실리콘樹脂를 利用한 文化財保護被膜에 對한 硏究

黃正儀,朴斗元,吳相午,鄭倧在,朴裕哲,郭永佑 慶北大學校 1977 論文集 Vol.23 No.-

金屬실리콘과 鹽化메틸을 鹽化第一구리를 觸媒로 하여 메틸실란을 合成하고 메틸실란을 加水分解하여 실록산의 被膜을 만드는 方法을 調査하였다. 이들 被膜이 文化財 保護被膜이 될 수 있는가를 檢討하기 爲해서 材料를 文化財의 材質인 몇 가지 物質에 適用하여 膜의 性能을 調査하였다. 特히 撥水效果, 汲水量 耐久性等을 調査하였으며 外觀上 아무런 變化가 없는 좋은 被膜이 될수 있다는 結果를 얻었다. The organohalogensilicone was synthesized metal silicone and methylchloride applying the direct synthetic method using copperous chloride as catalyzer. The synthesized organosilane was hydrolyzed to siloxane by various method and coated on various materials which are composed of the cultural assets. The coating film was examined to decide whether it is profitable one to protect the assets from efflorescence or air pollution. Referring to the water repellency, permiability of water and the weather test of the film it was qualified that this film was good enough to apply to the cultural assets as protecting film.

전도도법에 의한 치환 피리딘들의 해리상수 측정과 그의 온도와 압력에 따른 영향

黃正儀,鄭倧在,金學成,尹永炷,朴義煥 慶北大學校 物理化學硏究所 1985 硏究論文集 Vol.6 No.-

Generally, pyridine and most of substituted pyridines act as base in aqueous solutions. The strengths of their basicities can be expressed quantitatively by the dissociation constant of base or its conjugated acid. Generally, the acidity of substituted pyridines can be expressed by K_a of the following reaction. ◁그림삽입▷(원문을 참조하세요) The dissociation constants of these subtituted pyridines have not been reported under high pressure but under atmospheric pressure. In this papers, the dissociation constants of some substituted pyridines were measured under high pressure by the conductometry. From the ionic conductivity of hydrogen ion, the dissociation constants(K_a) were calculated. The K_a values were increased with increasing temperature and were decreased with increasing pressure. The characteristics of dissociation process of some substituted pyridines were deduced from the thermodynamic properties calculated from the dissociation constants.

高壓下에서 電池 Pb(Hg)|PbX_2(m), AgX(s)|Ag(X=Cl, Br, I) 및 Hg|Hg_2Cl_2(s)KCl(m), AgCl(s)|Ag의 起電力과 그의 熱力學的 性質

黃正儀,池鍾基 慶北大學校 産業開發硏究所 1975 硏究報告 Vol.3 No.-

Appling the complete quilibrium constant to the electro-cell reaction, it was derived that the standard electromtive force of the cell at high pressure(1―2, 500 bars). This theory was briefly discussed and applied to some cells such as, Pb|PbX_2(m), AgX(s)|Ag(X=Cl, Br and I)and Hg|Hg_2Cl_2(s), KCl(m), AgCl(s)|Ag. The results were conterminous as the previous results which applied to some other cells i.e. the electromotive force of the cells were increased as the pressure and temperaure increase except the PbCl_2 cell. The net change of the hydration number of the cell reaction were 26.1 for PbCl_2, 23.5 for PbBr_2 and 26.9 for PbI_2 cell, respectively. From the k-values the standard electromotive force and some other related thermodynamic values were calculated.

기전력법에 의한 페놀 및 2-염화페놀의 해리반응에 미치는 압력의 영향

황정의,정종재,차성극 慶北大學校 1983 論文集 Vol.35 No.-

The dissociation constants of phenol and o-chlorophenol were measured by emf method and compared the effects of temperature and pressure with the ordinary state. The constants are varied with the temperature and pressure, i. e. those values are increased as the both temperature and pressure increased. As the hydrogen ion reverisible electrode, antimony-oxide electrode is qualified until pressure to 2,000 bar in ordinany temperature but at 35℃ only to 1,500 bar. From the observed constants, various thermodynamic properties are calculated and discussed on the dissociation reaction.

海水로부터 우라늄의 濃縮分離

黃正儀,鄭倧在,李興洛 慶北大學校 文理科大學 1978 文理學叢 Vol.5 No.-

The present demand for all civil and military purpose exceeds a Korean surplus of uranium resources. Natural sea water is known to contain uranium in the mean concentration of about 3.3 ㎍ U/㎏ in the from of UO_2(CO_3)_3^4- solution. Though sea water has its trace quantity of uranium, its recovery by extraction method and untilization as energy sources at present is very remarkable in many nations. In this paper it was surveyed systematically the present world status in the extraction studies of uranium from sea water. Only a simple batch technique is described here, which permits an extraction of uranium from artificial and natural sea water. The basis of the technique is adsorption of the uranyl ion (UO_2(CO_3)_3^4- on solid adsorbent. The adsorbents were five kinds of activated TiO_2·H_2O series, titanium trihydroxy phosphate, zirconyl pyrophosphate, and zirconyl hydroxide. Of these adsorbents the most active material was TiO_2·H_O precipitated from the dissolved K_2TiF_6·H_2O in the 1 : 4 H_SO_4 aqueous solution by adding (NH_4)_2CO_3 solid until the pH of the filtered solution became 5.2. This extraction technique was successful to applying to the Korean beach sea water at Bizindo, Hansan-myun, Tongyung-gun, Kyungsangnam-do.

