LaCoO₃ 혼합산화물 촉매를 지지할 담체의 개발에 관한 연구

고성운,김철현 安東大學校 工業技術硏究所 1994 공업기술연구논문집 Vol.1 No.1

We could support LaCoO₃-type mixed oxide catalysts on MgO. In these cases, the activities were somewhat constant rigardless of the degree of A-site vacancy. All the supported and unsupported catalysts were poisoned by SO₂, but the durability of the supported catalysts were far better because of their high surface areas. Pt or Pd did not improved the catalytic activities or the resistance against SO₂ poisoning.

자기자극을 이용한 요천추신경총 전도검사

김철,고영민 大韓再活醫學會 1998 Annals of Rehabilitation Medicine Vol.22 No.3

송전선로의 고장검출용 마더 웨이브렛 선정과 기본과 추출에 관한 연구

고영훈,이병길,김철환 成均館大學校 科學技術硏究所 1999 論文集 Vol.50 No.2

Due to the challenges facing many utilities worldwide as a result of deregulation, the demand and importance of accurate fault detection and fault location in transmission systems has increased, principally to minimise line outages through effecting repairs expeditiously. This paper presents a novel approach in fault detection for high impedance faults(HIFs) and low impedance faults (LIFs) based on the concept of wavelet transform. It is shown that the fault detection algorithm is highly insensitive to capacitive switching, line switching and arc furnace loads in a 154kV korean model system as generated by EMTP. Also. this paper presents a new approach in extraction of fundamental frequency components using wavelet analysis.

수용성 미셀용액에 가용화된 Acetanilide, p-diacetylbenzene 및 tetrabromo-p-quinone의 미세환경의 성질

高正秀,金信局,朴哲浩 木浦大學校 基礎科學硏究所 1994 基礎科學硏究誌 Vol.12 No.-

Solubilization of some carbonyl compounds such as acetanilide, p-diacetylbenzene and tetrabromo-p-quinone was investigated in a variety of aqueous micellar solutions by UV spectrophotometric method. The good linear relationship was obsorved between υ(n→π*)of these carbonyl compounds and solvent polarity parameter, ??, of some pure solvents. Themicroenvironmental polarity of these carbonyl compounds depended on the ionic properties of the surfactants, and decreased as cationic > anionic > nonionic.

H₂ 및 CO에 의한 LaCoO₃ 촉매의 환원

고성운,김철현 安東大學校 工業技術硏究所 1996 공업기술연구논문집 Vol.3 No.1

With the perovskite-type oxide catalyst, LaCoO_(3), a study was performed on the reduction properties of catalyst by H_(2) and CO with TGA, XRD and FT-IR. The reduction of LaCoO_(3) in H_(2) atmosphere was a quantitative process with two steps. In the first reduction step at 320∼480℃, LaCoCO_(3) was reduced to LaCo_(1-X)O_(2.5) and xCo. These were further reduced to the final products, La_(2)O_(3) and metallic Co, through the second step at 600∼670℃. The LaCoO_(3) catalyst was reduced in CO atmoshpere via three-step process, La_(2)O_(3) and carbonate of cobalt was formed as the final products at 850℃. In the first and second step, LaCoO_(3) was changed to LaCoO_(2.5) and LaCoO_(3), respectively. These oxygen-deficient intermediates formed carbonates by CO adsorption.

LaCoO₃계 페롭스카이트 촉매에서의 NO 환원반응

고성운,김철현 安東大學 1996 安東大學 論文集 Vol.18 No.1

With the perovskite-type oxide catalysts such as LaCoO_(3), Ce-, Th-, Sr- or Ba-substituted LaCoO_(3) and A-site vacant LaCoO_(3), a study was performed on the catalytic activities and the properties of active sites for NO reduction, which is the principal reaction of automobile exhaust control. The active sites were oxygen vacancies for NO reduction. LaCoO_(3) showed highest activities for NO reduction. Calcination of the catalysts at higher temperature created more vacancies in lattice oxygen with improving the activities for NO reduction. Sr- and Ba-substituted LaCoO_(3) catalysts, which are known to be reduced more easily and expected to be more active in NO reduction, showed lower activities for NO reduction than LaCoO_(3) or Ce-substituted LaCoO_(3). It seems that a catalyst, in oder to show high activity for NO reduction, must have appropriate oxygen vacancies.

노말브틸아크릴레이트/메틸메타아크릴레이트계 유화중합에 관한 계면활성제의 영향

고기영,김철웅,김광주,구기갑 한국공업화학회 2002 응용화학 Vol.6 No.2

Polymer latexes for polymer cement were prepared by introducing small amount offunctional monomers(acrylic acid and acrylic amide) during the semicontinuousemulsion polymerization of methylmetacrylate(MMA) and n-butyl acrylate(n-BA). Thepolymerization was investigated by following the variation of the amount and type, of surfactants on particle size, polymer content at different times of the polymerization process. The results showed that both particle size and polymer content can be controlled by the amout and types of surfactants. LE and NE types out of nonionic surfactants used were good surfactants due to the formation of stable polymer latex without coagulants. Especially, a hydrophilic chain length(n) of these nonionic surgactants had a signigicant effect on the final particle size and polymer content.

제주대학교와 창원대학교의 지체장애인 편의시설 비교분석

고상선,박철민,김태일 제주대학교 공과대학 첨단기술연구소 2002 尖端技術硏究所論文集 Vol.13 No.2

Colleges and Universities are one of our whole life educational facilities for the disabled regarding job training opportunities are academic goal achievement. However it is usual for the disabled students to be deprived of their opportunities to study and to prepare their future life on campus because of physical obstacles of campus environment. Therefore this study provides what are the physical obstacles on campus, how to use the college's facilities for the disabled to achieve their academic goals and to have job training opportunities just like ordinary students, and how to improve the campus environment which is based on the concept of Universal Design.

