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李殷雄,金宗謙 忠南大學校 産業技術硏究所 1991 산업기술연구논문집 Vol.6 No.2
In recent year, vacuum circuit breakers (VCB) have been widely used as the power supply breaker of high voltage motors, to enhance the efficiency and to make the maintenance of waterworks equipments easy. Poweful surge voltage, a repetitive phenomenon of reignition, occured when the VCB is switching between on and off, and is transmitted to the stator winding of motor through the cable. This surge voltage is repeated several times, though the action of the circuit breaker (CB) is not completed, and if the suge voltage is culmulated, the motor becomes burned by owing to breakdown of winding at the end. In this study, the surge voltage occuring at the opening and closing of the VCB was analyzed as the transient phenomenon by circuit parameters. By examining the variances of peak value, duration of wave-front, and duration of wave-tail under the variances of length and capacity of the cable, we could expect to protect the breakdown of winding with parallel connection of suitable capacitance in the motor.
KIM, Jae Kyeom,BAE, Heyri,KIM, Mi-Jeong,CHOI, Soo Jung,CHO, Hong Yon,HWANG, Han-Joon,KIM, Young Jun,LIM, Seung Taik,KIM, Eun Ki,KIM, Hye Kyung,KIM, Bok Yong,SHIN, Dong-Hoon Japan Society for Bioscience, Biotechnology, and A 2009 Bioscience, biotechnology, and biochemistry Vol.73 No.5
<P>Various native Korean plants were screened to find an effective acetylcholinesterase (AChE) inhibitor for the treatment of Alzheimer’s disease (AD). Among these plants, the ethanol extract of <I>Poncirus trifoliate</I> was selected for isolating the AChE inhibitor because it exhibited the highest inhibitory activity (47.31%). To separate the active compound from <I>Poncirus trifoliate</I>, solvent partition, open column chromatography, thin-layer chromatography (TLC), and high-performance liquid chromatography (HPLC) were utilized. The putative chemical structure of the AChE inhibitor was identified as <I>methoxsalen</I> by successive analysis with electron ionization mass spectrometry (EI-MS) and <SUP>13</SUP>C/<SUP>1</SUP>H-nuclear magnetic resonance (NMR). To confirm the attenuating effect of the <I>Poncirus trifoliate</I> extract against trimethyltin (TMT)-induced neurotoxicity, <I>in vivo</I> behavior tests were carried out. Our findings suggest that the <I>Poncirus trifoliate</I> extract significantly reversed TMT-induced learning and memory impairment. These results demonstrate that the <I>Poncirus trifoliate</I> extract could possess a wide range of beneficial activities for neurodegenerative disorders, notably AD.</P>
( Eun Sun Kim ),( Eun Young Heo ),( Deog Kyeom Kim ),( Hee Soon Chung ),( Sung Soo Park ) 대한결핵 및 호흡기학회 2014 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.118 No.-
Background: Pulmonary tuberculosis (TB) is different from bacterial pneumonia in terms of patient demographic characteristics, use of antimicrobial agents, and treatment environment such as air-borne precaution and isolation. We hypothesized that the prevalence of multi-drug resistant organisms (MDRO) might be different in patients with TB from that of community acquired pneumonia (CAP) among critically ill patients. Methods: All TB or CAP patients admitted to the intensive care unit (ICU) of the hospital in Korea from January 2009 to July 2014 were included. Patients were excluded from the study if there was a prior history of MDRO, hospitalization for =2 days in the preceding 90 days, or antimicrobial therapy in the preceding 30 days. The patients admitted ICU due to other than respiratory failure were also excluded. Results: 26 TB patients and 43 CAP patients were included in the study. Compared with CAP group, the TB group was younger and had less comorbidities. Duration of delay to ICU admission and/or initiation of effective medication were longer in patients with TB. The prevalence of MDRO colonization was not different in both groups (26.9% in TB group and 27.9% in CAP group) and multi-drug resistant Acinetobacter baumanii was the most frequently isolated MDRO (21.7%). The rate of ventilator associated pneumonia (VAP) in TB group (23.1%) was also similar to that of CAP group (16.3%). The proportion of ARDS and multi-organ failure were higher in patients with TB. 18 (69.2%) and 15 (34.9%) patients were dead in TB and CAP group, respectively. Conclusions: The prognosis of patients with TB requiring intensive care was worse than the patients with severe CAP in ICU. However, the prevalence of MDRO colonization and rate of VAP were not different in both group of patients.
