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고경열,양범호,유승곤 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.3
액상에서의 오존 산화 반응에 의해 활성탄소섬유 표면 산소의 함량은 17.0wt%에서 22.4wt%로 증가하였고, 수소의 함량은 1.9wt%에서 2.7wt%로 증가하였다. 오존 산화 개시제를 달리하여 처리하면 활성탄소섬유에 생성되는 관능기들과 총산도 값을 조절할 수 있었다. 오존 처리되지 않은 활성탄소섬유의 총산도값은 0.631 meq./g인데 비하여, 1M NaOH 수용액을 개시제로 증가하였고, 특히 phenol그룹이 크게 증가하였다. NaOH로 처리하면 phenol그룹만 증가하였고, H_2O_2로 처리하면 phenol 그룹이 많이, carboxyl그룹이 약간 증가하였다. The oxygen and the hydrogen contents of activated carbon fibers increased from 17.0 wt% and 1.9 wt% to 22.4 wt% and 2.7 wt% by oxidation with ozone in liquid phase. The amount of functional groups and total acidity could be controlled with initiators of ozone decomposition reactions. The total acidity of ACF ozone treated ACF was 0.63 l meq./g, and particularly the phenolic group increased. The phenolic group only was developed when ACF was treated in NaOH solution, large amount of phenolic group and some carboxylic group only was developed when ACF was treated in NaOH solution, large amount of phenolic group and some carboxylic group were developed when ACF was treated in H_2O_2 solution.
Kyoung-Ho Park,Gi-Hoon Yang,Jin Burm Kyong 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.8
Solvolysis rate constants of 2-phenylethyl-(2-PhCH2CH2OCOCl, 1) and 2,2-diphenylethyl chloroformate (2,2- Ph2CHCH2OCOCl, 2), together with the previously studied solvolyses of α- and β-substituted chloroformate ester derivatives, are reported in pure and binary solvents at 40.0 oC. The linear free energy relationship (LFER) and sensitivities (l and m) to changes in solvent nucleophilicity (NT) and solvent ionizing power (YCl) of the solvolytic reactions are analyzed using the Grunwald-Winstein equation. The kinetic solvent isotope effects (KSIEs) in methanol and activation parameter values in various solvents are investigated for 1 and 2. These results support well the bimolecular pathway with same aspects. Furthermore, the small negative values of the entropies of activation of solvolysis of 1 and 2 in the highly ionizing aqueous fluoroalcohols are consistent with the ionization character of the rate-determining step, and the KSIE values of 1.78 and 2.10 in methanol-d indicate that one molecule of solvent acts as a nucleophile and the other acts as a general-base catalyst. It is found that the β-substituents in alkyl chloroformate are not the important factor to decide the solvolysis reaction pathway.
Yoon, Seok Ho,Burm, Jin Sik,Yang, Won Yong,Kang, Sang Yoon Korean Society of Plastic and Reconstructive Surge 2013 Archives of Plastic Surgery Vol.40 No.4
Background Intractable chronic scalp ulcers with cranial bone exposure can occur along the incision after cranioplasty, posing challenges for clinicians. They occur as a result of severe scarring, poor blood circulation of the scalp, and focal osteomyelitis. We successfully repaired these scalp ulcers using a vascularized bipedicled pericranial flap after complete debridement. Methods Six patients who underwent cranioplasty had chronic ulcers where the cranial bone, with or without the metal plate, was exposed along the incision line. After completely excising the ulcer and the adjacent scar tissue, subgaleal dissection was performed. We removed the osteomyelitic calvarial bone, the exposed metal plate, and granulation tissue. A bipedicled pericranial flap was elevated to cover the defect between the bone graft or prosthesis and the normal cranial bone. It was transposed to the defect site and fixed using an absorbable suture. Scalp flaps were bilaterally advanced after relaxation incisions on the galea, and were closed without tension. Results All the surgical wounds were completely healed with an improved aesthetic outcome, and there were no notable complications during a mean follow-up period of seven months. Conclusions A bipedicled pericranial flap is vascularized, prompting wound healing without donor site morbidity. This may be an effective modality for treating chronic scalp ulcer accompanied by the exposure of the cranial bone after cranioplasty.
