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IoT기반 철도 화차 안전운송 통합 품질관리시스템에 관한 경제성 평가지표 분석
원종운 ( Jong-un Won ),윤치호 ( Chiho Yoon ),박상찬 ( Sang-chan Park ) 한국품질경영학회 2016 품질경영학회지 Vol.44 No.4
Purpose: The objective of this study is to verify the economic validation of quality management integrated train freight car by analyzing economic evaluation indicators such as benefit and cost, net present value, and inter rate of return. Methods: First, we itemize benefit and cost field by reviewing literatures; Benefit consists of 1)Safety, 2)Operation, and 3)Maintenance; Cost consists of 1)Set-up fee, 2)Wireless internet fee, and 3)Cloud storage using fee. Second, based on these estimated values, we conduct an economic evaluation analysis. Among them, benefit and cost, net present value, and internal rate of return are selected. Results: As a result, all estimated values are highly over criterion of economic validity(B/C?1, NPV?0, IRR? R); 1)benefit over cost ratio is 28.22, 2)Net present value is 8,121.66million KRW, and 3)Internal rate of return value is 2272%. Conclusion: The findings of this study will help making a decision when train industry adopts IoT technology for improving the effectiveness.
박찬기 ( Park Chan Gi ),원종필 ( Won Jong Pil ) 한국농공학회 2003 韓國農工學會誌 : 전원과 자원 Vol.45 No.2
Over the last decade fiber-reinforced polymer (FRP) reinforcement consisting of glass, carbon, or aramid fibers embedded in a resin such as vinyl ester, epoxy, or polyester has emerged as one of the most promising and affordable solutions to the corrosion problems of steel reinforcement in structural concrete. But reinforcing rebar for concrete made of FRP rebar has linear elastic behavior up to tensile failure. For safety a certain plastic strain and an elongation greater than 3% at maximum load is usually required for steel reinforcement in concrete structures. The same should be required for FRP rebar. Thus, the main object of this study was to develop new type of hybrid FRP rebar Also, this study was evaluated to the mechanical properties of Hybrid FRP rebar. The Manufacture of the hybrid FRP rebar was achieved by pultrusion, and braiding and filament winding techniques. Tensile and interlaminar shear test results of Hybrid FRP rebar can provide its excellent tensile strength-strain behavior and interlaminar stress-strain behavior.
고추밭 잡초 피와 명아주 발생밀도에 따른 경합 및 고추 수량 감소
원종건(Jong Gun Won),장길수(Kil Su Jang),황지은(Ji Eun Hwang),권오훈(Oh Hun Kwon),전수경(Su Gyung Jeon),박상구(Sang Gu Park) 韓國雜草學會 2011 Weed&Turfgrass Science Vol.31 No.1
본 시험은 2010년에 경상북도 농업기술원 영양고추시험장 고추 재배포장에서 밭 잡초로 가장 문제시 되고 있는 잡초 중 피와 명아주를 대상으로 잡초밀도별 고추와의 경합력을 구명하고 rectangular hyperbola 모델을 기초로 잡초의 밀도에 따른 건고추 수량 감소를 예측하여 경제적인 방제 필요수준을 구명하고자 실시하였다. 잡초를 완전 방제 했을 경우를 가상한 건고추 수량은 명아주에서 10a 당 323.2kg으로 피의 317.0kg 보다 다소 높았으며, 고추와 잡초의 경합력은 명아주에서 0.29으로 피의 0.1707 보다 높았고, 수량 예측식은 명아주가 y=323.2 kg/(1+0.29x), R²=0.896, 피가 y=317.0 kg/ (1+0.1707x), R²=0.895로 나타났다. 제초제 구입 비용을 10a당 6,500원, 제초제 살포 인건비를 20,000원, 건고추의 가격을 kg당 8,000원, 제초제 방제가 95%로 적용하여 구한 경제적 피해 한계 밀도는 잡초 완전 방제시 수량이 10a당 323.2kg이고 잡초 1본당 수량 감수 정도가 0.29인 명아주는 100㎡당 3.7본, 잡초 완전 방제시 수량이 317.0kg이고 잡초 1본당 수량 감수 정도가 0.1707인 피는 100㎡당 6.5본이었다. This study was conducted to predict the yield loss of red pepper and to determine the economic weed thresholds levels for red pepper cultivation field from competition with the most serious weeds, Echinochlor crus-galli (L.) P. beauv. (barnyard grass) and Chenopodium album L. (goosefoot) in Youngyang of Korea. Crop yield as a function of weed density was predicted by using a rectangular hyperbola, and their economic threshold levels were determined by using the equation developed by Cousens (1987). The red pepper yield loss models of weeds were predicted as y=317.0 kg/ (1+0.1707x), R²=0.895 in E. crus-galli and y=323.2 kg/(1+0.2900x), R²=0.896 in C. album L.. Economic thresholds calculated using Cousens" equation was negatively related with the competitiveness of weed. Economic thresholds of each weed were calculated as 6.5 plant 100 m-2 in E. crus-galli, and 3.7 plant 100 m-2 in C. album L.
