Ha Myung Jeong, Myung Won Seo, Sang Mun Jeong, Byung Ki Na, Sang Jun Yoon, Jae Goo Lee, Woon Jae Lee,
To investigate the kinetic characteristics of coking coal mixed with biomass during pyrolysis, thermogravimetric (TG) and thermo-balance reactor (TBR) analyses were conducted under non-isothermal and isothermal condition. Yellow poplar as a biomass (B) was mixed with weak coking coal (WC) and hard coking coal (HC), respectively. The calculated activation energies of WC/B blends were higher than those of HC/B blends under non-isothermal and isothermal conditions. The coal/biomass blends show increased ...
Tópico(s): Coal and Its By-products
2014 - Elsevier BV | Bioresource Technology
Sang-Ho Yi, Woon-Jae Lee, Youngseok Lee, Wan-Ho Kim,
This study analyzed the current state of technical development of the BF-based process, to determine ways to reduce carbon consumption. The technical features of the hydrogen reduction ironmaking process were also examined as a decarbonized ironmaking method, and related issues that should be considered when converting to hydrogen reduction are discussed. The coal rate consumed by the reduction reaction in the coal-based BF process should be less than 50%. The heat requirement for indirect reduction ...
Tópico(s): Metal Extraction and Bioleaching
2021 - The Korean Institute of Metals and Materials | Korean Journal of Metals and Materials
Myung Won Seo, Ha Myung Jeong, Woon Jae Lee, Sang Jun Yoon, Ho Won, Yong Ku Kim, Doyeon Lee, Si Woo Han, Sang Done Kim, Jae Goo Lee, Sang Mun Jeong,
Tópico(s): activated carbon and charcoal
2020 - Elsevier BV | Chemical Engineering Journal
Seongmin Park, Yoongon Kim, Yuseong Noh, Tae‐Wook Kim, Hyunsu Han, Wongeun Yoon, Junil Choi, Sang-Ho Yi, Woon-Jae Lee, Won Bae Kim,
The schematic of CO 2 electrolysis to produce CO in an SOEC under the conditions of CO 2 gas containing H 2 S.
Tópico(s): Electrocatalysts for Energy Conversion
2019 - Royal Society of Chemistry | Journal of Materials Chemistry A
The catalytic activities of pure and mixed catalysts of alkali and transition metal salts in steam-char gasification at 700–850°C were measured with a thermobalance. The effects of catalyst loading (0–35 wt%) and composition, coal rank and steam partial pressure were determined. The initial rate increases with increasing steam partial pressure in non-catalytic gasification but is almost independent of it in catalytic gasification. The catalytic activities of single salts are in the order K2CO3 > Ni( ...
Tópico(s): Metal Extraction and Bioleaching
1995 - Elsevier BV | Fuel
Woon-Jae Lee, Sang-Done Kim, Byung-Ho Song,
Tópico(s): Chemical Looping and Thermochemical Processes
2001 - Springer Science+Business Media | Korean Journal of Chemical Engineering
Hong-Sik Ahn, Woon-Jae Lee, Sang-Done KimDg, Byung-Ho Song,
Tópico(s): Fluid Dynamics and Mixing
1999 - Springer Science+Business Media | Korean Journal of Chemical Engineering
Woon-Jae Lee, Sang-Done Kim, Byung-Ho Song,
Tópico(s): Thermochemical Biomass Conversion Processes
2002 - Springer Science+Business Media | Korean Journal of Chemical Engineering
S. K. Gupta, Fenglei Shen, Woon-Jae Lee, Graham O’Brien,
A range of Australian and overseas coals with a mean maximum vitrinite reflectance (Ro, max) range of 0.68–1.71% were carbonized in a test coke oven. Coal properties were characterized using XRF, XRD and automated imaging of polished sections of discrete coal grains. The Full Maceral Reflectance (FMR) parameter was calculated from the reflectance data and was correlated with coal as well as coke properties. The Ro, max values and the vitrinite estimates from the semi-automated microscopic technique ...
Tópico(s): Coal and Coke Industries Research
2011 - Elsevier BV | Fuel
Woon-Jae Lee, Yong‐Jun Cho, Jung Rae Kim, Sang Done Kim,
Tópico(s): Cyclone Separators and Fluid Dynamics
1992 - Springer Science+Business Media | Korean Journal of Chemical Engineering
Coal carbonization for various kinds of single coals, coal blends, and operating conditions has been carried out in a movable-wall test coke oven (0.18 mW × 0.4 mH × 0.45 mL) to investigate the coking pressure behavior. The internal gas pressure and its corresponding temperature at the coal charge center were measured using the probe with thermocouple. Internal gas pressure of single coals increases with an increase of coking capacity and a decrease of volatile matter content. The internal gas pressure ...
