Diamond tools with several layers of diamond grits through thickness direction were tested by sawing. The saw blades with evenly distributed grits showed better cutting performance compared to the random distributed saw. At a given concentration of grits, as the spacing between layers was increased, the cutting performance was improved, and as decreased, it showed more tool life

수학적 명제들을 사용하는 수학교육용 게임의 학습 도움말이나 안내말은 그래픽 우선 인지스타일을 가진 게임세대의 학습자를 위해 그래픽적인 형태로 표현하는 것이 필요하다. 본 논문에서는 수학 명제들에 대한 객체 기반 비주얼적 표현방법을 제안하였다. 이 표현방법은 단어들과 함께 그래픽적 기호들과 수학적 기호들 사용하여 객체 기반적인 표현방법의 규칙을 갖고 있다. 그래서 수학적 의미를 정확하게 표현하거나 이해하기가 쉽다. 그리고 학습자가 내용을 빠르게 읽을 수 있다. 제안된 방법은 게임 세대 학습자들에게 교육용 게임을 통해 수학 학습의 스캐폴딩으로써 도움을 받기가 좋다.

The aim of this field experiment was to investigate the possible effects of mepiquat chloride (TE) and trinexapac-ethyl (MC) on oil composition, seed yield and endogenous gibberellins content of flax cultivar. Foliar application of plant growth retardants mepiquat chloride (0.897, 1.794 and 2.691 kg a.i. ha-1) and trinexapac-ethyl (0.756, 1.512 and 2.668 kg a.i. ha-1) had significantly increased seeds ripening rate and seed yield. In contrast, plant height was decreased by foliar application of MC and TE. The application of MC significantly increased seed oil yield (730 kg ha-1 by 27.0%) compared to the control. Seed and oil yield, and unsaturated fatty acids (oleic acid, linoleic acid and linolenic acid) were increased by foliar application of MC.