라벨링과 레벨세트 이론을 이용한 양방향 곡선 전개 형태 추출

박수형,하진일,주동현,염동훈,김두영 동아대학교 정보기술연구소 2002 情報技術硏究所論文誌 Vol.9 No.2

In this paper, We propose the method of initial curve creation in levelset evolution for the edge of objects or the shape extractions. The shape of traditional initial curve is including edge. But we improve the speed of processing to draw many initial curve using special parameter which was solved by binary processing and sequence labeling. In particular, it is necessary to efficiently reduce noise, we use anisotropic diffusion filter. This filter is to reduce blurring that is the fault of traditional filter processing and to preserver an accurate edge part. The levelset method using inward and outward evolution extracts the edge of object drawn initial curve, it performs to calculate shrinking and expanding at the same time.

계면활성제의 체인길이에 따른 구형 MCM-41의 합성

이두형,최병열,장원철,서길수,이태진 영남대학교 공업기술연구소 1999 工業技術硏究所論文集 Vol.27 No.1

Mesoporous MCM-41 exibits a hexagonal arrangement of uniform mesopores whose dimensions may be engineered in the range of ∼20Å to greater than 100Å. The MCM-41 typically have high surface areas above 1000m2/g, and then capacities of MCM-41 to accommodate the larger hydrocarbon is still higher than the general molecular sieve. At the present, many surfactants as organic templates have been proposed for various formations of these MCM-41. In this study, we synthesized mesoporous MCM-41 which has a spherically hexagonal structure. Also, the pore size of MCM-41 could be changed by the control of alkyl chain length of surfactants.

유체-구조물-지반 상호작용을 고려한 항만구조물의 지진응답 해석

김두기,류희룡,장성규,서형렬 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-

This paper presents the result of a study on the fluid-structure-soil interaction(FSSI) of a port structure under earthquakes. In this analysis, the fluid is modeled by the 4-node element which is a modification of a structural plane elements, and the port structure and foundation is modelled by the plane strain elements. Since the present method directly models the fluid-structure-soil interaction system by finite elements, if can be easily applied to the dynamic analysis of a 2-D port structure with complex geometry. Finally, results of seismic analyses are presented and compared to those of the seismic coefficient and the added mass methods.

Amplatzer Septal Occluder를 이용한 심방중격결손 폐쇄의 초기 성격

이형두,박지애 부산대학교 병원 암연구소 2009 부산대병원학술지 Vol.- No.25

심실 중격 결손에 동반된 승모판 폐쇄부전

이형두 동아대학교의과대학 1997 동아의대학술지 Vol.9 No.2

初等學校 學生의 放課後 餘暇活動 實態調査 硏究

강두언,이세형 濟州大學敎 體育科學硏究所 1999 체육과학연구 Vol.5 No.-

The purpose of this study was to explore an efficient leisure activity guidance method for children, byexamining the fifith of sixth grade elementary school students view of leisure, their actual after-school leisure activities and their favorite leisure activities and gy seeking a means to have them have a right understanding of leiwure and to create better leisure environment The findings of this study were as follows : 1) The Consciousness of Lisure First, the subjects considered the meaning of leisure to kill time at one's option Second, they viewed leisure activities as indispensable and thought the bevefit of leisure activities wasto recreate oneself Third, they had an opinion that leisure activities had influence on learning and had a relation to health 2) The Actual After-School Leisure Activities First. the largest number of them went to an private tutoring institute named Hagwon weekdays after school. Most of them conducted leisure activities at home. Second, many of them enjoyed leisure activities for 3 or 4 hours over the weekend(or holidays). A large number of them watched television as leisure activity. and many other students got exercise. played away their time, or did something they were interested in for pleasure. Third, during vacation, the largest number of them did something they were interested in or had a talent for. Fourth. the person with whom they spent spare time was a friend. Boy students mainly played or got exercise with their friend in spare time, while girl students had a talk with their friend. Fifth, they watched television for 3 hours or more after school. The greatest number of them watched entertainment. comedy or show program. Sixth, they spent ten thousand won or less a month for leisure activities. The background variables made no difference to this point. Seventh, they thought they had enough spare time for leisure, and were satisfied with their current leisure activities. They used spare time so far to kill time without specific meaning, to recreate themselves. or to dispel stress. 3) Their Favorite Leisure Activities First. the type of leisure activity boy students most wanted to do was sports. followed by trip and electric entertainment game in the order named. For girl students, the most preferred one was a trip. followed by camping and sports in the order named. To enjoy better leisure activity. boy students called for sporting goods or recreation tools more than girl students, while many girl students called for cultural facilities( television or computer) or a friend. Second, concerning the fifth-grade students' favorite exercise, boy students in central area liked soccer most, and the next preferred one was baseball. Boy students in the suburbs of city was most fond of soccer and the next one was basketball. Girl students in central area liked dodge ball or badminton. and girl students in the suburbs were fond of dodge ball or swimming. For the sixth-grade students. boy students preferred soccer or basketball. Girl students in central area were fond of dodge ball or rollerskating. and girl students' favorite one in the suburbs was swimming or dodge ball. Third, the factor that made it difficult for them to enjoy leisure activities was work on studies and the lack of parent's understanding.

