• Proceedings of the Korean Society for Bio-Environment Control Conference
• /
• 1993.05a
• /
• pp.7-8
• /
• 1993

과채류의 생산에 있어서 육묘는 매우 중요하다. 육묘 시 묘의 생육에 미치는 요인은 다양하나 그 중 배양토는 가장 기본적인 요소가 된다. 배양토는 보수성이 좋고 균질, 무균이어야 할 뿐만 아니라 운송성, 이식성 등이 고려되어야 하며, 이·화학적 성질의 균일성이 필수적으로 요구된다. 이에 본 실험에서는 현재 외국에서 배양토로 많이 사용되고 있는 peatmoss(원예용상토), TKS, vermiculite, perlite 및 이들 인조 배양토에 밭흙ㆍ모래를 배합했을 시 물리ㆍ화학적 특성을 조사하고, 이들 배양토가 고추묘의 생육에 미치는 영향을 조사하였다. (중략)

• Magazine of the Korean Society of Agricultural Engineers
• /
• v.15 no.2
• /
• pp.3031-3038
• /
• 1973

The aggregate materials being scottored in districts of the country were investigated to provide the data to the Consturction worker who are working without quality tests of construction materials in the small scale land consolidation, farm building construction and new village Construction projects in the country. Also results of the survey will be helpful to those who want to devise a succerrful plan in concrete execution by means of specifying a standard and technical treatment of construction materials.

• Proceedings of the Korean Society of Grassland Science Conference
• /
• 1998.04a
• /
• pp.97-113
• /
• 1998

목적; 젖소의 자가혼합사료 생산 및 보급을 위한 시법사업, 사료비 및 노동력절감과 젖소의 우유생산성 증대 기본방침; 젖소의 새로운 사양관리모델 개발, 사료구입 및 공급체계 확립, 시법사업 추진결과에 따란 점차 확대 추진 사업내역 ; 사업내역-사료공급기지시설 1개소, TMR 배합소 8개소, 축산발전기금 융자총액-2,310,000천원, 융자조건-3년거치 7년상환, 년리3% 사업비 구분; 축발기금-토지구입자금을 제외한 소요사업비의 70% 자부담-30%.(중략)

• Feed Journal
• /
• v.4 no.3 s.31
• /
• pp.102-109
• /
• 2006

세계적으로 환경문제의 중요성이 심각하게 대두되고 있고, 그에 따른 관련법규도 강화되어 환경비용이 급속하게 증가하고 있으므로, 식품가공부산물 중에서 비교적 발생량이 많으면서 방치할 경우 환경문제를 야기할 가능성이 높은 맥주박, 비지, 주정박, 전분박 및 감귤박 등에 대한 사료가치 증진방안과 이 들을 원료로 한 한 · 육우에 대한 TMR 제조 및 이용기술을 제시함으로서 생산비절감을 기본으로 한 고급육 생산방안을 제시하고자 한다.

• KOREAN POULTRY JOURNAL
• /
• v.34 no.4 s.390
• /
• pp.104-106
• /
• 2002

미국이 자국내 철강제 수입에 대한 관세부과 조치가 세계적인 문제가 되고 있는 시점에서, 러시아에 수출되고 있는 미국산 닭고기에서 살모넬라 등 위생에 문제가 될 수 있는 병원균이 검출되었다는 보도를 미국은 무역보복조치로 해석하고 있어 무역전쟁을 실감케 하고 있다. 축산물에 대한 안전이 식품의 안전성에 직결된다는 의식을 갖고 있는 우리나라의 배합사료제조회사들은, 자발적으로 가축에게 급여하는 사료에 대한 안전과 위생관리를 위하여 ISO는 물론 까다로운 것으로 알려진 HACCP 제도를 도입하고 있다. 이러한 노력이 종합적이고 기본적인 단계에 해당하는 양계농가에서도 함께 진행될 때 더욱 효과적인 결과를 얻을 수 있으리라 생각되어 살모넬라에 대한 일본의 농가단위 위생대책을 소개한다.

