• 한국산업융합학회 논문집
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• 제10권4호
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• pp.235-240
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• 2007

Special quality of automobile CMC(clutch master cylinder) and analyzed aluminum, plastic material comparison. Efficiency of plastic master cylinder can modularize higher, light weight anger of parts, several piece parts by single parts, prove NVH(Noise, Vibration, Harshness) than aluminum master cylinder as analysis result. Also, structure is easy simplicity, exchange, maintenance costs can be reduced and decrease environmental pollution because recycling is superior.

• Geomechanics and Engineering
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• 제34권3호
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• pp.221-231
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• 2023

Biopolymer stabilization is a sustainable alternative to traditional techniques that cause a lesser negative impact on the environment during production and application. The study aims to minimize the biopolymer dosages by sizing the bio-additives to the nanoscale. This study combines the advantages of bio and nanomaterials in geotechnical engineering applications and attempts to investigate the behaviour of a low viscous biopolymer, nano sodium carboxymethyl cellulose (nCMC), to treat organic soil. Soil is treated with 0.25%, 0.50%, 0.75% and 1.00% of nano-bio additive, and its effect on the plastic behaviour, compaction characteristics, strength, hydraulic conductivity (HC) and compressible nature are investigated. The strength increased by 1.68 times after 90 days of curing at a dosage of 0.5% nCMC through the formation of gel threads connecting the soil particles that stiffened the matrix. The viscosity of 1% nCMC increased exponentially, deterring fluid flow through the voids and reduced the HC by 0.85 times after curing for 90 days. Also, beyond the optimum dosage of 0.50%, the nCMC forms a film around the soil particles that inhibits the inter-particle cohesion causing a reduction in strength. Experimental results show that nCMC can effectively substitute conventional additives to stabilize the soil.

• The Korean Journal of Ceramics
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• 제6권3호
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• pp.201-205
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• 2000

Fiber reinforced plastic (FRP) composites and ceramic matrix composites (CMC) which contain electrically conductive phases have been designed and fabricated to introduce the detection capability of damage/fracture detection into these materials. The composites were made electrically conductive by adding carbon and TiN particles into FRP and CMC, respectively. The resistance of the conductive FRP containing carbon particles showed almost linear response to strain and high sensitivity over a wide range of strains. After each load-unload cycle the FRP retained a residual resistance, which increased with applied maximum stress or strain. The FRP with carbon particles embedded in cement (mortar) specimens enabled micro-crack formation and propagation in the mortar to be detected in situ. The CMC materials exhibited not only sensitive response to the applied strain but also an increase in resistance with increasing number of load-unload cycles during cyclic load testing. These results show that it is possible to use these composites to detect and/or fracture in structural materials, which are required to monitor the healthiness or safety in industrial applications and public constructions.

• 폴리머
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• 제34권4호
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• pp.363-368
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• 2010

창상 회복에 있어 적절한 산성의 환경은 세균의 증식을 막을 뿐만 아니라 세포의 활성도를 증가시키고 섬유아 세포의 증식을 촉진시키며 배열을 고르게 유지하여 결국 성숙된 상피화를 가져오게 된다. 본 연구에서는 펙틴과 CMC 의 다양한 조성으로 이루어진 드레싱제를 이용하여 펙틴과 CMC의 조성비와 이에 따른 pH의 변화가 신선창상, 감염 창상 및 화상에 있어 창상치유속도, 상피화 정도 및 콜라겐 침착 등에 미치는 영향과 이의 새로운 드레싱 재료로서의 가 능성을 알아보기 위해 동물실험을 시행하였다. 실험 결과로부터 pH 4.67인 펙틴/CMC＝16/19 군이 급성창상의 창상 회복에 있어 창상의 수축률, 치유율 및 상피화율이 다른 군에 비해 높은 정도를 보여 가장 우수한 창상 치유 효과를 보임을 알 수 있었다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2007년도 춘계학술대회 논문집
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• pp.137-138
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• 2007

• 한국기계가공학회지
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• 제6권2호
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• pp.47-51
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• 2007

Special quality of automobile clutch master cylinder(CMC) and analyzed aluminum, plastic material comparison. Efficiency of plastic master cylinder can modularize higher, light weight anger of parts, several piece parts by single parts, prove NVH(Noise, Vibration, Harshness) than aluminum master cylinder as analysis result. Also, structure is easy simplicity, exchange, maintenance costs can be reduced and decrease environmental pollution because recycling is superior. According as content of glass fiber increases, mechanical properties of matter of material increase equally and glass fiber changed variously by condition on manufacturing process. Through comparison analysis with Plastic Body development connection site, did verification.

• 한국기계가공학회지
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• 제6권1호
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• pp.57-61
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• 2007

Special quality of automobile clutch master cylinder(CMC) and analyzed aluminum, plastic material comparison. Efficiency of plastic master cylinder can modularize higher, light weight anger of parts, several piece parts by single parts, prove NVH(Noise, Vibration, Harshness) than aluminum master cylinder as analysis result. Also, structure is easy simplicity, exchange, maintenance costs can be reduced and decrease environmental pollution because recycling is superior. According as content of glass fiber increases, mechanical properties of matter of material increase equally and glass fiber changed variously by condition on manufacturing process. Through comparison analysis with Plastic body development connection site, did verification.

