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목재공학 update

JOURNAL OF THE KOREAN WOOD SCIENCE AND TECHNOLOGY

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  • : 목재공업(~1979)→목재공학(1980~)

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수록범위 : 1권1호(1973)~45권6호(2017) |수록논문 수 : 2,177
목재공학
45권6호(2017년) 수록논문
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KCI등재 SCOPUS

1목재공학 45권 6호 표지 및 목차

저자 : 한국목재공학회

발행기관 : 한국목재공학회 간행물 : 목재공학 45권 6호 발행 연도 : 2017 페이지 : pp. 1-1 (1 pages)

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2Aims and Scope

저자 : 한국목재공학회

발행기관 : 한국목재공학회 간행물 : 목재공학 45권 6호 발행 연도 : 2017 페이지 : pp. 2-2 (1 pages)

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3Effect of Bark Content and Densification Temperature on The Properties of Oil Palm Trunk-Based Pellets

저자 : ( Nyoman J Wistara ) , ( Moh Arif Rohmatullah ) , ( Fauzi Febrianto ) , ( Gustan

발행기관 : 한국목재공학회 간행물 : 목재공학 45권 6호 발행 연도 : 2017 페이지 : pp. 671-681 (11 pages)

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Oil palm trunk (OPT) is a potential source of biomass for the production of biopellet. In the present research, biopellet were prepared from the meristem part of 25 years old OPT with various percentages of its bark (0, 10, and 30%). The highest biopellet durability was found for biopellet produced at 130℃ of pelletizing temper-ature with 30% bark content. Scanning electron microscopy (SEM) of biopellet showed the weak of particle bonding due to the low pelletizing pressure. The moisture content, unit density, ash content, and caloric value of OPT-based pellets were 3.55-5.35%, 525.56-855.23 kg/m3, 2.76-3.44%, and 17.89-19.14 MJ/kg, respectively. The combustion profiles obtained by thermogravimetric analysis (TGA) seemed to be unaffected by the bark content on. Differential thermal analysis of TGA curve indicated different pyrolysis characteristic of hemi-cellulose, cellulose, and lignin.

KCI등재 SCOPUS

4Essential Oil Analysis of Illicium anistum L. Extracts

저자 : ( Hee-jeong Min ) , ( Chan-soo Kim ) , ( Hwa-ja Hyun ) , ( Young-soo Bae )

발행기관 : 한국목재공학회 간행물 : 목재공학 45권 6호 발행 연도 : 2017 페이지 : pp. 682-688 (7 pages)

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Fresh japanese anise (Illicium anisatum L.) tree leaves were collected and ground after drying. The essential oils of the leaves were analyzed by gas chromatography-mass spectrometry (GC-MS) using headspace (HS) and solid phase-microextra (SPME) methods. Volatile components of the leaves were identified 21 and 65 components in HS and SPME, respectively. The main components of the essential oils obtained by HS method were eucalyptol (36.7%), (+)-sabinene (15.61%), δ-3-carene (6.87%), α-pinene (6.07%), γ-terpinen (5.72%), α-limonene (5.26%), β-myrcene (4.13%), α-terpinene (4.04%) and β-pinene (3.73%). The other components were less than 3.5%. SPME method also showed that eu-calyptol (17.88%) was main. The other were 5-allyl-1-methoxy-2 (13.29%), caryophyllene (6.09%), (+)-sabinene (5.60%), α-ocimene (4.89%) and β-myrcene (3.73%), and the rest were less amounts than 3.5%. This work in-dicated that many more volatile components were isolated, comparing to the previous literature data and that SPME method was much more effective than HS method in the analysis of the volatile components.

