• Title/Summary/Keyword: RED Parameters

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Evaluation of Black Soldier Fly Hermetia illucens Meal as a Fish Meal Replacement for Growing Red Seabream Pagrus major (육성기 참돔(Pagrus major) 사료내 어분대체원으로서 동애등에(Hermetia illucens) 분 대체율 평가)

  • Hyeon Jong Kim;Seong-Mok Jeong;Jin-Ho Bae;Kang-Woong Kim;Sang-Woo Hur
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.57 no.4
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    • pp.342-348
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    • 2024
  • This study evaluated the effects of defatted and non-defatted black soldier fly meal (BSFM) as a fish meal replacement in growing red seabream. Four isonitrogenous and isolipidic diets were formulated: 0% BSFM (D1), 5% defatted BSFM (D2), 5% non-defatted BSFM (D3), and 5% defatted + non-defatted BSFM (1:1, D4). A total of 360 growing red seabreams (mean ± SD body weight, 98.9±0.29 g) were equally distributed into 12 circular polyethylene tanks (1,000 L; 30 fish per tank; N=3 tanks per treatment). The red seabream were fed until satiation twice daily for 12 weeks. After 12 weeks, growth, feed utilization, whole-body proximate composition, blood parameters, and immune related parameters were measured. No significant differences were observed in weight gain, specific growth rate, feed conversion ratio, morphological parameters, plasma metabolites, plasma lysozyme, glutathione peroxidase, and superoxide dismutase among the experimental groups. However, immunoglobulin M (IgM) in fish fed D2 and D3 were significantly higher than those in fish fed D1. Additionally, the fish in D2 group showed higher IgM levels than those in the other treatment groups. These results indicate that defatted and non-defatted BSFM could be utilized as a potential feed ingredient for fishmeal replacement for red seabream.

Active Queue Management using Adaptive RED

  • Verma, Rahul;Iyer, Aravind;Karandikar, Abhay
    • Journal of Communications and Networks
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    • v.5 no.3
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    • pp.275-281
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    • 2003
  • Random Early Detection (RED) [1] is an active queue management scheme which has been deployed extensively to reduce packet loss during congestion. Although RED can improve loss rates, its performance depends severely on the tuning of its operating parameters. The idea of adaptively varying RED parameters to suit the network conditions has been investigated in [2], where the maximum packet dropping probability $max_p$ has been varied. This paper focuses on adaptively varying the queue weight $\omega_q$ in conjunction with $max_p$ to improve the performance. We propose two algorithms viz., $\omega_q$-thresh and $\omega_q$-ewma to adaptively vary $\omega_q$. The performance is measured in terms of the packet loss percentage, link utilization and stability of the instantaneous queue length. We demonstrate that varying $\omega_q$ and $max_p$ together results in an overall improvement in loss percentage and queue stability, while maintaining the same link utilization. We also show that $max_p$ has a greater influence on loss percentage and queue stability as compared to $\omega_q$, and that varying $\omega_q$ has a positive influence on link utilization.

An Effective RED Algorithm for Congestion Control in the Internet (인터넷에서 혼잡제어를 위한 개선된 RED 알고리즘)

  • Jung, Kyu-Jung;Lee, Dong-Ho
    • The KIPS Transactions:PartC
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    • v.10C no.1
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    • pp.39-44
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    • 2003
  • The network performance gets down during congestion periods to solve the problem effectively. A RED(Random Earl Detection) algorithm of the queue management algorithm is proposed and IETF recommends it as a queue management. A RED algorithm controls a congestion aspect dynamically. In analyzing parameters when static value of parameter is set in the gateway cannot be handled the status of current network traffic properly We propose the Effective RED algorithm to solve with the weakness of RED In this algorithm the maximum drop probability decides to accept or drop the interning packets, is adjusted dynamically on the current queue state for controlling the congestion phase effectively in the gateway. This algorithm is confirmed by computer simulation using the NS(Network Simulator)-2.

