• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.13 no.1
• /
• pp.259-266
• /
• 2013

Since the wireless communications have a limited transmission, the devices just around a master node can exchange data. Though Bluetooth and Zigbee support ad hoc, they are not appropriate for real-time voice communications. In this paper, we present a TDMA-based relay protocol for several users to communicate simultaneously. The proposed protocol can relay data or voice to other nodes in real-time by the multi-hop transmission method using TDMA. And the proposed protocol improves the network performance by allocating different frequencies to the slaves depending on the routing path scheduled by the routing table. NS-2 simulation shows that the performance of the proposed protocol is good in terms of the transmission delay and pecket loss probability in the real-time voice transmission.

• Journal of Technologic Dentistry
• /
• v.37 no.4
• /
• pp.191-197
• /
• 2015

Purpose: The purpose of this study was to compare the accuracy of the scan data acquired by the extra-oral and intra-oral scanner. Methods: The maxillary right first molar was made of polymethyl methacrylate(PMMA) specimen. This PMMA specimen was scanned with a engineering scanner and intra-oral scanner. Meanwhile, extra-oral scanner scanned stone die duplicated from PMMA master die. Trueness and precision of scan datas was measured by 3-dimensinal inspection. Independent t-test was conduct to analysis the significant difference(a=0.05). Results: In the trueness analysis, mean of discrepancies were 13.82um for intra oral scanner and 16.84 um for extra-oral scanner. In the precision analysis, mean of discrepancies were 11.72 for inta-oral scanner and 9.2 for extra-oral scanner. Both trueness and precision showed a statistically significant difference (Table 1, p<0.05). Conclusion: Intra-oral scanner can show higher trueness than extra-oral scanner, it has lower precision.

• International Journal of Highway Engineering
• /
• v.17 no.4
• /
• pp.69-75
• /
• 2015

PURPOSES : The hydrated lime-modified asphalt, which improves moisture resistance, is normally used for pavements to reduce the number of potholes. However, the method of applying the material properties of the lime-modified asphalt mixture for use in pavements is not covered in the Korean Pavement Research Program (KPRP). The objective of this research is to find a method for the design application of lime-modified asphalt's material properties to the KPRP. METHODS: The section for test design is selected in some conditions which are related to the level of design regarding Annual Average Daily Traffic (AADT). To define the application methods of hydrated lime in the KPRP, the models of fatigue, rut and international roughness index (IRI) are determined based on the M-EPDG test results from some earlier research results. Moreover, it is well known that dynamic moduli of the unmodified mixture are not different from those of the lime-modified mixture. RESULTS: The performance results of hydrated lime-modified asphalt pavement were not very much different from those of the unmodified pavement, which meant the limited design regulations regarding fatigue failure, rutting deformation and IRI. CONCLUSIONS: The KPRP uses the weather model from the data for previous 10 years. It implies that the KPRP cannot predict abnormal climate changes accurately. Hence, the predictive weather data regarding the abnormal climate changes are unreliable. Secondly, the KPRP cannot apply the moisture resistance of asphalt mixtures. Therefore, a second level of design study will have to be performed to reflect the influence of moisture. It means that the influence on pavement performance can be changed by the application of hydrated lime in asphalt mixture design.

• Korean Journal of Remote Sensing
• /
• v.30 no.6
• /
• pp.719-730
• /
• 2014

Small BAseline Subset (SBAS) technique using multi master interferograms can be effective to detect surface deformation in forest area. In this paper, The analysis reveals area of 2-dimension surface deformation at Seguam Island in Aleutian Arc., Alaska. We acquired ERS-1/2 data from track 201 and 473 datasets on Seguam Island from 1992 to 2008. This study analyze surface deformation applying Differential Interferometry Synthetic Aperture Radar (DInSAR) and SBAS time series method using two adjacent tracks. As a results, it was calculated that subsidence -1~2 cm in LOS direction and - 2~3 cm in vertical direction. The horizontal direction was repeated contraction and expansion. The observation of 2-dimension displacements explained the volcanic activity on Seguam island. Also, it is believed to be used for basic data to estimate movements of magma source.

• Journal of Advanced Navigation Technology
• /
• v.15 no.5
• /
• pp.705-713
• /
• 2011

In this paper, we introduce two techniques for resolving integer ambiguities between reference stations, which is one of the most important processes in Network RTK correction generation process. Each techniques uses Hatch filter and combination of L1/L2 measurements and we used simulation data and real data to evaluate performance of the techniques. For evaluating performance of each technique, we compared corrections generated from user site and Network RTK. As a result, Network RTK with the technique which uses Hatch filter improves user performance much more than single baseline RTK does. Residual of user is smaller than a half size of wavelength so it does not affect user integer ambiguity resolution, however, it contains significant bias error. On the other hand, when we used the technique which uses combination of L1/L2 measurements, residual error of user is largely reduced compared to the technique using Hatch filter.

• Journal of the Korean Society of Costume
• /
• v.56 no.2 s.101
• /
• pp.70-82
• /
• 2006

The purpose of this study was to analyze the trends and features of male fashion and hair style image and thereby, determine the relationship between fashion and hair styles, and thus, provide for some basic data for future studies about male hair styles as well as for new male hair style trends. For this purpose, relevant literature was extensively reviewed including some visual materials. The major references for this study were domestic and foreign books, journals and preceding studies about fashion and hair. The visual materials referred to for this study were domestic magazines specialized in fashion and hair, visual data supplied by hair product brands, Korea Beauty Parlor Journal, Beauty and Cosmetic Newspaper, Beauty Today, and such fashion special websites as $S{\cdot}F{\cdot}I,\;C{\cdot}F{\cdot}T$, firstview.com, fashionwide.com, etc. Based on the results from a questionnaire survey of master or Ph degree holders of apparel science, reputed designer were sampled and then, 80 works were finally sampled from their collections published between January, 2002 and April, 2005. As a result of analyzing the images shown in modern male apparel and hair style fashions by classifying them into natural, restored, folklore and eclectic ones, it was confirmed that both male apparels and hair styles have been reinterpreted in modern terms depending on social and cultural settings to be expressed as new styles, and in particular, that male hair styles have evolved diversely into new styles depending on fashion tendencies, while having been versatile in some relationships with their fashion tendencies.

