농업회계관리의 전산시스템 구축에 관한 연구

이동호,양병우,이승형 韓國農業政策學會 1996 농업경영정책연구 Vol.23 No.2

반도체 폐 Si 슬러지를 이용한 질화규소세라믹의 제조

이병택,유정호,김해두 공주대학교 자원재활용신소재지역협력센터 2000 2차년도 센터 사업 성과집 Vol.2000 No.1

반도체 폐 Si 슬러지를 이용하여 질화반응 및 post-sintering을 통해 제조된 질화규소세라믹의 미세조직 및 기계적 특성을 광학현미경, SEM 및 XRD를 이용하여 연구하였다. 상당량의 SiO2비정질상을 포함하는 폐 Si분말에서 많은 microcracks이 관찰되었다. 폐 슬러지를 사용한 Si 성형체의 질화율은 상용되고 있는 Si분말을 이용한 성형체의 값에 비해 낮은 값을 보였다. 그러나 질화온도가 증가함에 따라 질화율은 증가하였으며 1470℃에서 질화율은 98%를 보였다. 반응소결체내에 존재하는 Si3N4의 결정은 α와 β상으로 혼재되어 있으며 상당량의 산질화규소상이 검출되었다. 1950℃에서 후처리된 시료의 최대파괴인성 및 파괴강도 값은 각각 5.6 MPa · m1/2과 497 MPa로 H. C. Starck사의 Si을 이용한 것에 비해 낮은 값을 보였으며 이는 산질화규소 형성에 기인된 것으로 사료된다 The microstructures and mechanical properties of Si3N4 ceramics produced by nitridation and post-sintering using semiconductor-waste-Si sludge were investigated. Lots of microcracks were observed in the waste-Si powders which contained some amounts of amorphous SiO2. The nitridation rate of waste-Si compacts showed lower value than that of commercial Si powder compacts. The nitridation rate was increased with increasing nitridation temperature and then the percent of nitridation at 1470℃ showed 98%. The phases of Si3N4 in the reaction-bonded bodies were mixed with α and β-type, and small amounts of Si2N2O phase while those after post-sintering were β-Si3N4 and O'-Sialon. The sample post-sintered at 1950℃ showed the fracture toughness of 5.6 MPa · m1/2 and the fracture strength of 497 MPa which were lower than those of sintered body using commercial Si powder possibly due to the formation of O'-Sialon phase.

Al系 軸受合金에 對하여

李重鎬,李炳直 釜山工業大學校 1969 論文集 Vol.8 No.-

腦轉移巢에서 組織診으로 確定된 Friedman 反應 陰性을 呈한 絨毛上皮腫의 一例

李豹鎭,李台鎬,李東植,張炳國 경북대학교 의학연구소 1964 慶北醫大誌 Vol.5 No.1

Mctastatic brain tumor in a case of choriocarcinoma with negative Friedman reaction has been experienced. There have been a few reports on such negative Friedman reaction in cases of choriocarcinoma. A review from some literatures concerning the matastatic choriocarcinoma in relation to Friedman reaction is discussed.

고능률 소형 전자석에 의한 자왜 및 자기이방성 측정

이용호,신용돌,김병걸,민복기,송재성 全北大學校 基礎科學硏究所 1994 基礎科學 Vol.17 No.-

자왜 또는 자기이방성의 측정에 사용되는 전사석의 여자전류를 측정에 필요한 수초간만 흘려서 에너지 소모 및 측정시의 최대난점인 시료의 온도변화의 문제를 극소화하였다. 따라서 전자석의 냉각장치는 생략되고 크기와 전원의 용량도 극소화되었다. 공기간격 22㎜, 자극의 단면적 40 × 25㎟에서 0.5 T의 자장발생에는 180 W의 전원으로 족하였다. 시료의 자왜와, 자기이방성에 의한 토크를 전기용량센서에 의하여 측정하여 10^-8의 자왜분해능과 1 nJ의 토크 분해능을 얻었다. 0.02× 0.8× 10㎟의 연자성 리본의 형상이방성을 이용하여 이방성 측정시의 토크값을 교정하였다. A high efficiency small electromagnet(22㎜ air gap and 40 × 25㎟ core's cross section) suitable for measuring magnetostriction and magnetic anisotropy was built. The magnet could be miniaturized by reducing the measuring space and time. The excitation current of the electromagnet was supplied for only a few second of small. An 0.5 T magnetic field was generated with 180 W power consumption. The values of magnetostriction and magnetic anisotropy were measured with a very sensitive capacitance cell with resolution of 10^-8 and 1 no. The torque was calibrated using a soft magnetic ribbon's shape anisotropy.

