• Journal of the Korean Recycled Construction Resources Institute
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• v.2 no.2
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• pp.145-151
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• 2014

This paper evaluated the quality properties of Finex Water Granulated Slag fine aggregate as part of a study to recycle the Finex Water Granulated Slag generated in korea, and examined the availability as fine aggregate for concrete by comparing properties (properties of fresh concrete, mechanical properties of hardened concrete) of concrete using Finex Water Granulated Slag fine aggregate with properties of concrete using river sand as fine aggregate. From the results of this study, it was found that quality properties of concrete using finex water granulated slag as fine aggregate and concrete using river sand as fine aggregate are equivalent level.

• Journal of the Korean Recycled Construction Resources Institute
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• v.7 no.4
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• pp.79-87
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• 2012

Recently, Development of substitution aggregate is urgently needed because aggregate shortage is continuing due to the exhaustion of natural aggregate and strict restrictions of environment in construction industry. Therefore, This paper was examined the fundamental properties for application of FINEX slag by finex process as fine aggregate for concrete. Through this study, we propose the practical method of FINEX slag as fine aggregate for concrete.

• Journal of Korea Technology Innovation Society
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• v.13 no.4
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• pp.700-716
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• 2010

This paper examines the development of smelting reduction process in POSCO from 1990 to 2007 with the perspective of post catch-up technological innovation. POSCO paid attention to smelting reduction process as a sort of next-generation iron and steel technology, and implemented COREX (coal ore reduction) by the cooperation with V$\"{o}$oest. In addition to this, POSCO started to develop FINEX (fine iron ore reduction) which can use abundant powder ore, and FINEX was developed through model plant, pilot plant, demo plant, and commercial facility. POSCO came up to innovation leader beyond fast follower by securing almost technologies concerning FINEX. The case of smelting reduction process shows various characteristics including appropriate technological choice, successive scale-up, spiral development system, complementary technological cooperation, long-tenn investment, the existence of top management's leadership, and Korean government's support in early stage. This case can be interpreted as a path-revealing innovation in the middle of technological paradigm change.

• The Science & Technology
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• no.12 s.451
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• pp.28-30
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• 2006

• Journal of the Korea Concrete Institute
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• v.22 no.3
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• pp.375-380
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• 2010

In this study, physical properties of cement blended with Finex-slag powder(OPC-FS) were investigated by the measurement of flowability, compressive strength, hydration heat, and $Ca(OH)_2$ content. In addition, those properties of the cement blended with blast furnace slag(OPC-BFS) were also measured for comparison. It was found that OPC-FS and OPC-BFS showed similar trend in the rheological properties. In the blended cement pastes with the $4,000\;cm^2/g$ Blaine value the flowability of OPCFS was better than that of OPC-BFS. The initial 3 day mortar compressive strength and the hydration heat of paste of OPC-FS was a bit higher, compared with OPC-BFS. Accordingly $Ca(OH)_2$ produced in the cement hydration was decreased very rapidly.

• Journal of the Korean Ceramic Society
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• v.46 no.6
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• pp.657-661
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• 2009

In this study, rheological properties of cement pastes containing ground Finex-slag (4000, 6000, 7000 c$m^2$/g) were investigated bymini-flow test and coaxial cylinder viscometer. And also blast furnace slag(4000, 6000, 7000 c$m^2$/g) were used for comparison. According to the experimental results, Finex-slag and blast furnace slag showed very similar trend in the rheological properties of the cement pastes. The fluidity of cement pastes blended Finex-slag and blast furnace slag powder were improved by high replacement ratio. In the relationship of plastic viscosity and yield stress appeared the tendency of the proportion greatly. And in the relationship of plastic viscosity, yield stress and mini-flow appeared the tendency of the inverse proportion.

• Journal of Korea Technology Innovation Society
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• v.12 no.1
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• pp.237-264
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• 2009

Many Korean companies wanted to improve technological competitiveness and business performance radically through technology leadership initiatives. In-depth case studies about successful Korean technological innovation in the technology generation stage have potential to minimize Korea and developing country firms' trial and error when they are pursuing new technological innovation in the technology generation stage. There are few studies about developing country firms' technological innovations in the technology generation stage and especially process innovation studies are far less performed compared to product innovation studies. This is an exploratory study of POSCO's FINEX process technology innovation in the technology generation stage. These are my findings from this study. Firstly, leadership innovation in the technology generation stage is not a continuous development of catch-up innovation in the technology internalization stage and only top managements can initiate highly risky leadership innovation. Secondly, developing country firms which lacked in technological capability overcomes difficulties in the early stage through complementary technological collaboration with R&D first-movers. Thirdly, this company become a technology leader in spite of late entry in technology development race with developed country firms through rapid scale-ups.

• Journal of KSNVE
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• v.2 no.1
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• pp.15-20
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• 1992

(1) 화약발파작업을 시작하기 전에는 필히 시험발파, 안전진단을 통해 공해 및 안전사고 발생요소들을 면밀히 분석하고 파악하여 발파공법, 천공공법, 사용폭약 의 종류, 사용약량 등을 결정하고 이에 따른 적합한 안전거리의 설정, 안전덮게, 안전망의 사용, 필요시 휀스철망 설치등의 안전조치를 완벽히 취해야겠다. 또한 현행 소음진동규제법에 의하면 폭약 사용시 7일전 신고의무 규정을 우리나라의 공사 현실을 감안해 볼 재검토 할 필요가 있다. (2) 선진국의 발파진동 기준을 우리나라 의 경우와 비교 분석해 볼때 우리나라의 경우 발파진동 안전기준은 도심지에는 대체 로 0.5cm/sec가 적당하고 고주택, 아파트 등이 밀집된 지역이나 건물지반이 특히 약한 곳은 0.2cm/sec을 적용함이 타당하다고 판단된다. 또한 도심지에서의 안전발파 를 위한 터널공법으로는 주변 생활환경 소음진동방지를 위한 심발법으로 브이 컷법 을, 여굴방지와 미려시공 등 공사시 안전사고, 소음진동을 방지하기 위한 공법으로는 슬러리, 파이 넥스 폭약을 이용한 정밀면 발파법을 권장한다. (3) 연화발사시 안전 거리를 3.deg. 기준 최소반경 129m, 12" 기준 최고 반경 200m로 설정하여야 겠다. 또한 연화발사시 발생하는 폭발 소음은 80 - 100dB 정도로써 대량으로 장시간 발사 시는 청력장해 등의 피해가 발생할 수 있으나 우리나라의 경우는 발사 총 시간이 대체로 30분을 초과하지 않으므로 관람자나 일반인들이 소음피해를 호소할 수준은 아니라고 결론지을 수 있다.수 있다.