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.

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.

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.

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.

벼 재배양식에 따른 규산질 비료 추비 사용 효과

金正鎬,吳成煥,李哲遠,宋凡憲,孫錫龍 한국국제농업개발학회 2002 韓國國際農業開發學會誌 Vol.14 No.1

본 시험은 벼 도복을 경감시키기 위한 재배대책을 강구하기 위하여 광안벼를 공시하고, 이앙재배와 담수직파재배에서 규산질 비료를 사용함에 따른 도복경감효과를 조사하였던 바 그 결과를 요약하면 다음과 같다. 1. 간장은 담수표면직파재배에서 규산시용구가 무처리보다 3.1cm 감소하여 3.7%가 단축되었으며, 기계이앙재배에서는 규산시용구가 무처리보다 5cm 감소하여 5.5% 단축되었다. 2. 하위절간장은 담수표면직파재배에서 규산시용구가 무처리보다 3.1cm 감소하여 36.9% 단축되었으며, 기계이앙재배에서는 규산시용구가 무처리보다 1.2cm 감소하여 11% 단축되었다. 3. 좌절중은 담수표면직파에서 규산시용구가 73g이 증가하여 35.2%의 증가율을 보였고, 기계이앙재배에서는 규산시용구가 37.3g 증가하여 9.6%의 증가율을 보였다. 4. 수량은 담수표면직파재배에서 규산시용구가 무처리보다 30kg이 많아 6.4%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 two cropping practices, transplanting and direct seeding in waterlogging, and different application amounts of silicate fertilizers. 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 3.7%, compared to that in the control 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 9.6% 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 transplantingcultivations compared to those of the control, about 6.4% and 9.0%, respectively.

Urea를 이용한 Diesel 자동차 배기가스의 de-NOx 촉매 활성에 관한 연구

온중수,이성철,정석진 慶熙大學校 材料科學技術硏究所 2000 材料科學技術硏究論集 Vol.13 No.-

디젤 자동차의 배출규제를 만족시키기 위해 우리나라를 비롯한 세계의 여러 나라에서 활발히 연구되고 있으며, 본 실험에서는 현재 고정원 SCR 공정의 상업용 de-NOx 촉매로 일반적으로 사용되고 있는 V_(2)O_(5)/TiO_(2) 촉매를 가지고 초희박 연소조건인 Diesel 자동차의 질소산화물 제거용 촉매로의 가능성을 타진하기 위해 여러 공정변수에 따른 실험을 실시하였다 NH_(3)보다 안전하고 취급이 용이한 urea를 환원제로 하여 실험을 실시한 결과 1 mole의 urea가 2 mole의 NH_(3)로 분해된다고 판단되는 350℃이상의 분해온도에서 urea가 주입되었을 때 60%이상의 de-NOx activity를 보였다. 결론적으로, urea를 환원제로 하는 복합촉매 system은 Diesel 자동차의 de-NOx 촉매로써 상당한 적용 가능성을 가진다 하겠다.

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

2-프로핀일 고리 카보네이트의 Pd(0) 촉매를 이용한 가수소분해반응연구 : (Z)-호모알릴알콜과 2-호모프로핀일 알코올의 합성 Catalyzed Hydrogenolysis of Prop-2-ynylic Cyclic Carbonates

강석구,박동철,정재욱,정경윤 성균관대학교 기초과학연구소 1994 論文集 Vol.45 No.1

삼중 결합을 갖고 있는 2-프로핀일 고리카보네이틀 Pd(acac)_2와 nBu_3P을 촉매로 하여 포름산 암모늄염을 사용한 탈카르복실화-가수소분해반응을 이용해서 (Z)-호모알릴 알콜과 2-호모프로핀일 알콜을 반응조건에 따라 각각 합성하였다. 그리고 분자끝 2-프로핀일 고리카보네이트의 가수소분해반응을 이용하여 호모알릴 알콜을 합성하였다. (2S. 4Z)-1-(p-메톡시벤질옥시)-2-히드록시-4-헵틴 2b를 광학활성 중간체로 사용하여 pyralid 나방 Aphomia gularis의 male 성페르몬을 합성하였다. The decarboxylation-hydrogenolysis of prof-2-ynylic cyclic carbonates which have an internal acetylenic bond with ammonium formate in the presence of a catalytic amount of [Pd (acac)_2] and nBu_3P afforded(Z)-homoallylic alcohols or homoprop-2-ynylic alcohols dependin on the reaction conditions. however, hydrogenolysis of terminal prop-2-ynylic cyclic carbonates gave homoallylic aicohols; using (2S, 4Z)-1-(p-Methoxybenzyloxy)-2-hydroxy-4-heptyne 2b as a chiral synthon, the male sex pheronome of the pyralid moth Aphomia gularis has been synthesized.

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.

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.