• Title/Summary/Keyword: round wood

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Strength Properties of Old Korean Larch Pile (고(古)부재 잎갈나무 말뚝의 재질 특성)

  • Hwang, Kweonhwan;Park, Byung-Su
    • Journal of the Korean Wood Science and Technology
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    • v.35 no.6
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    • pp.23-30
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    • 2007
  • Round piles of Korean larch were excavated from the foundation of ex-Chosunchongdokbu (ex-Chosun Governer-General Building), which was constructed in 1916 and dismantled later in 1996. By the record (Huh, 1996), the Korean larch logs were logged from the Yalu river area near Mt. Baekdu in North Korea. At present, however, Korean larch is not so popular in South Korea. The latewood ratio profiles and strength properties (longitudinal compression, shear, longitudinal tensile, and bending) were obtained. The ratio of latewood from pith to bark increased up to 25 years, and then it showed constant tendency at 40% with some variances. From the microscopic observation, however, the latewood ratio decreased from the heartwood to the sapwood. Compression strength was greater and bending strength was a little lower than the previous reports (references 13~15), which might be attributed to the strength reduction of old structural members by aging or damage in the compression specimens than the bending ones. The flat-grained specimens for the shear and tension test showed higher coefficient of variation (COV) than the edge-grained ones. For the better comparison of results, in case of shear and tensile strength tests, the strength values of the edge-grained specimens were thought to be adopted rather than those of flat-grained ones.

Formal characteristics of headdress in Chinese minorities (중국 소수민족 머리 장신구의 형태 특성)

  • Jiang, Yan;Jin, Shu;Lee, Younhee
    • The Research Journal of the Costume Culture
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    • v.28 no.3
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    • pp.356-375
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    • 2020
  • The purpose of this study is to understand the characteristics and cultural values of the headdress among Chinese minorities with diverse ethnic cultures, and to provide various data on the design of clothing accessories. Theoretical considerations about ethnic minorities were addressed through literature and prior research, with data being collected using literature and websites. The results are as follows. First, the most common type of headdress is the horizontal type, which includes the head style, headband, and head scarf. The second most common is the cylinder type, which is a headdress with variations in the shape of a round hat, and has is evident among various minorities. Third, the pagoda type is decorated with ornaments mounted on top of a round shape. Fourth, the square crown type is a piece of wood as a material for a form of the material and for a variety of jewelry and the production of up to meet the women's head of the jewelry. Fifth, head belt-type ornaments consist of a headband and fancy bead ornaments from the bottom of the head. Mongol women usually wear an exaggerated form of this type. Sixth, the head cover type is a head decoration influenced by the dress code of Muslim women. Seventh is the disc type of crown shape worn by the Dai. Next, the ogival type is a cone-shaped headdress hat most commonly seen as head ornament hat among the Dai. Lastly, the sailboat type is the most exaggerated form of hair ornaments found among ethnic minorities.

Study on the Shapes of Jung-kwa, Gi-kwa, Sin-kwa, Hyul-kwa (정기신혈과(精氣神血科)의 형상(形象)에 대한 연구)

  • Choi Byung-Tae;Choi Yung-Hyun;Baek Geun-Gi;Lee Yong-Tae
    • Journal of Physiology & Pathology in Korean Medicine
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    • v.19 no.5
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    • pp.1181-1190
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    • 2005
  • After study about the shapes of Jung, Gi, Sin, Hyul-kwa advocated by Master Jisan, the conclusions are drawn as follows. It pursues the rules of universe being changed from formless to concrete objects that the Body Essence, Vital energy, Mentality, and Blood are materialized to Jung, GE, Sin, Hyul-kwa. It can be drawn an inference from the next three theories that Jisan considered Jung, Gi, Sin, Hyul-kwa as round, square, reverse triangle, and triangle or oval shape. First, it was taken to following the shapes of viscera. Namely Jung-kwa was taken as Kidney, Gi-kwa as Lung, Sin-kwa as Heart, Hyul-kwa as Liver. Second, it was adopted from five kinds of constitutions according to the five elements in [Yeongchu Yin and Yang twenty five shapes] that is Jung-kwa is purchased with Water-earth phases, Gi-kwa with metal phase Sin-kwa with fire phase, Hyul-kwa with Wood phase, Third, it is taken in order to eliminate contradictions. Hyul-kwa disliking to move is assumed to round shape to easily move. Gi-kwa tending to disperse is chosen to square in order to be unmoved. Sin-kwa declining to stagnate of seven emotions is pursued to reverse triangle to compose oneself. Hyul-kwa inclining to gather is preferred to acreage phase to harmonize ascending tendency. Among shapes which Jisan was divided Hado, Nakseo, Bokhee pal kwoe, Moonwang pal kwoe, Jung-kwa as round is Hado, Gi-kwa as square is Nakseo, Sin-kwa as reverse triangle is Bokhee pal kwoe order shape, Hyul-kwa as acreage phase or oval shape is accord with Moonwang pal kwoe order shape. The reason being classified into Jung, GE, Sin, Hyul-kwa from the shapes of the face is that the face is the place to reflect the whole conditions of the body connected with all of the viscera and meridian system such as semen of plants. Above contents are drawn an inference from the transcription of Jisan's lectures and his writings. And it is considered that insufficient parts of the Jisan's theory must be demonstrated continuously.

