http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
민경우,이경석,박옥현,윤관주,김도술,박세일,정원삼,이대행,조영관,Min, Kyoung-Woo,Lee, Kyoung-Soek,Park, Ok-Hyun,Yoon, Kwan-Ju,Kim, Do-Sool,Park, Se-Il,Jeung, Won-Sam,Lee, Dae-Hang,Cho, Young-Gwan 한국환경보건학회 2015 한국환경보건학회지 Vol.41 No.3
Objectives: This study aimed to survey the characteristics of air quality and meteorological conditions in a greenway park. Methods: We measured meteorological and health related factors, including noise, particulate matter ($PM_{10}$) and selected gaseous air pollutants at three locations in a greenway park and on a general roadside as comparison. The measurements were repeated four times from April to October 2014. Results: The average air temperature in the greenway park was $20.7^{\circ}C$ which was $1-2^{\circ}C$ lower than on the general roadside. The average $PM_{10}$ concentration in the greenway park was $85.0{\mu}g/m^3$, a level 2-3 times lower than that at the roadside. The noise level at the greenway site was 4.4 dB(A)- 23.0 dB(A) lower than at the roadside. The average CO, $CO_2$, $SO_2$ and NOx concentrations in the greenway park were lower than at the roadside. The average phytoncide and anions concentrations in the greenway park were higher than at the roadside. Conclusions: The urban forest of the greenway park may have some impact on air quality and meteorological conditions.
Electrical, Thermal, and Thermoelectric Transport Properties of Se-doped Polycrystalline Re2Te5
Se Woong Lee,Okmin Park,Hyun-Sik Kim,Won-Seon Seo,Sang-il Kim 대한금속·재료학회 2022 대한금속·재료학회지 Vol.60 No.12
Re2Te5 is considered a potential thermoelectric material because of its intrinsically low thermalconductivity, due to its complex crystal structure. Herein, a series of Se-doped Re2Te5 (Re2Te5-xSex, x = 0, 0.2,1, and 2) samples were synthesized, and their electrical and thermal transport properties were investigated. Pure orthorhombic Re2Te5 phases were successfully synthesized without any impurities for all compositions,and the continuous decrease in the calculated lattice parameters confirmed the substitution of Se atoms atthe Te sites. A maximum power factor of 0.135 mW/mK2was achieved for the sample with x = 0.2 at 880 K,mainly due to the increase in carrier concentration and electrical conductivity. The lattice thermalconductivity significantly decreased for all doped samples, which was attributed to the point defect phononscattering caused by Se doping. The thermoelectric figure of merit, zT reached a maximum value of 0.20 at880 K for Re2Te4.8Se0.2 (x = 0.2) sample, which was approximately 22% higher than that of the pristine Re2Te5sample. The weighted mobility, quality factor, and expected zT were calculated to evaluate the optimizationof the power factor and zT.
박세호(Se Ho Park),이영해(Young Hae Lee),조동원(Dong Won Cho) 한국SCM학회 2012 한국SCM학회지 Vol.12 No.2
One of the most important reasons in pursuit of supply chain management is to prevent sub-optimization caused by decentralized decision making over the various entities. As supply chain coordination approach to overcome such a setting, contract mechanisms have frequently been used. However, a coordinated supply chain might fail to provide additional profit to one of the players. In result, it is necessary that a contract mechanism is designed to achieve the same profit in a centralized situation (coordination) and to improve the benefit of all the supply chain players (winwin). In this paper, we address supply chain contract based on revenue sharing and quantity discount considering price and service level. We show that the trade parameters among different entities in the supply chain contract can be chosen to achieve coordination and a win-win outcome.
Thermoelectric Properties of Cu-added Polycrystalline Bi2O2Se Oxyselenide
Si-young Bae,Se Woong Lee,Hyun-Sik Kim,Okmin Park,Hyunjin Park,Won-Seon Seo,Sang-il Kim 대한금속·재료학회 2022 대한금속·재료학회지 Vol.60 No.12
Bi2O2Se oxyselenide has been actively studied as a potential n-type thermoelectric material becauseof its intrinsically low thermal conductivity and high Seebeck coefficient (S). However, Bi2O2Se has very lowelectrical conductivity (σ), resulting in relatively poor thermoelectric performance. Herein, we investigate theeffect of Cu addition on the electrical and thermal transport of n-type polycrystalline Bi2O2Se. A series ofCuxBi2O2Se (x = 0, 0.0025, 0.005, and 0.0075) polycrystalline samples were synthesized by a conventional solid state reaction. Tetragonal Bi2O2Se was successfully synthesized, and its lattice parameters graduallydecreased with the addition of Cu. Further, σ decreased and the magnitude of S increased with increasingCu content, according to the trade-off relationship between these parameters. Consequently, a maximumpower factor of 0.106 mW m-1 K-2 was achieved for the sample with x = 0.0025 at 300 K, owing to the increasein the magnitude of S. The Hall carrier concentration decreased exponentially with the addition of Cu, whichis mainly attributed to the possible enlargement of the band gap of the Cu-added samples. The lattice thermalconductivity decreased with increasing x, which was attributed to point-defect phonon scattering via Cuaddition. Therefore, a maximum zT of 0.222 was obtained at 790 K for the Cu0.0025Bi2O2Se (x = 0.0025) sample,which was approximately 8% higher than that of the pristine Bi2O2Se sample.
