• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.1373-1380
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• 2011

Seoul Metro has been continuously growing after its foundation on August 15, 1974 and is currently acting the leading role in the city transportation which is now used by 4,130 thousand people (as of early 2011) on a daily average. The number of the electric rail cars also increased significantly from 60 cars at the time of foundation to 1,954. And the types of the cars also started and operated with the rheostatic control cars in the 70s to the chopper control cars in the 80s and VVVF control cars in the 90s. But the control devices of the driver's cabs haven't been accustomed to the drivers because of it's diversity. Therefore, This study carried out the survey for the preferences of control devices from the incumbent drivers at Seoul Metro. And we analyzed it and suggest a method for standardization of it's locating and naming the major control devices in the driver's cab as the consideration of their preference for it's efficiency, safety, and convenience.

• 대한기계학회논문집A
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• 제32권8호
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• pp.678-684
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• 2008

A general treatment is to restore abfraction lesions with dental filler materials to reduce stress concentration. A material should be selected from various dental products based on long term experiences of dentist or personal preference concerning filler methods. A quantitative criterion is necessary to make an evaluation of the results as dentists decide treatment methods and dental materials relying on their clinical experiences. The purpose of this study is to find an optimal restoration method and material for noncarious cervical lesions using the finite element method. An objective function was defined to minimize the sum of tension or compression stress. Trial-and-error and approximation were used to find an optimal restoration method. An optimal solution was to fill TetricFlow inside the lesion and Z100 in the remaining region. The most desirable thickness ratio of the two filler materials was 0.125 with trial-and-error and it was similar to the results of approximation, 0.121 and 0.132.

• Preventive Nutrition and Food Science
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• 제16권4호
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• pp.390-393
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• 2011

The effects of differing baking ingredient formulations on physicochemical qualities and consumer preferences were investigated using sponge cakes incorporated with tomato powder, a healthy and beneficial food ingredient, as a model system. Tomato powder was incorporated into cake batter at four different amounts (0%, 10%, 20%, and 30%, w/w) by replacing equivalent amount of wheat flour. After appropriate mixing, sponge cakes were baked and cake quality attributes were evaluated after cooling. Specific volume decreased with an increase in the tomato powder substitution, although not significantly (p>0.05). On the other hand, baking loss increased from 10.3 (control) to 13.4 (30% sample) as the tomato powder level increased in the formulation. Lightness ($L^*$) decreased significantly from 79.5 to 74.1 whereas the firmness significantly increased with the higher incorporation of tomato powder (p<0.05). The consumer preferences on color, taste, and flavor, but not softness, were significantly affected by the amount of tomato powder incorporated in the sample (p<0.05). With respect to overall acceptability, the 20% sample received the highest mean score of 5.1, although this was not significantly different from the 10% sample or control (p>0.05). The incorporation of tomato powder, up to 20%, in the formulation of sponge cakes did not significantly influence the consumers' acceptability in all attributes tested.

• 한국정밀공학회지
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• 제24권7호
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• pp.112-119
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• 2007

Cavities of Class V are caused by heavy occlusal loads due to bruxism and clenching habit. It is general to restore abfraction lesions with dental filler materials to reduce stress concentration. A material should be selected from various dental products based on long term clinical experiences or personal preference concerning filler methods. A quantitative criterion is necessary to make an evaluation of the results as dentists decide treatment methods and dental materials relying on their clinical experiences. The purpose of this study is to find an optimal restoration method and material for noncarious cervical lesions using the finite element method. An objective function was defined to minimize the sum of tensile and compressive stresses. Several models with different combinations of resins were suggested and compared in terms of the values of objective function. An optimal solution was to fill TetricFlow inside the lesion and Z100 in the remaining region with a thickness ratio of 0.125.

• International Journal of Human Ecology
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• 제15권2호
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• pp.69-80
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• 2014

Guided by the exchange model, altruistic model, intergenerational solidarity theory, and cultural contexts, this study explored the determinants of financial intergenerational transfers between older parents and adult children in South Korea. We examined 18,820 parent-child dyads by using random-effects models on the first wave of the Korean Longitudinal Study of Ageing (KLoSA) data. Findings showed that downward financial intergenerational transfers were consistent with the self-interest exchange model but upward transfers did not support microeconomic theories. Family solidarity theory was generally supported by downward transfers but geographical proximity was not positively associated with upward transfers. Lastly, cultural contextual variables such as marital status, birth order, and sex of a child were found to be significant. Parents tended to both provide and receive more financial support from unmarried children than from married children. Within the same marital status, the hierarchy existed in order of the first-born son, the second or later sons, and daughters when it came to downward financial transfers. Regarding upward financial transfers, the preference in order was more complicated. The findings of this study help in understanding the intergenerational financial transfers in the Korean context.

