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상수원수 수질변화에 따른 전오존 처리효과 및 경제성 평가
최동훈 ( Dong Hoon Choi ),박진식 ( Jin Sik Park ),문추연 ( Choo Yeun Moon ),이재용 ( Jae Yong Lee ),유동춘 ( Dong Choon Ryu ),장성호 ( Seong Ho Jang ),권기원 ( Ki Won Kwon ),이수애 ( Soo Ae Lee ) 한국환경과학회 2013 한국환경과학회지 Vol.22 No.4
This study, changes in raw water quality is to indicate on the efficiency of ozone treatment of each pollutant as compared to derive the appropriate operating measures. The appropriate selection for injection rate of pre-ozone and did not inject pre-ozone assess changes in the water. When good water quality, you not injected of pre-ozone to evaluate the economic efficiency of electricity and put the most cost-effective ozone concentration were evaluated. Evaluation remove organic matter and chlorophyll-a concentration level in experiments with each factor of the water DOC> 2.5㎎ / L, THMFP> 70㎍ / L, Chl-a> 30㎎/㎥or less constant process, if you do not need to put pre-ozone showed little impact. It also does not put you in pre-ozone appropriate produce enough power rate savings was calculated as approximately 90 million won. Ability to remove organic materials and the ability to produce disinfection byproducts, and cost-effective decisions by considering the concentration of injection if pre-ozone 1 mg/L was investigated by the appropriate concentration of ozone injection.
( Jae Yong Yoon ),( Hyun Jun Cho ),( Kyun Hee Kim ),( Won Suk Choi ),( Sun Hee Park ),( Myung Hwan Bae ),( Jang Hoon Lee ),( Dong Heon Yang ),( Hun Sik Park ),( Yongkeun Cho ),( Shung Chull Chae ),( J 대한내과학회 2011 대한내과학회 추계학술대회 Vol.2011 No.1
Background: The aims of this study were to determine (1) the prevalence of an abnormal ankle brachial index (ABI; <0.90) and (2) the association of serum high sensitive C-reactive protein (hs-CRP), a marker of systemic inflammation, with the abnormal ABI in asymptomatic older adults (>50 years old). Methods: Study subjects were 1,271 Koreans (263 males; mean age=65.8±8.5 year-old) in a rural area in Daegu city, Korea. They were enrolled from August to November 2008 for a cohort study. The ABI was performed after subjects rested for at least 10 minutes in a supine position. Study subjects were classified into a low (ABI <0.9) and normal ABI group. Baseline levels of serum hs-CRP were measured by immunoturbidimetric assay. Results: Of 1,271 asymptomatic older adults, 42 (3.3%) had a lower ABI. Based on univariate analysis for low ABI, age, gender, body mass index, systolic blood pressure, status of smoking, diabetes mellitus, and serum level of uric acid were significantly related to a lower ABI. Baseline hs-CRP levels were significantly higher in low ABI group compared to normal ABI group (2.34±2.41 mg/L versus 1.46±1.38 mg/L, p=0.023). Baseline hs-CRP levels were significantly negatively correlated with ABI (r=-0.142, p<0.001). In multivariate analysis log transformed hs-CRP (odds ratio [OR] 2.639, 95% confidence interval [CI] 1.026-6.787; p=0.044) in addition to age(OR 1.082, 95% CI 1.035-1.131; p=0.001) were independent predictors of low ABI after adjusting for gender, body mass index, systolic blood pressure, status of smoking, diabetes mellitus, and serum level of uric acid. The likelihood ratio test showed that hs-CRP added incremental value to the combination of serum uric acid concentrations and conventional risk factors in predicting low ABI. Conclusions: This study provides evidence that baseline levels of hs-CRP are modestly associated with low ABI. These data suggest that inflammation may have a potentially important role in part in the development of peripheral vascular disease in asymptomatic older adults.