팟캐스트 제작 독서 활동 프로그램의 효과에 관한 연구 - 독서 태도와 의사소통 능력을 중심으로 -

황정의,조미아,Hwang, Jeong-Eui,Cho, Miah 한국도서관정보학회 2021 한국도서관정보학회지 Vol.52 No.3

이 연구의 목적은 팟캐스트 제작 독서 활동 프로그램이 초등학교 고학년 학생의 독서 태도와 의사소통 능력에 어떠한 영향을 주는지 효과를 규명하는 데 있다. 이러한 목적을 달성하기 위해 서울시 N 공공도서관에서 초등학교 고학년 학생 20명을 대상으로 실험집단과 비교집단으로 나누어 프로그램을 운영하고 효과를 분석하였다. 총 연구 기간은 2018년 10월 8일부터 2019년 2월 11일까지이며, 수업은 주 1회 90분, 집단별 6회, 총 12차시로 진행되었다. 연구 결과는 다음과 같다. 첫째, 팟캐스트 제작 독서 활동 프로그램은 초등학교 고학년 학생의 독서 태도에서 가치영역, 동기·흥미 영역, 습관·태도, 기대영역 등 4가지 영역 모두에서 긍정적인 영향을 미친 것으로 나타났다. 둘째, 의사소통 능력에서 정보수집과 경청, 고정 관념적 사고극복, 창의적 의사소통, 자기 드러내기, 주도적 의사소통, 타인 관점 이해 등 7개의 하위영역 모두에서 긍정적인 영향을 주는 것으로 나타났다. 결론적으로 팟캐스트 제작 독서 활동 프로그램은 초등학교 고학년 학생의 독서 태도와 의사소통능력, 미디어 능력 등에 긍정적인 영향을 주었으며, 다양한 교육 현장의 적용에 있어 효과적임을 시사하고 있다. The purpose of this study is to investigate the effects of podcast-produced reading activity programs on reading attitudes and communication skills of high-grade elementary school students. To that end, 20 fifth and sixth graders applied for a reading culture program conducted at N Public Library located in Seoul, Korea, were assigned as experimental and control groups. The total research period is from 8 October 2018 to 11 February 2019. and the class was conducted once a week for 90 minutes, six times for each group, and a total of 12 sessions. The results of this study can be summarized as follows; First, it was found that the reading activity program produced by podcast had a positive effect in all four areas: value domain, motivation·interest domain, habit·attitude, and expectation domain in the reading attitude of high-grade in elementary school. Second, communication skills were found to have a positive effect in all seven sub-areas, such as information collection and listening, overcoming stereotyped thinking, creative communication, self-disclosure, leading communication, and understanding of others' perspectives. In conclusion, the podcast-produced reading activity program had a positive effect on the reading attitude, communication ability, and media ability of high-grade in elementary school, suggesting that it is effective in applying various educational fields.

Polarograph법에 의한 Cadmium-Acetato Complexes에 관한 연구

황정의,정종재,손무룡,박유철 慶北大學校 1969 論文集 Vol.13 No.-

HAc와 NaAc용액을 혼합한 완충용액에서 Hume과 DeFord의 Polarograph 법으로Cadmium의 Acetato Complex의 안정도상수 및 그 조성을 Ion 강도 0.4, 0.7 및 2.0와 15℃, 20℃, 25℃ 및 30℃ 의 온도에서 각각 측정하였다. 초산Ion의 농도가 약 0.2 mole/ℓ 이상에서는 CdA_c^+, CdA_c2 및 CdA_c3- 3종의 착체가 존재하나 약 0.2 mole/ℓ 이하에서는 CdA_c3- 착체는 존재치 않는다. 실험범위내에서 측정된 안정도 상수(K_ijk)와 (T_k)사이에는 Log K_ik=A_i/T_k+B_i란 일반식이 성립하여 안정도상수와 Ion강도 (μj) 사이에는 LogK_ij=A_iμj+B_i란 일반식이 주어짐을 알았다.

