푸른길 공원의 대기 환경 특성에 관한 연구

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.

공급사슬에서 수량할인과 수익공유를 반영한 계약

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.

Proteomic Characterization of Outer Membrane Vesicles (OMVs) Derived from Antimicrobial Resistant and Susceptible Escherichia coli

Se Pyeong Im,Jong Earn Yu,Jung Seok Lee,Si Won Kim,Jassy Mary Lazarte,Ho Bin Jang,Seong Bin Park,Tae Sung Jung 대한수의학회 2014 대한수의학회 학술대회발표집 Vol.2014 No.-

Theoretical study of new heteroleptic ruthenium complex with conjugated phenoxazines.

Park, Se Won,Kim, Joo Young,Kim, Young Sik American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.8

<P>In this study, novel ruthenium complexes substituted with donor antenna group were designed and studied theoretically to enhance the photovoltaic. We have compared the well known N3 dye and Ru(II) complexes substituted with antenna groups, such as a conjugated phenoxazine (POZ) of one site, two conjugated POZs of both site to bipyridine. Molecular orbital analysis confirmed that the HOMOs of N3 are localized over the NCS ligand orbitals of N3, however, the HOMO, HOMO-1 and HOMO-2 of Ru(dcbpy)(pbpy)(NCS)2 and Ru(dcbpy)(dpbpy)(NCS)2 are localized over the NCS or POZ antenna ligand. The TDDFT calculations showed that the complexes with POZ donor antenna had panchromatic absorption spectra in the region above 400 nm compared to N3 dye. Absorption bands between 400 and 500 nm were ascribed to transitions of antenna unit. From these results, it is shown that substituted antenna moiety enhanced their electronic and optical properties as dye sensitizer, and it is expected that these ruthenium complexes with POZ antenna would show better performance than N3 dye in conversion efficiency for DSSCs.</P>

Phosphate removal in constructed wetland with rapid cooled basic oxygen furnace slag

Park, Jong-Hwan,Wang, Jim J.,Kim, Seong-Heon,Cho, Ju-Sik,Kang, Se-Won,Delaune, Ronald D.,Seo, Dong-Cheol Elsevier 2017 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.327 No.-

<P><B>Abstract</B></P> <P>The objective of this study was to evaluate adsorption characteristics of phosphate by rapid cooled basic oxygen furnace slag (RC-BOFS) through various conditions and removal rate of phosphate in small-scale constructed wetland with RC-BOFS as filter material. The phosphate adsorption by RC-BOFS was rapid in the first 0.5h and the pseudo-second-order kinetic model fit the data better than the pseudo-first-order kinetic model. The maximum phosphate adsorption capacities of RC-BOFS under different pH were in the following order: 3.57mgPg<SUP>−1</SUP> (pH 5)>2.47mgPg<SUP>−1</SUP> (pH 7)>1.46mgPg<SUP>−1</SUP> (pH 9). Small-size RC-BOFS (0.8–2.3mm) was more efficient with 23% higher phosphate adsorption than big-size RC-BOFS (2.3–4.6mm). Characterization of RC-BOFS before and after phosphate adsorption by XRD, FTIR and SEM-EDS indicated that phosphate adsorption by RC-BOFS was dominated by metal oxide and precipitation by calcium and was closely related to the slag chemical properties. The phosphate saturation time in constructed wetland with coarse sand was predicted about 292days, whereas the longevity of constructed wetland with adding about 25% RC-BOFS to the coarse sand can significantly increase up to 1349days. It was concluded that the horizontal flow constructed wetland with sand 75%:RC-BOFS 25% ratio could achieve high phosphate removal rate and near-neutral pH for meeting the acceptable water quality discharge standard from water treatment plant.</P> <P><B>Highlights</B></P> <P> <UL> <LI> RC-BOFS was an effective adsorbent for phosphate. </LI> <LI> Contact time, initial concentration and pH value affect the adsorption capacity. </LI> <LI> Adsorption mechanisms were well described by SEM-EDS, XRD and FTIR. </LI> <LI> High phosphate adsorption capacity and near-neutral pH was observed in CW with sand and RC-BOFS. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

New application of three‐dimensional printing biomaterial in nasal reconstruction

Park, Sun Hwa,Yun, Byeong Gon,Won, Joo Yun,Yun, Won Soo,Shim, Jin Hyung,Lim, Mi Hyun,Kim, Do Hyun,Baek, Sang A.,Alahmari, Yahya Dhafer,Jeun, Jun Ho,Hwang, Se Hwan,Kim, Sung Won Wiley (John WileySons) 2017 The Laryngoscope Vol.127 No.5

