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Search Results: 1 - 10 of 27769 matches for " Joon-Sung Lee "
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Atomic position localization via dual measurement
Hyunchul Nha,Jai-Hyung Lee,Joon-Sung Chang,Kyungwon An
Physics , 2001, DOI: 10.1103/PhysRevA.65.033827
Abstract: We study localization of atomic position when a three-level atom interacts with a quantized standing-wave field in the Ramsey interferometer setup. Both the field quadrature amplitude and the atomic internal state are measured to obtain the atomic position information. It is found that this dual measurement scheme produces an interference pattern superimposed on a diffraction-like pattern in the atomic position distribution, where the former pattern originates from the state-selective measurement and the latter from the field measurement. The present scheme results in a better resolution in the position localization than the field-alone measurement schemes. We also discuss the measurement-correlated mechanical action of the standing-wave field on the atom in the light of Popper's test.
Observation of Scarred Modes in Asymmetrically Deformed Microcylinder Lasers
Sang-Bum Lee,Jai-Hyung Lee,Joon-Sung Chang,Hee-Jong Moon,Sang Wook Kim,Kyungwon An
Physics , 2001, DOI: 10.1103/PhysRevLett.88.033903
Abstract: We report observation of lasing in the scarred modes in an asymmetrically deformed microcavity made of liquid jet. The observed scarred modes correspond to morphology-dependent resonance of radial mode order 3 with their Q values in the range of 10^6. Emission directionality is also observed, corresponding to a hexagonal unstable periodic orbit.
Difference of clinical features in childhood Mycoplasma pneumoniae pneumonia
You-Sook Youn, Kyung-Yil Lee, Ja-Young Hwang, Jung-Woo Rhim, Jin-Han Kang, Joon-Sung Lee, Ji-Chang Kim
BMC Pediatrics , 2010, DOI: 10.1186/1471-2431-10-48
Abstract: The diagnosis of MP was made by examinations at both admission and discharge and by two serologic tests: the indirect microparticle agglutinin assay (≥1:40) and the cold agglutinins titer (≥1:32). A total of 191 children with MP were grouped by age: ≤2 years of age (29 patients), 3-5 years of age (81 patients), and ≥6 years of age (81 patients). They were also grouped by pneumonia pattern: bronchopneumonia group (96 patients) and segmental/lobar pneumonia group (95 patients).Eighty-six patients (45%) were seroconverters, and the others showed increased antibody titers during hospitalization. Among the three age groups, the oldest children showed the longest duration of fever, highest C-reactive protein (CRP) values, and the most severe pneumonia pattern. The patients with segmental/lobar pneumonia were older and had longer fever duration and lower white blood cell (WBC) and lymphocyte counts, compared with those with bronchopneumonia. The patient group with the most severe pulmonary lesions had the most prolonged fever, highest CRP, highest rate of seroconverters, and lowest lymphocyte counts. Thrombocytosis was observed in 8% of patients at admission, but in 33% of patients at discharge.In MP, older children had more prolonged fever and more severe pulmonary lesions. The severity of pulmonary lesions was associated with the absence of diagnostic IgM antibodies at presentation and lymphocyte count. Short-term paired IgM serologic test may be mandatory for early and definitive diagnosis of MP.Mycoplasma pneumoniae (M. pneumoniae) is an important causative organism of respiratory infections in children and young adults. M. pneumoniae pneumonia (MP) has been reported in 10-40% of community-acquired pneumonia cases, and recent studies have indicated that younger children (<5 years of age), as well as school-aged children, are prone to M. pneumoniae infection [1-6]. In Korea, M. pneumoniae epidemics have occurred every 3-4 years since the 1980s; in the most recent epidem
The Outcome of the Chemotherapy and Oncothermia for Far Advanced Adenocarcinoma of the Lung: Case Reports of Four Patients  [PDF]
Doo Yun Lee, Joon Seok Park, Hae Chul Jung, Eun Seol Byun, Seok Jin Haam, Sung Soo Lee
Advances in Lung Cancer (ALC) , 2015, DOI: 10.4236/alc.2015.41001

Lung cancer is one of the most aggressive and lethal form of cancers. Patients with far advanced lung cancer are treated by chemotherapy with or without radiotherapy. However, median survival of these patients is less than 6 months. To increase survival and quality of life for these patients, various forms of complementary treatments have been tried in clinical practices, and oncothermia is supposed to be one of the promising candidates. From May 2008 to November 2013, 4 patients with far advanced lung adenocarcinoma (stages IIIB and IV) were treated with oncothermia in addition to conventional chemotherapy at Gangnam Severance Hospital and Bundang CHA Hospital. All these patients have survived for more than 2 years.

