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이용규 한국고용정보원 2023 지역산업과 고용 Vol.- No.-
재생(regeneration)의 어원은 유전자(gene)입니다. 다시 말해서 유전자를 다시 만드는 일, 바꾸는 일이 재생의 본래 뜻입니다. 원형, 시스템은 놔두고 외형만 바꾸는 것은 재생의 본질이 아닙니다. 유전자를 바꾸는 일은 결코 쉽지 않습니다. 게다가 이제까지 살아왔던 삶의 체계를 3년 만에 바꾸는 것은 더욱 어려운 일입니다. 도시재생이 도시재생사업만으로 달성될 수 있다면 그것은 재생이 아닌 재개발입니다. 결국 뉴딜사업은 재생을 위한 마중물의 역할이 되어야 합니다. - 『사북해봄마을 아카이브』(이용규, 2022, p. 6) 중 발췌 -
Candida kefyr β- galactosedase 의 고정화에 관한 연구
이용규,정기철,김창열 한국낙농학회 1989 韓國酪農學會誌 Vol.11 No.3
Candids kefyr CBS 834의 β-galactosidase를 cellulose triacetate에 고정화하였다. 효소를 고정화하기 위한 최적조건은 100㎖ methylene chloride에 10g의 cellulose triagetate를 용해한 액에 효소액 15%을 첨가하여 만든 후, 200 strokes/min으로 진탕반응했을 때 얻어졌다. 또한 섬유의 절단길이는 효소활성에 큰 영향을 주지 않았다. 고정화효소의 최적온도와 pH는 각각 50℃와 7.0이었고, 활성화에너지는 8,539 cal/mole이었다. ONPG를 기질로 하였을 경우 고정화 효소의 K_m과 V_(max)은 각각 7.4×10^(-5)M과 66.7 unit/㎎ protein이었고, 유당에 대한 K_m과 V_(max)은 3.3×10^(-4)M과 29.4 unit/㎎ protein이었다. 고정화 효소를 4℃에서 30일간 저장후 잔존활성과 3회 재사용후 잔존활성을 조사할 결과 각각 95%와 94%을 유지하였다. 고정화 효소 1g(190 unit)을 50㎖의 탈지유와 5% 유당용액에 첨가한 후 30℃에서 10시간 반응시켰을 때 각각 10%와 15%의 유당분해율을 보여주었다. β-Galactosidase from Candida kefyr CBS 834 was immobilized in the cellulose triacetate. The optimal condition for the immobilized enzyme was obtained by 15% of the enzyme solution added to 100㎖ of methylene chloride and 10g of cellulose triacetate. The length of fiber had hardly any an effect on the enzyme activity and the optimal condition for reciprocating water bath shaker was 200 strokes per minute. The optimal temperature and pH for the immobilized enzyme were 50℃ and 7.0, respectively. The activation energy for the immobilized enzyme was 8,539 cal/mole. The Km and Vmax of the immobilized enzyme, on ONPG were 7.4 × 10^(-5)M and 66.7 unit/㎎ protein, whereas those on lactose were 3.3 × 10^(-4)M and 29.4 unit/㎎ protein, respectively. The rate of remained enzyme activity for the immobilized enzyme stored at 4℃ for 30 days was 95%, and when reused for three times was 94%. When the skim milk (4.8% lactose) and 5% lactose solution of 50㎖ were reacted with the immobilized enzyme (190 unit) for 10hrs at 30℃, 10% of the lactose in skim milk was hydrolyzed, whereas 15% of the lactose in 5% lactose solution was hydrolyzed.
도공액의 보수성에 관한 연구(제5보)-알칼리 반응형 보수.유동성 개량제의 적용-
이용규,엄기용 한국펄프종이공학회 1997 펄프.종이기술 Vol.29 No.4
Sole-binder formulation has been recently introduced to solve the problems of coating process and printability caused by use of natural polymer However, the decrease of natural polymer application causes another problem in paper coating. Therefore, synthetic thickener is used to get similar effect to natural polymer usage. In this study. low shear viscosity, dewatering of coating colors were measured to evaluate the performance of the alkali sensitive water retention and rheology modifiers. The effects of alkali sensitive thickener on the physical properties of coated paper and printability were also investigated. The gloss and printability of coated paper containing the synthetic flow modifier were similar or superior to those of CMC containing coated paper. This modifier was also effective to improve the problems caused by the use of starch. The results indicated that the flow modifier synthesized with alkali sensitive thickener can reduce the problems of natural polymer and could be a good substitute f3r a natural polymer.
도공액의 보수성에 관한연구(제4보)- 알칼리 반응형 보수.유동성 개량제의 합성 -
이용규,엄기용 한국펄프종이공학회 1997 펄프.종이기술 Vol.29 No.3
Natural water-soluble polymers such as starch, casein and carboxy methyl cellulose(CMC) have been limited in their uses. However, the proper water retention of coating colors can not be obtained without addition of these polymers. Furthermore, the coating runnability and the physical properties of coated paper were not also satisfied. Therefore, the objective of this study was to synthesize the water retention and flow modifiers which can improve the water retention and flow properties of coating colors. We have measured physical properties of flow modifiers and coating colors which included flow modifiers. The viscosity of flow modifiers was very low at acid pH, and rapidly increased at about pH 7, and gradually reached to equilibrium at alkali pH. Such an increase comes from the molecular weight of flow modifiers and the amount of acrylic and methacrylic acids. The viscosity of coating color containing the flow modifiers was lower than that containing CMC. However, both of them had little difference in water retention. The water-phase viscosity of synthetic modifier containing coating color was either higher or similar compared to that of CMC containing coating color. The high shear viscosity of coating colors was low. Therefore, it can be concluded that the synthetic flow modifiers are very useful for improvement of flow properties and water retentions.
종이 도공용 고광택 유기안료의 적용에 관한 연구(제2보) -안료의 혼합비율이 도공층의 적층구조와 광학적 특성에 미치는 영향-
이용규,정경모 한국펄프종이공학회 2000 펄프.종이기술 Vol.32 No.4
The main objective of this study was to investigate the packing state and optical properties of coated paper prepared with different coating colors by varying the blending ratio of such pigment as clay, $CaCO_3$, and plastic pigment. To evaluate the effect of packing state of pigment on the properties of coated paper, the coating thickness, which was theoretically calculated by specific gravity, and packing volume of pigment were used. It was found that there exists close relationship between the coating thickness and surface property of coated paper. For instance, the macro roughness(smoothness) of coated paper is closely related to bulkiness. Plastic pigments used in this research has a high finishing efficiency on the light weight coatings. Especially, hollow sphere pigment was very effective for improving the property of coated paper produced in this test. And when HSP was blended with $CaCO_3$the surface property such as smoothness and gloss improved significantly.