Beob-Yi Lee, Se-Jung Lee, Sung Soo Park, Si‐Kwan Kim, Sung‐Ryong Kim, Jae Hyun Jung, Wun‐Jae Kim, Sung‐Kwon Moon,
The present study identified a novel mechanism for the effects of sanguinarine in vascular smooth muscle cells (VSMC). Sanguinarine treatment of VSMC resulted in significant growth inhibition as a result of G1-phase cell-cycle arrest mediated by induction of p27KIP1 expression, and resulted in a down-regulation of the expression of cyclins and CDKs in VSMC. Moreover, sanguinarine-induced inhibition of cell growth appeared to be linked to activation of Ras/ERK through p27KIP1-mediated G1-phase cell- ...
Tópico(s): Ubiquitin and proteasome pathways
2008 - Elsevier BV | Archives of Biochemistry and Biophysics
Myung Gwan Hahm, Hailong Wang, Hyun Young Jung, S. K. Hong, Sung‐Goo Lee, Sung‐Ryong Kim, Moneesh Upmanyu, Yung Joon Jung,
High-density carbon nanotube networks (CNNs) continue to attract interest as active elements in nanoelectronic devices, nanoelectromechanical systems (NEMS) and multifunctional nanocomposites. The interplay between the network nanostructure and its properties is crucial, yet current understanding remains limited to the passive response. Here, we employ a novel superstructure consisting of millimeter-long vertically aligned single walled carbon nanotubes (SWCNTs) sandwiched between polydimethylsiloxane ( ...
Tópico(s): Conducting polymers and applications
2012 - Royal Society of Chemistry | Nanoscale
Seung‐Bok Choi, Sung-Ryong Hong, Kum-Gil Sung, Jung-Woo Sohn,
In this work, a mixed-mode magnetorheological (MR) mount is proposed and applied to the vibration control of a flexible beam structure subjected to external disturbances. On the basis of non-dimensional Bingham number, an appropriate size of the MR mount is designed and manufactured. After experimentally evaluating the field-dependent damping force of the MR mount, a structural system consisting of a flexible beam and vibrating rigid mass is established. The governing equation of motion of the system ...
Tópico(s): Effects of Vibration on Health
2007 - Elsevier BV | International Journal of Mechanical Sciences
Yeo-Pyo Yun, Jae‐Ho Do, Sung-Ryong Ko, Shi-Yong Ryu, Jung-Hyo Kim, Hocheol Song, Young‐Doo Park, Kyoo-Seok Ahn, Sung‐Hoon Kim,
This study was undertaken to evaluate the antithrombotic effects of Korean Red Ginseng (KRG) and its new prescription (KRGP) consisting of five herbs such as Korean red ginseng, Ganoderma, Cinnamomi Cortex, Glycyrrhizae Radix and Laminaria. In rats with blood stasis induced by high molecular weight dextran, KRG and KRGP significantly restored not only the number of platelets and fibrinogen, but also suppressed the fibrin degradation products (FDP) to normal range. In platelet aggregation assay with ...
Tópico(s): Pharmacological Effects of Natural Compounds
2001 - Elsevier BV | Journal of Ethnopharmacology
Min Ki Kim, Daeyoun David Won, Sun Min Park, Tae Jung Kim, Sung Ryong Kim, Seong Taek Oh, Seung Kook Sohn, Mi Yeon Kang, In Kyu Lee,
Purpose Debates exist regarding the effectiveness of adjuvant chemotherapy for stage II colon cancer. This study aimed to investigate the current status of adjuvant chemotherapy and its impact on survival for Korean stage II colon cancer patients by analyzing the National Quality Assessment data. Materials and Methods A total of 7,880 patientswho underwent curative resection for stage II colon adenocarcinoma between January 2011 andDecember 2014 in Koreawere selected randomly as evaluation subjects ...
