학생임원 선출 방법의 개선을 위한 모바일 전자투표 시스템

오필우,신수범,김명렬,Oh, Pill-Woo,Shin, Soo-Bum,Kim, Myeong-Ryeol 한국정보교육학회 2006 정보교육학회논문지 Vol.10 No.1

This paper is designed to search the new alternatives to supplement the inconvenience of the traditional written ballot method which is executed every early semester to select the class board at the school. It is prepared on the based the results of the design and implement of the wired/wireless inter-working mobile electronic voting system where the students can participate in the real-time class board selection and the decision-making utilizing the mobile phones, PDA and PC they commonly have. It is time when we should consider introducing the electronic voting system, to minimize the students' inconvenience and the subsequent missing class, having to wait in the long line in the designated place to select the class board at every election season. This system enables the students to participate wherever they are other than the common place as well. Further, this research will provide the opportunity to think over the new school election culture in line with the age of Ubiquitous, as well as the useful means in the field to promote the active participation of the parents and students in the students' self-administration, decision-making necessary at the schools.

미술 감상학습을 위한 웹기반 3D 시스템의 설계 및 구현

오필우,정상목,김명렬 한국정보교육학회 2005 정보교육학회논문지 Vol.9 No.4

7차 교육과정에서 추구하는 초등미술교육은 모든 학생이 화가가 되기를 바라는 것이 아니라 아름다움을 보고 느끼고 생활에 적용하여 보다 아름다운 생활을 가꾸어 갈 수 있는 심미적 인간 을 기르고자 하는 것이다. 즉, 감상활동의 중요성이 나타나 있다고 할 수 있다. 그러나 교육현장 특히 학원가를 중심으로 감상영역 보다는 테크닉 위주의 학습이 행해지고 있는 것이 현실이며 도서․벽지의 학생들이 갤러리와 같은 물리적 공간에서 감상학습을 한다는 것은 더욱이 어렵고, 기존의 감상 자료들이 텍스트 기반으로 소수의 학생들만이 공유할 수 있다는 단점을 해결하고자 본 논문에서는 인간 감각 형태와 가장 비슷하다고 할 수 있는 웹 기반의 3차원적 학습 패턴을 기본으로 하는 갤러리 형태의 감상 학습 자료를 제공하는 시스템을 설계 및 구현하였다. The art education in elementary schools pursued by the 7th education course is to nurture more aesthetic human who can live a more beautiful life by applying the beauty they felt and saw, rather than wishing all students to become artists. In other words, it emphasizes on the importance of appreciation activity. However, the reality is that technique-oriented learning is the main in the education field, especially around the academies, and appreciation learning is even more difficulty for students at physical spaces such as galleries who live inisland or distant countries. This study designs and materializes a system providing appreciation learning data in the form of gallery based on 3 dimensional learning pattern, which is similar to form of human senses, to solve the demerits of former appreciation resources being shared around a small number of students.

잣파종기고안시험

오필우 한국양묘협회 1983 韓國養苗協會誌 Vol.11 No.-

전자계산기구조 학습을 위한 ITS 학습자 모듈의 설계

오필우,김도윤,김명렬 한국컴퓨터교육학회 2005 컴퓨터교육학회 논문지 Vol.8 No.2

낙우송 (落羽松) ( Taxodium distichum Rich . ) 지재의 (枝材) 압축이상재 및 대응재에 관한 해부학적 특성

이필우(Phil Woo Lee),정연집(Youn Jib Chung),권미(Mi Kwon) 한국산림과학회 1991 한국산림과학회지 Vol.80 No.3

Compression wood and opposite wood formed in a branch of Taxodium distichum Rich. is described and compared in qualitative and quantitative anatomical aspects. The qualitative features of compression wood appeared to differ from those of opposite wood in very gradual tracheid transition from earlywood to latewood, roundish tracheid shape on cross surface, tracheid tip distortion on radial surface, and existence of intercellular spaces and helical cavities. In quantitative features, compression wood tracheids showed shorter lengths than opposite wood. The ray density and the number of uniseriate rays were greater in compression wood than in opposite wood but the height of uniseriate rays in compression wood was smaller than in opposite wood.

양버즘나무 ( Platanus occidentalis L . ) 팽장조직의 해부학적 특성

이필우(Phil Woo Lee),정연집(Youn Jib Chung) 한국산림과학회 1993 한국산림과학회지 Vol.82 No.1

The swollen tissue of wound origin formed after nailing c-shaped fastener to a stem of Platanus occidentalis L. was compared with normal tissue in the qualitative and quantitative anatomical aspects. The swollen tissue appeared to differ from normal tissue in irregular cell orientation, occurrence of tyloses in vessel element, less common appearance of pore multiples, narrower and shorter vessel element, lower vessel frequency, shorter and highly thick-walled wood fiber, greater number of bars per scalariform perforation plate in vessel element, larger ray frequency, larger ray width and lower ray height.