반도체 폐 Si 슬러지를 이용한 질화규소세라믹의 제조

이병택,김해두,유정호 공주대학교 자원재활용 신소재 연구센터 1999 1차년도 센터 성과집 Vol.1999 No.-

반도체 폐 Si슬러지를 이용하여 질화반응 및 post-sintering을 통해 제조된 질화규소세라믹의 미세조직 및 기계적 특성을 광학현미경, SEM 및 XRD를 이용하여 연구하였다. 상당량의 SiO₂비정질상을 포함하는 폐 Si분말에서 많은 microcracka이 관찰되었다. 폐 슬러지를 사용한 Si 성형체의 질화율은 상용되고 있는 Si분말을 이용한 성형체의 값에 비해 낮은 값을 보였다. 그러나 질화온도가 증가함에 따라 질화율은 증가하였으며 1470℃에서 질화율은 98%를 보였다. 반응소결체내에 존재하는 Si₁N₄의 결정은 α와 β상으로 혼재되어 있으며 상당량의 산질화규소상이 검출되었다. 1950℃에서 후처리된 시료의 최대파괴인성 및 파괴강도 값은 각각 5.6 MPa로 MPa로 H. C. Starcktk사의 Si을 이용한것에 비해 낮은 값을 보였으며 이는 산질화규소 형성에 기인된 것으로 사료된다. The microstructures and mechanical properties of Si₁N₄ceramics produced by nitridation and post-sintering using semiconductor-waster-SI sludge were investigated. Lots of microcracks were observed in the waste-Si powders which contained some amounts of amounts of amorphous SiO₂. The nitridation rate of waste-Si compacts showed lower value than that of commercial Si powder compacts. The nitridation rate was increased with increasing nitridation tempera ture and then the percent of nitridation at 1470℃ showed 98%. The phases of Si₁N₄in the reaction-bonded bodies were mixed wit αand β-type, and small amounts of Si₂N₂phase while those after post-sintering were β-Si₁N₄and α-Sialon. The sample post-sintered at 1950℃ showed the fracture toughness of 5.6 MPaㆍm1/2 and the fracture strength of 497 MPa which were lower than those of sintered body using commercial Si powder possibly dur to the for-mation of α-Sialon phase.

충남 옥천군 군서지역에 있어서의 환경위생적 조사연구

이병국,맹광호,이광묵 최신의학사 1975 最新醫學 Vol.18 No.2

An Environmental and santiary survey was carried out on 585 houses and 36 wells in Gunseo Area, Okcheon-Gun, Choongbook Province. As a survey on sanitary environments of houses, number of rooms they were using, artificial lightening method, house heating method and sanitary measures in the kitchen were checked. Sanitary environments of drinking water sources were also investigated. Other tested items with water samples were hardness, pH, and chloride ion, and the results were summarized as follows: 1. 38.1 % of all subjected households were using 2 rooms and 29.4%, 3 rooms. 97.0% of all households were lightening their houses with oil lantern and those who were using elec tric lights were 1.7%. Those who were using coal briquett for their house heating were 12 households (2.0%). 7.4% of all households did not have any cupboard in their kitchens and those who were using dry wiping cloth were only 30.3% among all subjected housholds. 2. Main drinking water source was well (78.3%) and the pump was next (15.0%). 33.3% of all drinking water sources were beeing used by more than 6 househods. 96.1% of all drinking sourees (except pumps) were not covered and the drainage was bad in 30.0% of all drinking sources. 3. 47.0% of all households were disposing sewage unsanitarily and most of the rubbishes (93.2%) were beeing used for a compost. 4. 1% of the households were throw them away around their houses. Excrements were beeing used for fertilizer among 97.9% of all households. 4. The average hardness of 36 sampled well water was 188 ppm and the hardness of 7 samples(19.5 %) were over 300 ppm. 5. The average pH of 36 well surveyed were 6.48. Two samples were below 5.5 and 4 were over 7.1. 6. The average chloride ion of all samples were 75.2 ppm. The chloide ion of 4 samples were over 150 pPm, the international standard for drinking water.