지구 온난화 문제에 대한 국내외 동향과 그 대책에 관한 연구

장원철,이두형,이태진 嶺南大學校 環境問題硏究所 1998 環境硏究 Vol.18 No.1

최근 전세계적으로 지구 온실효과 가스에 의해 야기되는 지구 온난화 현상에 대해 여러 가지 대응방안이 고려되고 있고 특히, 화석 연료의 사용과 관련된 이산화탄소에 의한 지구 온난화와 기후변화는 가장 심각한 문제로 나타나고 있다. 이런 전세계적인 우려는 마침내 기후변화에 대한 정부간 협의체인 COP를 결성시켰고 마침내 지난 1997년 12월 제3차 교토 COP에서 마침내 지구 온난화에 대한 국제적 규제사항으로 배출권거래제도, 공동이행제도, 자발적 협정 내용들이 논의 및 결정되었다. 그러나 이런 국제적인 논의에도 불구하고 국내의 이에 대한 대책은 단지적인 정책 대응에 미치고 있는 실정이다. 그러므로 본 논문은 이런 상황과 결부하여 지구 온난화에 대한 전반적인 상황고찰과 그 대응책으로 지구 온난화 물질 배출에 대한 통계체제 확립, 에너지 절약 및 효율 개선책 마련, 토지의 효율적 이용과 산림관리, 대체에너지 개발과 이산화탄소 이용에 대한 연구개발 확대, 이에 대한 전문인력 확보방안에 대해 그 의견을 개진하여 논의하고자 하였다. This paper gives a consider of recent status and possible countermeasures against global warning caused by gases of the green house-effect. Especially, the global warming and climate change caused by the accelerative emission of carbon dioxide in the atmosphere are the most crucial for human beings. The worldwide anxiety has resulted in the operation of COP (United Nation's Framework Convention of Climate Change) and the 3rd conference on COP was held in the early of December 1997 at Kyoto, Japan. Naturally, several scenarios planned on governmental or political basis was focused on strategic topics, such as the restruction on the amount of consumption of fossil fuels through 'Joint Implementation', 'Eaission Trading', and 'Voluntary Agreements' for the use of carbon sources. Although the climate change issue has been actively discussed in the world, the status of countermove in Korea is only now turning activity and under-develpment situation. This work reviews the conflicts embodied in contemporary debates concerning climate change, technology development, and economic restriction and suggests political strategies for the global warming, such as a construction of monitoring system on gases of green house effect-gas, energy saving, the development of alternative energy, the efficient use of a forest, and rearing of experts.

블럭탐색 제어를 이용한 프랙탈 영상 부호화 시간 향상과 컬러 영상에의 응용

박철우,정동웅,김태형,김두영 東亞大學校 附設 情報通信硏究所 1996 情報通信硏究所論文誌 Vol.4 No.1

In this paper, in order to reduce block search area during the process to determine the coefficient of IFS transform equation in Fractal Coding, We performed the following steps : First, We partitioned Domain blocks and Range blocks with certain critical point determined by the edge characteristcs and the direction of brightness. When similar block's detected, the Domain block in the same class of the given range was only searched. Second, When the processing is on, We determined the linear list structure with the second error limit, We, therefore, could control coding time, We tryed to improve the compression rate of the Image with reducing the number of times of tranformation by changing the area of block with Quadtree Partitioning, and also tried to progress the fidelity of the image by changing the search density of search area, according to the magnitude of range block. We applied these method to image compression of 24-bpp color. First of all, after converting the RGB coordinate into YIQ Coordinate which has brightness signal and chrominance signal, We minimized by a quarter and coded I,Q signal which implies the information of the color but takes just small part at image information and on the case of decoding, with linear interpolation method we got I,Q signal enlarged as it was. All throughout these processing, We could find out that There are no damages on the original image, and we are able to make better result on compression rate and fidelity of image comparing with those of conventional Fractal Coding method which was applied to the RGB images.

