Search results for: Chang Seok Lee

Items from 1 to 20 out of 74 results

article

Spiral‐Driven Vertical Conductivity in Nanocrystalline Graphene

Yohan Kim, Chang‐Seok Lee, Seungwoo Son, Keun Wook Shin, more

Small > 20 > 7 > n/a - n/a

The structure of graphene grown in chemical vapor deposition (CVD) is sensitive to the growth condition, particularly the substrate. The conventional growth of high‐quality graphene via the Cu‐catalyzed cracking of hydrocarbon species has been extensively studied; however, the direct growth on noncatalytic substrates, for practical applications of graphene such as current Si technologies, remains...

article

Machine learning–assisted drift capacity prediction models for reinforced concrete columns with shape memory alloy bars

Chang Seok Lee, Sujith Mangalathu, Jong‐Su Jeon

Computer‐Aided Civil and Infrastructure Engineering > 39 > 4 > 595 - 616

Despite notable progress made in predicting the drift capacity of reinforced columns with steel bars, these techniques and methods are proven inapplicable for accurately predicting the drift capacity of RC columns reinforced with shape memory alloy (SMA) bars. This study employed machine learning (ML) to predict and design the drift limit state of concrete columns using SMA bars. To this end, a total...

article

Amorphous Carbon Films for Electronic Applications

Ik‐Soo Kim, Chae‐Eun Shim, Sang Won Kim, Chang‐Seok Lee, more

Advanced Materials > 35 > 43 > n/a - n/a

While various crystalline carbon allotropes, including graphene, have been actively investigated, amorphous carbon (a‐C) thin films have received relatively little attention. The a‐C is a disordered form of carbon bonding with a broad range of the CC bond length and bond angle. Although accurate structural analysis and theoretical approaches are still insufficient, reproducible structure–property...

article

Randomised clinical trial: Safety, tolerability, pharmacodynamics and pharmacokinetics of zastaprazan (JP‐1366), a novel potassium‐competitive acid blocker, in healthy subjects

Inyoung Hwang, Sang Chun Ji, Jaeseong Oh, Hyojin Kim, more

Alimentary Pharmacology & Therapeutics > 57 > 7 > 763 - 772

Background Zastaprazan (JP‐1366) is a novel potassium‐competitive acid blocker with favourable preclinical safety and efficacy profile being developed for the treatment of acid‐related diseases. Aims To investigate the safety, tolerability, pharmacodynamics and pharmacokinetics of zastaprazan. Methods A randomised, open‐label, placebo‐ and active‐controlled, single and multiple ascending dose...

article

Featured Cover

Inyoung Hwang, Sang Chun Ji, Jaeseong Oh, Hyojin Kim, more

Alimentary Pharmacology & Therapeutics > 57 > 7 > i - i

The cover image is based on the Original Article Randomised clinical trial: Safety, tolerability, pharmacodynamics and pharmacokinetics of zastaprazan (JP‐1366), a novel potassium‐competitive acid blocker, in healthy subjects by Inyoung Hwang et al., https://doi.org/10.1111/apt.17406

article

Probabilistic residual deformation prediction model for rectangular reinforced concrete columns

Chang Seok Lee, Jong‐Su Jeon

Earthquake Engineering & Structural Dynamics > 51 > 9 > 1994 - 2015

This paper presents a probabilistic residual deformation prediction model for estimating the nonlinear response and demolition probability of reinforced concrete structures. An empirical relation between the residual deformation and column physical parameters was formulated from experimental observations. The accuracy of the proposed model was compared to those of three deterministic models available...

article

Phenomenological hysteretic model for superelastic NiTi shape memory alloys accounting for functional degradation

Chang Seok Lee, Jong‐Su Jeon

Earthquake Engineering & Structural Dynamics > 51 > 2 > 277 - 309

This study presents a simple hysteretic model to reproduce the stress–strain relationship of superelastic NiTi shape memory alloys (SMAs). The proposed model explicitly includes the functional degradation of SMAs, which has been ignored in earthquake engineering applications. This effect causes a reduction in the transformation stress and accumulation of residual strain. Because SMA devices are mainly...

article

Adaptive hysteretic model for reinforced concrete columns including variations in axial force and shear span length

Chang Seok Lee, Jong‐Su Jeon

Earthquake Engineering & Structural Dynamics > 50 > 15 > 4001 - 4031

In this study, a hysteretic model is developed for simulating the nonlinear response of reinforced concrete columns with strength degradation behavior under cyclic loading. During analysis, the proposed model exhibits the ability to adjust the model parameters assigned to the model continually, based on the monitored element boundary conditions. A semi‐empirical relationship between model parameters...

