A study on the crystallizations of synthetic zeolites from orthoclase, halloysite and quartz by x-ray powder diffraction analysis : 고령토, 장석 및 규석으로 부터의 합성zeolites의 결정화에 관한 연구

Suh, Gil Duk 부산대학교 1978 論文集: 自然科學篇 Vol.25 No.-

Formaline 縮合에 있어서의 pyridine의 觸媒作用 : Formaline 축합에 있어서의 pyridine의 촉매작용

Byung-Kyu Kim ; Nae-Yeong Choi ; Gil-Duk Suh 釜山大學校 工科大學 1975 工科大學 硏究 報告 Vol.14 No.-

증류탑 간이 설계법

서길덕,박인수 한국화학공학회 1981 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.19 No.1

새로운 증류탑 간이 설계법이 개발되었다. (수식) 이 모델은 2성분계 뿐만 아니라 다성분계에서도 유용하다. A new short-cut method for distillation column design has been developed to calculate the number of theoretical plates. The proposed model is as follows: (수식) This model is useful for multicomponent systems as well as binary systems.

이원세공 고분자수지 충전층에서 모멘트방법에 의한 물질전달 파라메타의 추산

서길덕,박인수 한국화학공학회 1984 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.22 No.5

이원세공조체 충전층에서 기체의 물질전달파라메타를 추산하기 위한 모멘트식을 유도하였다. 이 모델은 마크로세공 표면의 표면확산과정을 포함한다. 이 모델로써, 이원세공 고분자수지인 Amberlite XAD-2 충전층에서 CO₂의 물질전달파라메타를 만족스럽게 추산할 수 있었다. 소량흡착기체인 Ar의 모멘트 해석으로 얻은 마크로세공의 굴곡도는 2.40이었다. 흡착열은 -4.2㎉/㏖이었다. 마이크로세공확산계수, Di/r²o은 30℃에서 0.22 sec^(-1), 활성화에너지는 7.3㎉/㏖이었다. 그리고 마크로세공표면확산계수는 30℃에서 6.0×10^(-4)㎠/sec, 활성화에너지는 2.7㎉/㏖이었다. In order to estimate mass transfer parameters of a gas in a fixed bed of solid with bi-dispersed pore structure, we derived new moment equations. The model contains the surface diffusion process on the surface of macropore. With the model mass transfer parameters of CO₂ in the fixed bed of bi-dispersed polymer resin, XAD-2, was estimated satisfactory. Macropore tortuosity factor was 2.40, which was obtained by moment analysis of nearly nonadsoring gas, Ar. Heat of adsorption was -4.2 ㎉/㏖. Micropore diffusivity, D_i/r²o, was 0.22 sec^(-1) at 30℃ and the activation energy was 7.3 ㎉/㏖. And macropore surface diffusivity was 6.0 × 10^(-4) ㎠/sec at 30℃ and the activation energy was 2.7 ㎉/㏖.

함수 산화티탄(Ⅳ)에 의한 우라늄의 흡착

서길덕,김종현,허광선 한국화학공학회 1990 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.28 No.3

