• Bulletin of the Korean Mathematical Society
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• v.48 no.4
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• pp.791-812
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• 2011

This is a survey on American options. An American option allows its owner the privilege of early exercise, whereas a European option can be exercised only at expiration. Because of this early exercise privilege American option pricing involves an optimal stopping problem; the price of an American option is given as a free boundary value problem associated with a Black-Scholes type partial differential equation. Up until now there is no simple closed-form solution to the problem, but there have been a variety of approaches which contribute to the understanding of the properties of the price and the early exercise boundary. These approaches typically provide numerical or approximate analytic methods to find the price and the boundary. Topics included in this survey are early approaches(trees, finite difference schemes, and quasi-analytic methods), an analytic method of lines and randomization, a homotopy method, analytic approximation of early exercise boundaries, Monte Carlo methods, and relatively recent topics such as model uncertainty, backward stochastic differential equations, and real options. We also provide open problems whose answers are expected to contribute to American option pricing.

• Research in Community and Public Health Nursing
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• v.14 no.4
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• pp.667-675
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• 2003

Purpose: This study was purposed to provide basic data for developing future health promotion programs by comparing health-promoting behavior, life satisfaction and self-esteem between the Korean elderly and the American-Korean elderly. Methods: The subjects were volunteer participants of 120 elders in the Gyeongsan City in Korea and 120 elders in the state of Washington in the U.S. Tools used in this study were Health Promoting Lifestyle Profile (47 items), Life Satisfaction Scale (20 items) and Self-Esteem Scale (10 items). To analyze data, this study used frequency, percentage, chi-square test, t-test, Kendal tau test, Pearson's correlation coefficient with SPSS program. Results: 1) The average score of health-promoting behaviors was 3.21 in Koreans and 3.50 in American-Koreans, showing a significant difference between the two groups. 2) The sub-scales that got the highest score of health-promoting behaviors were self-actualization and nutrition(M=3.41) in Koreans and nutrition(M=3.61) in American-Koreans, and that with the lowest score was exercise in both groups(2.89 in Koreans and 3.02 in American-Koreans). 3) The average score for life satisfaction was 2.76 in Koreans and 3.06 in American-Koreans, showing a significant difference between the two groups. 4) The average score for self-esteem was 3.39 in Koreans and 3.09 in American-Koreans, showing a insignificant difference between the two groups. 5) Health-promoting behaviors were positively related to life satisfaction and self-esteem. Life satisfaction was positively related to self-esteem in both groups. Conclusions: According to the results of this study, the health-promoting behaviors of Korean and American-Korean elders strongly correlated with life satisfaction and self-esteem. Therefore, health promoting programs that enhance life satisfaction and self-esteem should be developed in order to promote the elderly's healthy lifestyle.

• Journal of Ginseng Research
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• v.22 no.2
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• pp.147-153
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• 1998

An investigation was conducted to ascertain the basic information on characteristics of growth and morphological characters among the Korean (Panax. ginseng), the American (Panax. quinquefolium) and the Bamboo (Panax. japonicus) ginseng. In aerial parts growth of the ginseng species by age, The Korean ginseng and American ginseng's stem and leaf growth was alike in 2-4 years old, but growth cycle changed in 6 years old. The Korean ginseng was more vigorous than the American ginseng. The Korean ginseng roots were highly observed in ratio of red skin roots among three species, whereas The American ginseng roots were highly infected by root rot. It seems to be variable depending on growing stage and species. The Korean ginseng flowered about the middle of May, the American ginseng early June, and the Bamboo ginseng was late of May, The berry color of the ginseng species was observed, The Korean and American ginseng's mature berry color was red, The Bamboo ginseng's berry was three type of color and shape. In root characteristics of the seedling, Korean (p. ginseng), American (p. quinquefolium) ginseng's root shape was similarity in type, the bamboo ginseng showed different type, which root length and root weight was smaller than those of ginseng. In morphological characters of Leaf surface, pollen, and stoma, the Korean ginseng and American ginseng had crystal rosette on epidermis cell, but the Bamboo ginseng didn't has crystal rosette. Pollen shape observed tricolpate pollen and size was media type among the ginseng species, and also guard cell was anomocytic type, which were observed by scanning electronic microscope.