Improve ARED Algorithm in TCP/IP Network (TCP/IP 네트워크에서 ARED 알고리즘의 성능 개선)

  • Nam, Jae-Hyun
    • Journal of the Korea Society of Computer and Information
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    • v.12 no.3
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    • pp.177-183
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    • 2007
  • Active queue management (AQM) refers to a family of packet dropping mechanisms for router queues that has been proposed to support end-to-end congestion control mechanisms in the Internet. The proposed AQM algorithm by the IETF is Random Early Detection (RED). The RED algorithm allows network operators simultaneously to achieve high throughput and low average delay. However. the resulting average queue length is quite sensitive to the level of congestion. In this paper, we propose the Refined Adaptive RED(RARED), as a solution for reducing the sensitivity to parameters that affect RED performance. Based on simulations, we observe that the RARED scheme improves overall performance of the network. In particular, the RARED scheme reduces packet drop rate and improves goodput.

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Geophysical and mechanical investigation of different environmental effects on a red-bed soft rock dam foundation

  • Liming Zhou;Yujie Li;Fagang Wang;Yang Liu
    • Geomechanics and Engineering
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    • v.34 no.2
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    • pp.139-154
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    • 2023
  • Red-bed soft rock is a common stratum and it is necessary to evaluate the mechanical properties and bearing capacity of red-bed soft rock mass affected by different environmental effects. This paper presents a complete procedure for evaluating the bearing capacity of red-bed soft rock by means of geophysical exploration and in-situ rock mechanics tests. Firstly, the thickness of surface loosened rock mass of red-bed soft rock was determined using geophysical prospecting method. Then, three environmental effects, including natural weathering effect, dry-wet cycling effect and concrete sealing effect, were considered. After each effect lasted for three months, in-situ rock mass mechanical tests were conducted. The test results show that the mechanical properties of rock mass considering the sealing effect of concrete were maintained. After considering the natural weathering effect, the mechanical parameters decrease to a certain extent. After considering the effect of dry-wet cycling, the decreases of mechanical parameters are the most significant. The test results confirm that the red-bed soft rock dam foundation rock mass will be significantly affected by various environmental effects. Therefore, combined with the mechanical test results, some useful implementations are proposed for the construction of a red-bed soft rock dam foundation.

Quantifying Litterfall Input from the Stand Parameters of Korean Red Pine (Pinus densiflora S. et Z.) Stands in Gyeongnam Province

  • Kim, Choonsig;Baek, Gyeongwon;Choi, Byeonggil;Baek, Gyeongrin;Kim, Hojin
    • Journal of Korean Society of Forest Science
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    • v.110 no.4
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    • pp.569-576
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    • 2021
  • This study developed an estimation model for litterfall input using the stand parameters (basal area, stand density, mean DBH, and carbon stocks of the aboveground tree biomass) collected from the Korean red pine (Pinus densiflora S. et Z.) stands of seven regions in Gyeongsangnam-do. The mean annual litterfall was 2,779 kg ha-1 year-1 for needles, 883 kg ha-1 year-1 for miscellaneous, 611 kg ha-1 year-1 for broadleaved, 513 kg ha-1 year-1 for branches, and 340 kg ha-1 year-1 for bark litter. The mean annual total litterfall was 5,051 kg ha-1 year-1. Litterfall components were significantly correlated with stand parameters, except for broadleaved litter. A stronger correlation was observed between the carbon stock of the aboveground tree biomass and all the litterfall components compared with the other stand variables. The allometric equations for all the litterfall components were significant (P < 0.05), with the stand parameters accounting for 5%-43% and 8%-42% of the variation in the needle litter and total litterfall, respectively. The results indicated that the annual litterfall inputs of the Korean red pine stands on a regional scale can be effectively estimated by allometric equations using the basal area and carbon stocks of the aboveground tree biomass.

