be overcasted with more than 50% of canopy coverage. High stand density should be maintained to produce good quality of timber. The potential of coppice may be high. Ulmus laciniata : Since this species needs high rate of troll moisture and light, around 60% of canopy coverage should be maintained to retain moisture and incoming light. The competition with other vegetation should be removed for the favor of successful seedling establishment. Fraxinus mandshurica : This species requires moist mineral soils to germinate. After germination, the seedling needs large amount of light and moisture for successful establishment. Site preparation should be applied to reduce competition with weedy vegetation. Fraxinus rhynchophylla : Interval of large seed crops may be highly varied. Thick litter layer could be an obstacle to germinate. Site preparation should be applied to reduce competition with weedy vegetation so as to achieve successful seedling establishment Quercus mongolica : Including the difficulty of seed supply by the consumption, thick litter layer and mountain bamboo cover could be the obstacle to germinate. More than 50% of relative light intensity is necessary to achieve successful seedling establishment. Kalopanax pictus : Thick litter layer could be an obstacle to germinate. The seedling needs large amount of light and moisture for successful establishment. Abies holophylla : In spite of high shade tolerance, the growth rate in sapling stage may be extremely slow. Cornus controversa : Seeds (drups) are consumed and dispersed by animals, tending to be not sufficient in seed supply. This species requires large amount of light for successful germination and seedling establishment. Tilia amurensis : The difficulty of seed supply might be expected with low seed purity and double dormancy. Since thick litter layer could be an obstacle to germinate, the species requires moist mineral soils for successful germination. The potential of coppice may be extremely high. Key words : natural deciduous forest, natural regeneration microtopography

點鳳山一帶 天然闊葉樹林의 地形的 位置에 따른 群集 構造的 屬性 分析(Ⅰ) : 樹種構性, 種多樣性, 生活型을 中心으로

姜聲基,金知洪,金光澤,梁熙文 강원대학교 삼림과학연구소 2000 Journal of Forest Science Vol.16 No.-

이 연구는 점봉산 일대 천연활엽수림을 대상으로 산림의 지형적 위치에 따라 군집의 구조적 속성이 달라진다는 가정하에 대상산림을 계곡, 산복, 능선으로 구분하고 각 군집별 수종구성, 종다양성, 생활형 분석을 통해 산림 생태계의 군집 속성을 파악하여 산림경영의 생태적 접근 방안을 위한 기초자료를 제공하고자 실시 되었다. 연구 결과, 계곡지역 상층의 수종구성은 신갈나무, 전나무, 들메나무 순으로 우점하고 있는 것으로 나타났고, 산복지역에서는 피나무, 신갈나무, 가래나무 순으로 나타났으며, 능선지역에서는 신갈나무, 피나무, 물푸레나무 순으로 나타났다. 그러나 중층과 하층에서 높은 우점률을 보이는 까치박달과 당단풍은 생육특성상 상층목으로의 도약을 기대하기 어려울 것으로 추정되었다. 종다양성은 계곡, 산복, 능선등 모든 지역의 중층과 하층에서는 유사한 것으로 파악되었으나, 상층에서는 능선지역이 계곡과 산복지역에 비해 매우 낮게 나타났다. 그리고 수분조건이 좋은 계곡보다 산복지역이 종다양성이 높은 것으로 파악되었다. 조사된 146종의 관속식물을 대상으로 생활형을 휴면형을 기준으로 구분한 결과, 지중식물, 교목, 반지중식물, 아교목, 관목, 1년생식물, 지표식물, 수생식물 순으로 나타났다. 특히 희귀 및 멸종식물로 지정된 금강초롱꽃은 본 연구 대상지 전역에서 쉽게 관찰되었다. Taking account of the structural variation on species composition according to the different topographic positions, i.e. valley, mid-slope, and ridge, the species composition, species diversity, life tool·m were comparatively analyzed fort· the three topographic positions in the natural deciduous forest of Mt. Chumbong area. The results are as follows. 1.Specise Composition : Dominant species in the overstory were Quercus mongolica. Abies holophylla, and Fraxinus mandshurica in valley ; Tilia amuresis, Quercus mongolica, and Juglans mandshurica in mid-slope ; and Quercus mongolica, Tilia amurensis, and Fraxinus rhynchophylla in ridge. Acer p. and Carpinus c. which have maintained high composition ratio in mid-story were not considered to be dominant overstory species due to inherent growth form. 2.Species Diversity : The species diversity indices of mid- and understory showed not much different value in three topographic positions. However, the index of overstory in ridge had smaller value than those of valley and mid-slope. The stand in ridge had greater species diversity index than in valley where moisture condition could be more favorable. 3.Life Form : The total of 146 vascular were observed in Mt. Chumbong in this study Especially, Hanabusaya asiatica Nakai, were supposed to be the rare and endangered species, was easily found in many places. The proportion of life form spectra in the study forest was G-MM-H-N-Th-Ch-HH. Key words : natural deciduous forest, species composition, species diversity, life form.

