• Title/Summary/Keyword: Using frequency and period

Search Result 1,565, Processing Time 0.029 seconds

Analysis of the Relationship between Human Risk Factors and Evacuation Behavior for Tunnel Safety (터널안전에 대한 인적위험 요소와 대피행동 간의 관계분석)

  • Baek, Chung-Hyun;Park, Sea-Man;Choi, Byong-Jeong
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.20 no.7
    • /
    • pp.535-546
    • /
    • 2019
  • The purpose of this research was to analyze the relationship between human risk factors and evacuation behavior stages for tunnel safety. Therefore, we conducted a survey using a structured questionnaire on the relationship between safety facilities and safety behavior in order to derive an optimized interaction between the two. The research subjects were 141 tunnel users who understand the tunnel environment. The survey period was from June 24, 2018, to September 28, 2018. As data analysis methods, we employed a frequency analysis, a multiple regression analysis, and an independent-sample t-test. In the analysis of the correlation between the human risk factors and the major variables of evacuation behavior, the evacuation phases 1, 2, and 3 were all correlated with acceleration and delay, and the human risk factors were partially correlated. In the multiple regression analysis, the will to comply with laws (${\beta}=0.188$, p=0.034) and information recognition within the tunnel (${\beta}=0.220$, p=0.009) were factors that influence the relationship between human risk factors and evacuation behavior, indicating 12% explanatory power of the impact of human risk factors for the acceleration of evacuation behavior 3. The important variables between human risk factors and evacuation behavior were compliance with laws and information recognition in tunnels. Hence, it is necessary to study the elements that interact with the environment in the tunnel.

Effect of Restaurant Meal Replacement Product Selection Attributes on Brand Image and Satisfaction (RMR(레스토랑간편식) 상품의 선택속성이 브랜드이미지, 만족도에 미치는 영향)

  • Kim, Chan-Woo;Lee, Kang-Yeon
    • The Journal of the Korea Contents Association
    • /
    • v.20 no.12
    • /
    • pp.471-481
    • /
    • 2020
  • This study aims to investigate the relationship between the factors of RMR product selection attributes, brand image, and satisfaction as the interest and frequency of use of RMR products of dining out consumers increase recently. Convenience sampling was used for consumers with experience in using RMR products launched in catering companies and restaurants. The investigation period was conducted for about 20 days from August 10, 2020. The final 291 copies were used for research analysis, and the SPSS 21.0 statistical package program was used for hypothesis verification. As a result of the analysis, the hygiene (��=.160), menu (��=.203), and packaging (��=.291) of Hypothesis 1 had a significant effect on reliability. Hypothesis 2's menu (��=.270), convenience (��=.201), and packaging (��=.195) were found to have a significant effect on differentiation. The reliability (��=.328) and differentiation (��=.443) of the brand image of Hypothesis 3 were found to have a significant effect on satisfaction (��=.428). Hygiene (��=.388), menu (��=.229), and convenience (��=.243) of Hypothesis 4 were analyzed to have a significant effect on satisfaction. Lastly, this study is expected to be provided as basic research data related to RMR products, and is intended to be presented as a theoretical basis for the use of marketing and direction in RMR product development of food service companies and restaurants.

A Study on the Form of Modal Music used in K-Pop (K-Pop에서 사용된 선법음악 형태에 관한 연구)

  • Kim, Jin-Seon;Chung, Jae-Youn
    • Journal of Korea Entertainment Industry Association
    • /
    • v.13 no.6
    • /
    • pp.25-32
    • /
    • 2019
  • According to a recent KOFICE survey, K-Pop's popularity factor is divided into visual and auditory elements, and the importance of hearing elements is found. Among the various types of singers, idol groups led K-Pop and Black Pink, which topped the list of favorite K-Pop singers in 2018, was selected as the study target. In addition, Twice's music, which is similar to Black Pink's period of activity, has been set as a comparative research scope. The common features in the music of the two groups are the chorus and rhythm structure implemented around melody and Harmony rhythm, and the frequency of use of Major and Minor is greatly different. Through this method and modal interchange, K-Pop from 2016 to 2018 is analyzed. Research shows that first, more than one mode is used as a main melody. When more than one mode is used, different lines in the same line will vary depending on the functional form of the song. Second, the rhythm of the melody expressed with vocals and instruments is repeated based on a two-bar pattern. Finally, when using less chord and slowly expressing the igneous rhythms, there is a way to omit or modify the third notes that determine chord characteristics. Through this study, we can see that the usage patterns of the mode and modal interchange are divided according to the major and minor.

