• The monthly packaging world
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• s.191
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• pp.106-123
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• 2009

국립식물검역원이 수출입화물목재포장재 검역요령(안)을 발표했다. 이는 식물방역법 개정에 따라 수입화물의 목재포장재 검역요령(식물검역원 고시 2006-14호)과 수출화물의 목재포장재검역요령(식물검염원 고시 2006-8호)을 통합하여 민원인의 편의를 증진하고 검역관이 활용하기 편하도록 하는데 목적이 있다. 이번 법안은 현행 목재포장재검역요령 중에서 국제기준과 현실에 맞지 않거나 일선 검역관 및 업체에서 개선을 요구한 사항을 반영했고, 이해하기 쉽도록 산재되어 있거나 중복된 내용을 간결하게 하고 "열처리업체운영정보시스템"구축에 맞게 서식 등을 정비했다. 본 고에서는 검역요령 법안과 함께 소독처리마크와 마크표지 방법 등에 대해 살펴본다.

• Proceedings of the Korea Electromagnetic Engineering Society Conference
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• 2001.11a
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• pp.291-295
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• 2001

지하탐사 레이더를 이용한 고 건축물의 목재 기등에 대한 비파괴 검사에 응용 가능성을 조사하였다. 실험실에 공동이 존재하는 목재 기둥을 마련하고, 자체 설계 및 제작한 안테나로 구성한 지하탐사 레이더 시스템을 이용하여 기둥 축 방향으로 안테나를 이동시키면서 펄스의 송수신 특성을 측정하였다. 측정에 사용한 펄스와 목재 기둥의 전기적 특성, 안테나, 급전선 등 레이더 시스템 전체를 3차원 FDTD로 모델링하였다. 측정과 동일한 상황에 대한 FDTD 해석결과와 측정자료가 부합됨을 입증하였다. 목재 기둥과 공동간의 낮은 유전율 차이도 쉽게 탐지할 수 있음을 보임으로써 향후 지하탐사 레이더를 고건축물의 비파괴 검사에 효과적으로 응용할 수 있음을 제시하였다.

• Journal of Energy Engineering
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• v.23 no.3
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• pp.211-220
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• 2014

This study reports the formation characteristics of tar, ash and clinker due to a wood pellet grade and the performance analysis of wood pellet boiler in terms of the moisture contents change of the wood pellet. Tar was accumulated on the heating surface according to combustion of wood pellet, the ash was yielded on the floor of combustion chamber in a wood pellet boiler and the clinker was solidified at the burner due to combustion of the 3rd grade wood pellet. Especially, the moisture contents is important factor to define the grade. Wood of logging residues has a non-uniform moisture contents after the field process, yields of tar, ash and clinker are increased in case of combustion due to the high ash contents. For these reasons, emission of harmful compounds in the exhaust gas, decrease of boiler efficiency and the system operating errors are observed. In the performance analysis of wood pellet boiler in terms of the moisture contents change of the 1st grade wood pellet, the boiler efficiency was reduced by 27.08% with 6.6% moisture contents increase. The optimum moisture contents of wood pellet is needed to improve the boiler performance and efficiency.

• Journal of the Korean Wood Science and Technology
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• v.41 no.3
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• pp.258-268
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• 2013

Wood-based products market is new growth engine industry of "Green growth policy". Korean government established a law, sustainable use of wood, for expanding wood and wood-based products market in 2012. This study was conducted to seek sustainable measures for conservation and management of valuable natural resources, offer expanding quality assurance services for wood-based products, and explore measures for expanding wood-based products labeling system. Through discussed domestic and overseas trends and literatures that concern wood-based products labeling system and investigated case studies that were presently operational. For expanding quality assurance services of wood-based products, Korea Forest Service operates a wood-based products labeling system in integrated management through variety awareness and specialist assessment for each product. This process will make enhanced wood-based products labeling system expanded gradually. To evolve into $3^{rd}$ party quality assurance services on maturity age of labeling system, public communication will help improve awareness of producer and consumer. appropriate incentive program will attract voluntary participation from woodbased product industry. Producers consider environmental ethics in their business and consumer should exercise their right to know.

• Journal of the Korean Wood Science and Technology
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• v.18 no.4
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• pp.3-8
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• 1990

근년에 전세계에서 목재건조 기술의 주요 관심사는 첫째 건조응력발생과 건조결함 예방이고, 다음은 건조실 제어시스템, 건조스케줄개발, 목재수분이동, 함수율측정, 새로운 건조방법개발, 건조에너지 절약, 경제성분석, 태양열건조, 수학적모델링, 건조전처리, 마이크로웨이브 건조, 건조실 구성과 정비, 건조종기결정, 감압건조, 공정제어와 콘다숀닝, 제습건조, 목재치수 안정 및 고온건조 등의 순위이다. 건조중 발생하는 결함들은 건조경비 증가에 절대적인 영향을 끼칠 수 있다. 예를 들면, 가구공장에 있어서 건조재의 품등 향상에 따른 1%의 수율 증대 효과는 가구 부품 1000 보오드피트당 23$의 생산비를 절감할 수 있고, 활엽수재의 천연건조시 수반되는 건조손상은 생재의 23%를 초과할 수 있다. 본 총설이 각종 문제를 개선하고 건조경비를 절감하는데 기여할 수 있기를 바라며, 또한 단판, 칩 또는 땔감과 같은 비제재품에 관한 건조에 관한것은 제외하였다.