( Jae Gyung Kim ),( Beom June Kwon ),( Kyu Young Choi ),( Dong Bin Kim ),( Jang Sung Won ),( Eun Ju Cho ),( Jae Hyung Kim ) 대한내과학회 2011 대한내과학회 추계학술대회 Vol.2011 No.1
Purpose: We designed a prospective study to identify the impacts of antihypertensive therapy on dyssynchrony in patients with never-treated hypertension. Method: Sixty patients of never-treated hypertension (53.3% men, mean age 54.3±9.7 years) underwent echocardiographic evaluations of dyssynchrony at baseline and after 6 months of antihypertensive therapy. Measured parameters were as follows:(1) standard deviation (SD) of time from ECG Q to systolic peak velocity of 12 Left ventricular (LV) segments (ms, Ts-SD12) and maximum difference of time to systolic peak velocity among 12 LV segments (ms, Ts-Max) (systolic dyssynchrony); (2) SD of time from ECG Q to early diastolic peak velocity of 12 LV segments (ms, Te-SD12) and maximum difference of time to early diastolic velocity among 12 LV segments (ms, Te-Max) (diastolic dyssynchrony); (3) LV mass index (g/m2). Patients with systolic dyssynchrony (group 1, N=29) and without systolic dyssynchrony (group 2, N=31)at baseline were compared. Results: The changes of echocardiographic parameters were summarized in the table. In group 1 patients, systolic (Ts-SD12, Ts-Max) and diastolic (Te-Max) dyssynchrony, and LV mass index (LVMI) significantly improved after antihypertensive therapy. Conclusion: The present study confirmed that chronic antihypertensive treatment significantly reverses LV systolic dyssynchrony.
Test and Evaluation Procedure of Foam Core Materials for Composite Ships
Jae-Won Jang,Sookhyun Jeong,Daekyun Oh,Je-Hyoung Cho,Jackyou Noh 해양환경안전학회 2020 海洋環境安全學會誌 Vol.26 No.3
Sandwich structures are general-purpose structures that can reduce the structural weight of composite ships. Core materials are essential for these structures, with polyvinyl chloride (PVC) foams being the most popular. These foam core materials are subjected to various tests in the development process, and must satisfy the performance requirements of several ISO and ASTM standards. Therefore, a procedure for evaluating the performance of foam core materials was proposed in this paper. In addition, prototypes were fabricated using a commercial PVC foam core product in accordance with the structural design of an 11 m fiber-reinforced plastic yacht. Then, a case study was conducted on the proposed evaluation procedure. The proposed procedure facilitates the understanding of the performance requirements and evaluation of core materials used in composite ships and is expected to be utilized in developing core materials for marine structures.
Effect of Bacillus subtilis S37-2 on Microorganisms in Soil and Growth of Lettuce (Lactuca sativa)
Jae-Young Heo,Dae-Ho Kim,Yong-Jo Choi,Sang-Dae Lee,Su-Won Seuk,Jae-Kyeong Song,Jang-Sik Kwon,Min-Keun Kim 한국토양비료학회 2016 한국토양비료학회지 Vol.49 No.5
The present study evaluated the variations in soil microbial population of controlled horticultural land used for lettuce (Lactuca sativa) cultivation by their fatty acid methyl ester and chemical properties. We utilized four treatment groups, no treatment (NT), culture medium (CM), Bacillus subtilis S37-2 (KACC 91281P) × 10<SUP>6</SUP> CFU mL<SUP>-1</SUP>(BS1), and Bacillus subtilis S37-2 × 10<SUP>7</SUP> CFU mL-1(BS2) and analyzed these variations throughout the before treatment and harvesting stage. The chemical properties such as pH, organic matter, available phosphate, and electrical conductivity in soils before treatment and harvesting stage showed no significant difference among the treatments. Total numbers of bacteria and microbial biomass C in soil treated with BS1 were larger than those of NT, CM, and BS2, whereas total number of fungi at the harvesting stage was significantly lower in the BS1 soil than in the NT and CM soils (P < 0.05). On basis of leaf length, leaf width, leaf number and leaf weight, the growth characteristics lettuce on the soil treated with BS1 and BS2 was faster than those of NT and CM soils. Yield of lettuce with treated BS1 and BS2 were 35% and 29% more than that of NT, respectively.
