가토 외고정 모델을 이용한 치밀체형 세라믹스의 골결합능 평가

이재협,이동호,이재학,공현식,안영준,류현승,서준혁,홍국선,김환,장봉순,이춘기 대한정형외과연구학회 2003 대한정형외과연구학회지 Vol.6 No.2

Voxel머리팬텀 제작 및 붕소중성자포획요법 선량계산에의 응용

이춘식,이춘익,이재기 대한방사선 방어학회 2001 방사선방어학회지 Vol.26 No.2

해부학적으로 단순한 수학적인형팬텀의 한계를 극복하기 위한 voxel머리팬텀을 제작하고 BNCT(Boron Neutron Capture Therapy) 시행 시 선량분포를 계산하였다. 일반목적 몬테칼로 코드인 MCNP4B의 반복구조 알고리즘을 이용하여 voxel몬테칼로 계산체계를 수립하였고 두 가지 물질로 구성된 예시적 voxel팬텀과 기하체조합팬텀의 계산값 비교를 통해 계산체계를 검증하였다. 미국 NLM(National Library of Medicine)에서 제공하는 VHP man 인체단층사진에 대한 분할 및 색인작업을 통해 voxel머리팬텀을 제작하여 AP 및 PA 방향에서 입사하는 넓고 평행한 광자 및 중성자빔에 대한 선량값을 MIRD팬텀의 계산값과 비교한 결과 중성자빔 AP방향조사 시 MIRD팬텀에서는 볼 수 없는 안구로 인한 중성자 감쇠현상을 확인할 수 있었다. 3차원 정밀계산이 필요한 BNCT 시술시 선량분포계산을 위해 뇌 중앙에 직경 5cm의 구형 뇌종양 체적을 정의하고 뇌와 종양의 붕소 함량을 조정하여 10keV 및 40keV 상부입사 중성자에 의한 장기별 흡수선량을 계산한 결과 종양에 30㎍/g, 정상세포에 3㎍/g 의 붕소를 주입한 경우 붕소함량이 없을 때에 비해 2배 가량 큰 선량을 보였다. 본 연구를 통해 voxel몬테칼로기법을 이용한 선량평가체계를 수립하였고 정밀한 선량계산을 필요로 하는 치료방사선분야 선량계산에 실제 인체에 가까운 voxel팬텀의 응용가능성을 제시하였다. Voxel head phantom for overcoming the limitation of mathematical phantom in depicting anatomical details was constructed and example dose calculation for BNCT was performed. The repeated structure algorithm of the general purpose Monte Carlo code, MCNP4B was applied for voxel Monte Carlo calculation. Simple binary voxel phantom and combinatorial geometry phantom composed of two materials were constructed for validating the voxel Monte Carlo calculation system. The tomographic images of VHP man provided by NLM(National Library of Medicine) were segmented and indexed to construct voxel head phantom. Comparison of doses for broad parallel gamma and neutron beams in AP and PA directions showed decrease of brain dose due to the attenuation of neutron in eye balls in case of voxel head phantom. The spherical tumor volume with diameter, 5cm was defined in the center of brain for BNCT dose calculation for downward neutron beam of 10keV and 40keV, the tumor dose is about doubled when boron concentration ratio between the tumor to the normal tissue is 30㎍/g to 3㎍/g. This study established the voxel Monte Carlo calculation system and suggested the feasibility of precise dose calculation in therapeutic radiology.

The Knight’s Tale and The Miller’s Tale as One Tale

Lee,Dong-Choon 신영어영문학회 2011 신영어영문학 Vol.49 No.-

Lee, Dong-Choon. The Knight’s Tale and The Miller’s Tale as One Tale. The New Studies of English Language & Literature 49 (2011): 103-131. The first two tales-the Knight’s Tale and the Miller’s Tale-of the Canterbury Tales are the representative examples that reflect not only the narrative technique of the “juxtaposition of opposites,” but also Chaucer’s narrative tendencies. The special poetic achievements (and limitations) of each are seen most clearly when the two tales are read together, one in the light of the other, as their juxtaposition invites. The Knight’s Tale and the Miller’s Tale, when read together, are the representative examples which tell what Chaucer attempts to show through his narrative technique of the juxtaposition of opposites and what attitude he expects from a reader. Chaucer does not mechanically indoctrinate an unique view of the world to the readers. He, avoiding his authorial stance on a certain limited view embodied in each tale, forces the specific views of the narrative onto the reader. It is through the juxtaposition between the completely different two tales in such things as tale-teller, plot, character, language, and the narrative voice that Chaucer creates the multiplicity of voice and the plurality of theme, and he trains a reader to grope for meaning from various sides. (Daegu University)

