• International Journal of Aeronautical and Space Sciences
• /
• 제18권4호
• /
• pp.797-806
• /
• 2017

In this study, the reflection coefficient (RC) and the flame transfer function (FTF) were measured by applying acoustic excitation to a duct-type model combustor and were used to predict the frequency of the combustion instability (CI). The RC is a value that varies with the excitation frequency and the geometry of the combustor as well as other factors. Therefore, in this study, an experimentally measured RC was used to improve the accuracy of prediction in the cases of 25% and 75% hydrogen in a mixture of hydrogen and methane as a fuel. When the measured RCs were used, an unstable condition was correctly predicted, which had not been predicted when the RCs had been assumed to be a certain value. The reason why the CI occurred at a specific frequency was also examined by comparing the peak of the FTF with the resonance frequency, which was calculated using Helmholtz's resonator analysis and a resonance frequency equation. As the CI occurred owing to the interaction between the perturbation in the rate of heat release and that in the pressure, the CI was frequent when the peak of the FTF was close to the resonance frequency such that constructive interference could occur.

• 한국치위생학회지
• /
• 제15권5호
• /
• pp.849-856
• /
• 2015

Objectives: The purpose of the study is to investigate the influence of social characteristics and self leadership on stress coping method in the dental hygiene students. Methods: A self-reported questionnaire was completed by 436 dental hygiene students in J area from November 10 to December 10, 2013. The questionnaire consisted ofsocial characteristics of the subjects, self leadership, and stress coping method. The reliability was evaluated by Cronbach alpha. Data were analyzed by frequency, one-way ANOVA, multiple regression analysis using the SPSS 12.0 statistical package program. The self leadership was developed by Mans and adapted and modified by Kim and Park. The leadership included 18 questions of self expectation, rehearsal, goal setting, self reward, self criticism, and constructive area. The stress coping method was developed by Folkman and Lazarus, and adapted and modified by Park. The stress coping method included 24 questions of problem focused coping, seeking social support, emotion focused coping, and wishful thinking. Results: The best stress coping method was wishful thinking and the score was 2.81. The priority order of stress coping method included social support, problem focused coping, and emotion focused coping. The self-expectation, goal setting, self-criticism proved to be highly relevant factors. The explanation power of stress coping method was 29.1 percent. The self expectation, rehearsal, self reward, and self criticism were passive coping methods and the explanation power was 15.4 percent. Conclusions: The self leadership is the most important factor to fulfill the interpersonal relationship abilities, major satisfaction, and satisfaction with clinical practice. The self leadership leads to stress coping ability.

• 성인간호학회지
• /
• 제12권4호
• /
• pp.641-653
• /
• 2000

A quantitative descriptive survey was conducted to assess the needs of elderly people in relation to accessibility of medical care. Identifying their functional status was done and accessibility of medical care was ascertained. Using a convenient sampling method, 856 elderly aged 65 and over in Taejon-city participated. A multi-dimensional questionnaire containing sections on health status, Activities of Daily Living(ADLs) and accessibility of medical care in terms of use, time, distance, transport, cost and feeling at ease was developed by the researchers of this study to collect data. Data were collected between October and December, 1999. In general, the result of the self-reports from this study found that approximately 40% of participants had difficulties with their health status and ADLs while about 45% of the population did not access medical care. The majority of respondents stated that they had no difficulties with time distance and transport to access medical care. About two-thirds of the respondents felt that they had many or some difficulties with expenses and strategies for emergency to access medical care. Even though these findings need to be generalized, several recommendations for appropriate medical care delivery for the elderly still can be outlined from the study findings. Recommendations suggested are: To identify impediments to access medical care in emergency in elderly people and to remove those factors preventively are required. Responsible governmental involvement for solving problems of the medical care cost and additional costs in relation to separation of dispensary from medical practice for the elderly is required. More constructive and practical uses of public health community centers are recommended.

