• Korean Journal of Ichthyology
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• v.34 no.2
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• pp.127-132
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• 2022

Most of the downstream of the river is blocked by beams, so fishways are required for the movement of conciliatory fish species and connection with the upstream. Therefore, it is very important as an ecological pier that can help free movement of fish. The three previously installed eel ladders use only brushes on the bottom. For find out the effect of the bottom material except to brush, experimented used model glass eel ladders to the ascent of glass eel. The eel ladder model was 1.2 m length, 0.3 m wide, and 0.1 m high, and three gravels of different particles were attached to the bottom of the fish ladder setting on the Geumgang Estuary Bank. The first model ladder was made of gravel with particles of 5 mm, and the second model ladder was made of gravel with particles of 2 mm. The third model ladder was made by solidifying with particles of 1 mm or less cement. All experiments were repeated 5 times for 1 hour. As a result of the experiment, the lower the angle, and the smaller the gravel particles, the more glass eels are ascended to the ladder, but the made of cement was nearly not ascent. The gravel-bottom model ladder has a lower discharge and flow rate than the brush ladder so more glass eels can ascent ladder, and if the glass eel ladder is improved through experiments applying various floor materials and variables in the future, more glass eels are going to ascent glass eel ladder.

• Composites Research
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• v.32 no.2
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• pp.108-112
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• 2019

There has been a continuous study on the weight reduction of structure by composites. Unlike isotropic materials, the physical properties of composites vary according to the direction of laminate and the order of lamination. Therefore, in the case of composite ladders, it is essential to perform structural analysis to verify the planned design. In this study, ladder was designed by applying fabric material. In addition, the effect of loading position on the ladder was analyzed through finite element analysis, and structural performance was analyzed by selecting the most problematic location. We analyzed the effect of stacking order on the structural strength of the ladder by analyzing the structure by applying various stacking sequence and measuring the failure value in each layer.

• Journal of Korean Academy of Nursing Administration
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• v.21 no.3
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• pp.233-242
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• 2015

Purpose: This was a correlational study to identify effects of perception of clinical ladder system on job satisfaction and intention to leave in perioperative nurses. Methods: Participants were 154 of perioperative nurses from larger general hospitals in Seoul. Data were collected from April, 16 to 22, 2013 using self-report questionnaires which included items on perception of clinical ladder system, job satisfaction, and intention to leave. Data were analyzed using frequency, t-test, ANOVA, $Scheff{{\acute{e}}$ test, Pearson correlation coefficients, and multiple stepwise regression. Results: The average mean score for perception of clinical ladder system was midline at 2.69 point out of 4 point. Perception of clinical ladder system correlated positively with job satisfaction (r=.38, p<.01) and negatively with intention to leave (r=-.88, p<.01). Perception of clinical ladder system was the factor which most influenced job satisfaction explaining 17.1% of the variance, also perception of clinical ladder system was the factor which most influenced intention to leave, explaining 12.7% of the variance. Conclusion: Results of this study suggest that there is a need to enhance the perception of the clinical ladder system and to find ways to fulfill the expected effects for improving perioperative nurses' job satisfaction and reducing the intention to leave.

• Journal of the Korean Society of Safety
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• v.39 no.2
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• pp.44-53
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• 2024

In addition to being used for ascending and descending to work locations, portable ladders are widely used as a substitute for work platforms when working at heights in homes and industrial sites. However, accidents continue to occur in industrial sites owing to structural instabilities of ladders and the negligence of safety measures by users. To prevent accidents involving workers using portable ladders, it is important to encourage workers to use them correctly through laws and regulations; however, establishing effective preventive measures that go beyond regulations can increase acceptance in industrial sites and maximize the effect of reducing industrial accidents. Therefore, this study conducts a fact-finding survey and portable safety ladder product analysis and collects stakeholder opinions to develop a Korean-style safety ladder that can replace step ladders with a high risk of accidents.

• The Journal of the Korea Contents Association
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• v.21 no.1
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• pp.511-519
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• 2021

This study examined the perception of life felt by low-income people in middle-aged and elderly people by enhancing the population structure of Korea, which is entering an aging society. For the analysis, the variables that need from the 2019 welfare panel data provided by the Ministry of Health and Welfare were selected. The final 1,684 samples were selected from the panel samples of 14,918 people, from the '60-70s' of 'low income class', by removing the unresponsive and insincere samples. In particular, this study defined as a dependent variable as a 'ladder of life' measured in panel data, and analyzed the personal characteristics and life satisfaction factors affecting 'ladder of life'. As a result of the analysis, most of the personal characteristics were found to be influential factors of the "ladder of life" when considering only personal characteristics as an influential factor for the dependent variable "ladder of life". Also, as a result of examining the interaction effect on the economic state variable, there was no significant interaction effect. This shows that the health condition is more important than the economic condition as the influential factor on the ladder of middle-aged elderly people. Therefore, the recognition of the elderly 'ladder of life' should improve the awareness of the elderly's life by various 'environmental factors', both internal and external, rather than the personal conditions and environment of the elderly. In other words, a plan to present a positive alternative to their perception of life will be needed.

