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( Jun Won Park ),( Dong Jin Ko ),( Jong Jin Yoo ),( Sung Hae Chang ),( Hyon Joung Cho ),( Eun Ha Kang ),( Jin Kyun Park ),( Yeong Wook Song ),( Yun Jong Lee ) 대한내과학회 2014 The Korean Journal of Internal Medicine Vol.29 No.3
Background/Aims: To investigate the rate of detection of monosodium urate (MSU) crystals in the synovial fluid (SF) of patients with acute gouty arthritis and factors associated with false-negative results. Methods: A total of 179 patients with acute gouty arthritis who had undergone SF crystal examination were identified from the data warehouse of two university hospitals. Clinical and laboratory data were obtained from the medical records. Results: The overall rate of detection of MSU crystals was 78.8%. In univariate analyses, the only significant differences between the variables of crystal-negative and crystal-positive patients were a lower C-reactive protein level (p = 0.040) and fewer patients undergoing emergent surgery in the crystal-positive group (p = 4.5 × 10-6). In logistic regression analyses, MSU crystal-negative results were significantly associated with the interval from arthritis onset to crystal examination (p = 0.042), and this was the most significant risk factor for arthroscopic surgery (p = 2.1 × 10-4). Seventeen patients who underwent arthroscopic surgery had a significantly longer hospital stay (p = 0.007) and a significant delay in gout treatment (p = 8.74 × 10-5). The distribution of crystal-negative patients differed significantly between the SF samples that were evaluated by both the laboratory medicine and the rheumatology departments (p = 1.2 × 10-14), and the κ value was 0.108. Conclusions: Although several clinical features were associated with detection failure, SF MSU crystal identification was critically dependent on the observer. Considering the impact on the treatment outcomes, implementation of a quality control program is essential.
Effect of particle size of PtRu nanoparticles embedded in WO3 on electrocatalysis.
Yoo, Sung Jong,Park, Hee Young,Hwang, Seung Jun,Pyo, Sung Gyu,Kim, Soo-Kil,Sung, Yung-Eun,Lim, Tae-Hoon American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.5
<P>Size-controlled PtRu nanoparticles embedded in WO3 were prepared by simultaneous multigun sputtering on pure targets of Pt, Ru, and WO3. The mean diameter of the PtRu nanoparticles, as confirmed by high-resolution transmission electron microscopy, can be varied from -2.3 to -3.6 nm by varying the RF power ratio of PtRu and WO3. On the basis of transmission electron diffraction results for the PtRu nanoparticles embedded in WO3, it was confirmed that PtRu exists as an alloy metal phase, whereas the WO3 matrix is present as an amorphous phase. Size-controlled PtRu/WO3 electrodes were found to exhibit unique electronic properties depending on their size, which affected the potential of zero total charge and the methanol oxidation reaction. The mass activity of PtRu/WO3 for methanol oxidation was determined by the interplay of the surface electronic factors at the metal-solution interface; the oxophilicity of the nanoparticles increased with decreasing particle size.</P>
A Survey of Dental Caries in Mongolia in 2014
Sung-Wook Yun,Seung-Chul Shin,Yeon-Soo Chang,Ho-Kil Kim,Sun-Joo Sohn,Jung-Kyu Kim,Soo-Jung Park,Hyun-Jun Yoo,Ja-Won Cho 대한예방치과학회 2014 International Journal of Clinical Preventive Denti Vol.10 No.3
Objective: The authors had conducted the oral health survey of Mongolian people with dual methods as direct oral examination by trained dentists and indirect method through taking the intra oral photos of the subjects by use of Nikon digital camera, in order to interpretate the image for finding the caries states of the subject people. Methods: One thousand three hundred seven persons of subject were examined in this dental survey, and classified with age distribution as 5, 9, 12, 15, 20s, 40s, and 60s years old at urban area of Ulaanbaatar area and the others at the rural areas at Bornuur as steppe area and at Mandalgovi as desert area. Results: Primary decayed tooth (dt), primary filled tooth (ft), and primary decayed, filled tooth (dft) index of Mongolian 5 years old were calculated as 6.25±4.56, 1.09±2.17, and 7.34±4.69 as high in caries incidence without treatment. Permanent decayed tooth (DT), permanent filled tooth (FT), permanent decayed, missing, filled tooth (DMFT) index of Mongolian 12 years old were as 2.37±2.76, 0.29±0.93 and 2.93±3.11, as high caries incidence without early treatment, and 12.1% of DMFT rate, 77.7% of DMF rate as the most children have been caries experienced. Conclusion: Oral health promotion and early treatment of caries in public oral health plan were recommended to promote the oral health level of Mongolian people.
Design of GPCA Structure Based on Quantum-Dot Cellular Automata
Sang-Ho Shin,Young-Won Yoo,Ju-Hee Park,Jun-Cheol Jeon 한국정보통신학회 2014 2016 INTERNATIONAL CONFERENCE Vol.6 No.1
In this paper, we propose a design of general programmable cellular automata(GPCA) structure based on quantum-dot cellular automata(QCA). In the proposed GPCA structure, we utilize the previous D flip-flop and XOR logic gate, and propose wire connecting logic and rule control logic for the first time. In experiment, we simulate the GPCA design by using QCADesigner, compare and analyze the simulation result in order to evaluate the efficiency of the proposed GPCA structure.
Yoo, Joo Young,Song, Sung Jin,Kim, Chang Hwan,Jung, Hee Jun,Choi, Young Hwan,Kang, Suk Chull,Jung, Hyun Kyu Trans Tech Publications, Ltd. 2006 Key Engineering Materials Vol.321 No.-
<P>In the present study, the synthetic signals from the combo tube are simulated by using commercial electromagnetic numerical analysis software which has been developed based on a volume integral method. A comparison of the simulated signals to the experiments is made for the verification of accuracy, and then evaluation of five deliberated single circumferential indication signals is performed to explore a possibility of using a numerical simulation as a practical calibration tool. The good agreement between the evaluation results for two cases (calibration done by experiments and calibration made by simulation) demonstrates such a high possibility.</P>