• Advances in concrete construction
• /
• 제10권5호
• /
• pp.417-429
• /
• 2020

Waste glass is a global solid waste with huge reserves. The discarded waste glass has caused a series of problems such as resource waste and environmental pollution, so it is urgent to recycle waste glass with high replacement level. Glass powder (GP), as a supplementary cementitious material (SCM), used in cement-based materials has already become one of the important ways to recycle waste glass mainly attributed to its pozzolanic reaction and filling effect, especially to the suppressed ASR expansion. This paper demonstrates an overview of the properties of GP and its effect on the fresh and mechanical properties of cement-based materials. The study found that the influence of GP on the performance of cement-based materials mainly depends on its content, particle size, color and type, curing conditions, and other SCMs. Finally, based on the problems involved in the investigation of concrete containing GP, some corresponding suggestions and efforts are given to further guide the utilization of GP in cement-based materials.

• 한국식품영양과학회지
• /
• 제15권1호
• /
• pp.90-97
• /
• 1986

Timing of weaning is later in Korean rural and lower urban classes compared with middle and upper classes. Weaning after the international standard of six months of age has adverse effects on the growth rate of children. This occurs because supplementary foods are not provided for the child during the weaning period; rather, the infant goes directly from nursing(or bottle feeding) to the cereals and solid foods of the adult diet. Consequently, all nutrient and calorie intake, with the exception of thiamin, in Korean rural children had not yet attained the Recommended Dietary Allowance (RDA). This situation bas created an urgent need for easy to prepare, low priced. highly nutritious supplementary foods. The research team of Yonsei University developed 3 formulas prepared from rice, soybeans, sesame, dry skim milk and fish which are all plentiful and inexpensive items in Korea. A proximate analysis and amino acid determination were performed on three formula. These formulas were prepared and used as exprimental diet for an animal assay. In the animal assay, growth rate, PER evaluated and biochemical analyses were also carried out. A safety storage assay and the cost evaluation were also conducted.

• Communications for Statistical Applications and Methods
• /
• 제28권4호
• /
• pp.369-391
• /
• 2021

The vlda is an R (R Development Core team et al., 2011) package which provides functions for visualization of multidimensional longitudinal data. In particular, the R package vlda was developed to assist in producing a plot that more effectively expresses changes over time for two different types (long format and wide format) and uses a consistent calling scheme for longitudinal data. The main features of this package allow us to identify the relationship between categories and objects using an indicator matrix with object information, as well as to cluster objects. The R package vlda can be used to understand trends in observations over time in addition to identifying relative relationships at a simple visualization level. It also offers a new interactive implementation to perform additional interpretation, therefore it is useful for longitudinal data visual analysis. Due to the synergistic relationship between the existing VLDA plot and interactive features, the user is empowered by a refined observe the visual aspects of the VLDA plot layout. Furthermore, it allows the projection of supplementary information (supplementary objects and variables) that often occurs in longitudinal data of graphs. In this study, practical examples are provided to highlight the implemented methods of real applications.

• International Journal of Internet, Broadcasting and Communication
• /
• 제14권1호
• /
• pp.152-161
• /
• 2022

Recently, it is recognized as a high-cost and inefficient logistics system that increases traffic congestion and environmental problems due to an increase in traffic volume due to the activation of the online market. In order to solve inefficient problems such as unavoidable traffic congestion and environmental problems caused by the increase in traffic volume, it is necessary to develop a freight transport system technology using the existing urban railway infrastructure and freight-only urban railway. The urban subway logistics system is a logistics system that requires a combination of various technologies to solve the nationwide demand for urban logistics and road traffic problems. This paper recognized the existing traffic congestion and environmental pollution of road traffic as problems, and supplemented the contact point requirements presented above by identifying the sub-systems constituting the target system and supplementary points for each part-level contact point. In this study, as a complex system operated for one purpose by grafting various technologies, a plan is required to secure the reliability and safety of operation from various viewpoints. The results of this study can contribute to the initial configuration and basic data to solve the interface bottleneck of the urban subway logistics system to be promoted in the future.