• 약학회지
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• 제35권4호
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• pp.319-325
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• 1991

Aluminum phosphate gel was synthesized by reacting aluminum sulfate as a soluble aluminum salt to tribasic sodium phosphate in this study. The optimal synthesis conditions based on the yield of product were investigated by applying Box-Wilson experimental design. It was found that optimal synthesis conditions were as follows: Reaction temperature; $61~71^{\circ}C$, concentration of two reactants; 12.27~13.83%, concentration ratio of two reactants; [AI$_{2}$(SO$_{4}$)$_{3}$]/[Na$_{3}$PO$_{4}$]= 0.5, reaction time; 10.9~12.1 minutes, drying temperature of product; $60~72^{\circ}C$. Aluminum phosphate gel prepared by the optimal synthesis conditions was suspended with four types of natural and synthetic gums at the concentration of 0.375~1.5wv%. Their Theological properties of aluminum phosphate gels were examined with Haake-Rotovisco RV 20 rotational viscometer. It showed that the higher concentration of suspending agents and lower temperature, the higher viscosity. Aluminum phosphate gel suspended by pectin and agar showed plastic flow with rheopexy, and their gels suspended by sodium alginate and sod. CMC showed plastic flow with thixotropy.

• Archives of Plastic Surgery
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• 제36권5호
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• pp.543-547
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• 2009

Purpose: Adhesion is the most common and troublesome complication after repair of flexor tendon injury. Recently, use of sodium hyaluronate derivatives for adhesion prevention is increasing. A commercial product, Guardix$^{(R)}$, sodium hyaluronate(NaHe) combined with carboxymethylcellulose(CMC) has been newly developed as a preventive material for adhesion. We have investigated its effect in rabbits. Methods: Twenty seven male New Zealand white rabbits were operated under ketamine anesthesia. After tendon repair in zone II of the hind paw, Guardix$^{(R)}$(experimental group) or normal saline(control group) was administered. Biomechanical tests were performed to estimate adhesion formation at 2, 4, 8, and 12 weeks after the operation. Maximum tensile load to flex the distal interphalangeal joint 50 degree from its resting state(MTL50) was measured, depicting the amount of adhesion formed. Subsequently, breaking strength was assessed. Results: There were no postoperative complications such as infection, wound dehiscence, or hematoma. MTL50 was significantly lower in the experimental group than in the control group at 4, 8, 12 weeks (p<0.05). Mean value of MTL50 was 6.64N in the experimental group and 28.53N in the control group at 12 weeks after surgery. There were no significant differences in breaking strength. Conclusion: Our results indicate that Guardix$^{(R)}$ is helpful in reducing adhesion formation and does not interfere with normal healing processes of the tendon.

• 한국작물학회지
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• 제41권5호
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• pp.535-541
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• 1996

종자가 대단히 미세하여 육묘과정에서 많은 노동력이 소요되는 담배종자를 pelleting하여 육묘과정을 생력화할 목적으로 실험을 실시하였다. Pelleting 방법은 종자+pelleting 물질(bentonite, cellulose, clay, vermiculite) + 접착제(polyox, pelgel, CMC, water)를 혼합하여 반죽을 만든 후 성형판을 이용하여 wn조식으로 pellet을 만들었다. 각 재료별 pellet 종자의 특성 및 발아율을 조사하여 다음과 같은 결과를 얻었다. 1. pellet종자의 경도는 접착제의 농도에 비례하여 강했고, 재료별로는 bentonite 가 가장 경도가 강했고 어느 재료에서나 접착제의 농도에 비례하여 강했다. 또 200, 400, 600, 800g press/pellet의 경도를 가진 pellet종자의 파괴율은 각각 7.5%, 0.9%, 0.6%, 0.5% 였다. 2. Pelleting 물질 1g으로 지름 및 높이가 각각 2mm인 pellet 종자를 cellulose, bentonite, clay에서 각각266개, 92개, 57개 만들 수 있었다. 3. 담배종자와 재료의 혼합비율에 따라 pellet종자 1입당 포함된 종자의 수를 임의로 조절할 수 있었다. 또 pellet 당 2∼3개의 종자를 목표로 했을 때 종자가 포함되지 않은 pellet은 6.9∼16.0% 였다. 4. Pellet 종자의 공기 중 수분흡수율은 재료별로 cellulose>bentonite>clay 순으로 낮았다. 5. Bentonite와 cellulose를 재료로한 pellet 종자의 발아율은 무처리(나종자)와 차이가 없었으나, clay를 재료로한 pellet종자에서는 paper towel 에서나 vermiculite 상토에서 모두 뚜렷한 발아저해 현상이 나타났다.