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구석본, 곽복식, 권재현 경성대학교 환경문제연구소 2000 環境硏報 Vol.10 No.1
The most important thing in sludge treatment is to reduce the volume of sludge. To achieve this purpose, sludge is usually dewatered after conditioning by polymer. For efficient dewatering and its economic operation, polymer should be dosed properly. Therefore, the possibility of filtrate viscosity as a tool for the optimization of polymer dose in waterworks sludge conditioning was estimated in this study. In conclusion, it may be effective and accuracy to use filtrate viscosity as a control parameter to determine the optimum dose of polymer in sludge dewatering. Especially in case of cationic polymer conditioning, filtrate viscosity can be used effectively for this purpose. However, In contrast filtrate viscosity can not be utilized as a control tool if nonionic or anionic polymer were dosed.
고등학교 물리 수업에서의 무아레 간섭무늬 활용에 관한 연구
나구열,육근철,김용복 공주대학교 사범대학 과학교육연구소 1997 과학교육연구 Vol.28 No.1
수파투영장체에 의한 수면파 실험은 여러 가지 단점이 있기 때문에 교육현장에서 교사들은 이 실험을 기피하는 경향이 있다. 그래서 본 연구에서는 무아레 무늬를 이용한 여러 가지의 파동현상을 설명할 수 있는 새로운 보조학습자료를 이용한 교수 방법을 제안하고 적용하였다. 무아레 무늬를 보조학습자료로 사용한 결과 학생들은 파장, 입사각, 반사각, 마디선수 등을 쉽게 측정할 수 있었다. 따라서 무아레 무늬는 여러 가지 파동 현상을 설명하는 보조학습자료로 활용 가능함을 보여 주었다. The surface water-wave experiments using a ripple tank have several demerits. It is difficult to measure the period and wavelength of the water wave. Also, the experimental apparatus itself is very complicated. From these reasons, many physics teachers hesitate to do water wave experiments in their classes. Therefore, we proposed a new simple teaching method to explain several wave phenomena in water wave by using moire fringes as supplementary materials. As a results, we recognized that the students carry out experiments in an hour and the concept of wave phenomena in wave experiments because they can easily understand several wave phenomena by measuring wave length, incidence and refraction angle, number of nodal lines, reflection nagle in surface water wave experiments.
Koo, Bon Chul,Kwon, Mo Sun,Choi, Bok Ryul,Kim, Jin-Hoi,Cho, Seong-Keun,Sohn, Sea Hwan,Cho, Eun Jung,Lee, Hoon Taek,Chang, Wonkyung,Jeon, Iksoo,Park, Jin-Ki,Park, Jae Bok,Kim, Teoan 충남대학교 형질전환복제돼지연구센터 2007 논문집 Vol. No.10
The Moloney murine leukemia virus (MoMLV) -based retrovirus vector system has been used most often in gene transfer work, but has been known to cause silencing of the imported gene in transgenic animals. In the present study, using a MoMLV-based retrovirUs vector, we successfully generated a new transgenic chicken line expressing high levels of enhanced green fluorescent protein (eGFP). The level of eGFP expression was conserved after germline transmission and as much as 100μg of eGFP could be detected per 1 mg of tissue protein. DNA sequencing showed that the transgene had been integrated at chromosome 26 of the G₁and G₂generation transgenic chickens. Owing to the stable integration of the transgene, it is. now feasible to produce G₃generation of homozygous eGFP transgenic chickens that will provide 100% transgenic eggs. These results will help establish a useful transgenic chicken model system for studies of embryonic development and for efficient production of transgenic chickens as bioreactors.
기술논문 : 유리섬유강화슬래그(Glass-fiber Reinforced Slag)의 경관석 성능 적합성 평가
윤복모 ( Bok Mo Yoon ),이용복 ( Yong Bok Lee ),구본학 ( Bon Hak Koo ) 한국환경복원기술학회(구 한국환경복원녹화기술학회) 2013 한국환경복원기술학회지 Vol.16 No.2
This study was carried out to verify the suitability of GRS(Glass-fiber Reinforced Slag) as natural type landscape stone according to the material property and structural safety performance standards. The structural safety performance of the GRS panel showed 12.4MPa and l6.2MPa each in flexural strength at 2 and 3% content of glass fiber while the flexural strength at 4 and 5% of glass fiber content showed 26.9MPa, and 30.2MPa, respectively, all satisfying the standards. In addition, air-dried gravity was found to be 1.82 -1.89 in measuring range at 2 -5% level of glass fiber content, satisfy the existing standards l.8-2.3.Tn structural safety performance, the range of flexural strength consequent on glass fiber content was surveyed to be 12.8 -30.2MPa, all satisfying the performance standards, while 10MPa and more while the compressive strength range was found to be 41.5 -53.3MPa, all satisfying the performance standards, 40- 6OMPa.This study judged the suitability of only the items for a property of matter of landscape stone GRS by applying the natural-form landscape stone GFRC material standard, but in case an installation constructed with GRS material comes into existence later, there should be comprehensive performance guidelines through the research on durability, landscape performance and environmental and ecological performance.
