• Title/Summary/Keyword: Cross-tables

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A taxonomic study of Korean Juncus based on the anatomical characters (한국산 골풀속의 해부학적 형질에 의한 분류학적 연구)

  • Jang, Chang-Seok;Oh, Byoung-Un
    • Korean Journal of Plant Taxonomy
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    • v.46 no.4
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    • pp.392-404
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    • 2016
  • The anatomical characters of the 19 taxa of Korean Juncus were reviewed in order to examine their significance in taxonomy. Cross-section analyses were conducted on the stem, leaf, and capsule. Descriptions, line drawings, tables, and a species key of Korean Juncus are provided for species identification based on anatomical characters. The results of this study showed that the arrangements of the vascular bundle, fiber, and air-space structure in the stems as well as the arrangements of the vascular bundle and parenchyma in the leaves and the development of placenta in capsules are the key characters to be used when classifying each species of Juncus. It was revealed that the studied anatomical features were more useful for identification at the subgenera and section levels than at the species level. Therefore, these anatomical characters used in conjunction with external morphological features will make a valuable contribution to establishing a natural classification system for Juncus.

Strongest Static Arches with Constant Volume (일정체적 정적 최강아치)

  • Lee, Byoung Koo;Oh, Sang Jin;Lee, Tae Eun
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.29 no.5A
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    • pp.477-486
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    • 2009
  • This paper deals with the strongest static arches with the solid regular polygon cross-section. Both span length and volume of arch are always held constant regardless the shape functions of cross-sectional depth of regular polygon. The normal stresses acting on such arches are calculated when both static vertical and horizontal point loads are subjected. By using the calculating results of stresses, the optimal shapes of strongest static arches are obtained, under which the maximum normal stress become to be minimum. For determining the redundant of such indeterminate arches, the least work theorem is adopted. As the numerical results, the configurations, i.e. section ratios, of the strongest static arches are reported in tables and figures. The results of this study can be utilized in the field of the minimum weight design of the arch structures.

Depression, sleep quality, and body image disturbances among pregnant women in India: a cross-sectional study

  • Kranti S. Kadam;Aditya R. Anvekar;Vishnu B. Unnithan
    • Journal of Yeungnam Medical Science
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    • v.40 no.4
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    • pp.394-401
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    • 2023
  • Background: Pregnancy is associated with a number of physical, emotional, and biological changes that can exacerbate maternal psychological disturbances, such as body image concerns and depression. Sleep disturbances during pregnancy can also have adverse impacts. This study aimed to determine the prevalence of depression, sleep disturbances, and body image concerns among pregnant women. The study also examined the relationship between these factors and pregnancy-related variables, such as bad obstetric history and whether the pregnancies were unplanned. Methods: A cross-sectional study of 146 pregnant patients was conducted at a tertiary care center over 15 months. The patients were administered the Beck Depression Inventory, Pittsburgh Sleep Quality Index, and Body Image Concern Inventory questionnaires. Contingency tables, Fisher exact test, and Spearman correlation were used to identify underlying relationships. Results: The prevalence of depression was 22.6%. Although body image disturbance was noted in only 2.7% of patients, 46.6% had poor sleep quality. Poor sleep was associated with primigravida status. Bad obstetric history and unplanned pregnancy were associated with depression. Depression was found to be significantly correlated with body image disturbances and poor sleep quality. Conclusion: Psychiatric disorders were prevalent during pregnancy. This study highlights the importance of screening for depression in pregnant patients. Counselling and caregiver education can be useful for mitigating psychological disturbances. Management of pregnancies by multidisciplinary teams that include psychiatrists could be immensely useful in improving the pregnancy experiences of patients.