• Journal of the Korea Concrete Institute
• /
• v.25 no.1
• /
• pp.11-18
• /
• 2013

Cement concrete pavement offers long-term service life and excellent applicability for heavy traffic. It is easier to purchase and more durable and economical than the asphalt pavement. However, it is difficult to repair and rehabilitate compared to the asphalt pavement when it comes to the maintenance problem. Since the crack is the main reason of the damage of concrete pavement, it is necessary to control the early and long-term crack in the concrete pavement. In this experimental study, the basic performance tests have been carried out to investigate the effect of hybrid fibers which were composed of micro fibers with small diameter and high aspect ratio and macro fibers with large diameter and low aspect ratio on the concrete pavement, in which lower water ratio and larger aggregates were used compared to the general concrete mixture. The test results showed that the flexural strength and toughness of concrete pavement mixture have been increased with the use of hybrid fibers in the concrete pavement mixture, even though they were less effective compared to the normal concrete mixture. It was found that the hybrid fibers were effective to control the early shrinkage of the concrete pavement which is one of the main reasons of the damage in the concrete pavement.

• Journal of the Korea Concrete Institute
• /
• v.21 no.5
• /
• pp.573-580
• /
• 2009

This paper presents the mix composition, production method, and curing condition applied to the extruded ECC(Engineered Cementitious Composite) panel which are able to exhibit multiple cracking and potential pseudo strain-hardening behavior. In addition to the production technique of extruded ECC panel, the effect of fiber distribution characteristics, which are uniquely created by applying extrusion process, on the flexural behavior of the panel is also focussed. In order to demonstrate fiber distribution, a series of experiments and analyses, including image processing/analysis and micro-mechanical analysis, was performed. The optimum mix composition of extruded ECC panel was determined in terms of water matrix ratio, the amount of cement, ECC powder, and silica powder. It was found that flexural behavior of extruded ECC panel was highly affected by the slight difference in mix composition of ECC panel. This is mainly because the difference in mix composition results in the change of micro-mechanical properties as well as fiber distribution characteristics, represented by fiber dispersion and orientation. In terms of the average fiber orientation, the fiber distribution was found to be similar to the assumption of two dimensional random distribution, irrespective of mix composition. In contrast, the probability density function for fiber orientation was measured to be quite different depending on the mix composition.

• Journal of the Korea institute for structural maintenance and inspection
• /
• v.23 no.2
• /
• pp.92-98
• /
• 2019

In general, high strength and high performance fiber reinforced cement composites exclude coarse aggregates basically in order to have homogeneous distributions of material properties. However, these fiber-reinforced cement mortar without coarse aggregate have a tenancy that the modulus of elasticity is low and the unit weight of cement is high, resulting in low economic efficiency. Therefore, in this study, the development of high ductile fiber - reinforced concrete was conducted, which has the adequate level of coarse aggregate but still retains the high flexural toughness and strength and also has the crack - distributing performance. Experimental study was carried out by using the amount of coarse aggregate as an experimental parameter. The results showed that the best flexural toughness and crack dispersion characteristics was obtained when the coarse aggregate was added at 25% by weight of the fine aggregate to the typical mixtures of high ductile cement mortar. PVA fiber was effective in crack distribution and ductility enhancement, and steel fiber was effective in strengthening flexural strength rather than crack distribution.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.26 no.4C
• /
• pp.265-273
• /
• 2006

This study aims at evaluation of the fire resistance performance of cementitious materials for fire protection of tunnel. For this purpose, the research procedure was divided into three parts. First, base mix proportion with different material type were determined by fire test. Second, the fire test of cementitious materials for fire resistance were performed on base mix proportions to evaluated their performance. Third, the performance of cementitious materials for fire resistance compare to the target value and existing commercial products. If the performance of developed cemetitious materials for fire resistance were satisfied the target value, this studies were stopped. But, this research return to first process if the performance of cementitious materials for fire resistance are not satisfied the target value. As a result of this study, the spalling did not happen for develop and existing commercial product. Also, developed cementitious materials for fire resistance are shown with excellent compressive strength, flexural strength, and bond strength, because it used a height density aggregate. And developed cementitious materials has sufficient resistance for fire.

• Journal of the Korean Recycled Construction Resources Institute
• /
• v.2 no.2
• /
• pp.137-144
• /
• 2014

The PHC pile utilizing the air-cooled blast-furnace slag as coarse aggregate was studied. This research was progressed with the range from the indoor mixing design evaluation into the actual goods production. The physical properties of the PHC pile are determined to satisfy through the appropriate mixing design adjustments. However, it should eliminate the aggregates including CaO and MgO in SG when it utilize in an AC (autoclave) type manufacturing process. It satisfied the bending moment, shear strength, and compressive strength of KS F 4306 except the surface states of the pile.