• Proceedings of the Membrane Society of Korea Conference
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• 1999.07a
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• pp.39-42
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• 1999

Perfluoropolymers represent the ultimate resistance to hostile chemical environments and high service temperature, attributed to the presence of fluorine in the polymer backbone, i.e. to the high bond energy of C-F and C-C bonds of fluorocarbons. Copolymers of Tetrafluoroethylene (TEE) and 2, 2, 4Trifluoro-5Trifluorometoxy- 1, 3Dioxole (TTD), commercially known as HYFLON AD, are amorphous perfluoropolymers with glass transition temperature (Tg)higher than room temperature, showing a thermal decomposition temperature exceeding 40$0^{\circ}C$. These polymer systems are highly soluble in fluorinated solvents, with low solution viscosities. This property allows the preparation of self-supported and composite membranes with desired membrane thickness. Symmetric and asymmetric perfluoropolymer membranes, made with HYFLON AD, have been prepared and evaluated. Porous and not porous symmetric membranes have been obtained by solvent evaporation with various processing conditions. Asymmetric membranes have been prepared by th wet phase inversion method. Measure of contact angle to distilled water have been carried out. Figure 1 compares experimental results with those of other commercial membranes. Contact angles of about 120$^{\circ}$for our amorphous perfluoropolymer membranes demonstrate that they posses a high hydrophobic character. Measure of contact angles to hexandecane have been also carried out to evaluate the organophobic character. Rsults are reported in Figure 2. The observed strong organophobicity leads to excellent fouling resistance and inertness. Porous membranes with pore size between 30 and 80 nanometers have shown no permeation to water at pressures as high as 10 bars. However high permeation to gases, such as O2, N2 and CO2, and no selectivities were observed. Considering the porous structure of the membrane, this behavior was expected. In consideration of the above properties, possible useful uses in th field of gas- liquid separations are envisaged for these membranes. A particularly promising application is in the field of membrane contactors, equipments in which membranes are used to improve mass transfer coefficients in respect to traditional extraction and absorption processes. Gas permeation properties have been evaluated for asymmetric membranes and composite symmetric ones. Experimental permselectivity values, obtained at different pressure differences, to various single gases are reported in Tab. 1, 2 and 3. Experimental data have been compared with literature data obtained with membranes made with different amorphous perfluoropolymer systems, such as copolymers of Perfluoro2, 2dimethyl dioxole (PDD) and Tetrafluorethylene, commercialized by the Du Pont Company with the trade name of Teflon AF. An interesting linear relationship between permeability and the glass transition temperature of the polymer constituting the membrane has been observed. Results are descussed in terms of polymer chain structure, which affects the presence of voids at molecular scale and their size distribution. Molecular Dyanmics studies are in progress in order to support the understanding of these results. A modified Theodoru- Suter method provided by the Amorphous Cell module of InsightII/Discover was used to determine the chain packing. A completely amorphous polymer box of about 3.5 nm was considered. Last but not least the use of amorphous perfluoropolymer membranes appears to be ideal when separation processes have to be performed in hostile environments, i.e. high temperatures and aggressive non-aqueous media, such as chemicals and solvents. In these cases Hyflon AD membranes can exploit the outstanding resistance of perfluoropolymers.

• Journal of Korean Classical Literature and Education
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• no.32
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• pp.327-355
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• 2016

