• Title/Summary/Keyword: Relative Length

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The Growth Analysis of the Crawfish (Cambaroides similis Koelbel) (Crustacea) 2. Relative Growth (가재(Cumbaroides similis Koelbel)의 상대성장 분석)

  • 연근성;노용태정병균
    • The Korean Journal of Zoology
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    • v.35 no.2
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    • pp.231-239
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    • 1992
  • For the analysis of the relative grouch of six body pans, such as carapace width. abdominal length, abdominal width, cheliped length, second pereiopod length and third pereiopod length, to the carapace length of crayfish (Comboroides similis Koelbel), the equation Y = bXa were applied. The results were as follows: 1. In the relative srourth of each body part to the carapace length, abdominal width and abdomial length in both sexes showed as positive allometrv, the third pereiopod length in both sexes as isometry and the rest shouted as negative. The least coefficient of the relative growth was found in cheliped length in female (0.9300).2. The grolwth gradient of each body part to the carapace length in each sex revealed decreasing pattern in abdominal length and third pereiopod length in both sexes and the abdominal width in male with the growth centers on the initial growth period. and the rest showed increasing pattern with the growth centers on the 6th growvth period except the abdomini,d uridth in female on the 3rd growth period.

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Relative Growth of Microstomus achne (Pleuronectidae, PISCES) during Early Life Stage (찰가자미(Microstomus achne) 초기생활기의 상대 성장)

  • Byun, Soon-Gyu;Kang, Chung-Bae;Han, Kyeong-Ho;Kim, Jin-Koo
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.46 no.6
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    • pp.970-972
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    • 2013
  • We examined the relative growth of Microstomus achne during early life stages of laboratory-reared larvae and juveniles. Turning points in the relative growth of preanal length and upper jaw length against total length occurred during the settlement period (11.12-19.91 mm in total length). However, turning points in the relative growth of head length and eye diameter, as compared to total length, occurred during metamorphosis (17.57-22.47 mm in total length). Our results suggest that Microstomus achne concentrates its energy on the feeding apparatus (jaw) and digestive organs (intestine) rather than sensory or neural organs (eye, head) during early larval stage growth.

QUEUE LENGTH DISTRIBUTION IN A QUEUE WITH RELATIVE PRIORITIES

  • Kim, Jeong-Sim
    • Bulletin of the Korean Mathematical Society
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    • v.46 no.1
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    • pp.107-116
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    • 2009
  • We consider a single server multi-class queueing model with Poisson arrivals and relative priorities. For this queue, we derive a system of equations for the transform of the queue length distribution. Using this system of equations we find the moments of the queue length distribution as a solution of linear equations.

Estimation of Standard Length-Weight Relationships of 10 Freshwater Fish in the South Korea for Application of Relative Weight Index (한국 담수어류 10종의 상대 무게지수(Relative weight index) 활용을 위한 표준 길이-무게 상관관계(Standard Length-Weight relationships) 산출)

  • Baek, Seung-Ho;Park, Sang-Hyeon;Kim, Jeong-Hui
    • Korean Journal of Ichthyology
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    • v.32 no.2
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    • pp.55-62
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    • 2020
  • The Relative weight index is an index for evaluating nutritional condition of fish by calculating a ratio of observed weight to standard weight. The purpose of this study is estimating standard Length-Weight relationships (standard LWRs) to calculate standard weight for application of relative weight index and analyze frequency distribution of relative weight index of 10 freshwater fish in the South Korea. The standard LWRs for each species was calculated by the Length-Weight data sets from 798 times of captures at 141 sites. The correlation of determination (r2) for all species was over 0.9 and values of parameter b were within the expected range according to Froese (2006). We calculated in increments of 10 from 10 to 90 percentile of relative weight index for each species, and it could be used as a standard for quantitative assessment of nutritional condition of freshwater fish.

Relative Growth and Squamation in Larvae and Juvenile of Cultured Larimichthys polyactis (Sciaenidae) (양식산 참조기(Larimichthys polyactis) (민어과) 자치어의 상대성장과 비늘 형성)

  • Soo-Been Kim;Jeong-Hyeon Cho;Jin-Koo Kim
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.56 no.3
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    • pp.324-330
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    • 2023
  • We investigated the relative growth and squamation of larvae and juveniles of cultured Larimichthys polyactis. Analysis of the relative growth of larvae and juveniles showed that their preanal length, head length, eye diameter, body depth, and snout length increased with growth. There was no significant chage in the relative growth. The ratio of preanus length to standard length (SL) increased rapidly until SL was approximately 12 mm, and then increased gradually. Cycloid scales first appeared on the lateral line, progressed to the abdominal cavity at 15.13 mm SL, and expanded to the occipital region, base of pectoral fin, and ventral region of the eye at 17.82 mm SL. At 18.03 mm SL, scales formed on the cheek, and those at the base of pectoral fin and in the abdominal cavity were connected to each other. At 19.06 mm SL, major part of the head was covered by scales, except near the lower jaw. Cycloid scales on the lateral line changed to ctenoid scales at the range of 31.71-32.24 mm SL, and those on the nape changed at the range of 69.02-70.84 mm SL. Our results may help to establish conservation and management strategy for Larimichthys polyactis aquaculture.

