• Journal of Advanced Navigation Technology
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• v.19 no.6
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• pp.558-563
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• 2015

There have recently been various services that use indoor location estimation technologies. Representative methods of location estimation include fingerprinting and triangulation, but they lack accuracy. Various kinds of research which apply existing location estimation methods like AOA, TOA, and TDOA are being done to solve this problem. In this paper, we study the location estimation algorithm based on AOA using a RSSI difference in indoor environments. We assume that there is a single AP with four antennas, and estimate the angle of arrival based on the RSSI value to apply the AOA algorithm. To compensate for RSSI, we use a recursive averaging filter, and use the corrected RSSI and the Pythagorean theorem to estimate the angle of arrival. The results of the experiment, show an error of 18% because of the radiation pattern of the four non-directional antennas arranged at narrow intervals.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.7 no.2
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• pp.284-292
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• 2003

In this paper, we carried out the numerical examination of the initial value setting-up method to extend the range of optimal step parameter in a adaptive system which is controlled by LMS algorithm. For initial value setting-up methods, the general method which select the initial value randomly and the other method which applies the approximate value obtained from the direct method to initial value, were used. And then, we compared to the ranges of step parameter setting, the convergence speeds of mean-square-error, and the stabilities during the convergence process when the initial values were applied to the optimal directivity synthesis problem. According to the numerical simulation results, the initial value setting-up method by means of the direct method provides wider range for the step parameter, more efficient capability for convergence and stability, and more error correction ability than the general method.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.1
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• pp.346-353
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• 2015

This study examined the role of the demographic characteristics at relationship between customer orientation and flight attendants' burnout in airlines. As a result, the following findings were obtained. First, more than 30 years of age had a negative impact on depersonalization. Under age 30 and emotional exhaustion negatively affected customer orientation. Second, regardless of the rank. depersonalization negatively affected the customer orientation, and emotional exhaustion of the crew had a negative impact on the customer orientation. Third, more than 8 years experience of depersonalization had a negative influence on the customer orientation. Less than eight years experience of depersonalization and emotional exhaustion had a negative influence on the customer orientation.

• The Journal of the Korea Contents Association
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• v.10 no.9
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• pp.212-219
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• 2010

Modern museum, along with the basic roles of a museum that display to the public through the exhibition of physical evidences that collected, preserved and researched about human environment, it is changing in a way to appropriately fulfill the desire of new culture of the public and to fit the paradigm of the digital era. Diversification of expression method using multimedia played a big role in effective meaning delivery and technology development made possible for interaction-able of digital media build up and application to made possible of interactive communication for visitors. If the main purpose of the past museum exhibition was the delivery of information and knowledge, modern museum's exhibit has been identified as the purpose being diversified through the use of digital media. Exhibition planner, as for museum exhibition that used many characteristics of the digital media as mentioned above, should plan so that past unfamiliar relic can communicate with us living in the modern society. But obsessive usage of the digital media should not shade the interest of the visitors towards the relic in overall exhibition; and what is most important is that other than the exhibition and exhibit, enforcement of translation through systematic coherent approach and its appropriate digital technology and creative application and harmony are more important.

• Fashion & Textile Research Journal
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• v.15 no.6
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• pp.912-922
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• 2013

This study examined the differences in appearance orientation and appearance management behavior in groups (classified by the body mass index) as well as explored the differences in each of demographic variables. Data were collected from 513 respondents from the city of Daegu as well as Gyeongbuk province. Collected data were analyzed by descriptive statistics, ANOVA, and Duncan tests. The results showed that 14.3% of the respondents were underweight, 60.0% normal, and 25.7% overweight according to BMI. The appearance orientation of the respondents was revealed to be high. Skin care was the most popular appearance management behavior, followed by make-up, clothing selection, hair care and weight training. Due to appearance orientation by body type, the appearance orientation for the underweight was the highest followed by normal and overweight. There were significant differences in skin care, make-up, clothing selection, hair care among the three groups in appearance management behavior; however, no differences in weight training. Generally, appearance management behavior of the underweight was the highest, followed by the normal and the overweight. In addition, there were significant group differences in appearance orientation and appearance management behavior according to demographic variables. This study contributes basic information to the field of appearance management behavior research and beauty industry marketing strategy through a better understanding of the relationships of BMI, appearance orientation, and appearance management behavior.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.27 no.2
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• pp.234-242
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• 2017

