• Title/Summary/Keyword: Chow

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The Effects of A High-Fat Diet on Pro- and Macro-Glycogen Accumulation and Mobilization During Exercise in Different Muscle Fiber Types and Tissues in Rats

  • Lee Jong-Sam;Eo Su-Ju;Cho In-Ho;Pyo Jae-Hwan;Kim Hyo-Sik;Lee Jang-Kyu;Kwon Young-Woo;Kim Chang-Keun
    • Nutritional Sciences
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    • v.8 no.3
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    • pp.181-188
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    • 2005
  • We investigated the effects of diet manipulation on pro- and macro-glycogen accumulation and mobilization during exercise in different kinds of muscle fiber and tissue. Thirty-two Sprague-Dawley rats were divided into groups representing one of two dietary conditions: high fat (HF, n=16) or standard chow (CHOW, n=16). Each dietary group was fm1her divided into control (REST, n=8) and exercise (EXE, n=8). After an eight-week dietary intervention period, the animals in EXE swam for 3 hours while the animals in REST remained at rest Skeletal muscle (soleus, red gastrocnemius and white gastrocnemius) and liver samples were then dissected out and used for analyses. 1here was no statistical difference in body weight between the animals in the HF and mow groups (p>.05). Three hours of exercise significantly increased plasma free fatty acid (FFA) concentration in the animals in the CHOW group but not in the animals in the HF group. Both citrate. synthase (CS) and $\beta$-hydroxyacyl dehydrogenase ($\beta$-HAD) activities in skeletal muscles were higher in the HF group than in the mow group. CS and $\beta$-HAD activities were also the highest in red gastrocnemius and the lowest in white gastrocnemius. At both time points (i.e., rest and immediately after exercise) intramuscular triglyceride (IMTG) and liver TG concentrations were significantly higher in the HF compared to the CHOW. IMTG and liver TG changed selectively in the CHOW. Except in white gastrocnemius muscle, there was no significant difference in total glycogen content between HF and mow at rest. Although exercise significantly lowered total glycogen content in all groups and tissues (p<.05), the degree of reduction was markedly greater in the mow than in the HF. Whereas changes in proglycogen concentration showed a trend similar to those of total glycogen, alterations in macroglycogen concentrations clearly differed from those of total glycogen. Specifically, the degree of reduction of macroglycogen following three hours of exercise was substantially greater in the CHOW than in the HF. These results suggest that metabolic alterations induced by a long-term high fat diet may be caused by macro-glycogen rather than pro-glycogen.

Almost sure convergence for weighted sums of I.I.D. random variables (II)

  • Sung, Soo-Hak
    • Bulletin of the Korean Mathematical Society
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    • v.33 no.3
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    • pp.419-425
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    • 1996
  • Let ${X, X_n, n \geq 1}$ be a sequence of independent and identically distributed(i.i.d) random variables with EX = 0 and $E$\mid$X$\mid$^p < \infty$ for some $p \geq 1$. Let ${a_{ni}, 1 \leq i \leq n, n \geq 1}$ be a triangular arrary of constants. The almost sure(a.s) convergence of weighted sums $\sum_{i=1}^{n} a_{ni}X_i$ can be founded in Choi and Sung[1], Chow[2], Chow and Lai[3], Li et al. [4], Stout[6], Sung[8], Teicher[9], and Thrum[10].

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ON VOISIN'S CONJECTURE FOR ZERO-CYCLES ON HYPERKÄHLER VARIETIES

  • Laterveer, Robert
    • Journal of the Korean Mathematical Society
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    • v.54 no.6
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    • pp.1841-1851
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    • 2017
  • Motivated by the Bloch-Beilinson conjectures, Voisin has made a conjecture concerning zero-cycles on self-products of Calabi-Yau varieties. We reformulate Voisin's conjecture in the setting of $hyperk{\ddot{a}}hler$ varieties, and we prove this reformulated conjecture for one family of $hyperk{\ddot{a}}hler$ fourfolds.

An Analysis on Hydrologic Characteristics of Design Rainfall for the Design of Hydraulic Structure (수공구조물 설계를 위한 설계강우의 수문학적 특성 분석)

  • Lee, Jeong-Sik;Lee, Jae-Jun;Park, Jong-Yeong
    • Journal of Korea Water Resources Association
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    • v.34 no.1
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    • pp.67-80
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    • 2001
  • This study is to propose temporal pattern of design rainfall which causes maximum peak discharge and to analyze the variation in peak discharge according to design rainfall durations. In this study, the Mononobe, the Yen and Chow triangular, the Huff's 4th quartiles and the Keifer and Chu methods are applied to estimate the proper temporal pattern of design rainfall and three rainfall-runoff models such as SCS, Nakayasu, and Clark methods are used to estimate the runoff hydrograph. And to examine the variability of peak discharge, the hydrologic characteristics from the rainfall-runoff models to which uniform rainfall intensity is applied are used as the standard values. The type of temporal pattern of design rainfall which causes maximum peak discharge in both of the watersheds and the rainfall-runoff models has resulted in Yen and Chow distribution method with the dimensionless vague of 0.75. On the basis of determined temporal pattern, the examination of the variability of peak discharge according to design rainfall durations shows that design rainfall duration varies greatly with the types of probable intensity formula, and the variation of peak discharge is more affected by the types of probable intensity formula and I-D-F currie than rainfall-runoff models.

