http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
OH, WON-CHUN,KIM, BUM-SOO,JANG, WON-CHEOUL,RHEEM, IN-SOO,KIM, JONG-WAN 호서대학교 반도체제조장비국산화연구센터 2000 학술대회 자료집 Vol.2000 No.1
The adsorption isotherms can be assigned to typical Type Ⅰ for Ag and Cu-treated ACFs and Type Ⅰ and Type Ⅱ for Ni-treated ACFs. From the DSC analysis, Ag_0.9-ACF occurs only exothermic curve at the temperature of 203 ℃, and relatively stable composition curves were formed. But Cu_0.3-ACF and Cu_0.4-ACF occur endothermic curves at the temperature of 57.26, 107.02 and 215.87℃. Ni_1.0-ACF occurs large endothermic curves at 59.26, 98.40 and 208.89 ℃ and Ni_0.8-ACF are shown endothermic curves at 59.26 and 157.77 ℃. From the biological results, the percentages of the antibacterial effects were 96.5∼100 for Ag-ACFs, 92.3-99.8 for Cu-ACFs and 95.5∼100 for Ni-ACFs, respectively.
Synthesis of New Prostaglandin F_2α Derivatives
Oh, Chang-Young,Chun, Myung-Hee,Ham, Won-Hun 성균관대학교 약학연구소 1998 成均藥硏論文集 Vol.10 No.1
Prostaglandins (PGs) are naturally occuring substances found in animals and men and biosynthesized from C_20 polyunsaturated fatty acids via a cyclooxygenase enzyme system widely distnbuted in mammalian tissues. PGs were discovered in the 1930s by von Euler but not until 1957 were they isolated and their structures detemined (Bindra. et al.,1977).
Incidence and Risk Factors of Acute Postoperative Delirium in Geriatric Neurosurgical Patients
Oh, Yoon-Sik,Kim, Dong-Won,Chun, Hyoung-Joon,Yi, Hyeong-Joong The Korean Neurosurgical Society 2008 Journal of Korean neurosurgical society Vol.43 No.3
Objective: Postoperative delirium (POD) is characterized by an acute change in cognitive function and can result in longer hospital stays, higher morbidity rates, and more frequent discharges to long-term care facilities. In this study, we investigated the incidence and risk factors of POD in 224 patients older than 70 years of age, who had undergone a neurosurgical operation in the last two years. Methods: Data related to preoperative factors (male gender, >70 years, previous dementia or delirium, alcohol abuse, serum levels of sodium, potassium and glucose, and co-morbidities), perioperative factors (type of surgery and anesthesia, and duration of surgery) and postoperative data (length of stay in recovery room, severity of pain and use of opioid analgesics) were retrospectively collected and statistically analyzed. Results: POD appeared in 48 patients (21.4%) by postoperative day 3. When we excluded 26 patients with previous dementia or delirium, 17 spontaneously recovered by postoperative day 14, while 5 patients recovered by postoperative 2 months with medication, among 22 patients with newly developed POD. The univariate risk factors for POD included previously dementic or delirious patients, abnormal preoperative serum glucose level, pre-existent diabetes, the use of local anesthesia for the operation, longer operation time (>3.2 hr) or recovery room stay (>90 mini, and severe pain (VAS>6.8) requiring opioid treatment (p<0.05). Backward regression analysis revealed that previously dementic patients with diabetes, the operation being performed under local anesthesia, and severe postoperative pain treated with opioids were independent risk factors for POD. Conclusion: Our study shows that control of blood glucose levels and management of pain during local anesthesia and in the immediate postoperative period can reduce unexpected POD and help preventing unexpected medicolegal problems and economic burdens.
Oh, Won-Chun,Son, Joo-Hee,Zhang, Kan,Meng, Ze-Da,Zhang, Feng-Jun,Chen, Ming-Liang 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.1
Activated carbon modified with nickel (Ni-AC) was employed the for preparation of Ni-activated carbon/$TiO_2$ (Ni-AC/$TiO_2$) composites. The $N_2$ adsorption data showed that the composites had a decreased surface area compared with pristine AC. This indicated blocking of the micropores on the surface of the AC, which was further supported by observation via SEM. XRD results showed that the Ni-AC/$TiO_2$ composite contained a mixed anatase and rutile phase while the untreated AC/$TiO_2$ contained only a typical single and clear anatase phase. EDX results showed the presence of C, O, and Ti with Ni peaks on the composites of Ni-AC/$TiO_2$. Subsequently, the photocatalytic effects on methylene blue (MB) were investigated. The improved decomposition of MB showed the combined effects of adsorptions and photo degradation. In particular, composites treated with Ni enhanced the photo degradation behaviors of MB.
