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.

침엽수 구조용 정각재의 천연건조곡선과 함수율분포

정희석,이철현,강욱,엄창득 한국목재공학회 2003 목재공학 Vol.31 No.1

이 논문은 소나무와 일본잎갈나무의 변장 14.0cm와 16.5cm인 큰 정각재의 천연건조과정과 함수율분포에 관한 내용으로서 건조속도는 건조개시 첫 8주 동안 비교적 컸었으나 그 이후부터 점차 감소하였다. 생재에서 규격함수율 18% 수준까지 건조시간은 소나무 14.0cm와 16.5cm가 각각 26주와 32주이고, 일본잎갈나무의 경우는 각각 32주와 48주이었다. 이들 정각재의 재장방향과 두께방향의 수분경사는 비교적 완만하였다. 일본잎갈나무의 수분경사는 소나무의 것보다 컸었고, 일본잎갈나무의 변장의 크기가 수분경사에 미치는 영향은 소나무의 것보다 컸었다. This paper presents the results of air-drying processes and mositure content (MC) distribution of red pine (P. densiflora) and Japanese larch (I. leptolepis) square timber with 14 cm and 16.5 cm of face size, respectively. The air-drying rates of square timber were comparatively high during the first 8 weeks, after that gradually decreased. The time to air dry square timber from initial MC to specified MC of 18 percent required about 26 weeks for 14.0 cm and 32 weeks for 16.5 cm square of red pine, and 32 weeks for 14.0 cm and 48 weeks for 16.5 cm square of Japanese larch. The longitudinal-and transverse MC distribution of these air-dried squares showed slight moisture gradient. The effect of face size on moisture gradient of Japanese larch square was more pronounced comparing with red pine one.

큰 정각재의 가열판과 고주파 진공건조간 건조특성의 비교

정희석,강욱,이철현 한국목재공학회 2002 목재공학 Vol.30 No.2

변장 14.0 ㎝와 16.5 ㎝인 소나무 정각재의 가열판진공건조와 고주파진공건조간의 건조속도, 함수율분포와 比에너지를 비교하였다. 고주파진공건조는 가열판진공건조보다 건조속도 및 변장이 건조속도에 미치는 영향이 컸었다. 가열판진공건조 목재의 재장방향, 두께방향과 폭방향의 함수율분포는 볼록 형태를 나타내었고, 고주파진공건조 목재는 오목 형태를 나타내었다. 가열판진공건조 목재의 폭방향과 두께방향간의 수분경사는 유사하였으나 고주파진공건조 목재의 경우는 폭방향의 수분경사가 두께방향보다 완만하였다. 가열판진공건조와 고주파진공건조의 比에너지곡선은 함수율이 감소할수록 증가하는 경향을 나타내었고, 가열판진공건조의 比에너지는고주파진공건조보다 컸었다. Red pine(Pinus densiflora) square timbers with 14.0 ㎝ and 16.5 ㎝ of face size and 2.4 m long were dried in a vacuum-press kiln and in a radio-frequency/vacuum(RF/V) kiln to compare drying rate, moisture content(MC) distribution and specific energy. RF/V drying rate was higher than vacuum-press drying rate. The effect of size of cross section on the RF/V drying rates were more pronounced than those of vacuum-press drying. The longitudinal- and the transverse MC distribution of dried square timber showed convex profile for the vacuum-press drying and concave profile for the 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 RF/V dried large square timber. The specific energy consumption curve increased as MC decreased. Specific energy(kWh/㎏ of water evaporated) of the vacuum-press process required more than that of the RF/V process.

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.

JNDI를 이용한 Mobile Agent 기반 망관리시스템

김정철,김강석,송왕철 제주대학교 산업기술연구소 1999 尖端技術硏究所論文集 Vol.10 No.2

Recently, network management technology by delegation has been studied as a kind of network management technology to satisfy the user's requirements. Mobile Agent in the technology issues in the distributed network system. Mobile Agent is a software program which is able to move on network with mission for managing a NE(Network Element). Therefore, We have studied the efficient network management technology which is the network management system based upon Mobile Agent Using JNDI(Java Naming Directory Interface). JNDI is API(Application Program Interface) to support interface which make user's application program to be used the naming & directory service. We have designed and implemented the mobile agent network management system using JNDI. This Mobile Agent system is expected to provide a solution for the conventional centralized network system.

