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- 저자 : 강석구(Seog Goo Kang) (검색결과 41 건)
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강석구 ( Seog Goo Kang ),이화형 ( Hwa Hyoung Lee ) 한국목재공학회 2011 목재공학 Vol.39 No.1
This research was carried out to examine the ultrasonic properties of Phyllostachys bambusoids Sieb et Zucc depending on three directions for providing the fundamental properties of the Korea traditional flute, Daekeum. The ultrasonic properties of Phyllostachys bambusoides Sieb. et Zucc were found to be different from those of wood, because of the distinctive anatomical structure of bamboo tissue. The ultrasonic velocity of peripheral zone showed higher values of all three directions. The ratio of longitudinal velocities to perpendicular velocities showed 116 at peripheral zone, 170 at central zone, 1.38 at inner zone respectively. The ratio of radial velocities to tangential velocities were measured as 1.286 at peripheral zone, 1325 at central zone, 0.829 at inner zone respectively.
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강석구 ( Seog Goo Kang ),이화형 ( Hwa Hyoung Lee ) 한국목재공학회 2011 목재공학 Vol.39 No.1
This study was carried out to examine properties of water resistant plywood by using serum protein adhesive which is natural environment-friendly and human-friendly. For the preparation of the serum protein adhesive, pig blood from slaughterhouse was centrifuged and serum was separated from corpuscles and concentrated to 30% by dry weight basis This concentrated serum protein was modified with PF resin(50% NVC) with the ratio of 9:2.5. Plywood made by this modified serum protein gave 1.21 N/mm2 of dry bonding strength, 0.80N/mm2 of wet boil bonding strength, 0% of cyclic delamination test value, and 0.025ppm of HCHO emission, which met the excellent super Eo grade and water resistant plywood.
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반탄화 목분과 폐활성탄 혼합물의 복합연료활용을 위한 연료적 특성에 관한 연구
이창구 ( Chang Goo Lee ),강석구 ( Seog Goo Kang ) 한국목재공학회 2015 목재공학 Vol.43 No.1
This study evaluated fuel properties of composite materials which were prepared by mixing a waste activated carbon from the used purifier filter with torrefied wood powder. Wood species of the raw material of torrefied wood powder are oak wood (Quercus serrata Thunb. ex Murray) and pine wood (Pinus densiflora Siebold & Zucc). And the treatment conditions used for this study were 300 s, 450 s, and 600 s at 200℃ for the wood roaster. Also, the mixing ratios are 5 : 95, 10 : 90, 15 : 85, 20 : 80, 40 : 60, 60 : 40 and 80 : 20 (waste activated carbon : torrefied wood powder). The fuel properties such as highly heating value (HHV), elementary analysis and ash content were evaluated. The results obtained are followings; 1. Despite the same treatment condition of wood roasting, pine wood has higher carbon contents than oak wood. Therefore, pine wood indicated the optimum carbonization at low temperature and short treatment times. 2. The gross calorific value and ash content increased as the mixing ratio of waste activated carbon increased. 3. Mixtures of the waste activated carbon and torrefied wood powder showed greater gross calorific value than those of the mixtures of waste activated carbon and the untreated wood powder. Also, the pine wood resulted in higher heating value that thaose of the oak wood. 4. When composite fuels that were composed waste activate carbon and wood powder are used, higher temperature conditions are required because the combustion is incomplete at 800℃ and 4 hours. 5. The increasing rate of the gross calorific value of mixtures of waste activated carbon and untreated wood powder is higher than does the mixtures of waste activated carbon and torrefied wood powder. Also, this phenomenon is more obvious for pine woods. Therefore, an optimal mixing ratio of waste activated carbon was determined to be between 5% and 10% (wt%). Also, this condition satisfied the requirement of the No.1 grade of wood pellet.
