• The Transactions of The Korean Institute of Electrical Engineers
• /
• v.61 no.3
• /
• pp.451-458
• /
• 2012

This paper addresses the problem that policy iteration (PI) for continuous-time (CT) systems requires explorations of the state space which is known as persistency of excitation in adaptive control community, and as a result, proposes a PI scheme explorized by an additional probing signal to solve the addressed problem. The proposed PI method efficiently finds in online fashion the related CT linear quadratic (LQ) optimal control without knowing the system matrix A, and guarantees the stability and convergence to the LQ optimal control, which is proven in this paper in the presence of the probing signal. A design method for the probing signal is also presented to balance the exploration of the state space and the control performance. Finally, several simulation results are provided to verify the effectiveness of the proposed explorized PI method.

• Proceedings of the Korean Society for Applied Microbiology Conference
• /
• 2005.06a
• /
• pp.66-70
• /
• 2005

Microbiology research must be conducted in a fashion that assures the health and well being of the researcher and the safety of the community. This lecture raises awareness of biosafety issues and discusses how the interaction of the pathogen being studied, the person conducting the research, and the practices being used can be manipulated to assure safety. The characterization of pathogens into Risk Groups, how these relate to Biosafety Levels, and the personal practices and laboratory design criteria associated with each Biosafety Level are explained. The importance of preventing or containing aerosols, limiting opportunities for cross-contamination, and taking a flexible multi-component approach to biosafety are emphasized.

• International Journal of Human Ecology
• /
• v.10 no.2
• /
• pp.71-78
• /
• 2009

Efforts were made to improve the efficiency of college education through the use of information technology. This paper investigates student perceptions of a lecture club provided on a social networking website. For the empirical study, the instructor ran a lecture club for two consecutive semesters on Cyworld (www.cyworld.co.kr), a popular website among Korean youth. The research subjects were students enrolled in a Popular Culture & Fashion class. A questionnaire was distributed on the last day of the lectures. After excluding students with perfunctory responses and those who did not sign up for the community website, a total number of 297 questionnaires were used for analysis. Descriptive statistics, Pearson correlation analysis, one-way ANOVA analysis, Duncan test, and t-test were carried out, with the SPSS for Windows 12.0 being used for statistical analysis. The findings show that most students subscribed to the website and responded with a favorable attitude that the lecture club was helpful.

• International Journal of Advanced Culture Technology
• /
• v.12 no.3
• /
• pp.317-324
• /
• 2024

In terms of corporate sustainability management, the footwear industry is still at a very early stage compared to other sectors, and footwear, especially sneakers, is not as far along as apparel due to the nature of the product. As a result, there is a lack of research on sustainability in the sneaker industry in the academic community. Thus, this study analyzed the sustainability practices of three leading brands in the sneaker market, adidas, allbirds, and NIKE, in order to provide basic data for expanding sustainability in the sneaker industry. The study found that the characteristics of sustainable management in sneaker brands are economic efficiency, environmental circularity, social integration, and governance soundness. Sustainable management is increasingly recognized as an essential task in modern society, and as the sneaker market expands, the demand for CSM from relevant brands will grow accordingly. Therefore, the results of this study will help to set policy directions for sneaker brands pursuing sustainable management.

• The Korean Journal of Community Living Science
• /
• v.27 no.2
• /
• pp.245-263
• /
• 2016

