축구선수의 Detraining과 Retraining이 혈청지질 및 호르몬농도에 미치는 영향

정정화,박재현,채종훈,성혜련,황지인,윤미숙,노금선,윤종관,윤영학,노순덕,정경숙,박일규,김은희,박현태,박상갑 대한스포츠의학회 1999 대한스포츠의학회지 Vol.17 No.1

The purpose of this study was to investigate the effects of detraining and retraining on serum lipid and hormones in soccer players. Subjects were seven male high-school soccer players. V˙O_2max was determined for each subjects by administering a treadmill test(initial speed: 90m/min, grade: 5%, increasing speed per 3 min: 30m/min). Serum lipid(T-C, TG, HDL-C LDL-C) and hormones(epinephrine, norepinephrine, growth hormones, cortisol) were assayed pre and post detraining in 10, 20, 30 days after retraining. The repeated ANOVA was used to determine significant differences. The 0.05 level of significance was as critical level for the study. The results of the study were as follows: 1. V˙O_2max(ml/min) were 3576.3±204.2ml/min pre detraining, 3234.1±198.9 ml/min post detraining. There are significant(p<.05) difference between pre and post detraining. In 10, 20, 30 days after retraining, V˙O_2max(ml/min) were 3601.4±170.9 ml/min. There were significantly(p<.05) increased in retraining periods. 2. V˙O_2max(ml/kg/min) were significantly(p<.05) decreased from 62.3±2.9 ml/kg/min to 55.9±4.7 ml/kg/min in detraining. In 10, 20, 30 days after retraining, V˙O_2max(ml/kg/min) were 62.4±3.4ml/kg/min, 62.7±2.3ml.kg/min, 67.3±7.2ml/kg/min respectively. There were significantly(p<.05) increased in retraining periods. 3. T-C were significantly (p<.05) increased from 166.6±8.5mg/dl to 175.3±10.3 mg/dl in detraining. In 10, 20, 30 days after retraining, T-C were 160.1± 3.2mg/dl, 156.7±3.7mg/dl, 140.3±9.0mg/dl. There were significantly(p<.05) decreased in retraining periods. 4. HDL-C were 61.4±6.6mg/di pre detraining, 5.3±6.6mg/dl post detraining. There are significant(p<.05) difference between pre and post detraining. In 10, 20, 30 days after retraining, HDL-C were 56.9±7.1mg/dl, 56.4±9.2mg/dl, 57.7±9.1mg/dl respectively. There were no significant difference in retraining periods. 5. The hormones(epinephrine. norepinephrine, growth hormone, cortisol) were changed as same patterns. Epinephrine were 26.0±7.0[g/ml pre detraining, 24.6±3.2pg/ml post detraining. In 10, 20, 30 days after retraining, epinephrine were 26.9±5.6pg/ml, 30.6±6.2pg/ml, 29.4±5.6pg/ml respectively. There were no significant difference in retraining periods. In conclusion, HDL-C, epinephrine, norepinephrine, growth hormone and cortisol were decreased, T-C, LDL-C and TG were increased in detraining. But HDL-C, epinephrine, norepinephrine, growth hormone and cortisol were increased, T-C, LDL-C and TG were decreased in retraining.

특수학교(급)고등부 졸업생의 진로실태 및 진로 지원체제 구축방안 : Future Directions and Practices for Developing a Comprehensive Career Support System in Special Education School