• 한국동물학회:학술대회논문집
• /
• 한국동물학회 1995년도 한국생물과학협회 학술발표대회
• /
• pp.82-82
• /
• 1995

Regulation of enzyme synthesis by transcriptional and translational control systems provides rather stable adaptation to change of amino acid level in the growth medium, while manipulation of enzyme activity through endproduct feedback inhibition represents rather short-term and reversible ways of adjusting metabolic fluctuation of amino acid level. Various control mechanisms interplay to regulate genes encoding enzymes for amino acid biosynthesis in the yeast, Sacchromyces cerevisiae. When amino acids are in short supply, genes under a cross-pathway regulatory mechanism Or general amino acid control (general control) increase their action, in which Gcn4p is the major positive regulator of gene expression. When cells are cultured in minimal medium, basal level expression is also regulated by supplementary control elements, where inorganic phosphate level is additionally involved. Most of amino acid biosynthetic genes are also regulated by the level of endproduct of the pathway. This pathway-specific regulatory mechanism is called specific amino acid control (specific controD, under which gene expression is reduced when endproduct is present in the medium. Derepression of a gene through general control can be usually overridden by repression through specific control, where the endproduct level of that particular pathway is high and not limiting. In this presentation, regulatory factors for basal level expression and general control of yeast amino acid biosynthesis will be discussed, m addition to pathway-specific repression patterns and interaction between CrOSS- and specific-control mechanisms. Preliminary results are also presented from the investigation of the cloned genes in the threonine biosynthetic pathway of the yeast. yeast.

• Journal of Nutrition and Health
• /
• 제37권2호
• /
• pp.81-87
• /
• 2004

This study was conducted to investigate the supplementary effects of Suwon 464 developed by Rural Development Administration, which has over two times of dietary fiber content compared with normal rice (Ilpum), on lipid metabolism in diabetic mice. We supplied 5 kinds of experimental diets (com starch diet as a control (CO), Ilpum polished rice diet (IP), Ilpum brown rice diet (IB), polished rice diet (SP) and brown rice diet (SB) of Suwon 464) to diabetic mice for 8 weeks, after analyzing dietary fiber contents of 5 experimental diets. Diet intake, body weight, organ weights, and lipids levels of serum, liver and feces were measured. The dietary fiber contents in CO, IP, IB, SP, and SB diets were 1.0, 1.2, l.4, 1.4, and 2.0% respectively. Body weight and liver and epididymal fat pad weights were lower in SB group than the other groups though there was no significant difference in diet intake among experimental groups. The concentrations of serum triglyceride was lower in SP and SB groups than CO and IP groups. The levels of hepatic total lipid and total cholesterol were significantly lower in SP and SB groups than CO group, and the level of hepatic triglyceride was lower in IB, SP and SB groups than CO group. The levels of total lipid and triglyceride excreted in feces were higher in IB, SP and SB, and the level of total cholesterol in feces was higher in SP and SB groups than CO group. These results suggested that the high dietary fiber rice (Suwon 464) decrease the triglyceride or total cholesterol concentrations of serum and liver by increasing of fecal lipid excretion in diabetic mice. (Korean J Nutrition 37(2): 81∼87, 2004)

• Asian-Australasian Journal of Animal Sciences
• /
• 제16권12호
• /
• pp.1804-1808
• /
• 2003

A layer experiment was conducted to determine the effects of supplementary methionine chelates (Cu, Zn and Mn), individual or in combination, on laying performance, eggshell quality, gizzard erosion, and IgG level of serum for 8 weeks. Five hundred 96-wk-old force molted ISA Brown layers were assigned to five dietary treatments. Basal diet was formulated to meet or exceed the nutrients requirements listed in NRC (1994). Five experimental diets were control, Zn-methionine chelate (Zn-Met) supplemented, Cumethionine chelate (Cu-Met) supplemented, Zn-Mn-methionine chelate (Zn-Mn-Met) supplemented and Zn-Mn-Cu-Met supplemented diet. Each treated diet was supplemented with respective mineral(s) at the level of 100 ppm in the form of methionine chelate. Egg production was increased by Cu-Met supplementation but decreased by Zn-Met supplementation. Egg weight was significantly (p<0.05) lower in Cu-Met treatment than those of the control and Zn-Met treatment. Specific gravity of eggs and eggshell strength were highest and soft egg production was lowest in Cu-Met treatment. Gizzard erosion index was significantly increased by supplementation of Cu-Met, Zn-Mn-Met or Zn-Mn-Cu-Met. Zinc content in liver significantly increased by Zn-Met, but not by Zn-Mn-Cu-Met treatment. In conclusion, 100 ppm Cu in Cu-Met chelate improved laying performance and eggshell quality but also increased gizzard erosion index. Supplementation of Zn-Met or its combination with other mineral chelates had no beneficial effects on laying performance and eggshell quality.