article

Mannosylerythritol lipids inhibit melanogenesis via suppressing ERK‐CREB‐MiTF‐tyrosinase signalling in normal human melanocytes and a three‐dimensional human skin equivalent

Il‐Hong Bae, Eun Soo Lee, Jae Won Yoo, Sung Hoon Lee, more

Experimental Dermatology > 28 > 6 > 738 - 741

Hyperpigmentation is caused by excessive production of melanin in melanocytes. Mannosylerythritol lipids (MELs) are glycolipid biosurfactants that are abundantly produced by yeasts and used commercially in cosmetics. However, the potential depigmenting efficacy of MELs has not been evaluated. In this study, the depigmentary effect of MELs was tested in primary normal human melanocytes (NHMs), α‐melanocyte‐stimulating...

article

Spatial distribution of vegetation along the environmental gradient on the coastal cliff and plateau of Janggi peninsula (Homigot), southeastern Korea

Song Hie Jung, A Reum Kim, Bong Soon Lim, Jae Won Seol, more

Journal of Ecology and Environment > 2019 > 43 > 1 > 1-12

Background Cliffs are a major plant habitat around the coastal area, but in contrast to sand dunes and salt marshes, they have been little investigated in Korea. There are simple descriptions of cliff vegetation in studies on island vegetation, but there is no published paper, which addressed sea cliff vegetation synthetically. Furthermore, the coastal area where this study was carried out was designated...

article

Ameliorating effect of dipotassium glycyrrhizinate on an IL-4- and IL-13-induced atopic dermatitis-like skin-equivalent model

Sung Hoon Lee, Il-Hong Bae, Hyangtae Choi, Hyeong Won Choi, more

Archives of Dermatological Research > 2019 > 311 > 2 > 131-140

Atopic dermatitis (AD) is a chronic inflammatory skin disease that is not fully understood. Defects in skin barrier function and dysregulation of the Th2 immune response are thought to be pivotal in AD pathogenesis. In this study, we used keratinocytes and AD-like skin equivalent models using Th2 cytokines IL-4 and IL-13. The keratinocytes and AD-like skin model were used to investigate the effect...

article

Computationally effective and accurate simulation of cyclic behaviour of old reinforced concrete columns

Chang Seok Lee, Sang Whan Han

Engineering Structures > 2018 > 173 > C > 892-907

To evaluate the seismic performance of existing old reinforced concrete (RC) buildings, it is important to use an accurate analytical model. Most columns in these buildings do not satisfy the reinforcement details specified by current seismic design provisions. Columns that possess insufficient reinforcement details can exhibit significant pinching and cyclic deterioration in their strength and stiffness...

article

Genetic variation and structure of Juniperus chinensis L. (Cupressaceae) in Korea

Eun-Hye Kim, Jae-Kwon Shin, Keum-Seon Jeong, Chang-Seok Lee, more

Journal of Ecology and Environment > 2018 > 42 > 1 > 1-9

Background Juniperus chinensis L. populations are distributed locally on several areas including coastal cliffs which are difficult to access in the central eastern Korea. Wild populations inhabit relatively barren environments such as rocky areas and cliffs, which are very sensitive to even minor environmental disturbances including artificial interventions and natural disturbances, and thus demonstrate...

article

Floristic composition and species richness of soil seed bank in three abandoned rice paddies along a seral gradient in Gwangneung Forest Biosphere Reserve, South Korea

Yong-Chan Cho, Seon-Mi Lee, Chang-Seok Lee

Journal of Ecology and Environment > 2018 > 42 > 1 > 1-13

Background We sought to understand the relationship between the seed bank and vegetation in abandoned rice paddies in South Korea, in order to guide management of these sites. We investigated the floristic composition and species richness of the soil seed bank and ground vegetation in former paddies along three seral gradients (wet meadow, young forest, and mature forest) in Gwangneung Forest Biosphere...

article

Computationally Efficient and Accurate Simulation of Cyclic Behavior for Rectangular HSS Braces

Chang Seok Lee, Min Soo Sung, Sang Whan Han, Hyun Woo Jee

International Journal of Steel Structures > 2018 > 18 > 4 > 1125-1138

During earthquakes, braces behave in complex manners because of the asymmetric response nature of their responses in tension and compression. Hollow structural sections (HSS) have been popularly used for braces due to their sectional efficiency in compression. The purpose of this study is to accurately simulate the cyclic behavior of rectangular HSS braces using a computationally efficient numerical...

