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탄소섬유쉬트로 보강된 RC보의 구조내력에 관한 실험 연구
정병옥,이우진,윤승조,김성수 대한건축학회 2000 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.20 No.2
In general, the Carbon Firber Sheet is used to strengthen of Reinforced Core Beams. But the flexural strength of Reinforced Concrete Beams wig Carbon Firber Sheets is not clearly defined. Therefore, the pose of this pate is to investigate the flexural strength effect of Reinforced Concrete Beams with Carbon Firber sheets. The experiment parameters of in this study are the amount of sheets, the shape, the U type anchorage, and the Pre-loading. The result shows that ire flexural strength, the shape of failure, the failure loads, and the ductility of Reinforced Concrete beams with Carbon Firber Sheets.
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정병옥 한국생체재료학회 2007 생체재료학회지 Vol.11 No.1
Bioceramics are considered biocompatible, hard, brittle materials with relatively poor tensile properties but with excellent compressive strength, high resistance to wear, and with favourable, low frictional properties in articulation. The low frictional properties are enhanced by the fact that ceramics are hydrophilic and can be highly polished, which provides a superior load-bearing surface with itself or against polymeric materials in physiological environments. Bioceramics, natural or synthetic, used singularly or with additional organic or polymeric materials, are amongst the most promising of all biomaterials for hard and soft tissue replacement applications. Recent advances in the production and use of natural bioceramics for applications in hard and soft tissue replacement are discussed. Also, the clinical status of bioceramics for bone tissue-engineered alternatives is discussed based on the patent and market information.
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정병옥,이준우,최영선,손종구 한국생체재료학회 2007 생체재료학회지 Vol.11 No.1
Recent advance in genetic engineering and production of the monoclonal antibody(MAb) allows one to generate therapeutic proteins in large amounts. Therapeutic proteins we overview here include interferon, insulin, EPO, colony stimulating factor (CSF), blood factor, therapeutic enzymes, therapeutic hormones, and cytokines (growth factors, interleukins etc.). We focused on the recent progress in research and development of MAb-based therapeutics and analyzed the recent market trend related to the therapeutic proteins.
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MALEIC ACID그라프트 공중합 CHITOSAN의 우유폐수에 대한 응집효과
김용범,정병옥 서울産業大學校 1990 논문집 Vol.31 No.1
게 껍질로 부터 추출한 chitosan에 maleic acid를 그라프트 공중합하여 양이온성과 음이온성을 함께 지닌 양쪽성 응집제를 합성하였으며 이의 산업현장에서의 유용성 여부를 시험하기 위해 1차적으로 우유공장 폐수에 적용해 본 결과 현재 가장 많이 이용되고 있는 Alum 무기계 응집제보다 전산성 PH영역에 걸쳐 월등히 뛰어난 응집효과를 보였으며 특히 pH 6.5에서 가장 높은 침강속도 및 투과도를 나타내었다. 보조제로 소량의 Alum을 첨가하면 더욱 높은 응집효과를 보여 주었다. 투입량은 우유폐수 30ml당 27.8ppm정도에서 부터 최대의 효과를 얻을 수 있었다. Chitosan was derived from the shells of crab and graft-copolymerized with maleic acid for a development of a natural polymeric flocculant which was enriched with cationic and anionic functional groups(?? groups and -COO- group, respectively) so that it could play an amphibious flocculation power in both acidic and basic solutions. In demonstrated an excellent flocculation power in comparison with the inorganic flocculant, alum, used most in industry these days, all through the acidic pH range of the milk process wastewater. It showed the highest sedimentation rates and transmittances at pH 6.5. Its flocculation power was enhanced by adding small amount of alum as an auxiliary additive. Its most effective dosage began with 27.8 ppm per 30ml of the wastewater. The authors expect the newly developed flocculant to be very promising and useful since its excellent dehydration and natural decomposition nature.
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정병옥,이준우 한국생체재료학회 2007 생체재료학회지 Vol.11 No.1
Natural and absorbable polymers have been used for many pharmaceutical and biomedical applications for several decades. Of these polymers, the application of chitosan and hyaluronic acid based polymers has received a great deal of attention in the past 15 years for use in controlled drug delivery systems, tissue repair, tissue engineering, and controlling certain biological events. Interest in synthetic absorbable polymers has grown considerably over the last three decades, principally because of their transient nature when used as biochemical implants or drug carriers. Recently, however, investigators have revived interest in naturally derived polymers. The genesis of absorbable polymers was driven by the need to replace the highly tissue-reactive, absorbable, collagen-based sutures with synthetic polymers, which elicit milder tissue response. Technology of absorbable/biodegradable polymers has evolved in two independent areas. The evolution of natural polymers took place through chain modification of existing materials using chemical means or modulating the biosynthetic functional properties. On the other hand, the evolution of synthetic polymers has been achieved through modulating their chemical composition using several polymerisation techniques and, to a lesser extent, chemical modification of presynthesized polymers.
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정병옥,방현수,Jung, Byeong-Ok,Bang, Hyun-Soo The Society of Digital Policy and Management 2014 디지털융복합연구 Vol.12 No.7
본 연구에서는 하지 골절 후 회복기 환자에게 러시안전류 자극이 넙다리네갈래근의 근수행력과 활성도에 미치는 영향을 알아보기 위하여 실시하였다. 본 연구는 2013년 1월 9일에서 2013년 3월 16일까지 실시하였으며, 하지 골절 후 회복기에 있는 환자 20명을 대상으로 실험을 실시하였다. 러시아 전류자극기의 큰 도자를 넙다리네갈래근의 근위부에 위치하고, 작은 도자는 원위부에 부착시키고 한 주에 세 번, 6주 동안 적용하였다. 대상자의 넙다리네갈래근의 근활성도를 측정하기 위해 근전도가 이용되었고, 근수행력을 측정하기 위해 등속성기기가 이용되었다. 연구결과 기간별 넙다리네갈래근의 근수행력 차이는 러시안전류 치료 전과 비교하여 4주 후와 6주 후에서 유의한 근수행력의 증가를 나타내었다. 또한 넙다리곧은근, 안쪽넓은근, 가쪽넓은근의 근활성도는 치료 전과 비교하여 4주 후와 6주에서 유의한 증가를 나타내었다. 이와 같은 결과는 러시안 전류가 하지 골절 등과 같은 문제로 인해 약화된 하지 근육의 근력 강화를 위해 선택될 수 있는 효과적 치료 방법이라 할 수 있다. The present study was aimed to comprehend the effect of the Russian current stimulation on the muscular performance and activity of quadriceps femoris muscle of the convalescent patient after the leg fracture.This study conducted test based on 20 patients after leg fracture. Russian current was applied for six weeks as three times in a week, between January 9, 2013 and 15 March 16, 2013. The electromyogram was used to measure the muscle activity of the quadriceps femoris, and the isokinetic equipment was used to measure the muscular performance. The muscular performance difference by duration depending on the application of the Russian current showed the significant increase in all muscular performances. The activity of all muscles of the quadriceps femoris muscle by duration showed significant increase. These results showed that the Russian current can be the effective treatment method for enhancing the muscular strength of the weakened lower limbs muscle due to the problem such as the leg fracture.
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