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複合非破壞試驗法을 利用한 現場콘크리트 强度推定에 關한 硏究
조철희,김하진,이승엽,김정섭 朝鮮大學校 建設技術硏究所 1999 建設技術硏究 Vol.19 No.1
This study is to improve the reliability of compressive strength estimation using combined non-destructive testing method in estimating the compressive strength of in-situ concrete after 730 days of age, measures the values of compressive strength and non-destructive test of in-situ concrete with the combined strength of 240kg/㎠, conducts the experiment for estimating the compressive strength, makes the estimation expression of the results through simple and duplicate regressive analysis and then the results of comparing and analyzing to existing expressions to secure the range of application of estimation expression and its reliability are as follows. It is found that the positive curing is very important in the early curing of the strength revelation in long-term age and especially in hydrate and it is considered that the formation and application of estimation expression of comprressive strength according to placement and curing method are needed to enhance the degree of strength estimation of in-situ concrete. After 365 days of age, the compressive strength of concrete tends to be decreased. While the single method has not a great change of non-destructive test value according to the change of concrete strength, the combined method shows a high reliability and then it is appropriate to use it for the exact strength estimation. Existing estimation expression used for estimating the compressive strength indicates a high estimation error in comparison with the expression suggested by this research in the difference of materials used, combined strength of concrete and the difference of placement and curing methods. Accordingly, it will be desirable to use an estimation expression suitable to the in-situ conditions for the exact strength estimation. The estimation expression of compressive strength using combined non-destructive test method of in-situ concrete on 730 days of age (2 years) suggested by this research is as follows. Air Curing fc' = 7.33R+219Vp-846 [R-sq(adj) = 0.839, N=81] Water Curing fc' = 12.6R+176Vp-805 [R-sq(adj) = 0.839, N=81]
경영시스템 도입 중소기업의 품질이행율 향상을 위한 품질기록 관리운영의 표준화 사례연구
조철희,박병화,박진이 한국품질경영학회 2019 품질경영학회지 Vol.47 No.4
Purpose: In an infinite market competition, companies are adopting management systems to gain a competitive advantage. The expectancy effect of the management system is management performance improvement and accurate measurements. These can be made through quality records with integrity and maintainability. This paper examines the operation of records management standards, which are records, storage and management standards for quality records to understand the needs of records management standards and empathize with their needs. Methods: This paper examines PEC’s (Pields Engineering Co., Ltd.) specific processes and standards for integrating individual management systems and establishing records management standards. We also look at the specific features of the Search Tool and Document Storage Management Standards that support records management standards. Results: The integration process of PEC's individual management system consists of five steps. A PDCA-based process was established to erode the confusion and inefficiencies caused by overlap between individual management systems. Also, by accurately grasping corporate competence, PEC established a record management standard suitable for the characteristics of the company. PEC's records management standards are used as a useful standard for organizing quality records, and have an impact on management performance improvement. Conclusion: PEC's records management standards enable the verification of quality performance rates and performance measures. Companies can implement appropriate quality improvement strategies based on the numbers identified by introducing records management standards. Companies can succeed in improving management performance when operating quality management that combines performance measurement techniques and records management standards.
조철희 한국막학회 2016 한국막학회 총회 및 학술발표회 Vol.2016 No.05
제올라이트 분리막은 알루미나 등 다공성 지지체 표면에 3차원적으로 서로 연결된 주기적인 미세기공을 갖는 제올라이트 층을 치밀하게 코팅한 복합 소재 이다. 현재 LTA, FAU, CHA, MOR, DDR 제올라이트 분리막이 투과증발 분야에서 상업화되었고 이는 PVA 판형 막에 비하여 현저한 물 투과도와 물/알코올 선택도를 갖기 때문이다. 국내의 경우도 충남대와 (주)파인텍 연구팀이 성공적으로 LTA, CHA 제올라이트 분리막을 연구하고 그 막모듈과 시스템을 상용화하였다. 본 발표에서는 국내외 제올라이트 분리막 개발 및 응용 동향을 소개하고, 특히 제올라이트 분리막이 투과증발 및 증기투과 분야에서 적용할 수 있는 유망 분야에 대하여 논의하도록 한다.