식육단백질과 친수성 콜로이드의 상호결합 특성을 이용한 저지방 육제품 제조기술 개발 - Ⅱ 모델연구결과를 이용한 저지방 소시지의 개발
진구복(Koo Bok Chin),이홍철(Hong Chul Lee) 한국식품영양과학회 2002 한국식품영양과학회지 Vol.31 No.4
본 연구는 유화형 소시지와 유사한 물성을 갖는 저지방 소시지를 제조하기 위하여 실시하였다. 이전의 모델연구결과를 통해 얻은 최적조건을 저지방 육제품 제조에 적용하였으며 제조한 저지방 소시지의 pH는 6.29~6.34, 수분 74~76%, 지방<3% 및 단백질 15~18%인 반면, 유화형 소시지는 pH 6.51, 수분 56%, 지방 26.9% 및 단백질은 13.2%이었다. 친수성 콜로이드를 단독으로 첨가한 저지방 처리구는 무첨가구와 비교할 때 가열수율, 보수력 및 색도에 영향을 미치지 않았으나, CN을 첨가한 처리구의 보수력은 유화형 대조구와 KF 및 LBG를 각각 단독으로 첨가한 처리구에 비하여 오히려 낮았다. 물성특성에서는 저지방 대조구와 CN을 첨가한 저지방 처리구가 유화형 대조구보다 탄력성 및 응집성이 높았고, KF와 LBG를 각각 첨가한 처리구는 부서짐성과 경도 및 탄력성이 낮았다. KF, CN 및 LBG의 2종 내지 3종을 복합으로 첨가하여 저지방 소시지를 제조하였을 때 유화형 대조구에 비하여는 보수력은 떨어졌으나, KF와 LBG(KLL) 및 KF와 CN과 LBG(KCL)를 복합으로 첨가한 처리구는 단독 첨가구에 비하여 보수력이 증진되었다. 물성적인 특성에 있어서는 KF와 LBG를 혼합하여 첨가한 처리구를 제외하고 다른 혼합 첨가구는 유화형 대조구와 비교적 유사한 물성적인 성상을 가졌으며 그 중 KF와 CN의 복합처리구가 유화형 대조구와 가장 유사한 물성을 가졌다. 이상의 결과에서 볼 때 기존의 유화형 대조구와 유사한 물성을 갖는 저지방 소시지를 개발하기 위하여 친수성 콜로이드의 단일첨가보다는 보수력이 좋은 KF 혹은 LBG 등과 경도를 높여 주는 CN과 의 복합지방대체제의 첨가가 더욱 효율적임을 알 수 있었다. This study was performed to develop low-fat comminuted sausages (LFSs, <3%) manufactured with 1% single (Konjac flour, KF; kappa-carrageenan, k-CN and Locust bean gum, LBG) or mixed hydrocolloids and to select the best combination which had similar textural characteristics to those with regular-fat (~25% fat) control. In experiment 1, LFSs were formulated with each 1% hydrocolloid, smoked and cooked to an internal temperature of 71.7℃. The pH range of LFSs was 6.29 to 6.34 and approximately 23~24% of fat was removed in the final products, resulting in the higher moisture and protein contents (%) in LFSs, as compared to regular-fat control. No differences (p>0.05) in cooking loss (CL, %), expressible moisture (EM, %), and hunter color values (L, a, b) were observed with the addition of each 1% hydrocolloid. However, LFSs containing 1% k-CN had textural hardness values similar to those with low-/regular-fat controls, whereas LFSs having either KF or LBG had similar cohesiveness values to those with regular-fat counterpart. In experiment 2, two or three mixed hydrocolloids were added to the low-fat sausage formulation. The addition of mixed KF+LBG (KLL) and KF+CN+LBG (KCL) reduced EM and textural hardness values, as compared to low-fat control. Among the treatments, LFSs containing two or three combinations of CN with KF or/and LBG had similar textural characteristics to those with regular-fat control. These results suggested that multiple addition of CN with other hydrocolloids (KF or LBG) for the replacement of fats in LFSs would be recommended for the proper functional and textural properties.