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Catalytic Oxidation of Trichloroethylene over Pd-Loaded Sulfated Zirconia
Park, Jung-Nam,Lee, Chul-Wee,Chang, Jong-San,Park, Sang-Eon,Shin, Chae-Ho Korean Chemical Society 2004 Bulletin of the Korean Chemical Society Vol.25 No.9
The oxidative decomposition of trichloroethylene (TCE) was investigated using palladium catalysts supported on pure and sulfated zirconia. The reactions were performed under dry and wet conditions in the temperature between 200 and $550^{\circ}C$ keeping GHSV of 14,000 $h^{-1}.$ The products such as $C_2Cl_4,\;C_2HCl_5,\;CO\;and\;CO_2$ were observed in the reaction. The addition of water in the feed affected the distribution of reaction product with dramatically improved catalytic activity. The spectroscopic investigations gave an evidence that the strong acid sites play an important role on controlling the catalytic activity. Among the catalysts investigated, the Pd-loaded sulfated zirconia catalyst with 1 wt% Pd was found to exhibit the highest catalytic activity in the presence of water vapor having the stability for 30 h of the reaction at $500^{\circ}C$. The successful performance of the catalyst might be attributed to promotional effect of Pd active sites and strong acid sites induced from surface sulfate species on zirconia.
Recognition of Emotional states in Speech using Hidden Markov Model
Sung-ill Kim,Sang-hoon Lee,Wee-jae Shin,Nam-chun Park 한국지능시스템학회 2004 한국지능시스템학회 학술발표 논문집 Vol.14 No.2
본 논문은 분노, 행복, 평정, 슬픔, 놀람 등과 같은 인간의 감정상태를 인식하는 새로운 접근에 대해 설명한다. 이러한 시도는 이산길이를 포함하는 연속 은닉 마르코프 모델(HMM)을 사용함으로써 이루어진다. 이를 위해, 우선 입력음성신호로부터 감정의 특징 파라메타를 정의한다. 본 연구에서는 피치 신호, 에너지, 그러고 각각의 미분계수 등의 운율 파라메타를 사용하고, HMM으로 훈련과정을 거친다. 또한, 화자적응을 위해서 최대 사후확률(MAP) 추정에 기초한 감정 모델이 이용된다. 실험 결과, 음성에서의 감정 인식률은 적응 샘플수의 증가에 따라 점차적으로 증가함을 보여준다.
A Next-Generation Friction Burn Caused by a Cordless Vacuum Cleaner
Wee Sung Jae,Park Myong Chul 대한창상학회 2020 Journal of Wound Management and Research Vol.16 No.3
Consumers today are increasingly using a new type of vacuum cleaner with a soft roller head. Among injuries from the use of household appliances, vacuum cleaner-related friction burns tend to be underestimated in their severity, compared to treadmill-related friction burns, which have been explored more extensively in literature. We present the case of a 17-month-old child with a whitish eschar on the volar side of her right fourth toe, which had been sucked into the rotating soft roller head of one of the new cordless vacuum cleaners. Initially, the wound resembled a simple abrasion, but it was whitish enough for us to suspect a full-thickness burn. We performed gauze rubbing for granulation with a biologic dressing material and basic fibroblast growth factor. The burn took more than 3 weeks to heal completely. It is essential to reappraise the severity of friction burns caused by the more recent vacuum cleaner models with powered rollers and to establish appropriate treatment protocols.