This study aims to identify petit bourgeois desires through the characters in "Oksosun Stories" from Cheonyerok, an eighteenth-century Yadam anthology. The desires and motivations of the characters are quite secular and egocentric. Because of this, their shared characteristics are similar to those of the petit bourgeois, as neutral existence begins to emerge during the transition from feudal to modern society. The concept of petit bourgeois generally means the public and the working class of modern society. The main character's behavior in the story differs little from general petit bourgeois attitudes. An important belief in petit bourgeois is not the ruling ideology in society but the achievement and stability of realistic and ordinary desires to fulfill their lives' satisfaction. Also selfish or antisocial attitudes and boundary characteristics appear in the process, depending on whether subject having any desire. However, the character's actions are limited in the governance system of a huge reality. And It is characterized by end goal being to meet their upward mobility and stability. This corresponds with Seang's (書生) actions of turning his back on his family and country as well as promising Jaran his love; and, he redeems himself with his family and society by acquiring stability after he passed the state examination. Furthermore, the contemporary significance of this work demonstrates Seang (書生) discovering his desires for human love; therefore, in order to affirm and gratify this desire, he endures the societal state of semi-feudalism against filial duty (不孝), disloyalty (不忠), and non-chastity (不烈), and he acts independently. In addition, on the strength of his pursuit of his desires, Oksosun frees herself from the caste restraint called gisaeng (妓生) and affirms her desire to become a subject of love, but she then deviates from the social system. Moreover, the limitations and achievements of the petit bourgeois are indicated in the actions of recognizing the social threshold of their past in the process, making independent efforts using their capabilities, fulfilling success in the state examination with their intellectual capacity, and re-entering society. From the late Chosun Dynasty to modern times, there is not only the type of contemporary people who hunger for fulfillment of their personal desire and live in free will, but there is also the feudal type that is still lacking in the understanding of independent life. This is not as different as in these present times. This literature asserts the meaning of awakening one's self-existence and assigning great value to the fulfillment of self-desires against the odds that are created by socio-political, cultural, economic norms of the era. "Oksosun Story" affirms the small efforts and successes of private individuals in reality. It also validates the search for life happiness through positivity. In this sense, even the contemporary reader would derive valid meaningfulness from this literature.

• Korean Journal of Childcare and Education
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• v.10 no.3
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• pp.85-102
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• 2014

The purpose of this study is to investigate the effect of toddler's emotionality and mother's reaction to their child's negative emotions of social-emotional behaviors of toddlers. The subjects were 141 mothers and toddlers ranging in age from 18 to 36 months. Instruments used in this study were: 1) Early Childhood Behavior Questionnaire(ECBQ)(Rothbart, 1994), 2) Coping with Toddlers' Negative Emotions Scale(CTNES)(Eisenberg et al., 1996), and 3)Brief Infant Toddler Social and Emotional Assesment(BITSEA)(Carter et al., 2006). Data were analyzed using Pearson's correlation and hierarchical multiple regression analysis. The results of this study show that toddler's emotionality and the mother's negative reaction to their child's negative emotions were related to the social-emotional behaviors of toddler. Also, mother's reaction to their child's negative emotions have mediation effects between toddler's emotionality and social-emotional behaviors. Specifically, toddler's emotionality has a partial mediating effect on social-emotional behaviors through mother's supportive reaction to their child's negative emotions. Additionally it was also determined that the toddler's emotionality has a complete mediating effect on the relationship between mother's unsupportive reaction to their child's negative emotions and the social-emotional behaviors of toddler. Theses results support the notion that mother's character as well as child's personality at birth are critical predictors which could impact social-emotional behaviors of toddler.

• Journal of Korean Medical classics
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• v.26 no.3
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• pp.75-84
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• 2013

Objective : This study considered the annual cyclical rituals related to medicine in an effort to look into the general medical conditions in the late Joseon Dynasty. Method : This study selected Uibanghappyeon 'Wolhaeng' as its research material in that it reflects the medical conditions at that time as a writing in the late Joseon Dynasty, and it's a record about annual cyclical rituals included in a medical book. The annual cyclical rituals are possible to analyze from various angles, but this study perceives the fundamental elements forming the annual rituals as (1) the time when a ritual was held (2) purpose, (3) method, and analyzed the calendaric rituals by dividing them according to the three elements. Result : There appear 97 sorts of annual rituals period in all according to their contents in Uibanghappyeon 'Wolhaeng.' (1) the case of directly suggesting a specific day like May 5 was found to be the most with 46 cases on the basis of the character of the implemented time, followed by the part (16 cases) with the sexagenary cycle like the Day of the Ox. (2) From the aspect of the purpose, the case of aiming at preventing diseases was found to be the most with 24 cases, and the case of expressing 'having to do like that' without any clear reason, or 'that would be better' was found to be the third-most 19 cases. In a broad sense, should these two be perceived as disease prevention, these statistics accounted for a half of the whole with 43 cases. Meanwhile, the style of rituals whose purpose was disease treatment(22 times) was to make a medicine on a specific day. Among the 22 sorts related to disease treatment, 16 sorts were the custom of making medicine on a designated day. (3) When classified from the aspect of methods, they can be divided into pharmaceutical preparations(23 cases), specific behavior(20cases), taboo(19 cases), taking medicine(15 cases), fasting(11 cases) and external medical treatment(9 cases), etc. This shows a comparatively even distribution rather than the case of dividing the annual rituals into a period or purpose. Conclusion : Medicine is the knowledge for preventing and treating diseases. However, the medical science and medical treatment of a traditional society show not a little difference from what we feel. The research on the annual cyclical rituals related to medicine is expected to be helpful to our perception of such a difference.