• Journal of Korean Society of Forest Science
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• v.110 no.2
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• pp.217-232
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• 2021

This study calculated the productivity and cost of extraction and processing of logging residues by cut-to-length (CTL) and whole-tree (WT) harvesting methods. In addition, the comparative analysis of the characteristics of wood chip fuel to examine whether it was suitable for the fuel conditions of the energy facility. In the harvesting and processing system to produce the wood chips of logging residues the system productivity and cost of the CTL harvesting system were 1.6 Gwt/SMH and 89,865 won/Gwt, respectively. The productivity and cost of the WT harvesting system were 2.9 Gwt/SMH and 72,974 won/Gwt, respectively. The WT harvesting productivity increased 1.3times while harvesting cost decreased by 18.7% compared to the CTL harvesting system. The logging residues of wood chips were not suitable for CTL wood chips based on International Organization for Standardization (ISO 17225-4:2021) and South Korea standard (NIFoS, 2020), but the quality (A2, Second class) was improved through screening operation. The WT-unscreened wood chips conformed to NIFoS standard (second class) and did not conform to ISO but were improved through screening operation (Second class). In addition to the energy facility in plant A, all wood chips except CTL-unscreened wood chips were available through drying processing. The WT-unscreened wood chips were the lowest at 99,408 won/Gwt. Plants B, C, and D had higher moisture content than plant A, so WT-unscreened wood chips without drying processing were the lowest at 57,204 won/Gwt. Therefore, the production of logging residues should improve with operation methods that improve the quality of wood chips required for applying the variable biomass and energy facility.

• Journal of Advanced Marine Engineering and Technology
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• v.40 no.4
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• pp.307-313
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• 2016

When liquefied natural gas (LNG) is stored in a tank, it is necessary to maintain low temperature. It is very important that insulation techniques are applied to the LNG cargo because of this extreme environment. Hence, laminated wood, especially plywood, is widely used as the structural member and insulation material in LNG cargo containment systems (CCS). However, fracture of plywood has been reported recently, owing to sloshing effect. Therefore, it is necessary to increase the strength of the structural member for solving the problem. In this study, compressed wood, which is used as a support in LNG independent type B tanks, was considered as a substitute for plywood. Compression and bending tests were performed on compressed wood under ambient and cryogenic temperatures to estimate the mechanical behaviors and fracture characteristics. In addition, the direction normal to the laminates surface was considered as an experimental variable. Finally, the feasibility of using compressed wood for an LNG CCS was evaluated from the test results.

• Journal of the Korean Wood Science and Technology
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• v.32 no.5
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• pp.66-74
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• 2004

Fire performance is the important criterion for evaluating of safety of wood structures which exposed to the standard fire condition. Endurance time and time-to-failure are used as the criteria for fire performance in many countries. Reliability analysis about wood floor system which exposed to fire was carried out as preliminary research for reliability-based design on fire. Analyses were conducted by two methods, numerical analysis method and deterministic method.. They didn't show the difference between two methods. The reliability of floor exposed to fire showed strong dependence on the coefficient of variation of member and did not be influenced by the strength or load of member.

• Journal of Korean Association for Spatial Structures
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• v.6 no.2 s.20
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• pp.7-12
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• 2006

최근 환경문제에 대한 해결책으로 목조건물의 해체 및 목재의 재사용에 대한 관심이 높아지고 있다. 목조건물을 접합철물에 의해서 접합할 경우에는 건물의 해체시에 철재를 사용하지 않아 목부재의 절단이 매우 용이하고 목재의 재사용이 용이하도록 하는 장점을 가지고 있다. 대나무의 높은 인성은 목재 접합부의 강도와 안정성 확보를 가능하게 해주고 있다. 대나무 접합물은 2005년 일본 Aichi 세계박람회에서 Japan pavilion Nagakute 전시관 건물이 대나무 접합부를 사용한 목조건물이다.

• Journal of the Korean Wood Science and Technology
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• v.34 no.1
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• pp.15-22
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• 2006

ln order to manage efficiently many ancient wooden buildings, which have been preserved as cultural properties in Korea, the internal state of wood members should be evaluated exactly and periodically by a NDE (non-destructive evaluation) method. A research project was planned to develop an X-ray CT (computed tomography) system as a NDE method for wood, which could be easily applied in field. This paper includes the first part of this project. First of all, to establish a measuring procedure of wood density using X-ray radiography, the correlation between X-ray intensity and the film brightness was evaluated. Also, initial X-ray intensity was quantified with various radiate conditions controlled by the tube voltage and tube current. And then, the effects of density, annual ring angle, and thickness on the mass attenuation coefficient of wood were examined. Finally, Beer's law was modified with the above results and adopted to calculate the density of wood. As a result of this study, the measuring procedure of wood density was established using a portable soft X-ray device and this procedure was verified with some small wood specimens. This results will he used valuably for the following researches to develop a portable X-ray CT system.