Park, Hea Jung,Kim, Ji Na,Yoo, Hyun-Ji,Wee, Kyung-Ryang,Kang, Sang Ook,Cho, Dae Won,Yoon, Ung Chan American Chemical Society 2013 Journal of organic chemistry Vol.78 No.16
<P>On the basis of the results of frontier orbital considerations, 4-substituted-2′-pyridyltriazoles were designed to serve as ancillary ligands in 2-phenylpyridine main ligand containing heteroleptic iridium(III) complexes that display deep blue phosphorescence emission. The iridium(III) complexes, <B>Ir1</B>–<B>Ir7</B>, prepared using the new ancillary ligands, were found to display structured, highly quantum efficient (Φ<SUB>p</SUB> = 0.20–0.42) phosphorescence with emission maxima in the blue to deep blue 448–456 nm at room temperature. In accord with predictions based on frontier orbital considerations, the complexes were observed to have emission properties that are dependent on the electronic nature of substituents at the C-4 position of the pyridine moiety of the ancillary ligand. Importantly, placement of an electron-donating methyl group at C-4′ of the pyridine ring of the 5-(pyridine-2′-yl)-3-trifluoromethyl-1,2,4-triazole ancillary ligand leads to an iridium(III) complex that displays a deep blue phosphorescence emission maximum at 448 nm in both the liquid and film states at room temperature. Finally, an OLED device, constructed using an Ir-complex containing the optimized ancillary ligand as the dopant, was found to emit deep blue color with a CIE of 0.15, 0.18, which is close to the perfect goal of 0.15, 0.15.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/joceah/2013/joceah.2013.78.issue-16/jo4012514/production/images/medium/jo-2013-012514_0013.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jo4012514'>ACS Electronic Supporting Info</A></P>
Wee, M.S.,Park, C.K.,Cho, S.R.,Lee, S.S.,Yeon, S.H.,Kim, C.D.,Cho, C.Y.,Choi, S.H.,Sang, B.D.,Son, D.S.,Li, Z.D.,Jin, H.J. Asian Australasian Association of Animal Productio 2008 Animal Bioscience Vol.21 No.10
This study was performed to clarify whether the variation of stress related heat shock protein 70 (HSP70) (GenBank X68213) gene was associated with the nuclear morphological change of in vitro maturation and in vitro capacitation in oocytes of pig ovaries obtained at the slaughterhouse. The nucleic acid substitution of C to G at the 483rd position was found out in HSP70 K1 (290-512) from X68213. The ovaries were categorized into CC, CG, and GG genotypes using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) (BsiHKA I). After the second in vitro maturation of immature fresh oocytes, the relation of nuclear morphological change in oocytes with the genotype of HSP70 K1 gene was such that the MII ratios of the genotype GG and CG (46.93% and 42.20%, respectively) were significantly higher than that of the CC genotype (10.71%) (p<0.05). With respect to in vitro maturation of frozen-thawed oocytes by an open pulled straw (OPS) method, the percentage of oocytes matured to MII stage of the CG genotype showed a higher trend than CC and GG genotypes. After the in vitro maturation of immature fresh oocytes and frozen-thawed oocytes by the OPS method, the relation of the pronuclei change in oocytes matured in vitro with HSP70 genotype was assessed, and the result showed that the enlarged sperm heads (ESH) of matured fresh oocytes and frozen-thawed oocytes were 80.0% and 60.0% in the CC genotype, respectively. The CC genotype group had a significantly higher rate of ESH than the CG and the GG genotype group (p<0.05). The ratios of polyspermic invasion were not different among HSP70 of the three genotypes. It was considered that the rate of in vitro maturation of fertilized oocytes was expected to differ according to genotype of the stress related gene.
Wee, Sung-Hun,Moon, Seung-Hyun,Park, Chan,Yoo, Sang-Im The Korean Society of Superconductivity and Cryoge 2004 한국초전도저온공학회논문지 Vol.6 No.4
We report a successful fabrication of high-$J_C$ $NdBa_2Cu_3O_{7-{\delta}}$ (NdBCO) films on (100) $SrTiO_3$ substrates by pulsed laser deposition (PLD) in high oxygen pressures ranging from 400 to 800 mTorr. Fabricated NdBCO films exhibited only c-axis orientation, good out-of-plane and in-plane textures, and also excellent superconducting properties, including critical temperature ($T_C$) and critical current density ($J_C$) of above 90 K and the highest of $3.1MA/cm^2$ at 77 K in self-field, implying that NdBCO is a perspective alternative to YBCO for coated conductor. In low oxygen pressures ranging from 100 to 200 mTorr, however, the films showed a-, c-mixed orientation and degraded $T_{C,zero}$ values due to the formation of $Nd_{1+x}Ba_{2-x}Cu_3O_{7-{\delta}}$-type solid solutions with an excessive substitution of $Nd^{3+}$ ions for the $Ba^{2+}$ sites.