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Search Results: 1 - 10 of 3565 matches for " Myoung-Hee Kwon "
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Comparison of the antibody responses to Plasmodium vivax and Plasmodium falciparum antigens in residents of Mandalay, Myanmar
Tong-Soo Kim, Hyung-Hwan Kim, Jung-Yeon Kim, Yoon Kong, Byoung-Kuk Na, Khin Lin, Sung-Ung Moon, Yeon-Joo Kim, Myoung-Hee Kwon, Youngjoo Sohn, Hyuck Kim, Hyeong-Woo Lee
Malaria Journal , 2011, DOI: 10.1186/1475-2875-10-228
Abstract: Malaria parasites were identified by microscopic examination. To test the antibodies against P. vivax and P. falciparum in sera, an indirect immunofluorescence antibody test (IFAT) was performed using asexual blood parasite antigens. An enzyme-linked immunosorbent assay (ELISA) was performed with circumsporozoite protein (CSP), Pvs25 and Pvs28 recombinant proteins of transmission-blocking vaccine candidates for P. vivax, and liver stage specific antigen-1 and -3 (PfLSA-1, PfLSA-3) for P. falciparum.Fourteen patients among 112 were found to be infected with P. vivax and 26 with P. falciparum by thick smear examination. Twenty-three patients were found to be infected with P. vivax, 19 with P. falciparum and five with both by thin smear examination. Blood samples were divided into two groups: Group I consisted of patients who were positive for infection by microscopic examination, and Group II consisted of those who showed symptoms, but were negative in microscopic examination. In P. falciparum, IgG against the blood stage antigen in Group I (80.8%) was higher than in Group II (70.0%). In P. vivax, IgG against the blood stage antigen in Group I (53.8%) was higher than in Group II (41.7%). However, the positivity rate of the PvCSP VK210 subtype in Group II (40.0%) was higher than in Group I (23.1%). Similarly for the PvCSP VK247 subtype, Group II (21.7%) was higher than that for Group I (9.6%). A similar pattern was observed in the ELISA using Pvs25 and Pvs28: positive rates of Group II were higher than those for Group I. However, those differences were not shown significant in statistics.The positive rates for blood stage antigens of P. falciparum were higher in Group I than in Group II, but the positive rates for antigens of other stages (PfLSA-1 and -3) showed opposite results. Similar to P. falciparum, the positive rate of pre-blood stage (CSP VK210 and 247 subtype) and post-blood stage (Pvs25 and 28) antigens of P. vivax were higher in Group II than in Group I. The
VLBI observations of bright AGN jets with KVN and VERA Array (KaVA): Evaluation of Imaging Capability
Kotaro Niinuma,Sang-Sung Lee,Motoki Kino,Bong Won Sohn,Kazunori Akiyama,Guang-Yao Zhao,Satoko Sawada-Satoh,Sascha Trippe,Kazuhiro Hada,Taehyun Jung,Yoshiaki Hagiwara,Richard Dodson,Shoko Koyama,Mareki Honma,Hiroshi Nagai,Aeree Chung,Akihiro Doi,Kenta Fujisawa,Myoung-Hee Han,Joeng-Sook Kim,Jeewon Lee,Jeong Ae Lee,Atsushi Miyazaki,Tomoaki Oyama,Kazuo Sorai,Kiyoaki Wajima,Jaehan Bae,Do-Young Byun,Se-Hyung Cho,Yoon Kyung Choi,Hyunsoo Chung,Moon-Hee Chung,Seog-Tae Han,Tomoya Hirota,Jung-Wook Hwang,Do-Heung Je,Takaaki Jike,Dong-Kyu Jung,Jin-Seung Jung,Ji-Hyun Kang,Jiman Kang,Yong-Woo Kang,Yukitoshi Kan-ya,Masahiro Kanaguchi,Noriyuki Kawaguchi,Bong Gyu Kim,Hyo Ryoung Kim,Hyun-Goo Kim,Jaeheon Kim,Jongsoo Kim,Kee-Tae Kim,Mikyoung Kim,Hideyuki Kobayashi,Yusuke Kono,Tomoharu Kurayama,Changhoon Lee,Jung-Won Lee,Sang Hyun Lee,Young Chol Minh,Naoko Matsumoto,Akiharu Nakagawa,Chung Sik Oh,Se-Jin Oh,Sun-Youp Park,Duk-Gyoo Roh,Tetsuo Sasao,Katsunori M. Shibata,Min-Gyu Song,Yoshiaki Tamura,Seog-Oh Wi,Jae-Hwan Yeom,Young Joo Yun