정희섭,김현진,김형일,정동영,정인숙 국립특수교육원 2005 연구보고서 Vol.- No.11

이 연구는 장애인 삶의 질을 보다 확충하는 차원에서 특수학교(급) 고등부 졸업생의 진로 실태를 분석하고, 그 결과를 기반으로 현실여건에서 최상의 진로 지원체제 구축방안을 마련 하는데 목적을 두고 수행되었다. 이 연구는 목적의 달성을 위해 문헌고찰을 통해서 진로실태 분석모형을 개발하고 진로 지원체제 구축을 위한 요인을 발굴한 이후, 최근 5년간 전국 특수학교(급) 고등부 졸업생을 대상으로 전반의 진로실태를 조사?분석하고, 문헌분석 및 실태조사를 통해서 도출된 결과를 중심으로 학교와 지역이 연계된 진로 지원체제 구축 방안을 제시하였다. 먼저, 특수학교(급) 고등부 졸업생의 진로 실태에 대한 조사 결과를 제시하면 다음과 같다. 특수학교(급) 고등부 졸업생 진로실태 조사는 전국 120개 특수학교(고등부 과정 설치 특수학교), 161개 고등부 특수학급 총281개 학교의 2001년도부터 2005년도까지 5년간 졸업생 1,334명을 조사대상으로 하였다. 이들 조사대상 1,334명은 행정공문으로 각 학교별 졸업생 명부를 통하여 추출된 것으로, 실제 5년간 특수학교(급) 고등부 졸업생의 11.1%에 해당된다. 실태조사는 1차로 우편을 통한 설문지 발송과 회수를 통해서 이루어졌고, 2차로 본원의 현장연구위원 교사 176명이 소속 지역교육청의 졸업생을 직접 방문하여 설문 및 면담 조사실시하는 방법을 통해 이루어졌다. 조사결과에 의하면, 특수학교(급) 고등부 졸업생의 35.2%가 직장을 가진 취업자이고, 64.8%가 직장을 가지지 않은 미취업자(가정거주, 시설거주, 자영업, 대학진학포함)로 조사되었다. 장애영역별 학교 졸업생의 진로 실태를 취업률 중심으로 제시하면, 시각장애학교 졸업생 36.8%, 청각장애학교 졸업생 45.4%, 지체부자유학교 졸업생 35.1%, 정신지체 및 정서장애학교 졸업생 31.7%, 특수학급 졸업생 39.5%로 나타났다. 한편, 졸업생의 연도별 추이를 취업률 중심으로 제시하면, 2001년도 졸업생 45.3%, 2002년도 졸업생 32.8%, 2003년도 졸업생 32.2%, 2004년도 졸업생 31.3%, 2005년도 졸업생 33.8%로 나타났다. 최근 5년간 특수학교(급) 고등부 졸업생의 진로실태 전반에서, 미취업자는 가족과 함께 생활하지 않은 장애성인이 많고, 학교 졸업이후 무직상태가 지속되고, 직장생활을 원하지만 특별한 지원을 받지 못하고 있으며, 전반적인 생활만족도가 낮은 것으로 나타나고 있다. 한편, 취업자의 경우, 직장생활을 하고 있는 그 자체의 만족도를 제외하고는 고용상황 전반이 열악하고, 직장의 직무수행에 다소의 어려움을 느끼고 있고, 직장의 이직률이 높지만 적절한 지원을 받고 있지 못하며, 직장의 적응 · 유지를 위한 직업훈련을 받지 못한 경우가 많고, 현 수준보다 높은 임금을 지급하는 안정된 직장에 대한 요구가 많은 것으로 나타나고 있다. 또한 직장 생활의 직무수행 효율화를 위하여 장애인식 개선 혹은 장애인편의시설 확충에 대한 요구가 많은 것으로 나타나고 있다. 이와 같은 연구의 결과를 토대로 진로 지원체제 구축을 방안을 제시하면 다음과 같다. 특수학교(급) 고등부 졸업생의 진로 지원체제 구축 방안은 진로교육 대상자의 ‘개별성’과 진로발달 단계의 ‘연속성’을 보장하고, 진로 관련 기관간의 ‘협력성’을 강조하는 진로 지원체제의 구축이 필요하다는 방향성을 설정하고, 다음과 같은 구체적인 방안이 필요하다고 보았다. 첫째, 학령기 특수교육 대상학생의 직업 · 진로교육 실시를 위한 기반을 조성하여야 한다. 특수교육 진로관련 다양한 용어들을 정비하고, 직업 · 진로 관련 법규의 수정 및 보완이 이루어져야 하며, 개별화교육계획(IEP)에 개별화전환계획(ITP)이 포함되도록 하는 법규의 재정이 필요하다. 이를 통해서 단위 특수학교(급)에서 진로교육이 시스템적으로 실천되도록 하는 토대를 마련하여야 한다. 둘째, 현행 특수교육 직업 및 진로 관련 교육과정의 현실화가 이루어져야 한다. 현행 제7차 특수학교 교육과정 기본교육과정의 ‘직업교과’ 교육실시 시기를 앞당기고, 선택중심 교육과정 ‘전문선택’의 이수 범위를 확대할 필요가 있으며, 이를 통해서 현실성 있고 실제적인 단위 학교의 직업 및 진로교육 교육과정 운영이 이루어지도록 해야 한다. 한편, 특수학급 재학생들의 직업 및 진로교육을 효율적으로 실천하기 위한 근거를 국가수준 교육과정 문서에 마련하고, 다양한 교과에 산재된 진로관련 내용을 지도할 수 있도록 교사용 지도서를 제작 · 배부하여 활용토록 해야 한다. 셋째, 특수교육 대상학생을 위한 진로교육 방법의 개선이 이루어져야 하다. 직업 · 진로교육을 위한 일관성 있는 모형을 마련하여 적용하여야 하며, 진로교육의 효율적인 실시를 위하여 평가체제 및 평가주체를 명확히 확립하고, 직업 · 진로교육의 효율적인 실시를 위하여 전문 인력을 양성하여 배치하여야 한다. 또한, 특수교육 대상학생을 위한 직업 및 진로교육은 현장친화적인 교수-학습이 이루어지도록 하는 방법상의 변화를 모색해야 하며, 현장을 중심으로 하는 다양한 진로교육 모델을 개발하여 개별학생들의 요구와 필요가 충족되도록 하여야 한다. 넷째, 특수교육 대상학생의 졸업 시 진로선택의 역량 및 지원의 강화가 이루어져야 한다. 특수교육 대상학생의 자기결정 능력을 지속적으로 향상시키고, 이를 통해서 자신의 진로를 선택하고, 선택한 진로를 유지 · 발전시킬 수 있도록 그 역량을 강화해야 한다. 또한 특수교육 대상학생의 가족이 학교의 진로교육, 지역의 진로지원을 위한 프로그램의 계획 · 실행 · 평가 전반의 과정에 효율적인 참여가 이루어지도록 지원해야 한다. 한편, 학교와 지역의 직업 · 진로관련 기관 및 인사 간을 연계하는 가칭 ‘연계 및 협력 조력자’를 양성하여 활용토록 해야 한다. 다섯째, 장애성인의 지역사회에서의 효율적인 진로 지원을 위하여 다양한 지원 프로그램이 마련되어야 한다. 특수학교(급) 고등부를 졸업한 대학진학자와 미취업자는 항시 취업대기자이기 때문에 이들을 위한 대학 당국과 평생교육기관에서의 진로 지원을 위한 다양한 프로그램을 마련하여야 한다. 또한 특수학교(급) 고등부를 졸업한 취업자를 위해서는 직업 적응 및 유지, 직업 이동을 위한 준비 프로그램, 인턴 프로그램, 사후관리 프로그램을 마련하여 지원이 이루어지도록 해야 한다. 또한 국가는 범정부 차원의 특수교육 대상학생 직업 및 진로 촉진을 위한 추진 기구를 구성하여 운영하고, 장애학생 및 장애성인의 취업활성화를 위한 정책적 지원 기구와 방안을 강구하여야 한다. 이상에서와 같이, 특수교육 대상학생의 진로교육 및 진로지원은 그들의 삶의 질 향상에 목표를 두고, 진로 대상자의 개별성과 진로발달 단계의 연속성, 관련 기관간의 연계성을 기반으로 하는 학령기, 졸업시점, 학령기 이후가 통합된 적절한 지원체제를 마련해야 한다. 이와 같은 진로 지원체제가 현실성을 가지고 효율적으로 작동하게 된다면, 대부분의 일반인이 그렇듯 장애인도 직업을 가지고, 일과 노동의 댓가로 보수를 받으며, 받은 보수로서 세금을 납부 하면서 국가와 사회에 기여하고, 가정을 유지하면서 자신의 만족감을 가지며 살아가는 데 기여하게 될 것이다. The purpose of this study was to suggest the future directions and practices for developing a comprehensive career support system in special education school, based on the analysis of the actual career status of the high school graduates with disabilities in Korea. The research was conducted in several ways. First, by reviewing the related research and the literature, the analytical frame for the actual career status was developed and the considerable factors for the development of a comprehensive career support system were