Tópico(s): Iron and Steelmaking Processes
2001 - American Chemical Society | Energy & Fuels
Shee Eun Lee, Woon Jae Chung, Han Bok Kwak, Chae-Heon Chung, KyuBum Kwack, Zang Hee Lee, Hong‐Hee Kim,
Differentiated osteoclasts have a short life span. We tested various cytokines and growth factors for the effects on the survival of purified mature osteoclasts. In the absence of any added factors, osteoclasts exhibited the survival rate of less than 25% after a 24-h incubation. Among the tested factors, tumor necrosis factor-α (TNF-α) was found to increase the survival rate to ∼80%. The TNF-α-enhanced survival of osteoclasts appeared to be associated with reduction in apoptosis and suppression of ...
Tópico(s): NF-κB Signaling Pathways
2001 - Elsevier BV | Journal of Biological Chemistry
Hong‐Hee Kim, Shee Eun Lee, Woon Jae Chung, Youngyeon Choi, KyuBum Kwack, Si Wouk Kim, Myong Soo Kim, Hyunsung Park, Zang Hee Lee,
It has been suggested that blood vessel formation is an important event coupled to bone formation. The expression of vascular endothelial growth factor (VEGF), a potent angiogenic factor, has been shown to be greatly stimulated in osteoblasts by hypoxic stimuli such as deprivation of oxygen and treatment with cobalt. In other cell types, hypoxia-inducible factor-1 (HIF-1) that binds hypoxia-response element (HRE) has been shown to mediate gene expression induced by hypoxic stimuli. In this study, we ...
Tópico(s): High Altitude and Hypoxia
2002 - Elsevier BV | Cytokine
Hong-Hee Kim, Woon Jae Chung, Soo Woong Lee, Pah-Jin Chung, Jae Won You, Ho Jeong Kwon, Sakae Tanaka, Zang Hee Lee,
Osteoclast differentiation is a multi-step process that involves cell proliferation, commitment, and fusion. Some adhesion molecules, including integrin αvβ3, have been shown to have roles in osteoclast fusion. In the course of studying with pharmacologic agents known to inhibit protein tyrosine kinases of the Src family, we found that radicicol increased cell fusion during receptor activator of nuclear factor kappaB ligand (RANKL)-driven differentiation of osteoclasts at concentrations far below ...
Tópico(s): NF-κB Signaling Pathways
2003 - Elsevier BV | Experimental Cell Research
Taehoon Kim, Young-Pil Yun, Young Eun Park, Suk-Ha Lee, Woon-Jae Yong, Joydip Kundu, Jin Woo Jung, Jin‐Hyung Shim, Dong‐Woo Cho, Sung Eun Kim, Hae‐Ryong Song,
The aim of this study was to develop novel polycaprolactone/poly(lactic-co-glycolic acid) (PCL/PLGA) scaffolds with a heparin-dopamine (Hep-DOPA) conjugate for controlled release of bone morphogenic protein-2 (BMP-2) to enhance osteoblast activity in vitro and also bone formation in vivo. PCL/PLGA scaffolds were prepared by a solid freeform fabrication method. The PCL/PLGA scaffolds were functionalized with Hep-DOPA and then BMP-2 was sequentially coated onto the Hep-DOPA/PCL/PLGA scaffolds. The characterization ...
Tópico(s): Periodontal Regeneration and Treatments
2014 - IOP Publishing | Biomedical Materials
Jungho Shin, Woon-Jae Lee, Young-Pyo Kim, In-Yong Ko,
In this study, a super carburizing treatment was applied to improve roller pitting fatigue life. It produced excellent properties of surface hardness and temper softening resistance by forming precipitation of fine and spherodized carbides on a tempered marstensite matrix through the repeated process of carburization and diffusion after high temperature carburizing step 1. The cycle II performed two times carburizing/diffusion cycle (process) after super carburization at 1,000°C had fine and spherodized ...
