• Fibers and Polymers
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• v.6 no.2
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• pp.131-138
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• 2005

A theoretical model is proposed in order to investigate rheological behavior of bubble suspension with large deformation. Theoretical constitutive equations for dilute bubble suspensions are derived by applying a deformation theory of ellipsoidal droplet [1] to a phenomenological suspension theory [2]. The rate of deformation tensor within the bubble and the time evolution of interface tensor are predicted by applying the proposed constitutive equations, which have two free fitting parameters. The transient and steady rheological properties of dilute bubble suspensions are studied for several capillary numbers (Ca) under simple shear flow and uniaxial elongational flow fields. The retraction force of the bubble caused by the interfacial tension increases as bubbles undergo deformation. The transient and steady relative viscosity decreases as Ca increases. The normal stress difference (NSD) under the simple shear has the largest value when Ca is around 1 and the ratio Of the first NSD to the second NSD has the value of 3/4 for large Ca but 2 for small Ca. In the uniaxial elongational flow, the elongational viscosity is three times as large as the shear viscosity like the Newtonian fluid.

• The Journal of Korean Academic Society of Nursing Education
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• v.7 no.2
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• pp.360-368
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• 2001

This research was an attempt to find out an entrance experience into major subject of student nurse. The purpose of this study was to understand an lived learning experience of student nurse. Method of the study was applied a phenomenological approach used by Colaizzi's analytic technique. Participants were 33 sophomore student nurse from TC University. The investigator conducted participated observations and in-depth unstructured interviews which were audio taped under the permission of student nurse, formulating meanings, themes and theme clusters. Results of the study were revealed 6 categories, 14 theme clusters, and 31 themes. Six categories include 'feeling anxious about clinical application', 'making superficial class', 'evaluation for ability of memory', 'deficit of academic evaluation criteria', 'insufficiency of textbook' and 'deficit for uniqueness of nursing science'. This findings confirm the fact that the student nurse's entrance experience was complicated and diversely influenced by their learning experiences. In conclusion, this study will prove helpful not only in understanding student nurse's entrance experience about their specialities but also in developing curriculum for nursing education.

• Korean Journal of Occupational Health Nursing
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• v.24 no.4
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• pp.313-322
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• 2015

Purpose: The purpose of this study was to identify novice nurses' experience of turnover. Methods: Data were collected from June to August, 2014 through in-depth interview and E-mail. Twelve novice nurses with turnover experiences were selected through snowball sampling method. All interviews were recorded with MP3 recorder and transcribed for analyzing by Van Kaam method of phenomenology. Results: The results were divided into 4 categories, 20 themes, and 119 formulated meaning related to turnover experience. These four categories were 'Excessively heavy working environment', 'Relationship problem', 'Physical/emotional withdrawal', and 'Realizing the absence of goal in job'. Conclusion: The result of this study will offer anticipatory information to understand of novice nurses' difficulties and to prevent their turnover. And these findings can be used for nursing administrators to design a turnover prevention program more effectively for nurses.

• Korean Journal of Occupational Health Nursing
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• v.25 no.3
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• pp.238-248
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• 2016

Purpose: The purpose of this empirical research was to describe the contents what had happened to nurses experiencing taeoom. Methods: This study explored the phenomenological ways to understand lived experiences in nurses' 'Taeoom' and investigated the 'Taeoom' through the deductive content analysis. For the this study, the data was collected through individual interviews with 11 nurses who worked over 12months in 1 hospital, lived in 5 areas, working 7 nursing unit of 10 hospitals. The interviews conducted by semi structured questions about participants' lived experiences in 'Taeoom'. Results: Inductive contents analysis identified 5 categories and 15 subcategories. Main themes in this study included a failed membership, difficult of practical field adaptation, feared with nursing unit life, self-centered peer relationships and rite of passage. Conclusion: This study results have been illuminated with edged sword which has a dark side and a light side to experienced in 'Taeoom'. Newly employed nurses have suffering from 'Taeoom' as well as retained nurse. Therefore, policy and practice programs for a diminution of suffering and management for nurses 'Taeoom' should be developed and implemented.

• The Korean Journal of Rehabilitation Nursing
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• v.19 no.2
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• pp.128-137
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• 2016

Purpose: This study was designed to describe the experiences of dementia prevention program for older adults in nursing homes. Methods: Four focus group interviews (FGI) after the program were conducted with 35 participants. All interviews were audio-taped and transcribed verbatim. The transcribed data were analyzed by Colaizzi's phenomenological method. Results: Four themes emerged as a result of analysis. Participants without dementia reported "I don't have dementia yet." This statement probably reflects ignoring potential dementia. Motivation for participating the dementia prevention program were to reduce boredom, to enjoy exercising and communicating with others, and to follow group activities. Participants reported the positive effects of the program; (a) benefits from the repeating learned activities; (b) improvements of memory and emotional stability. A few participants reported their inability to follow the program due to physical and environmental limits. However, other participants reported their efforts to overcome physical limits and perform the activities regardless their limits. People who performed the activities with physical limits reported that their self-satisfaction was increased. Conclusion: Results of this study showed that participants without dementia were able to actively participate in dementia prevention programs and showed memory, emotional and behavioral improvements. Therefore, these findings can be used for developing customized dementia prevention programs in nursing homes.