유기산의 해리평행에 미치는 치환기효과와 그의 온도 및 압력의 영향. (5) 수용액에서 루신의 해리상수

황정의,이우붕,조점제,Jung-Ui Hwang,Wo-Bung Lee,Jeum-Jae Cho 대한화학회 1987 대한화학회지 Vol.31 No.5

루신의 해리상수를 전도도법을 이용하여 온도(15 to 40$^{\circ}$C)와 압력(1~2,500bar)을 변화시키면서 측정했다. 루신의 두가지 해리상수는 온도가 높아지면 모두 증가하였다. 그러나 압력이 높아지면 첫째 해리상수는 증가하였으나 둘째 해리상수는 낮은 온도에서는 감소하고 높은 온도에서는 증가했다. 이들 해리상수를 이용하여 해리반응의 열역학적 성질들을 계산하고 이들 성질로부터 해리반응의 특성을 알아보았다. The two dissociation constants of leucine were measured in the temperature range from 15 to 40$^{\circ}$C and pressure up to 2,500 bar by conductometric method. Both constants were increased as the temperature increased but pressure effect was not same as temperature effect. The first constants were increased as pressure increase but the second constants were decreased as pressure increase in the law temperature range but increased in some higher temperature range. These phenomena were discussed from the thermodynamic properties of the dissociation reactions.

유기산의 해리평행에 미치는 치환기효과와 그의 온도 및 압력의 영향. (6) 수용액중에서 몇가지 아미노산의 해리상수

황정의,이우붕,채종근,김학성,Jung-Ui Hwang,Woo-Bung Lee,Jong-Keun Chae,Hak-Sung Kim 대한화학회 1987 대한화학회지 Vol.31 No.5

세가지 아미노산 즉 글리신, 알라닌 및 트립토판의 두가지 해리상수를 전도도법을 이용하여 온도(15 ~ 35$^{\circ}$C)와 압력(1~2,500bar)을 변화시키면서 측정하였다. 두가지 해리상수는 온도가 높아지면 모두 증가했으나 압력이 높아지면 첫째 해리상수는 증가하고 둘째 해리상수는 트립토판을 제외하면 감소하였다. 이와같은 현상은 반응의 열역학적 성질을 이용하여 설명하였으며 나아가서 반응의 특성을 알아보기 위해서 Hammett의 법칙을 적용하고 반응의 치환기 상수와 압력에 따른 반응상수를 계산하였다. 아미노산의 해리상수의 특성을 치환 효과로 설명하였고 반응의 유형을 반응상수로서 알아보았다. The two dissociation constants of three amino acid, glycine, alanine, and tryptophan were measured by the conductometric method in the temperature from 15 to 35$^{\circ}$C and pressure up to 2,500bar in aqueous solution. The both dissociation constants were increased as the temperature increased but the pressure effect were not same as the temperature effect. The first constants were increased as the pressure increased but second constants were decreased except tryptophan. The characteristic properties of these amino acids were discussed from the thermodynamic properties of the dissociation reaction. The substituted effects of the reaction were deduced from Hammett reaction and substituted constants which were calculated from the dissociation constants.

國産無煙炭의 燃燒反應機構에 關한 硏究

황정의,손무용,Hwang Jung Euy,Son Moo Young 대한화학회 1972 대한화학회지 Vol.16 No.5

DTA에 衣한 國産無煙炭의 燃燒反應過程을 速度論的으로 解析할 수 있는 아래의 關係式을 導出하였다. $K=\frac{C_3{\cdot}W_0}{{\Delta}H{\cdot}{\Delta}C{\cdot}M{\cdot}S_A}(\frac{dy}{dt}+A(y-y_3))$ 이 式을 利用하여 各炭種에 對한 活性化 energy값을 求한 結果 非黑鉛性炭種은 40Kcal/mole, 黑鉛性炭種은 45Kcal/mole로서 炭化度가 增加되면 活性化 energy값이 增加된다는 것을 알았다. 無煙炭을 空氣中에서 燃燒시킬때 溫度에 衣하여 d_{(002)}$ X-線回折强度가 점차적으로 커지는 現象으로부터 無煙産中의 一部가 層構造(黑鉛化)로 變化됨을 알았으며 이 變化된 層構造에 生成된 $CO_2$의 一部가 接觸分解되어 다시 CO로 환원됨을 알았다. 그리고 無煙炭의 反應性을 左右하는 活性基의 種類는 -OH, -SH, -NH, -$CH_2-CH_3,$ 및 -CO, -COC-, -COOH가 存在하며 IR 로서 炭化度를 測定할 수 있었다 The rate Constants and energies of activation for the Combustion reaction of Korean anthracites have obtained by DTA method using the following rate equation derived by authors. $K=\frac{C_3{\cdot}W_0}{{\Delta}H{\cdot}{\Delta}C{\cdot}M{\cdot}S_A}(\frac{dy}{dt}+A(y-y_3))$ The anthracites of various ranks were treated at the different temperatures in the furnace. The probable combustion reaction mechanisms have discussed with the results obtained by the X-ray diffraction method, IR spectroscophic analysis, and gas chromatography. By the intensity of d(002) Values, it was confirmed that a parts of the amorphous carbon was converted to graphite form by heat treatment. The appreciable amounts of CO gas were expelled in the combustion process and it appeared that a little amount of the gas came from the catalytic decomposition of anthracites, The functional groups such as -OH, -SH, -NH, $-CH_2-CH_3,$ -CO, -COC-. and polycondensed aromatic rings in anthracites have observed by IR spectrophotometric analysis.