• 농촌계획
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• 제11권3호
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• pp.43-52
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• 2005

Twelve selected rural villages were investigated to identify typical Korean rural landscapes. Among many photos taken in those villages, which are believed to represent rural amenities, one hundred photos were selected and again sixty of them were chosen through a questionnaire survey of landscape students. Two hundred domestic subjects and one hundred and one overseas visitors were surveyed to find their evaluations of 'rurality' of the Korean rural landscapes and their 'preferences' of those landscapes. Photo numbers 16, 40, 48, 37, 49, 11, 8, 56, 15 were evaluated most 'rural' and/or 'preferable' by domestic subjects. As the overseas visitors 'mrurality', they were asked to evaluate their 'preferences' only. Photo numbers 60, 7, 38, 28, 59, 15 were the most preferred Korean rural landscapes by them. In summary, Korean public generally preferred rural landscapes with natural beauty and, on the other hand, overseas visitors most preferred historic rural landscapes. Both group preferred least rural landscapes with man made structures.

• International Journal of Internet, Broadcasting and Communication
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• 제13권1호
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• pp.161-167
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• 2021

This paper proposes a new personalized HRTF estimation method which is based on a deep neural network (DNN) model and improved elevation reproduction using a notch filter. In the previous study, a DNN model was proposed that estimates the magnitude of HRTF by using anthropometric measurements [1]. However, since this method uses zero-phase without estimating the phase, it causes the internalization (i.e., the inside-the-head localization) of sound when listening the spatial sound. We devise a method to estimate both the magnitude and phase of HRTF based on the DNN model. Personalized HRIR was estimated using the anthropometric measurements including detailed data of the head, torso, shoulders and ears as inputs for the DNN model. After that, the estimated HRIR was filtered with an appropriate notch filter to improve elevation reproduction. In order to evaluate the performance, both of the objective and subjective evaluations are conducted. For the objective evaluation, the root mean square error (RMSE) and the log spectral distance (LSD) between the reference HRTF and the estimated HRTF are measured. For subjective evaluation, the MUSHRA test and preference test are conducted. As a result, the proposed method can make listeners experience more immersive audio than the previous methods.

• 대한가정학회지
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• 제39권10호
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• pp.19-28
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• 2001

China adopted a free market economy system and is about to enter into the WTO(World Trade Organization). It has now emerged as one of the most promising markets in the world for the near future. The purpose of this study was to investigate in Chinese and Korea women's street fashion and to suggest basic information for high quality clothing merchandising for China. The subjects in this study were 800 photos it was taken at the fashion street and college in Beijing(400) and Seoul(400). The survey was taken from December, 1999. SAS(Statistical Analysis System) is used for frequency, percentage, average, standard deviation, $X^2$-test. The results of this study are as follows. Examination on the Korean and Chinese street fashion showed that Korean and Chinese have different preference for silhouette, length, and color. China has different sensibility of the items of clothing. The Chinese students prefer classical and individual Chinese street clothing. Korean student has shown very fashionable street clothing all items. It is needed to different merchandising project for clothing in China.

• Clinical and Experimental Reproductive Medicine
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• 제7권1_2호
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• pp.35-38
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• 1980

Korean family planning program has been adopted as a part of the Economic Development Plan with strong national government backup. After initiation of family planning program, the increase rate of total population declined from 2.6 percent during 1955-1960, to 2.1 percent in 1960-1975, and 1.6 percent in 1979. Of course, we do not ascribe this population increase rate decline to the national family planning program alone. Other contributing factors have been changes such as growing numbers of induced absortions, a rising marriage age and economic development. Currently, 2,600 family planning workers are assigned in all myun of the country. 21 percent of the works are registered nurse, 9 percent are midwife and aid nurses occupy 70 percent (Table 1). Authorized clinics are 2,329 which composed 1,765 IUD clinics, 1,070 vasectomy clinics and 1,150 Fimale sterilization clinics (Table 2). Cumulative contraceptive services provided by government program, 1962-1974 is illustrated in Table 3. After government program in family planning has been initiated (1962-1978), estimated number of births averted by each methods was measured (Table 4). From 1962 to 1978, tendency of contraceptive acceptors is illustrated in Table 5 showed that IUD, oral pill and condom program is decreasing and in other hand, sterilization program is increasing very much. Attitude change toward family size (1965-1978), contraceptive practice and son preference are showed in Table 7, 8, respectively. Auther concluded that future program in family planning should target to the point, that smaller family size norm for maternal health should be emphasized rather than smaller size family for national development.

• 헤리티지:역사와 과학
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• 제35권
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• pp.186-219
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• 2002

It is fortunate to glance at the old fabric style through the fabrics found in the Buddhist statues. There fore these fabrics deserve more attention and significance among the various remains found in the Buddhist Statues and should be taken carc of as the cultural inheritance. Concepts in the traditional fabrics could be viewed in three different aspects, In the first, the five primary elemental conception(五方思想) deeply rooted as the part of life style in old time appeared in five dircctional colors of the costumes whicb in turn connected to the traditional thought of order and harmony with nature. The second is the formal aspect. As can be seen in the fabrics found in the Buddhist statue, religious symbol was shaped into spiritual representation. The third is the aspect of the textile motifs, where wealth and preference for son were symbolized and even a utopia they dreamed for was appeared in the motif. Considering these conceptual aspects, the traditional textiles could be understood in line with the other cultural activity and should be taken more attention since the idea embeddcd in the textiles or colthes reveal the essential thoughts in old time.