• Journal of the Korean Chemical Society
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• v.33 no.5
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• pp.459-467
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• 1989

When the sufactants are dissolved in water, they associate to form micelles and solubilize oil inside the micelle to form swollen micelles. Although spherical aggregates like micelles and swollen micelles occupy the same regions in the phase diagram of water-oil-surfactant systems, they are treated in different viewpoint for the formation of such aggregates. Hence a unified thermodynamic formalism for the formation of such structure is presented in this study. In all cases, the to ideal solution theory is applied for dilute system and the energy of formation is expressed as the sum of hydrophobic interaction energy and surface energy due to surfactant film. From the model, critical micelle concentration (CMC), average aggregation number, and solubilization ratio are predicted and compared with the known experimental observation.

• Journal of Korean Academy of Nursing
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• v.43 no.3
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• pp.431-441
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• 2013

Purpose: The study was done to explore meanings and essence of the experience in South Korea of men defectors from North Korea. Methods: Data were collected from March, 2011 to May, 2012, through in-depth interviews with ten men defectors. Data analysis was conducted using the process of hermeneutic phenomenological reflection. Results: Eight essential themes were extracted; 'buoyant expectation for a new life', 'feeling guilty about family left behind in North Korea', 'inability to become acclimatized due to communication difficulties', 'inability to socialize with South Koreans due to different lifestyles', 'finding strength through trustworthy acquaintances', 'continuing reconciliation with oneself while trying to assimilate into South Korean culture', 'self-realization of one's original self', and 'continuing to feel out the possibility of a future in South Korea'. Conclusion: The findings indicate that North Korean men who defect to South Korea shape their identity through three phases: forming self-image during escape from North Korea, trying to become accustomed to South Korean society, and finding their own identity by self-realization of their original self. Eventually, the whole process enables them to recover their identity, to feel a sense of belonging, and to discover possibilities for a better future.

• Journal of the Optical Society of Korea
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• v.16 no.2
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• pp.151-156
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• 2012

Reflective polarizers can be used as luminance enhancement films for LCD backlights via the polarization recycling process. The optical performances of a wire grid polarizer (WGP) as a reflective polarizer adopted in edge-lit backlights were investigated by luminance evaluation and a time-domain simulation technique. The results were compared to those of a commercial dielectric multilayer film. The luminance gain factor of WGP was smaller than that of the multilayer film by 18%. This was attributed to a much larger internal loss of WGP due to light absorption by metal wires. The internal losses of both reflective polarizers and the polarization conversion efficiency of the backlight were obtained numerically based on a phenomenological model. The optical performances of WGP were optimized by using a time-domain simulation technique. The luminance gain increased and was found to become comparable to, but slightly less than the case of the dielectric multilayer film with decreasing line width.

• East Asian mathematical journal
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• v.30 no.4
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• pp.405-438
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• 2014

This study analyzed and discussed instruction methods of polyhedrons in elementary mathematics textbook by using the didactic transposition theory. By further segmenting instruction methods, we analyzed the period and order of teaching of polyhedrons, its definitions and presentation methods, and how instruction methods has changed so far. In elementary mathematics textbooks from the 1st to the 2007 revised curriculum, we choose the part where polyhedrons are introduced as the search-target, and analyzed instruction methods in these textbooks by using phenomenological description. The instruction period and order of polyhedrons were systemized when the system of Euclid geometry was introduced, considering the psychological condition of students, and the instruction period and order had been refined according to the curriculum. And methods of definition took into consideration both the academic systems and psychological situations. Also, the subject of learning has changed from textbook and teachers to students. Polyhedrons were connected to real life and students could build up their knowledge by themselves. Constructions were aimed at the understanding of meaning of contents, rather than at itself. Through these analyses, we have some suggestions on the teaching of polyhedrons in the elementary mathematics.

• Asian Oncology Nursing
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• v.10 no.2
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• pp.199-209
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• 2010

Purpose: The purpose of this study was to understand the meaning of prayer in Christian patients with breast cancer. Methods: Data collection and analysis were conducted by the Colaizzi analysis of phenomenological method. Data were collected by in-depth interviewing the participants and by further follow-up observations. Sixteen patients participated in this study. Results: The significant statements (188), formulated meanings (42), themes (38), clusters of theme (10), and categories (5) were emerged. The 5 categories were as follows: communication with God, healing and peace, spiritual growth, distrust in prayer, and method of prayer. Conclusion: Further studies need to consider the period of faith, comparison between christian and other religions, and length of diagnosis. A better understanding of the meaning of prayer will lead to a more comprehensive view of the spiritual care for patients with breast cancer, and can lead to guidelines for assessment and intervention to reduce suffering from cancer.