Techniques of Optimizing the Launching Nose under Conditions of Minimizing the Launching Bending Moment (압출가설시 발생하는 휨모멘트의 최소화 조건을 통한 압출노즈의 최적설계)

  • Choi, Hang Yong;Suh, Suk Koo;Oh, Myung Seok;Oh, Sae Hwan
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.28 no.4A
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    • pp.487-495
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    • 2008
  • The behavior of nose-deck system during launch was examined by three dimensionless launching parameters, such as the relative flexural stiffness, the relative nose weight, and the relative nose length. The techniques of optimizing the launching nose were illustrated and equations of relationship between relative nose weight and relative nose length were derived under minimum conditions of the launching negative and positive moment. Equations of maximum positive and negative moment were suggested under the conditions. The optimum design method of the launching nose was proposed in launched continuous girder bridges. It was found that the ideal launching nose was to design that with the relative nose weight of 0.167 and the relative nose length of 0.836 to minimize absolute values of the positive and negative moment during launch.

Splice Length of High Relative Rib Area Reinforcing Bars (높은 마디 고강도 철근의 이음성능)

  • Oh Ha Na;Hong Geon Ho;Song Ki Mo;Choi Dong Uk
    • Proceedings of the Korea Concrete Institute Conference
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    • 2004.05a
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    • pp.116-119
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    • 2004
  • The use of higher strength materials frequently requires the change of design provisions. Following to the previous researches, high strength reinforcing bars have a weak point about the development and splice length. Based on the previous research about high relative rib area, bond strength between reinforcing bars and concrete can be improved by the control of rib height and spacing. But, the code provisions do not include these specific shape of reinforcing bars. So, the purpose of this paper is to determine the effect of relative rib area to the bond strength. This paper describes the experiment and analysis of 5 beam-spliced specimens containing D25 with relative rib areas ranging from 0.073 to 0.17. The test results are also analyzed to make a design formula about the calculation of splice length on the consideration of relative rib area.

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Effects of Rhizome Length and Node Numbers on the Proliferation of Menyanthes trifoliata Cuttings (조름나물 삽목 시 지하경의 길이와 마디 수에 따른 증식효율)

  • Lee, Gwang-Moon;Kim, Jae Geun
    • Journal of Wetlands Research
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    • v.14 no.2
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    • pp.193-198
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    • 2012
  • To enhance the proliferation efficiency of Menyanthes trifoliata L. endangered species in Korea, various rhizome cuttings were tested based on cutting length and node numbers. Growth length and increased volume of rhizomes were highest on long cuttings of 10-18cm length. But relative growth length of rhizomes were higher in short cuttings of 2-4cm and medium cutting of 4-10cm length than in long cuttings. Relative increased volume of rhizomes was highest in medium cuttings. The node numbers were not contributed to the efficiency of relative growth of rhizomes. This study suggests that medium length cutting is the best practice for the proliferation of M. trifoliata.

Data Envelopment Analysis(DEA) using Length Rate-based Efficiency Measurement (길이 비율 효율성 측정법을 이용한 자료포락분석)

  • Lee, Sang-Un
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.21 no.3
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    • pp.143-149
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    • 2021
  • This paper proposes length rate measurement for relative efficiency that is a core of data envelopment analysis(DEA). It has been said that the linear programming(LP) is a unique method to get the relative efficiency. This method has drawback that applies fractional LP focusing on each DMU in turn. This paper draws bi-dimensional input-output relational graph and distinguishes between efficient and inefficient DMU. The relative efficiency of inefficient DUM is solve using length rate measurement. As a result of various experimental data, the LP shows mistake of application, but this method gets the correct relative efficiency at all times. Also, this method only gets the relative efficiency for only inefficient DMUs without efficient DUMs that already achieved 100% efficiency. This method solves the relative efficiency of inefficient DUM draws the line to efficient frontier and decides the reference set easily.

Relative efficiency of monofilament and multifilament nylon gill net forMarbled sole (Pleuronectes yokohamae) in the western sea of Korea (그물실 종류에 따른 서해안 문치가자미 자망의 어획성능)

  • Kim, In-Ok;Park, Chang-Doo;Cho, Sam-Kwang;Kim, Hyun-Young;Cha, Bong-Jin
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.47 no.4
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    • pp.290-299
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    • 2011
  • Field tests were carried out with five different mesh sizes (86.6, 101.0, 121.2, 137.7, 151.5mm) to study the relative efficiency of monofilament and multifilament gill net for Marbled sole, Pleuronectes yokohamae, in the western sea of Korea, 2007-2009. The relative efficiency was analyzed by length distribution, catch in number, catch in weight and weight per individual for Marbled sole. Statistical T-test was done to verify the efficiency between two gears. In the field tests, the total body length range, catch in number and weight of Marbled sole was 15.8-48.2cm, 728 and 254,939g, respectively. During the field tests, Marbled sole less than 15cm length which is prohibition size of fishing was not caught, but the caught number of Marbled sole less than 19.5cm length which is first maturity length was 13 (1.8%) and the caught number of Marbled sole more than 19.5cm was 715 (98.2%). Catches of monofilament gill net was average 1.4 times more efficient than multifilament gill net. The weight per individual and total length by mesh sizes in the two gears tended to gradually increase according to mesh size increasing. But there was little difference of weight per individual and total length by mesh sizes between two gears.