• 한국해양환경ㆍ에너지학회지
• /
• 제17권4호
• /
• pp.268-273
• /
• 2014

어판장에서 발생되는 생선 손질 폐기물의 자원화를 목적으로 탄화실험을 실시하였다. 어류폐기물의 원소조성을 살펴본 결과 탄소함량과 수소함량이 각각 51.1%와 7.6%, 산소함량이 30.5%로 나타났다. 특히 질소와 황의 함량이 각각 9.8%와 1.0%로 높아 악취문제 등이 심각할 수 있다는 것을 알 수 있었다. 어류폐기물의 원소조성을 다른 폐기물과 비교해볼 때 탄소 및 수소의 함량이 상당히 높은 것으로 나타나 생선폐기물의 최종처리는 열적처리가 적합한 것으로 나타났다. 고등어, 갈치, 조기를 대상으로 내장이나 몸통, 개별 생선이나 이들을 혼합한 시료 모두에 대하여 탄화실험을 실시한 결과 탄화되는 패턴은 시료 종류에 관계없이 유사한 경향을 나타내었다. 탄화시간에 따른 수율변화는 탄화시간 5분, 10분일 때 탄화온도 변화에 따른 수율 변화가 크게 나타났고, 탄화시간 15분 이후에는 탄화온도 변화에 따른 수율 변화가 미미한 것으로 나타났다. 또한 탄화시간 30분 이상부터는 각 온도별로 시간변화에 따른 수율 변화가 미미한 것으로 나타나 탄화시간에 따른 수율변화는 30분 이상부터는 큰 영향을 미치지 않는 것으로 나타났다. 탄화온도에 따른 차이는 탄화온도 $400^{\circ}C$에서는 1차 휘발이 미미하여 2차 휘발이 일어난 $500^{\circ}C$와의 수율차가 크게 나타났다. 또한 탄화온도를 $600^{\circ}C$, $700^{\circ}C$로 하여 10분 이상 탄화시킨 결과 수율차는 미미한 것으로 나타났다.

• Journal of the Korean Wood Science and Technology
• /
• 제42권2호
• /
• pp.163-171
• /
• 2014

Environmental issues about indoor air quality have been increased and focused on volatile organic compounds (VOCs) caused cancer, asthma, and skin disease. Reducing VOCs has been attempted in many different methods such as using environmentally friendly materials and air cleaner or purifier. Charcoal is well known material for absorbing VOCs. Therefore, carbonized board from medium density fiberboard has been developed. We assumed that the source of carbonized boards can be any type of wood-based panels. In this study, carbonized boards were manufactured from oriented strand board (OSB) at 400, 600, 800, and $1000^{\circ}C$. Each carbonized OSB (c-OSB) was evaluated and determined physiomechanical characteristics such as exterior defects, dimensional shrinkage, modulus of elasticity, and bending strength. No external defects were observed on c-OSBs at all carbonizing conditions. As carbonizing temperature increased, less porosity between carbonized wood fibers was observed by SEM analysis. The higher rate of dimensional shrinkage was observed on c-OSB at $1000^{\circ}C$ (66%) than c-OSB at 400, 600, and $800^{\circ}C$ (47%, 58%, and 63%, respectively). The densities of c-OSBs were lower than original OSB, but there was no significant different among the c-OSBs. The bending strength of c-OSB increased 1.58 MPa (c-OSB at $400^{\circ}C$) to 8.03 MPa (c-OSB at $1000^{\circ}C$) as carbonization temperature increased. Carbonization temperature above $800^{\circ}C$ yielded higher bonding strength than that of gypsum board (4.6 MPa). In conclusion, c-OSB may be used in sealing and wall for decorating purpose without additional artwork compare to c-MDF which has smooth surface.

• Journal of the Korean Wood Science and Technology
• /
• 제42권2호
• /
• pp.130-137
• /
• 2014

Nondestructive evaluation (NDE) method by using a resonance frequency mode was carried out for ceramics made from particle boards with different phenol resin impregnation ratios (30, 40, 50, 60%) at carbonizing temperature of $800^{\circ}C$. The material for ceramics was Miscanthus sinensis var. purpurascens board. Dynamic modulus of elasticity increased with increasing impregnation ratio. There was a close relationship of dynamic modulus of elasticity and static bending modulus of elasticity to modulus of rupture (MOR). However, the result indicated that correlation coefficient is higher in dynamic modulus of elasticity to MOR than that in static modulus of elasticity to MOR. Therefore, the dynamic modulus of elasticity using resonance frequency by free vibration mode is more useful as a nondestructive evaluation method for predicting the MOR of ceramics made from Miscanthus sinensis var. purpurascens particle boards by different phenol resin impregnation ratios.

• 농업생명과학연구
• /
• 제44권4호
• /
• pp.21-27
• /
• 2010

인피섬유로 한지를 제조하고 남은 닥나무 목질부를 고부가치화 하기 위하여 닥나무 목질부로 제조된 파티클보드를 이용하여 탄화온도 변화에 따른 닥나무재료 우드세라믹을 제조하여 물성을 검토하였다. 밀도, 휨강도성능, 브리넬 경도, 압축강도 등은 탄화온도가 증가할수록 증가하였으며 밀도와 휨강도성능, 경도, 압축강도사이에는 유의성이 인정되는 밀접한 상관관계를 나타내었다.