The Effects of Case-Based Learning (CBL) on Problem Solving Ability and Academic Self-efficacy in Nursing Students (사례기반학습을 적용한 수업이 간호대학생의 문제해결능력과 학업적 자기효능감에 미치는 효과)

  • Jin Hye Kyung;Yun Mi Jin
    • The Journal of the Convergence on Culture Technology
    • /
    • v.9 no.6
    • /
    • pp.1143-1149
    • /
    • 2023
  • The purpose of this study was to the effects of case-based learning (CBL) on problem solving ability and academic self-efficacy in nursing students and was a quasi-experimental study with a one-group pretest-posttest design. The subjects of this study were 121 grade 4 students, and the data collection period was from Aprill 24 to June 12, 2023. The research procedure was scenario development, preliminary investigation, application of case-based learning classes, and follow-up investigation, and the CBL was conducted for 2 weeks, 50 minutes per week. The general characteristics of the subjects were obtained by frequency, percentage, mean, and standard deviation and the effects of CBL on problem solving ability and academic self-efficacy was tested using a paired t-test. The results of this study showed that nursing students' problem solving ability (t=-5.70, p<.001) and academic self-efficacy (t=-3.25, p<.002) improved after applying CBL compared to before applying it. We suggest the use of case-based learning as a strategy to improve problem-solving skills and academic self-efficacy in nursing education. In the future, follow-up research is needed to verify the effectiveness by developing and applying step-by-step clinical cases at an appropriate level according to the learning content of nursing major subjects by grade.

An Experimental Study on the Estimation Method of Overtopping Discharge at the Rubble Mound Breakwater Using Wave-Overtopping Height (월파고를 이용한 사석경사제의 월파량 산정방법에 관한 실험적 연구)

  • Dong-Hoon Yoo;Young-Chan Lee;Do-Sam Kim;Kwang-Ho Lee
    • Journal of Navigation and Port Research
    • /
    • v.48 no.3
    • /
    • pp.192-199
    • /
    • 2024
  • Wave overtopping is a significant natural hazard that occurs in coastal areas, primarily driven by high waves, particularly those generated during typhoons, which can cause coastal flooding. The development of residential and commercial areas along the coast, driven by increasing social and economic demands, has led to a concentration of people and assets in these vulnerable areas. This, coupled with long-term sea level rise and an increase in typhoon frequency, has heightened the risk of coastal hazards. Traditionally, the evaluation of wave overtopping volumes has relied on directly measuring the collected volume of water that exceeds the crest height of structures through hydraulic model experiments. These experiments are averaged over a specific measurement period. However, in this study, we propose a new method for estimating individual wave overtopping volumes. We utilize the temporal variation of wave overtopping heights to develop an observation system that can quantitatively assess wave overtopping volumes in actual coastal areas. To test our method, we conducted hydraulic model experiments on rubble mound breakwaters, which are commonly installed along the Korean coast. We introduce wave overtopping discharge coefficients, assuming that the inundation velocity from the structure's crest is the long-wave velocity. We then predict overtopping volumes based on wave overtopping heights and compare and review the results with experimental data. The findings of our study confirm the feasibility of estimating wave overtopping volumes by applying the overtopping discharge coefficients derived in this study to wave overtopping heights.

