Polyacrylonitrile膜 氣體透過性

朴秀敏 新羅大學校 1985 論文集 Vol.20 No.-

Permeabilitles of herium, neon and argon gas into polyacrylonitrile membrane have been discussed in the wide range of temperature from 70 to 140℃ by means of timelag method. The Arrhenius plots of log P and log D vs. 1/T for herium, neon and argon gases gave a sharp changed-point at 96℃ and this point was considered to be the Glass Transition temperature Tg This results have given good incidence to the WLF equation in the region higher than Tg. Diffusion activation enerey of argon was 105 Kcal-mol-1 at 96℃. S lubility of herium, neon and argon gases was interpreted by segment motion and free volume phenomena.

Polyacrylonitrile中의 Model Disperse Dye의 擴散

최해구,朴秀敏 新羅大學校 1985 論文集 Vol.18 No.-

Diffusion coefficient of model disperse dye, p-Nitroaniline (p-NA) in polyacrylonitrile (PAN) have been measured in the wide range from 75°to 125℃ by means of sublimation diffusion of vacuum heating system. The plot of Log D vs. 1/T gave a sharp changed-point at 85℃ and this point was considered to be the glass transition temperature, Tg. In the region higer than Tg, these results have given good incidence to the equation, WLF with standard temperature as Tg.

In situ 고상 에피택시 방법에 의한 CoSi₂/Si(111)구조의 형성

이정주,강민성,김현수,최치규,이운환,이종덕,이영백,김건호,이정용 濟州大學校 基礎科學硏究所 1996 基礎科學硏究 Vol.9 No.2

초고진공에서 공상에피택시(solid-phase epiyaxy, SPE) 방법으로 CoSi₂를 Si(111)기판 위에 에피택시 성장시켰다. 2MeV⁴He++ ion후방산란 분광기와 사중결정 x-선 회절기 및 고분해 투과전자 현미경을 이용하여 성장된 CoSi₂의 상과 조성, 결정성, 그리고 계면의 미시구조를 조사하였다. 초고진공상태의 실온에서 Si(111)-7X7기판에 Co를 약 20 ~50 ?? 중착한 후 SPE에 의하여 실리사이드를 형성시키는 경우 600℃에서는 B-형의 CoSi₂가, 그리고 700℃에서는 A형의 CoSi₂가 선택적으로 에피택시 성장하였으며, 정합성은 B-CoSi₂[110]//Si[110] and CoSi₂(111)//Si(111)이, 그리고 700℃에서는 A-CoSi₂[110]//Si[110], CoSi₂(002)//Si(002)을 나타내었다. Epitaxial films of CoSi₂were grown on Si(111) substrates by in situ solid-phase epitaxy in a ultrahigh vacuum. The phase, the chemical composition, the crystallinity, and the microstructure of the Silicide/Si interface were investigated by 2-MeV⁴He++ ion-backscattering spectrometry, quadruple crystal X-ray diffractometry, and high-resolution transmission eletron micorscopy. High-quality films of either B-type or A-type CoSi₂ could be grown selectively on Si(111) substrates by depositing ~ 20 ~ 50 ?? of Co on a Si(111)-7X7 substrate followed by in situ annealing at 600℃ or 700℃ for 10 min. The matching face relationships are CoSi₂[110]//Si[110] and CoSi₂(111)//Si(111) by B-type CoSi₂ and CoSi₂[110]//Si[110]//Si[110] and CoSi₂(002)//Si(002) for A-type CoSi₂.

INTERACTION BETWEEN WATER-SOLUBLE POLYMERS AND SMALL MOLECULES : BINDING MECHANISM OF C.I. BASIC RED 18 TO CARBOXYMETHYL CELLULOSE Carboxymethyl Cellulose에 대한 C.I. Basic Red 18의 結合機構