最近 3年間 本敎室에서 經驗한 腫瘍 253例에 對한 臨床病理組織學的 考察

李揆鶴,高永春,李廷鎭,朴鍾雲,李鍾元,林鍾福,林春悅,朴順道 최신의학사 1964 最新醫學 Vol.7 No.4

Special Issue of Professor Kiehwa Lee`s Retirement: Geophysical Environments of the Korean Peninsula : Articles ; Geoelectrical Structure of the Kyongsang Basin from Magnetotelluric Sounding

( Choon Ki Lee ),( Heui Soon Lee ),( Byung Doo Kwon ),( In Ky Cho ),( Seok Hoon Oh ),( Yoon Ho Song ),( Tae Jong Lee ) 대한지구물리학회 2006 지구물리 Vol.9 No.3

Phosphorus Removal in Pilot Plant Using Biofilm Filter Process from Farm Wastewater

Shin, Sung-Euy,Choi, Du-Bok,Lee, Choon-Boem,Cha, Wol-Suk The Korean Society for Biotechnology and Bioengine 2006 Biotechnology and Bioprocess Engineering Vol.11 No.4

Various environmental conditions affecting total phosphorus removal from farm wastewater in a biofilm filter process were investigated using loess balls and Chromobacterium LEE-38 at a pilot plant. When Chromobacterium LEE-38 was used, the removal efficiency of total phosphorous was approximately 10- or 5-fold higher than that of Acinetobacter CHA-2-14 or Acinetobacter CHA-4-5, respectively. When a loess ball of $11{\sim}14mm$ manufactured at a $960^{\circ}C$ calcining temperature was used, the removal efficiency of total phosphorous was 90.0%. When 70% of the volume fraction was used, the maximum efficiency of total phosphorus removal was 93.1%. Notably, when the initial pH was in the range of 6.0 to 8.0, the maximum removal efficiency of total phosphorus was obtained after 30 days. When the operating temperature was in the range of 30 to $55^{\circ}C$, the maximum removal efficiencies of total phosphorus, 95.6 to 94.6%, were obtained. On the other hand, at operating temperatures below $20^{\circ}C$ or above $40^{\circ}C$, the removal efficiency of total phosphorous decreased. Among the various processes, biofilm filter process A gave the highest removal efficiency of 96.4%. Pilot tests of total phosphorus removal using farm wastewater from the biofilm filter process A were carried out for 60 days under optimal conditions. When Acinetobacter sp. Lee-11 was used, the average removal efficiency in the p-adsorption area was only 32.5%, and the removal efficiencies of chemical oxygen demand (COD) and biological oxygen demand (BOD) were 56.7 and 62.5%, respectively. On the other hand, when Chromobacterium LEE-38 was used, the average removal efficiency was 95.1%, and the removal efficiencies of COD and BOD were 91.3 and 93.2%, respectively.

Phosphorus Removal in Pilot Plant Using Biofilm Filter Process from Farm Wastewater

차월석,Sung-Euy Shin,DuBok Choi,Choon-Boem Lee 한국생물공학회 2006 Biotechnology and Bioprocess Engineering Vol.11 No.4

Various environmental conditions affecting total phosphorus removal from farm wastewater in a biofilm filter process were investigated using loess balls and Chromobacterium LEE-38 at a pilot plant. When Chromobacterium LEE-38 was used, the removal efficiency of total phosphorous was approximately 10- or 5-fold higher than that of Acinetobacter CHA-2-14 or Acinetobacter CHA-4-5, respectively. When a loess ball of 11~14 mm manufactured at a 960°C calcining temperature was used, the removal efficiency of total phosphorous was 90.0%. When 70% of the volume fraction was used, the maximum efficiency of total phosphorus removal was 93.1%. Notably, when the initial pH was in the range of 6.0 to 8.0, the maximum removal efficiency of total phosphorus was obtained after 30 days. When the operating temperature was in the range of 30 to 55°C, the maximum removal efficiencies of total phosphorus, 95.6 to 94.6%, were obtained. On the other hand, at operating temperatures below 20°C or above 40°C, the removal efficiency of total phosphorous decreased. Among the various processes, biofilm filter process A gave the highest removal efficiency of 96.4%. Pilot tests of total phosphorus removal using farm wastewater from the biofilm filter process A were carried out for 60 days under optimal conditions. When Acinetobacter sp. Lee-11 was used, the average removal efficiency in the p-adsorption area was only 32.5%, and the removal efficiencies of chemical oxygen demand (COD) and biological oxygen demand (BOD) were 56.7 and 62.5%, respectively. On the other hand, when Chromobacterium LEE-38 was used, the average removal efficiency was 95.1%, and the removal efficiencies of COD and BOD were 91.3 and 93.2%, respectively.