Tópico(s): Metallurgy and Material Forming
2012 - The Korean Institute of Metals and Materials | Korean Journal of Metals and Materials
S.W Lee, Han Bok Kwak, Woon Jae Chung, Heesun Cheong, H.-H Kim, Z.H Lee,
Protein kinase C (PKC) proteins have been shown to be involved in diverse cellular responses of various cell types. In experiments to identify genes regulated during osteoclast differentiation by a cDNA microarray approach, we found that the gene expression of PKC-βII was upregulated in differentiated cells. Reverse transcription–polymerase chain reaction and Western blotting analyses also showed an increase in PKC-βI as well as PKC-βII during osteoclast formation in mouse bone marrow cell cultures ...
Tópico(s): NF-κB Signaling Pathways
2003 - Elsevier BV | Bone
Jung Hwa Choi, Woon Jae Chung, Su Ji Han, Hwanghee Blaise Lee, Il Whan Choi, Hern Ku Lee, Kyu Yun Jang, Dong Geun Lee, Sang Seop Han, Ki Hun Park, Suhn Young Im,
Tópico(s): Inflammatory mediators and NSAID effects
2000 - Springer Science+Business Media | Inflammation
Soonho Kwon, Woon-Jae Lee, Chan Won Jo,
In the situation where there should be a gap between the design environments of 2D drawing and 3D BIM modeling, it is unavoidable aspect to face confusion caused by parallel usage of both technologies unless the project delivery systems are entirely upgraded to 3D. Therefore, it is critical to make efforts to minimize this confusion. Meanwhile, detailed drawings have very important roles in the construction process because they do not only concretely express construction methods for a given design ...
Tópico(s): BIM and Construction Integration
2013 - | Korean Journal of Computational Design and Engineering
Seon Ah Roh, Sung Real Son, Sang Done Kim, Woon Jae Lee, Yong Kuk Lee,
Pyrolysis kinetics of a pine nut shell in a thermo gravimetric analyzer (TGA) and the combustion and steam gasification kinetics of a pine nut shell’s chars in a thermobalance reactor were determined. Also, the steam gasification characteristics of the pine nut shell were determined in a fluidized bed reactor. The maximum pyrolysis reaction rate is obtained at 360oC from the TGA and DTG studies. The activation energy and the pre-exponential factor of the char were determined from the Arrhenius plot ...
Tópico(s): Granular flow and fluidized beds
2005 - Trans Tech Publications | Key engineering materials
Woon Jae Yong, Jun Tan, Arnold Adikrishna, Hyun‐Joo Lee, Jin Woo Jung, Dong‐Woo Cho, In‐Ho Jeon,
Tópico(s): Musculoskeletal synovial abnormalities and treatments
2014 - Springer Science+Business Media | Surgical and Radiologic Anatomy
Jin Woo Lee, Yeong‐Jin Choi, Woon-Jae Yong, Falguni Pati, Jin‐Hyung Shim, Kyung Shin Kang, In‐Hye Kang, Jaesung Park, Dong‐Woo Cho,
Several studies have focused on the regeneration of liver tissue in a two-dimensional (2D) planar environment, whereas actual liver tissue is three-dimensional (3D). Cell printing technology has been successfully utilized for building 3D structures; however, the poor mechanical properties of cell-laden hydrogels are a major concern. Here, we demonstrate the printing of a 3D cell-laden construct and its application to liver tissue engineering using 3D cell printing technology through a multi-head tissue/ ...
Tópico(s): Bone Tissue Engineering Materials
2016 - IOP Publishing | Biofabrication
Yoo Duk Choi, Changwoo Han, Woon-Jae Chung, Woon‐Won Jung, Ji Shin Lee, Jong‐Hee Nam, Min Cheol Lee, Sang‐Woo Juhng, Ho-Sun Choi, Chang-Soo Park,
BACKGROUNDHPV-other samples are designated as being positive on HPV-PCR, but negative when using specific HPV hybridization probes. We wanted to determine the types on the HPV-other samples by performing sequencing, and to know the pathologic status of the uterine cervix according to the HPV type detected on sequencing.METHODSFor HPV genotying, we used the commercially available HPV DNA Chip test, which contains 15 types of high-risk HPV and 9 types of low-risk HPV. The HPV DNA sequencing was performed ...