This study was conducted to investigate the thermoregulatory behavior of young males in terms of self-identified thermal tolerance. We recruited 436 male students from Seoul ($24.0{\pm}4.6yr$ in age, $175.3{\pm}5.5cm$ in height, $70.1{\pm}10.6kg$ in body mass, and $23.0{\pm}2.7$ in BMI) in accordance with four types of self-identified thermal tolerance: 1) tolerable of both cold and heat, BCH (N=15); 2) heat tolerable only, HTO (N=118); 3) cold tolerable only, CTO (N=162); and 4) neither cold nor heat tolerable, NCH (N=141). The questionnaire consisted of 55 questions regarding preference to cold or heat environment, seasonal thermoregulatory behaviors including clothing habits, seasonal sleeping environments, health care/physical fitness, and anthropometric items. The results showed that: 1) BCH preferred less auxiliary heating devices, gloves/hats, or thermal underwear in winter and had very few experiences with cold/heat injuries or catching a cold, whereas NCH showed the opposite behavior and experiences as BCH; 2) thermoregulatory behaviors were not symmetrical between summer and winter. Most male students preferred cold beverage/foods to using cooling devices to lower body temperature in summer, whereas auxiliary heating devices were preferred to warm beverage/foods to maintain body temperature in winter; 3) thermoregulatory behaviors of NCH had more items in common with HTO than CTO, while the behaviors of BCH were more closely related to CTO than the behaviors of BCH were more closely related to CTO than HTO. Overall, we confirmed that thermoregulatory behaviors were apparently classified by self-identified thermal tolerance, and such behaviors could be adjusted by improving cold or heat tolerance.

• International Journal of Computer Science & Network Security
• /
• v.24 no.9
• /
• pp.111-118
• /
• 2024

The concept of social stratification and hierarchy among human dates back to the origin of human race. Presently, the growing reputation of social networks has given us with an opportunity to analyze these well-studied phenomena over different networks at different scales. Generally, a social network could be defined as a collection of actors and their interactions. In this work, we concern ourselves with a particular type of social networks, known as trust networks. In this type of networks, there is an explicit show of trust (positive interaction) or distrust (negative interaction) among the actors. In other words, an actor can designate others as friends or foes. Trust networks are typically modeled as signed networks. A signed network is a directed graph in which the edges carry an edge weight of +1 (indicating trust) or -1 (indicating distrust). Examples of signed networks include the Slashdot Zoo network, the Epinions network and the Wikipedia adminship election network. In a social network, actors tend to connect with each other on the basis of their perceived social hierarchy. The emergence of such a hierarchy within a social community shows the manner in which authority manifests in the community. In the case of signed networks, the concept of social hierarchy can be interpreted as the emergence of a tree-like structure comprising of actors in a top-down fashion in the order of their ranks, describing a specific parent-child relationship, viz. child trusts parent. However, owing to the presence of positive as well as negative interactions in signed networks, deriving such "trust hierarchies" is a non-trivial challenge. We argue that traditional notions (of unsigned networks) are insufficient to derive hierarchies that are latent within signed networks In order to build hierarchies in signed networks, we look at two interpretations of trust namely presence of trust (or "good") and lack of distrust (or "not bad"). In order to develop a hierarchy signifying both trust and distrust effectively, the above interpretations are combined together for calculating the overall trustworthiness (termed as deserve) of actors. The actors are then arranged in a hierarchical fashion based on these aggregate deserve values, according to the following hypothesis: actor v is assigned as a child of actor u if: (i) v trusts u, and (ii) u has a higher deserve value than v. We describe this hypothesis with additional qualifiers in this thesis.

• Journal of the Korean Society of Clothing and Textiles
• /
• v.32 no.11
• /
• pp.1726-1738
• /
• 2008

This study researches age of discretion and lifestyles for aged women consumers and examines their social and psychologically recognized age of discretion and the difference in shopping orientation on fashion. Also it is purposed to support implications for marketing strategy on fashion market for the aged. A survey was carried out regarding the consumers of the new elderly generation aged 55 and above. 561 respondents were surveyed, residing in Seoul and Metropolitan areas. Factor analysis, Cronbach's ${\alpha}$, K-average community and multivariate analysis, multi-recurrence and crossing analysis($X^2$ verified) were used for statistical analysis. In conclusion, first, people in their 70s to 80s perceive their age 20 to 30 years younger than their real age. Second, appearance-oriented and high technology-oriented were the most highlighted lifestyles as to the study of the vital statistical, related to the lifestyle in correspondence to the real-age and the cognitive age. Third, people who feel older than they actually are in terms of shopping orientation were less likely to shop depending on their mood. Throughout the results, there is no doubt that people in the elderly generation is a main target within marketing trends in the elderly generation industry. A research based on comparison between the male and the female consumers in the elderly generation is considered to be very meaningful.

