• Title, Summary, Keyword: frog

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Research on Frog Pattern in Li Brocade

  • Zhang, Shunai;Wu, Simin
    • The International Journal of Costume Culture
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    • v.13 no.2
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    • pp.82-87
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    • 2010
  • Frog or toad is an animal adoration of ancient ancestors in ethnic minorities in South China, in Li tribe tradition, frog is not only a symbol of avoiding evil and the expression of maternal love, but also the decoration of missing the ancestors. This article has discussed the origin of frog pattern, summarized the frog pattern's forms in Li brocade. At last also discussed the common frog pattern in Li tribe.

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Investigation of Generative Contactile Force of Frog Muscle under Electrical Stimulation

  • Park, Suk-Ho;Jee, Chang-Yeol;Kwon, Ji-Woon;Park, Sung-Jin;Kim, Byung-Kyu;Park, Jong-Oh
    • Journal of Mechanical Science and Technology
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    • v.20 no.11
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    • pp.1914-1919
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    • 2006
  • Recently, the microrobots powered by biological muscle actuators were proposed. Among the biological muscle actuators, frog muscle is well known as a good muscle actuator and has a large displacement, actuation forces and piezoelectric properties. Therefore, for the application of the biomimetic microrobot, this paper reports the electromechanical properties of frog muscle. First of all, the experimental setup has been established for measuring generative force of the frog muscle. Through the various electrical stimulating inputs to the frog muscle, we measured the contractile force of the frog muscle. From the measuring results, we found that the actuating contractile force responses of the frog muscle are determined by the amplitude, frequency, duty ratio, and wave form of the stimulation signal. This study will be beneficial for the development of the microrobot actuated by frog muscle.

Melanin-dispersing Effect of Vasopressin on Frog Skin Melanocyte (Vasopressin의 멜라닌 확산작용에 대하여)

  • Hong, Seung-Kil
    • The Korean journal of physiology & pharmacology
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    • v.7 no.2
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    • pp.59-66
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    • 1973
  • It has been reported that vasopressin disperse the melanophore granule of frog skin. The author used hypophysectomized and adrenergic receptor blockaded animals in order to define the mechanism of vasopressin on the melanopore pigment of frog skin. The Rana niglomaculata which could be found in the Seoul area were used on this experiment. The amount of the following drugs were injected into the lymphatic sac of the frog; vaospressin $(0.05\;{\mu}g/g\;B.W.)$, dibenzylin $(0.05\;{\mu}g/g\;B.W.)$, and propranolol $(0.01\;{\mu}g/g\;B.W.)$. The following results were observed; 1. Vasopressin dispersed the melanin granules of melanocyte of frog skin. 2. The melanin granule dispersion activity of vasopressin was observed on the hypophysectomized frog. 3. The melanin granule dispersion was observed on the adrenergic receptor blockaded frog with dibenzylin or propranolol respectively, especially the later one was found to be more obvious. 4. The melanin granule dispersion was observed on the frog which was injected with vasopressin after alpha-receptor or beta-receptor blockade and the later one was found to be more obvious. 5. The melanin granule dispersion was more effective with the blockade of beta-receptor after the treatment with vasopressin on hypophysectomized frog.

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A Note on the Modified Scheme for Nonlinear Shallow-Water Equations (비선형 천수방정식의 보정차분기법)

  • 조용식
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.11 no.4
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    • pp.197-200
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    • 1999
  • An extension of the modified leap-frog scheme is made to solve the nonlinear shallow-water equations. In the extended model. the physical dispersion of the Boussinesq equations is replaced by the numerical dispersion resulted from the leap-frog finite difference scheme. The model is used to simulate propagations of a solitary wave over a constant water depth and a linearly varying water depth. Obtained numerical results are compared with available analytical and other numerical solutions. A reasonable agreement is observed.

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Tool path planning of hole-making operations in ejector plate of injection mould using modified shuffled frog leaping algorithm

  • Dalavi, Amol M.;Pawar, Padmakar J.;Singh, Tejinder Paul
    • Journal of Computational Design and Engineering
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    • v.3 no.3
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    • pp.266-273
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    • 2016
  • Optimization of hole-making operations in manufacturing industry plays a vital role. Tool travel and tool switch planning are the two major issues in hole-making operations. Many industrial applications such as moulds, dies, engine block, automotive parts etc. requires machining of large number of holes. Large number of machining operations like drilling, enlargement or tapping/reaming are required to achieve the final size of individual hole, which gives rise to number of possible sequences to complete hole-making operations on the part depending upon the location of hole and tool sequence to be followed. It is necessary to find the optimal sequence of operations which minimizes the total processing cost of hole-making operations. In this work, therefore an attempt is made to reduce the total processing cost of hole-making operations by applying relatively new optimization algorithms known as shuffled frog leaping algorithm and proposed modified shuffled frog leaping algorithm for the determination of optimal sequence of hole-making operations. An industrial application example of ejector plate of injection mould is considered in this work to demonstrate the proposed approach. The obtained results by the shuffled frog leaping algorithm and proposed modified shuffled frog leaping algorithm are compared with each other. It is seen from the obtained results that the results of proposed modified shuffled frog leaping algorithm are superior to those obtained using shuffled frog leaping algorithm.