KCI등재 SCOPUS

5Bending Creep Property of Cross-Laminated Woods Made With Six Domestic Species

저자 : ( Jin-woong Byeon ) , ( Tae-ho Kim ) , ( Jae-kyung Yang ) , ( Hee-seop Byeon ) ,

발행기관 : 한국목재공학회 간행물 : 목재공학 45권 6호 발행 연도 : 2017 페이지 : pp. 689-702 (14 pages)

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In this study, with the view to using effectively small and medium diameter Korean domestic woods as struc-tural materials, cross-laminated woods were manufactured by using six species of Korean domestic softwoods and hardwoods, and bending creep properties were investigated for each species. The creep curves showed the shape of the exponential function plot, and the creep curves after 1 hour were able to estimate by fitting it to the power law. The initial and creep compliances of cross-laminated woods showed the higher values in wood species with a low density than in that with a high density. And by cross-laminating, the initial and creep com-pliances perpendicular to the grain considerably decreased, the extent of the decrease was found to be greater in creep deformation than in initial deformation. The creep anisotropies of cross-laminated woods were consid-erably decreased by cross-laminating. The relative creep of C type composed of perpendicular-direction lamina in the faces decreased 0.59 - 0.64 times compared to that of P type composed of perpendicular-direction lami-nae in all layers, and that for C type composed of parallel-direction laminae in the faces increased 1.5 - 1.6 times compared to that of P type composed of parallel-direction laminae in all layers.

KCI등재 SCOPUS

6Effect of Process Parameters and Kraft Lignin Additive on The Mechanical Properties of Miscanthus Pellets

저자 : ( Chang Ha Min ) , ( Byung Hwan Um )

발행기관 : 한국목재공학회 간행물 : 목재공학 45권 6호 발행 연도 : 2017 페이지 : pp. 703-719 (17 pages)

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Miscanthus had a higher lignin content (19.5 wt%) and carbohydrate (67.6 wt%) than other herbaceous crops, resulting in higher pellet strength and positive effect on combustion. However, miscanthus also contains a high amount of hydrophobic waxes on its outer surface, cuticula, which limits the pellet quality. The glass transition of lignin and cuticula were related to forming inter-particle bonding, which determined mechanical properties of pellet. To determine the effects of surface waxes, both on the pelletizing process and the pellet strength were compared with raw and extracted samples through solvent extraction. In addition, to clarify the relationship between pellet process parameters and bonding mechanisms, the particle size and temperature are varied while maintaining the moisture content of the materials and the die pressure at constant values. Furthermore, kraft lignin was employed to determine the effect of kraft lignin as an additive in the pellets. As results, the removal of cuticula through ethanol extractions improved the mechanical properties of the pellet by the formation of strong inter-particle interactions. Interestingly, the presence of lignin in miscanthus improves its mechanical properties and decreases friction against the inner die at temperatures above the glass transition temperature (Tg) of lignin. Consequently, it could found that the use of kraft lignin as an additive in pellet reduced friction in the inner die upon reaching its glass transition temperature.

KCI등재 SCOPUS

7Effect of Proanthocyanidin-rich Extracts from Pinus radiata Bark on Termite Feeding Deterrence

저자 : ( Sung Phil Mun ) , ( Darrel D. Nicholas )

발행기관 : 한국목재공학회 간행물 : 목재공학 45권 6호 발행 연도 : 2017 페이지 : pp. 720-727 (8 pages)

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Antioxidants are known to affect the feeding habits of termites and a good source is pine bark which con-tains high levels of antioxidants which can be extracted with neutral solvents. In this study procyanidins (PCs)-rich MeOH-extract and a hot-water extract (HWE) were prepared from Pinus radiata bark. HWE was further separated into crude PCs (CPCs), polymeric PCs (PPCs), and low-molecular-weight PCs (LMWPCs) fractions. The MeOH extract and these fractions were examined for termite (Reticulitermes flavipes Kollar) an-tifeedant activities using a no-choice test. Catechin was used as a positive control. The LMWPCs was found to be the most effective deterrent to termite feeding. The comparative efficiency of the compounds tested were LMWPCs > PPCs > CPCs > MeOH extract, with the latter being more dependent on molecular weight than on its antioxidant activity.