Park, Kyoung-Ho,Yang, Gi-Hoon,Kyong, Jin Burm Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.8
Solvolysis rate constants of 2-phenylethyl-(2-$PhCH_2CH_2OCOCl$, 1) and 2,2-diphenylethyl chloroformate (2,2-$Ph_2CHCH_2OCOCl$, 2), together with the previously studied solvolyses of ${\alpha}$- and ${\beta}$-substituted chloroformate ester derivatives, are reported in pure and binary solvents at $40.0^{\circ}C$. The linear free energy relationship (LFER) and sensitivities (l and m) to changes in solvent nucleophilicity ($N_T$) and solvent ionizing power ($Y_{Cl}$) of the solvolytic reactions are analyzed using the Grunwald-Winstein equation. The kinetic solvent isotope effects (KSIEs) in methanol and activation parameter values in various solvents are investigated for 1 and 2. These results support well the bimolecular pathway with same aspects. Furthermore, the small negative values of the entropies of activation of solvolysis of 1 and 2 in the highly ionizing aqueous fluoroalcohols are consistent with the ionization character of the rate-determining step, and the KSIE values of 1.78 and 2.10 in methanol-d indicate that one molecule of solvent acts as a nucleophile and the other acts as a general-base catalyst. It is found that the ${\beta}$-substituents in alkyl chloroformate are not the important factor to decide the solvolysis reaction pathway.
이경호(Kyong-Ho Lee),양룡(Ryong Yang),이상범(Sang-Burm Rhee) 한국컴퓨터정보학회 2008 韓國컴퓨터情報學會論文誌 Vol.13 No.6
얼굴 특징들을 추출하는 것은 자동 독화나 휴먼컴퓨터 인터페이스, 얼굴 인식, 얼굴 이미지 테이터베이스 관리 등에서 매우 중요하다. 본 논문에서는 영상에 존재하는 다양한 색상 정보를 이용하여 얼굴 영역에서 자동 독화를 위한 특징점이 추출되도록 하였다. 얼굴의 특징들은 휘도와 채도 성분으로 인하여 다양한 색 공간에서 다양한 표현 값을 갖는다. 이를 이용하여 각 표현 값들을 증폭하거나 축소, 대비시킴으로서 얼굴 특징들을 추출되게 하였다. 눈과 코, 안쪽 입의 외곽선, 이의 외곽선을 찾았고 실험하여 좋은 결과를 얻었다. Face feature detection plays an important role in application such as automatic speechreading, human computer interface, face recognition, and face image database management. We proposed a automatic speechreading feature detection algorithm for color image using color information. Face feature pixels is represented for various value because of the luminance and chrominance in various color space. Face features are detected by amplifying, reducing the value and make a comparison between the represented image. The eye and nose position, inner boundary of lips and the outer line of the tooth is detected and show very encouraging result.
양범호,정한주,안대진,김용옥,Yang Burm-Ho,Jung Han-Ju,Ahn Dae-Jin,Kim Yong-Ok 한국연초학회 2005 한국연초학회지 Vol.27 No.2
In this work, we studied the effects of the moisture contents of cut tobacco on loose end of cigarettes. The loose end of the cigarette groups decreased with the increase of moisture contents of the cut tobacco and especially the loose end of A and C groups decreased to $31\%\;and\;52\%$ with the increase of $1\%$ moisture contents. $A-13.5\%\;and\;B-14.0\%\;and\; C-14.0\%$ moisture samples showed the increase of the weight ratio of cut tobacco over 1.4mm cut length but the decrease under 1.4mm cut length. We concluded that the main reasons were regarded to reduction of small fragment tobaccos caused by increase of moisture contents and exception of air-suction transport of tobaccos to cigarette making machine. In spite of the moisture increase of cut tobaccos under fixed EPD(encapsulated pressure drop), the hardness of Band C sample groups were maintained constantly except A group. This result means that under fixed EPD, the weight of cut tobacco in cigarette rods increases to compensate the reduction of pressure drop by moisture increase of cut tobaccos.
위성과 지상 회선에서 파일 전송 프로토콜의 최적 메세지 길이에 대한 연구
박진양(Park Jin Yang),이용훈(Lee Yong Hun),김정호(Kim Jeong Ho),이상범(Rhee Sang Burm) 한국정보처리학회 1997 정보처리학회논문지 Vol.4 No.1
The advantages of service in satellite links are representatively a long distance and large capacity transfer and simultaneous communication. And terrestrial links are methods of high speed and high quality data transfer. Therefore a combined form of characteristics of satellite and terrestrial links is desirable to furnish a good quality service to subscribers. And in satellite links an analysis method and a simulation method of file transfer are conducted to evaluate the efficiency of file transfer. The parameters are used the message length and transmission time, and the number of chain record and transmission time. From the results of evaluation, in satellite links, it is found that when the message length is shorter than 512 bytes, the file transmission time becomes extremely long and when the message length is set at 1024 bytes, the file transmission time abruptly increase from 2048 bytes. Also it is confirmed that when the number of chain record is under 15, the file transmission time becomes extremely long and if the number increase up to 90, the time becomes gradually short and over 90, it becomes constant. Therefore, from the result of file transmission in the case of utilizing satellite links, it is confirmed that the optimum message length in the minimum transmission time is present closely at 1024 bytes. Also it is confirmed that when the satellite transmission speed becomes smaller from 24 kbps to 2400 bps, the optimum message length also becomes smaller form 640 bytes to 256 bytes.