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버섯 폐배지의 연료화 및 품질개선을 위한 반탄화 최적화 연구
이창구 ( Chang-goo Lee ),최병훈 ( Byeong-hoon Choi ),구영모 ( Yeong-mo Koo ),강석구 ( Seog-goo Kang ) 한국목재공학회 2022 한국목재공학회 학술발표논문집 Vol.2022 No.2
This study was conducted as part of the purpose of realizing the fuelization and quality improvement using spent mushroom substrate through a torrefaction pretreatment. Conditions of torrefaction pretreatment were performed at temperatures of 250, 350, and 450°C and reaction times of 600, 1,200, and 1,800s, respectively. In order to confirm the fuel characteristics were conducted to proximate analysis and higher heating value. As the experimental materials, to determine the tendency of spent mushroom substrate according to the cultivation period of Letinula edodes, the products discarded after harvesting 2, 4, 6 and 8 cycles were used. As a result, higher heating value and content of fixed carbon has been increased and contents of moisture content and ash has been decreased the more torrefaction pretreatment for temperature and time increased. Furthermore, the results of calculating the energy yield through the higher heating value and the mass yield, it found that most suitable for molded charcoal of the manufacturing a conditions of 1,200-1,800s of 350°C in this study.
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Wood paste 수처리 하수슬러지와 상토 혼합 비율에 따른 상추 생육 및 토양 중금속 함량 비교
양승민 ( Seung-min Yang ),강석구 ( Seog-goo Kang ) 한국목재공학회 2022 한국목재공학회 학술발표논문집 Vol.2022 No.2
Poly aluminum chloride used in the sewage treatment plants is a significant source of aluminum ions in water. Accordingly, the wood paste prepared by mixing wood, and eco-friendly water treatment agent, and cationic polymer was developed. The sewage sludge discharged after the use of wood paste water treatment agent also needs to be explored for recycling. Soil was prepared with addition of 1, 5, 10, and 30% sewage sludge. The effects on growth and heavy metal content in soil were compared with lettuce was grown. Sewage sludge added showed no significant difference in plant growth, but the total chlorophyll content, an important factor in photosynthesis, and soil pH increased. Sodium and potassium (soil-displacing ions) decreased as the amount of sludge added increased. Total nitrogen and effective phosphoric acid, increased 2.5 and 2.3 times compared to the control when 30% of sludge was added. The heavy metal content also increased with the increase in the amount of sludge added. Through this study, it was confirmed that the plant growth could be improved by wood paste water treatment of soil. However, additional clarification is needed on the effect of different amounts of heavy metals in soils on lettuce growth. On the other hand, the treatment can be applied to ornamental plants and perennial plants that are not consumed by humans.
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마루판용 합판의 단판 구성요소에 따른 변형 특성에 관한 연구
피덕원 ( Duck Won Pi ),강석구 ( Seog Goo Kang ) 한국목재공학회 2013 목재공학 Vol.41 No.1
Since 1990`s, a plywood for flooring base has gotten customers` demand. Costs of raw material and production increased because of changed environment of industry. Tropical timber such as Red Meranti (Shorea acuminate) used for raw material of the floor has been depleting beside countries in South Eastern Asia changed species of afforestation. As a result, it gets hard to secure good quality of raw material for plywood. Moreover plywood price is increased suddenly after earthquake in Japan. Eucalyptus (Eucalyptus globulus) in china has been using for raw material as a countermeasure of changed environment of industry. In this study, possibility of using flooring consisted of Eucalyptus veneer as crossband layers was checked by deflection experiments. Flooring consisted of Red Meranti was used for comparison. Two factors which impact on deflection are a type of density gradient and density difference between Long-grain veneer and Short-grain veneer. Red Meranti samples are M type of density gradient on the other hand Eucalyptus samples are W type of density gradient. The more samples have high density difference, the more deformation was checked. A sample which has big density difference between core and cross bands layer warp more also deform. Flooring was deformed smaller than plywood and samples which have big density difference was deformed more.
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