생물학적 유동층의 Media 충진량에 따른 미생물 농도 변화

김환기,최두형,박찬수 全北大學校 附設 都市및環境硏究所 1998 都市 및 環境硏究 Vol.13 No.1

The variation of microbiological concentration with packed volume of media was examined in the biological fludized bed which has swirl flow. The TOC and HRT of synthetic wastewater was kept with 70 ㎎/ℓ and 1.6 hr in the reactor, respectively. The mean grain size of sand as media was 0.397 mm and its volume was packed from 20 % to 60 % in the reactor. The experiment results from the above conditions were the treatment efficiency of 87.5 to 93.7 %, the MLVSS of 2,360 to 3,860 ㎎/ℓ, and the microbiological concentration per g-media of 8.4 to 17.3 ㎎/ℓ. The detailed results are as follows. 1) The continuous operation was possible in the biological fludized bed which has swirl flow, not existing fludized bed. 2) The whole microbiological concentration in the reactor was the highest at packing the media volume of 40 to 45 % and the microbiological concentration per g-media was the highest at packing the media volume of 25 %. In the viewpoint of SS, the best packing volume of media was 35 to 45 % in that the separation of microbes were the lowest. 3) From SEM photographs, it showed as that cocci and bacillus adhere to and grow on the media surface

사람 Ferritin 유전자를 이용한 담배의 형질전환

이주안,김형석,임채완,김해영,박영두 경희대학교 생명자원과학연구원 2002 硏究論文集 Vol.22 No.-

사람 H-chain ferritin 유전자를 Agrobcterium-mediated transformation 방법으로 담배(Nicotiana tabaccum L)에 전이시켰다. 이를 위하여 사람 H-chain ferritin 유전자를 C_(S)VMV promotor와 NOS terminator를 운반하는 plant binary vector, pILTAB 357에 도입하였다. pILTAB 357를 포함하는 Agrobcterium tumefaciens LBA4404로 담배 잎 절편체를 감염시킨 후 형질전환 신초는 MS배지에 1 5 ㎎/L BA, 50 ㎎/L kanamycin 그리고 200 ㎎/L cefotaxim이 첨가된 1차 선발배지에서 유도하였다. 유도된 신초는 MS배지에 100 ㎎/L kanamycin과 200 ㎎/L cefotaxim이 포함된 2차 선발배지에서 뿌리를 유기하였다. 뿌리가 형성된 재분화 개체는 온실에서 재배하였으며 자가수분하여 종자를 수확하였다. 사람 H-chain ferritin유전자의 담배 genome내로의 전이여부를 H-chain ferritin 유전자내의 primer를 이용하여 PCR 방법으로 확인한 바 형질전환 개체에서 예상했던 560bp 단편을 볼 수 있었으나 형질전환을 시키지 않은 식물체에서는 PCR 산물을 확인할 수 없었다. Kanamycin 저항성 분석은 전이유전자의 후대로의 안정적인 유전을 보여 주었으며 저항성 종자들은 homozygous개체를 확보하기 위해 온실에서 재배 중에 있다. A human H-chain ferritin gene was introduced into tobacco (Nicotiana tabaccum L.) plants by Agrobcterium-mediated transformation. To introduce this gene, human ferritin gene was cloned into plant binary vector, pILTAB 357, horboring CsVMV promotor and nopalin synthase terminator (3' NOS). After infection with Agrobacterium tumefaciens LBA4404 containing pILTAB 357, transformed shoots were induced from first selection media (MS media + 1.5 ㎎/L BA + 50 ㎎/L kanamycin + 200 ㎎/L^(1) cefotaxim). Induced shoots were rooted in second selection media (MS media + 100 ㎎/L kanamycin + 200 ㎎/L cefotaxim). Rooted shoots were cultivated, selfed, and seeds were harvested in the green house. To confirm the transfer of the human H-chain ferritin gene in the genome of tobacco plants, PCR was conducted using specific primers of the H-chain femritin gene. A PCR fragment of 560 bp was obtained from each transformed plants, which is the predicted size of the H-cham ferritin gene but not from nontransformed plants. Kanamycin resistance assay showed that transgenes were stably inherited to next generation in all lines. These resistance seeds from each line were cultivated in the green house to obtain homozygous lines for further study.