• Wind and Structures
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• v.10 no.4
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• pp.367-382
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• 2007

A nonlinear numerical method was developed to assess the stability of suspension bridge catwalks under a wind load. A section model wind tunnel test was used to obtain a catwalk's aerostatic coefficients, from which the displacement-dependent wind loads were subsequently derived. The stability of a suspension bridge catwalk was analyzed on the basis of the geometric nonlinear behavior of the structure. In addition, a full model test was conducted on the catwalk, which spanned 960 m. A comparison of the displacement values between the test and the numerical simulation shows that a numerical method based on a section model test can be used to effectively and accurately evaluate the stability of a catwalk. A case study features the stability of the catwalk of the Runyang Yangtze suspension bridge, the main span of which is 1490 m. Wind can generally attack the structure from any direction. Whenever the wind comes at a yaw angle, there are six wind load components that act on the catwalk. If the yaw angle is equal to zero, the wind is normal to the catwalk (called normal wind) and the six load components are reduced to three components. Three aerostatic coefficients of the catwalk can be obtained through a section model test with traditional test equipment. However, six aerostatic coefficients of the catwalk must be acquired with the aid of special section model test equipment. A nonlinear numerical method was used study the stability of a catwalk under a yaw wind, while taking into account the six components of the displacement-dependent wind load and the geometric nonlinearity of the catwalk. The results show that when wind attacks with a slight yaw angle, the critical velocity that induces static instability of the catwalk may be lower than the critical velocity of normal wind. However, as the yaw angle of the wind becomes larger, the critical velocity increases. In the atmospheric boundary layer, the wind is turbulent and the velocity history is a random time history. The effects of turbulent wind on the stability of a catwalk are also assessed. The wind velocity fields are regarded as stationary Gaussian stochastic processes, which can be simulated by a spectral representation method. A nonlinear finite-element model set forepart and the Newmark integration method was used to calculate the wind-induced buffeting responses. The results confirm that the turbulent character of wind has little influence on the stability of the catwalk.

• Science of Emotion and Sensibility
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• v.16 no.3
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• pp.351-362
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• 2013

This study aims to investigate the characteristics of Chinese consumers, who are growing up as the global biggest consumption market, according to G sensibility types, and to provide the data base for China market by analyzing the consuming pattern per sensibility and the preferred color. For the investigation, the survey on G sensibility and consuming pattern was conducted for consumers in four cities of China. As a result of classification of G sensibility types, it was found that Chinese consumers tended to behave in accordance with their values and identities and the most general type in them was G1 pursuing the reasonable and logical consumption, unlike Korean consumers who tended to be shown as G3 for the most general type according to the preceding study. As to characteristic of consumption, Chinese consumers preferred to purchase clothes from the department store, and in case of G2 type, the characteristics was corresponded with Actionist's character which shows the wide range of behavior and high-consumption, by preferring the road-shop next to the department store. Chinese consumers tended to purchase the clothes on the basis of their preferred colors, and especially it was shown that achromatic color was very commonly preferred. Also the black color was on the highest preference, and white, dark gray and light gray were followed. Meanwhile, in chromatic color, it was found that brown, orange, red and blue were preferred in order, and in case of G4, it was found that they preferred more various colors compared to the other types. This result could be used as the data base for the marketing strategy of fashion design industry and the related companies, as well as the new communication method for the consumers.

