침전법에 의한 알루미나 분말제조 Ⅲ. 소결체의 열적·기계적 특성

임헌진,이홍림,이형직,홍기곤 연세대학교 산업기술연구소 1992 논문집 Vol.24 No.1

A precipitation method was adopted in order to prepare high-tech Al₂O₃ceramics. Al₂(SO₄)₃·18H₂O was used as a starting materials and alumimum hydroxides were obtained by single precipitation method at the pH condition 7 and 11, using NH₄OH as a precipitation agent. Fine Al₂O₃powders were prepared at optimum calcination condition and were sintered at 1650℃ for 4 h in air. Microstructures and mechhanical properties of Al₂O₃ceramics were investigated. Doped MgO limited the grain growth of Al₂O₃and increased grain size homogeneity of Al₂O₃Flexural stregth values were 340∼430 MPa. Critical temperature difference?? was 175 K showing rapid strength degradation by thermal shock.

THE DEVELOPMENT OF A UV FLAME DETECTOR FOR THE AUTOMATIC FIRE SUPPRESSION SYSTEM FOR ENGINE COMPARTMENT FIRES

Lim,Sung-Mook,Jung,Ki-Chang,Kim,Eung-Sik,Kim,Hong 한국화재소방학회 1997 한국화재소방학회 학술대회 논문집 Vol.1997 No.-

In this work, a new type of UV flame detection system was developed. In order to measure the performance of UV flame detector, various kinds of experiments was performed. The results show that the maximum response time of the UV flame detector is 0.2 seconds when the detection distance is one meter The advantages of this system include wide area, high speed response and high sensitivity. After testing the W flame detector in engine compartment it detected fire within 0.09 seconds and extinguished within 5 seconds. Hence, the UV flame detector can be applied in automatic fire suppression system for automobiles.