Physics , 2014, DOI: 10.1093/pasj/psu104
Abstract: The Korean very-long-baseline interferometry (VLBI) network (KVN) and VLBI Exploration of Radio Astrometry (VERA) Array (KaVA) is the first international VLBI array dedicated to high-frequency (23 and 43 GHz bands) observations in East Asia. Here, we report the first imaging observations of three bright active galactic nuclei (AGNs) known for their complex morphologies: 4C 39.25, 3C 273, and M 87. This is one of the initial result of KaVA early science. Our KaVA images reveal extended outflows with complex substructure such as knots and limb brightening, in agreement with previous Very Long Baseline Array (VLBA) observations. Angular resolutions are better than 1.4 and 0.8 milliarcsecond at 23 GHz and 43 GHz, respectively. KaVA achieves a high dynamic range of ~1000, more than three times the value achieved by VERA. We conclude that KaVA is a powerful array with a great potential for the study of AGN outflows, at least comparable to the best existing radio interferometric arrays.
The First Very Long Baseline Interferometry Image of 44 GHz Methanol Maser with the KVN and VERA Array (KaVA)
Naoko Matsumoto,Tomoya Hirota,Koichiro Sugiyama,Kee-Tae Kim,Mikyoung Kim,Do-Young Byun,Taehyun Jung,James O. Chibueze,Mareki Honma,Osamu Kameya,Jongsoo Kim,A-Ran Lyo,Kazuhito Motogi,Chungsik Oh,Nagisa Shino,Kazuyoshi Sunada,Jaehan Bae,Hyunsoo Chung,Moon-Hee Chung,Se-Hyung Cho,Myoung-Hee Han,Seog-Tae Han,Jung-Wook Hwang,Do-Heung Je,Takaaki Jike,Dong-Kyu Jung,Jin-seung Jung,Ji-hyun Kang,Jiman Kang,Yong-Woo Kang,Yukitoshi Kan-ya,Noriyuki Kawaguchi,Bong Gyu Kim,Jaeheon Kim,Hyo Ryoung Kim,Hyun-Goo Kim,Hideyuki Kobayashi,Yusuke Kono,Tomoharu Kurayama,Changhoon Lee,Jeong Ae Lee,Jeewon Lee,Jung-Won Lee,Sang Hyun Lee,Sang-Sung Lee,Young Chol Minh,Atsushi Miyazaki,Se-Jin Oh,Tomoaki Oyama,Sun-youp Park,Duk-Gyoo Roh,Tetsuo Sasao,Satoko Sawada-Satoh,Katsunori M. Shibata,Bong Won Sohn,Min-Gyu Song,Yoshiaki Tamura,Kiyoaki Wajima,Seog-Oh Wi,Jae-Hwan Yeom,Young Joo Yun
Physics , 2014, DOI: 10.1088/2041-8205/789/1/L1
Abstract: We have carried out the first very long baseline interferometry (VLBI) imaging of 44 GHz class I methanol maser (7_{0}-6_{1}A^{+}) associated with a millimeter core MM2 in a massive star-forming region IRAS 18151-1208 with KaVA (KVN and VERA Array), which is a newly combined array of KVN (Korean VLBI Network) and VERA (VLBI Exploration of Radio Astrometry). We have succeeded in imaging compact maser features with a synthesized beam size of 2.7 milliarcseconds x 1.5 milliarcseconds (mas). These features are detected at a limited number of baselines within the length of shorter than approximately 650 km corresponding to 100 Mlambda in the uv-coverage. The central velocity and the velocity width of the 44 GHz methanol maser are consistent with those of the quiescent gas rather than the outflow traced by the SiO thermal line. The minimum component size among the maser features is ~ 5 mas x 2 mas, which corresponds to the linear size of ~ 15 AU x 6 AU assuming a distance of 3 kpc. The brightness temperatures of these features range from ~ 3.5 x 10^{8} to 1.0 x 10^{10} K, which are higher than estimated lower limit from a previous Very Large Array observation with the highest spatial resolution of ~ 50 mas. The 44 GHz class I methanol maser in IRAS 18151-1208 is found to be associated with the MM2 core, which is thought to be less evolved than another millimeter core MM1 associated with the 6.7 GHz class II methanol maser.