An Analysis on Management Efficiency of The Regional Public Hospitals Using D.E.A (DEA를 이용한 지방의료원 경영효율성 분석)

  • Kim, Young-Jong;Kim, Kwang-Hwan
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.21 no.8
    • /
    • pp.512-520
    • /
    • 2020
  • This study analyzed the relative operational efficiency and impact factors of regional public hospitals to present benchmarking points for enhancing the efficiency of inefficient regional public hospitals. The survey targets collected and utilized the internal resources and management performance data from 34 regional public hospitals in Korea over the past five years, from 2014 to 2018. The final 33 regional public hospitals were surveyed, excluding Jinan Regional Public Hospital, which opened in 2015, the middle of the survey period. The general characteristics and input/output variables were analyzed by frequency analysis and technical statistics analysis, and Data Envelopment Analysis was performed to measure the operational efficiency index and relative comparison. According to the study, there were 11 efficient hospitals (33.3%) and 22 inefficient hospitals (66.7%). Of the 22 inefficient hospitals, 13 (IRS: Increasing Returns to Scale) required scale expansion, and nine (DRS: Decreasing Returns to Scale) required scale reduction or rebalancing. The significance of this study was that an analysis of the relative efficiency and influencing factors presented specific alternatives or directions that could help enhance the efficiency of the growth of regional public hospitals, sustainable management, and expansion of publicness.

High Efficiency Triple Mode Boost DC-DC Converter Using Pulse-Width Modulation (펄스폭 변조를 이용한 고효율 삼중 모드 부스트 변환기)

  • Lee, Seunghyeong;Han, Sangwoo;Kim, Jongsun
    • Journal of the Institute of Electronics and Information Engineers
    • /
    • v.52 no.2
    • /
    • pp.89-96
    • /
    • 2015
  • This paper presents a high efficiency, PSM/DCM/CCM triple mode boost DC-DC converter for mobile application. This device operates at Pulse-Skipping Mode(PSM) when it enters light load, and otherwise operate the operating frequency of 1.4MHz with Pulse-Width Modulation(PWM) mode. Especially in order to improve the efficiency during the Discontinuous-Conduction Mode(DCM) operation period, the reverse current prevention circuit and oscillations caused by the inductor and the parasitic capacitor to prevent the Ringing killer circuit is added. The input voltage of the boost converter ranges from 2.5V ~ 4.2V and it generates the output of 4.8V. The measurement results show that the boost converter provides a peak efficiency of 92% on CCM and 87% on DCM. And an efficiency-improving PWM operation raises the efficiency drop because of transition from PWM to PFM. The converter has been fabricated with a 0.18um Dongbu BCDMOS technology.

VARIABLE STARS IN THE REGION OF THE OPEN CLUSTER NGC 1039 (M34) (산개성단 NGC 1039(M34) 영역의 변광성)

  • JEON, YOUNG-BEOM;PARK, YOON-HO;LEE, SANG-MIN;LEE, UIRYEOL;KIM, DONGHYEON;JANG, HYEEUN;CHO, SUNGYOON
    • Publications of The Korean Astronomical Society
    • /
    • v.30 no.3
    • /
    • pp.821-832
    • /
    • 2015
  • As a part of the short-period variability survey (SPVS) at Bohyunsan Optical Astronomy Observatory, we obtained time-series BV CCD images in the region of the open cluster NGC 1039 (M34). The observations were performed for 22 nights from July 29, 2008 to September 26, 2010. We also made LOAO observations for 10 days from September 18, 2009 to October 30, 2010 to confirm the small variabilties of ${\delta}$ Scuti-type variable stars. In this paper we presented the observational properties of 28 variable stars found in the region. They are seven ${\delta}$ Scuti-type variable stars, two ${\gamma}$ Doradus-type variable stars, four-teen eclipsing binary stars and five semi-long periodic or slow irregular variables, respectively. Only three variables were listed in the GCVS and the rest are newly discovered ones. We have performed multiple-frequency analysis to determine pulsation frequencies of the ${\delta}$ Scuti-type and ${\gamma}$ Doradus-type variable stars, using the discrete Fourier transform and linear least-square fitting methods. We also have derived the periods and amplitudes of 12 eclipsing binaries from the phase fitting method, and presented the light curves of all variable stars.