Clinical risk factors for Clostridium difficile-associated diseases
Cho, Sung Min;Lee, Jae Joon;Yoon, Hee Jung;
Brazilian Journal of Infectious Diseases , 2012, DOI: 10.1590/S1413-86702012000300007
Abstract: many factors appear to influence the chance of acquiring clostridium difficile (c. difficile) infection, and an accurate identification of risk factors could be beneficial in many ways. thus, in the present study, clinical risk factors for c. difficile-associated disease (cdad) in korea were identified. a total of 93 patients who met the inclusion criteria and 186 age/gender/ward/admission period-matched control patients were included in this study. statistically significant associations were found with presence of chronic lung diseases (odds ratio [or], 3.41; 95% confidence interval [ci], 1.25-9.32; p = 0.017), presence of ileus (or, 10.05; 95% ci, 2.42-41.80; p = 0.001), presence of intensive care unit (icu) stay (or, 9.79; 95% ci, 3.03-31.68; p < 0.001), use of cephalosphorins (or, 3.30; 95% ci, 1.13-9.62; p = 0.029), history of surgery (or, 10.89; 95% ci, 3.96-29.92; p < 0.001), and history of long-term care facility stay (or, 14.90; 95% ci, 4.02-55.26; p < 0.001). awareness of cdad is critical to provide appropriate clinical care. surveillance of the national incidence rate and multicenter studies are needed, and the potential value of a c. difficile vaccine should be studied.
Effect of Threshold Value on the Performance of Natural Frequency-Based Radar Target Recognition
Sung-Woo Cho;Joon-Ho Lee
PIER , 2013, DOI: 10.2528/PIER12103104
Abstract: In this paper, the performance analysis of the natural frequency-based radar target recognition in the time domain is considered. We investigate the dependence of the probability of correct classification on a specific threshold value, and determine the optimum threshold value for two targets, and the sub-optimal threshold for multiple targets to maximize the probability of correct classification. Based on the probability density function (PDF) of some quantity consisting of the projections of the late time response onto the column spaces of the matrices constructed using the natural frequencies of the specific targets, we propose how to determine an optimum threshold in the sense that the probability of correct classification of two targets is maximized. By extending the scheme for two targets, we show how to determine a threshold value close to the optimal threshold for multiple targets. The scheme is validated by comparing the performance using the analytic method with that using the Monte-Carlo simulation.
Efficient Implementation of the Capon Beamforming Using the Levenberg-Marquardt Scheme for Two Dimensional Aoa Estimation
Sung-Woo Cho;Joon-Ho Lee
PIER , 2013, DOI: 10.2528/PIER12122711
Abstract: In this paper, we adopt the Levenberg-Marquardt (LM) algorithm to implement the nonlinear multivariable optimization for azimuth/elevation angle-of-arrival (AOA) estimation based on the Capon beamforming algorithm. The formulation is based on the fact that the cost function of the Capon algorithm can be expressed in a least-squares form. The performance in terms of the root mean square error (RMSE) and the computational complexity is illustrated via numerical results.
Gold Nanoparticle Contrast Agents in Advanced X-ray Imaging Technologies
Sungsook Ahn,Sung Yong Jung,Sang Joon Lee
Molecules , 2013, DOI: 10.3390/molecules18055858
Abstract: Recently, there has been significant progress in the field of soft- and hard-X-ray imaging for a wide range of applications, both technically and scientifically, via developments in sources, optics and imaging methodologies. While one community is pursuing extensive applications of available X-ray tools, others are investigating improvements in techniques, including new optics, higher spatial resolutions and brighter compact sources. For increased image quality and more exquisite investigation on characteristic biological phenomena, contrast agents have been employed extensively in imaging technologies. Heavy metal nanoparticles are excellent absorbers of X-rays and can offer excellent improvements in medical diagnosis and X-ray imaging. In this context, the role of gold (Au) is important for advanced X-ray imaging applications. Au has a long-history in a wide range of medical applications and exhibits characteristic interactions with X-rays. Therefore, Au can offer a particular advantage as a tracer and a contrast enhancer in X-ray imaging technologies by sensing the variation in X-ray attenuation in a given sample volume. This review summarizes basic understanding on X-ray imaging from device set-up to technologies. Then this review covers recent studies in the development of X-ray imaging techniques utilizing gold nanoparticles (AuNPs) and their relevant applications, including two- and three-dimensional biological imaging, dynamical processes in a living system, single cell-based imaging and quantitative analysis of circulatory systems and so on. In addition to conventional medical applications, various novel research areas have been developed and are expected to be further developed through AuNP-based X-ray imaging technologies.
Current status of bioartificial kidney  [PDF]
Sung Joon Shin
Journal of Biomedical Science and Engineering (JBiSE) , 2014, DOI: 10.4236/jbise.2014.73014

Current dialysis systems are not perfect considering the low efficacy and cumbersome process of actual practice. To overcome these shortcomings, bioartificial kidneys using renal tubule cells and wearable dialysis are promising ESRD treatments available in the near future. Toward clinical application, however, there are so many obstacles for commercial use of them. In this review, current status of bioartificial kidneys such as the renal tubule cell assist device (RAD) and wearable dialysis devices is presented with the comparison to show the advantages and disadvantages.

Combined Rotation and Advancement Flap Reconstruction for a Defect of the Upper Lip: 2 Cases
Junsang Lee,Suk Joon Oh,Sung Won Jung,Sung Hoon Koh
Archives of Plastic Surgery , 2012, DOI: http://dx.doi.org/10.5999/aps.2012.39.3.244
Abstract: Many types of upper lip reconstruction have been introduced to treat defects after a tumorexcision or trauma. The authors treated two cases of upper lip defects. A 35-year-old womanpresented with a squamous cell carcinoma of the left upper lip that had invaded the cornerof the mouth. After resecting the tumor, the defect was 3.7×3.5 cm in size. A 52-year-oldwoman presented with a dog bite of the right upper lip. The defect measured 4.0×2.2 cm insize. The two cases were reconstructed by combined rotation and advancement of a cheekflap. This technique produced a good functional outcome that allowed for oral competenceand created an opening of adequate size. A combination of rotation and an advancementflap can be used to treat upper lip defects in a single-stage procedure. This approach producesa good functional and cosmetic outcome.
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