Park Yae Won,Park Ki Sung,Park Ji Eun,Ahn Sung Soo,Park Inho,Kim Ho Sung,Chang Jong Hee,Lee Seung-Koo,Kim Se Hoon 대한영상의학회 2023 Korean Journal of Radiology Vol.24 No.2
Objective: Cyclin-dependent kinase inhibitor (CDKN)2A/B homozygous deletion is a key molecular marker of isocitrate dehydrogenase (IDH)-mutant astrocytomas in the 2021 World Health Organization. We aimed to investigate whether qualitative and quantitative MRI parameters can predict CDKN2A/B homozygous deletion status in IDH-mutant astrocytomas. Materials and Methods: Preoperative MRI data of 88 patients (mean age ± standard deviation, 42.0 ± 11.9 years; 40 females and 48 males) with IDH-mutant astrocytomas (76 without and 12 with CDKN2A/B homozygous deletion) from two institutions were included. A qualitative imaging assessment was performed. Mean apparent diffusion coefficient (ADC), 5th percentile of ADC, mean normalized cerebral blood volume (nCBV), and 95th percentile of nCBV were assessed via automatic tumor segmentation. Logistic regression was performed to determine the factors associated with CDKN2A/B homozygous deletion in all 88 patients and a subgroup of 47 patients with histological grades 3 and 4. The discrimination performance of the logistic regression models was evaluated using the area under the receiver operating characteristic curve (AUC). Results: In multivariable analysis of all patients, infiltrative pattern (odds ratio [OR] = 4.25, p = 0.034), maximal diameter (OR = 1.07, p = 0.013), and 95th percentile of nCBV (OR = 1.34, p = 0.049) were independent predictors of CDKN2A/B homozygous deletion. The AUC, accuracy, sensitivity, and specificity of the corresponding model were 0.83 (95% confidence interval [CI], 0.72–0.91), 90.4%, 83.3%, and 75.0%, respectively. On multivariable analysis of the subgroup with histological grades 3 and 4, infiltrative pattern (OR = 10.39, p = 0.012) and 95th percentile of nCBV (OR = 1.24, p = 0.047) were independent predictors of CDKN2A/B homozygous deletion, with an AUC accuracy, sensitivity, and specificity of the corresponding model of 0.76 (95% CI, 0.60–0.88), 87.8%, 80.0%, and 58.1%, respectively. Conclusion: The presence of an infiltrative pattern, larger maximal diameter, and higher 95th percentile of the nCBV may be useful MRI biomarkers for CDKN2A/B homozygous deletion in IDH-mutant astrocytomas.
Se-Won Park,Hyuk-Sung Kwon,Chang-Ha Lee,Ik-Sung Ahn 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.92 No.-
Glutamate was identified as a compatible solute for Sulfurovum lithotrophicum 42BKTT, which is a marinechemolithoautotrophic bacterium and performs CO2 fixation through the reductive tricarboxylic acid(TCA) cycle. In a medium of 20 g/L or higher concentration of NaCl, sufficient to induce osmotic stress, theintracellular level of glutamate rapidly increased on exposure to high levels of NaHCO3. Correlation of theglutamate accumulation with the level of NaHCO3 was determined and compared to that with the level ofNaCl. Glutamate synthesis driven by NaHCO3 was measured at 1.29 mg Glu/mg protein/(Osmol/L), and18.4 times higher than that driven by NaCl (0.07 mg Glu/mg protein/(Osmol/L)). Thus, the synthesis ofglutamate from 2-oxoglutarate, which is thefirst product of CO2 assimilation in the reductive TCA cycle,was triggered at the exposure to the high level of NaHCO3 and appeared to support S. lithotrophicum42BKTT via resistance to osmotic stress and CO2 toxicity.
Park, Se-Jin,Kim, Seongchan,Kim, Sung-Yon,Jeon, Noo Li,Song, Joon Myong,Won, Cheolhee,Min, Dal-Hee American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.40
<P>An improved cell conversion strategy for neural differentiation of mouse embryonic stem (mES) cells is developed by incorporating functionalized mesoporous silica nanoparticle (MSN) as an efficient delivery carrier of retinoic acid (RA), which is a pleiotropic factor required for initiation of neural differentiation. Traditional RA-mediated neural differentiation methods required either preactivation of the cells to the differentiating state by embryoid body (EB) formation or repetitive treatment of the differentiation factor. Our modified cell conversion system involves only singular treatment of the RA/MSN complex, which simplified the whole process and accelerated neural induction to be finished within 6 days with high quality. With our new method, neural cells were successfully derived from mES cells with stable expression of neurite marker gene.</P>