폐폴리우레탄 폼을 이용한 유출유 흡수 : Oil, oil/water, 인공해수조에서의 흡유 특성 분석 Estimate of Sorption Properties in Oil, Oil/water, Artificial Seawater

이현구,이춘부,김형순 한국공업화학회 2003 응용화학 Vol.7 No.2

This study investigates the effectiveness of rigid, semi-rigid, and flexible waste polyurethane foams for oil spills clean up. For the three types of the waste foams used as a sorbent, rigid sandwich panel foam, head rest and high-resiliency seat foam in automotive applications were selected, respectively. And the foam of each type also was synthesized with the recipe based on it. The sorption test of the above foams were performed in different types of petroleum products, diesel, bunker-A, and-C, as a function of temperature, and in the presence and absence of water as well. Reuse-ability of the foam were confirmed through measuring for the change of maximum sorption capacity according to sorption cycles. Finally, the same experiments were carried out in artificial seawater bath in order to estimate that actual sorption properties in the sea.

정부관리에서 민간관리로 전환하는 일본의 신 맥류정책

이춘우,백성범 한국국제농업개발학회 2002 韓國國際農業開發學會誌 Vol.14 No.2

일본의 맥류 생산, 연구, 보급, 가공 및 유통에 대한 정책의 전개 방향을 설정한 신 맥류정책이 발표되었으며 이를 해설한 日本의 麥政策 이라는 책이 출간되었다. 이 책에는 향후 일본의 맥류 생산, 연구, 보급, 가공 및 유통에 대한 정책 설명과 정부의 대책이 해설하고 있다. 이 책이 우리나라의 맥류정책 수립에 참고자료로 활용될 수 있도록 요약하여 소개한다. 1. 생산자, 수요자 및 정부가 각자가 신 맥류정책에 부합한 생산비 절감을 위한 종합적인 노력하고, 문제점은 장기적인 시간을 가지고 해결을 모색한다. 2. 국내산 맥류는 민간유통에 맡기고, 생산자와 실수요자가 품질평가를 반영하여 직접 인수체계를 만들고 양질의 맥류생산 계획을 세운다. 3. 연구개발의 충실 및 강화로는 생산자, 실수요자의 의견을 품종개발에 반영하기 위하여 개발단계부터 생산자와 실수요자의 평가를 반영할 수 있는 새로운 체제를 설정한다. 4. 외국산 맥류는 국가무역에 의한 정부가 계획적으로 수입 및 효율적인 운영을 도모한다. 5. 사료용 맥류는 증산제도는 대체사료의 개발, 보급, 각종기업대책 등의 추진하여 2002년까지 폐지하고 특정맥류를 SBS(매매동시입찰)방식으로 단계적으로 도입한다. Japans agricultural situation is similar to Korea where many food crops are imported and the sector is heavily protected. The Ministry of Agriculture, Forestry and Fisheries in Japan announced a new policy to develop the wheat and barley sub-sectors. This policy aims to increase attention given to the cultivation, research, extension, and dissemination of technologies for these crops. The basic strategy is to transfer the management and control of wheat and barley from the government to the private sector. The production of wheat in Japan does not meet its demand because local wheat does not have good quality and price. This is one of the reasons why milling companies do not buy Japanese wheat. This study was conducted to look into this new policy and compare it with the developments in the Korean wheat and barley sub-sectors.

兒童의 空間眺望能力의 發達에 관한 硏究: 對象剌戟의 親熟性과 辨別性의 效果

李春載 聖心女子大學校 1981 論文集 Vol.12 No.1

兒童의 空間眺望能力의 發達을 剌戟變因을 中心으로 觀察했다. 空間眺望을 測定하는 道具로 사용되는 對象剌戟을 親熟性, 辨別性, 對象剌戟의 數(1개와 3개)를 달리하여 모두 8개의 다른 課題를 만들어, 유치원, 국민학교 2학년 및 4학년에서 각각 여학생 20명씩 모두 60명의 피험자에게 실시했다. 對象剌戟의 親熟性이 높을수록 他人의 空間眺望 理解能力이 높았으나, 對象剌戟들間의 辨別性의 정드는 兒童의 他人에 대한 空間眺望의 理解能力에 영향을 주지 못했다. 또 兒童의 空間眺望能力은 對象剌戟個個의 方向에 대한 理解가 먼저 발달하고 그 다음에 個別剌戟間의 位置에 대한 理解가 發達하는 것으로 밝혀졌다. The purpose of the study was to observe the development of children's spatial perspective taking ability as a function of familiarity and differentiation of object stimuli. Twenty kindergartners, 20 second graders, and 20 fourth graders were taken on 8 tasks varied in familiarity, differentiation, and number of object stimuli. The higher the familiarity of object stimulus was, the better the understanding of spatial perspective was. But the differentiation between object stimuli did not facilitate the development of spatial perspective taking ability. It was also found that the understanding of the orientation of each object stimulus, as a function of viewer's changed position, preceded the understanding of the positional relationship between each object stimulus.