• Journal of Families and Better Life
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• v.15 no.4
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• pp.125-136
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• 1997

The present study compares motives for caregiving, actual caregiving provision, care expectation from children in old age, and the connections between caregiving and inheritance distribution patterns as perceived by caregiving daughters/daughters-in-law and their care-receiving mothers/mothers-in-law between Korea and the United States. The results indicated that there was no difference in caregiving motives between Korean and American children while American mothers/mothers-in-law perceived significantly lower obligatory caregiving motives than their Korean counterparts. Also, both Korean children and their mothers/mothers-in-law reported higher level of care provision than their counterparts. The level of caregiving expectation from their children in old age among Korean elders was significantly different from those of American elders while no differences were found between Korean and American children. Finally, both Korean children and their mothers/mothers-in-law were more likely to endorse distributing larger shares of inheritance to the child who cared for his/her mothers/mothers-in-law than American counterparts. On the other hand, American subjects were more likely to accept the notion of equal distribution of inheritance. Overall, this cross-cultural study showed the cultural differences in caregiving and inheritance patterns between Korean and American subjects exhibiting salient difference among the older generation.

• Journal of Families and Better Life
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• v.28 no.6
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• pp.125-142
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• 2010

The main purpose of this study was to examine whether different cultures affect attachment style by comparing Korean and American adolescents, with a focus on parent attachment and peer attachment. Data were collected from middle and high school students(291 Korean adolescents, 158 American adolescents), and the participants were asked to report on the revised version of the Inventory of Parent and Peer Attachment(IPPA-R). The analysis showed significant differences on both parent and peer attachment between Korean and American adolescents: Korean adolescents had more negative relationships with their parents compared to American adolescents. In contrast, Korean adolescents had more positive relations(high trust and communication score, low alienation score) with their friends than American adolescents. More results on the relationships between attachment style and socio-environmental variables were presented, and each of these results could be interpreted by cultural difference. Based on these results, parent-child programs and peer programs that can enrich the relationships that a child has with his or her parents and friends were introduced for researchers, educators, teachers, and counselors. The implications and recommendations for future research were also presented.

• Cross-Cultural Studies
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• v.24
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• pp.46-61
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• 2011

This paper considers how Koreans found their positions in the complex, overlapping, disjunctive, and interconnected "Oriental" repertoires in the early Cold War years. When we use the term, Oriental, it should require careful translation from context to context because it may be subject to very different sets of contextual circumstances. Klein views Cold War Orientalism in the complex of various regions including East Asian and Southeast Asian countries; however, when Koreans are contextualized at the center of the discussion the Orientalism produces another discursive meaning. Even though many great researches have been done on Korean immigrations, Korean American literatures, and US-Korea economic, political, and foreign relations, not many discussions about Korean American popular cultures have been discussed in the basis of the Oriental discourse in the United States.For this argument, this paper investigates the performative trajectory of a girl group "Kim Sisters" who began to sing at the US military show stages in South Korea in 1952 during the Korean War. They moved to Las Vegas show stages in 1959 and later appeared in Ed Sullivan Show more than thirty times during the 1960s and 70s. Meanwhile, they not only returned to South Korea often times to perform at the stages for Korean audiences in South Korea but also played at the shows for Korean immigrants in the United States. Korean American immigration to the United States has followed a different route from the majority of Asian American population such as Chinese or Japanese Americans, which means that efforts to compare this particular group to the others may be unnecessary. Rather doing comparative studies, this paper, therefore, focuses on the formation of the intersecting and multiple identities of Korean female entertainers who were forced or forced themselves to be incorporated into the American popular "Oriental" imagination, which I would call "embedded" identities. This embeddedness has been continuously maintained in the configuration of Korean characters in the United States. This will help not only to observe the discursive aspect of Asian American identity politics but also to claim a space for comparatively invisible Korean characters in the United States which has been often times neglected and not brought into a major Asian American or Oriental historical discourse. This paper starts with American scenes at the beginning of the twentieth century to trace Americans Oriental imagination which was observable in the various American cultural landscape and popular music soundscape. It will help us more clearly understand the production and consumption of the Korean "Oriental" performances during the early Cold War period and especially the Korean performance in the American venue, silently overshadowed into the political, social, and cultural framework.

• Journal of the Korean Society of Costume
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• v.60 no.9
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• pp.106-119
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• 2010

The purpose of this study is to examine American students' perceptions of contemporary fashion design that incorporates Korean traditional costume. The findings, which are based on a survey of American students' aesthetic response to the fashion designs, are as follows. First, the impressions of American students about the fashion designs were affected by two major factors, Tradition and Trend. The Tradition factor was related to the impressions traditional, formal, elegant, classic, romantic, gorgeous, and natural, but was correlated negatively to the impressions dynamic, modern, and casual. The Trend factor was related to the impressions chic, trendy, and clear but not dandy. Designs with elongated shape had a positive score for the Tradition factor and designs with curvy line had a positive score for the Trend factor. Second, American students gave visual priority to the aspects of shape such as garment type and silhouette when they evaluated the designs. Color was less important than the aspect of shape in their fashion image perception. Therefore, they categorized the designs by similarity of garment types, and then sub-categorized them by color. The meaning of Korean traditional motifs or details was not significant to American students. Third, American students showed the tendency that the more they evaluated the designs to be gorgeous or trendy, the more they liked the designs. Furthermore, they liked the designs which have a positive score for the Trend factor.