Tópico(s): Gastric Cancer Management and Outcomes
2017 - Korean Cancer Association | Cancer Research and Treatment
Jin‐Kyu Park, Uk Namgung, Chang Joong Lee, Jong Oh Park, Sung‐Ha Jin, Oh‐Bin Kwon, Sung Ryong Ko, Sang Won Kim, Eun Jung Kang, Ji Hun Ko, Sang Myung Lee, Dong Hee Kim, Moo Ho Won,
Recent studies have indicated that Ginsenoside Rb1, one of the major components of ginseng root, may play an important role in protecting cells from damage. Here, we investigated the neuroprotective activity of Rb1 after hypoxic injury in young rats. About 50% animals were dead by exposing hypoxic condition three times in three consecutive days. Then, the pretreatment with Rb1 prior to hypoxic stimulation reduced animal death to 12%, and also significantly reduced the recovery time from hypoxia- ...
Tópico(s): Autophagy in Disease and Therapy
2004 - Elsevier BV | Life Sciences
Seok‐Keun Koh, Sung‐Chul Park, Sung‐Ryong Kim, Won Kook Choi, Hyung‐Jin Jung, Kook D. Pae,
A surface of thin square polytetrafluoroethylene (PTFE) samples (1 × 1 × 0.2 cm3) was irradiated with Ar+ at 1 keV with varying ion dose from 5 × 1014 to 1 × 1017 ions/cm2 with and without an oxygen environment. The irradiated surface of the samples was examined by scanning electron microscopy (SEM) for surface textural changes and x-ray photoelectron spectrometry (XPS) for changes in chemical structure. A wettability test was conducted on the irradiated surface of PTFE samples by water droplets. A Scotch ™ tape ...
Tópico(s): Diamond and Carbon-based Materials Research
1997 - Wiley | Journal of Applied Polymer Science
Sung-Ryong Hong, Seung‐Bok Choi, Woo‐Jin Jung, Il Bae Ham, Dong‐seong Kim,
Tópico(s): Seismic Performance and Analysis
2001 - Elsevier BV | Journal of Sound and Vibration
Sung-Ryong Hong, Seung‐Bok Choi, Woo‐Jin Jung, W.B. Jeong,
This paper presents vibration control of flexible structures using squeeze mode ER mounts. After devising the squeeze mode ER mount, its field-dependent damping forces are evaluated at various exciting frequencies. The ER mounts are then incorporated with a flexible beam structure. The governing equation of motion is obtained and an optimal controller which represents controllable damping force is designed to attenuate unwanted structural vibration. The controller is experimentally realized and ...
Tópico(s): Structural Health Monitoring Techniques
2002 - SAGE Publishing | Journal of Intelligent Material Systems and Structures
Yun Jae Lee, Philip Caspari, Dorina M. Opris, Frank Nüesch, Sora Ham, Jung-Hyuk Kim, Sung‐Ryong Kim, Byeong‐Kwon Ju, Won Kook Choi,
Novel silicone composites with increased dielectric permittivity were tested as dielectric in electret dielectric elastomer generators and gave a voltage when stretched.
Tópico(s): Ferroelectric and Piezoelectric Materials
2019 - Royal Society of Chemistry | Journal of Materials Chemistry C
Heon Woong Kim, Sung Ryong Kim, Young Min Lee, Hwan Hee Jang, Jung Bong Kim,
Anthocyanin concentration and composition and the effect of steaming and baking on these were evaluated in tubers of Korean red- and purple-fleshed potato cultivars and breeding clones using liquid chromatography with diode array detection and electrospray ionization-mass spectrometry (LC-DAD-ESI-MS). Twenty-six anthocyanins were isolated, of which 24 were identified. Remarkably, five cis isomers were identified, of which four, viz., cis-petanin, cis-peonanin, petunidin 3-cis-caffeoylrutinoside-5- ...
Tópico(s): Plant Pathogens and Resistance
2017 - Springer Science+Business Media | Potato Research
Sung Ryong Ha, Dhong Il Jung, Cho Hee Yoon,
Runoff loads of pollutant in agricultural watersheds were spatially analyzed by using geographic information system(GIS) technology. The topological relationship between pollution sources in the watershed was, first of all, identified by using the developed digital map of land use and then the pollutant loads generated from each source was estimated by applying a conventional unit loading factor on the obtained digital information of pollution sources. To evaluate the loads delivered from spatially ...
