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원경록,유병오,이광수,정수영,종송호,변희섭 경상대학교 농업생명과학연구원 2013 농업생명과학연구 Vol.47 No.6
Nondestructive evaluation (NDE) technique method using a resonance frequency by free vibration mode was carried out for damaged and sound wood of black pine woods( Pinus thunbergii ) by Matstucoccus thunbergianae in order to utilize damaged trees. There were a close relationship of dynamic modulus of elasticity and static bending modulus of elasticity to MOR. It was found that there were a high correlation at 1% level between dynamic modulus of elasticity and MOR, and static modulus of elasticity and MOR in all conditions. However, the result indicated that correlation coefficient is higher in dynamic modulus of elasticity to MOR than that in static modulus of elasticity to MOR. Therefore, the dynamic modulus of elasticity using resonance frequency by free vibration mode is more useful as a nondestructive evaluation method for predicting the MOR of sound and damaged woods by Matstucoccus thunbergianae.
Nondestructive Evaluation of Strength Property for Heat-Treated Wood Using Free Vibration Mode
원경록,홍남의,강상욱,변희섭 경상대학교 농업생명과학연구원 2013 농업생명과학연구 Vol.47 No.4
Nondestructive evaluation (NDE) technique method using a resonance frequency by free vibration mode was carried out for heat treatment wood produced under different conditions. The effect of heat treatment on the bending strength and NDE technique using the resonance frequency by free vibration mode of wood for Korean paulownia, Pinus densiflora, Lidiodendron tulipifera and Betula costata were measured. The heat treatment temperature has been investigated at 175℃ and 200℃, respectively.
원경록,정수영,유병오,장용기,조장훈,변희섭 경상대학교 농업생명과학연구원 2017 농업생명과학연구 Vol.51 No.6
In order to utilize evergreen broad-leaved trees growing in warm temperate forests, weanalyzed the anatomical, physical and mechanical properties of Neolitsea sericea. The height,width, and number of biseriate ray and vessel diameter of earlywood and latewood wereobserved. The oven dry shrinkage of the Neolitsea sericea was 11.00% in the tangentialdirection and 4.64% in the radial direction. The air-dried shrinkage of the Neolitsea sericea was8.00% in the tangential direction and 2.88% in the radial direction. The physical properties weremeasured as mean annual ring width 2.93 mm, air-dried density 0.52 g/cm3, and basic density0.39 g/cm3, and mechanical properties were measured for bending strength 76.97 Mpa,compressive strength 10.97 Mpa, and shear strength 10.13 Mpa. There were close relationshipsat 1% of mechanical properties to annual ring width for Neolitsea sericea. As the averageannual ring width of Neolitsea sericea increased, the strength reduction was relatively low. It isconsidered that the use of large-diameter log is economical because the negative effects of theincreased growth rate on timber quality is low. These results brought a conclusion that Neolitseasericea in southern region could be useful forest resources for the utilization of wood. 난대림에서 생육하고 있는 상록활엽수를 자원화하기 위해서 참식나무의 조직적, 물리적, 역학적 특성을 분석하였다. 조직적 특성은 방사조직의 크기, 너비, 수와 도관의 크기를 관찰하였다. 참식나무의 전수축률은 접선방향 11.00%, 방사방향 4.64%를 나타내었고 기건수축률은 접선방향 8.00%, 방사방향2.88%를 나타내었다. 평균연륜폭은 2.93mm, 기건밀도는 0.52g/cm3, 기본밀도는 0.39g/cm3이었다. 휨강도는 76.97Mpa, 압축강도는 10.97Mpa, 전단강도는 10.13Mpa이었다. 참식나무의 평균연륜폭과 강도와의 관계는 1% 수준에서 유의성이 인정되는 부의 상관관계가 나타났다. 참식나무는 평균연륜폭의 높은증가에 반해 강도 감소율은 비교적 낮은 감소를 나타내어 생장률 증가에 따른 강도 감소가 낮아 대경재의 이용이 경제적이라고 판단된다. 남부지역의 참식나무는 온대에서 난대로 기후가 변화하는 난대 지역의 산림자원으로 본 목재재질특성 분석결과 유용한 산림자원으로 활용할 수 있을 것으로 생각된다.
원경록,정수영,홍남의,장용기,조장훈,변희섭 경상대학교 농업생명과학연구원 2017 농업생명과학연구 Vol.51 No.3
본 연구는 목초액 침지처리 활엽수의 심·변재 구분에 따른 내후성 효과를 평가하기 위하여 실시하였 다. 졸참나무, 구실잣밤나무, 백합나무를 심재와 변재로 구분한 시험편을 목초액에 96시간 동안 침지시 킨 후 백색 부후균을 사용하여 활엽수 심재와 변재의 내후성을 조사하였다. 침지처리 후 모든 조건에서 목재의 중량과 밀도가 약간 증가하는 경향을 나타내었다. 부후처리 후 목초액 침지처리를 한 시험편에 서 낮은 중량감소율이 나타났다. 수종별 비교에서 구실잣밤나무의 침지처리 심재에서 가장 낮은 중량감 소가 나타났다. 목초액을 이용한 침지처리법은 백색 부후균에 의한 목재의 부후저항을 효과적으로 증가 시켰다. This study was conducted to evaluate the resistance of wood to decay caused by fungi for sapwood and heartwood of three deciduous tree species, Quercus serrata, Castanopsis cuspidata, and Liriodendron tulipifera. Wood samples were immersed for 96 h in pyroligneous liquor. Then, the white-rot fungus, was used to examine the decay resistance of hardwood. Weight and density of wood from the all conditions increased after immersion treatment. Weight loss after decay resistance test was also dropped with a immersion treatment. The lowest weight loss indicated at immersion-treated heartwood of C. cuspidata. Immersion treatment using pyroligneous liquor effectively increased the resistance of wood to decay caused by fungi. Therefore, these findings are expected to be useful as fundamental data for the implementation of practices for silviculture practices of these species for timber production.