article

Regeneration of pitch pine (Pinus rigida) stands inhibited by fire suppression in Albany Pine Bush Preserve, New York

Chang-Seok Lee, George R. Robinson, Ingrid P. Robinson, Hansol Lee

Journal of Forestry Research > 2019 > 30 > 1 > 233-242

The Pine Barrens in New York State are dominated by pitch pine (Pinus ridgida) and scrub oaks (Quercus ilicifolia and Q. prinoides). With fire suppression over the last 90 years or so, P. rigida regeneration has become sparse, even in areas set aside to preserve this type of vegetation. We evaluated the effects of fire and an alternative disturbance (mechanical removal of vegetation) for increasing...

article

Early recovery process and restoration planning of burned pine forests in central eastern Korea

Ji Hong An, Chi Hong Lim, Yong Chan Cho, Chang Seok Lee

Journal of Forestry Research > 2019 > 30 > 1 > 243-255

In central eastern Korea, there has been a continued effort to sustain pine forests because of their value for wood and mushroom production, as well as for other resources. Through the analysis of previously burned areas, we clarified the effects of fire on vegetation dynamics of pine forests by measuring changes in species composition, population structure, and the growth rates of major tree species...

article

Allogenic succession of Korean fir (Abies koreana Wils.) forests in different climate condition

Chi Hong Lim, Ji Hong An, Song Hie Jung, Chang Seok Lee

Ecological Research > 2018 > 33 > 2 > 327-340

This study was conducted to clarify the changes in vegetation that occurred due to changing environmental factors, especially climate, at Korean fir (Abies koreana) stands with different climatic conditions established on Mt. Halla, which is located on a southern island of South Korea. The difference of species composition between sites was large and depended on elevation and slope aspect at lower...

article

Preface to the special issue

Chang Seok Lee, You Mi Lee

Ecological Research > 2018 > 33 > 2 > 287-288

article

Ecological consideration for several methodologies to diagnose vegetation phenology

Chi Hong Lim, Ji Hong An, Song Hie Jung, Gyung Bae Nam, more

Ecological Research > 2018 > 33 > 2 > 363-377

A challenge of phenological research is to integrate remotely sensed observations obtained at different spatial and temporal scales to provide information that contains both a high temporal density and fine spatial scale observations. This study aims to improve the level of spatial detail and the temporal density required for efficient monitoring of vegetation phenology by applying two remote sensing...

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INFONA - science communication portal

Search results for: Chang Seok Lee

Spiral‐Driven Vertical Conductivity in Nanocrystalline Graphene

Machine learning–assisted drift capacity prediction models for reinforced concrete columns with shape memory alloy bars

Amorphous Carbon Films for Electronic Applications

Randomised clinical trial: Safety, tolerability, pharmacodynamics and pharmacokinetics of zastaprazan (JP‐1366), a novel potassium‐competitive acid blocker, in healthy subjects

Featured Cover

Probabilistic residual deformation prediction model for rectangular reinforced concrete columns

Phenomenological hysteretic model for superelastic NiTi shape memory alloys accounting for functional degradation

Adaptive hysteretic model for reinforced concrete columns including variations in axial force and shear span length

Mannosylerythritol lipids inhibit melanogenesis via suppressing ERK‐CREB‐MiTF‐tyrosinase signalling in normal human melanocytes and a three‐dimensional human skin equivalent

Spatial distribution of vegetation along the environmental gradient on the coastal cliff and plateau of Janggi peninsula (Homigot), southeastern Korea

Ameliorating effect of dipotassium glycyrrhizinate on an IL-4- and IL-13-induced atopic dermatitis-like skin-equivalent model

Computationally effective and accurate simulation of cyclic behaviour of old reinforced concrete columns

Genetic variation and structure of Juniperus chinensis L. (Cupressaceae) in Korea

Floristic composition and species richness of soil seed bank in three abandoned rice paddies along a seral gradient in Gwangneung Forest Biosphere Reserve, South Korea

Computationally Efficient and Accurate Simulation of Cyclic Behavior for Rectangular HSS Braces

Regeneration of pitch pine (Pinus rigida) stands inhibited by fire suppression in Albany Pine Bush Preserve, New York

Early recovery process and restoration planning of burned pine forests in central eastern Korea

Allogenic succession of Korean fir (Abies koreana Wils.) forests in different climate condition

Preface to the special issue

Ecological consideration for several methodologies to diagnose vegetation phenology

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