Surface Wave Echo in a Semi-Bounded Plasma  [PDF]
Hee J. Lee, Myoung-Jae Lee
Journal of Modern Physics (JMP) , 2016, DOI: 10.4236/jmp.2016.712127
Abstract: Plasma echo theory is revisited to apply it to a semi-bounded plasma. Spatial echoes associated with plasma surface wave propagating in a semi-bounded plasma are investigated by calculating the second order electric field produced by external charges and satisfying the boundary conditions at the interface. The boundary conditions are two-fold: the specular reflection condition and the electric boundary condition. The echo spots are determined in terms of the perpendicular coordinate to the interface and the parallel coordinate along which the wave propagates. This improves the earlier works in which only the perpendicular coordinate is determined. In contrast with the echo in an infinite medium, echoes in a bounded plasma can occur at various spots. The diversity of echo occurrence spots is due to the discontinuity of the electric field at the interface that satisfies the specular reflection boundary condition. Physically, the diversity appears to be owing to the reflections of the waves from the interface.
Snoezelen to Promote Improved Emotional Status in Stroke Caused by Defoliat Exposure in the Vietnam War: Case Study  [PDF]
Su-Kyoung Lee, Sang-Yeol Lee, Myoung-Kwon Kim
Open Journal of Pathology (OJPathology) , 2013, DOI: 10.4236/ojpathology.2013.32014
Abstract:

Objectives: The effects of snoezelen-based therapy on emotional status were investigated in Vietnam War veterans with brain injury suspected to be caused by defoliant exposure. Methods: A single subject A-B-A-B experimental design was used to determine the effects of snoezelen-based therapy. Results: A pegboard test to examine physical changes in a psychologically stable state, showed a decrease in measured time required from pegboard test. In the present study, which used an A-B-A-B research design, the first test showed that the snoezelen reduced tension-anxiety, anger-hostility and depression-dejection while the second test showed similar effects, except for fatigue-inertia and confusion-bewilderment. Conclusion: Snoezelen therapy had a positive effect on emotional stability and cognitive ability in a patient with emotional instability due to combat experience in the Vietnam War and with stroke caused by defoliant exposure.

The Fundamental Groups of m-Quasi-Einstein Manifolds
Hee Kwon Lee
ISRN Geometry , 2011, DOI: 10.5402/2011/812541
Abstract:
Hierarchical Value Maps of Smart Phones, Portal Sites, and Social Network Services Based on User Involvement  [PDF]
Sang Hee Kwon, Min Kyung Cha, Seo Young Lee
Advances in Journalism and Communication (AJC) , 2015, DOI: 10.4236/ajc.2015.33007
Abstract: This study compares the hierarchical value maps (HVMs) for portal sites, smart phones, and social network services (SNSs) according to means-end chain theory. Means-end chain theory offers insights into how a media product satisfies the personal values of consumers. We derive the HVM for each media and investigate the effect of involvement on the HVM structure. A total of 424 individuals were queried for their opinions on the attributes, functional consequences, psychological consequences, and value of each media product through association pattern technique laddering. These elements constitute the value chain structure. Our findings show that the value of each media is determined by involvement levels. For each media, high-involvement user groups regard self-satisfaction as the most important value they aspire for. This study determines that different levels of involvement do not affect the relationships among the elements of the value chain. HVMs for smart phones, portal sites, and SNSs are focused on a special value. However, the level of involvement generally does not seem to alter the structures of HVMs.