• 헤리티지:역사와 과학
• /
• 제35권
• /
• pp.138-158
• /
• 2002

To compare and analyze technical system related to manufacturing of ironware during the period of the Three Kingdoms, an analysis was conducted on the minute system of metalwork, as study objects, of the remains of the Mt. Wolpyeong fortress wall in Daejeon in the period of capital during the era of the Three Kingdoms in the 5th century, the Sanwol-ri remains in the 6th century in Gunsan and the remains of ironware excavated from the great ancient tomb of Hwangnam of the Silla dynasty in the 5th century. The result of analysis shows that in the most of the casting products, the minute system of white cast iron were contained. While the iron part of decarbonization was in the system by casting as white cast iron in the central part, on the surface layer it was turned out that comparatively uniform 100% pearlite system of about 1~2mm degree was existing. The part of pearlite on the surface layer was caused by decarbonization, which appears in all the parts of blade front end and handle. Therefore, it was found that the iron part of decarbonization was manufactured by casting, and then was processed at the high temperature by decarbonization. For the products of forging, after processing the products on the basis of pure iron for materials, they manufactured the ironware that raises the strength by carbonizing that keeps carbon infiltrated on the necessary part, by the method of black smith welding that add pure iron to steel, or by varying the method of heat processing onto the part required of strength. Though limited, we could understand that the technical systems for manufacturing skill of ironware in the areas of Baekje and Silla were different each other. In the technical system for Hwangnam great ancient tomb in the Silla area, it is found that they had raised the strength on the necessary part by applying the steelmaking method of carbonizing in the last stage of production of products, in the meantime in Baekje area, it appears that they had produced steel in advance in the first stage of production of the products, and used the produced steel only to the necessary part.

• 한국마린엔지니어링학회:학술대회논문집
• /
• 한국마린엔지니어링학회 2000년도 춘계학술대회 논문집(Proceeding of the KOSME 2000 Spring Annual Meeting)
• /
• pp.93-99
• /
• 2000

This study deals with the evaluation of bending fatigue strength in shaving gears, We manufactured gears using manufacture processes that are currently used in most gears manufacturing companies. The test gears are hobbed then the tooth surface are treated by a combination of shaving carbonizing and shot peening. The constant stress amplitude fatigue test is performed by using an electrohydraulic servo-controlled pulsating tester. The S-N curves are obtained and illustrated. In this study we investigated the effect of shaving process and shot peening on fatigue strength, The effect of shaving process ad shot peening on the fatigue strength is evaluated quantitatively,. The enhancement of fatigue strength due to shaving process and shot peening is clarified

• International Journal of Automotive Technology
• /
• 제8권3호
• /
• pp.343-349
• /
• 2007

One of the useful technologies for light-weightening of components required in the automobile and machine industry is to use high strength materials. To improve material properties, the carbonizing treatment, nitrifying treatment, and shot-peening method are representatively applied. However, the shot-peening method is generally used to remove surface defect on steel and to improve the fatigue strength of the surface. Benefits of shot-peening are increasing resistance against fatigue, stress corrosion cracking, fretting, galling, erosion and closing of pores. In this paper, the effect of shot-peening on the corrosion of SUP-9 steel immersed in a 3.5% NaCl solution and corrosion characteristics from heat treatment during the shot peening process has been investigated. The immersion test was performed on four kinds of specimens. Corrosion potential, the polarization curve, residual stress etc. Were analyzed from the experimental results.

• 한국응용약물학회:학술대회논문집
• /
• 한국응용약물학회 2003년도 Annual Meeting of KSAP : International Symposium on Pharmaceutical and Biomedical Sciences on Obesity
• /
• pp.68-68
• /
• 2003

Herbchoke solution produced by Choa pharmaceutical company contained pyroligneous liquid and extracts from artichoke leaves. Pyroligneous liquid is produced by process carbonizing Oak in 350∼400$^{\circ}C$. It contain water 96%, acetic acid 3% and organic compound 1%. There are 200 kinds of constituents including minerals, vitamin B-complex and organic acids in it. The organic acids of them were presumed as active materials. It is traditionally used for treatment of stress related disorder, hepatic disease, immune disorder, G-I disorder and inflammatory disease. Extracts from artichoke leaves are traditionally used for treatment of stress related disorder, that is, hepatic disease, dyspeptic disorder, hyperlipidemic disorder and diuretic disorder. The aim of this study was to investigate anti-stress effects of Hervchoke juice produced from Choa pharmaceutical company.

• Bulletin of the Korean Chemical Society
• /
• 제35권8호
• /
• pp.2357-2360
• /
• 2014

Phosphorus-doped soft carbons were successfully prepared by carbonizing petroleum cokes treated with phosphorus acids, such as $H_3PO_2$, $H_3PO_3$, and $H_3PO_4$. The effect of the type of phosphorus acids used on the composition, structure, and electrochemical performance of the soft carbons was extensively investigated. The soft carbons modified with $H_3PO_3$ and $H_3PO_4$ exhibited dramatically improved reversible capacities and outstanding rate capabilities.

• Journal of the Korean Wood Science and Technology
• /
• 제28권4호
• /
• pp.51-55
• /
• 2000

The woodceramics which are new porous carbon materials were obtained by carbonizing from thinned small log of Aomori HIBA (Thujopsis dolabrata S. et. Z. var. hondae M.) impregnated with phenol resin in a vacuum furnace. During the carbonization process, the resin changes into glassy carbon, which has superior property. The resin impregnation rate and bending strength depend on the types of board and density. In this paper, the manufacturing method of woodceramics made from thinned small logs of Aomori HIBA was introduced and some properties were examined.