Host immune response index in gastric cancer identified by comprehensive analyses of tumor immunity

Park, Charny,Cho, Junhun,Lee, Jeeyun,Kang, So Young,An, Ji Yeong,Choi, Min Gew,Lee, Jun Ho,Sohn, Tae Sung,Bae, Jae Moon,Kim, Sung,Kim, Seung Tae,Park, Se Hoon,Park, Joon Oh,Kang, Won Ki,Sohn, Insuk,Ju Informa UK (Taylor Francis) 2017 Oncoimmunology Vol.6 No.11

<P>Tumor infiltrating lymphocytes (TIL) in Epstein-Barr virus (EBV)-associated/microsatellite-unstable (MSI) gastric carcinomas (GC) constitute immune-active principal cellular components of tumor microenvironment and contribute to better prognosis. With the remarkable success of cancer immunotherapies, there is an urgent need for a comprehensive understanding of tumor-immune interactions in patients with GC in the context of host immune response. To identify GC subtype-specific immune response gene set, we tested differentially expressed genes for MSI and EBV+ GC subtypes in randomly selected test set (n = 278) in merged ACRG-SMC microarray and TCGA RNA sequencing data set. We identified Host ImmunE Response index (HIERI) consisting of 29 immune genes classifying GC patients into robust 3 groups with prognostic significance. Immune-high cluster 1 was enriched with PD-L1(High)/EBV+/MSI/TILHigh with the best clinical outcome while immune-low cluster 3 displayed worst outcome and exemplified with PD-L1(Low)/EBV-/MSS. The results were validated in the same cohort (n = 279) and independent cohort (n = 181) with RNA from formalin-fixed paraffin-embedded (FFPE) tissue. Unexpectedly, nearly half of GC in cluster 1 were EBV-/MSS and 10% of cluster 3 GC were EBV+/MSI GC patients, suggesting that in addition to EBV+/MSI GC subtypes, EBV-/MSS subtype also constitutes almost half of high immune cluster and would be a good candidate for immune checkpoint inhibitor therapy. In contrary, almost 10% of EBV+/MSI GC patients may not respond to immune checkpoint inhibitor therapy. Thus, our HIERI gene signature demonstrates the potential to subclassify tumor immunity levels, predict prognosis and help immunotherapeutic decisions.</P>

Recycling of rice straw through pyrolysis and its adsorption behaviors for Cu and Zn ions in aqueous solution

Park, Jong-Hwan,Wang, Jim J.,Kim, Seong-Heon,Cho, Ju-Sik,Kang, Se-Won,Delaune, Ronald D.,Han, Kun-Jun,Seo, Dong-Cheol Elsevier 2017 Colloids and surfaces. A, Physicochemical and engi Vol.533 No.-

<P><B>Abstract</B></P> <P>Biochar has been suggested as new adsorbent for removing heavy metals from aqueous solutions. However, adsorption nature of biochar is influenced by feedstock-specific properties. In this study, experiments were performed to characterize the effect of cation exchange on adsorption behavior of Cu and Zn in single- and binary-metal systems by rice straw biochar (RSB) made by pyrolysis at 600°C. Result of kinetic experiment showed that the Cu and Zn in aqueous solution were rapidly adsorbed from the RSB in the first 2h and then reached the equilibrium after 4h. The fitting of intraparticale diffusion model showed fast Cu diffusion into boundary layer and pores of biochar than Zn. In parallel with 2.65meqL<SUP>−1</SUP> Cu and 1.79meqL<SUP>−1</SUP> Zn being adsorbed by RSB, up to 1.65 and 0.76meqL<SUP>−1</SUP> exchangeable cations were released into the solution, indicating that cation exchange could contribute 62.3 and 42.5% to Cu and Zn sorption by RSB. Langmuir maximum adsorption capacities (<I>a</I>) of RSB for Cu and Zn were 56.5 and 38.6mgg<SUP>−1</SUP> in single-metal system and 40.2 and 7.9mgg<SUP>−1</SUP> in binary-metal system, respectively. Overall, the results demonstrate that the Cu and Zn adsorption by RSB was closely related to the exchangeable cation. The application of RSB could be especially attractive when considering biochar with high cation exchange capacities.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>