사카모토 료마의 국가 건설사상

임태홍(Lim Tai-hong) 한국정치사상학회 2004 정치사상연구 Vol.10 No.2

이 연구는 사카모토 료마의 ‘선중팔책’이 나오게 된 배경과 그 사상적인 특징을 살펴본 것이다. 그의 제안은 단순한 구상에 머문 것이 아니라 이후 ‘대정봉환’이나 ‘메이지유신’ 등으로 현실화되었다. 그의 정치적 입장은 분열되어 있는 각 정치세력을 하나로 묶어 강력한 통일정부를 만드는 데에 있었기 때문에, 그에 대한 연구는 일본 근대의 정치사상을 이해하는데 있어 그리고 아직도 진정한 의미의 민족국가 수립을 못하고 있는 우리 민족에게는 매우 중요하다고 할 수 있다. 본론에서는 ‘선중팔책’을 중심으로 사카모토 료마의 행적과 그 배경을 살펴보고 ‘선중팔책’의 내용과 특징을 고찰하였다. 특징을 명확히 하기위해서 멀리 중국과 한국의 사례와 비교해보았다. 중국의 경우는 태평천국시기에 룽훙(容?)이 태명천국에 제시한 방안과 청말의 쑨원(孫文)이 리홍장(李鴻章)에게 제출한 건의안, 그리고 한국은 동학 운동시기의 폐정개혁안과 갑신정변시 개화파가 제시한 신 정령 14개 조항을 참고하였다. 사카모토 료마의 ‘선중팔책’은 메이지 유신 직전에 제시되었는데, 그 당시 일본의 대표적인 건국 방략이라고 할 수 있다. 그의 제안은 국가의 정체(政體), 사법, 행정, 의회, 외교, 헌법, 군대 등 범위가 광범위하며 어느 한쪽으로 편증되어 있지 않다. 그리고 지국의 문제를 일본을 넘어선 국제적인 시간에서 파악하려는 특징이 강하다. 또한 ‘선중팔책’에는 서구의 의회정치나 법률, 외교 등의 제도를 적극적으로 받아들이려고 한 사카모토 료마의 노력이 뚜렷이 드러나 있다. 중국이나 우리나라의 개혁안과 비교해 보면, 사카모토 료마와 그 주변 사람들의 상황인식이 얼마나 폭이 넓고 깊이가 있었는가를 잘 알 수 있다. ‘선중팔책’은 이미 서양에서 진행되고 있었던 근대 국가 건설의 핵심을 정확히 짚어내고 또 그러한 시대적인 방향을 정확히 제시하였다는 점에서 매우 평가할 만한 방책이었다고 할 수 있을 것이다. This paper examines the Sakamoto Ryoma's "Great Plan at Sea" or eight-point plan, which he wrote aboard ship in 1867. Especially, It is focused on the background of the plan's formation and its feature as a nation building thought. Sakamoto's plan was very important. Because it was not merely an idea, but became a real after a few months. For example by his proposal, Yoshinobu Tokugawa, the 15th Shogun of the Tokugawa Shogunate, returned his political power to the Emperor, that is the so-cold "The Return of Sovereignty"(Taisei Houkan) of November 1867. In the main part, the writer examines the Sakamoto Ryoma's circumstance and analyzes the contents and the feature of the Sakamoto's plan. In order to clarify the plan's feature, this paper attempts to compare the plan to the Long Hong's(容?) proposal to Taiping Heavenly Kingdom, the Sun yatsen's(孫文) suggestion to Lee Hong-Chang(李鴻章), the Jeon Bong-Jun's(全琫準) reforming politics plan in the Dong Hak movement, and the reformists' 14 suggestions of the Military Revolution (the Kapshin coup) in 1884. The eight-point plan of Sakamoto Ryoma was suggested right before Meiji Restoration(1868). It was a representative plan for nation building in the era of Modern Japan. Sakamoto's proposal broadly included the system of government, judicature, administration, assembly, diplomacy, constitution, and troops, etc. Although the plan was concern with the domestic affairs of Japan, it had the international judgment, and was most distinctively beyond the boundary of the country. In the Sakamoto's plan, there was a remarkable effort to receive the Westem civilization of the times. Comparing with the cases of Long Hong's, Sun yatsen's, and Jeon Bong-Jun's, Sakamoto's recognition about the era and the circumstance around his country was very spacious and very deep. In conclusion, Sakamoto Ryoma seemed to have a clear grasp of the essence of nation building movement of Western Countries, and his eight-point plan for Modern Japan showed his country the correct way of the new times.

연령증가에 따른 혈압요소들의 좌심실비대 및 관동맥질환과의 관련성

박재석,박창규,박미영,박재형,김용현,나진오,신성희,서순용,홍순준,박성미,임홍의,김응주,서홍석,오동주,노영무 대한순환기학회 2004 Korean Circulation Journal Vol.34 No.2

유니버셜모터의 저차 고조파전류 저감을 위한 속도제어기에 관한 연구

임홍우,박수강,백형래 조선대학교 에너지.자원신기술연구소 2000 에너지·자원신기술연구소 논문지 Vol.22 No.1

Universal motors are commonly used for portable tools and other application. The universal motors can be implied AC or DC voltage source. Phase-angle control AC drive systems gain a high popularity due to their simple implementation despite the disadvantage of their poor input power factor especially for large values of phase delay angle. Futhermore it contains a large amount of subharmonic current. But pulse width modulation controlled DC drive systems reduce these problems. This paper compared the harmonic characteristics of phase angle control AC system that is controlled by TCA785 with zero voltage crossing similar to traditional system and DC chopper system that is used in PWM controller.