• Korean Institute of Interior Design Journal
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• v.24 no.1
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• pp.178-188
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• 2015

This study has the main objective of being of help as a reference data for the application of the finishing materials when designing the interior of the chapel of the church space through analysis of the finishing materials against the chapels of church space which has complex function. As precedent studies for this, the composition of the function and concept of the church space was surveyed and the complex function of the church space was surveyed. The theoretical surveyed was performed according to the casual composition, behavior of the community and role and location of the duties of the church members. The case objects were 10 chapels constructed by 5 professional interior design companies. The content of the analysis was the finishing materials in the chapels and their application characteristics. The detailed considerations to be referred to when designing the interior of the chapels of church space in the future were proposed. The analysis result of the application of the finishing materials according to the locational function of the chapels of church space can be explained as follows. First, the platform area was the characteristic of applying finishing materials which induce visual immersion. As for the floor materials in the platform, in order to minimize the floor sound and vibration phenomenon occurring during movements, noise insulation and dust protection rubber sheet was place and on top of it the floor or the carpet was placed. Second, the Choir area had the difficult problem of having to consider the appropriate sound absorption occurring due to the proliferation of sound and performance of classical instruments at the same time. However, in the case, this problem was solved through the sculptures of convex shape. Third, since the scheelite is a space where many people move around, the finishing material which absorbs sound was mainly used. Fourth, the entrance area was composed of thick wall materials compared to other walls, and the sound absorption character was most significantly considered when applying the finishing material. Fifth, the broadcasting room was composed either in independent type or an open type and performed its function and the main finishing materials was transparent glass which was highest use frequency.

• Cartoon and Animation Studies
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• s.27
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• pp.221-247
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• 2012

In this study, we examined the sense of tradition and cultural traditions which make up Japanese ubiquitous society. These include the traditional elements which affect the lives of contemporary Japanese people. In this research we looked for various media (mobile phones, blog, characters goods, cinema) which appeared in the traditional elements. The results of the study are as follows: The traditional elements which affect contemporary Japanese lives include modern devices such as use of anonymous "blogging", mobile phones "youth culture"(especially by males), and "cute" character vocabulary use (especially by females), while traditional values(yakuza, sumo, human relationships) are represented in Japanese cinema. Through this study, we have found the points where traditional Japanese culture and cultural sense have been reinterpreted and affected both directly and indirectly through modern media. This study contributes to cultural research by delineating the various stimuli to consider for successful content service adoption in a global setting, which can account for differential impacts across regions. The results not only help develop a sophisticated understanding of customer behavior theories for researchers, but they also offer useful knowledge to those involved in promoting culture content to potential purchasers.

• Journal of Sasang Constitutional Medicine
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• v.12 no.1
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• pp.63-83
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• 2000

The common concerns of leadership approaches were focused on finding leadership factors or necessity of leadership change to proper leadership styles adapt to contingent change through observing various leaders' behaviors for improving organizational effectiveness. Basically, they assumed that the human could be adapt to any conditions regardless of his inherent characters though it is perceived generally that human beings have different attitudes and behaviors toward the same fact, condition, situation, etc. In other words, inherent factors that cause individual differences have been neglected but concerned only about postnatal environments which influence human characters in previous leadership studies. A number of studies concerning inherent human characters have been worked in Asia for the past thousands years, which enable answering to the questions; why the human beings have different characters and personalities, and how to manage them in the given life conditions. In this research, four type human theory(called Sasang Theory) which has already been widely used in medical field in Korea will be introduced and applied to leadership theory to indicate inherent causal factors of the human character that are expected to influence leadership styles. In process, two different methods, one is for leadership theory and the other is for Sasang theory, have to be considered to match the different ideas. The theory is so predictable that the result implies possibilities of further future researches in the organizational fields by presupposing human behavior.

• Korean Journal of Materials Research
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• v.10 no.1
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• pp.62-68
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• 2000

Ultra thin TiN films (50∼700nm thickness) were deposited on AISI 304 stainless steel substrates using a reactive DC magnetron sputtering deposition process to investigate their wear and friction properties. Dry sliding wear tests of the films were carried out against hardened steel and alumina counterparts using a pin-on-disk type wear tester at room temperature. Variation of friction coefficient was measured as a function of film thickness, load, sliding speed and roughness of the substrate. Worn surfaces of the film were examined by a scanning electron microscope. Wear resistance of the TiN film increased with the increase of the film thickness. The TiN film showed relatively high wear resistance in spite of its ultra thin thickness when it is mated by the steel counterpart, while it showed poor wear resistance with the alumina counterpart. The good wear resistance with the steel counterpart was explained by the formation of oxide layers on the film surface and sound interface character between the ultra thin film and the substrate.