identified. Second, the nation-wide survey was conducted to overview and to analyze the actual career status of the students who graduated special education high schools over the last 5 years. Third, based on the literature review and the results of the survey analysis, the future directions and best practices for the comprehensive career support system were suggested. First, the nation-wide survey was conducted in the following. The subjects were 1,334 high school graduates from both 120 nation-wide special education schools (these schools include the course of high school) and 161 special education classes among 281 general education high schools from 2001 to 2005. The subjects were identified through the school graduate lists. And they were 11.1% of the total graduates both from special education schools and special education classes over the last 5 years. The first preliminary survey was conducted by mailing the questionnaires in returning envelops. The second survey was conducted by the 176 teachers who served as research committee members of the KISE. The teachers conducted in-depth surveys and interviews by calling on the graduates who belonged to their local school districts. The survey results showed that 35.2% of the graduates were employed and 64.8% were unemployed (staying at home, living in the facilities for people with disabilities, self-employed, and attending college or universities). The survey results according to the schools classified by the disabilities indicated the following employment rate; 36.8% of the graduates from the school for the visual impairments, 45.4% of the graduates from the school for the hearing impairments, 35.1% of the graduates from the school for the physical disabilities, 31.7% of the graduates from the school for the mental retardation and emotional disorders, and 39.5% of the graduates from the special education classes. On the other hand, the employment rate were different by the year; 45.3% of the graduates in 2001, 32.8% in 2002, 32.2% in 2003, 31.3% in 2004, and 33.8% in 2005. In general, the actual career status of the high school graduates with disabilities over the last 5 years were identified for the unemployed graduates; a) many unemployed graduates did not live with their family; b) the status of unemployment went on after high school graduation; c) most unemployed graduates wanted to have occupations, but there were little support for employment, such as vocational education programs; and d) their overall level of satisfaction in life was low. Meanwhile, the employed graduates also indicated that their employment condition was poor, except the fact that they had some satisfaction for them to have jobs. The actual career status for the employed graduates were identified in the following; a) their overall employment condition was poor; b) they felt some difficulties for carrying out their jobs; c) a change of occupation rates were high without proper support, d) there were little job training for adapting a new workplace and for maintaining their current jobs; d) there were high expectations for stable jobs with better wages than their current jobs; and e) they also requested for improving the convenient facilities for the people with disabilities and for increasing the understanding and the awareness of people with disabilities for their work efficiency. Based on these findings of the high school graduates with disabilities, the future directions and practices for developing a comprehensive career support system in special education school are suggested; a) the individualities of each student with disabilities and the continuity of career development are ensured, and b) the collaboration among schools, the community resources, and the employment agencies are emphasized. Therefore, it is necessary to draw a concrete plan in the following. First, the foundation of vocational education and career services should be established firmly for the students with disabilities in school. It is necessary to compile the glossary for the vocational