• Title/Summary/Keyword: South Africa

Search Result 282, Processing Time 0.034 seconds

Estimation of Bearing Capacity of Subbase and Subgrade Using Pavement Dynamic Cone Penetrometer (포장동적관입시험기(PDCP)에 의한 보조기층 및 노상 지지력 측정)

  • Roo, Myung-Chan
    • International Journal of Highway Engineering
    • /
    • v.5 no.1 s.15
    • /
    • pp.35-45
    • /
    • 2003
  • This paper presents a theoretical approach for estimation of CBR-value of subbase course and subgrade using a portable pavement dynamic cone penetrometer(PDCP). The PDCP used in this paper was based on a design from South Africa and extensive studies by Kleyn(1982) and more recently by Liveneh and Ishai(1987) and Chua(1988). To date, California Bearing Ratio[CBR] value was studied mainly for application of pavement structural design. This study was initiated to develop a method of obtaining the in situ CBR-values of subbase and subgrade for the structural evaluation of pavements in the swift and inexpensive manner. PDCP tests were implemented at 20 different kinds of soil samples in the lab and test results were analysed by a theoretical approach introduced. The procedure presented provides acceptable and promising results.

  • PDF

Review of Rice: Production, Trade, Consumption, and Future Demand in Korea and Worldwide

  • Jeong, Jong-Min;Kim, Eun Chong;Venkatanagappa, Shoba;Lee, Jeom-Sig
    • KOREAN JOURNAL OF CROP SCIENCE
    • /
    • v.62 no.3
    • /
    • pp.157-165
    • /
    • 2017
  • Being a staple food for more than half of the population of the world and South Korea, rice is an important crop. For the past 20 years, global paddy rice cultivation area and production have shown an annual growth of 0.46% and 1.61%, respectively. Global rice consumption for food and processing has increased by 1.37% and 3.68%, respectively. Due to the main reason for such increasing human population, it is expected that from 439 million tons in 2010, additional 116 million tons will be needed in 2035. Global rice imports and exports have doubled in the last 20 years. However, in spite of such increment, global rice exports in 2013 were 8.4% of the total production. It is thought that rice protection policies in the producing countries are the main reason for such small scale of rice trading. In the past 5 years, India recorded the largest growth rate in rice exports (51.4%), whereas China showed the largest growth rate in imports (61.0%). For global utilization of milled rice during the same period, approximately 79.4% was used as food, 7.2% as animal feeds, and 1.4% for processing. Regionally, Asia has shown a similar pattern to the global rice usage, whereas utilization for processing in America, for food in Africa, and for animal feed in Europe was relatively higher than the global rice usage. Korea's cultivation area and production since the last 5 years, are 0.5% and 0.8% of those of the world, respectively. Its annual rice export is approximately 3,000 tons, which is 0.01% of the global rice export. Korea's rice utilization is high for food and low for feed and for processing relative to global rice utilization. Therefore, a review must be conducted to increase Korea's utilization of rice for processing and for feed production.

A Research on the Information Portal for the Disabled (장애인 정보포털에 관한 연구)

  • Yoon, Cheong-Ok
    • Journal of the Korean Society for Library and Information Science
    • /
    • v.45 no.3
    • /
    • pp.27-47
    • /
    • 2011
  • The purpose of this study is to propose the direction of developing a new information portal for the disabled by examining the general characteristics, services, resources, and external links of five domestic and foreign information portals for the disabled, and 104 websites of organizations and institutions for the disabled in Korea. Information portals for the disabled examined in this study include the 'Bokjiro' portal and Dibrary Disability portal in Korea, the NARIC portal in the U.S.A., the National Accessibility Portal of the Republic of South Africa, and the National Interactive Portal of India. The following were proposed: (1) Consider both the disabled and the general public as potential users, (2) Identify the specific subject categories appropriate for their needs, (3) Secure information from high quality information sources, (4) Provide the communication and participation channel for the disabled, and (5) Observe Web Accessibility Standards.

Condition of Storage and Growth Characteristics on Bulb Propagation of Nerine by Tissue Culture (네리네 대량증식을 위한 자구 저장 및 순화재배)

  • Han Soo-Gon;Kang Chan-Ho;Lim Hoi-Chun;Ko Bok-Rai;Choi Joung-Sik;Lee Wang-Hyu;Choi In-Young
    • Korean Journal of Plant Resources
    • /
    • v.19 no.1
    • /
    • pp.50-53
    • /
    • 2006
  • Nerine was originated from South Africa and around 30 kinds of species are distributed in worldwide. In present study we have characterized the condition of storage and growing conditions on the bulb propagation of Nerine by the tissue culture. Result indicated that the percentage of decrement, decay and sprouting of bulblets in the tissue culture was high at the higher temperature compare to lower temperature. The optimum conditions for storage and time were 12 weeks at $15^{\circ}C$ which were having 86.4% sprouting rate. The sprouting rate at different temperature and acclimation time, using bulblets in the tissue culture, were optimum at early June when temperature is relatively higher($22^{\circ}C$) that facilitate to breaking the dormancy. Growth characteristics and capacity of photosynthesis of Nerine were better at red and blue mixed lightness.

