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Search Results: 1 - 10 of 65320 matches for " Gon Jun Kim "
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Electromagnetic Wave Absorbing Composites with a Square Patterned Conducting Polymer Layer for Wideband Characteristics
Won-Jun Lee,Chun-Gon Kim
Shock and Vibration , 2014, DOI: 10.1155/2014/318380
Abstract: The applications of electromagnetic- (EM-) wave-absorbers are being expanded for commercial and military purposes. For military applications in particular, EM-wave-absorbers (EMWAs) could minimize Radar Cross Section (RCS) of structures, which could reduce the possibility of detection by radar. In this study, EMWA composite structure containing a square periodic patterned layer is presented. It was found that control of the pattern geometry and surface resistance induced EMWA characteristics which can create multiresonance for wideband absorption in composite structures. 1. Introduction 1.1. Periodic Patterns for Radar Absorbing Structures (RAS) An electrically conductive medium is used as an EM-wave reflector and shielding structure. When the conductive surface is engraved, DC can always be conducted, but in the case of AC, there is a specific region where the EM wave cannot be transmitted or reflected. In the frequency range of interest, periodic patterns such as EM wave filters are considered frequency selective surfaces. There are various methods and equations to verify the characteristics of the pattern layer; however, a computer simulation using FEM was assumed to be an effective tool to verify the accuracy of the equations. When the square array pattern is located in free space, the approximate equation for the resonance characteristics is as follows [1]: Total transmission occurs at and mean the size of unit cell and is the wavelength. From the Babinet principle, the grid type and patch type have the same resonance point, with opposite filter characteristics. The equation assumes the medium of frequency selective surface (FSS) is a metallic material like perfect electric conductor (PEC) of an infinitely thin film. When we design the periodic pattern for a radome, this equation is useful. but the equation assumes a free-space boundary. When a dielectric slab is added to the FSS layer, the real characteristics of the periodic pattern are changed. In general, the degree of change depends on the dielectric properties and the resonance frequency moves to the low frequency range [2]. The high impedance surface is different from the lossy surface; the periodic pattern is usually made by metal. The pattern controls only the reactive part of the impedance, and the layer is assumed to be thicker than the skin depth. As a result, control of the pattern thickness cannot affect the EM characteristics of the filter. 1.2. Advantage of Periodic-Pattern-Layered RAS (PPRAS) One of the basic models for RAS is the Salisbury absorber, which uses a specific resistive
The Clinical Course of Reverse-flow Anterolateral Thigh Flap: Need to Prepare for Venous Congestion and Salvage Operation
Il-Kug Kim,Tae-Gon Kim,Jun-Ho Lee,Yong-Ha Kim
Archives of Plastic Surgery , 2012, DOI: http://dx.doi.org/10.5999/aps.2012.39.3.262
How Many Presentations Are Published as Full Papers?
Kyu Jin Chung,Jun Ho Lee,Yong Ha Kim,Tae Gon Kim
Archives of Plastic Surgery , 2012, DOI: http://dx.doi.org/10.5999/aps.2012.39.3.238
Abstract: Background The publication rate of presentations at medical international meetings hasranged from 11% to 78% with an average of 45%. To date, there are no studies about thefinal rate of publications at scientific meetings associated with plastic surgery from Korea.The present authors investigated the publication rate among the presentations at meetingsassociated with plastic surgery.Methods The titles and authors of the abstracts from oral and poster presentations werecollected from the program books of the Congress of the Korean Society of Plastic andReconstructive Surgeons (CKSPRS) for 2005 to 2007 (58th-63rd). All of the abstracts presentedwere searched for using PubMed, KoreaMed, KMbase, and Google Scholar. The titles, keywords from the titles, and the authors’ names were then entered in database programs. Theparameters reviewed included the publication rate, type of presentation including runningtime, affiliation, subspecialty, time to publication, and publication journal.Results A total of 1,176 abstracts presented at the CKSPRS from 2005 to 2007 wereevaluated. 38.7% of the abstracts, of which oral presentations accounted for 41.0% and posterpresentations 34.8%, were published as full papers. The mean time to publication was 15.04months. Among journals of publication, the Journal of the Korean Society of Plastic andReconstructive Surgeons was most used.Conclusions Brilliant ideas and innovative approaches are being discussed at CKSPRS. The38.7% publication rate found from this research appeared a bit lower than the average rateof medical meetings. If these valuable presentations are not available as full papers, theresearch would be a waste of time and effort.