• Journal of the Korean Society of Costume
• /
• v.15
• /
• pp.253-265
• /
• 1990

This article was written with two purposes in mind. The first purpose was to introduce clothing and textile community who may not be familiar with Multidimensional Scaling(MDS) with usefulness of the new technique in the area of fashion merchandising. The second purpose was to present the results of an empirical study on brand image utilizing MDS and its related technique as the main analysis tools. The main objective of the empirical study was to gain a better understanding of consumer's brand image by relating differences in perception and attributes of clothing in women's ready-to wear market. For this empirical study, the ten brands and the fifteen attributes of clothing were chosen. The questionnaire consisting of questions asking about the similarity and attributes of clothing between selected brands was administrated to 185 career women during summer in 1989. Data were analyzed cluster analysis, and KYST and PROFIT in MDS program. The results were as follows: 1. The similarities data for the ten selected brand by using KYST program of MDS drawed the perceptual map. The results of this perceptual map showed that the selected brand were grouped into three clusters. 2. In order to get a somewhat objective view of which attributes consumers are attributing to each brand, PROFIT program was used. As a result, it was revealed that assortment depth / width, price, youth-oriented style, possibility of various social activity were significant attributes in consumer's brand choice rather than physical attributes of clothing such as quality or durability. This may imply that consumer orientation in rapidly changing environments of women's apparel market was its basic idea, and the focus of all fashion merchandising activities was put on need's and the response of consumer group who are the object of the target. Implicating for future research as well as for strategy of brand positioning were also suggested.

• Journal of the Korean Society of Costume
• /
• v.62 no.6
• /
• pp.1-18
• /
• 2012

This study explores the clothing behavior of homosexual men for identity creation. Since homosexuality has been viewed in terms of immoral, medical or social problems, gay males have made efforts to construct presentational styles in order to hide or reveal their sexual identities. Kate Schofield and Ruth A. Schmidt found that there were three different layers of individual gay identity construction expressed in clothing: shared gay identity, tribal identity, and situational identity. Using their framework, 630 gay men's outfits found in the U.S drama 'Queer as folk' were analyzed, which dealt with the lives of a group of gay men living in Pittsburgh, Pennsylvania. Findings point that gay males use their clothing effectively to express their sexual identity. Firstly, they use certain fashion items as the signifier of homosexuality on a gay community level. They use their clothing to attract the sexual partners. On tribal identity level, diverse and fragmented styles could be shown besides the effeminate style. Homosexual men's clothing can be classified into the following four dominate styles: the drag look, the macho look, the androgynous look and conventional look. Findings also indicate that gay males make different clothing choices for different situations in order to blend into the heterosexual or homosexual society.

• Fashion & Textile Research Journal
• /
• v.11 no.1
• /
• pp.103-111
• /
• 2009

This study is to help make-up and coordination for image-making after analysis of facial color and shape of elderly women. The data was analyzed 55-75 years old 212 elderly women's face color and pictures by means of SPSS 12.0 statistics package. On the basis of the colorimetric data on face by Minolta CM2500D, this research considered the analysis of facial color, patternization of facial color and its analysis by age group; for the analysis of facial shape, this research patternized facial shape and analyzed its characteristic using both contour-based facial shape analysis and Kamata facial shape analysis. As for facial color, it was found that the lower age bracket has bright and reddish face, looking fine, while the higher age bracket has a conspicuously yellowish face, looking bad. The community of facial color is classified as 3 types and it was found out that the facial color of the subjects belonging to Type 3, whose L value is the largest, looked the brightest; the face of the subjects belonging to Type 2, whose a value is the largest, was much tinged with red, and the face of the subjects belonging to Type 1, whose b value is the largest were tinged with yellow. According to the analysis of facial shape, there appeared oval & long forms in the classification by contour, while there appeared a lot of downward-directed power and inner-directed power in the classification by Kamata, which is believed to reflect the phenomenon that their chin line becomes roundish and the facial length also tend to be longer due to aging.