Tópico(s): Hydrology and Watershed Management Studies
1998 - Pergamon Press | Water Science & Technology
Woo‐Jin Jung, W.B. Jeong, Sung-Ryong Hong, Seung‐Bok Choi,
This paper presents vibration control of a flexible beam structure supported by squeeze-mode electro-rheological (ER) mounts. After devising an appropriate size of the squeeze-mode ER mount, its field-dependent damping forces are evaluated at various exciting frequencies. The damping force controllability of the ER mount is also demonstrated by implementing a proportional integral derivative (PID) controller. The ER mounts are then incorporated with a flexible beam structure subjected to external ...
Tópico(s): Vibration and Dynamic Analysis
2003 - Elsevier BV | Journal of Sound and Vibration
Sung Ryong Ha, Dhong Il Jung, Cho Hee Yoon,
Runoff loads of pollutant in agricultural watersheds were spatially analyzed by using geographic information system(GIS) technology. The topological relationship between pollution sources in the watershed was, first of all, identified by using the developed digital map of land use and then the pollutant loads generated from each source was estimated by applying a conventional unit loading factor on the obtained digital information of pollution sources. To evaluate the loads delivered from spatially ...
Tópico(s): Water Quality and Pollution Assessment
1998 - Pergamon Press | Water Science & Technology
Dineshkumar Mani, Minh Canh Vu, Tae‐Hyeong Jeong, Jun‐Beom Kim, Choong‐Sun Lim, Jung-Hyuk Lim, Kyung Min Kim, Sung‐Ryong Kim,
Graphene-based polymer composites possess high thermal conductivity, unfortunately, the high electrical conductivity of these composites limits their application in electronic devices. To address this issue, we report on the thermally conducting yet electrically insulating graphene fluoride (GF) based epoxy composites. GF was coated on cell walls of polyurethane foam (PUF) by a cyclic assembly deposition process, and the [email protected] foam was subsequently compressed and infiltrated with epoxy ...
Tópico(s): Thermal Radiation and Cooling Technologies
2021 - Elsevier BV | Composites Part A Applied Science and Manufacturing
Dineshkumar Mani, Minh Canh Vu, Choong‐Sun Lim, Jun‐Beom Kim, Tae‐Hyeong Jeong, Hye Jin Kim, M. A. Islam, Jung‐Hyurk Lim, Kyung‐Min Kim, Sung‐Ryong Kim,
The rapid innovation of flexible smart electronics has increased the demand for flexible thermally conductive films with the high performance of electromagnetic interference shielding (EMI). This study focuses on graphene nanoplatelets/polyurethane (GnP/PU) films that were fabricated utilizing the solution casting approach. The stretching-induced alignment method was then used to align the GnP sheets horizontally in the PU matrix by uniaxially stretching to a particular degree. The resultant stretched ...
Tópico(s): Tribology and Wear Analysis
2022 - Elsevier BV | Carbon
Kyung‐Min Kim, Jung‐Hyurk Lim, Nae‐Youn Jang, Sung‐Ryong Kim,
Abstract Hybrid polyacetylene gels having polyhedral oligomeric silsesquioxanes (POSS) moieties were prepared by polymerization of 2‐ethynylpyridine using octafunctional POSS as an initiator with changing the feed ratio of POSS to 2‐ethynylpyridine. The resulting black polyacetylene gels were not soluble in any organic solvents such as THF, chloroform, methanol, DMF, and acetone. The polyacetylene gels with higher mole ratio of 2‐ethynylpyridine to POSS show higher thermal stability because of the ...
Tópico(s): biodegradable polymer synthesis and properties
2007 - Wiley | Macromolecular Symposia
Sung Jin Hwang, Jae Young, Seh Geun Park, Gi Jung Joe, Hyung Min Kim, Hyung Bae Moon, Se Jin Jeong, Jung Sup Lee, Dong Hwa Shin, Sung Ryong Ko, Jong Kun Park,
In this study we investigated the effect of ginseng saponins on the p53-dependent apoptosis in NIH3T3 cells exposed to methyl methanesulfonate (MMS), an alkylating agent. Trypan blue exclusion assay, cell morphology studies, and apoptotic index determined by acridine orange staining showed that the postincubation of MMS-exposed cells in medium containing diol- (PD) or triol-type (PT) ginseng saponins potentiate the apoptotic cell death. FACS analysis indicated that the increased apoptotic cell population ...
