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메틸 메타크릴레이트 기반 도로 보수재 개발을 위한 기초 연구
지성준,편수정,최병철,김재환,김도수,남정수 한국건축시공학회 2024 한국건축시공학회지 Vol.24 No.1
본 연구에서는 도로 보수재로서 메틸 메타크릴레이트(MMA)의 활용 적합성을 평가하였다. A type과 B type의 2가지MMA를 콘크리트에 적용하여 건조시간, 인장 접착 강도, 내알칼리 시험을 진행하였다. 항온항습(R), 수중(W), 수중+염화이온(N)의 3가지 조건으로 양생하여 모체의 표면 상태를 설정하였다. 시험 결과, B type MMA가 A type 보다 빠른 건조시간과 우수한 내알칼리성을 나타냈다. 인장 접착 강도는 A type이 더 높게 나타났지만, 콘크리트 모체와 함께 탈락되었다. 본 연구 범위에서는 B type이 도로 보수재로 사용하기 적합하다고 판단된다. 그러나 내구성을 고려하여 아스팔트 모체에서의 추가 실험을 진행할 필요가 있다.
지성준,차용운,한상원,Chi, Sungjoon,Cha, Yongwoon,Han, Sangwon 한국건설관리학회 2015 건설관리 : 한국건설관리학회 학회지 Vol.16 No.2
공사비 증가와 공기 지연 등 건설프로젝트에 악영향을 미치는 건설품질결함은 지속적으로 발생하고 있다. 그간 결함을 유발시키는 원인들을 규명하기 위한 연구는 다수 있었으나, 원인들 간의 상관관계를 분석한 연구는 충분히 이루어지지 않았다. 본 논문에서는 국내 30개 프로젝트에서 발생한 1,241건의 부적합 사례 중 831건의 건축공종 부적합 사례를 토대로 건설품질결함의 발생요인을 발생단계, 발생현상, 기인원인, 처리방안으로 나누어 이들 간의 상관관계를 분석하고자 한다. 상관분석을 통해 부적합은 주로 조달 및 시공단계에서 기능결함 및 시공결함의 형태로 발생함을 알 수 있었다. 주로 작업자의 실수, 조악한 품질의 자재사용, 그리고 잘못된 시공방법에 의해 발생되는 품질결함은 주로 특채, 수리, 재작업의 방법으로 처리되어 공사비 증가 및 공기 지연을 가져옴을 알 수 있었다. 본 논문은 향후 품질결함의 발생과정을 규명하고 효율적인 품질결함 방지대책을 수립하는 데에 있어 중요한 이론적 배경과 정량적 지표를 제공했다는 데 그 의의가 있다. Construction defects are major components that result in cost overruns and schedule delays in construction projects. There have been extensive research efforts to investigate the cause of defects. However, little effort has been devoted to analyze correlation among various reasons of construction defects while a defect is not usually an outcome of a single cause, but rather occurs when several interrelated causes combine. Based on this recognition, this paper analyzes 831 nonconformity reports collected from 30 construction projects in Korea from 2011 to 2014. The correlation analysis revealed that a significant portion of construction defects occurred in the procurement and construction phase and as the pattern of function defect and installation defect. Triggered by human error, defective material and faulty method, these defects are treated by conccession, repair, rework that can significantly lower the cost and schedule performance. This paper is significant in terms of providing a theoretical basis for analyzing correlation among various reasons of construction defects and quantitative measures for establishing effective defect prevention strategies.
어류 알의 Protease Inhibitor 활성 분포
지성준 ( Seong Jun Ji ),이지선 ( Ji Sun Lee ),신준호 ( Joon Ho Shin ),박권현 ( Kwon Hyun Park ),김진수 ( Jin Soo Kim ),김경섭 ( Kyoung Sub Kim ),허민수 ( Min Soo Heu ) 한국수산과학회(구 한국수산학회) 2011 한국수산과학회지 Vol.44 No.1
To identify and examine the distribution of proteolytic inhibitory activity in crude extracts from fish eggs, and to determine the applicability of these protease inhibitors as anti-degradation agents in surimi-based products and fish meat, we compared the inhibitory activities of various extracts from fish eggs to those of commercial proteases, such as trypsin and papain. We used the optimal conditions for the screening of trypsin activity: 30 ug/uL of 0.1 % trypsin and 0.6 mM Na-benzoyl-L-arginine-p-nitroanilide (BAPNA) with a pH of 8.0 at 40℃ for 60 min. The activities of papain and four commercial proteases were investigated after mixing with 100 ug/uL enzymes and 0.3% casein with a pH of 8.0 at 40℃ for 60 min. We performed a screening assay to detect the inhibitory activity (%) of crude extracts from eight species of fish eggs against the target proteases trypsin and papain. The assay revealed a wide distribution of trypsin and papain inhibitors in fish eggs. The specific inhibitory activities (11.6-28.6 U/mg) of crude extracts from fish eggs against trypsin and BAPNA substrate were higher than that (0.64 U/mg) of egg whites, used as a commercial inhibitor. The inhibitory activities of crude extracts from fish eggs against trypsin, and of egg whites against casein substrate (1.94-4.51 U/mg), were higher than those of papain (0.24-1.57 U/mg) and commercial protease (0.04-0.32 U/mg). The extracts from fish eggs were rich in protease inhibitors that exhibited strong inhibitory activity against trypsin, a serine protease, and papain, a cysteine protease.