Pak,Soo-min,Kim,Kyung-hwan 新羅大學校 1985 論文集 Vol.19 No.-

Carboxymethyl Cellulose (CMC)와 Cation dye, C.I. Basic (Red 18)의 相互作用이 透析速度法과 分光學的 方法에 의하여 검토되어졌다. 透析速度法과 溫度變化의 實驗으로부터 얻은 結合等溫線은 協同性相互作用이 특징적인 Sigmoid 형을 나타내었고 協同性을 고려한 McGhee와 von Hippel의 理論式에 의하여 解析되었다. 結合 및 協同 parameter, K ω의 溫度變化 依存性으로부터 구한 結合의 熱力學的 量은 ΔH<0, ΔS>0 이었다. 可視영역에서의 誘起 CD Spectrum의 측정으로부터 誘起 Cotton effect가 관찰되었고, CMC-Red 18의 結合狀態가 검토되었다. The interaction of cation dye, C.I. Basic Red 18(Red 18)with carboxymethyl cellulose (CMC) in homogeneous aquecus solution has been studied by means of dynamic dialysis and optical methods. The binding isotherms for CMC-Red 18 showed a sigmoidel increase, indicating the cooperativity in the binding. The Scatchard plots of the binding isotherm gave a convex upward curve. By applying McGhee and von Hippel`s theory to the isotherm, the binding parameters, K, n and ω, change in enthalphy and in entropy of CMC-Red 18 complex, multiple induced Cotton effects in the visible spectral region of Red 18 were observed and binding situation was studied.

Permeability of C. I. Basic Red 18 through Charged Cellulosic Membranes

Pak, Soo-min 新羅大學校 1986 論文集 Vol.21 No.-

Ion 選擇透過性 Cellulose膜의 分子設計에 관한 基礎的 知見을 얻을 目的으로 化學改質Cellulose負荷電, Carboxymethyl Cellulose membrane의 Cation性 染料 C.I. Basic Red 18의 透過實驗을 行하였다. C.I. Basic Red 18의 膜透過係數의 濃度依存性은 Alkali metal chloride와 tetraalkylammonium chloride의 Simple Salts의 透過거동과는 다르고 結果는 Dual mode型을 나타내었다. The permeation of C.I. Basic Red 18 through cellulosic charged membranes was investigated. The membranes used were partially carboxymethylated cellulose with various degrees of substitution. The permeability coefficients were found to decrease with increase in dye concentration. The dependence of the permeability on the dye concentration was interpreted by dual mode theory.

Cooperative Interaction of Carboxymethyl Cellulose With C. I. Basic Red 18 in Aqueous Solution : Ionic strength dependence

Pak, Soo-min 新羅大學校 1984 論文集 Vol.17 No.-

染色모델계로써 水溶性高分子와 染料의 相互作用에 관하여의 硏究는 많이 행하여져 오고 있다. 본 연구는 Carboxymethyl Cellulose (CMC)와 카치온 染料 C. I. Basic Red 18 (Red 18) 의 結合機構를 解明할 目的으로 CMC와 Red 18의 結合平衡系를 透析速度法에 依하여 조사하였다. 그 결과 等溫結合綿을 求하며 Scatcahrd plot를 행하고 McGhee and Von Hippel의 理論式에 의하여 結合平衡系를 해석하였다. 결과는 다음과 같다. 1. 본 실험의 이온강도의 범위에서의 CMC-Red 18의 결합등온선은 Sigmoid형이었다. 2. 이온강도의 증가에 따라 고유결합 정수 K 및 협동성 Parameter, ω는 감소하고 염료한 分子가 점유한 잔기수 n는 증가하였다. 3. 이온강도의 증가에 따라 염료의 CMC의 기질체간의 경쟁적 결합이 관찰되었고 CMC-Red 18의 주된 결합력은 정전기 結合에 의한 것으로 추정되었다. In the continuation of a preceding study this paper deals with ionic strength depen- dence of the binding parameters of C. I. Basic Red 18 (Red 18) to carboxymethyl cellulose(CMC), the competitive binding of the dye with the substrate analogues of carboxymethyl cellulose and the change in dynamic dialysis of Red 18 by the binding with carboxymethyl cellulose. The binding isotherms of Red 18 have been determined in an acetate buffer at pH 4.2 and 25。C by dynamic dialysis method. The isotherms showed a sig-moidal increase of binding with increasing free dye concentration in solution. The increase in ionic strength from 0.02 to 0.20 reduces the value of the binding constant, K. Competitive binding was found between the substrate analogues of carboxymethyl cellulose and the dye, Red 18, This results strongly suggests that the main force of attraction between charged carboxyl groups and dye cations is electrostatic in nature.