• Korean Journal of Medicinal Crop Science
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• v.14 no.4
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• pp.229-233
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• 2006

Comparison of the grade of raw ginseng and that of red ginseng was investigated. The materials used in this study were Korean ginseng (Panax ginseng C. A. Meyer) and American ginseng(Panax quinquefolium L.) Coefficient of body term, length of main stem and weight of raw ginseng were used as the classifying criteria of the root size and grades. Korean ginseng distinguished the distribution of weight size from that of American ginseng. Korean ginseng distributed largely in middle and large root size, and American ginseng distributed largely in middle and small root size. American ginseng had shorter length of main root, bigger diameter of main root and more number of adventitious roots than Korean ginseng. The quality of Korean ginseng was better than that of American ginseng. In Korean ginseng, high quality of red ginseng above second grade (Jisam) was obtained, but low quality of red ginseng under third grade (Yangsam) in American ginseng. In Korean raw ginseng, the coefficients of body form of middle weight and large weight size were under 0.5, but those of American ginseng was over 0.5. So American ginseng were not adequate to produce good red ginseng. Those factors as length of main root and weight of main root were not significantly influenced on the qualify of red ginseng in both Korean ginseng and American ginseng. Coefficient of body form was leading factor affecting the quality of red ginseng. To improve the quality of red ginseng, coefficient of body form, weight of main root and length of main root were controlled adequately in both Korean ginseng and American ginseng.

• Korean Journal of Pharmacognosy
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• v.45 no.2
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• pp.107-112
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• 2014

The purpose of this study is to develop a new preparation process of American ginseng (Panax quinquefolium) extract featuring high concentration of ginsenoside $Rg_3$, $Rg_5$, and $Rk_1$, Red ginseng special components. Chemical transformation from ginseng saponin glycosides to prosapogenin was analyzed by the HPLC. Extracts of American ginseng were processed under several treatment conditions of microwave and vinegar (about 14% acidity). The results showed that the quantity of ginsenoside $Rg_3$ increased by over 0.9% at the 20 minutes of the pH 2~4 vinegar and microwave American ginseng ethanol extract compared with other process times. The result of MAG-20 indicates that the American ginseng microwave and vinegar-processed American ginseng extracts (about 14% acidity) treated for 20 minutes produced the highest amount of ginsenoside $Rg_3$ (0.969%), $Rg_5$ (1.071%), and $Rk_1$ (0.247%). Besides, MAG-15 indicates that the microwave - and vinegar-processed American ginseng extracts (about 14% acidity) treated for 15 minutes produced the highest amount of ginsenoside $Rg_3$ (0.772%), $Rg_5$ (1.330%), and $Rk_1$ (0.386%). This indicates that American ginseng treated with microwave and vinegar had the quantity of the ginsenoside $Rg_3$ over 32 times the amount of the ginsenoside $Rg_3$ (which was not found in raw and American ginsengs) in the average commercial Red ginseng.

• Journal of the Korean Society of Costume
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• v.15
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• pp.217-231
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• 1990

The purposes of this study were to research 1) the background of origination, 2) the process of development and 3) the influences to modern clothing culture of American sportswear. The most Influential sportswear designers in America from beginning period to present : such as Claire McCardell, Calvin Klein, Ralph Lauren and Donna Karan were selected to study their life and achievements in the world sportswear market. The Results were as follows : 1) World War I & II have caused the greatest changes to modern history America became the center of world economy, society and culture. Politically, they have influenced democracy world-wide and raised the social status of women. The free American women enjoyed sports, Jazz drinking and car-driving. The advanced technology have accelerated mechanization and mass-production to the fashion industrv. 2) The above historical backgrounds have caused to change women's clothing to casual, practical and simple form. Dorothy Shaver at Lord & Taylor began promoting American designers who created the original American spirit. Claire McCardell created the seperated American sportswear to become world-wide fashion. Calvin Klein and Ralph Lauren, the sportswear designers who have the unique American feeling have come to have riches and fames equal to the top designers in Paris. 3) The American sportswear and fashion industry influenced Paris Mode, the traditional Haute Couture to open Pret-a-porter-a-porter. The concept of seperated coordination in American sportswear have promoted the advanced marketing techniques and merchandising systems to modern ready-to-wear industry. Fashion in 1980s have increased the mutual interdepedence between the American sportswear industry and the creative Paris Mode. And then, the fashion world in 1990s and 21C will be changed and developed on the basis of American sportswear mechanism.