Differential transform method and Adomian decomposition method for free vibration analysis of fluid conveying Timoshenko pipeline

  • Bozyigit, Baran;Yesilce, Yusuf;Catal, Seval
    • Structural Engineering and Mechanics
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    • v.62 no.1
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    • pp.65-77
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    • 2017
  • The free vibration analysis of fluid conveying Timoshenko pipeline with different boundary conditions using Differential Transform Method (DTM) and Adomian Decomposition Method (ADM) has not been investigated by any of the studies in open literature so far. Natural frequencies, modes and critical fluid velocity of the pipelines on different supports are analyzed based on Timoshenko model by using DTM and ADM in this study. At first, the governing differential equations of motion of fluid conveying Timoshenko pipeline in free vibration are derived. Parameter for the nondimensionalized multiplication factor for the fluid velocity is incorporated into the equations of motion in order to investigate its effects on the natural frequencies. For solution, the terms are found directly from the analytical solution of the differential equation that describes the deformations of the cross-section according to Timoshenko beam theory. After the analytical solution, the efficient and easy mathematical techniques called DTM and ADM are used to solve the governing differential equations of the motion, respectively. The calculated natural frequencies of fluid conveying Timoshenko pipelines with various combinations of boundary conditions using DTM and ADM are tabulated in several tables and figures and are compared with the results of Analytical Method (ANM) where a very good agreement is observed. Finally, the critical fluid velocities are calculated for different boundary conditions and the first five mode shapes are presented in graphs.

Shrinkage Solution of Quantification Method III (수량화 제3 방법의 축소 해)

  • Huh Myung-Hoe;Lee Yong-Goo
    • The Korean Journal of Applied Statistics
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    • v.19 no.2
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    • pp.331-338
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    • 2006
  • Quantification method III is designed by C. Hayashi as visualizing technique for two-way cross-classified tables. Specially in Japan, its usefulness is timely proven in social and marketing surveys. In several instances, relatively large quantification scores are assigned to low-frequency categories. Thus, they lead to unreliable data interpretation. The aim of this study is to develop stable solution to overcome such traits of quantification method III. The solution is of shrinkage type induced by small perturbations and is applied to a multiple response data obtained in a Korean social survey.

Cooperative Robot for Table Balancing Using Q-learning (테이블 균형맞춤 작업이 가능한 Q-학습 기반 협력로봇 개발)

  • Kim, Yewon;Kang, Bo-Yeong
    • The Journal of Korea Robotics Society
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    • v.15 no.4
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    • pp.404-412
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    • 2020
  • Typically everyday human life tasks involve at least two people moving objects such as tables and beds, and the balancing of such object changes based on one person's action. However, many studies in previous work performed their tasks solely on robots without factoring human cooperation. Therefore, in this paper, we propose cooperative robot for table balancing using Q-learning that enables cooperative work between human and robot. The human's action is recognized in order to balance the table by the proposed robot whose camera takes the image of the table's state, and it performs the table-balancing action according to the recognized human action without high performance equipment. The classification of human action uses a deep learning technology, specifically AlexNet, and has an accuracy of 96.9% over 10-fold cross-validation. The experiment of Q-learning was carried out over 2,000 episodes with 200 trials. The overall results of the proposed Q-learning show that the Q function stably converged at this number of episodes. This stable convergence determined Q-learning policies for the robot actions. Video of the robotic cooperation with human over the table balancing task using the proposed Q-Learning can be found at http://ibot.knu.ac.kr/videocooperation.html.

Determinants of Marital Satisfaction among Male and Female Rural Migrants: Migrant Characteristics and Family Values (남녀 귀농인 결혼만족도 결정요인 연구: 귀농특성, 가족주의 가치관을 중심으로)

  • Kim, Beagsu;Lee, Jeonghwa
    • The Korean Journal of Community Living Science
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    • v.26 no.3
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    • pp.471-488
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    • 2015
  • This study compares marital satisfaction between male and female rural migrants and explores the effects of characteristics of rural migrants and family values on marital satisfaction. Data were collected using a structured questionnaire. The survey included 483 migrants living in rural communities of North Jeolla Province and South Jeolla Province. Data were analyzed using descriptive statistics, cross tables, the t-test, correlations, and a hierarchical regression analysis using SPSS 21.0. According to the results, marital satisfaction was higher in men than in women. In addition, the effects of characteristics of rural migrants and family values on marital satisfaction were greater in men than in women. The major determinant of marital satisfaction in men was economical preparation, whereas that in women was family values. Economical preparation for rural living was more important for men, and the sufficient understanding and internalization of rural living was more important for women. In particular, family values represented the main variable between men and women in terms of marital satisfaction. These results suggest that family relationships may be the most important factor influencing rural migrants' marital satisfaction and that spousal relationships may be the core factor influencing family relationships.