The Efficacy of Bioabsorbable Mesh as an Internal Splint in Primary Septoplasty
Jee Nam Kim,Hyun Gon Choi,Soon Heum Kim,Hyung Jun Park
Archives of Plastic Surgery , 2012, DOI: http://dx.doi.org/10.5999/aps.2012.39.5.561
Abstract: Nasal bone fractures are often accompanied by septal fractures or deformity. Posttraumaticnasal deformity is usually caused by septal fractures. Submucosal resection and septoplastyare commonly used surgical techniques for the correction of septal deviation. However, septalperforation or saddle nose deformity is a known complication of submucosal resection. Hence,we chose to perform septoplasty, which is a less invasive procedure, as the primary treatmentfor nasal bone fractures accompanied by septal fractures. During septoplasty, we used abioabsorbable mesh as an internal splint. We used the endonasal approach and inserted themesh bilaterally between the mucoperichondrial flap and the septal cartilage. The treatmentoutcomes were evaluated by computed tomography (CT) and the nasal obstruction symptomevaluation (NOSE) scale. The CT scans demonstrated a significant improvement in the septaldeviation postoperatively. The symptomatic improvement rated by the NOSE scale was greaterat 1 month and 6 months after surgery compared to the preoperative status. There were nocases of extrusion or infection of the implant. In cases of moderate or severe septal deviationwithout dislocation from the vomerine groove on the CT scan, our technique should beconsidered one of the treatments of choice.
Influence of the Alveolar Cleft Type on Preoperative Estimation Using 3D CT Assessment for Alveolar Cleft
Hang Suk Choi,Hyun Gon Choi,Soon Heum Kim,Hyung Jun Park
Archives of Plastic Surgery , 2012, DOI: http://dx.doi.org/10.5999/aps.2012.39.5.477
Abstract: Background The bone graft for the alveolar cleft has been accepted as one of the essentialtreatments for cleft lip patients. Precise preoperative measurement of the architecture andsize of the bone defect in alveolar cleft has been considered helpful for increasing the successrate of bone grafting because those features may vary with the cleft type. Recently, somestudies have reported on the usefulness of three-dimensional (3D) computed tomography(CT) assessment of alveolar bone defect; however, no study on the possible implication of thecleft type on the difference between the presumed and actual value has been conducted yet.We aimed to evaluate the clinical predictability of such measurement using 3D CT assessmentaccording to the cleft type.Methods The study consisted of 47 pediatric patients. The subjects were divided according tothe cleft type. CT was performed before the graft operation and assessed using image analysissoftware. The statistical significance of the difference between the preoperative estimationand intraoperative measurement was analyzed.Results The difference between the preoperative and intraoperative values were -0.1±0.3cm3 (P=0.084). There was no significant intergroup difference, but the groups with a cleftpalate showed a significant difference of -0.2±0.3 cm3 (P<0.05).Conclusions Assessment of the alveolar cleft volume using 3D CT scan data and image analysissoftware can help in selecting the optimal graft procedure and extracting the correct volumeof cancellous bone for grafting. Considering the cleft type, it would be helpful to extract anadditional volume of 0.2 cm3 in the presence of a cleft palate.
Bacterial Inactivation of Wound Infection in a Human Skin Model by Liquid-Phase Discharge Plasma
Paul Y. Kim, Yoon-Sun Kim, Il Gyo Koo, Jae Chul Jung, Gon Jun Kim, Myeong Yeol Choi, Zengqi Yu, George J. Collins
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0024104
Abstract: Background We investigate disinfection of a reconstructed human skin model contaminated with biofilm-formative Staphylococcus aureus employing plasma discharge in liquid. Principal Findings We observed statistically significant 3.83-log10 (p<0.001) and 1.59-log10 (p<0.05) decreases in colony forming units of adherent S. aureus bacteria and 24 h S. aureus biofilm culture with plasma treatment. Plasma treatment was associated with minimal changes in histological morphology and tissue viability determined by means of MTT assay. Spectral analysis of the plasma discharge indicated the presence of highly reactive atomic oxygen radicals (777 nm and 844 nm) and OH bands in the UV region. The contribution of these and other plasma-generated agents and physical conditions to the reduction in bacterial load are discussed. Conclusions These findings demonstrate the potential of liquid plasma treatment as a potential adjunct therapy for chronic wounds.
