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.

충주 온천지역의 관광환경자원의 과학적 평가 : 타 온천 지역과의 대기오염상태 비교 Comparison of Atmospheric Environmental State

조일환,전태성,허억 건국대학교 의과학연구소 2003 건국의과학학술지 Vol.13 No.-

Since the concept of clean air at hot spring resorts in Chungju city depends upon the scientific evidence of air pollution state, the atmospheric data at this city should be compared with other cities. The aim of this study was to investigate a degree of atmospheric cleanness at Chungju city comparing with other ones. The measurement results at this city showed the concentration of sulfur dioxide (S0_2; 0.0043 ppm/yr ~ 0.04 ppm/yr), total suspended particulate(TSP; 38.5 ㎍/m^3/hr ~ 90 ㎍/m^3/hr), ozone(0_3; 0.0133 ppm/hr ~ 0.0267 ppm/hr), nitrogen dioxide(N0_2; 0.0078 ppm/yr ~ 0.037 ppm/yr), and carbon monoxide(CO; 3.9 ppm/hr - 21.2 ppm/hr). The atmospheric cleanness at Chungju is involved in high group (p<0.05; high group vs low group) among the hot spring resort cities - Changwon, Seoul, Pusan, Soowon, Taejon, and Kangrung. As Chungju has a lake and less developed manufacturing area, the establishments of frontier industry, the leisure industry, the spa-medical industry and education facilities are strongly recommended for the municipal policy of the city.

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.

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.

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.

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.

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.

ASOG 그룹기여법에 의한 공비혼합물의 공비점 추산에 관한 연구

趙泰煥 단국대학교 1987 論文集 Vol.21 No.-

Phase equilibrium data are very impotant and useful for designing separation process of operation, for example, vapor liquid equilibrium data for distillation and solid liquid equilibrium data for drystallization. However only limited experimental data are available for any particular conditions of temperature, pressure and composition that are required for particular design. The ASOG model is one of the useful methods to interpolate or extrapolate the existing mixture data, or when the suitable data or not available, to estimate the desired equilibrium data. By the ASOG method is based on the "solution of group" model, liquid phase activity coefficients were predicted in terms of the parameters associated with the pairs of scutrutal groups of the solution. The paramesers have been determined for 31 groups of the group dair parameters using vapor liquid equilibrium data. The existence and nonexistence of azeotropes were judged by the azeotropic formative condition. for prediction of the azeotropic point, I have chosen an abjective function F=ly_1-x_1/x_1 that have calculated by the Regular-Falsi method.

전통 곶감의 수출시장 소비자선호 분석

조재환,김태균,박준형 한국농업정책학회, 한국축산경영학회 2001 농업경영정책연구 Vol.28 No.3

This study analyzes the foreign consumers' preferences and the willingness to pay for the Korean traditional dried persimmons by conducting surveys to Japanese, Americans, Canadians, Europeans, Australians, and New Zealanders. The results show that the potential export demand is largest to Japanese and those to U.S. and Europe are sufficient. The results also indicate that the price has to be reduced and the quality has to be improved in order to extend the export demand for the Korean traditional dried persimmons.

밤나무 耐寒性品種 選拔에 관한 硏究 : 耐霜性을 中心으로 Castanea crenata S. et Z.

趙台煥,洪性珏 건국대학교 1980 學術誌 Vol.24 No.2

Seasonal change in freezing resistance of buds and xylem parenchyma of 32 chestnut cultivars (Castanea crenata S. et Z.) were studied during winter of 1977 to 1978. Dehardening responses of the hardened twigs in mid-winter were examined by being exposed to high temperature of 20℃ for 3 to 15 days. Rehardening responses of the artificially or naturally dehardened twigs were tested by being exposed to short or long-term low temperatures of 7℃ or -10℃. The freezing resistance of graft unions of two cultivars was compared to that of the upper and lower parts of twigs of the seedlings at mid winter and early spring. Variation in freezing resistance among 32 chestnut cultivars at the late fall of 1977 and the early spring of 1978 were much greater than that of the early and mid-winter. The little variation in freezing resistance at mid-winter suggested that in selecting most cold hardy cultivar the speed of hardening and dehardening in cold and warm condition respectively are more important factors than the magnitude of maximum freezing resistance which could have been obtained during mid-winter or by artificial hardening, The warm temperature of 20℃ for 3 to 15 days decreased freezing resistance of the fully hardened twigs at mid-winter. The low temperature of 7 or -10℃ in short or long term increased freezing resistance of the twigs which had been dehardened either by artificial high temperature treatment or by natural conditions in early spring. The difference in freezing resistance in early spring among cultivars coincided with the difference in the sensitivity in hardening by the low temperature treatment and/or in delaying dehardening by warm temperature treatment. In the late fall and the early spring buds of all cultivars showed less freezing resistance than xylem parenchyma. In the contrast the xylem parenchyma became less hardy than the buds as the cold acelimation progreesed toward mid-winter and as the rehardening occurred on the dehardened twigs at early spring by low temperature treatment. In graft unions the upper parts of twigs showed more freezing resistance than graft parts in mid-winter. But in early spring the cold hardiness of the two parts are conversely changed each other. This phenomena frill be a good index for distinguishing midwinter from late frost damage.