Tópico(s): Ginseng Biological Effects and Applications
2002 - Elsevier BV | Toxicology and Applied Pharmacology
Ki-Heon Choi, Hyun Lim, Sung Ryong Oh, Woo‐Hyun Chung, Joohee Jung,
Interest in marine bioresources is increasing in the drug development sector. In particular, marine sponges produce a wide range of unique metabolites that enable them to survive in challenging environments, which makes them attractive sources of candidate pharmaceuticals. In previous study, we investigated over 40 marine specimens collected in Micronesia and provided by the Korean Institute of Ocean Science and Technology, for their antiproliferative effects on various cancer cell lines, and Lipastrotethya ...
Tópico(s): Biological Research and Disease Studies
2017 - Hindawi Publishing Corporation | Evidence-based Complementary and Alternative Medicine
Jieun Kim, Younghun Shin, Seong‐Hun Yun, Dong-Sik Choi, Jihye Nam, Sung Ryong Kim, Sung‐Kwon Moon, Bong Hyun Chung, Jae-hyuck Lee, Jae‐Ho Kim, Kiyoung Kim, Kyung‐Min Kim, Jung‐Hyurk Lim,
The ability of dip-pen nanolithography (DPN) to generate nano- or microarrays of soft or hard materials (e.g., small molecules, DNA, proteins, nanoparticles, sols, and polymers) in a direct-write manner has been widely demonstrated. The transporting of large-sized ink materials such as bacteria, however, remains a significant challenge with this technique. The size limitation of the water meniscus formed between the DPN tip and the solid surface becomes a bottleneck in such diffusion-based molecular ...
Tópico(s): Monoclonal and Polyclonal Antibodies Research
2012 - American Chemical Society | Journal of the American Chemical Society
Jung Hoon Park, Jae Chun Hyun, Woo Nyon Kim, Sung‐Ryong Kim, Seung Chan Ryu,
Tópico(s): Polymer Nanocomposites and Properties
2002 - Springer Science+Business Media | Macromolecular Research
Chul–Su Yang, Sung-Ryong Ko, Byung‐Goo Cho, Dong Min Shin, Jae‐Min Yuk, Shengjin Li, Jin‐Man Kim, Ronald M. Evans, Jun‐Sub Jung, Dong‐Keun Song, Eun‐Kyeong Jo,
Compound K (C-K), a protopanaxadiol ginsenoside metabolite, was previously shown to have immunomodulatory effects. Here, we describe a novel therapeutic role for C-K in the treatment of lethal sepsis through the modulation of Toll-like receptor (TLR) 4-associated signalling via glucocorticoid receptor (GR) binding. In mononuclear phagocytes, C-K significantly repressed the activation of TLR4/lipopolysaccharide (LPS)-induced NF-kappaB and mitogen-activated protein kinases (MAPKs), as well as the secretion ...
Tópico(s): Natural product bioactivities and synthesis
2008 - Wiley | Journal of Cellular and Molecular Medicine
Hyun Chul Jung, Woo Nyon Kim, Chang Ryong Lee, Kwang S. Suh, Sung-Ryong Kim,
Abstract Limiting oxygen index (LOI) value, glass transition temperature (T g ), thermal degradation profile, morphology, and tensile strength and elongation at break of the flame-retarding polycarbonate (PC)-poly(acrylonitrile- butadiene-styrene) (ABS) (7/3) blends were studied. The flame retardants used were huntite-hydromagnetite compounds (HHM), triphenyl phosphate (TPP), zinc stannate, and antimony trioxide. The LOI values were increased with the increase of TPP content, but they did not change significantly ...
Tópico(s): biodegradable polymer synthesis and properties
1998 - De Gruyter | Journal of Polymer Engineering
Hyun Tae Kim, Eun Sang Yoo, Sung Ryong Cho, Hee Chang Jung, Sung Kwang Chung, Bup Wan Kim, Yoon Kyu Park, Tae Gyun Kwon,
... Center Experience Hyun Tae Kim, Eun Sang Yoo, Sung Ryong Cho, Hee Chang Jung, Sung Kwang Chung, Bup Wan Kim, Yoon Kyu ... Eun Sang Yoo More articles by this author Sung Ryong Cho More articles by this author Hee Chang Jung More articles by this author Sung Kwang Chung ...
