天然 Kaolin으로부터 Zeolite Sodium A의 合成과 이온交換特性

趙泰煥,任宏 단국대학교 1988 論文集 Vol.22 No.-

The ion exchange behavior of various inorganic exchange and other types of various inorganic exchangers and other types of crystalline silicates such as clay minerals and feldspathoida has been extensively reviewed. Because of their three-dimensional framework structure, most zeolites and feldspathoids do not undergo any appreciable dimensional change with ion exchange; clay mineral, because of their two-dimensional structure, may undergo swelling or shrinking with cation exchange. The cation exchange behavior of zeolites depends upon (i) the nature of the cation species, the cation size, both anhydrous and hydrated, and cation charge; (ii) the temperature; (iii) the concentration of the cation species in solution; (iv) the anion species associated with the cation in solution; and (v) the structural characteristics of the particular zeolite. In the present paper zeolite sodium A was prepared from calcined kaolin in sodium hydroxide solution under the reaction condition of 0.5-6N NaOH, reaction time 0.5-12hr and reaction temperature 100℃. Also, the properties and structures of the exchanged zeolite sodium A with mercury, ammonium, potassium, and lithium ions were investigated. And the ion exchange capacities of synthesized zeolite sodium A from calcined kaolin and several aluminosilicates minerals for univalent mercury cation were studied by batch method. As a result, XRD, IR spectra, SEM and DTA measurements showed that the property and structure of zeolite sodium A synthesized from kaolin is similar to that of synthetic zeolite A (ZMS 4A). The optimum conditions for synthesizing zeolite sodium A were treated with aqueous 2N sodium hydroxide solution, reaction time 10-12hr at reaction temperature 100℃. And also the order of cation exchange selectivity in the synthesized zeolite sodium A, decreasing, is: Ag^+>K^+>NH^+>Li^+. For univalent mercury ion, the ion exchange selectivities in the synthesized zeolite sodium A and several aluminosilicates were decreasing in order of synthesized zeolite sodium A, alkali-treated clinoptilolite, clinoptilolite mineral, alkali-treated bentonite, kaolin mineral and bentonite mineral.

농아에서의 측두골 전산화 단층촬영 소견과 다른검사 요인과의 연관성

조태환,이상흔,권대구,엄규상,성창섭,김용선,한기원 경북대학교 병원 1998 경북대학교병원의학연구소논문집 Vol.2 No.1

Temporal bone high resolution computed tomogram(TBHRCT)is a essential diagnostic tool in considering for cochlear implantation in patients with profound sensorineural hearing loss. This study was designed for an effort to provide and efficacy of TBHRCT in determination of inner ear malformations for the patients who have profound sensorineural hearing loss and to examine the relationships between TBHRCT findings and other preoperative evalutions for cochlear implantation in that patients. Authors examined 68 deaf patients to provide fundamental data for cochlear implantation. Inner ear abnormalities were founded in 13(19%) patients, among which 10(14.7%) patients had Mondini'dysplasia in which 5 patients were hypoplastic type and 5 patients were hydrops type. Other inner ear abnormalities were as follows : lateral semicircular canal hypoplasia ; internal auditory canal abnormality ; cochlear aqueduct widening ; vestibular aqueduct widening. No relationships were found between TBHRCT findings and other test results. : promontory test, K-WISC cognitive test etc.(Korean J Otolaryngol 39 : 8, 1996)

원격탐사 기법을 이용한 도시토지환경 분석에 관한 연구

조영환,송태갑,홍현승 木浦大學校 沿岸環境硏究所 1998 沿岸環境硏究 Vol.15 No.1

This study compares the usefulness of remote sensing with that of aerial photography as a main data source for urban land analysis and development planning. The data was collected over inland districts under the administrative control of Mokpo city, but the results of the study are easily generalized. The main environmental factors considered were annual changes in vegetative ground covering, categorized into sectors according to the type of surface soil supporting it. Remote sensing techniques facilitated the collection of large amounts of data over a wide area in a relatively short time. Remote sensing data was also easy to collect repeatedly on an ongoing basis, making it useful as a fundamental data source for town planning and urban land development. On the other hand, aerial photographs offer a superior spatial perspective on urban lands, making them very useful as data for detailed planning in specific areas slated for intensive development.

소소흡장합금을 사용한 2차전지의 충방전특성

趙泰煥 단국대학교 1993 論文集 Vol.27 No.-

The optimal conditions for nickel-hydride secondary batteries were investigated in the ZrNi hydrogen absorbing alloys. The Zr_7Ni_10 and ZrNix(1.0≤χ≤3.0) allyos, electrochemical behaviour such as charged hydrogen contents by electrolysis, discharge characteristics and changes in the partial molar enthalpy and entropy with hydrogenation were investigated in an alkaline electrolyte. It was found that the ZrNi_x (1.0≤χ≤3.0) system alloys which consist of monoclinic ZrO_2 exhibit large discharged hydrogen capacities. Furthermore, from the values of the charged hydrogen contents and the results of the x-ray investigations.