化學펄프 製造에 微生物의 應用 可能性

李宣鎬,尹炳虎,李元用 江原大學校 森林科學硏究所 1997 Journal of Forest Science Vol.13 No.-

要 約 백색부후균인 Fomes pini (Thore) Lloyd에 의해 처리된 chip을 anthraquinone(AQ)을 첨가하여 화학 펄프화를 실시하여 얻은 결과를 미처리재의 것과 비교하였다. 균처리함에 의해 카파값 20에서의 H factor는 소다와 크라프트 증해에서 각각 17%와 15%가 감소되었다. 이러한 결과는 목재를 백색부후균으로 처리함으로 인해 탈리그닌이 용이해졌음을 나타내는 것이다. 비페놀성 β-0-4 화합물인 veratrylglycerol-β-guaiacyl ether(I)와 페놀성 β-0-4 화합물인 syringylglycerol-β-syringyl ether(III)에 백색부후균을 작용시키면 반응생물로서 각각 α-guaiacoxy-β -hydroxypropioveratrone(II)과 α-syringyloxy- β -hydroxypropiosyringone (IV)이 생성됨이 밝혀겼다. 따라서 목재에 균처리를 함으로서 카르보닐기가 리그넌의 측쇄 α위에 도입되어 그로 인해 탈리그닌이 용이하게 된 것으로 여겨진다. ABSTRACT The decayed wood by Fomes pini (Thore) Lloyd required a smaller H factor than the sound wood for pulping to permanganate number 20. The H factors for the wood pulping by the kraft and soda processes were reduced by 15% and 17%. respectively. in the presence of 1% anthraquinone. The wood components degraded by fungi are normally more readily solubilized in alkali than the corresponding components in sound wood. The nonphenolic β-0-4 type lignin model compound. veratrylglycerol-β-guaiacyl ether(I), and phenolic model compound, syringlglycerol-β-syringyl ether(III). were degraded by the white-rot fungi to yield α-guaiacoxy-β-hydroxypropioveratrone(II) from the former and α-syringyloxy-β-hydroxypropiosyringone(IV) from the latter. Structures of the degradation products indicated that C r-oxidation could occur with wilite-rot fungi. It has been shown that the alkaline cleavage of β -aryl ether bonds in the lignin units is accelerated by the presence of α-carbonyl groups.

變斷面 圓弧아-치의 數値解析에 관한 硏究

朴文浩,李炳求 東亞大學校 大學院 1979 大學院論文集 Vol.3 No.-

The governing differential equations for the hinged-tapered circular arch have been derived, and a numerical procedure for the solution of these equations have been developed. The governing differential equations were solved numerically by an initial value integration procedure and Shooting methods for boundary value problems. The Runge-Kutta integration technique was used. The numerical solution was made through a Cyber 73-18 computer. A numerical example for a hinged-tapered circular arch with a half central angle of 0.7 radian were solved, and the results were compared with that of a fixed-tapered circula arch. The results of this study can be utilized to determinate the deflections, angle of slope, bending moments and torsional moment of thin and long hinged-tapered circular arch design.

효율적인 공급체인관리를 위한 협력업체 평가구조분석 및 선정에 관한 연구

金鎭鎬,李丙玘 明知大學校 産業技術硏究所 2004 産業技術硏究所論文集 Vol.23 No.-

In supply chains, coordination between a purchaser and supplier is regarded as the most important issue when partnership of organizations is considered. Since the suppliers are external to the purchaser and poor coordination between them results in excessive delays and ultimately leads to poor customer service, purchasers need a new methodology to select suppliers and to manage and enhance the partnerships between purchaser and suppliers. This paper studies a supplier evaluation structure and then suggests a methodology using fuzzy theory for selecting an effective supplier. Several quantitative and qualitative evaluation factors should be analyzed in the supplier evaluation structure.