A Study on Ethnic look Expressed in Modern Fashion (현대 패션에 나타난 민속풍(Ethnic look)에 관한 연구)

  • 정연자
    • Journal of the Korean Home Economics Association
    • /
    • v.31 no.4
    • /
    • pp.215-229
    • /
    • 1993
  • As a result of making an inquiry into the ethnic look of each region appearing in present-day fashion by Asia. America and Oceania. Africa and Europe as mentioned above, its characteristics could be summarized as follows: Firstly the Asian ethnic look consists of Indian, Chinese and Japanese looks as mainstream. In terms of form, the draped form constituted its mainstream, and both the draped form and the tunic form are appearing Simultaneously in the Chinese look. And in respect to color the Indian look is using luxurious primary colors red, blue, yellow and green and other regions are making overall use of natural colors. With respect to ornament various kinds of ornaments is utilized in Indian's Sari and turban. Chines's Coolie hat, straw hat and embroidery, knotted button, and bead ornament, and Japan's Obi and Obijime, etc. Secondly in America and Oceania, costurme representing the Indian look in North America and the picture of Western pioneer, and the Peruvian, Mexican and chilean ethnic looks in South America were expressing much. Here, the form consistied a draped form as its main strem, such colors as yellow, purple, grey, etc were much utilized, and the material of costume comprised knits, cotton and the like. And the ornament consisted of hats, tassel ornaments, bead ornaments, metal chain belt, long braided hair, etc. Thirdly, the African ethnic look had an exposing form and a draped form, and such colors as black, white, yellow, brown, etc were used as the fashion color. Ornaments such as precious stone, bead ornaments, animal bones, straw metal ornament, etc were used as fashion decorations. Fourthly, Russia's Cossack look, Bulgaria's Bavshika look, spain's ethnic look cane to the fore as the European look Both the draped form and the tunic form were used simultaneously as fashion form. And grey, brown, purple, etc were much used as fashion color in the European look. Such ornaments as Cossack. Bavshka, boots, tassel ornaments were much used and paisley pattern also was used.

  • PDF

An Outbreak of Gregarious Nymphs of Locusta migratoria (Orthoptera: Acrididae) in Korea and Their Genetic Lineage Based on mtDNA COI Sequences (한국에서 군집형 풀무치의 대발생과 그 집단의 유전적 계통)

  • Lee, Gwan Seok;Kim, Kwang Ho;Kim, Chang Seok;Lee, Wonhoon
    • Korean journal of applied entomology
    • /
    • v.55 no.4
    • /
    • pp.523-528
    • /
    • 2016
  • The migratory locust Locusta migratoria, one of the world's most notorious insect pests, has polyphenic (gregarious or solitarious) characteristics. Although this species is known to have several morphological variants, it is genetically divided into two different lineages using mitochondrial genome analysis: Southern (Africa, Southern Europe, Southern Asia, and Australia) and Northern (East Asia and the Eurasian continent). In 2014, a large number of orange black-colored gregarious L. migratoria nymphs suddenly appeared at Haenamgun, Jeollanamdo in the south of Korea. This is the first report of gregarious phase locusts occurring in Korea. In this study, mitochondrial COI sequences of one nymph and 11 adults of L. migratoria were analyzed to examine the genetic lineage of the gregarious nymphs of L. migratoria. Our results showed that all 12 individuals belong to the Northern linage and have low intraspecific genetic divergences (0.0% - 0.9%).

Genetic Diversity of Plasmodium vivax in Clinical Isolates from Southern Thailand using PvMSP1, PvMSP3 (PvMSP3α, PvMSP3β) Genes and Eight Microsatellite Markers

  • Thanapongpichat, Supinya;Khammanee, Thunchanok;Sawangjaroen, Nongyao;Buncherd, Hansuk;Tun, Aung Win
    • Parasites, Hosts and Diseases
    • /
    • v.57 no.5
    • /
    • pp.469-479
    • /
    • 2019
  • Plasmodium vivax is usually considered morbidity in endemic areas of Asia, Central and South America, and some part of Africa. In Thailand, previous studies indicated the genetic diversity of P. vivax in malaria-endemic regions such as the western part of Thailand bordering with Myanmar. The objective of the study is to investigate the genetic diversity of P. vivax circulating in Southern Thailand by using 3 antigenic markers and 8 microsatellite markers. Dried blood spots were collected from Chumphon, Phang Nga, Ranong and, Surat Thani provinces of Thailand. By PCR, 3 distinct sizes of $PvMSP3{\alpha}$, 2 sizes of $PvMSP3{\beta}$ and 2 sizes of PvMSP1 F2 were detected based on the length of PCR products, respectively. PCR/RFLP analyses of these antigen genes revealed high levels of genetic diversity. The genotyping of 8 microsatellite loci showed high genetic diversity as indicated by high alleles per locus and high expected heterozygosity ($H_E$). The genotyping markers also showed multiple-clones of infection. Mixed genotypes were detected in 4.8% of $PvMSP3{\alpha}$, 29.1% in $PvMSP3{\beta}$ and 55.3% of microsatellite markers. These results showed that there was high genetic diversity of P. vivax isolated from Southern Thailand, indicating that the genetic diversity of P. vivax in this region was comparable to those observed other areas of Thailand.