Tópico(s): Renal cell carcinoma treatment
2007 - Lippincott Williams & Wilkins | The Journal of Urology
Minh Canh Vu, Nhat Anh Thi Thieu, Jung‐Hyurk Lim, Won Kook Choi, Jong Chan Won, M. A. Islam, Sung‐Ryong Kim,
With the development of portable and flexible electronic devices, demends for high-performance thermal management materials with high thermal conductivity and electrical insulation are growing. Recently, graphene fluoride has received numerous attention from science community due to its high thermal conductivity and electrical insulation. Here, we report an advanced exfoliated graphene fluoride (EGF) film as a high performance heat spreader and thermal interface material for flexible electronic devices, ...
Tópico(s): Graphene research and applications
2019 - Elsevier BV | Carbon
Se-Yeon Jung, Seok‐Yong Choi, Yoo-Seung Ko, Chul‐Seung Park, Seikwan Oh, Sung-Ryong Koh, Uhtaek Oh, Jae-Wook Oh, Man Hee Rhee, Seung-Yeol Nah,
Ginsenosides, or ginseng saponins, are biologically active ingredients of Panax ginseng. Accumulating evidence suggests that ginsenosides can alleviate pain from injections of noxious chemicals, such as capsaicin [Nah et al. (2000)]. In this study we examined the effects of ginsenoside Rc on the capsaicin-induced inward current in Xenopus oocytes that expresses the vanilloid receptor 1 (VR1). Ginsenoside Rc enhanced the capsaicin-induced inward current in a concentration-dependent and reversible manner, ...
Tópico(s): Ion Channels and Receptors
2001 - Springer Science+Business Media | Molecules and Cells
Na‐Mi Kim, Sung-Ryong Ko, Kang-Ju Choi, Woo‐Jung Kim,
Tópico(s): Seed and Plant Biochemistry
1993 - Springer Nature | Applied Biological Chemistry
Ji-Young Noh, Yun-Su Kuk, Taeeun Kim, Sung‐Ryong Kim, Ki-Young Kim, Jung‐Hyurk Lim, Kyung Min Kim,
탄소섬유 전구체로 폴리아크릴로나이트릴(PAN)계 중합체를 공단량체로 중성계 모노머인 methyl acrylate와 산성계 모노머인 itaconic acid 또는 acrylic acid를 사용하여 서로 다른 조성과 함량으로 용액중합을 통하여 높은 수율로 제조하였다. PAN 중합체의 화학구조, 고유점도 및 분자량은 핵자기 공명 분광기(SUP1/SUPH NMR), 우벨로오드 점도계로 확인하였고, 퓨리에 변환 적외선 분광기(FTIR) 분석 및 고리화 반응지수를 통하여 열처리 온도에 따른 열산화 안정화 과정에서 일어나는 고리화 반응과 탈수소화 반응에 의한 PAN 중합체의 구조변화와 공단량체의 함량과 조성이 고리화 반응에 미치는 영향을 관찰하였고, 열산화 안정화 과정에서 PAN 중합체의 고리화 개시온도 및 개시효율과 탄소 잔존량은 시차 주사 열량계(DSC)와 열 중량 분석기(TGA)를 통해 확인하였다.
Tópico(s): Advanced Battery Materials and Technologies
2021 - The Polymer Society of Korea | Polymer Korea
Gyu-Dae Park, Hyun-Ok Jung, Kyung Min Kim, Jung‐Hyurk Lim, Ju-Won Lee, Sung‐Goo Lee, Jae Heung Lee, Sung‐Ryong Kim,
Tópico(s): Recycling and Waste Management Techniques
2015 - Springer Science+Business Media | Macromolecular Research
Mohammad Al‐Mamun, Jung‐Hyurk Lim, Yung‐Eun Sung, Sung‐Ryong Kim,
Composites of a few layers of graphene (G) with different loadings of Au nanoparticles (NPs) were used as counter electrodes for dye-sensitized solar cells. Simple solution coating followed by a post thermal treatment was employed for the preparation of the counter electrodes. The graphene composite electrode with 30 nM Au NPs showed a 6.55% higher conversion efficiency (η = 1.79%) and 200 mV higher open-circuit voltage (0.60 V) than cells fabricated with sputtered Pt electrodes. The better electrocatalytic ...
Tópico(s): Advanced Nanomaterials in Catalysis
2012 - Oxford University Press | Chemistry Letters