요소수지와 토난접착제 혼용이 합판의 접착력에 미치는 영향

이필우,박헌 한국목재공학회 1984 목재공학 Vol.12 No.1

Taro-UF mixed type resin system was developed for gluing plywoods. The taro adhesive that was activated with sodium hydroxide was mixed with the definite ratios of UF resin adhesive. At the sametime, wheat-UF mixed type resin was also applied with the same method as Taro-UF mixed type resin. The mixing ratios of taro or wheat adhesive: UF resin were 0:100, 10:90, 20:80, 30:70, 40:60, 50:50, 60:40, 80:20, and 100:0 by weight. In addition, the UF resins extended with wheat powder at the extending ratios of wheat powder UF resin, 10:90, 20:80, 30:70, 40:60, and 50:50 by weight, were also used. The dry and wet shear strengths of the plywoods of 30:70 (taro adhesive : UF resin) mixing ratio were highest.. The dry shear strengths of the plywoods manufactured with the UF resin-mixing taro adhesive were higher than those of the plywoods with the UF resin-mixing wheat adhesive at 10:90, 20:80, 30:70, 40:60, 50:50, and 60:40 (taro or wheat adhesive : UF resin) mixing ratios. At all mixing ratios, the wet shear strengths of the plywoods manufactured with the UF resin-mixing taro adhesive were higher than those of the plywoods with the UF resin-mixing wheat adhesive. The dry and wet shear strengths of the plywoods manufactured with the UF resin-mixing wheat adhesive were higher than those of the plywoods with the wheat powder-extending UF resin at the mixing ratios, 10:90, 20:80, 30:70, and 40:60 (wheat adhesive or wheat powder : UF resin). So. it was found that the plywoods manufactured with the UF resin-mixing taro adhesive and the UF resin-mixing wheat adhesive had better shear strength than the plywoods with the wheat powder-extending UF resin. It was because the taro adhesive and wheat adhesive themselves took the bonding properties after being activated with alkali.

요소 및 석탄산수지 (石炭酸樹脂) 합판의 토란증량에 (土卵增量) 관한 연구

이필우,배영수 ( Phil Woo Lee,Young Soo Bae ) 한국산림과학회 1982 한국산림과학회지 Vol.57 No.1

This study was carried out to examine the possibility to replace imported wheat flour with taro. Taro and wheat flour were used for the extenders after oven drying(100±3℃)and pulverized into 80-100mesh minute powder by laboratory willey mill. Urea- and phenol-fromaldehyde resin adhesives were used for plywood manufacture, and the extending materials mixed with the extension at the ratio of 10, 20, 30, and 50% to each resin solution. The results obtained at this study were summarized as follows; 1) In dry and wet shear strength of urea-formaldehyde resin adhesive, taro showed very excellent bonding strength compared with wheat flour in all extending ration. Therefore taro showed the possibility that be usable to taro in place of wheat flour 2) In dry and wet shear strength of phenol-formaldehyde resin adhesive, in general, wheat flour showed higher bonding strength than taro. But in dry shear strength, taro showed higher shear strength than wheat flour in 30 and 50% extension.

제지 슬러지 - 폴리프로필렌수지 복합재의 기계적 성질

이필우,손정일 한국목재공학회 1999 목재공학 Vol.27 No.3

The objective of this research is to develop paper sludge reinforced thermoplastic composites which incorporate the advantages of each component materials. The effects of paper sludge content(0, 10, 20, 30, 40%), mesh size(20∼40, 60∼80, less than 100mesh), and coupling agent(Epolene E-43 and Epolene G-3003) on the mechanical properties of paper sludge-polypropylene composites were investigated. Composite density increased with an increase in the paper sludge content. When paper sludge is incorporated into a polypropylene matrix, the flexural properties of the composite increase significantly with an increase in the paper sludge mixing ratio. Especially, flexural modulus was improved with increasing paper sludge content. The flexural strength of composites was improved, but flexural modulus reduced somewhat with decreasing paper sludge particle size. The flexural properties of paper sludge-polypropylene composites were improved by using coupling agents to enhance the bonding between reinforcing filler and matrix. Use of the epolene E-43 and G-3003 resulted in considerable improvement in the flexural strength over control specimens. The flexural strength of the G-3003 composite system is higher than that of the E-43 system. Generally, izod notched impact strength of paper sludge-polypropylene composite decreased slightly, whereas izod unnotched impact strength decreased significantly with increasing paper sludge contents. There was no effects of paper sludge particle size on impact strength of paper sludge-polypropylene composites. And izod unnotched impact strength of epolene E-43 composite system sharply decreased but that of G-3003 composite system was no tendency with increasing additive content.

제이인산 암모늄에 의한 합판의 내화처리 (Ⅰ) - 온냉침지처리와 (溫冷浸漬處理) 열판에 의한 처리합판의 재건조 -

이필우,정우양 ( Phil Woo Lee,Woo Yang Chung ) 한국산림과학회 1983 한국산림과학회지 Vol.60 No.1

Plywood, the representative interior decorative or structural material, is so inflammable that it may cause big fires. Therefore, it is required inevitably to manufacture the $quot;Fire retardant treated plywood$quot;, and it will be a study on the redrying of treated plywood that we ought to solve. This study was carried out to investigate the absorption of 20% (NH₄)₂HPO₄ solution into the soaked plywoods by hot/cold soaking for 3/3, 6/3, 9/3 and 12/3 hours and to study drying process with drying curves and drying rates by press-drying at the platen temperature of 130, 145, 160 and 175℃. Solution absorption of plywoods in hot/cold soaking method increased steadily with the prolonged soaking time, and water absorption is higher than DAP absorption, and then chemical retention (DAP) exceeded the minimum retention [ 1.125 Kg/(30㎝)³] even in the shortest soaking treatment. Drying curves of water-soaked plywoods inclined more steeply than those of DAP soaked plywoods. And the drying proceeded rapidly with the increase in platen temperature and terminated in 2.51 minutes at the temperature of 160 and 170℃. Drying rate also increased generally with the increase of platen temperature. So it was at 175℃ in DAP-soaking and at 160℃ in water-soaking when the drying rate became above 10%/min.