Strength Properties of Wooden Retaining Walls Manufactured with Pinus rigida Miller

  • Park, Jun-Chul;Kim, Keon-Ho;Lee, Dong-Heub;Son, Dong-Won;Hong, Soon-Il
    • Journal of the Korean Wood Science and Technology
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    • v.39 no.2
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    • pp.140-147
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    • 2011
  • The strength properties of wooden retaining wall which was made with pitch pine were evaluated. Wooden retaining wall was made with diameter 90 mm of pitch pine round posts treated with CUAZ-2 (Copper Azole). The length of the front stretcher of the retaining wall was 3,000 mm. The distance between the headers (the notched member) is 1,000 mm in center and is 900 mm in side. There were connections every 2,000 mm because actually the length of stretcher is limited in the retaining wall. The strength test was carried out according to connection type because the section between stretchers can act as a defect. A result of the strength test according to connection type confirms that connection does not act as defect because the strength of retaining wall in single stretcher is similar to that in the section between stretchers. The strength test of the wooden retaining wall was carried out in 5 types according to the condition of the base section. When the upper soil pressure was 9.8 kN/$m^2$, the maximum load of the retaining wall fixing the front foundation shows higher values than those of others. But the total deformation is lower in the retaining wall not to fix a base section than in that to fix a base section. It is thought that the retaining wall not to fix a base section shows low value because the deformation is distributed throughout the retaining wall and it is confirmed that the soil pressure affects supporting the structure because the deformation of the retaining wall under low pressure is 3~4 fold higher than those of others. The failure mode of the retaining wall is the overturning type because the high section is deformed. Mostly, the failure mode is the separation of the header in the notched section.

Structural Performance of Joints for Partial Reinforced Beam Using GFRP Laminated Plate and Cylindrical Reinforced LVL Column (GFRP적층판을 활용한 보강보부재와 원통형 단판적층기둥재 접합부의 내력 성능평가)

  • Song, Yo-Jin;Jung, Hong-Ju;Lee, Jung-Jae;Suh, Jin-Suk;Park, Sang-Bum;Hong, Soon-Il
    • Journal of the Korean Wood Science and Technology
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    • v.42 no.3
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    • pp.282-289
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    • 2014
  • After being laminated with a combination of glass fiber reinforced plastic and plywood, the GFRP laminated plate was densificated for 1 hour at $150^{\circ}C$ with pressure of $1.96N/mm^2$. A partial reinforced beam was produced by attaching the 5 GFRP laminated plates to the joint of glulam and the column. In addition, the column to beam joint was produced by using reinforced laminated wooden pin which was made of GFRP sheet and plywood, fiber glass reinforced cylindrical-LVL column. The joint was made of round log, glulam and drift pin as the reference specimen, and its moment resistance was evaluated. As a result, the strength performance of specimens with partial reinforced beams were 1.8 times stronger than the reference specimen on average. Furthermore, rupture was neither occurred on partial reinforced beam nor column. Toughness and stiffness of joints were also fine. The GFRP sheet reinforced laminated plate showed better reinforcement effect than GFRP textile reinforced one. GFRP sheet was inserted into each layer of laminate, and it showed good condition in rotation-angle and strength, therefore it is the most appropriate to reinforce the part of the beam.

A Study on Store Design Strategy for Establishing Brand Identity - Focus on innovative products and spaces for experiences - (브랜드 확립을 위한 상점공간 디자인 분석 연구 - 혁신적 제품과 체험 공간을 중심으로 -)

  • Lee, So-Young;Park, Sa-Hue
    • Korean Institute of Interior Design Journal
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    • v.18 no.5
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    • pp.156-163
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    • 2009
  • Retail space itself could be one of the marketing strategies, through creating space, and communicating brand identity. Especially for innovative products, such as mobile technology products, store is not just to sell products but to provide experiences so that users can fudge usefulness of products and reduce uncertainties to adopt the products. The purpose of this study is to investigate how environmental features and physical artifacts contribute to promote experiences of innovative products in stores and how physical environment help to establish brand identity. For this study, site visits, observation, and literature review were conducted. For case studies, three retail spaces (Apple, Iriver, Sony) and one service space(TTL) were selected. Compared to the service space, three retail spaces have more transparent and open store front design characteristics. For the experiences of shoppers, products displayed in a radial shape, round shape, column shape, and around peripherals of the stores. A service oriented space, TTL zone is differentiated from three retail spaces in terms of layout, store front design, and experience areas. Compared to the traditional stores selling innovative products, the case stores showed more warm atmosphere using various shape, wood materials, lighting fixtures and furniture.