education, career services, and transition in special education. It is also required to amend and make laws related to vocational education and career services, and to mandate the TP(Individual Transition Plan) to be included in the IEP(Individualized Education Program). Through these laws and policies, a firm basis for the systematic vocational education should be implemented. Second, the present vocational education and career related curriculum should be actualized. The 'vocational course' of the 7th Special Education Curriculum should be taught earlier, the 'specific elective courses' from the choice-based basic curriculum should be expanded in order to implement the school-based vocational career education curriculum practically and realistically. At the same time, these suggestions should be mandated by the national curriculum. And the teacher's manual should be prepared and distributed for teachers to effectively guide students for their vocation and career preparation. Third, the vocational education teaching strategies for students with disabilities should be improved. The consistent model for the vocational and career education as well as the effective assessment system should be developed and implemented. And for the effective implementation of the vocational and career education, the professionals should be trained and be placed in school. Moreover, the model for the vocational and career education for students with disabilities should utilize the field-based teaching and learning strategies. Especially, the field-based model needs to be diverse in order to meet the individual students' needs. Fourth, it is essential to strengthen the ability and to support the career choices of students at the time of graduation. It is necessary to continually make better for their self-decision ability. Through their self-decision ability, they can make their career choices and strengthen the ability to keep and develop their chosen careers. In addition, the families of students with disability should be supported in order to participate effectively in vocational and career education in schools and the whole process of planning, implementation, and the assessment for the career support within the community. Therefore, the 'transition coordinator', who can make connections and cooperations among schools, community resources, and the employment agencies, should be trained and utilized. Fifth, a variety of supportive programs for adults with disabilities must be provided in order to ensure the effective career supports in the communities. Since the students who went to college or universities after graduating special education high schools(classes) and the unemployed high school graduates are potential employees, the university authorities and the continuing education agencies must have a variety of supportive programs for them. Besides, it is essential to have specific programs for a job adaptation and sustainment, job preparation program for a career change, various internship programs, and the follow-up programs. In addition, the government should have the special organization for promoting the employment of the students with disabilities and adults with disabilities as well. In conclusion, the purpose of the vocational and career education for the students with disabilities should be the improvement of their quality of life. Therefore, based on the individuality of each student with disabilities, the continuity of career development stages, and the inter-agency collaboration, the comprehensive career support system should be integrated throughout the schools years, at the time of graduation, and after the graduation. If the suggested comprehensive career support system are to be implemented effectively within each school and each classroom, the people with disabilities will have occupations, get paid for the work they do, pay the taxes, have families, and contribute to the community and the nation with a feeling of great satisfaction, just as the most people without disabilities do.