Kim, Yee Hyung,Yoo, Kwang Ha,Yoo, Jee-Hong,Kim, Tae-Eun,Kim, Deog Kyeom,Park, Yong Bum,Rhee, Chin Kook,Kim, Tae-Hyung,Kim, Young Sam,Yoon, Hyoung Kyu,Um, Soo-Jung,Park, I-Nae,Ryu, Yon Ju,Jung, Jae-Woo The Korean Academy of Tuberculosis and Respiratory 2017 Tuberculosis and Respiratory Diseases Vol.80 No.2
Background: The purpose of this study was to assess the effect of our new video-assisted asthma education program on patients' knowledge regarding asthma and asthma control. Methods: Adult asthmatics who were diagnosed by primary care physicians and followed for at least 1 year were educated via smart devices and pamphlets. The education sessions were carried out three times at 2-week intervals. Each education period lasted at most 5 minutes. The effectiveness was then evaluated using questionnaires and an asthma control test (ACT). Results: The study enrolled 144 patients (mean age, $56.7{\pm}16.7years$). Half of the patients had not been taught how to use their inhalers. After participating in the education program, the participants' understanding of asthma improved significantly across all six items of a questionnaire assessing their general knowledge of asthma. The proportion of patients who made errors while manipulating their inhalers was reduced to less than 10%. The ACT score increased from $16.6{\pm}4.6$ to $20.0{\pm}3.9$ (p<0.001). The number of asthmatics whose ACT score was at least 20 increased from 45 (33.3%) to 93 (65.3%) (p<0.001). The magnitude of improvement in the ACT score did not differ between patients who received an education session at least three times within 1 year and those who had not. The majority of patients agreed to the need for an education program (95.8%) and showed a willingness to pay an additional cost for the education (81.9%). Conclusion: This study indicated that our newly developed education program would become an effective component of asthma management in primary care clinics.
Nonvolatile Memory Characteristics of Double-Stacked Si Nanocluster Floating Gate Transistor
Kim, Eun-Kyeom,Kim, Kyong-Min,Son, Dae-Ho,Kim, Jeong-Ho,Lee, Kyung-Su,Won, Sung-Hwan,Sok, Jung-Hyun,Hong, Wan-Shick,Park, Kyoung-Wan The Institute of Electronics and Information Engin 2008 Journal of semiconductor technology and science Vol.8 No.1
We have studied nonvolatile memory properties of MOSFETs with double-stacked Si nanoclusters in the oxide-gate stacks. We formed Si nanoclusters of a uniform size distribution on a 5 nm-thick tunneling oxide layer, followed by a 10 nm-thick intermediate oxide and a second layer of Si nanoclusters by using LPCVD system. We then investigated the memory characteristics of the MOSFET and observed that the charge retention time of a double-stacked Si nanocluster MOSFET was longer than that of a single-layer device. We also found that the double-stacked Si nanocluster MOSFET is suitable for use as a dual-bit memory.