• 컴퓨터교육학회논문지
• /
• 제8권6호
• /
• pp.45-53
• /
• 2005

본 논문에서는 수업 시간에 바로 활용할 수 있는 보다 향상된 사회과 수준별 교육 방안을 제안한다. 현재까지 제시된 수준별 교육방법들이 실제 학교에서 적용되지 못한 이유는 크게 두 가지를 들 수 있다. 하나는 수준별 교육이 개별학습 위주로 이루어져서 학습자는 개별과제 위주의 자율학습을 하고, 교사는 개별과제 개발 및 관리에 시간을 보내게 됨으로써 수준별 교육이 비효율적으로 진행되는 것이다. 다른 하나는 수준별 교육을 위한 수준 판정시 총점에서 기준 점수를 근거로 심화반과 보충반으로 분류함으로써 학습자의 수준을 제대로 구별할 수 없다는 것이다. 이러한 문제를 해결하기 위하여, 본 논문에서는 수준별 수업시 비슷한 수준의 학습자들이 협동학습을 하여 학습효과를 놀이도록 하였고, 소단원별로 평가하여 영역별 수준 학습이 이루어지도록 하였다. 본 논문에서 제안된 수준별 교육 방법을 중학교 1학년 사회과 과목에 적용해 본 결과 학업성취도가 향상됨을 확인하였다.

• 대한수학교육학회지:학교수학
• /
• 제11권1호
• /
• pp.147-164
• /
• 2009

본 연구에서는 초등학교 4학년 수학학습 부진학생을 대상으로 도형영역에 대해 수학저널 쓰기를 활용한 보충학습을 실시하여 수학 부진학생의 기하학적 사고 수준에 어떤 변화가 있는지 알아보았다. 연구 대상의 사전 기하학적 사고 수준 검사 결과에 기초하여 지도 내용을 van Hiele의 5단계 학습과정에 따라 재구성하여 주 1회 이상 12주간의 보충수업 후, 사후 기하학적 사고 수준 검사 결과 및 학생들이 작성한 수학저널과 수업 중 나타난 반응 및 면담 내용을 분석함으로써 부진학생들 외 기하학적 사고 수준 변화에 주목하였다. 더불어 의사표현력이나 협동활동과 같이 수학학습 부진학생의 교수-학습과 관련한 교수학적 함의를 얻을 수 있었다.

• 한국측량학회:학술대회논문집
• /
• 한국측량학회 2009년도 춘계학술발표회 논문집
• /
• pp.35-39
• /
• 2009

균일한 분포를 갖는 지형자료와 중력자료는 정밀 지오이드 모델의 정밀도에 결정적인 영향을 미친다. 본 연구에서는 시뮬레이션 실험을 통하여 현재 편중된 분포를 갖는 우리나라 지상중력자료를 이용하여 정밀도 5cm급의 정밀 지오이드 모델을 구축할 때 지상중력자료가 보충되어야 할 지역을 선정하였다. 시뮬레이션 결과 현재 우리나라 지상중력자료의 분포 및 정밀도는 8cm 정도의 지오이드 오차를 유발하는 것으로 나타났고, 이때 오차가 30cm 이상인 지점(주로 강원도 산악지역)에 2km 간격의 중력자료를 추가한 경우 5cm 정도의 지오이드 오차를 유발하는 것으로 나타났다. 따라서 5cm급의 정밀 지오이드 모델을 구축하기 위해서는 강원도 산악지역에 2km 이하의 간격으로 중력보완측량을 실시하여 자료를 보완하는 것이 필수적이라 판단된다.