• Survey Research
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• v.7 no.2
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• pp.39-52
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• 2006

Most of Korean survey institutions adopt quota sampling for telephone surveys based on region, gender and age-band. In weekdays, it is well blown that there exist substantial differences in day time in-house rate by individual's socio-demographic attributes. So, quota sampling may induce systematic respondent selection bias. To solve the problem, we propose "time-balanced quota sampling" in which interviewer's call time-band is added as an quota variable. Furthermore, we propose "time-balanced quasi-quota sampling" which is derived by partially relaxing evening time quotas in time-balanced quota sampling. We compare the conventional and the newly proposed quota sampling schemes by drawing Monte Carlo samples from the hypothetical population for which the Korea 2004 time use survey data is assumed.

• Proceedings of the Korean Society of Computer Information Conference
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• 2016.01a
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• pp.73-74
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• 2016

네트워크 연구 분야에서 실시간 시나리오로 네트워크를 구성하는 것은 제약 사항이 많다. 단 하나의 테스트 베드도 비용과 시간을 굉장히 많이 소모하기 때문에 실제로 네트워크 전체를 구성하는 것 또한 쉽지 않으며 비용소모가 크다. 시뮬레이터는 이러한 실제 비용과 시간의 제약사항을 완화하여 시스템이 어떻게 동작 할지 알아보는데 도움을 준다. 본 논문에서는 서로 다른 몇 가지 네트워크 시뮬레이터의 주요 기능을 소개하고 장점과 단점을 도출해냈다.

• Journal of Industrial Convergence
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• v.18 no.3
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• pp.45-51
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• 2020

The purpose of this study was to examine the effects of Nursing ethics education(NE) on Spiritual well-being(SW), Attitude toward death(AD) and Perception of hospice palliative care(PH) in nursing students. This research used a one group pretest-posttest experimental design. Thirty hours NE program was given to 42 nursing students for six weeks. The collected data were analyzed using descriptive statistics and paired t-test with SPSS 18.0. program. As a result, there are no significant effects of NE on SW, AD and PH. However, it was found one thing interest that neither our nursing ethics education program nor others' had significant effects on attitude toward death. Nurses provide care to people at the end of their lives more often than any other healthcare provider. Therefore it is necessary to study the development of educational programs improving positive attitude toward death.

• Journal of Sensor Science and Technology
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• v.7 no.6
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• pp.386-393
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• 1998

We have carried out the measurements of complex dielectric constants with impedance/gain-phase analyzer using capacitor method and the experiments of high temperature X-ray powder diffraction with X-ray diffractometer using ${\theta}-2{\theta}$ scan method for the KTP single crystal which has the premium nonlinear optical properties. From the results of high temperature X-ray powder diffraction experiments, we have found that KTP does not undergo structural phase transition below $900^{\circ}C$. It is clear that KTP undergoes structural phase transition around $900^{\circ}C$ and belongs to orthorhombic above $900^{\circ}C$ still. However, we have applied phenomenological relation of dielectric relaxation to the results of complex dielectric measurement and have found that relaxation mechanism of KTP well satisfies the Cole-Cole relation over the temperature range from $-78^{\circ}C$ to $200^{\circ}C$. And also the relaxation time well satisfies the Vogel-Fulcher relation. It is regarded that the hopping and thermally activated diffusion mechanism may control the conduction behavior of KTP above $200^{\circ}C$.

• Journal of Convergence for Information Technology
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• v.10 no.7
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• pp.84-97
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• 2020

This pilot study evaluated the reach and efficacy of nurse training program to provide palliative care to patients with advanced chronic diseases. A mixed method was used (an one-group pre-post research design and a group interview). To examine the changes in knowledge, attitude and self-efficacy, paired t-test were used with SPSS 21.0. To obtain pivoting information in real settings, a content analysis was conducted in the data obtaining from a group interview. There were significant improvements on knowledge and self-efficacy scores after the program. Additionally, high retention rate and program satisfaction were found in the participants while recruitment strategies, especially nurses working for tertiary hospitals, need to be modified in future research. A full-fledged research is warranted to find effective strategies to implement and disseminate the program for nurses working in diverse settings.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.5
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• pp.2267-2277
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• 2012