벼 담수직파 재배시 생장조절제 처리가 생육 및 도복에 미치는 영향

金正鎬,吳成煥,李哲遠,宋凡憲,孫錫龍 忠北大學校 農業科學硏究所 2002 農業科學硏究 Vol.19 No.-

본 시험은 벼 도복을 경감시키기 위한 재배대책을 강구하기 위하여 추청벼를 공시하고, 담수직파재배에서 생장조절제를 처리함에 따른 도복경감효과를 조사하였던 바 그 결과를 요약하면 다음과 같다. 1 간장은 무처리구보다 IBP+Inabenfide구가 186cm 단축되어 가장 큰 감소효과를 보였다 2 하위절간장 역시 무처리구보다 IBP+Inabenfide구가 3-4절간 35cm, 4-5절간은29cm 단축되어 가장 큰 감소효과를 보였다 3 포장도복은 무처리 5에 비해 IBP+Inabenfide구는 0으로 도복이 발생하지 않았으며, 수량은 무처리에 비해 도복이 발생하지 않았던 IBP+Inabenfide구가 5% 증수되었다 This study was conducted to investigate the effects of plant growth regulators, 2,4~D, IBP, and Inabenfide, on growth responses and lodging resistance of rice in cultivation of the waterlogging direct seeding The Chuocheong cultivar of Japonica type was used Growth responses itcluding culm leagth and lodging index etc and rice yields were measured at major growth stages and harvest time Culm length was the shortest in the treatment of IBP + Inabenfide, shortening it to 186 cm compared to that of the control, showing the best application effect of the plant growth regulator The length of internode between third and fourth internodes of lower culm was shortened to 3.5 cm with treatment of IBP + Inabenfide compared to that of the control and it between fourth and fifth internodes was shortened to 29 cm with treatment of Inabenfide, showing the best effectiveness. Lodging was not appeared in treatment of IBP + Inabenfide compared to 5.0 of the control Resulting to reduciag the lodging, rice yield was increased more with treatment of IBP + Inabenfide, to about 50%, than that of the control

수영운동 참여가 주부의 여가 및 생활만족에 미치는 영향

김규철,김정주,이석주 경희대학교 체육과학연구소 1997 體育學論文集 Vol.25 No.-

This study has analyzed having 315 housewives in Seoul as the subject and got the conclusion like following, in order to examine positively the influence the participation in a swimming has on housewife's, satisfaction in leisure and life by investigating if there is any significant difference between the housewives' satisfaction in leisure and life who paricipate and don't participate in a swimming exercise. First, As result of a Chi-square analysis, the general characteristics showed a significant difference in the satisfaction in leisure, the experience of immersion and the satisfaction in life according to the yes or no of the participation in as swimming. Second, As a result of verifying the difference in the extent of satisfaction between the domains. a group of participants in a swimming showed more significant difference than a group of those who didn't participate in the satisfaction in leisure. the experience of immersion and the satisfaction in life. Third, It appeared that there were mutual relation and a significant difference between each other in the satisfaction in leisure, the experience of immersion and the satisfaction in life. Fourth. As result of Stepwise Multiple Regression, Only the mental, resting and environmental satisfaction have a strn persuasive power, and the other changing factor has no persuasive bower.

