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Port Blair, India

Won K.-R.,Gyeongsang National University | Chong S.-H.,Forest Training Institute | Hong N.-E.,Gyeongsang National University | Kang S.-U.,Gyeongsang National University | Byeon H.-S.,Gyeongsang National University
Journal of the Korean Wood Science and Technology | Year: 2013

Nondestructive evaluation (NDE) technique method using a resonance frequency mode was carried out for heat-treated wood under different conditions. The effect of heat treatment on the bending strength and NDE technique using the resonance frequency by impact hammer and force transducer mode for Korean paulownia, Pinus densiflora, Lidiodendron tulipifera and Betula costata were measured. The heat treatment temperature has been investigated at 175°C and 200°C, respectively. There were a close relationship of dynamic modulus of elasticity and static bending modulus of elasticity to MOR. In all conditions, 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. 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 impact hammer mode is more useful as a nondestructive evaluation method for predicting the MOR of heat-treated wood under different temperature and species conditions. Source


Chong S.-H.,Forest Training Institute | Won K.-R.,Gyeongsang National University | Hong N.-E.,Gyeongsang National University | Park B.-S.,Korea Forestry Promotion Institute | And 2 more authors.
Journal of the Korean Wood Science and Technology | Year: 2014

The purpose of this study was to determine the effects of plantation thinning on physical and mechanical properties of Larix kaempferi. Tree samples were obtained from unthinned, moderately, heavily thinned plantations where located in Kwangryung forest research stand. The effects of different thinning methods on the bending and parallel to grain compressive strengths of Larix kaempferi were explored. Average latewood ratio with various thinning treatments revealed the trend of unthinning < moderate thinning < heavy thinning treatment. Average annual ring width with various thinning treatments showed the trend of unthinning < moderate thinning or heavy thinning treatment. Average bending and parallel to grain compressive strengths with various thinning treatments revealed the trend of unthinning > moderate thinning > heavy thinning treatment. This indicates that thinning treatment reduces average bending and parallel to grain compressive strength properties. Source


Alappatt J.P.,Forest Training Institute
Rheedea | Year: 2013

Bulbophyllum maxillare (Lindl.) Rchb.f. from the Andaman and Nicobar Islands is first reported to the orchid flora of India. A brief description with illustration and photograph is provided for easy identification. Source


Peristylus gracilis Blume (Orchidaceae) is reported here for the first time from Andaman & Nicobar Islands. A brief description with illustration and photographs is provided for easy identification. Source


Won K.-R.,Gyeongsang National University | Kim T.-H.,Gyeongsang National University | Hwang K.-K.,Gyeongsang National University | Chong S.-H.,Forest Training Institute | And 2 more authors.
Journal of the Korean Wood Science and Technology | Year: 2012

Heat treatment improves dimensional stability and sound absorption properties of wood. However, mechanical properties of wood can be deteriorated during the heat treatment. The effect of heat treatment on the bending strength and hardness of wood for Korean paulownia, Pinus densiflora, Lidiodendron tulipifera and Betula costata were measured. The heat treatment temperature has been investigated at 175°C and 200°C, respectively. The results showed that the weight and density of wood decreased after heat treatment. It was found that the density by heat treatment was lower at 200°C than that at 175°C. And, MOE increased with the reduced density. On the contrary, MOR and hardness decreased. In all conditions, It was found that there was a high correlation of 1% level between bending modulus of elasticity and modulus of rupture. Source

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