후방 도달 척추 절제술을 이용한 강직성 요천추 변형의 치료

석세일,정의룡,이정희,김진혁,김성수,이지호,최원기,박용원 대한척추외과학회 2004 대한척추외과학회지 Vol.11 No.2

심한 척추변형(측만증 및 후만증)에 대한 척추 후방 절제술

석세일,김진혁,이상민,정의룡,이정희,김성수,정락용 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.1S

■ Purpose To report a technique of vertebral column resection through a single posterior approach and its first results in the treatment of severe spinal deformities. ■ Methods and materials Seventy spinal deformity patients treated by posterior vertebral column resection(PVCR) were reviewed. Minimum follow up was 2 years (2 - 3.3 years). There were 34 males and 36 females with a mean age of 27.4 years at the time of the operation. Etiologic diagnoses were adult scoliosis in 7, congenital kyphoscoliosis in 38, and post-infectious kyphosis in 25. The surgery consisted of temporary stabilization of the vertebral column with segmental pedicle screw fixation, resection of the vertebral column at the apex of the deformity via the posterior route followed by gradual deformity correction and global fusion. ■ Results The total number of resected vertebrae were 143; 76 in thoracic and 67 in lumbar. Mean operation time was 4 hours 31 minutes with average blood loss of 2333 ml. The deformity correction was 40o in the coronal plane and 5Oo in the sagiotal plane. Complications were encountered in 24 patients: 2 complete cord injuries in severe adult scoliosis and thoracic kyphosis patient who had significant preoperative cord compromise, 6 hematomas, 4 root injuries (all incomplete), 5 fixation failures, 2 infections and 5 hemopneumothoraxes. ■ Conclusions PVCR is an effective alternative for severe fixed spinal deformities. However, extreme caution must be taken in the patients with preoperative cord compromise who are the high risk of neurological complications.

1,2-Benzisothiazol-3-one-1,1-Dioxide 유도체의 합성

정대일,정희철,변석인,이용균,박유미,최순규,한정태 東亞大學校附設基礎科學硏究所 2002 基礎科學硏究論文集 Vol.19 No.1

사카린 유도체는 제초제, 항독성, 살균제 등에 광범위하게 연구되어져 오고 있다. 새로운 농략 활성을 가진 물질을 합성하기 위해 먼저 선도물질로 사카린 1을 산화, 염소화 시킨 3-chloro-1,2-benzisothiazol-1,1-dioxide(BID-CI) 2와2cholromethy-1,2-benzisohizol-3-one1,1-dioxide 4를 합성하였다. 선도물질, amines, imidazoles, trones등과 반응시켜 다음과 같은 물질들을 얻었다. ; 3-cyclohexylamino-1,2-benzisothiazol-1,1-dioxide 6, 3-furylamino-1,2-benzisothiazol-1,1-dioxide 8, 3-(3-imidazol)-1,2-benzisothiazol-1,1-dioxide 10, 3-(2-methy-3-imidazol)-1,2-benzisothaizol-1,1-dioxide 12, 2-(3-imidazol)methy-1-1,2-benzisothiazol-3-one-1,1-dioxide 13, and 2-(-3-imidazol)methyl- 1,2-benzisothiazol-1,1-dioxide 14.

구조용재의 전도식과 고주파 가열식 진공건조

정희석 서울대학교 농업개발연구소 2001 농업생명과학연구 Vol.5 No.-

Red pine square timbers with 14.0㎝ and 16.5㎝ of face size, 2.4m long, were dried in a vacuum-conductive kiln and in a RF/V kiln to compare drying rate, moisture content(MC) distribution and specific energy. RF/V drying rate was higher than vacuum-conductive drying rate. The effect of face size on the RF/V drying rates were more pronounced than those of vacuum-conductive drying. Longitudinal and transverse MC distribution of dried square timber showed convex profile by vacuum-conductive drying and concave profile by RF/V drying. Moisture gradient of width direction was similar to the thickness direction in vacuum-press dried square timber and was more slight than that of the thickness direction in the FR/V dried thick square timber. Energy consumption curve increased as MC decreased. Specific energy of vacuum-conductive process required more than that of RFV process.