Quantitative light-induced fluorescence technology for quantitative evaluation of tooth wear
Kim, Sang-Kyeom,Lee, Hyung-Suk,Park, Seok-Woo,Lee, Eun-Song,de Josselin de Jong, Elbert,Jung, Hoi-In,Kim, Baek-Il SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS 2017 JOURNAL OF BIOMEDICAL OPTICS Vol.22 No.12
<P>Various technologies used to objectively determine enamel thickness or dentin exposure have been suggested. However, most methods have clinical limitations. This study was conducted to confirm the potential of quantitative light-induced fluorescence (QLF) using autofluorescence intensity of occlusal surfaces of worn teeth according to enamel grinding depth in vitro. Sixteen permanent premolars were used. Each tooth was gradationally ground down at the occlusal surface in the apical direction. QLF-digital and swept-source optical coherence tomography images were acquired at each grinding depth (in steps of 100 mu m). All QLF images were converted to 8-bit grayscale images to calculate the fluorescence intensity. The maximum brightness (MB) values of the same sound regions in grayscale images before (MBbaseline) and phased values after (MBwom) the grinding process were calculated. Finally, 13 samples were evaluated. MBwom increased over the grinding depth range with a strong correlation (r = 0.994, P < 0.001). In conclusion, the fluorescence intensity of the teeth and grinding depth was strongly correlated in the QLF images. Therefore, QLF technology may be a useful non-invasive tool used to monitor the progression of tooth wear and to conveniently estimate enamel thickness. (C) 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)</P>
( Eun Sun Kim ),( Eun Young Heo ),( Deog Kyeom Kim ),( Hee Soon Chung ),( Sung Soo Park ) 대한내과학회 2014 대한내과학회 추계학술발표논문집 Vol.2014 No.1
Background: Pulmonary tuberculosis (TB) is different from bacterial pneumonia in terms of patient demographic characteristics, use of antimicrobial agents, and treatment environment such as air-borne precaution and isolation. We hypothesized that the prevalence of multi-drug resistant organisms (MDRO) might be different in patientswith TB from that of community acquired pneumonia (CAP) among critically ill patients. Methods: All TB or CAP patients admitted to the intensive care unit (ICU) of the hospital in Korea from January 2009 to July 2014 were included. Patients were excluded from the study if there was a prior history of MDRO, hospitalization for =2 days in the preceding 90 days, or antimicrobial therapy in the preceding 30 days. The patients admitted ICU due to other than respiratory failure were also excluded. Results: 26 TB patients and 43 CAP patients were included in the study. Compared with CAP group, the TB group was younger and had less comorbidities. Duration of delay to ICU admission and/or initiation of effective medication were longer in patients with TB. The prevalence of MDRO colonization was not different in both groups (26.9% in TB group and 27.9% in CAP group) and multi-drug resistant Acinetobacter baumanii was the most frequently isolated MDRO (21.7%). The rate of ventilator associated pneumonia (VAP) in TB group (23.1%) was also similar to that of CAP group (16.3%). The proportion of ARDS and multi-organ failure were higher in patients with TB. 18 (69.2%) and 15 (34.9%) patients were dead in TB and CAP group, respectively. Conclusions: The prognosis of patients with TB requiring intensive care was worse than the patients with severe CAP in ICU. However, the prevalence of MDRO colonization and rate of VAP were not different in both group of patients.
Ipomoea batatas Attenuates Amyloid β Peptide-Induced Neurotoxicity in ICR Mice
Jae Kyeom Kim,Soo Jung Choi,Hong Yon Cho,Young Jun Kim,Seung-Taik Lim,김창주,Eun Ki Kim,Hye Kyung Kim,Sabrina Peterson,신동훈 한국식품영양과학회 2011 Journal of medicinal food Vol.14 No.3
In this study, the protective effects of 17 Korean native plants against amyloid β peptide (Aβ)-induced oxidative stress were screened using the 2′,7′-dichlorofluorescin diacetate assay and the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay. Ipomoea batatas exerted the highest protective effects against oxidative stress and was selected for further investigation. To confirm the protective activity of this extract, the I. batatas extract was fed to ICR mice that had been injected with Aβ to induce neuronal deficits. In these experiments, the extract of I. batatas significantly reversed Aβ-induced neurotoxicity as assessed by the passive avoidance test, a behavioral experiment. Moreover, I. batatas administration reduced the level of lipid peroxidation and increased catalase activities in biochemical studies using the brain tissue of mice. These results indicate that I. batatas might be beneficial against Alzheimer's disease, especially by limiting oxidative stress in the brain.