안료를 혼입한 고강도 시멘트 복합체의 강도 및 색상 발현의 관계특성
지성준 ( Ji Sung-jun ),김규용 ( Kim Gyu-yong ),편수정 ( Pyeon Su-jeong ),최병철 ( Choi Byung-cheol ),김문규 ( Kim Moon-kyu ),남정수 ( Nam Jeong-soo ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.1
Recently, the construction industry has seen the emergence of interior and exterior finishes using ultra-high performance concrete (UHPC) and colored concrete products using precast concrete (PC). However, the excessive amount of pigment used for coloring reduces the strength of the concrete. There is a need to improve the durability and chromaticity of colored concrete, and further analytical studies on the properties of colored concrete are also required. Therefore, in this paper, colored ultra-high strength cement composites (C-UHSCC) containing red and green inorganic pigments were prepared, and the compressive strength and color of the specimens were measured according to the age, and the correlation between strength and color was analyzed by simple linear regression analysis using R<sup>2</sup> value. The results showed that the red color was highly correlated with L* and a*, and the green color was highly correlated with a*. These results can be considered for various concrete formulations, but research is needed to suggest the optimal pigment mixing ratio for proper strength and color development.
Methyl Methacrylate(MMA)계 도로보수재의 인장 접착 강도 평가
지성준 ( Ji Sung-jun ),김규용 ( Kim Gyu-yong ),편수정 ( Pyeon Su-jeong ),최병철 ( Choi Byung-cheol ),박준영 ( Park Jun-young ),남정수 ( Nam Jeong-soo ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.2
In this study, the tensile adhesion strength was evaluated according to KS F 4932 to assess the suitability of MMA-based repair materials for concrete roads. Two types of MMA were used. Mortar mock-ups were made and tested for adhesion strength in three different surface conditions: air, water, and salt water. Both showed strengths above the standardized strength of 0.6 MPa. Type B, which has a relatively low adhesion strength, is considered more suitable.
지성준(Ji, Sung-Jun),김정은(Kim, Jeong-Eun),박완신(Park, Wan-Shin),김선우(Kim, Sun-Woo),윤현도(Yun, Hyun-Do) 한국콘크리트학회 2021 한국콘크리트학회 학술대회 논문집 Vol.33 No.2
최근 Carbon-FRP (CFRP) 그리드로 보강된 철근콘크리트 보의 전단강도 보강에 대한 연구가 국내외적으로 활발하게 진행되고 있다. 본 연구에서는 CFRP 그리드로 보강된 철근콘크리트 보에 대한 기존 문헌분석을 통해 철근콘크리트 보의 전단성능을 고찰하고자 한다. Carbon-FRP (CFRP) grid was one type that was commonly used in engineering and has shown results in shear strengthening of reinforced concrete beams. The objective of this study is to investigate shear capacity of reinforced concrete beams with CFRP based on the observation experimental data in previous researcheres.
Characterization of Acid- and Pepsin-soluble Collagens from Rockfish Sebastes schlegeli Skin
김형준,지성준,윤민석,연무호,강경태,이동호,허민수,김진수 한국수산과학회 2009 Fisheries and Aquatic Sciences Vol.12 No.1
Biochemical and functional properties of acid-soluble collagen (ASC) and pepsin-soluble collagen (PSC) from rockfish skin were characterized. Yield of PSC (90.0%) was higher than that of ASC (63.2%). Both ASC and the PSC consisted of α1 and α2 chains, and α -cross-linked components. According to the results of hydroxylation of proline and lysine, and FT-IR, no difference between the helical structure of ASC and PSC was identified. Thermal denaturation temperature (TDT) of ASC from rockfish skin was 22.8°C, the same as exhibited in PSC. Both ASC and PSC were higher in water absorption capacity (WAC) and oil absorption capacity (OAC) than other vegetable proteins. According to the results of emulsifying activity (EA) and cooking stability (CS), both ASC and PSC from rockfish skin were inferior compared to the commercial emulsifier (Tween-80). The results of FT-IR suggested that the structure of PSC was slightly different when compared to that of ASC. No differences in solubility were established between ASC and PSC from rockfish skin at various pH and NaCl concentrations.