Improved LMI Conditions for H∞ Output Feedback Stabilization of Linear Discrete-time Systems

Guang-Hong Yang,Xin Du 제어·로봇·시스템학회 2010 International Journal of Control, Automation, and Vol.8 No.1

The problem of H∞ output feedback control for discrete-time systems is investigated in this paper. The main contribution is to provide a uniform framework for generating sufficient linear matrix inequality conditions. Those conditions are classified into two parallel parts based on the way of slack variable selection. Moreover, it is shown that the existing result is a special case of the new conditions by taking few of the additional free matrix parameters to be zero. This directly leads to more flexibility and less conservativeness in the H∞ output feedback control design. Numerical examples are carried out for illustration.

In-situ temperature sensor"s fabrication and CFD Analysis of PEM unit Fuel Cell

Hong-yang Wang(왕홍양),Woo-Joo Yang(양우주),Guang-yong Li(이광용),Young-Bae Kim(김영배) 한국정밀공학회 2013 한국정밀공학회 학술발표대회 논문집 Vol.2013 No.5월

Static Output Feedback for Discrete-time Switched Linear Systems under Arbitrary Switching

Guang-Hong Yang,Da-Wei Ding 제어·로봇·시스템학회 2010 International Journal of Control, Automation, and Vol.8 No.2

This paper considers the problem of static output feedback (SOF) control for discrete-time switched linear systems under arbitrary switching. By the aid of switched quadratic Lyapunov functions combined with Finsler’s lemma, new sufficient conditions for SOF stabilization are obtained which guarantee a r-performance of the closed-loop switched systems subject to input disturbances. The proposed method can work successfully in situations where the existing ones fail. Three examples are given to illustrate its effectiveness.

rs10505474 and rs7837328 at 8q24 Cumulatively Confer Risk of Prostate Cancer in Northern Han Chinese

Zhang, Lin-Lin,Sun, Liang,Zhu, Xiao-Quan,Xu, Yong,Yang, Kuo,Yang, Fan,Yang, Yi-Ge,Chen, Guo-Qiang,Fu, Ji-Cheng,Zheng, Chen-Guang,Li, Ying,Mu, Xiao-Qiu,Shi, Xiao-Hong,Zhao, Fan,Wang, Fei,Yang, Ze,Wang, Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.7

Aims: Genome-wide association studies (GWAS) have identified several risk variants for prostate cancer (pCa) mainly in Europeans, which need to be further verified in other racial groups. We selected six previously identified variants as candidates and to define the association with PCa in Northern Han Chinese. Methods: 749 subjects from Beijing and Tianjin in Northern China were included. Six variants (rs10505474, rs7837328, rs4242384, rs7813, rs486907 and rs1058205) were genotyped by high resolution melting (HRM) assays. The individual and cumulative contribution for of the risk of PCa and clinical covariates were analyzed. Results: Among the six candidate variants, onlyrs10505474, and rs7837328, both locating at 8q24 region, were associated with PCa in our population.rs10505474 (A) was associated with PCa ($OR_{recessive}=1.56$, p=0.006); and rs7837328 (A) was associated with PCa ($OR_{dominant}=1.38$, p=0.042/$OR_{recessive}=1.99$, p=0.003). Moreover, we observed a cumulative effects between them ($p_{trend}=2.58{\times}10^{-5}$). The joint population attributable risk showed the two variants might account for 71.85% of PCa risk. In addition, we found the homozygotes of rs10505474 (A) and rs7837328 (A) were associated with PCa clinical covariants (age at onset, tumor stage, respectively) ($p_{age}=0.046$, $P_{tumorstage}=0.048$). Conclusion: rs10505474 (A) and rs7387328 (A) at 8q24 are associated with PCa and cumulatively confer risk, suggesting the two variations could determine susceptibility to PCa in the Northern Chinese Han population.

Flexible Hybrid Energy Cell for Simultaneously Harvesting Thermal, Mechanical, and Solar Energies

Yang, Ya,Zhang, Hulin,Zhu, Guang,Lee, Sangmin,Lin, Zong-Hong,Wang, Zhong Lin American Chemical Society 2013 ACS NANO Vol.7 No.1