A Study on Health Perception and Health Promoting Behavior in the Elderly (노인의 건강지각과 건강증진행위)

  • Lee, Kyeong-Sook;Chung, Young-Sook
    • Research in Community and Public Health Nursing
    • /
    • v.9 no.1
    • /
    • pp.72-88
    • /
    • 1998
  • This study was designed to identify the relationship between health perception arid health promoting behavior in the elderly. The subjects for this study were 92 persons over 65, who could be easily met in households, pavilions for the aged, and parks. The data were collected during the period from March 24th to April 12th, 1997 by interviews with a structured questionnaire. The instruments used for this study are as follows: The Health Perception Questionnaire developed by Ware (1979) and translated by Yu Ji-Su(1985). The Health Promotion Lifestyle Profile(HPLP) developed by Walker, Sechrist & Pender (1987) and partially amended by the author of this study. The Health Promotion Lifestyle Profile(HPLP) was parameterized by nutrition, exercise, stress management, self actualization, health responsibility, and interpersonal support. The data was analyzed by frequency, percentage, mean, standard deviation, t - test, ANOVA, and Pearson's correlation using an SPSS program. The results of this study were as follows: 1. Hypothesis 1 : 'The higher the level of health perception in the elderly, the higher the practice of health promoting behavior in the elderly' was supported(r=0.449, p<0.001). 2. The health perception mean score on a four point scale was 2.564. 3. For health promoting behavior, the mean score on a four point scale was 2.560. The factor of the highest mean score was interpersonal support(2.850) and factor of the lowest mean score was exercise(1.964). 4. Among the general characteristic variables, sex(t=4.12, p<0.001), religion(t=2.47, p<0.05), education(F=3.27, p<0.05), marital status (t=2.22, p<0.05), living situation(F=3.50, p<0.05), and hobby(t= -2.57, p<0.05) showed strong connections to health perception. 5. Among the general characteristic variables, religion(t = 1.83, p<0.05), and marital status(t= 2.12, p<0.05) showed strong connections to health promoting behavior. In conclusion, this study revealed that health perception is an important factor related to health promoting behavior in the elderly. The general characteristic variables showed strong connections to health perception and health promoting behavior. Therefore, nurses should consider health perception and general characteristic variables when they plan nursing intervention for the elderly. Also, educational programs encouraging constructive health perception should be developed.

  • PDF

Molecular Analysis of Bacterial Communities Distributed in Sea Water of Whitening Areas of Jeju Coast (제주연안 갯녹음(백화) 지역의 해수에 분포하는 세균군의 분자생물학적 분석)

  • 강형일;강봉조;김미란;윤병준;이동헌;오덕철
    • Korean Journal of Microbiology
    • /
    • v.38 no.2
    • /
    • pp.127-132
    • /
    • 2002
  • In this study, the bacterial communities distributed in sea water of the whitening areas of Gangjeong and Seongsan, Jeju-do have been analysed using the PCR amplification of 16S rRNA to obtain fundamental data and information on relationship of the whitening phenomenon and microbial ecosystem. In Gangjeong, diverse bacteria such as Alcanivorax, Paracoccus, Damselae, Pseudomonas, Rhodowlum, Silicibacter, Suiftobacter, and Roseobacter have been found, and Alcanivorax was the most abundant clone. The most abundant clone from Seongsan was Pseudomonas, of which Pseudomonas tolaasii and Pseudomonas mandeli were most abundantly occurred in the frequency of approx44% and 24%, respectively. Approx4% of the bacterial clones closest to Verrucomicrobiales and other unidentified clones were also fecund in Seongsan, suggesting there is a great discrepancy between bacterial communities from the whitening areas of Seongsan and Gangjeong. The mean temperature, chlorine concentration, pH, and dissolved oxygen (DO) of the sea water of Gangieong and Seongsan in August of 2001 (sampling period) was $27^{\circ}C$~$27.5^{\circ}C$, 30.24~30.60%, pH 8.23~8.36,7 .20~7.28 mg/ι, suggesting other environmental factors except far the factors mentioned above might result in difference of bacterial communities distributed in both areas.