Static and Dynamic Optimal Shapes of Both Clamped Columns with Constant Volume (일정체적 양단고정 기둥의 정·동적 최적형상)

  • Lee, Byoung Koo;Kim, Suk Ki
    • Journal of Korean Society of Steel Construction
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    • v.19 no.1
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    • pp.99-106
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    • 2007
  • This paper deals with the static and dynamic optimal shapes of both clamped columns with constant volume. The parabolic taper with the regular polygon cross-section is considered, whose material volume and column length are held constant. Numerical methods are developed for solving natural frequencies and buckling loads of columns subjected to an axial compressive load. Differential equations governing the free vibrations of such column are derived. The Runge-Kutta method is used to integrate the differential equations, and the Regula-Falsi method is used to determine natural frequencies and buckling loads, respectively. From the numerical results, dynamic stability regions, dynamic optimal shapes and configurations of strongest columns are presented in figures and tables.

Experimental investigation of local damage in high strength concrete columns using a shaking table

  • Bairrao, Rogerio;Kacianauskas, Rimantas;Kliukas, Romualdas
    • Structural Engineering and Mechanics
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    • v.19 no.5
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    • pp.581-602
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    • 2005
  • In this paper the accumulation of local damage during the cyclic loading in reinforced high-strength concrete columns is experimentally investigated. Two identical column specimens with annular cross-section and spiral reinforcement were designed and two tests, up to failure, under the action of a constant vertical concentrated force and a time-dependent concentrated horizontal force, were carried out at the LNEC shaking tables facility. Sine type signals, controlled in amplitude, frequency and time duration were used for these experiments. The concept of local damage based on local stiffness degradation is considered in detail and illustrated by experimental results. The specimens were designed and reinforced in such a way that the accumulation of damage was predicted by dominating deformations (cracking and crushing of the concrete) while the increasing of the loading values was a dominating factor of damage. It was observed that the local damage of HSC columns has exposed their anisotropic local behaviour. The damage accumulation was slightly different from the expected in accordance with the continuum damage concept, and a partial random character was observed.

Numerical studies on the effects of the lateral boundary on soil-structure interaction in homogeneous soil foundations

  • Li, Z.N.;Li, Q.S.;Lou, M.L.
    • Structural Engineering and Mechanics
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    • v.20 no.4
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    • pp.421-434
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    • 2005
  • In this paper, the finite element method is applied to investigate the effect of the lateral boundary in homogenous soil on the seismic response of a superstructure. Some influencing factors are presented and discussed, and several parameters are identified to be important for conducting soil-structure interaction experiments on shaking tables. Numerical results show that the cross-section width L, thickness H, wave propagation velocity and lateral boundaries of soil layer have certain influences on the computational accuracy. The dimensionless parameter L/H is the most significant one among the influencing factors. In other words, a greater depth of soil layer near the foundation should be considered in shaking table tests as the thickness of the soil layer increases, which can be regarded as a linear relationship approximately. It is also found that the wave propagation velocity in soil layer affects the numerical accuracy and it is suggested to consider a greater depth of the soil layer as the wave propagation velocity increases. A numerical study on a soil-structure experimental model with a rubber ring surrounding the soil on a shaking table is also conducted. It is found the rubber ring has great effect on the soil-structure interaction experiments on shaking table. The experimental precision can be improved by reasonably choosing the elastic parameter and width of the rubber ring.