• 대한화학회지
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• 제60권4호
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• pp.286-291
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• 2016

• Asian-Australasian Journal of Animal Sciences
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• 제13권10호
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• pp.1445-1449
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• 2000

A total of one hundred twenty pigs ($L{\times}Y{\times}D$, $50{\pm}0.78kg$) were employed for a 7-week feeding trial to determine the effect of inclusion levels of vitamin and mineral (VTM) premixes on growth performance, nutrient digestibility and pork stability in finishing pigs. Treatments were 100% (Control), 150%, 200%, and 250% of NRC (1998) requirements. Increasing dietary VTM premixes in finishing pigs had a linear (p<0.05) effect on ADG. It also had a linear effect (p<0.05) on the digestibility of calcium and a linear and quadratic effect (p<0.05) on the digestibility of phosphorus. As dietary VTM levels were increased from 100 to 250% NRC (1998), TBARS values of pork samples were linearly (p<0.05) lowered when stored at $1^{\circ}C$ for 2 or 3 weeks. There was also a trend reducing POV of pig meat as dietary VTM level was increased. In conclusion, it would appear that inclusion of VTM premixes at the level of 200-250% of NRC (1998) requirements gave positive effects on growth performance and pork stability in finishing pigs.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제30권6호
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• pp.554-560
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• 2008

In posterior maxilla, it is difficult to achieve primary stability of implants due to sinus pneumatization, alveolar bone loss, and low bone quality. The accurate and objective primary stability assessment is important for good prognosis of implants. Purpose: The aim of this study was to assess the primary stability of the non-submerged, internal type implants with maxillary sinus augmentation using deproteinized bovine bone mineral by a resonance frequency analyzer, when residual alveolar bone height is under 8mm Materials and methods: A total of 20 implants was placed into 5 grafted maxillary sinuses in 5 patients. Deproteinized bovine bone mineral (Bio-$Oss^{(R)}$) was used as graft material. SS II implants (diameter 4.1mm, and length 11.5mm, SLA suface)) were placed. All of the patients received maxillary sinus graft procedure by 1-step technique. Residual bone height was $1.3{\sim}7.8mm$ (mean 4.4mm) measured by panorama radiography. After implant placement, RFA was measured at 4,8,12,20 weeks. The results were divided into 2 groups; RFA value under 4mm and over 5mm of bone height. It was statistically analyzed. Results: 1. The primary stability of implants was increased with time 2. The RFA value was above 65 ISQ at 12 weeks 3. There was no correlation between RFA and residual alveolar bone height in maxillary sinus augmentation by 1-step technique. Conclusion: 1-step surgical procedure is a feasible option for patients with as little as 4mm residual alveolar bone height, when utilizing non-submerged, internal type implants with xenografts.

• 대한원격탐사학회지
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• 제18권1호
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• pp.1-12
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• 2002

Landslide prediction modeling has been regarded as one of the important environmental applications in GIS. While, landslide stability in a certain area as collateral process for prediction modeling can be characterized by DEM-based hydrological features such as flow-direction, flow-accumulation, flow-length, wetness index, and so forth. In this study, Slope-Area plot methodology followed by stability index mapping with these hydrological variables is firstly performed for stability analysis with actual landslide occurrences at Boeun area, Korea, and then Landslide prediction modeling based on likelihood ratio model for landslide potential mapping is carried out; in addition, KOMPSAT EOC imagery is used to detect the locations and scalped scale of Landslide occurrences. These two tasks are independently processed for preparation of unbiased criteria, and then results of those are qualitatively compared. As results of this case study, land stability analysis based on DEM-based hydrological variables directly reflects terrain characteristics; however, the results in the form of land stability map by landslide prediction model are not fully matched with those of hydrologic landslide analysis due to the heuristic scheme based on location of existed landslide occurrences within prediction approach, especially zones of not-investigated occurrences. Therefore, it is expected that the resets on the space-robustness of landslide prediction models in conjunction with DEM-based landslide stability analysis can be effectively utilized to search out unrevealed or hidden landslide occurrences.

• Advances in concrete construction
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• 제6권1호
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• pp.69-85
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• 2018

In order to provide sufficient stability and resistance against bleeding and segregation during transportation and placing, mineral admixtures are often used in self-compacting concrete mixes (SCC). These fine materials also contribute to reducing the construction cost and the consumption of natural resources. Many studies have confirmed the benefits of these mineral admixtures on properties of SCC in standard curing conditions. However, there are few published reports regarding their effects at elevated curing temperatures. The main objective of this study is to investigate the effect of three different mineral admixtures namely limestone powder (LP), granulated blast furnace slag (GS) and natural pozzolana (PZ) on mechanical properties and porosity of SCC when exposed to different curing temperatures (20, 40, 60 and $80^{\circ}C$). The level of substitution of cement by mineral admixture was fixed at 15%. The results showed that increasing curing temperature causes an improvement in performance at an early age without penalizing its long-term properties. However the temperature of $40^{\circ}C$ is considered the optimal curing temperature to make economical and high performance SCC. On the other hand, GS is the most suitable mineral admixture for SCC under elevated curing temperature.