Korea’s Construction Business Informatization Overview and Future Plans  [PDF]
Myoung Bae Seo, Nam Gon Kim
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.37B003
Abstract: South Korea’s construction industry won orders worth USD 58 billion in 2011, and as such, it has achieved a remarkable growth. However, despite such an impressive quantitative growth, value-added quality growth has been very slow. Thus, the Ministry of Land, Transport and Marine Affairs (MLTM) is pushing ahead with the construction informatization initiative (Construction Continuous Acquisition & Life-cycle Support - CALS) in order to systematically manage a wide range of construction information by stage and to enhance the efficiency of construction costs. This study aims to review the country’s construction CALS to explore a construction development direction. 
Determination and Comparison of Seed Oil Triacylglycerol Composition of Various Soybeans (Glycine max (L.)) Using 1H-NMR Spectroscopy
Won Woo Kim,Ho Sik Rho,Yong Deog Hong,Myung Hun Yeom,Song Seok Shin,Jun Gon Yi,Min-Seuk Lee,Hye Yoon Park,Dong Ha Cho
Molecules , 2013, DOI: 10.3390/molecules181114448
Abstract: Seed oil triacylglycerol (TAG) composition of 32 soybean varieties were determined and compared using 1H-NMR. The contents of linolenic (Ln), linoleic (L), and oleic (O) ranged from 10.7% to 19.3%, 37.4%–50.1%, and 15.7%–34.1%, respectively. As is evident, linoleic acid was the major fatty acid of soybean oil. Compositional differences among the varieties were observed. Natural oils containing unsaturated groups have been regarded as important nutrient and cosmetic ingredients because of their various biological activities. The TAG profiles of the soy bean oils could be useful for distinguishing the origin of seeds and controlling the quality of soybean oils. To the best of our knowledge, this is the first study in which the TAG composition of various soybean oils has been analyzed using the 1H-NMR method.
Detection of Retinitis Pigmentosa by Differential Interference Contrast Microscopy
Juyeong Oh, Seok Hwan Kim, Yu Jeong Kim, Hyunho Lee, Joon Hyong Cho, Young Ho Cho, Chul-Ki Kim, Taik Jin Lee, Seok Lee, Ki Ho Park, Hyeong Gon Yu, Hyuk-jae Lee, Seong Chan Jun, Jae Hun Kim
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0097170
Abstract: Differential interference contrast microscopy is designed to image unstained and transparent specimens by enhancing the contrast resulting from the Nomarski prism-effected optical path difference. Retinitis pigmentosa, one of the most common inherited retinal diseases, is characterized by progressive loss of photoreceptors. In this study, Differential interference contrast microscopy was evaluated as a new and simple application for observation of the retinal photoreceptor layer and retinitis pigmentosa diagnostics and monitoring. Retinal tissues of Royal College of Surgeons rats and retinal-degeneration mice, both well-established animal models for the disease, were prepared as flatmounts and histological sections representing different elapsed times since the occurrence of the disease. Under the microscopy, the retinal flatmounts showed that the mosaic pattern of the photoreceptor layer was irregular and partly collapsed at the early stage of retinitis pigmentosa, and, by the advanced stage, amorphous. The histological sections, similarly, showed thinning of the photoreceptor layer at the early stage and loss of the outer nuclear layer by the advanced stage. To count and compare the number of photoreceptors in the normal and early-retinitis pigmentosa-stage tissues, an automated cell-counting program designed with MATLAB, a numerical computing language, using a morphological reconstruction method, was applied to the differential interference contrast microscopic images. The number of cells significantly decreased, on average, from 282 to 143 cells for the Royal College of Surgeons rats and from 255 to 170 for the retinal-degeneration mouse. We successfully demonstrated the potential of the differential interference contrast microscopy technique’s application to the diagnosis and monitoring of RP.
Design of an Ultra-Wideband Transition from Double-Sided Parallel Stripline to Coplanar Waveguide
Young-Gon Kim,Kang Wook Kim
International Journal of Antennas and Propagation , 2013, DOI: 10.1155/2013/921859
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