Crimped Type 합성섬유로 보강된 시멘트 복합재료의 부착, 휨 및 소성수축균열제어 특성
원종필(Won Jong Pil),박찬기(Park Chan Gi),임동휘(Lim Dong Hee),백철우(Back Chul Woo) 대한토목학회 2006 대한토목학회논문집 A Vol.26 No.6A
본 연구의 목적은 1.8㎜의 높이와 6㎜의 주기를 가지고 있는 crimped type 합성섬유로 보강된 시멘트 복합재료의 부착 및 휨특성과 소성수축균열제어 특성을 평가하는 것이다. 부착 및 휨 시험은 JCI SF-4 및 JCI SF-8에 의해서 실시하였고, 소성수축균열시험은 시멘트 복합재료의 소성수축균열의 감소에 영향을 미치는 섬유의 효과를 평가하기 위하여 실시하였다. 실험결과 crimped type 합성섬유는 직선형태의 섬유와 비교하여 부착하중 및 계면인성이 우수하였고, 콘크리트의 휨인 성을 증가시켰다. 또한 crimped type 합성섬유는 섬유의 혼입율이 0.00%에서 1.00%로 증가함에 따라 소성수축균열 저항성이 증가하였다. 특히, 섬유의 혼입율이 0.50% 이상이 되면 소성수축균열 조절능력이 매우 우수하였다. The purpose of this study are to evaluated bond, flexural properties and control of plastic shrinkage cracking of crimped type synthetic fiber with amplitude 6㎜ and height 1.8㎜ reinforced cement based composites. Bond and flexural test were conducted in accordance with the JCI-SF 8 and JCI SF-4 standard, respectively. The plastic shrinkage cracking test was conducted for evaluating the effect of fiber in reducing shrinkage cracking in cement based composites. Test results indicated that the crimped typel synthetic fibers performed significantly better than the straight type fiber in terms of interface toughness and pullout load and the crimped type synthetic fibers improved the flexural toughness of concrete. Also, the increasing the crimped type synthetic fiber volume fraction from 0.00% to 1.00% improved the plastic shrinkage cracking resistance. Specially, the effect of control of plastic shrinkage cracking is excellent at the more than 0.5% fibre volume fraction.
시멘트 매트릭스 내에서 폴리올레핀계 합성섬유의 친수성처리에 따른 인발거동
원종필(Won Jong-Pil),박찬기(Park Chan-Gi),김윤정(Kim Yun-Jeong),이시원(Lee Si-Won) 대한토목학회 2007 대한토목학회논문집 A Vol.27 No.3A
본 연구에서는 숏크리트 및 콘크리트을 포함한 시멘트 복합재료에 적용하기 위한 폴리올레핀계 합성섬유의 부착성능을 향상시키기 위한 연구를 실시하였다. 이를 위하여 첫 번째로 폴리올레핀계 합성섬유의 부착성능 문제점을 해결하기 위하여 섬유의 모양을 원주형에서 절곡형(crimped type)으로 변화시켰다. 두번째로 폴리올레핀계 합성섬유의 표면을 친수성처리하여 인발실험을 통하여 친수성 효과를 평가하였다. 실험결과 섬유의 형상변화는 시멘트 복합재료와 폴리올레핀게 합성섬유의 부착성능을 크게 향상시킬 수 있었다. 특히 부착강도보다는 인발에너지에서 효과가 더 크게 나타났다. 친수성 처리에 따른 부착성능의 향상은 mPP의 농도가 15%일 때 가장 성능이 우수하게 나타났다. 이는 폴리올필레핀계 섬유 표면의 코팅율과 관계가 있는데 mPP의 농도가 15%일 때 100%에 가까운 친수성 처리율을 나타내어 이와 같은 결과를 보여주었다. 이와 같은 결과는 인발실험 후 섬유의 표면관찰을 통하여 확인할 수 있었다. This study peformed the test for increasing the bond performance of polyolefin based synthetic fiber in order to apply to cement based composite including shotcrete and concrete. In the first process, in order to solve the problem of bond performance of polyolefin based synthetic fiber, this study was changed the shape of fiber into crimped type from smooth cylinder type. Secondly, this study evaluated hydrophilic surface treatment effect of polyolefin based synthetic fiber through pullout test. Test results were showed that the change of fiber shape could increase the bond performance of cement matrix and the polyolefin based synthetic fiber. Especially, more effect was obtained in pullout energy rather than in bond strength. The improvement of bond performance with hydrophilic treatment rate showed its best performance when the concentration of mPP was 15%. This is related with the coating rate on the surface of polyolefin based synthetic fiber, which was proven in the result that when the concentration of mPP is 15%, it showed almost 100% of hydrophilic surface treatment rate. This result could be confirmed through the observation of fiber surface after pullout test.