• The Journal of the Korea Contents Association
• /
• v.13 no.3
• /
• pp.468-484
• /
• 2013

The purpose of this study was to examine the problems of a multi-cultural family counseling as a support for the families in order to suggest efficient education programs for counselors. For these reasons, this study used interviews of three focus-groups consisting of 11 experts each other, and then the qualitative data was analyzed. The analysis of data was conducted by two doctors and one master and investigated by a multi-cultural counselor. As a result, 5 categories, 13 sub-categories, and 46 definitions were identified. Each five categories were the problems of multi-cultural counseling, effective multi-cultural counseling skill, the qualities of a counselor with multi-cultural attitude and recognition, multi-cultural knowledge factors and effective teaching methods. At last, implications, practical uses, and suggestions for future researches were also discussed in this study.

• The Korean Nurse
• /
• v.31 no.2
• /
• pp.70-85
• /
• 1992

Relaxation technique is an independent nursing intervention used in various stressful situations. The concept of relaxation must be explored for the meaning given by the people in their traditional thought and philosophy. Korean relaxation technique, wanting to become culturally acceptable and effective, is learning to recognize and develop Korean concepts, experiences, and musics of relaxation. This study was aimed at discovering Korean concepts, experiences and musics of relaxation and contributing the development of the relaxation technique for Korean people. The subjects were 59 mursing students, 39 hospitalized patients, 61 housewives, 21 rural residents and 16 researchers. Data were collected from September 4th to October 24th, 1991 by interviews or questionaires. The data analysis was done by qualitative research method, and validity assured by conformation of the concept and category by 2nursing scientists who had written a Master's thesis on the relaxation technique. The results of the study were summerized as follows; 1. The meaning of the relaxation concept; From 298 statements, 107 concepts were extracted and then 5 categories "Physical domain", "Psychological domain", "Complex domain", "Situation", and "environment" were organized. 'Don't have discomforts, 'don't have muscle tension', 'don't have energy(him in Korean)', 'don't have activities' subcategories were included in "Physical domain". 'Don't have anxiey', 'feel good', 'emotional stability', 'don't have wordly thoughts', 'feel one's brain muddled', 'loss of desire' subcategories were included in "physical domain" 'Comfort body and mind', 'don't have tension of body and mind', 'be sagged' 'liveliness of thoughts' subcategories were included in "Complex domain". 'Rest', 'sleep', 'others' subcategories were included in "Situation domain". And 'quite environment' & 'comfortable environment' subcategories were included in "Environmental domain". 2. The experiences of the relaxation; From 151 statements, 59 experiences were extracted. And then 9 categories-at rest after physical activities, after problem solving, fancy, bathing in the bed, situation, rest, particular time, others-were organized. 3. The musics of the relaxation; From 229 statements, 108 musics were extracted. and the 9 categories- Western classical music, semi classical music, Korean song, Korean popular classical music, song, western popular sonhg, hymn, characteristics of music, others - were organized. In conclusion, There are some differences between Korean concepts, experiences and musics of relasation and western concepts, experiences and musics of relaxation.

• The Journal of the Acoustical Society of Korea
• /
• v.30 no.6
• /
• pp.337-343
• /
• 2011

With commencing trial 3D digital broadcasting, the studies on next generation digital broadcasting technology for coming UHDTV era is being actively progressing. In this paper, I propose surround audio formats for next-generation digital TV broadcasting, along with comparative study of major surround audio formats in use or under development. I did comparative study on current major competing surround formats such as Dolby True HD and DTS HD MA, along with NHK proposed 22.2 channel surround format for UHDTV system. Upon this comparative study and our housing situation consideration, I propose lossy compression 3D surround 7.1 channel surround format along with loosless 2.0 and 4.0 hi-fi format as next generation digital TV broadcasting standard. In lieu with this, I also propose transmitting binaural 2 channel audio data as sub-audio. It will give holographic sound experience when properly processed with individual HRTF (Head Related Transfer Function) with headphone. The table for data rate of each proposed audio format is also presented.

• Culinary science and hospitality research
• /
• v.24 no.1
• /
• pp.1-12
• /
• 2018

This study tried to understand what emotional consumption value of dessert cafe is and to examine the difference between satisfaction and subjective well - being concept. In addition, this study tried to test hypotheses through empirical analysis by establishing research hypotheses on how affective consumption value affects satisfaction and subjective well - being, and how satisfaction and subjective well - being influence loyalty. Data collection was conducted from September 10, to October 10, 2017, and 210 questionnaires were distributed. 200 valid data were used for the analysis except the questionnaires that did not meet the research purpose. The results of the analysis were as follows. First, only the hedonic consumption value of the dessert cafe had a significant effect on satisfaction, whereas the aesthetic consumption value and symbolic consumption value had no significant effect on satisfaction. Second, the hedonic consumption value and symbolic consumption value had a significant effect on subjective well - being. On the other hand, aesthetic consumption value did not had a significant effect on subjective well - being. Third, the satisfaction and subjective well-being of dessert cafe had a significant effect on loyalty. The result of this study is meaningful in establishing a strategy of differentiating dessert cafe to grasp the satisfaction of dessert cafe and emotional consumption value which increases subjective well-being and thereby maintain loyal customers.