• 보건교육건강증진학회지
• /
• 제19권4호
• /
• pp.33-44
• /
• 2002

This study was conducted to investigate the relationship between an eating disorder, body image, depression and self-esteem amongst a subject group of 282 college women between Jan.,1st and 30th,2002, to provide base data for eating disorder levels of college women and to provide base data for health control. The evaluative instrument was a constructive questionnaire that consisted of 8 items of general characteristics and weight control questions, 24 questions relating to eating disorders, 17 questions pertaining to body image, 10 questions pertaining to depression and 10 questions pertaining to self-esteem. To identify the levels of an eating disorder, body image, depression and self-esteem perceived by subjects, the researcher used means and SDs. To test the significance of a subject's eating disorder, body image, depression and self-esteem according to the BMI, the researcher used the t-test. To test the correlation between the BMI, an eating disorder, body image, depression and self-esteem, the researcher used Pearson correlation coefficient. The results of this study are as follows. The mean score for anorexia nervosa was 31.52 and the mean score for bulimia nervosa was 24.12. Differences between the underweight group and the normal weight group in the level of eating disorders were significant (t=-6.94, p=.000). There were high positive correlations between the BMI and an eating disorder (r=.383, p<.01), between an eating disorder and depression (r=.161, p<.01), between body image and self-esteem (r=.653, p<.01). In addition, there were high negative correlations between an eating disorder and body image (r=-.214, p<01), between an eating disorder and self-esteem (r=-.196, p<.01), between depression and body image (r=-.541, p<.01), and between depression and self-esteem (r=-.537, p<.01). These results indicate that Korean college women need more education and counseling on dietary habits. Also, the systemic efforts reestablish the social standard of the beauty should be taken. Further empirical and experimental studies would be required for investigating for the factors influencing the eating attitude of the college women and discriminating the variables affecting the various specific dimensions of the eating attitude.

• 디지털융복합연구
• /
• 제18권7호
• /
• pp.405-410
• /
• 2020

패션은 미용과 함께 신분, 지위, 혼인 여부, 개인 성향 등을 표현하는 시각적 수단이며 과거의 생활습관까지 유추할 수 있는 중요한 실용문화 유산이다. 현대사회에서는 헤어, 메이크업, 네일아트 등의 미용뿐만 아니라 여성 정장, 하이힐, 모자, 장갑, 핸드백, 목걸이 등과 같은 패션도 여성의 사회적 존재를 부각하면서 경쟁력을 배가시키는 요인으로 작용한다. 봉건적 가치관과 고정관념에 저항하면서 시대적 선도성을 발휘한 일제 강점기 신여성은 혁신적 여성상의 모범이며 21세기 과학기술의 급진적 발전에 부응하는 여성성의 표본을 제시하기 때문에 진정한 양성평등(兩性平等) 사회를 향한 원동력이자 발전적 미래설계를 위한 발판으로 작용한다. 신여성들의 패션스타일에서 발산되는 여성성에 대하여 뷰티 전공 여대생 관점으로 요인을 분석한 본 연구를 통하여 건설적 자조론(自助論)을 정립한 여성성의 표본 제시가 가능해짐과 동시에 현대 여성들의 자존감 정립과 성공하는 혁신적 여성성의 확고한 기틀도 마련되리라 사료된다.

• 한국군사과학기술학회지
• /
• 제17권2호
• /
• pp.235-247
• /
• 2014

Based on two dimensional model partition method proposed in Part 1, Part 2 provides detailed model specification and implementation. To mathematically delineate a model's behaviors and interactions among them, we extend the DEVS (Discrete Event Systems Specification) formalism and newly propose CE-DEVS (Combat Entity-DEVS) for an upper abstraction sub-model of a combat entity model. The proposed CE-DEVS additionally define two sets and one function to reflect essential semantics for the model's behaviors explicitly. These definitions enable us to understand and represent the model's behaviors easily since they eliminate differences of meaning between real-world expressions and model specifications. For model implementation, upper abstraction sub-models are implemented with DEVSim++, while the lower sub-models are realized using the C++ language. With the use of overall modeling techniques proposed in Part 1 and 2, we can conduct constructive simulation and assess factors about combat logics as well as battle field functions of the next-generation combat entity, minimizing additional modeling efforts. From the anti-torpedo warfare experiment, we can gain interesting experimental results regarding engagement situations employing developing weapons and their tactics. Finally, we expect that this work will serve an immediate application for various engagement warfare.

• 정보처리학회논문지A
• /
• 제9A권4호
• /
• pp.631-638
• /
• 2002

가상학습을 지원하는 시스템은 경제적인 면과 운용의 편의성 및 효율성, 기능성을 고려하여 개발되어야한다. 또한 구성주의적 접근을 통한 시스템의 설계는 구성요소간 상호작용의 증대를 통해 사용자와 관리자의 편의성을 높일 수 있다. 가상학습 시스템 개발에서 편의성과 안정성, 경제성리 확보는 중요한 요소이며 이를 위해 가상학습의 각 구성요소의 관점을 고려한 체계적인 설계가 요구되며 다양한 설치 및 개발 환경에서 플랫폼에 독립적인 시스템의 개발이 필요하다. 본 연구에서는 구성주의적 관점 중에서 상호작용에 중점을 둔 접근을 통해 플랫폼에 독립적인 가상학습 시스템을 설계 및 구현하고 편의성 및 효율성을 분석하고 검증하였다. 개발한 시스템은 구성요소간의 상호작용과 객체를 기반으로 모듈로 설계하였고 APM을 기반으로 플랫폼 독립적인 개발을 통하여 이식성과 경제성을 향상시켜 가상학습 시스템의 개발 및 운영에 대한 비용과 노력의 절감을 가져올 수 있도록 하였다.