Consideration of Daldinia childiae as a New Record in Korea, Based on Morphological Characteristics of Korea Collections (한국에서 발견된 국내 미기록종 Daldinia childiae의 미세형태적 고찰)

  • Velmurugan, Natarajan;Han, Sang-Sub;Sa, Dong-Min;Lee, Yang-Soo
    • Applied Microscopy
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    • v.37 no.4
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    • pp.289-295
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    • 2007
  • The genus Daldinia is a member of the Xylariaceae that has brown to dark brown and phaseoliform single cell ascospores with a conspicuous full germ slit. The isolate of D. childiae collected from Mt. Deuk-yu in Korea were compared with similar taxa, D. eschscholzii and D. concentrica.. Ascospores were $11{\sim}13{\mu}m{\times}5.5{\sim}6{\mu}m$ in size, light brown to brown, unicellular, ellipsoid-inequilateral, with dull round ends. Ascospore showed very faint ornamentation at ${\times}7.0k$ magnification. It is one of the main morphological characteristic Korean collection of D. childiae under SEM level and a main reason of reinterpretation of D. concentrica in Korea. Using KOH-extractable pigment color of stroma, D. concentrica that also has supported the SEM level investigation. Daldinia concentrica, having those characteristic recorded in Korea, should be renamed as D. childiae. However, the isolate will be the first record as D. childiae, having precise morphological description in Korea.

Children's Bent Wooden Chair Design Using High Frequency Heat Molding Technique - Focused on Change of Kindergarten Environment -

  • Ryu, Eun-Seok;Choi, Kyung-Ran;Sung, Yun-Jung
    • Journal of the Korea Furniture Society
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    • v.22 no.3
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    • pp.230-238
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    • 2011
  • Consumers' expenditure is getting larger on children due to their parents' compensation for increase of double-income family life and decrease of birth rate caused by high economic growth. Increase of demand on children items in the market leads the necessity of development of furniture for children. This study is aimed to design children chairs that meet the environment for children. In this study, the age of children is defined to be 5~7 years old. In order to investigate what causes environment change, this study covers roughly change of environment, change of learning program and use of environment-friendly material. In such scope, we drew out the factors that the chairs for children shall be equipped with. Case studies were done through such drawn factors. The scope of the furniture for children is limited to the chairs for children among the ones made in either Korea or overseas. As a result, we could draw out such keyword of the furniture as storage, mobility, environment-friendly, object style image, preferred color, functionality and safety, based on which we could plan the design and make the final result through high frequency round molding manufacturing process.

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Cellulose Structures of Primary and Secondary Tissues in Pinus densiflora S. et Z. (소나무재의 1차조직과 2차조직 세포벽 중의 셀룰로오스 구조)

  • Kim, Nam-Hun;Lee, Kee-Young
    • Journal of the Korean Wood Science and Technology
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    • v.29 no.1
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    • pp.60-67
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    • 2001
  • The microscopic characteristics and cellulose structures of primary and secondary tissues in Pinus densiflora S. et Z. were examined. Cells of primary tissue in cross section showed an irregular arrangement and round shape. Fiber lengths were 200 to $250{\mu}m$ in primary tissue, and 1,500 to $1,600{\mu}m$ in secondary tissue. Cell diameters in primary tissue were larger than those in secondary tissue; 40 to $50{\mu}m$ in former and 10 to $20{\mu}m$ in latter. Crystallite width and d-spacing of (200) in both tissues did not show any significant differences. However, crystallinity indices by Segal's method showed significant differences as 23% in primary tissue and 35% in secondary tissue. In the orientation of cellulose microfibril, primary tissues had a random pattern, whereas, secondary tissues presented an oriented pattern with 20 to 30 degree. The cellulose crystalline of primary tissue was easily transformed into cellulose II by mercerization, but that of secondary tissue hardly transformed. It is considered that the difference of crystal transformation in both tissues could be caused by the difference of lignification.

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The Analysis on the Characteristics and the Structure of the Semi Automatic Dongdahoe Loom (전통 반자동식 동다회직기의 특성과 구조 분석에 관한 연구)

  • Park, Yoon Mee
    • Journal of the Korean Society of Costume
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    • v.65 no.6
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    • pp.15-24
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    • 2015
  • Dahoe is a traditional Korean term for cords and Dongdahoe for round cords. The main purpose of this study is to analyze the structure of a semi-automatic loom depicted in the paintings of Jun Geun Kim, and verify whether it actually worked or not. Jun Geun Kim is a genre painter of the late Joseon Dynasty. His nom de plume is Gisan and he drew genre paintings for foreigners who visited Korea in the late 19th century. These paintings are important in understanding the lifestyle and custom of the times. His paintings at the Staatliche Museen zu Berlin in Germany and the British Museum in England both depict a semi automatic loom that operates two looms at the same time. This is a unique loom that is not found in any other country and currently no artifacts of such loom exist in Korea. The study went through the following steps: We first analyzed the structure and the operating mechanism of the loom in the painting. The structure of each parts and their roles were also analyzed. Then a loom that was similar in structure and size was made to check if it was operational. The loom depicted in the paintings had some problems, and adjustments to fix the said problems were made accordingly. Wood was primarily used to make the $80{\times}90cm$ loom. The loom was used to make Dahoe and the study confirmed that there were no differences between the handmade Dongdahoe and the Dongdahoe made with the semi automatic loom.