미치광이풀 모상근 배양에서 Tropane Alkaloid 생산성 증진을 위한 최적 생물학적 엘리시터 선발

정희영,강승미,강영민,김용덕,양재경,정영관,최명석 Plant molecular biology and biotechnology research 2003 Plant molecular biology and biotechnology research Vol.2003 No.-

Scopolamine and hyoscyamine which belong to tropane alkaloids are the pharmaceutically valuable anticholinergic drugs. In order to increase the productivities, the effects of elicitation were investigated during hairy root cultures of Scopolia parviflora. Biotic elicitors originated from 3 fungi and 1 yeast were prepared as homogenate and supernatant and added to 3-week-old cultures. Both of homogenate and supernatant of Candida albicans elicitors increased the scopolamine production. The production of hyoscyamine was enhanced by homogenate of Fusarium solani and supematant of C. albicans. Most of the other fungal elicitors were also improved on the tropane alkaloid production compared to non-treatment. Among the elicitors tested, C. albicans was proved the optimal biotic elicitor on tropane alkaloids production. These results will be served mass production of tropane alkaloids by large-scale production.

Ni_53-Fe_47 자성박막의 신형전류자기 기전력효과

정한,손희영,김미양,장현숙,이장로,이용호 全北大學校 基礎科學硏究所 1994 基礎科學 Vol.17 No.-

진공증착방법으로 제작한 Ni_53-Fe_47 박막에 관한 신형전류자기 기전력효과의 전류와 자장 방향이 만드는 각 θ 의존성이, 자기저항효과의 cos 2θ, Hall 1 효과의 경우 sin 2θ로 관측되고, 이 효과의 자장에 의존하는 전압변화율이 자기저항효과와 비교할 때 차수가 다르게 큰 것이 조사된다. 이 효과가 2 Carrier형 모델로 이해할 수 있음을 이론적으로 확인된다. A new Galvanomagnetic electromotive force effect of Ni_53-Fe_47 thin films is studied. The dependence of this effect on θ, angle between the current and the magnetic field, is found to be the form of sin 2θ, in contrast with that of the magnetoresistance effect cos 2θ and that of the Hall effect sin θ. Property of this effect is that the rate of the voltage variation depending on the magnetic field is extremely large as compared with the magnetiresistance effect. It is theoretically confirmed that this effect is well understood on the basis of the two carrier types model.

전통악기 음향판용재의 음향성 및 흡습성 개량

정희석 서울대학교 농업개발연구소 1999 농업생명과학연구 Vol.3 No.-

This research was carried out to compare structure, equilibrium moisture content(EMC), adsorption and acoustical properties between 4 retention levels of saligenin(o-hydroxybenzyl alcohol) treated, heat-treated and untreated chestnut(Castanea crenata S. st Z.) and paulownia(Paulownia spp.) woods. The cell structures of untreated wood and heat-treated wood were not different but the cell wall of saligenin treated wood was thicker than that of untreated wood for both species. EMC of untreated wood was the highest, next was that of heat-treated wood, and that of saligenin treated wood was the lowest, and among saligenin treated woods, EMC was decreased as retention level increased for both species. Adsorption curves were parabolically increased. Acoustical properties of saligenin treated wood were most improved, and the next were those of heat-treated wood. Comprehensive acoustical property was improved at retention level 20% and 30% for chestnut wood, and at retention level 80% for paulownia wood.

솔-젤법에 의한 Nb_2O_5-Fe_2O_3 혼합산화물의 제조 및 산 특성조사

정석조,양희정,권재범,이내우,우희철 釜慶大學校 2000 釜慶大學校 論文集 Vol.5 No.-

In this study, some of results from a study conducted on the preparation of niobium coated hematite particles to be used as a catalyst are presented.α-Fe_2O_3 (hematite) particles obtained by aging an acidic solution of ferric(Ⅲ) ions at high temperature were first prepared as core particles and synthesised by hydrolysis at high temperature with layers of amorphous niobium pentaoxide (Nb_2O_5) deposited by the hydrolysis of niobium pentachloride. The effects of varying molecular ratio of Nb/Fe (10/1, 5/1, 1/2, 1/5, 1/10) were studied. The synthesised particles were characterized for their physical and chemical properties using XRD, SEM, TPD, BET etc. The process of the surface coating showed heterocoagulation rather than surface nucleation and growth. A preliminary investigation of the acidic characterization and specific surface area of the synthesised particles showed that these particles can achieve an acidic characteristic changed and enhanced specific surface area of that of pure niobia and α-Fe_2O_3 prepared here.