낙동강 상수원수의 오존처리 효과 : II. 회분식 오존처리에 의한 휘발성유기화합물 및 조류제거 효과 II. Removal of VOCs and Algae in Raw Water by Conducting Batch Test of Ozonation Experiments

임영식,이홍재,이도진,허종수,손보균,조주식 한국환경과학회 2002 한국환경과학회지 Vol.11 No.12

This study was carried out to evaluate the pollutant removal efficiencies of the advanced drinking water treatment using ozonation process. For raw water, Nakdong River was used. By conducting batch test of ozonation efficiencies of the ozonation were 94 to 92%, respectively. Removal efficiencies of single VOC compound or mixed VOC compounds in the raw water were 80% to 90% by the ozonation with 2 mg/ℓ dosage and 10 minutes contact time. Removal efficiencies of ABS by the ozonation with 1 mg/ℓ, 3 mg/ℓ dosage and 20 minutes contact time were 83% to 96%, respectively. Almost 67% of chlorophyll-a at the concentration of 38.㎍/ℓ was removed by ozonation at ozone dosage of 1mg/ℓ for 20 min. considering the efficiency of ozone utilization and water treatment, the most effective ozonation could be obtained with high ozone dosage and short and short contact time.

연속식 오존처리공정을 이용한 낙동강 상수원수의 정수처리 효과

임영성,강관호,이홍재,서동철,박문수,허종수,조주식 한국환경농학회 2002 한국환경농학회지 Vol.21 No.3

낙동강 상수원수를 대상으로 연속적 오존처리에서 오존주업농도에 따른 유기물 분해 특성을 조사하기 위하여 오존처리에 의한 DOC성분변화, UV254/DOC의 변화와 소비오존에 따른 DOC 제거효율을 조사한 결과는 다음과 같다. 유입원수의 수질변화에 따라 다소 차이는 있었으나 전반적으로 오존주입농도가 증가할수록 DOC 처리효율도 증가되었다. 오존처리에 따른 DOC 성분변화는 전오존을 3 mg/L농도로 처리시 TDOC, ADOC, A&BDOC 및 NRDOC는 각각0.6, 0.2, 0.1 및 1.0 mg/L 정도 오존처리에 의하여 감소되었으나 BDOC는 0.8 mg/L 증가하였다. UV254/DOC의 분율은 오존주입농도를 1, 3 및 5 mg/L 처리하였을 때 전오존의 경우는 각각 0.048, 0.044 및 0.037 이였고, 후오존의 경우는 각각 0.018, 0.015 및 0.012로 나타나 오존주입농도가 증가할수록 감소하는 경향을 보였다. 초기 DOC mg당 소비되는 오존량에 대한 DOC 제거율은 전오존과 후오존처리의 초기 DOC에 대한 소비오존량이 각각 약 1.5와 2.3일 때 각자 25%와 32%로서 최대의 DOC 처리효율을 나타내었다. 낙동강 상수원수에 전오존을 처리할 경우 오존주입량은 초기 DOC mg당 소비된 오존이 1.5 mg 이내의 농도가 되도록 주입하고, 후오존은 유입수인 모래여과수의 초기 DOC mg당 소비된 오존이 2.3 mg이내의 농도가 되도록 조절하여 주입하면 적당할 것으로 생각되었다. This study was carried out to evaluate the pollutant removal efficiencies of the advanced drinking water treatment using ozonation process. For raw water. Nakdong River was used. By conducting continuous ozonation experiments, the following results were obtained. Efficiency of water treatment was enhanced with increase in ozone dosage. When ozone dosage of 3 mg/L was used, preozonation of raw water reduced TDOC, ADOC, A&BDOC and NRDOC as much as 0.6 mg/L, 0.2 mg/L, 0.1 mg/L and 1.0 mg/L, respectively. On the other hand, content of BDOC Increased at the level of 0.8 mg/L. Ratio of UV254 absorbance to DOC content by the preozonation with 1, 3 and 5 mg/L dosage were 0.048, 0.044 and 0.037, respectively. In case of postozonation, it were 0.018, 0.015 and 0.012, respectively. When the ratios of consumpted ozone content to 1 mg of initial DOC were 1.5 and 2.3 in preozonation and postozonation treatment, respectively, the highest DOC removal rates of 25% and 32% were obtained by the continuous ozonation.