KCI등재 SCOPUS

8Bending Behavior of Nailed-Jointed Cross-Laminated Timber Loaded Perpendicular to Plane

저자 : ( Sung-jun Pang ) , ( Kwang-mo Kim ) , ( Sun-hyang Park ) , ( Sang-joon Lee )

발행기관 : 한국목재공학회 간행물 : 목재공학 45권 6호 발행 연도 : 2017 페이지 : pp. 728-736 (9 pages)

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In this study, the bending behavior of cross-laminated timber (CLT) connected by nails were investigated. Especially, the load-carrying capacity of the nail-jointed CLT under out-of-plane bending was predicted by the lateral resistance of the used nails. Three-layer nail-jointed CLT specimens and a nail connection were manufac-tured by 30 mm (thickness) × 100 mm (width) domestic species (Pinus koraiensis) laminas and ø3.15 × 82 mm nails using a nail-gun. Shear test for evaluating the nail lateral resistance and bending test for evaluating the load-carrying capacity of the nail-jointed CLT under out-of-plane bending were carried out. As a result, two lateral resistance of the used nail, the 5% fastener offset value and the maximum value, were 913 N and 1,534 N, respectively. The predicted load-carrying capacity of the nail-jointed CLT by the 5% offset nail lateral resist-ance was similar to the yield points on the actual load-displacement curve of the nail-jointed CLT specimens. Meanwhile, the nail-jointed CLT specimens were not failed until the tension failure of the bottom laminas oc-curred beyond the maximum lateral resistance of the nails. Thus, the measured maximum load carrying capacities of the nail-jointed CLT specimens, approximately 12,865 N, were higher than the predicted values, 7,986 N, by the maximum nail lateral resistance. This indicates that the predicted load-carrying capacity can be used for designing a structural unit such as floor, wall and roof able to support vertical loads in a viewpoint of pre-dicting the actual capacities more safely.

KCI등재 SCOPUS

9Changes of Micro- and Nanoscopic Morphology of Various Bioresources by Different Milling Systems

저자 : ( Jae-hyuk Jang ) , ( Seung-hwan Lee ) , ( Min Lee ) , ( Sang-min Lee ) , ( Nam-

발행기관 : 한국목재공학회 간행물 : 목재공학 45권 6호 발행 연도 : 2017 페이지 : pp. 737-745 (9 pages)

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This study was carried out to investigate the changes in micro- and nanoscopic morphology of cellulose nano-fibrils (CNFs) from various bioresources by investigating various mechanical milling systems. Mechanical mill-ing in herbaceous bioresources was more effective than in woody bioresources, demonstrating lower energy con-sumption and finer morphology. The milling time to reach nanoscopic size was longer in woody bioresources than in herbaceous bioresources. Furthermore, at the same level of wet disk milling time, CNFs from herba-ceous bioresources showed more slender morphology than those from woody bioresources. Tensile properties of nanopaper prepared from CNFs of herbaceous bioresources were higher than those of woody bioresources. The highest tensile strength was found to be 77.4 MPa in the nanopaper from Evening prim rose.

KCI등재 SCOPUS

10End Distance of Single-shear Screw Connection in Cross Laminated Timber

저자 : ( Jung-kwon Oh ) , ( Gwang-chul Kim ) , ( Kwang-mo Kim ) , ( Jun-jae Lee ) , ( J

발행기관 : 한국목재공학회 간행물 : 목재공학 45권 6호 발행 연도 : 2017 페이지 : pp. 746-752 (7 pages)

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Cross-laminated timber (CLT) is a relatively new engineered wood for timber construction. It is a great shear wall material. It was known that the shear performance of the CLT wall depends on the performance of connections. In connection, nail or screw has to be installed with a certain distance from the end of the timber. Current building code specifies the distance on the name of end distance. The end distance was decided as a minimum distance not to make splitting or tearing out in lumber or glued laminated timber. As a relatively new engineered wood, the end distance of CLT connection need to be identified because CLT is cross-wisely glued lumber products like plywood. Different from glued laminated timber or lumber, cross layer of CLT may pre-vent wood from splitting or tearing-out. As a result, the end distance of CLT was expected to be reduced than glued laminated timber. The shorter end distance may let more versatile connector design possible. In this study, prior to developing novel connection for CLT, the end distance of CLT connection was experimentally inves-tigated to identify the end distance limitation. The experiments showed that the end distance can be reduced from 7D to 6D, in case of the tested CLT combination and screw in this study.

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