Tópico(s): Molecular Biology Techniques and Applications
2009 - Korean Society of Pathologists & the Korean Society for Cytopathology | The Korean Journal of Pathology
Chi‐Woong Mun, Ji-Youn Cho, Woon-Jae Shin, Ki-Seung Choi, Choong-Ki Eun, Seong Sook, Jung‐Hee Lee, Young Il Yang, Sanghee Nam, Jeong-Koo Kim, Soo Yeol Lee,
The present study was performed to determine the characteristics of the biochemical metabolites related to gastric cancer using ex vivo (1)H magnetic resonance spectroscopy (MRS), and to assess the clinical usefulness. A total of 35 gastric specimens resected during surgery for gastric cancer were used to compare MR spectra. A 1.5-T (64-MHz) clinical MR imager equipped with facilities for spectroscopy was used to obtain MR spectra from 33 gastric specimens. High-resolution (1)H nuclear magnetic resonance ( ...
Tópico(s): NMR spectroscopy and applications
2004 - Elsevier BV | Magnetic Resonance Imaging
Min-seok Yun, Sung Ho Cho, Rena Lee, Gi-won Jang, Yun-seok Kim, Woon-jae Shin, Sanghee Nam,
Radiation detectors are currently fabricated by a screen-print method at room temperature. However, this method has many disadvantages in terms of thickness control and electron trapping. We fabricated polycrystalline PbI 2 films by a new sedimentation method and compared the results with those obtained by the existing screen-print (SP) method. We investigated the electrical and structural properties of the films. We fabricated 2 ×2 cm 2 sample films with a thickness of about 200 µm. A field emission ...
Tópico(s): Semiconductor Quantum Structures and Devices
2010 - Institute of Physics | Japanese Journal of Applied Physics
Joong Hwan Jun, Young‐Kook Lee, Jeongmin Kim, Ki‐Tae Kim, Woon Jae Jung,
Microstructures and damping properties have been investigated in Fe-23%Mn-(0~2)%Si and Fe-23%Mn-(0~2)%Co alloys, based on experimental results from metallography, X-ray diffractometry and vibration test in a flexural mode. The amount and number density of ε martensite are increased with an increase in Co content, resulting in the improvement of damping capacity. For the same ε martensite content, the higher the Co content, the greater the damping capacity. On the contrary, an addition of Si affects ...
Tópico(s): Laser and Thermal Forming Techniques
2006 - Trans Tech Publications | Key engineering materials
Zin Win Thu, Dasom Kim, Junseok Lee, Woon-Jae Won, Hyunjun Lee, Nan Lao Ywet, Aye Aye Maw, Jae-Woo Lee,
In this paper, we introduce a new formulation of the multivehicle point-to-point network problem to be utilised in urban air mobility (UAM) vertiport-to-vertiport network operations. Vehicle routing problems (VRPs) and their variants have previously been studied and applied in real-world situations, but these problems require additional depot locations, and not all the vehicles can travel to all the locations. In UAM operations, additional depot locations may not be required, and all vehicles can ...
Tópico(s): Aviation Industry Analysis and Trends
2022 - Multidisciplinary Digital Publishing Institute | Applied Sciences
Seon Ah Roh, Sung Real Son, Sang Done Kim, Woon Jae Lee, Yong Kuk Lee,
Tópico(s): Granular flow and fluidized beds
2005 - Trans Tech Publications | Key engineering materials
Jeong‐Min Kim, Gun Ha Lee, Joong Hwan Jun, Ki‐Tae Kim, Woon Jae Jung,
Mg-8%Al-1%Ca was selected as a base alloy composition and small amounts of minor alloying elements, RE or Sr, were added. Microstructure of as-cast Mg-8%Al-1%Ca base alloys consists of dendritic primary Mg, Mg-Al-Ca and Mg17Al12 phases. Mg-Al-RE-(Ca) phase in the RE-added alloys and Mg-Al-Sr-(Ca) phase in the Sr-added alloys were additionally found. The creep resistance of Mg-8%Al based alloy was significantly improved by the minor alloying elements additions with 1%Ca. Comparatively globular primary ...
Tópico(s): Hydrogen Storage and Materials
2006 - Scientific.net | Diffusion and defect data, solid state data. Part B, Solid state phenomena/Solid state phenomena
Chan-Won Jo, Soonho Kwon, Woon-Jae Lee, Taeim Roh, Jong-Ho Ock,
This study aims to provide power monitoring system for super tall buildings with 3D BIM (Building Information Modeling) technology. In order to realize this subject, standard specifications for BIM objects and attributes were studied through analyzing processes and elements of electrical utilities for power management systems applied for super tall buildings. These standard BIM specifications could be used by designers, contractors and facility operators, and thus could be helpful to realize BIM ...
Tópico(s): BIM and Construction Integration
2012 - | Korean Journal of Computational Design and Engineering