The purpose of this study was to evaluate the effects of 7 minutes a day, 3 times a week, for 4 weeks of abdominal meridian massage with aroma oils (AMMAO) by Volunteers on the relief of constipation among hospitalized disability patients with brain lesions. One group pretest-posttest quasi experimental research design was used. Subjects were 38 hospitalized disability patients with brain lesions. Data were collected from May 9 to June 19, 2011. Frequencies, mean, standard deviation and Repeated Measures ANOVA with SPSS 19.0 were used to evaluate the effects of AMMAO. The results were as follows; 1. There were significant difference noted in the amount of defecation(F=3.56, p=.033) by time. 2. There were no significant difference was noted in the frequency of defecation, the frequency of suppository or enema application by time. Accordingly, it is concluded that AMMAO would be an effective nursing intervention in relief of constipation among hospitalized disability patients with brain lesions. Therefore it is recommended that AMMAO be used in clinical practice as an effective nursing intervention for hospitalized disability patients with brain lesions.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.7
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• pp.487-495
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• 2020

This study examined the effects of auricular acupressure on female college students with functional constipation to propose auricular acupressure as an effective and evidence-based nursing intervention. This is an experimental study designed with randomization and single-blind in a Sham-control approach. The subjects included 44 female college students with functional constipation whose symptoms met the Rome IV criteria. In this study, five different acupressure sites were applied to each group; the experimental group (n=23) received auricular acupressure on rectum, large intestine, lung, san jiao, and shenmen, whereas the Sham control group (n=21) received acupressure on ankle, helix, tooth, jaw, and external ear. The intervention was implemented once a week for a total of six weeks. After six weeks, the severity of constipation, stool form, and quality of life regarding constipation in the experimental group significantly improved compared to that of the Sham control group (p<.001). Consequently, the study showed that auricular acupressure can be used as an effective nursing intervention to alleviate constipation in female college students.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.40 no.8
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• pp.1521-1531
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• 2015

According to the service attributes, D2D communications establish 1-1, or 1-n channels and require the differentiated device discovery technology. This paper proposes a sector-based device discovery mechanism for 1-n D2D communication scenario in LTE-Advanced networks that a disaster happened. Our proposal is a mechanism that can extend the coverage in a disaster situation which a number of devices(survivors) need to be discovered in a short time. In the single cell environment, a larger discovery coverage can be obtained, and in the multi-cell, it is possible to mitigate the interference with adjacent links due to sector-based coverage control. Through a set of simulations, we have confirmed that our proposal has better performance in the number of devices discovered and the interference than the legacy broadcast device discover mechanism.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.13 no.1
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• pp.81-87
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• 2020

Recently, the network configuration is being rapidly changed to enable easy and free network service configuration based on SDN/NFV. Despite the many advantages and applications of SDN, many security issues such as Distributed Denial of Service (DDoS) attacks are being constantly raised as research issues. In particular, the effectiveness of DDoS attacks is much faster, SDN is causing more and more fatal damage. In this paper, we propose an entropy-based technique to detect and mitigate DDoS attacks in SDN, and prove it through experiments. The proposed scheme is designed to mitigate these attacks by detecting DDoS attacks on single and multiple victim systems and using time - specific techniques. We confirmed the effectiveness of the proposed scheme to reduce packet loss rate by 20(19.86)% while generating 3.21% network congestion.

• Journal of the Korean Society of Visualization
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• v.20 no.3
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• pp.74-85
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• 2022

We propose a Cubic-Interpolated Pseudo-Particle Lattice Boltzmann method (CIP-LBM) for the convection-diffusion equation (CDE) based on the Bhatnagar-Gross-Krook (BGK) scheme equation. The CIP-LBM relies on an accurate numerical lattice equilibrium particle distribution function on the advection term and the use of a splitting technique to solve the Lattice Boltzmann equation. Different schemes of lattice spaces such as D1Q3, D2Q5, and D2Q9 have been used for simulating a variety of problems described by the CDE. All simulations were carried out using the BGK model, although another LB scheme based on a collision term like two-relation time or multi-relaxation time can be easily applied. To show quantitative agreement, the results of the proposed model are compared with an analytical solution.