Numerical Model study of Surface Temperature and Hydrological Budget Change for the Last Glacial Maximum (마지막 최대 빙하기의 온도 및 물수지 변화 수치모델연구)

  • Kim, Seong-Joong;Lee, Bang-Yong;Yoon, Ho-Il
    • Journal of the Korean Geophysical Society
    • /
    • v.9 no.2
    • /
    • pp.135-145
    • /
    • 2006
  • The surface temperature and hydrological budget for the last glacial maximum (LGM) is simulatedwith an atmospheric general circulation model of NCAR CCM3 at spectral truncation of T170, corespondingto a grid cel size of roughly 75 km. LGM simulations were forced with the reconstructed CLIMAP sea surface temperatures, sea ice distribution, ice sheet topography, reduced CO2, and orbital parameters.oC in winter, 5.6oC in sumer,and 6oC annual-mean. The decrease of surface temperature leads to a weakening of the hydrologicalcycle. Global-mean precipitation decreases by about 14% in winter, 17% in summer, and 13% annually.However, some regions such as the U.S., southern Europe, northern and eastern Africa, and the SouthAmerica appear to be weter in the LGM winter and Canada and the Midle East are weter in sumer. model captures detailed climate features over land.

  • PDF

Analysis of Strength and Weaknesses in Lifelong Learning System of BRICS (BRICS 국가별 평생교육체제 강점 및 약점 분석연구)

  • Kim, Ju-Seuk
    • The Journal of the Korea Contents Association
    • /
    • v.21 no.11
    • /
    • pp.414-425
    • /
    • 2021
  • The aim of this study is to measure and evaluate competitiveness of lifelong learning systems of BRICS countries in the respect of National Lifelong Learning System (NLLS). To analyze the data, this study used the mechanism model and 32 indicators and 12 sub-factors developed to measure the NLLS of developing countries. As a result of the Global Lifelong Learning Index (GLLI) measurement, China and Russia were relatively strong, while Brazil and South Africa formed the middle group. India scored relatively low. However, there are areas of lifelong education that each country should focus on, and this study compared and analyzed the strengths and weaknesses of the lifelong learning systems of each BRICS country. It is expected that the findings of this study will be used as standards to evaluate lifelong learning-related policies and make decisions to raise NLLS competitiveness, and as basic materials to know current NLLS situations of BRICS countries.

Antioxidant Activity of Brown Seaweed, Ecklonia maxima, Collected from South Africa (남아프리카공화국 갈조류 Ecklonia maxima 줄기의 항산화 활성 평가)

  • Choi, Ye-Ji;Kim, Hyun-Soo;Je, Jun-Geon;Wang, Lei;Jeon, You-Jin
    • Journal of Marine Bioscience and Biotechnology
    • /
    • v.11 no.1
    • /
    • pp.29-35
    • /
    • 2019
  • In the present study, the alcoholic and enzymatic extracts of Ecklonia maxima were prepared and their antioxidant activities were evaluated via the free radical scavenging activities. The lyophilized seaweed powder was extracted by 70% ethanol and the resultant extract was obtained, named as the alcoholic extract of E. maxima stem (EMSE) obtained. The residue after EMSE preparation was continuously by Celluclast-assistant extraction and then the obtained enzymatic extract was identified as polysaccharides-rich extract of E. maxima stem (EMSP). The results indicated that the extraction yields of EMSE and EMSP were 2.18% and 5.43%, respectively. In addition, the free radical scavenging activities of EMSE and EMSP were determined using an electron spin resonance (ESR) spectrometer. EMSE containing 5.36% of polyphenol and 1.56% of polysaccharide scavenged DPPH and alkyl radicals at the $IC_{50}$ values of 0.48 and 0.63 mg/mL, respectively. EMSP containing 0.33% of polyphenol and 41.58% of polysaccharide showed at the $IC_{50}$ values of 0.33 and 0.55 mg/mL, respectively. These results demonstrate that EMSP containing a high amount of polysaccharides possesses a strong free radical scavenging activity which might be a potential ingredient in pharmacological and cosmeceutical industries.