Jang, Jae-Myung,Jeong, Byeong-Ho,Kim, Young-Rae,Shin, Dae-Hyun,Kim, Seung-Hee,Chung, Sang-Won,Choe, Han-Cheol American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.6
<P>The Ultra-fine HAp nanoparticles (spherical protrusion) synthesized onto TiO2 barrier oxide film have been shown to exhibit desirable properties as biocompatible or unusual coating layer. The numerous spherical morphologies depending on progress of anodizing time were gradually appeared to the surface whole area. TiO2 barrier oxide film formed by electrochemical method was composed of characteristics laminated structure including the HAp nanoparticles of 7 similar to 10 nm in diameter. The results of EDS (Energy Dispersive Spectroscopy) line analysis, the elements existing TiO2 barrier oxide film reveal that molar ratio of Ca/P is about 1.615, which is very closed to the Ca/P molar ratio in Ca-10(PO4)(6)(OH)(2): 1.67. The incorporated phosphate species were found mostly in the forms of HPO4-, PO4-, and PO3-, which were penetrated from the electrolyte into the TiO2 barrier layer during anodic process. After 6 and 8 days of soaking in SBF, the HAp nanoparticles (spherical protrusion) were nearly covered with the granular structures, and displayed more micro-cracks on the surface. The Ca/P atomic ratio of the HAp coating was exactly 1.67, as was expected by stoichiometric composition of HA (Ca-10(PO4)(6)(OH)(2)). Thus, it is clearly suggested that these structures of TiO2 barrier oxide film are all effective for biocompatibility.</P>
Geometric Sensitivity Index for the GNSS Using Inner Products of Line of Sight Vectors
Won, Dae Hee,Ahn, Jongsun,Sung, Sangkyung,Lee, Chulsoo,Bu, Sungchun,Jang, Jeagyu,Lee, Young Jae The Korean Society for Aeronautical and Space Scie 2015 International Journal of Aeronautical and Space Sc Vol.16 No.3
Satellite selection and exclusion techniques have been applied to the global navigation satellite system (GNSS) with the aim of achieving a balance between navigational performance and computational efficiency. Conventional approaches to satellite selection based on the best dilution of precision (DOP) are excessively computational and complicated. This paper proposes a new method that applies a geometric sensitivity index of individual GNSS satellites. The sensitivity index is derived using the inner product of the line of sight (LOS) vector of each satellite. First, the LOS vector is computed, which accounts for the geometry between the satellite and user positions. Second, the inner product of each pair of LOS vectors is calculated, which indicates the proximities of the satellites to one another. The proximity can be determined according to the sensitivity of each satellite. A post-processing test was conducted to verify the reliability of the proposed method. The proposed index and the results of a conventional approach that measures the dilution of precision (DOP) were compared. The test results demonstrate that the proposed index produces results that are within 96% of those of the conventional approach and reduces the computational burden. This index can be utilized to estimate the sensitivity of individual satellites, obtaining a navigation solution. Therefore, the proposed index applies to satellite selection and exclusion as well as to the sensitivity analyses of multiple GNSS applications.
Jang, Jae Kwon,Park, Se Ho,Kim, Chulwoo,Ko, Jaejung,Seo, Won Seok,Song, Hyunjoon,Park, Joon T IOP Pub 2011 Nanotechnology Vol.22 No.27
<P>Rational organization of porphyrin and C<SUB>60</SUB> on the electrode surface in photovoltaic structures is essential to yield high quantum efficiency. In the present work, individual TiO<SUB>2</SUB> nanoparticles were modified by introducing C<SUB>60</SUB> and porphyrin units on the surface, and then electrophoretically deposited on an ITO<I>/</I>SnO<SUB>2</SUB> electrode. The morphology of the photoactive layer on the electrode was significantly different from that of the layer produced as a result of separate deposition of C<SUB>60</SUB> and porphyrin. The maximum incident photon to current efficiency of the resulting electrode approached 88% at 410 nm, which is the highest value among molecule-based photovoltaic cells reported to date. This indicates that molecular assembly of the C<SUB>60</SUB> and porphyrin units on the individual nanoparticles through strong chemical attachment is a key factor in improving effective electron transfer between the photoactive units and the electrodes. </P>