Study on a GIS Database of Red Tide Information System (적조정보시스템의 GIS데이터베이스화 연구)

  • Jeong Jong-chul
    • Spatial Information Research
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    • v.12 no.3
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    • pp.263-274
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    • 2004
  • The purpose of this study is to develop of red tide information system for spatial and temporal analysis of red tide including the outbreak season of red tide and biological-oceanography parameters using GIS techniques. The outbreaks of red tide were sporadic in the South Sea until 1994, but became frequent and widespread in whole coastal waters of the South Sea and East Sea since 1995. Therefore, the research fields of red tide has undergone a major changes. For monitoring of red tide, many kinds of techniques were carried out such as remote sensing, GIS and fuzzy model system. In this research, the development methods of red tide information system were suggested. For construction of the CIS based Red Tide database, spatial distribution area, species of red tide plankton and physical environment were analyzed.

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A Genome-wide Association Study of Copy Number Variation in Hematological Parameters in the Korean Population

  • Kim, Ka-Kyung;Cho, Yoon-Shin;Cho, Nam-H.;Shin, Chol;Kim, Jong-Won
    • Genomics & Informatics
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    • v.8 no.3
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    • pp.122-130
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    • 2010
  • Abnormal hematological values are associated with various disorders including cancer and cardiovascular, metabolic, infectious, and immune diseases. We report the copy number variations (CNVs) in clinically relevant hematological parameters, including hemoglobin level, red and white blood cell counts, platelet counts, and red blood cell (RBC) volume. We describe CNVs in several loci associated with these hematological parameters in 8,842 samples from Korean population-based studies. The data that we evaluated included four RBC parameters, one platelet parameter, and one associated with total white blood cell (WBC) count, exceeding the genome-wide significance. We show that CNVs in hematological parameters are associated with some loci, different from previously associated loci reported in single nucleotide polymorphism (SNP) association studies.

HST Pixel Analysis of NGC 5195

  • Lee, Joon-Hyeop;Kim, Sang-Chul;Ree, Chang-Hee;Kyeong, Jae-Mann;Sung, Eon-Chang;Chung, Ji-Won
    • The Bulletin of The Korean Astronomical Society
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    • v.36 no.1
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    • pp.59.1-59.1
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    • 2011
  • We report the HST pixel analysis results of the interacting S0 galaxy, NGC 5195 (M51B), using the HST/ACS images in the F435W, F555W and F814W (BVI) bands. After 4x4 binning of the HST/ACS images to secure sufficient signal-to-noise ratio for each pixel, we derive several quantities describing the pixel color-magnitude diagram (pCMD) of NGC 5195, such as blue/red color cut, red pixel sequence parameters, blue pixel sequence parameters and blue-to-red pixel ratio. Those parameters reflect the internal properties of NGC 5195 like age, metallicity, dust content and galaxy morphology. To investigate the spatial distributions of stellar populations, we divide pixel stellar populations using the pixel color-color diagram and population synthesis models. As a result, we find that the tidal interaction with NGC 5194 significantly affects the stellar populations in their dust content and mean stellar age.

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Study on recovery of heavy metals from red mud by using the ultrasonic waves (초음파를 이용한 레드머드로부터 유가금속 회수에 관한 연구)

  • Lim, Ki-Hyuk;Shon, Byung-Hyun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.1
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    • pp.906-913
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    • 2015
  • The red mud generated from the Bayer alumina production process seriously threatens the environment and human safety. Therefore, the reduction and recycling of red mud is an urgent topic in the aluminum industry. In this study, the effects of four parameters, ultrasound power, reaction temperature, time, and acid concentration, on the leaching of Fe, Al from red mud was investigated. The major parameters influencing the metal recovery efficiency from red mud were ultrasound power and reaction temperature. The use of ultrasonic irradiation resulted in 1.72 and 1.28 times higher recovery efficiency for Fe and Al, respectively. The proper conditions for the recovery of the metal components present in the red mud is the ultrasound intensity (150 W), sulfuric acid concentration (4-6N), reaction temperature ($70^{\circ}C$), and reaction time (2 hours), etc.