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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.
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.
수중 콘크리트 구조물을 위한 광물질 혼화제를 첨가한 수중불분리성 콘크리트의 특성
원종필 ( Won Jong-pil ),임경하 ( Lim Kyung-ha ),박찬기 ( Park Chan-gi ),김완영 ( Kim Wan Yong ) 한국농공학회 2002 韓國農工學會誌 : 전원과 자원 Vol.44 No.6
Recently the use of the antiwashout underwater concrete with the antiwashout admixture is increased considerably. Antiwashout underwater concrete is quite different in concept from conventional underwater concrete. By mixing an antiwashout admixture with concrete, the viscosity of the concrete is increased and its resistance to segregation under the washing action of water is enhanced. The aim of this research is to evaluate the fundamental characteristics and permeability of antiwashout underwater concrete with fly ash and blast-furnace slag. Test Results of antiwashout underwater concrete with fly ash and blast-furnace slag fluence can provide its excellent fundamental characteristics and resistance of permeability.
실리카퓸 및 메타카올린 치환률에 따른 고강도 콘크리트와 탄소섬유보강 폴리머 보강근의 부착거동
박찬기,원종필,김종옥,Park, Chan-Gi,Won, Jong-Pil,Kim, Jong-Ok 한국농공학회 2008 한국농공학회논문집 Vol.50 No.5
This study is to relate the bond characteristics of CFRP rebar in high strength concrete incorporated with silica fume(SF) and metakaolin(MK). An direct bond test were performed to evaluate the effect of SF and MK on bond properties of high-strength concrete and CFRP rebar. The high strength concrete mix included four SF and MK mixes with 0%, 5%, 10% and 15%. Results of bond performance experiment in relation to pullout vs slip behavior of FRP rebar and high strength showed better performance of SF than MK. Also, the results showed the improved bond strength as replacement ratio of SF and MK increased. The relative bond strength in which $1.3{\sim}3.2$ of estimated values were obtained.
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.