만성 화농성 중이염의 세균학적 고찰

조남순,이영훈,강기훈,최제환,송태현,이병돈,장혁순,강주원,김연준 순천향의학연구소;Soonchunhyang Medical Research Institute 2000 Journal of Soonchunhyang Medical Science Vol.6 No.1

Background and Objectives : Chronic suppurative otitis media is one of the frequent diseases in otolaryngologic field. It is important to choose of antibiotics in the management of infectious disease. But the organisms in infections have been changed and resistance to antibiotics has been grown as the development of antibiotics has been achieved. And so it has been necessary to recognize the changes of organisms and resistance in antibiotics. Our study was performed to identify the pathogens isolated from discharges in chronic otitis media and evaluate the antibiotic agents, to recognize the change of to resistance to·antibiotic agents and to use the appropriate anitiotics. Materials and Methods : Retrospectively, authors reviewed the backeriologic study of 114 cases of chronic suppurative otitis media who visited the Department of Otolaryngology, Soonchunhyang University in Seoul from Nov. 1996 to Oct. 1999 and analyzed 101 strains and its sensitivity test to various antibiotics. Result : In 93 cases in which pathogenic organism was isolated, single infection was 85 cases(91.4%) and mixed infection was 8 cases(8.6%). The most frequent pathogenic organism was Staphylococcus aureus(59.4%), Pseudomonas aeruginosa(13.9%), Providencia(4.8%), Alcaligenes(3.0%) and Streptococcus pneumoniae(2.9%) were the next. Methicilline-Resistance Staphylococcus aureus was 34 cases(57.6%) of Staphylococcus aureus. Staphylococcus aureus was sensitive to Vancomycin(96.7%), Trimethoprim-Sulfamethoxazole (57.6%), Cefuroxime(42.4%) and Ciprofloxacin(40.7%) but resistant to Penicillin(94.9%). Pseudomonas aeruginosa was sentitive Amikacin(100%), Ciprofloxacin(100%) and Gentamicin(67%). Conclusion : As MRSA recently was wide spread in community accquired infection as well as nosocomial infection, we must consider strict control of MRSA.

밤나무 小枝에 있어서 梢頭部와 下端部의 耐凍性의 差異

趙台煥,洪性珏 건국대학교 1978 學術誌 Vol.22 No.1

Freezing resistance of winter bud and xylem at each tip, middle and base portion of current year twigs of 32 chestnut cultivars was measured on October 30, December 1,1977 and January 10, 1978. The bud and xylem collected on October 10 and bud on December 1, 1977 did not show consistant difference in freezing resistance among tip, middle and base portion of the twigs. Freezing resistance of the xylem collected on December 1,1977 and January 10,1978 was in order of tip, middle and babe portions from highest to lowest in most cultivars of chestnut. The importance of lower freezing resistance of the base portion than the tip was discussed to determine cold resistant cultivars and grafting methods of chestnut.

重化學工業機械의 國産化方案에 關한 硏究 : 特히 窯業에 있어서의 燒成爐, 粉碎機, 排風機, 冷却機, 電氣集마器 自動枰量供給器 等의 製作을 目的으로

趙哲衡,朴碩喆,丁太權,宋鐵,桭達福,金基玉,朴煥奎,趙煥從,朴善鐘,金種一,李茂錫 朝鮮大學校 1977 綜合論文集 Vol.1977 No.-

This is to investigate the posibility of home manufacturing of heavy chemical industry machines, such as rotary kiln, crusher, blower, cooler, electrostatic precipitator and weighing feeder of cement plant. It is concluded that even though we can not make all of them (some of them are made now and some others are going to be made in the near future, some of them are made whole and some others are made partially), we can build or export the cement plant by importing the important machines which we can not make now and by substituting them with ours gradually.

液相의 混合性이 한정된 系의 氣液平衡의 熱力學的 健全性評價에 관한 硏究

趙泰煥 단국대학교 1985 論文集 Vol.19 No.-

The experimental vapor liquid equilibrium data were Checked for thermodynamic consistency by means of the rigorous equation propose in this paper. The enthalpy of mixing data necessary for the consistency test, which was measured at 298.15K for MEK-Water system. The result of the consistency check of vapor liquid equilibrium data for MEK-water system in literature is summarized in Table 1.

수소흡장합금-수소계의 전극전위와 열역학적량에 관한 연구

趙泰煥 단국대학교 1992 論文集 Vol.26 No.-

Many Metals were tried to absorb hydrogen by the electrochemistry. It is practically difficult to discharge these hydrogen absorbing metals by the electrochemistry. It is the one of reasons that a bond energy of the metal and hydrogen in hydrogen absorbing metal is very strong. It is purpose to study the hydrogen energyed storage battery with the electrode of hydrogen absorbing alloy by making use of the principle which metalhydride of the alloy based LaNi_5 is charged by the cathod polarization and discharged by the anode polarization electrochemically in KOH Solution. It is measured the electrochemical eharge-discharge capacities and anodic polarization characteristies and isothermal curve of alloy-hydrogen system and thermodynamic properties from the equilibrium electric potentio of hydrogen absorbing alloys.

농촌관광에 대한 도시민 선호분석

조재환,김태균,박시현,박준형 한국농업정책학회, 한국축산경영학회 2003 농업경영정책연구 Vol.30 No.3

This paper analyzes urban residents' preference on rural tourism using a survey data. The results show that even though urban residents are unaware of rural tourism, people who have experienced rural tourism set a high value on it. Urban residents are willing to pay about 93,600Won for rural tourism. These results indicate that there is a lot of potential demand for rural tourism. The results of this paper could be an important information to develop the rural tourism.