Ruled Surface로 형성된 임펠러 블레이드 전용 CAD/CAM 시스템 개발 Ⅱ : 5-축 가공에 관한 연구 A Study on the 5-Axis Machining

조현덕,정대일,윤문철,최두선,신보성,이응숙,董玉革 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.3

This study is continuous with the study 1 (A Study on the Modeling) and the sample impeller of this study is defined by the modeling process of the exclusive CAD/CAM system developed in the study I. And, this study describes a method for the 5-axis machining of impeller blades formed by ruled surface. Therefore, the exclusive CAD/CAM system is the software for modeling and machining of impeller blades. By using the machining method suggested in this study, we could manufacture impeller blades on 5-axis CNC machining center and the machined impeller was very agreeable to the designed impeller. Thus, theories proposed in this study can be very useful for the 5-axis machining of impeller blades.

배양 표피세포 이식의 생착에 관한 연구

조용근,홍성표,장충현,이두형 大韓成形外科學會 1991 Archives of Plastic Surgery Vol.18 No.1

We cultured the keratinocytes from different donors for 3 weeks and the cultured keratinocyte sheets were applied to the 15 cases of patients who had hypertrophic scars on their extremities. (auto-??allografting) And the applied keratinocyte sheets were studied for the adaptation, growth ?? differentiation with light and electron-microscopy. The results were as follows; 1. Grafted epidermal cells started differentiation from second week post-grafting and showed a similar appearance to the normal epidermis at fourth week post-grafing. 2. Keratohyalind granules were seen from fourth week post-grafting and showed a normal appearance at fifth month post-grafting. 3. Immature desmosome-tonofilament complexes were seen at cultured epidermal sheet and showed a normal appearance at fifth month post-grafting. 4. Rete ridges showed its appearance at fourth week post-grafting and showed a normal appearance at fifth month post-grafting. 5. Fine structures of epidermo-graft bed junction showed a discontinuous appearance at second week post-grafting and showed a normal continuous appearance at fifth month post-grafting. In summary, the 'take' of grafted epidermal sheets begins at fourth week post-grafting and completed at fifth month post-grafting.

SPHIT 알고리즘의 개선을 통한 JPEG2000 정지영상 부호화에서의 압축효율 개선

조상현,김성현,김진만,주동현,김두영 東亞大學校附設 情報技術硏究所 2004 情報技術硏究所論文誌 Vol.12 No.1

With the increasing use of multimedia technologies, image compression requires higher performance as well as new functionality. Specially, in the specific area of still image encoding, a new standard, JPEG2000 was developed. This paper proposed SPHIT Algorithm that uses a method to optimized selection of threshold from feature of wavelet transform coefficients and to removes sign bit in LL area on JPEG2000. Experimental results show the proposed algorithm achieves more improved bit rate.

체내동태 연구를 위한 혈청 중 펜톡시필린의 HPLC 정량법 개발 및 검증

조혜영,강현아,류희두,이화정,문재동,이용복 한국약제학회 2006 Journal of Pharmaceutical Investigation Vol.36 No.2

Ruled Surface로 형성된 임펠러 블레이드 전용 CAD/CAM 시스템 개발 Ⅰ : 모델링에 관한 연구 A Study on the Modeling

조현덕,정대일,윤문철,최두선,신보성,이응숙,董玉革 한국공작기계학회 2001 한국생산제조학회지 Vol.10 No.6

We have developed the exclusive CAD/CAM system for the machining of impeller blades. This study is about the modeling method for the effective machining of impeller blades formed by ruled surface. As the impeller is consisted of boss part and blade part, the boss is modeled by rotational surface of hub curve on z-axis and the blade is described by ruled-surfaces between hub curve and shroud curve. This modeling process can be carried out on the software developed in this study. And, the developed software can describe the impeller as a solid model through interface with Solid-Works software. The developed software containing the interface method proposed in this study was very effective for impeller modeling.