• 디지털융복합연구
• /
• 제17권2호
• /
• pp.9-18
• /
• 2019

본 연구에서는 현재 시행 중인 사이버 범죄 예방 교육의 효과성을 확인하기 위해 예방 교육 수강자의 교육 만족도와 학습 전이에 영향을 미치는 요인이 무엇인지 알아보고자 한다. 교육 평가에서 활용되는 CIPP 모형을 바탕으로 상황 평가의 사회 요구 수준과 지식수준, 투입 평가의 주제의 최신성, 과정 평가의 상호작용이 수강자의 교육 만족도와 산출 평가의 학습전이에 영향을 미치는지 확인하기 위해 예방 교육 수강자를 대상으로 설문조사를 실시하였다. 연구 분석 결과, 상황 평가의 지식수준과 투입 평가의 주제의 최신성, 과정 평가의 상호작용이 교육 만족도와 유의미한 관계를 가진다는 것이 확인되었고, 상황 평가의 주제의 최신성과 투입 평가의 상호작용, 교육 만족도가 산출 평가의 학습 전이와 유의미한 관계를 가진다는 것이 확인되었다. 본 연구 결과를 바탕으로 향후 사이버 범죄 예방 교육 프로그램의 운영 계획 수립 시 수강자의 학습 전이를 높일 수 있는 개선 방향이 제시되었다.

• 영어영문학
• /
• 제57권2호
• /
• pp.237-264
• /
• 2011

Based on its geophysical feature, the island has long been recognized as a separate and self-sustaining space independent of neighboring continent or other islands. Literary tradition has used the island as a metaphor for a utopian alternative to mundane human society with its various kinds of wrongdoings. Recent nature writings have taken up this island metaphor to emphasize the wholeness of the ecosystem in specifically designated natural community or landscapes such as national parks or wilderness preservation areas. Human-nature relations as border-divided area is also recognized as the island. Modern island biogeography, however, has disproved such a concept of islands as autonomous, revealing the contrasting fact that the richness of species on an undisturbed island is determined largely by species immigration from and emigration to a source of colonists. This scientific finding has posited the island as the interconnected nature, but the public and metaphoric use of it still resorts to the old concept of it as isolated and autonomous nature, because this image has been ingrained deeply in our consciousness and culture. Considering the negative consequences from the recognition of nature and nature-humans as isolated space, we need a new nature metaphor that embodies interconnectedness in nature and of human-nature relations. Such feature of interconnectedness is best embedded in the concept of ecotone. Some ecotones are created and maintained through human participation in nature, and this human induced nature of ecotone denotes the possibilities of a constructive relation between them. The substitution of the island with the ecotone as the concept of nature and the image of human-nature relations is expected to correct ecocritical practices of reading of nature writing, which has been predominantly interpreted within the orientation of nature itself and nature-human relations as an isolated and self-autonomous island. Adopting the ecotone in literary study enables ecocriticism to dig out cultural elements embedded in nature writing and reveal socio-political, ideological factors hidden behind the writers' portrayal of nature as islands.

• 품질경영학회지
• /
• 제50권3호
• /
• pp.441-457
• /
• 2022

Purpose: The purpose of this study is to analyze the effect of self-leadership on self-efficacy and customer orientation and to verify whether there is a mediating effect of self-efficy on the relationship between self-leadership and customer orientation. Methods: To verify these research problems, the subjects of this study were a total of 300 Korean cabin crew members working for domestic and foreign airlines who received distributed questionnaires and 247 copies wee analysed using the SPSS 20.0 program. Results: First, it can be seen that the self-leadership of airline cabin crew has a significant positive (+) effect on self-efficacy, indicating that self-leadership has a positive effect on the self-efficacy of the members of the organization. Second, it was found that self-efficacy had a positive (+) effect on the customer orientation of airline cabin crew, and it was analyzed that self-efficacy played a partial mediating role in the relationship between self-leadership and customer orientation. Third, it was found that self-leadership had a positive (+) effect on customer orientation, and it was proved that behavior-oriented strategy, constructive accident pattern, and natural compensation strategy, which are three sub-factors of self-leadership of cabin crew, have an influence on customer orientation. Conclusion: based on these findings, the theoretical and practical implications of this study and directions for future research were presented.