<P>We report the first flexible hybrid energy cell that is capable of simultaneously or individually harvesting thermal, mechanical, and solar energies to power some electronic devices. For having both the pyroelectric and piezoelectric properties, a polarized poly(vinylidene fluoride) (PVDF) film-based nanogenerator (NG) was used to harvest thermal and mechanical energies. Using aligned ZnO nanowire arrays grown on the flexible polyester (PET) substrate, a ZnO–poly(3-hexylthiophene) (P3HT) heterojunction solar cell was designed for harvesting solar energy. By integrating the NGs and the solar cells, a hybrid energy cell was fabricated to simultaneously harvest three different types of energies. With the use of a Li-ion battery as the energy storage, the harvested energy can drive four red light-emitting diodes (LEDs).</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2013/ancac3.2013.7.issue-1/nn305247x/production/images/medium/nn-2012-05247x_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn305247x'>ACS Electronic Supporting Info</A></P>

Metaproteomics based hazardous monitoring and assessment during asian dust (yellow sand) bioaerosol exposures in East Asia

( Yang-hoon Kim ),( Jae-min Park ),( Chun-sang Hong ),( Fumihisa Kobayashi ),( Yasunobu Iwasaka ),( Guang-yu Shi ) 한국폐기물자원순환학회 2023 I-CIPEC Vol.2012 No.0

Structures, biomimetic synthesis, and anti-SARS-CoV-2 activity of two pairs of enantiomeric phenylpropanoid-conjugated protoberberine alkaloids from the rhizomes of Corydalis decumbens

Jing-Guang Lu,Yingwei Wang,Ming-Rong Yang,Cai-Yun Wang,Jieru Meng,Jiazheng Liu,Zifeng Yang,Kongsong Wu,Li-Ping Bai,Guo-Yuan Zhu,Zhi-Hong Jiang 대한약학회 2022 Archives of Pharmacal Research Vol.45 No.9

(±)-Decumicorine A ( 1 ) and (±)- epi -decumicorine A ( 2 ), two pairs of enantiomeric isoquinoline alkaloids featuring a novel phenylpropanoid-conjugated protoberberine skeleton, were isolated and purifi ed from the rhizomes of Corydalis decumbens . The separation of (±)- 1 and (±)- 2 was achieved by chiral HPLC to produce four optically pure enantiomers. The structures and absolute confi gurations of compounds (−)- 1 , (+)- 1 , (−)- 2 , and (+)- 2 were elucidated by spectroscopic analysis, ECD calculations, and X-ray crystallographic analyses. The two racemates were generated from a Diels-Alder [4 + 2] cycloaddition between jatrorrhizine and ferulic acid in the proposed biosynthetic pathways, which were fully verifi ed by a biomimetic synthesis. Moreover, compound (+)- 1 exhibited an antiviral entry eff ect on SARS-CoV-2 pseudovirus by blocking spike binding to the ACE2 receptor on HEK-293T-ACE2 h host cells.

Correlation between Non-Alcoholic Fatty Liver Disease and Visceral Adipose Tissue in Non-Obese Chinese Adults: A CT Evaluation

Ai-Hong Yu,Yang-Yang Duan-Mu,Yong Zhang,Ling Wang,Zhe Guo,Yong-Qiang Yu,Yu-Sheng Wang,Xiao-Guang Cheng 대한영상의학회 2018 Korean Journal of Radiology Vol.19 No.5

Objective: To investigate the correlation between non-alcoholic fatty liver disease and visceral adipose tissue in non-obese Chinese adults using computed tomography (CT). Materials and Methods: The study included 454 subjects undergoing abdominal CT scan. Degree of CT attenuation in liver and spleen, and the degree of fat infiltration in liver were evaluated according to three indices: the attenuation value of liver parenchyma (CTLP), the attenuation ratio of liver and spleen (LSratio) and the attenuation difference between liver and spleen (LSdif). Visceral fat area (VFA) and total fat area (TFA) at L2/3 and L4/5 levels were measured, and the abdominal subcutaneous fat area (SFA) was calculated. Bivariate correlation analysis was carried out to determine the correlation among these factors. Results: In men, VFA, SFA and TFA at L2/3 and L4/5 levels showed significant differences in terms of the three indices to distinguish fatty liver from non-fatty liver (all, p < 0.001). In men, all the three indices showed negative correlation with TFA, SFA and VFA (all, p < 0.001). The negative correlation between the three indices and VFA at the L2/3 level was higher than at L4/5 level (r = -0.476 vs. r = -0.340 for CTLP, r = -0.502 vs. r = -0.413 for LSratio, r = -0.543 vs. r = -0.422 for LSdif, p < 0.001, respectively). The negative correlation between LSratio, LSdif and VFA at L2/3 and L4/5 levels was higher than SFA at the corresponding level. In women, all the three indices showed negative correlation with VFA and TFA at L2/3 and L4/5 levels, and the negative correlation between CTLP and VFA was higher at L2/3 level than at L4/5 level (r = -0.294 vs. r = -0.254, p < 0.001). Conclusion: In non-obese Chinese adults, the degree of hepatic fatty infiltration showed a strong correlation with abdominal fat on CT. VFA at L2/3 level was more closely related to fatty liver compared with VFA at L4/5 level.