韓國女流漢詩選 考察 : 海東詩選을 中心으로 Centering on the Hae-dong Selected Poems

曺斗鉉 圓光大學校 1988 論文集 Vol.22 No.1

This thesis examined, appresciated, and criticized the content of poems according to the writers' status centering on the women's Chinese poems in Hae-dong Selected Poems editted by Cho Jang Seob, who is a scholar in the time of King Sunjo, the late Lee Dynasty. On the basis on it, this thesis arranged the general trends of women's poems in the social classes according to the periodical circumstances. Hae-dong Selected Poems is a vast garland, which colledts and records about 2,300 pieces of Chines poems of all levels of society from Shinla, Koryu to King Sunjo(the 23rd). Among them, 171 pieces are written by such ladies of dignitary as Shin-saim-dang, Heo-nanseolhun, Kisaengs as Hwang-jini, Lee-maechang, concubines, common country women, nuns, and maidservants and so on. The time when the women's Chinese poems are created is after the middle period of Lee Dynasty in 16th century. The periodical circumstances and the women's status are as follows. The society was furbulent and the people's lives are poor because of the political changes and war. But on the contrary, in the aspect of culture, Hangeul culture was developed greatly after the creation of Hunminjeongeum, and Chinese classics were developed by way of the continuance of classical examination system and the participation of the common people who awoke the self-consciousness through Hangeul. In those days women were neglected in the social role as a human being and stick at the household labor and waining on men because not only of the dominant social common idea of the predominance of men over women but the lack of education. After the consonderation on the Chinese poems which is left by women poets in their own positions and the phases of those times, the result are as follows. 1. The works of the ladies of dignitary speak for the women's difficulties of that time through the ethical and human sorrows and sufferings such as filial duty, ancestor worship, solitude in their husbands absences and appreciation of nature. 2. The works of kisaeng express the joys and sorrows of their lives, emotions of love and separation well depending on the nature. 3. The works of concubines are similar to those of kisaengs' in general, and are strongly express the desire to have entire possessio of her lover. 4. The Chinese poems of egneral country women are similar to those of ordinary life impressions such as instructive content as well as love, anxiety and appreciation of nature. 5. As a result of considering the nuns' and maidservants' Chinese poems, the number of poems are a few but worthy of being representative of their classes. The nuns wrote the self-sacrificial prayers of poems to save all creatures, but maidservants expressed the conflicts between classes of the times that they couldn't love their own ways because of their status. The facts that were found as a result of considering women's Chinese poems on the basis of their classes are the merits of Korean women: they maintained the beauty, human sincerity and social capacity as women in the worst case of self-contempt and unconditional submission. These are the greatest pride and would be an initial manure to women and our culture today. We expect the rediscovery of their exellent life values through the profound study of our women's Chinese poems in future.

팔라디움 촉매하에서 산염화물과 유기주석의 커플링 반응

김두화,박정환,한도수,허선아,김성현,조성동 조선대학교 기초과학연구소 1992 自然科學硏究 Vol.15 No.1

The reaction of Asymmetrical organotins with acid chlorides in the presence of Benzylbis (triphenylphosphine) palladium(Ⅱ) chloride gave good yields of ketones in chloroform.

핵저지능이 열자극전류에 미치는 영향

邊大鉉,趙昌熙,韓斗敎 弘益大學校 1987 弘大論叢 Vol.19 No.2

In this study induced thermally stimulated current by the TSC was measured by the open circuit method after implanting Na+ ion into a PET film. With the result, using a new theory, activated energy, escape frequency, relaxation time and ion density was evaluated. (-) peak appeared at 363 K and 390 K when temperature increasing rate was 0.1 K/sec. and a (+) peak in the range 310~350 K. As a result of analysis, the peak at 363 K was by Na^(+) ion trapped in the surface trap and the activated energy 1. 14eV. 390 K peak had 1.66 eV activated energy and was by Na+ ion trapped in a vacance. The TSC current of 390 K peak was proportional to nuclear stopping power.

OVERSHOOT를 제거한 개선된 큐빅 스플라인 보간법에 관한 연구

김성현,김진만,조상현,주동현,김두영 東亞大學校附設情報技術硏究所 2005 情報技術硏究所論文誌 Vol.12 No.2

This study presents the improvement of cubic spline interpolation without overshoot. The o-riginal cubic spline interpolation has overshoots between two data. They are noises in still image zoom because of getting out of the pixel value. But the improvement of cubic spline in-terpolation removes them and proffers better quality still image than other interpolations.

법랑라세포종의 면역조직화학적 및 전자현미경적 연구

이두형,조성덕,양문호,장충현,박재훈 大韓成形外科學會 1993 Archives of Plastic Surgery Vol.20 No.3

Clinicopathologic analysis of ameloblastoma in 24 cases and their ultrastructural and immunohistochemical studies, especially to cytokeratin expressions according to morphologic classification were performed to clarify the tumor cell differentiation and origin. Reaction with broad spectrum and high molecular weight cytokeratin were generally positive in the stellate cell of the follicular and acanthomatous ameloblastoma, suggesting more squamous differentiation than peripheral basal cell type. Although ultrastructually common origin from oral epithelium was evidenced by presence of tonofilaments and desmosome, variations were prominent among the different histopathologic types of tumor. In granular cell ameloblastoma there were pleomorphic osmiophilic lysosome-like granules.