침전법에 의한 알루미나 분말제조 IV.ZrO₂의 분산에 의한 Al₂O₃/ZrO₂ 복합체의 제조 및 기계적 특성

홍기곤,이홍림,이형직,이호순 연세대학교 산업기술연구소 1992 논문집 Vol.24 No.2

In this study, a precipitation method, one of the most effective liquid phase reaction, was adopted in order to prepare high-tech Al₂O₃/ZrO₂ composite ceramics. Al₂(SO₄)₃·18H₂O, ZrOCl₂·8H₂O and YCl₃·6H₂O were used as starting materials and NH₄OH as a precipitation agent. Fine powders were prepared at optimum calcination condition. Sinterability of each fine powder and the effects of ZrO₂ on the grain size and mechanical properties of Al₂O₃ were investigated. The composition of Al₂O₃/ZrO₂ composites was fixed as Al₂O₃-15v/o ZrO₂(+3m/o Y₂O₃). The effect of MgO on the grain size of Al₂O₃ZrO₂ ceramics was also investigated.

개심술후 정신의학적 합병증

임기영,조범구,민성길,이홍식,유계준 大韓神經精神醫學會 1985 신경정신의학 Vol.24 No.1

Pre-and post operative psychiatric evaluations were done using semi-structured interview with Hamilton scales for anxiety and depression in 57 open heart surgery receipients to assess post-operative psychiatric complications. Conspicuous post-operative psychiatric complications were observed in 16 (23%) of 57 patients after open heart surgery. Postcardiotomy delirium occurred in seven patients; acute psychotic reaction with paranoid ideation in one; and neurotic reaction in eight. Factors that tended to influence postoperative psychiatric complications were older age, unempolyment, previous medical/psychiatric history, and high level of preoperative anxiety. By analysis of the preoperative psychiatric evaluation, patients could be largely divided in 3 groups; anxiety group, denial group, and adjusted group. Excessive anxiety and massive denial seemed to be signficant in the postoperative psychiatric compliactions. With these findings, the author's impression was that the consultation psychiatrist should give comprehensive psychiatric evaluation and psychiatric preparation in pre-and post-open heart surgery for the possible prevention of postopertive psychiatric complications.

『파우스트』 2부의 비판적 근대인식

임홍배 한국괴테학회 2002 괴테연구 Vol.0 No.14

In der vorliegenden Arbeit wird Faust Ⅱ als Kritische Diagnose der Moderne interpretiert. Unter solchem Gesichtpunkt ist das Helena-Drama als Fausts imagina¨re 'phantasmagorie' im Sinne der zeitlich-ra¨umlichen Entgrenzung zu verstehen, was die gru¨ndliche Sa¨kularisierung des tradierten Kunstbegriffs zur Folge hat und Fausts heroischen Eroberungsdrang zugleich verdeckt und entzu¨ndet. Euphorions Sturz ist dann Vorausdeutung des Faustischen Schicksals, das sich auf der Bu¨hne der realen Wirklichkeit entfaltet, wo Faust sich blindlings ins Unendliche treibt und damit sich verliert. Fausts Freiheitsphantasie, die zum Durchsetzen seiner Zweckrationalita¨t alles zu kosten wagt, kulminiert in der Vollendung seines angeblichen 'Kunstwerks', das sich als sein Grab entlarvt. Die scheinbare Verso¨hnung durch Eingreifen der go¨ttlichen Liebe am Schluβ verliert ihre symbolisierende Intergrationskraft, indem sie im krassen Kontrast zu Fausts selbstischer Befangenheit steht. Die allegorische Form als Kompositionsprinzip von Faust Ⅱ entspricht demnach der Faustischen Antinimie, die in der Unmo¨glichlichkeit besteht, das Subjekt mit seinen symbolischen Bedeutungen zu verknu¨pfen, was wiederum auf die widerspruchsvolle Entwicklung der Moderme hinweist, deren Konsequenzen mit der Beschleunigung der Modernisierung immer folgenschwerere unerwatete Krisen mit sich bringen.