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A Comparative Study of Statistical Methods for Population Bioequivalence in 2 X 2 Crossover Design (2 X 2 교차설계법에서 모집단 생물학적 동등성 검정 방법 비교)

  • Park Sang-Gue;Lim Nam-Kyoo;Lee Jae-Young;Kim Byung-Chun
    • The Korean Journal of Applied Statistics
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    • v.18 no.1
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    • pp.159-171
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    • 2005
  • The US Food and Drug Administration(FDA) recommends that population bioequivalence and individual bioequivalence would be assessed to address the prescribability and switchability between a brand-name drug and its new formulation or generic copy in its 2001 guidance document. The test for population bioequivalence in the latest FDA guidance is recommended in 2 x 4 crossover design, but it turns out to be very conservative. Recently Lee, Shao & Chow(2002), Chow, Shao & Wang(2003) and McNally, Iyer & Mathew(2002) proposed new statistical methods for assessing population bioequivalence between drugs to correct the biasness of current FDA method. Since 2 x 2 crossover experiment is most welcomed design in bioequivalence testing, we adopt their methods to 2 x 2 crossover designs and compare their methodologies with FDA one through the simulation study.

Effect of exercise and diet intervention on endoplasmic reticulum (ER) stress in rat skeletal muscle and adipose tissue (운동부하가 고지방식이 유도 비만흰쥐의 골격근 및 지방조직의 ER (Endoplasmic Reticulum)스트레스에 미치는 영향)

  • Kim, Gi Chool;Park, Kyung Sil;Kim, Hyun Kook;Kim, Ki Hoon
    • Journal of Nutrition and Health
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    • v.45 no.5
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    • pp.420-428
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    • 2012
  • The purpose of this study is to investigate the effects of eight weeks high fat intake and regular exercise in skeletal muscle and adipose tissue for Endoplasmic Reticulum (ER) stress in rats. This experiment involved 32 subjects (sprague-dawley rats) divided into four groups as follows: chow group (Chow, n = 8), chow and exercise group (Chow + EX, n = 8), high fat diet-induced hyperlipidemia group (HF, n = 8), and HF and exercise group (HF + EX, n = 8). As a result, there were significant decrease in body weight and abdominal fat, and blood lipid level was significantly improved by exercise for eight weeks (p < .05). There were variables changed about the skeletal muscle and ER stress in GRP78, XBP-1, ATF4, CHOP and JNK mRNA. There increased in mRNA factor by exercise, especially GRP78, and ATF4 mRNA were significantly increased in exercise (p < .05). However, there were increased in adipose tissue by exercise and there were significantly decreased in mRNA factor by high fat diet (p < .05). Consequently, this study suggests that the consistent exercise was more improved of obesity factor, such as dyslipidemia, hyperlipidemia, hyperglycemia, as well as body weight or abdominal fat. The response of ER stress in adipose tissue and skeletal muscle were more sensitive in exercise than high fat diet feed.

Invariant causal prediction for time series data: Application to won dollar exchange rate data (시계열 자료에서 불변하는 인과성 탐색: 원-달러 환율 데이터에 적용)

  • Kim, Mijeong
    • The Korean Journal of Applied Statistics
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    • v.34 no.5
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    • pp.837-848
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    • 2021
  • Evaluating or predicting the effectiveness of economic policies is an important issue, but it is difficult to find an economic variable which causes a significant result because there are numerous variables that cannot be taken into account. A randomized controlled experiment is the best way to investigate causality, but it is not realistically possible to control through randomization and intervention in time series data such as macroeconomic data. Although some analysis methods have been proposed to find causality, the methods such as Granger causality method and Chow test are insufficient to explain causality. Recently, Pfister et al. (2019) proposed invariant causal prediction methods which can be applicable in time series data. In this paper, we introduce the method of Pfister et al. (2019) and use the method to find macroeconomic variables invariantly affecting the won-dollar exchange rate.

Improvement in efficiency on ID-based Delegation Network (ID 기반 위임 네트워크의 성능 개선방안)

  • Youn, Taek-Young;Jeong, Sang-Tae;Park, Young-Ho
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.17 no.3
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    • pp.17-25
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    • 2007
  • Delegation of signing capability is a common practice in various applications. Mambo et al. proposed a proxy signatures as a solutions for delegation of signing capability. Proxy signatures allow a designated proxy signer to sign on behalf of an original signer. After the concept of proxy signature scheme is proposed, many variants are proposed to support more general delegation setting. To capture all possible delegation structures, the concept of delegation network was proposed by Aura. ID-based cryptography, which is suited for flexible environment, is desirable to construct a delegation network. Chow et al proposed an ID-based delegation network. In the computational point of view, their solution requires E pairing operations and N elliptic curve scalar multiplications where E and N are the number of edges and nodes in a delegation structure, respectively. In this paper, we proposed an efficient ID-based delegation network which requires only E pairing operations. Moreover, we can design a modified delegation network that requires only N pairing operations.

A White Box Implementation of Lightweight Block Cipher PIPO (경량 블록 암호 PIPO의 화이트박스 구현 기법)

  • Ham, Eunji;Lee, Youngdo;Yoon, Kisoon
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.32 no.5
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    • pp.751-763
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    • 2022
  • With the recent increase in spending growth in the IoT sector worldwide, the importance of lightweight block ciphers to encrypt them is also increasing. The lightweight block cipher PIPO algorithm proposed in ICISC 2020 is an SPN-structured cipher using an unbalanced bridge structure. The white box attack model refers to a state in which an attacker may know the intermediate value of the encryption operation. As a technique to cope with this, Chow et al. proposed a white box implementation technique and applied it to DES and AES in 2002. In this paper, we propose a white box PIPO applying a white box implementation to a lightweight block cipher PIPO algorithm. In the white box PIPO, the size of the table decreased by about 5.8 times and the calculation time decreased by about 17 times compared to the white box AES proposed by Chow and others. In addition, white box PIPO was used for mobile security products, and experimental results for each test case according to the scope of application are presented.