해수 중에 용존하고 있는 우라늄 채취용 흡착제 개발과 공정의 기초자료를 얻기 위하여 출발물질인 titanium(IV) alkoxides을 가수분해 온도별로 제조하여 얻은 함수 산화티탄(IV)을 그의 물성과 우라늄의 흡착량, 흡착평형과 흡착과정의 율속단계, 유효 세공용적 확산계수 등을 측정하였다. 흡착제의 물성은 가수분해 온도, 출발물질에 따라 영향이 있었으며, titanium(IV) alcoxides 중에서 높은 가수분해 온도로 TTPO에 의해 조제된 함수 산화터탄(IV)이 TTIPO와 TTBO로 조제한 것보다 우라늄 흡착제로서 가장 우수한 흡착능을 보였으며, 조제시의 가수분해 온도와 흡착온도가 증가할수록 흡착량이 증가하였다. 우라늄에 대한 흡착 평형관계는 Freundlich 등온식을 따르며, 흡착열은 흡열반응이었고, 이 때 Freundlich constant(1/n), 흡착열 및 활성화에너지는 각각 0.11-0.28, 1.11-7.54㎉/㏖, 0.96-1.97㎉/㏖ 범위이었다. 함수 산화티탄(IV)에 대한 우라늄의 흡착과정은 세공용적 확산율속이며, 유효 세공용적 확산계수는 7.5×10^(-7)-2.24×10^(-5) ㎠/sec 범위이었다. In order to develop an effective adsorbent for the recovery of dissolved uranium in sea water, hydrous titanium(IV) oxides were prepared by the hydrolysis of titanium(1V) alkoxides under aqueous alkaline solution. Effects of hydrolysis temperature on the adsorptive characteristics of adsorbents were investigated in terms of the physical properties of adsorbents and the mechanism of adsorption. The physical properties of hydrous titanium(IV) oxides are dependent on starting material and hydrolysis temperatures. Hydrous titanium(IV) oxide prepared by TTPO at high hydrolysis temperature was more effective for the adsorption of uranium than that prepared by either TTIPO or TTBO. The amount of uranium adsorbed on hydrous titanium(IV) oxides increased with rising hydrolysis and adsorption temperature. Adsorption equilibrium relation and heat of adsorption for uranium were correlated with Freundlich equation and endothermic process respectively. Freundlich constant(l/n), heats of adsorption and activation energy values were ranged 0.11-0.28, 1.11-7.54 ㎉/㏖ and 0.96-1.97 ㎉/㏖ respectively. The mechanism of adsorption of uranium on hydrous titanium(IV) oxides were elucidated as intraparticle diffusion controlling, an effective pore volume diffusivities were ranged of 7.5×10^(-7)- 2.24×10^(-5)㎠/sec.

Amidoxime 형 수지에 대한 우라늄의 흡착

서길덕,허광선 한국화학공학회 1991 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.29 No.1

해수 우라늄 흡착제 개발과 공정의 기초 자료를 얻기 위하여 amidoxime기를 갖는 MR형 킬레이트수지를 가교도 변화에 따라 amidoxime형 수지를 합성하여 이 수지에 대한 물성, 우라늄의 흡착평형, 홉착능 및 흡착과정을 고찰하였다. Amidoxime형 수지의 물성과 우라늄의 흡착능은 가교도 변화에 따라 영향이 있으며 RNH-17.5인 경우가 가장 우수한 흡착능을 보였다. Amidoxime형 수지에 대한 우라늄의 흡착은 화학적 구조 뿐만 아니라 물리적 구조에도 영향이 있으며 흡착평형과 흡착과정은 각각 Freundlich등온식과 세공용적 확산율속과정으로 이때 의 Freundlich상수(1/n)과 유효세공확산계수는 0.058-0.236, 0.17-1.266×10^(-7)㎠/sec이였다. In order to develop an effective adsorbent for the recovery of dissolved uranium in seawater, the macroreticular acrylonitrile(AN)-divinylbenzene(DVB) copolymer beads were synthesized by suspension polymerization in the presence of toluene as diluent. The macroreticular chelating resins(RNH) containing amidoxime groups with various degree of crosslinking were prepared by the reaction of AN-DVB copolymer beads with hydroxylamine in methanol. The effect of degree of crosslinking on the physical properties, adsorption equilibrium, adsorptive ability and adsorption mechanism for uranium of amidoxime type resin(RNH) were investigated. The chemical and the physical properties and adsorptive ability of uranium on amidoxime type resin were effected by various degree of crosslinking. The adsorption of uranium on amidoxime type resin was not only effected by the chemical structure but also by physical structure. Equilibrium and mechanism of adsorption of uranium for amidoxime type resin were correlated with Freundlich equation and intraparticle diffusion controlling respectively and Freundlich constant(1/n) and effective pore volume diffusivities were ranged of 0.058-0.236 and 0.17-1.266×10^(-7)㎠/sec.