• 자원환경지질
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• 제38권1호
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• pp.91-99
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• 2005

건설 현장 절취사면에서 발생되는 산성암반배수(Acid Rock Drainage, ARD)는 암석에 함유된 황화광물의 산화에 의해 발생하며, 주변 환경, 구조물의 안정성과 수명, 경관에 악영향을 주고 있다. 우리나라의 지형은 70% 이상이 산 지이므로 토목공사과정에서 사면절취와 터널공사가 빈번히 이루어지고 있는데, 산성배수를 발생시킬 개연성이 있는 황 철석을 함유한 암석들은 전국에 분포한다. 본 연구에서는 다양한 암반을 대상으로 암석유형별 산성배수 발생특성을 파악하고 잠재적인 산발생능력을 규격화된 방법으로 평가하고자 하였다. 산발생능력 평가 결과 NP/MPA 비에 따라서 14개의 시료가 산성배수 발생 가능성이 높은군에, 4개의 시료는 산성배수 발생 가능성이 낮은군에 해당하였으며, 암 석의 종류와 산발생능력 평가 결과는 상관관계는 명확하지 않았다. 본 연구에서 대상으로 한 시료만으로 볼 때, 편마 암, 화강암의 경우 산성배수 발생 가능성이 낮은 군으로, 열수변질을 받은 화산암, 응회암, 탄질셰일, 금속광산 폐석시 료는 산성배수 발생 가능성이 높은 군으로 분류되었다. 물시료 분석 결과 일부 항목이 지하수의 생활용수 이용시 수 질기준을 초과하였다. 이는 주로 황철석의 산화로 인하여 발생한 산에 의해 배수가 낮은 pH를 유지하면서 중금속들 을 용출시켜 지속적으로 배출하기 때문이며, 고농도의 중금속을 함유한 산성배수가 계속 생산, 유입될 경우 연구대상 지역 부근 지하수와 하천수의 수질오염이 우려 된다.

• 한국응용과학기술학회지
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• 제30권1호
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• pp.152-159
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• 2013

폴리글리세롤에스터 유화제를 이용한 에멀젼의 입자상태 및 시간의 변화에 따른 안정성을 여러 가지 오일을 이용하여 실험을 실시하였다. 실험결과 오일의 종류에 따라 입자크기 및 안정성에 있어서 다소의 차이가 있는 것을 확인하였다. 폴리글리세롤 에스터로 유화된 가장 안정한 오일은 polar 오일인 실리콘계열과 지방산에스터 오일이고, 탄화수소계열의 nonpolar오일(Mineral oil, squalane, polydecene) 등이 유화에 있어서 가장 불안한 상태를 보였다. 식물성오일도 폴리글리세릴 에스터 유화제와는 안정한 형태의 입자형성을 보였다.

• 한국축산식품학회지
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• 제35권5호
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• pp.660-668
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• 2015

This study was performed to investigate the chemical composition, mineral status, oxidative stability, and texture attributes of dry-cured ham from pigs fed processed sulfur (S, 1 g/kg feed), and from those fed a basal diet (CON), during the period from weaning to slaughter (174 d). Total collagen content and soluble collagen of the S group was significantly higher than that of the control group (p<0.05). The pH of the S group was significantly higher than that of the control group, whereas the S group had a lower expressible drip compared to the control group. The S group also showed the lower lightness compared to the control group (p<0.05). In regard to the mineral status, the S group had significantly lower Fe²⁺ and Ca²⁺ content than the control group (p<0.05), whereas the proteolysis index of the S group was significantly increased compared to the control group (p<0.05). The feeding of processed sulfur to pigs led to increased oxidative stability, related to lipids and pigments, in the dry-cured ham (p<0.05). Compared to the dry-cured ham from the control group, that from the S group exhibited lower springiness and gumminess; these results suggest that feeding processed sulfur to pigs can improve the quality of the texture and enhance the oxidative stability of dry-cured ham.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2001년도 봄 학술발표회 논문집
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• pp.17-24
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• 2001

Several underground cavities were found during construction of a road tunnel in 600m length . The area belong to Whasoon coalfield where extensive ground subsidences have occurred. It is necessary to find other underground cavities which might be located just near the road tunnel for safety, The field surveys and laboratory tests were conducted such as surface geological survey(672m), surface reflection seismic exploration(399m), drilling test(3 NX holes), 9 laboratory tests for rocks, 3 boreholes televiewer tests, reflection seismic exploration in tunnel(2, 342m). To estimate the effects of underground cavities on the road tunnel, 3 geological section were analysed with FLAC-2D modeling. The effects of the ground reinforcement were also analysed.

• 대한치과의사협회지
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• 제51권12호
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• pp.650-657
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• 2013

The aim of this study was to achieve healing of Peri-implantitis defects and hard tissue augmentation using a bovine-derived bone mineral on the defect site. Two patients were treated with the surgical approach. With a full muco-periosteal flap elevation, the implant surfaces were exposed and granulation tissue removed around the implant and between the threads. Each surface of the contaminated implant was prepared with the air-abrasive device(PerioFlow$^{(R)}$) for decontamination. Bovine-derived bone mineral(Bio-Oss collagen$^{(R)}$) was then used to fill the defects and muco-periosteal flaps sutured to achieve transmucosal healing. Radiographs and clinical photographs were taken before and after 6 months of healing and an estimate of bone fill was assessed. Within the limits of the present case report, a surgical approach in treatment of peri-implantitis defects using a collagen form of bovine bone mineral was visited. Although limited, the two cases showed the stability and biocompatibility of a bovine-derived bone mineral and effectiveness of air-abrasive device(PerioFlow$^{(R)}$) as a decontamination method.