This study investigates vibro-acoustic characteristics of a short, thick cylinder containing a slot given a pined-free boundaries. Using the finite element analysis results, structural modes of the asymmetric cylinder (with a slot) are expressed as the linear combinations of modes of the symmetric cylinder made of same material with identical geometry except the slot. Based on synthesized modal vibrations, acoustic modes of the asymmetric cylinder are obtained with two approaches, i.e., Rayleigh integral calculation and modal expansion of the acoustic modes of the symmetric cylinder. Also, acoustic powers, max. sound pressure and directivity pattern are obtained from acoustic modes and verified with the boundary element analyses. Based on these results, the accuracy of proposed approaches in calculating the vibro-acoustic properties of a short, thick, asymmetric cylinder has been confirmed. The procedure can be applied to the similar cylinders with other boundaries or asymmetric properties. Also, attenuation of vibration and/or sound radiation of the cylinder type practical components can be studied using these approaches.

• Journal of Sensor Science and Technology
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• v.17 no.2
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• pp.127-132
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• 2008

The effect of $CeO_2$ as a sintering additive on the microstructure and the piezoelectric property of yPb$(Sb_{0.5}Nb_{0.5})O_3$-(1-y)Pb$(Zr_{0.52}Ti_{0.48})O_3$ ($0{\leq}y{\leq}0.1$, PSN-PZT) for a hypersonic sound speaker (HSS) application was investigated. The samples were sintered at $1250^{\circ}C$ for 2 h. The crystal structure and surface morphology of the samples were examined using XRD and FE-SEM, respectively. Study on the influence of $CeO_2$ additives on the dielectric and piezoelectric properties indicated that the $CeO_2$-added PSN-PZT system had a high piezoelectric properties. The optimized results of ${\varepsilon}_r=1209$, $K_p$=52% $d_{33}$=351(pC/N) and $Q_m$=1230.16 were obtained at 0.4 wt.% $CeO_2$-added PSN-PZT.

• Journal of the Korean Society of Clothing and Textiles
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• v.41 no.1
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• pp.116-130
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• 2017

This study analyzed the effects of consumption value of outdoor female consumers on relationship quality and long-term relationship orientation as well as differences in consumption value, relationship quality and long-term relationship orientation by demographic characteristics. A survey was conducted from May 15-22, 2016; subsequently, 336 responses were used in the analysis. Statistical analysis methods consisted of frequency analysis, factor analysis, reliability analysis, t-test, ANOVA, and regression analysis. The results indicate that the consumption value of outdoor female consumers was composed of functional value, emotional value, epistemic value, situational value, and social value. Relationship quality was composed of satisfaction, commitment, and trust. Consumption value (functional value, emotional value, epistemic value, situational value, and social value) of outdoor female consumers positively affected satisfaction. Emotional value, epistemic value and situational value positively affected commitment; in addition, functional value and emotional value positively affected trust. Satisfaction, commitment, and trust about outdoor brand also positively affected the long-term relationship orientation; in addition, consumption value positively affected long-term relationship orientation. There were significant differences in the consumption value and relationship quality by age and marital status. The study results provide useful information for the marketing strategies of outdoor brands that consider female consumers.

• Journal of Broadcast Engineering
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• v.10 no.1 s.26
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• pp.22-30
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• 2005

We implement an interactive 3D audio broadcasting terminal which synthesizes an audio scene according to the request of a user. Audio scene structure is described by the MPEG-4 AudioBIFS specifications. The user updates scene attributes and the terminal synthesizes the corresponding sound images in the 3D space. The terminal supports the MPEG-4 Audio top nodes and some visual nodes. Instead of using sensor nodes and route elements, we predefine node type-specific user interfaces to support BIFS commands for field replacement. We employ sound spatialization, directivity/shape modeling, and reverberation effects for 3D audio rendering and realistic feedback to user inputs. We also introduce a virtual concert program as an application scenario of the interactive broadcasting terminal.

• Archives of design research
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• v.19 no.5 s.67
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• pp.151-160
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• 2006

When it comes to the paintings in Joseon Dynasty, landscape and a genre paintings were popular but it was Minhwa that people of every dass loved. Minhwa contained not only true meaning of a picture, but also it was simple and straighforwardly depicted. Among them, paintings in books belonging to the Joseon Dynasty (hereinafter called Checkgeori paintings) describe a small universe in which people live harmoniously in nature on the basis of a Confucian society. In addition, it shows modern philosophy in paintings and makes a feature of human life. In this paper, 'Ssangpok Checkgeori 'in Checkgeori paintings illustrates the relationships between things such as color, arrangement, place and direction. They have outstanding features such as the direction of things in composition, multiple vanishing points, a folding screen constituent and movement of viewpoints. Therefore, we come to know the painting method of 'Ssangpok Checkgeori' can be applied to modern paintings.