초등학생의 1000m 달리기-걷기 평가방법에 관한 연구

박철호,박은경,고봉민,우상헌,안민호,차유림 東亞大學校附設스포츠科學硏究所 2002 스포츠科學硏究論文集 Vol.20 No.-

This research aims to develop a new evuluation method of endurance for elementary school students. The norm of the event of 1,000m running-walking was examined and reviewed. As a result, a new highly-valid norm for the present 1,000m running-walking was made. Among the 5th and 6th graders, 2,144 pupils were chosen. The subjects were given 1,000m running-walking and step test. The new norm led to the following results: 1. The frequency distribution of PEI according to Cajori's 5-stage evaluation method turned out to be normal for both 5th and 6th graders. In conclusion, this new norm of 1,000m running-walking is believed to provide more valid and credible scores for elementary school students. The 1,000m running-walking records and the PEI will be used as the basic data for foretelling one's endurance.

한국사회에서의 도서와 육지간의 접합에 관한 연구 : 제주도의 경우 A Case of Cheju Island

유철인,고남욱,고창훈 제주대학교 1986 논문집 Vol.16 No.1

Recent introduction of citrus cultivation causes the growth of Cheju regional economy with the inflow of external captial under the influnce of external market. These processes result in the Cheju regional economy dependent upon the national economy. Since the advent of large-scale tourism often necessitates the transfer of local control to a central government, Cheju society as a touristic place is more dependent on national society with the national development projects on Cheju island. These tourism and citrus cultivation cause rapid urbanization, more access to education, more exposure to mass communication, and the increase in the mobility of both of Cheju islander and mainlander, As a result, Cheju culture becomes more assimilated into mainland or national culture. We call these recent phenomana the social articulation between Cheju island and mainland as a larger society. The term articulation is the congruence or working together of differrent strata or different levels such as the articulation of modes of producction. Paticularly, as used in this paper, it describes the process by which the local island society becomas in corporated more fully into the larger society. This paper examines (1) the phenomena social articulation between Cheju island and mainland in terms of regional economy and policies, (2) the response of community to this articulation, and (3) its impacts on the development of Cheju island and the prospects of desirable relationship between local island society and the center. First of all, Cheju industry structure consists of 34.9% in the primary, .3% in the secondary, and 60.8% in the itertiary industry,in terms of vaules added as of 1981, while in 1971 the primary industry dominant. Employments by industry In Cheju region as of 1981 consist of 71.7% in the primary, 3.2% in the secondary, and 25.1% in the tertiary industry. Cheju regional economy is articulated with national economy because of citrus cultivation and products of fishery under influendces of domestic and foreign markets as well as a tourism industry as a leading industry for regional development. People in Cheju island feel the state of alination with these overwhelming changes, which is followed by outsider's speculation on land, the leakage of benefits resulted from outside capital investment, and the evnvironmental pollution. These phenomena may be discovered in the transformation from the closed socioeconomic system to the open socioeconomic system. Seocond, the articulating process of structual dependency of political, economic, and social fields is reavealed concretely in the process of formulation, making, and implementation of polities. The philosopical foundation of policy is not the philosophy of Small-is-beautiful, but the philosophy of Big-is-good. And the goal of policy is sought out without conscideration of the basic problems such as openess and closedness, national-oriented and international-oriented development and conservation, and active participation and passive alination of islanders. We learn that the formulation, content, and implemantation by national elites affected by not the volition of residents in Cheju-Do, but the vested interest of large firms and international capital investment. Its effects are expressed in terms of the alination, the powerlessness, and the suffering of Cheju islanders. Third, under the vast process of acculturation, these overwhelming waves of change do stimulate the Cheju society as a so-called periphery in acquiring a consciousness of the degree of exploitation it is subjected to. As an adaptive action, Cheju cultural identity is maintained and/or invented with the emphasis on its own traditional spirits, which may be considered as the revitalization movements in Cheju culture. Ambivalance toward mainland as an outer world is expressed in everyday life in Cheju society. Ambivalance toward an outer world is thought to be discovered in any society articulated with and dependent upon the lager society. Cheju islanders also miss tat Cheju culture becomes more assimilated into mainland or national culture. We consider the social articulation of Cheju island and mainland amid historical context of the contacts with mainland as sociocultural forces which operate to create Cheju cultural identity. The aura of Cheju cultural identity and traditionalism is one of the devices which insures the continuance of boundaries between Cheju islander and non-islander (mainlander) within a tourism and the migration of mainlanders, Cheju islanders' perception of what mainlanders think about Cheju islanders operates to create the meaning and content of their cultural identity is maintained may consist of the contacts with mainlandsers and the formation of an image on them. We concluded that the articulation must be transformed from total dependency into the equity through the structual autonomy, changes in policies, and cultural autonomy This means the balance of everyday ilife in an island and a mainland, and further, in the center and peripheries. Alternatives for this desirable articulation are as follows. First of all, the decentralized and autonomous political-administrative structure, the active and intensive regional economy, and social cultural development focused on community must become to be interrelated in order to be an intergrated development from within. Secondly, the development policies must be fundamentally changed in terms of basic philosophy, content, and implempentation. Lastly, the cultural diversity is to be fully appreciated, based on the understanding of local cultures or subcultures.