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백합나무를 이용하여 제조한 3층 파티클보드와 배향성 스트랜드보드(OSB)의 물성에 관한 연구
서준원 ( Jun Won Seo ),강길우 ( Gil Woo Gang ),조건희 ( Gun Hee Jo ),박헌 ( Heon Park ) 한국목재공학회 2018 목재공학 Vol.46 No.1
This study was conducted to investigate a potential of Yellow poplar (Liriodendron tulipifera L.) as a raw material for the manufacturing of particleboard (PB) and oriented strandboard (OSB). PB panels were prepared at the parameters of 0.7 g/㎤ density, 15 mm thickness, three-layer, E1 grade urea-formaldehyde (UF) resin, emulsion wax, and hardener. OSB panels were manufactured with a density of 0.65 g/㎤, thickness of 10 mm, and E1 grade of UF resin. Particle size of the face layer of PB was 20∼80 mesh with 7∼9% moisture content (MC), while that of core-layer was 3∼20 mesh with 3∼5% MC, which was similar to the production condition of commercial PB. As a result, the manufactured PB panels with 15.8 mm thickness, 0.7 g/㎤ density, and 5.8% MC satisfied the requirement of bending strength of 15 type PB of Korean Industrial Standard (KS F 3104). Both internal bonding (IB) strength and surface screw withdrawal resistance also satisfied the requirement of 18 type PB of the standard. But, the edge screw withdrawal resistance satisfied the requirement of 15 type PB of the standard. These differences in properties could be due to the slenderness ratio of raw particles. In case of OSB panels with 10.7 mm thickness, 0.68 g/㎤ density, and 5.8% MC satisfied all the requirements of bending strength, screw withdrawal resistance, and IB strength of 18 type PB of the standard. These results suggest that Yellow poplar wood has a good potential as a raw material for the production of PB and OSB.
서준원 ( Seo Jun Won ) 동양철학연구회 2003 東洋哲學硏究 Vol.35 No.-
This essay purports to examine the religious significance of the Lunyu, the most important philosophical text of China but seldom religiously approached, with the themes of human existence, the completion of human existence, and the transcendence. Among a number of religious issues, the author makes it clear that his discussion is confined to the religious metaphysics but excludes the issues more important to the popular religion. The main body of the essay has two parts; one is `Preliminary Considerations` and the other is `The God and the Human Being in the Lunyu`. In the former part, the author introduces some Western study of religions and suggests the issues to be discussed in the latter. On this basis, characterising tian, written as the Heaven in the Lunyu as the transcendental God, the author defines ren, the core of Confucius` philosophy, as the ultimate end of the course in life to complete human existence. The author develops the discussion to the ontological conditions offered to a human being with ethical issues and finally examines the suitability of the attitude of Confucius to the advanced religious system.
소나무와 리기다소나무를 사용하여 제조한 목재펠릿의 품질 특성 비교
서준원 ( Jun Won Seo ),이응수 ( Eung Su Lee ),강찬영 ( Chan Young Kang ),김시백 ( Si Bak Kim ),윤용한 ( Yong Han Yoon ),박헌 ( Heon Park ) 한국목재공학회 2015 목재공학 Vol.43 No.3
The quality characteristics of the woodpellet manufactured from two domestic pines (Pinus densiflora S. et Z. and Pinus rigida Mill.) were investigated for the efficient energy use of woody biomass resources. Properties of woodpellets such as moisture content, heating value, ash content, apparent density and durability were determined by using the standard test method of woodpellets of Korea Forest Research Institute (KFRI) and elemental analysis. The results of elemental analysis for C, H, O and N showed 61.42% carbon, 5.56% hydrogen, 32.87% oxygen, and 0.15% nitrogen for Pinus densiflora S. et Z. and 61.03% carbon, 5.96% hydrogen, 32.83% oxygen, and 0.18% nitrogen for Pinus rigida Mill. No significant difference between Pinus densiflora S. et Z. and Pinus rigida Mill was observed on elemental analysis. Heating values of each woodpellet were ranged from 19.00 to 19.42 MJ/kg which satisfied the first grade quality standard (≥ 18.0 MJ/kg) by KFRI. The ash contents of woodpellet were slightly different between Pinus densiflora S. et Z. and Pinus rigida Mill., and satisfied the first grade quality standard (≤ 0.7%) by KFRI. Apparent density of woodpellet (Pinus densiflora S. et Z.) was passed the first grade standard level (≥ 640 kg/m3), and woodpellets from Pinus rigida Mill. satisfied the second grade quality of the standard. The moisture contents of each woodpellet were satisfied by the first grade quality standard (≤ 10%). The durability of woodpellet (Pinus densiflora S. et Z.) was passed the third grade level (≥ 95%), but Pinus rigida Mill. woodpellet was insufficient to satisfy the quality standard.
서준원 ( Jun Won Seo ) 동양철학연구회 2002 東洋哲學硏究 Vol.31 No.-
The topic of this essay is derived from the question whether or not the nothingness, or wu in Chinese, that is claimed as the ontological condition imposed on the reason of the present beings(the Fundamental Being), in early Chinese metaphysics is really logically possible. Owing to linguistic differences from the Western languages, this serious problem was quite invisible when `beingness of nothingness` is discussed only in East Asian Languages. In order to find an answer, the author attempts to analyse the structure of the ontological schema in early Chinese metaphysics and concludes that, in the early relevant Chinese texts, the Fundamental Being is not suggested to have a single quality but two dualistic ontological qualities; chaotic beingness and nothingness. This is because the ontological conditions the early Chinese philosophers thought the Fundamental Being to have is nothingness, as the exclusive ontological quality from undeniable beingness of the present beings. At the same time, it must be something existing to be there as the reason of the beingness of the present beings. Since the way to be of the Fundamental being has to be distinguished from that of the present beings, the Fundamental being as the source of the present beings, has to be an undifferentiated chaotic whole that includes everything but not a thing is sensible within.