• Journal of Naturopathy
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• v.11 no.2
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• pp.79-84
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• 2022

Background: Exercise influences the generation of brain cells through learning and experience in the process of acquiring motor skills and helps improve brain function. It is necessary to scientifically verify how brain wave activity, a method of analyzing brain function, affects movement. Purposes: We scientifically identify the positive effects on EEG activity when applying complex functional linear ladder movements in an appropriate environment. Methods: After recruiting 30 male university students, we divided them into a linear ladder exercise group, a treadmill exercise group, and a control group, and exercise was applied and measured repeatedly for ten weeks. Results: There was a statistically significant change between groups in the left prefrontal lobe of alpha waves when exercise was applied (p < .05). Conclusions: Although exercise has a positive effect on EEG, line ladder exercise, which applies a complex pattern and produces more leg movement, appears to have a better impact on brain function than traditional aerobic exercise.

• Transactions on Electrical and Electronic Materials
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• v.4 no.3
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• pp.5-9
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• 2003

In this paper, a layout-based CMOS RF model for RFIC's including the capacitance effect, the skin effect, and the proximity effect between metal lines on the Si surface is proposed for the first time for accurately predicting the RF behavior of CMOS devices. With these RF effects, the RF equivalent circuit model based on the layout of the multi-finger gate transistor is presented. The capacitances between metal lines on the Si surface are modeled with the layout. And the skin effect is modeled to the equivalent ladder circuit of metal line. The proximity effect is modeled by adding the mutual inductance between cross-coupled inductances in the ladder circuit representation. Compared to the BSIM 3v3 and other models, the proposed RF model shows better agreements with the measured data and shows well the frequency dependent behavior of devices in GHz ranges.

• Journal of the Korean Data and Information Science Society
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• v.19 no.4
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• pp.1419-1427
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• 2008

This paper shows the kernel Poisson regression which can be applied in the claims reserving, where the row effect is assumed to be a nonlinear function of the row index. The paper concentrates on the chain-ladder technique, within the framework of the chain-ladder linear model. It is shown that the proposed method can provide better reserve estimates than the Poisson model. The cross validation function is introduced to choose optimal hyper-parameters in the procedure. Experimental results are then presented which indicate the performance of the proposed model.

• Journal of Korean Clinical Nursing Research
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• v.16 no.3
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• pp.51-61
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• 2010

Purpose: The purpose of this study was to determine the effect of needs for professional development and organizational climate on organizational socialization of clinical nurses. A cross-sectional analysis were performed to assess the factors affecting organizational socialization. Methods: The data used in this study were obtained from clinical nurses who were employed in a hospital (N=606). Using multiple regression, we tested variables to assess their effects on organizational socialization in this sample. The data were analyzed using descriptive test, t-test, ANOVA, Pearson correlation coefficiency and stepwise multivariate regression. SPSS 17.0 program was utilized for data analysis. Results: The mean scores of organizational socialization, needs for professional development and organizational climate were statistically differed by career ladder, educational level and position. Organizational socialization had significant positive correlations with the needs for professional development (r=.332, p<.01) and organizational climate (r=.523, p<.01). Those variables including career ladder explained 33.4% of organizational socialization. Conclusion: Our findings indicate that organizational socialization of clinical nurses could be enhanced by meeting the needs for professional development and organizational climate. Developing innovative educations for encouraging clinical nurses' carrier development and creating a positive organizational climate are mandated for clinical nurses to have constructive organizational socialization.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.41 no.6
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• pp.91-98
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• 2004

This paper proposes a PCB plane model for generic SPICE circuit simulators. The proposed model reflects two frequency-dependent losses, namely skin and dielectric losses. After power/ground plane pair is divided into arrays of unit-cells, each unit-cell is modeled using a transmission line and two loss models. The loss model is composed of a resistor for DC loss, series HL ladder circuit for skin loss and series RC ladder circuit for dielectric loss. To verify the validity of the proposed model, it is compared with SPICE ac analysis using frequency-dependent resistors. Also, we show that the estimation results using the proposed model have a good correlation with that of VNA measurement for the typical PCB stack-up structure of general desktop PCs. With the proposed model, not only ac analysis but also transient analysis can be easily done for circuits including various non-linear/linear devices since the model consists of passive elements onl.