안드로이드 어플리케이션 역공학 방지 기술 분석

박민건 ( Min-gun Pak ),오정희 ( Jeonghui Oh ),류환일 ( Hwahn-il Lyoo ),김수민 ( Soo Min Kim ) 한국정보처리학회 2014 한국정보처리학회 학술대회논문집 Vol.21 No.1

역공학 방지 기법이 적용되지 않은 어플리케이션은 악의적인 역공학에 취약할 수밖에 없다. 악의적인 역공학은 사회적으로 여러가지 손실을 가져온다. 그러므로 역공학 방지 기법을 적용하여 어플리케이션을 보호해야 한다. 역공학 방지 기법은 다양하며, 크게 자바 소스 난독화, Smali 코드 조작, Dex 파일 포맷 조작, 그리고 Zip 파일 포맷 조작 기법으로 나눌 수 있다. 자바 소스 난독화는 코드의 가독성을 떨어트려 안드로이드 어플리케이션의 역공학을 어렵게 하는 기법이다. Smali 코드 조작 기법은 Goto 문 추가, 예외 처리 재귀 기법 등을 통하여 역공학을 막는 기법이다. Dex 파일 포맷 조작 기법에는 클래스명 길이 변경, 헤더 크기 변경 등을 통해 역공학을 어렵게 만드는 기법이다. Zip 파일 포맷 조작 기법은 Zip 파일 포맷에서 헤더값을 조작하여 마치 암호화된 것처럼 보이도록 만드는 기법이다. 본 논문에서는 이러한 다양한 기법들에 대해서 설명하고 이를 비교·분석한다.

Status Report of GMTNIRS Development

In-Soo Yuk,Sungho Lee,Moo-Young Chun,Kang-Min Kim,Chan Park,Soojong Pak,Heeyoung Oh,Sang on Lee,Han shin Lee,Daniel T. Jaffe,Tae-Soo Pyo,Byeong-Gon Park,Young-Soo Kim,Jaemann Kyeong 한국천문학회 2010 天文學會報 Vol.35 No.1

어택틱 폴리프로필렌의 화학적 개질 ― 어택틱 폴리프로필렌의 포스포닐화

박종민(Chong Min Pak),이수민(Soo Min Lee),진정일(Jung Il Jin) 한국고분자학회 1979 폴리머 Vol.3 No.3

Incidental thyroid cancer detected by 18F-FDG PET: does it have different clinicopathological features?

Pak, Kyoungjune,Cheon, Gi Jeong,Lee, Kyu Eun,Park, Young Joo,Choi, Hoon Sung,Min, Hye Sook,Kang, Keon Wook,Chung, June-Key,Kim, Euishin E.,Lee, Dong Soo Chapman and Hall in association with the British N 2014 Nuclear medicine communications Vol.35 No.5

<P>ObjectivesThe prevalence and risk of malignancy in thyroid incidentalomas has been investigated in previous studies; however, these studies have not looked at the characteristics of incidental thyroid cancer (ITC) detected by fluorine-18 fluorodeoxyglucose PET. Therefore, we aimed to assess the clinicopathologic features of ITC.MethodsFrom March 2008 to December 2011, a total of 2892 patients underwent total thyroidectomy for papillary thyroid cancer. Among them, patients belonging to the ITC group were defined as those in whom focal thyroid uptake was reported as an incidental finding on PET imaging and further evaluation revealed the presence of malignancy. In addition, two control groups with non-PET incidental thyroid cancer (NITC) were selected: NITC-A patients (n=48) who underwent a total thyroidectomy in March 2008 and NITC-B patients (n=48) who underwent a total thyroidectomy for papillary thyroid cancer and were matched for the confounding effects of age and sex.ResultsThere were no significant differences in clinicopathologic features, except for age and tumour node metastasis (TNM) staging, between ITC and NITC-A patients. More ITC than NITC-A patients were aged 45 years or older. Although T, N, or M staging was not different between ITC and NITC-A, there were more ITC patients with stage III/IV tumours. After matching for age and sex, none of the clinicopathologic features showed significant differences between ITC and NITC-B patients.ConclusionNo significant differences were observed between ITC and NITC patients except for age and TNM staging. More ITC patients had advanced TNM stage most likely due to patient age.</P>