벼 재배방법과 규산질 비료 시용이 생육 및 도복에 미치는 영향

金正鎬,吳成煥,李哲遠,宋凡憲,孫錫龍 忠北大學校 農業科學硏究所 2002 農業科學硏究 Vol.19 No.-

본 시험은 벼 도목을 경감시키기 위한 재배대책을 강구하기 위하여 광안벼를 공시하고, 이앙재배와 담수직파재배에서 규산질 비료를 시용함에 따른 도복경감효과를 조사하였던 바 그 결과를 요약하면 다음과 같다 1 간장은 담순표면직파재배에선 규산시용구가 무처리보다 31cm 감소하여 37%가 단축되었으며, 기계이앙재배에서는 규산시용구가 무처리보다 5cm 감소하여 55% 단축되었다 2 하위절간장은 담수표면직파재배에서 규산시용구가 무처리보다 3.1cm 감소하여 36 9% 단축되었으며, 기계이앙재배에서는 규산시용구가 무처리보다12cm 감소하여 11% 단축되었다 3 좌절중은 담수표면직파에서 규산시용구가 73g이 증가하여 35 2%의 증가율을 보였고, 기계이앙재배에서는 규산시용구가 373g 증가하여 9.6%의 증가율을 보였다 4 수량은 담수표면직파재배에서 규산시용구가 무처리보다 30kg이 많아 64%의 증수효과를 나타내었고, 기계이앙재배에서는 규산시용구가 무처리보다50kg이 많아 9%의 증수효과를 나타내었다 This study was carried out to examine the responses of growth and lodging of rice as affected by both transplanting and direct seeding in waterlogging, which was differently applicated amounts of silicate fertlizers The Kwangan cultivar of Japonica type was used The growths including culm and internode lengths and grain yield were investigated in major growth stages and harvest time The culm length in waterlogging direct seeding was reduced in treatments of silicate fertilizers, about 37%, compared to that in the contro1 and it was reduced to 5.5% in the transplanting cultivation The breaking strength of lower internodes of rice were increased to 35.2% and 96% by applying of silicate fertilizers in the water direct seeding and in the transplanting cultivations, respectively The rice yields were increased with application of silicate fertilizers in both water direct seeding and transplanting cultivations compared to those of the control, about 64% and 90%, respectively.

空氣中 正極性 Spark Channel의 磁氣場에 의한 影響

吳喆漢,尹文洙,姜禎錫 慶北大學校 産業開發硏究所 1978 硏究報告 Vol.6 No.-

The influences of magnetic field on the positive spark channel of point-to-rod gap under steady potentials in air were studied by means of two cameras and an oscilloscope. The direction of magnetic field was perpendicular to the gap axis, and the magnetic field strength ranging from 0 to 6.6kG was applied. The positive spark channel was deflected in the direction of the Lorentz force. Therefore, it was confirmed that the positive streamer model, which says the streamer is progressing with positive space charge on its tip, is reasonable. The first step length of the spark channel was increased as the magnetic field strength was increased, but it was abruptly decreased at about 4kG. Then, it showed constant above 5kG. However, it first step deflection length was increased at about 3kG. But it was decreased from 3kG to 4kG. It was unchanged above 5kG.

중증 재생불량성 빈혈 환자에서 신우신염에 대한 광범위항생제치료 중에 속발한 Saccharomyces cerevisiae 진균감염 1예

김철희,이정호,이정찬,강정현,곽상혁,배광봉,김현수,김종숙,조덕연,김삼용 충남대학교 의과대학 지역사회의학연구소 1999 충남의대잡지 Vol.26 No.1

Most patients with aplastic anemia who do not respond to immunosuppressive treatment or are not candidates for bone marrow transplantation die of infection or bleeding. The neutropenia in acute leukemia, aplastic anemia, or occurring subsequently to chemotherapy and bone marrow transplantation increases susceptibility to infection. In general, the number of infectious episodes correlate with the degree and duration of neutropenia. Global immunosuppression produced by conditioning for bone marrow transplantation or graft-versus-host disease, is associated with unusual bacterial and fungal pathogens, or serious viral and protozoan infections. In addition, repeated treatment with broad-spectrum antibiotics is associated with the emergence of resistant organisms and fungal diseases because of the altered microbial microenvironment of the host. The incidence of invasive fungal infection caused by Saccharomycetes eerevisiae in immunosuppressed patients is very rare, compared with that of infection by candida or aspcrgillus species. Cases of Saccharomycetes cerevisiae fungemia occurring in the course of treatment with broad-spectrum antibiotics are reported in patients with extensive burn or with prosthetic valve endocarditis. We experienced a case of urinary tract infection by Saccharomycetes cerevisiae in a 27-year old female patient with severe aplastic anemia. We report the case with a review of relevant literatures.