Structural Dynamics and Epigenetic Modifications of Hoxc Loci along the Anteroposterior Body Axis in Developing Mouse Embryos
Hyehyun Min, Ji-Yeon Lee, Myoung Hee Kim
International Journal of Biological Sciences , 2012,
Abstract: Hox genes are organized as clusters and specify regional identity along the anteroposterior body axis by sequential expression at a specific time and region during embryogenesis. However, the precise mechanisms underlying the sequential spatio-temporal, collinear expression pattern of Hox genes are not fully understood. Since epigenetic modifications such as chromatin architecture and histone modifications have become crucial mechanisms for highly coordinated gene expressions, we examined such modifications. E14.5 mouse embryos were dissected into three parts along the anteroposterior axis: brain, trunk-anterior, and trunk-posterior. Then, structural changes and epigenetic modifications were analyzed along the Hoxc cluster using chromosome conformation capture and chromatin immunoprecipitation-PCR methods. Hox non-expressing brain tissues had more compact, heterochromatin-like structures together with the strong repressive mark H3K27me3 than trunk tissues. In the trunk, however, a more loose euchromatin-like topology with a reduced amount of H3K27me3 modifications were observed along the whole cluster, regardless of their potency in gene activation. The active mark H3K4me3 was rather closely associated with the collinear expression of Hoxc genes; at trunk-anterior tissues, only 3' anterior Hoxc genes were marked by H3K4me3 upon gene activation, whereas whole Hoxc genes were marked by H3K4me3 and showed expression in trunk-posterior tissues. Altogether, these results indicated that loosening of the chromatin architecture and removing H3K27me3 were not sufficient for, but rather the concomitant acquisition of H3K4me3 drove the collinear expression of Hoxc genes.
Gate-Tunable Spin Transport and Giant Electroresistance in Ferromagnetic Graphene Vertical Heterostructures
Nojoon Myoung,Hee Chul Park,Seung Joo Lee
Physics , 2015,
Abstract: We investigate spin transport through ferromagnetic graphene vertical heterostructures where a sandwiched tunneling layer is either a normal or ferroelectric insulator. We show that the spin-polarization of the tunneling current is electronically controlled via gate voltages. We also demonstrate that the tunneling current of Dirac fermions can be prohibited when the spin configuration of ferromagnetic graphene sheets is opposite. The giant electroresistance can thus be developed by using the proposed heterostructure in this study. The effects of temperature on the spin transport and the giant electroresistance ratio are also investigated. Our findings discover the prospect of manipulating the spin transport properties in vertical heterostructures through an electric fields via gate and bias electrodes.
Fe$^{\bf{15+}}$ dielectronic recombination and the effects of configuration interaction between resonances with different captured electron principal quantum number
Duck-Hee Kwon,Daniel Wolf Savin
Physics , 2010, DOI: 10.1103/PhysRevA.83.012701
Abstract: Dielectronic recombination (DR) of Na-like Fe$^{15+}$ forming Mg-like Fe$^{14+}$ via excitation of a $2l$ core electron has been investigated. We find that configuration interaction (CI) between DR resonances with different captured electron principal quantum numbers $n$ can lead to a significant reduction in resonance strengths for $n \geq 5$. Previous theoretical work for this system has not considered this form of CI. Including it accounts for most of the discrepancy between previous theoretical and experimental results.
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