The frog appliance for upper molar distalization: a case report (Frog appliance를 이용한 상악 대구치의 원심 이동: 증례 보고)

  • Bayram, Mehmet;Nor, Metin;Kilkis, Dogan
    • The korean journal of orthodontics
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    • v.40 no.1
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    • pp.50-60
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    • 2010
  • The purpose of this article was to evaluate the effects of a new upper molar distalization system, the Frog Appliance, on dentofacial structures in a Class II, division 1 patient. An 11-year-old girl was referred to our clinic for orthodontic treatment. She had a mild skeletal Class II malocclusion with Class II molar and canine relationship on both sides. The treatment plan included distalization of the upper first molars bilaterally followed by full fixed appliance therapy. For the upper molar distalization, a new system, the Frog Appliance, was constructed and applied. Lateral cephalometric radiographs were used to evaluate the treatment results. Distalization of the upper first molars was achieved in four months successfully, and Class I molar relationship was obtained. Total treatment time was 16 months. According to the results of the cephalometric evaluation, a nearly bodily distal molar movement with a slight anchorage loss was attained. In conclusion, the Frog Appliance was found to be a simple, ef ective, non-invasive, and compliance-free intraoral distalization appliance for achieving bilateral molar distalization.

Site Selection of Narrow-mouth Frog(Kaloula borealis) Habitat Restoration Using Habitat Suitability Index (서식처 적합성 지수(HSI)를 활용한 맹꽁이 서식처 복원 위치 선정)

  • Shim, Yun-Jin;Cho, Dong-Gil;Hong, Jin-Pyo;Kim, Duck-Ho;Park, Yong-Su;Sung, Hyun-Chan
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.18 no.2
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    • pp.33-44
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    • 2015
  • This study was performed to propose the site selection plan for the restoration of the target Narrow-mouth Frog(Kaloula borealis) habitat, and has developed the AHP model to select the optimal site for narrow-mouth frog habitat restoration on the basis of the narrow-mouth frog Habitat Suitability Index (HSI) items (factors and variables). The assessment areas were established by the narrow-mouth frog HSI factors such as space, feed, cover, water(breeding), threatening factors and others, and the sub-assessment items by each assessment area were established based on the narrow-mouth frog HSI variables. The weighting values of the assessment areas and items were calculated by the developed AHP method. The weighting values of the 5 assessment areas were arranged in order as cover(0.283), water(breeding)(0.276), feed(0.230), space(0.147), and threatening factor(0.064). The final weighting values of the 14 assessment items were arranged in order of height as low-rise grassland(0.190), soil quality(0.178), and stones and between the stones(0.105). The scoring criteria according to the assessment items and factors were marked and applied by equal intervals considering the criteria by HSI items of the narrow-mouth frog and finally the scoring criteria diagram has been proposed for the optimal site selection of the narrow-mouth frog habitat restoration.

Reproductive Cvcle-related Changes in GnRH Immunoreactivitv in the Brains of Three Congeneric Species of Frog. (3종의 개구리 뇌에서 생식주기에 따른 GnRH 면역반응성의 변화)

  • 임욱빈;김정우
    • The Korean Journal of Zoology
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    • v.37 no.3
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    • pp.311-317
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    • 1994
  • Seasonal variations of GnRH were investigated by immunohlstochemicsl technique in three species of frog, Rona niEromaculutu, R. dvbowskii 8nd R. mgosa with different ovulation period in order to examine the relationship between GnRH expression and reproductive function. In all three species of frog, the intensity of GnRH immunoreactivitv and the number of GnRH neurons in the brawn were relatively high in frogs at the pre-ovulation period and markedly increased at the ovulation period. Those were then decreased after ovulation and further lowered during early hibernation period. These results indicate that GnRH experssion is closely related to specific phases of annual reproductive cycle in frog.

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Immunohistochemical Localization of Endocrine Cells in the Alimentary Tracts of Six Frog Species

  • Byung-Tae Choi;Dae-Yeon Moon;Jun-Hyuk Lee
    • Animal cells and systems
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    • v.3 no.2
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    • pp.193-197
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    • 1999
  • A peroxidase-antiperoxidase method was used to detect the cells showing immunoreactivities to six hormone antibodies in the alimentary tracts of six frog species, Rana nigromaculata, R. rugosa, R. amurensis coreana, R. catesbeiana, Bombina orientalis, and Hyla arborea japonica, inhabiting Korea. The cells immunoreactive to gastrin and cholecystokinin-8 were observed in the pylorus of the stomachs and in the small intestines of all frog species examined. In contrast, these somatostatin-immunoreactive cells were identified in the esophagus and the whole gastrointestinal tracts, but were absent from the large intestines in R. rugosa, R. catesbeiana, B. orientalis and H. arborea japonica. The pancreatic polypeptide (PP)-immunoreactive cells represented their distribution limited to the small intestines of R. amurensis coreana and H. arborea japonica, and they were additionally identified in the pylorus of the stomachs in the other four species. Serotonin- and glucagon- Immunoreactive cells revealed different regional distributions in which the former were observed throughout the whole alimentary tracts in all frog species investigated, whereas the latter were not found in these regions at all. Endocrine cells were relatively abundant in the pyloric portion of the stomach compared to other organs. The present study showed that all endocrine cells except for PP had a similar distribution in the alimentary tracts of all frog species used.

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Development of FROG Hardware and Software System for the Measurement of Femto-Seconds Ultrashort Laser Pulses (지속시간 펨토초 수준의 빛펄스틀 재는 이차조화파발생 프로그(SHG FROG) 장치 개발)

  • 양병관;김진승
    • Korean Journal of Optics and Photonics
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    • v.15 no.3
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    • pp.278-284
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    • 2004
  • A Second Harmonic Generation Frequency Resolved Optical Gating(SHG FROG) system was developed. Its performance test shows that it is capable of accurately measuring the temporal evolution of the electric field, both amplitude and phase, of femtosecond light pulses. For the retrieval of the temporal evolution of light pulses from their spectrograms obtained by using the FROG system, Principal Components Generalized Projection(PCGP) algorithm is used and in addition we used additional constraints of second-harmonic spectrum, marginals in frequency and time-delay of the spectrogram. Such modification of the software brings about significant improvement in speed and stability of the pulse retrieval process.