Effect of spatial molecular configuration of ZnO/ polyethylenimine hybrid electron injection materials on OLEDs performance

Park, Sunjoong,Suh, Minwon,Kim, Kyungmok,Kim, Moohyun,Cho, Hyunjin,Shin, Hongjoo,Seo, Han Gil,Jung, WooChul,Jeon, Duk Young Elsevier 2019 Organic electronics Vol.75 No.-

<P><B>Abstract</B></P> <P>Solution-processable charge injection materials have gathered considerable attention in the field of organic optoelectronics owing to their ability to enhance device efficiency. Of those candidates, polyethylenimine (PEI) polymers have been widely explored, but their effect on the device physics in organic light-emitting diodes (OLEDs) are not completely elucidated yet. In this work, the impact of ZnO:PEI hybrid nanocomposite as an electron injection layer (EIL) of OLEDs on the device performance is investigated. Two different PEIs with the different spatial molecular configuration of the polymer, either linear or branched-type, are employed. Both PEI polymers have the ability to effectively reduce the work-function of ZnO. The ZnO:linear-PEI EIL shows higher device efficiency in comparison to the ZnO:branched-PEI EIL in the charge-balanced OLEDs, whereas the results are opposite in the charge-imbalanced device setup. This is mainly due to the different role required of EIL materials upon different device working mechanisms. This work shows a series of experimental results of the detailed device characteristics using ZnO:PEI hybrid EILs in order to provide a systematic understanding of the device physics by combining two key concepts together; (1) control of the molecular configuration, and (2) charge carrier dynamics.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We investigate ‘device characteristics’ by using two different types of ZnO:PEI (branched PEI (BPEI) or linear PEI (LPEI)) as an electron injection layer (EIL). </LI> <LI> ZnO:LPEI offers better electron injection ability. In contrast, ZnO:BPEI performs better when playing both roles; electron injection and hole blocking. </LI> <LI> ZnO:LPEI shows higher device efficiencies compared to ZnO:BPEI in the charge-balanced OLEDs whereas it is opposite in the charge-imbalanced OLEDs. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Impact of the spatial configuration of macromolecules of ZnO:polyethyleneimine (PEI) hybrid electron injection materials on OLED device performance is examined.</P> <P>[DISPLAY OMISSION]</P>

인사평가 만족도의 영향요인에 관한 연구

서인덕(In-Duk Suh),이상길(Sang-Gil Lee) 한국경영사학회 2011 經營史學 Vol.60 No.-

이 연구는 평가자 인적요인(평가경험, 평가교육, 평가책임감)과 평가정황 요인(평가도구 정확 성, 평가피드백, 평가시스템 우월성)이 피 평가자의 평가만족도에 미치는 영향을 실증적으로 분석 한 것이다. 분석에 사용한 자료로는 우리나라 공군의 대위급 이상 장교와 부사관을 대상으로 군내 인트 라넷을 통한 설문조사에서 유효한 1,248개의 응답 내용을 활용하였으며 변수간의 영향력 분석을 위해 회귀분석을 하였다. 주요한 분석 결과는 평가도구 정확성(β = .328, p < .01), 평가책임감(β = .228, p < .01), 평가시스템 우월성(β = .195, p < .01), 평가피드백(β = .123, p < .01) 및 평가경험(β = .081, p < .01) 등이 피 평가자의 평가만족도에 유의한 정의 영향을 미치는 것으로 나타났다. 이러한 분석 결과가 주는 함축적 의미와 연구의 한계점이 함께 제시되었다. This study tested relationships of rater’s personal factors and organizational context factors regarding appraisal with ratees’s perceived satisfaction of performance appraisal. The data analysed for the study were collected from the ROK Air Force Officers of Captain or above and Warrant Officers from Headquarters and subordinate units who responded the Intranet electronic questionnaire survey. The effective 1,248 cases were used for regression analysis to investigate the relationship between rater’s personal factors(experience of appraisal, education for proper rating, responsibility for rating) and organizational context factors regarding appraisal (accuracy of appraisal instruments, appraisal feedback, usefulness of appraisal) with ratees’s perceived satisfaction of performance appraisal. The results of regression analysis were as follows : Accuracy of appraisal instruments(β = .328, p < .01), responsibility for rating(β = .228, p < .01), usefulness of appraisal(β = .195, p < .01), appraisal feedback(β = .123, p < .01), and rater’s experience of appraisal(β = .081, p < .01) all had significant positive effects on ratees’s perceived satisfaction of performance appraisal. But education for proper rating showed no significant influence on it. The implications and limitations of this study were also suggested.

