The objective of this study is to calculate flow characteristics and structural safety for triple offset eccentric butterfly valve. The triple offset butterfly valve used in this study was 600mm in size, and the opening angles were 30 degree, 60degree and 90 degree. Structural and flow analysis of triple offset eccentric butterfly valve are carried out by using commercial code ANSYS and CFX version 14. The flow coefficient, Kv, increases as the valve opening increases. The results from fluid structure coupled analysis, maximum equivalent stress was calculated 462.06MPa at opening angle 60 degree

본 연구에서는 단무지 가공초기인 탈염과정에서 온도변화(5oC, 25oC) 및 CaCl2 첨가(0.6%, w/w) 유무가 탈염 단무지의 품질에 미치는 영향을 조사함으로서, 단무지 품질 변화를 최소화 할 수 있는 기초자료를 제공하고자 하였다. 5oC에서 탈염한 경우 25oC 탈염과 비교하여 탈염기간이 증가하였으며, 특히 탈염기간 후반부에 상대적으로 탈염속도가 늦어지는 것으로 나타났다. 미생물(위생)적 측면에서 5oC 탈염이 바람직하였으며, 탈염시 CaCl2 첨가가 단무지의 총균수를 감소시키지는 않았다. pH 변화의 경우 5oC 탈염에서 감소폭이 적었고, 색깔의 경우 탈염기간동안 전반적으로 큰 변화는 나타나지 않았다. 조직감(굳기)은 5oC에서 CaCl2 처리하지 않고 탈염한 단무지에서 변화(감소)가 가장 적었으며, 25oC, CaCl2 처리한 탈염단무지에서 가장 큰 변화(감소)가 나타났다. 미세구조를 관찰한 결과, 탈염과정에서 CaCl2 처리 시 공극이 커져 구조가 상대적으로 엉성해 짐을 확인하였으며, 온도차에 의한 미세구조차이는 육안으로 구별할 수 없었다. 관능검사결과, 조직감 측면에서는 CaCl2 처리하여 탈염한 단무지를 다소 선호하였으나 비처리시료와 유의적 차이는 나타나지 않았다.

Benzotriazole (B.T.A) which has been mainly used for the stabilization processing method of excavated copper and bronze artifacts is vaporized within 2~3 years after the usage because it is unstable at the acid conditions and cannot protect the surface of artifacts. In this study, NaOH method which has been used for the steel artifacts was applied as a stabilization process for the method of copper and bronze artifacts to gush chlorine ion out. For the reproduction of excavated samples, copper and bronze plates were dipped in 0.1M HCl for 26 hrs to form CuCl, rusted at 70˚C with RH 75% for the formation of corrosion products, and desalted in 0.1 M NaOH solution. The concentration of chlorine ion was measured by using ionchromatography. During the desalting process, a large quantity of chlorine ions was gushed out in early period and corrosion products were not additionally generated through the re-corrosion experiment. This NaOH desalting process was found to be a method of stabilization process for copper and bronze artifacts from the formation of Tenorite (CuO) during desalting as a protection layer for corrosion.

본 연구에서는 정밀여과 및 나노여과 분리막 시스템을 활용하여 염료 제조 시 필요한 탈염/정제/농축처리 기술을 개발하고 그에 따른 염료의 품질과 품질의 안정성을 향상시키며, 기존공정의 단수를 축소하여 생산성 향상, 인력저감 및 원재료의 비용을 감소하고자 하였다. 염료의 탈염/정제/농축처리시 염료의 다양한 농도에 적합한 분리막의 제조 및 가압식 막 element를 제작하고, 가압식 분리막 시스템에 맞는 막 모듈의 설계와 pilot-scale 시스템을 통해 염료의 처리수질 분석 및 운전인자를 도출하였다.

To establish a new manufacturing process of low-salted fermented anchovy sauce, commercial fermented anchovy sauce with 23% NaCl was desalted using a spirit. The proximate composition, total nitrogen, amino nitrogen, Escherichia coli, and total and free amino acid contents were analyzed to evaluate the quality characteristics of commercial salted fermented anchovy sauce (CFAS) and low-salt fermented anchovy sauce by desalting processing (LFAS). The salinity of saltwater and fermented anchovy sauce decreased with an increase in the spirit added to 23% NaCl saltwater and 23% NaCl commercial fermented anchovy sauce. The total nitrogen and amino nitrogen contents were higher in LFAS than in CFAS. The major amino acids that were commonly found in CFAS and LFAS were glutamic acid, alanine, lysine and leucine. Basic data were provided for commodification research on low-salt fermented anchovy sauce, which is very important for the diet of humans.