Oh, Won-Chun,Lim, Chang-Sung The Korea Association of Crystal Growth 2004 韓國結晶成長學會誌 Vol.14 No.2
The electrochemical adsorption of the Ag ions from aqueous solution on pelletized activated carbon monolith was investigated over wide range of operation time. The adsorption capacities of pelletized activated carbon monolith are associated with their internal porosity and are related properties such as surface area, pore size distribution. The chemical industry generates wastewater that contains toxic matters like heavy metals in small concentrations so that their economic recovery is not feasible. But, the method using activated carbon monolith can be used to withdrawal of heavy metals in waste water. After the electrochemical treatment, the quantitative properties in Ag ion solutions are also examined by pH concentration and studied elemental analysis by ICP-Atomic Emission Spectrometer and Energy Disperse X-ray (EDX) spectra. It is consider that the pH is very important factor at the reason of water pollutant with increasing acidity in industrial field. The result of quantitative analysis using Inductively Coupled Plasma-Atomic Emission Spectrometer of metal after electrochemical reaction in Ag ions solution depending on time are shown that the amount of Ag ions deposited was decreased with growth of Ag particles on the carbon surfaces as increasing electrochemically treated time. And, surface morphologies are investigated by scanning electron microscopy (SEM) to explain the changes in adsorption properties.
Oh, Won-Chun,Jung, Ah-Reum,Ko, Weon-Bae The Korean Society of Analytical Sciences 2007 분석과학 Vol.20 No.2
In this study, we present the preparation and characterization of oxidized fullerene and fullerene dimer [$C_{120}$]. From the XRD data, other weak peaks with pristine fullerene [$C_{60}$] peaks were observed in the X-ray diffraction patterns for fullerene dimer [$C_{120}$]. SEM micrographs for the fullerene dimer [$C_{120}$] indicated that practically all the surface state was shown the drastic morphology changes and its outer surface is clearly visible and resulted in clogging and frost-like formation. From the MALDI-TOF mass spectra, the differences in the spectra recorded on two kinds of fullerene are due to the oxidation including chemical bonding and bridging between the $C_{60}$ molecules. We also obtained additional information from FT-IR spectra on functional component on the chemically modified surface of oxidized fullerene and fullerene dimer [$C_{120}$].
Validation of Human HazChem Array Using VOC Exposure in HL-60 Cells
Oh, Moon-Ju,Kim, Seung-Jun,Kim, Jun-Sub,Kim, Ji-Hoon,Park, Hye-Won,Kim, Youn-Jung,Ryu, Jae-Chun,Hwang, Seung-Yong The Korean Society of Toxicogenomics and Toxicopro 2008 Molecular & cellular toxicology Vol.4 No.1
Volatile Organic Compounds (VOCs) have been shown to cause nervous system disorders through skin contact or respiration, and also cause foul odors even at low densities in most cases. Also, as a compound itself, VOCs are directly harmful to the environment and to the human body, and may participate in photochemical reactions in air to create secondary pollutants. In this study, HL-60 cells were treated with volatile organic compounds, including ethylbenzene and trichloroethylene, at a value of $IC_50$. Then, the in house-prepared Human HazChem arrayer was utilized in order to compare the gene expression between the two VOCs. After hybridization, 8 upregulated genes and 8 downregulated genes were discovered in the HazChem array. The upregulated genes were identified as SG15, TNFSF10, PRNP, ME1, NCOA4, SRXN1, TXNRD1, and XBP1. The downregulated genes were identified as MME, NRF1, PRARBP, CALCA, CRP, BAX, C7 or f40, and FGFR1. Such results were highly correlated with the quantitative RT-PCR results. The majority of the 16 genes were related with the characteristics of VOCs, including respiratory mechanism, apoptosis, and carcinogenesis-associated genes. Our data showed that our human HazChem array can be used to monitor hazardous materials via gene expression profiling.