Amberlyst 15 충전층에서 질소의 확산 및 분산계수

박인수,서길덕 한국화학공학회 1982 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.20 No.5

단일 세공 구조를 가진 다공성 고분자 수지 충전층에서 기체의 세공 확산계수와 겔 확산계수를 동시에 추산할 수 있는 동적 모델을 개발하였다. 이 모델은 이중 세공 구조를 가진 다공성 고체충전층에서 기체의 펄스-응답 특성을 나타내는 Kubin-Kucera 모델과 수식적으로 동일하다. Amberlyst 15-N₂계의 과도응답을 모멘트 법으로 해석하여 10^(-2) order of magnitude의 D_i/ro²값을 얻었으며, 겔 확산계수의 온도 의존성은 Arrhenius 식으로 나타낼 수 있었다. A dynamic model was developed by applying Kubin-Kucera model in case of th porous solid with bimodal pore structure-gas system to the porous polymer resin with unimodal pore structure-gas system. With the model pore diffusivity and polymer gel diffusivity in fixed bed of porous polymer resin can be estimated simultaneously. Analysing the transient response of Amberlyst 15-N₂ system by means of moment analysis, we obtained the D_i/ro²value of 10^(-2) order of magnitude. And the temperature dependence of the gel diffusivity was represented by Arrhenius' equation.

Formaline 縮合에 있어서의 Pyridine의 觸媒作用

김병규,최내영,서길덕 부산대학교 공과대학 부설 생산기술연구소 1975 硏究報告 Vol.14 No.-

본 보문에서는 산화납, 피리딘 단독촉매및 산화납-피리딘 공촉매 존재 하에서 포름알데히드 수용액의 알돌형 축합을 시행하여 박층크로마토그라프 법으로써 축합생성물을 분리하고 반응속도 정수 및 활성화에너지를 구한 결과를 다음과 같이 보고한다. 1. 피리딘은 포름알데히드의 이량화반응에는 전혀 촉매능이 없었으며 디히드록시아세톤의 이량화 반응및 키시로즈-포름알데히드의 축합반응에는 상당한 촉매능을 보여 케토-헥소즈를 생성하였다. 2. 초기축합반응은 포름알데히드의 농도에 대하여 외견상 2차 반응이었다. 3. 45℃=65℃에서 반응은 Arrhenius식에 잘 맞았으며 반응속도 정수및 활성화에너지는 다음과 같았다. k_(pbo), 338˚k=10.1×10^(-3), k_(pbo, 328˚k)=7.2×10^(-3), k_(pbo), 318˚k=5.6×10^(-3), k_(pbo-pγridine, 338˚k)=9.6×10^(-3), k_(pbo-pγridine,328˚k)=7.0×10^(-3), k_(pbo-pγridine, 318˚k)=5.1×10^(-3), unit;1 mole^(-1) sec^(-1) ΔE_(pbo)=7.8(Kcal mole^(-1)), ΔE_(pbo-pγridine)=8.3(")