• Geomechanics and Engineering
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• v.12 no.4
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• pp.723-738
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• 2017

Rock is a heterogeneous material, which introduces complexity in the analysis of rock slopes, since both the existing discontinuities within the rock mass and the intact rock contribute to the degradation of strength. Rock failure is often catastrophic due to the brittle nature of the material, involving the sliding along structural planes and the fracturing of rock bridge. This paper proposes an advanced discretization method of rock mass based on block theory. An in-house software, GeoSMA-3D, has been developed to generate the discrete fracture network (DFN) model, considering both measured and artificial joints. Measured joints are obtained from the photogrammetry analysis on the excavation face. Statistical tools then facilitate to derive artificial joints within the rock mass. Key blocks are searched to provide guidance on potential reinforcement measures. The discretized blocky system is subsequently implemented into a discontinuous deformation analysis (DDA) code. Strength reduction technique is employed to analyze the stability of the slope, where the factor of safety can be obtained once excessive deformation of slope profile is observed. The combined analysis approach also provides the failure mode, which can be used to guide the choice of strengthening strategy if needed. Finally, an illustrated example is presented for the analysis of a rock slope of 20 m height inclined at $60^{\circ}$ using combined GeoSMA-3D and DDA calculation.

• The Journal of the Korea Contents Association
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• v.14 no.6
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• pp.262-270
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• 2014

Considering that few studies had paid attention to the living characteristics and social environment surrounding amblyopes, the present study surveyed the parents of children aged 3 to 12 and diagnosed-with amblyopia to analyse the time when the children were first diagnosed-with amblyopia, the characteristics of their living environment and the socio-environmental factorsand to delve into correlations. For the purpose of this study, 104 parents of patients in 4 hospitals in Seoul, Gyeonggi and Incheon consented to participate in the survey from September 2 to November 23: 2013. As for the time when the children were first diagnosed with amblyopia: the age of 4 accounted for the highest percentage(28.8%). The older the parents were: the later the children were diagnosed with amblyopia (p<.01). The higher the education of parents, the earlier the diagnosis of amblyopia(p<.05). The present findings-will be conducive to decreasing the number of patients who have no choice but to live-with low vision for life by missing some timely visual acuity tests and ophthalmological examination and particularly to developing a social safety net that can realize national medical welfare for the low-income families and the socially disadvantaged class.With the help of information technology.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.21 no.12
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• pp.2347-2356
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• 2017

Raspberry Pi has been widely used for a hardware platform to develop the Internet of Things (IoT) applications. The basic task of diverse IoT devices is to obtain their status or environmental information by using various sensors and to send them to a gateway or a remote server. For the purpose, one of application layer protocols for IoT, MQTT is widely used. IoT devices are often powered by batteries and they are required to operate for a long time without replacing or recharging their batteries. Thus, energy efficiency is one of the most critical problems for obtaining and sending sensor data. To develop energy-efficient IoT applications, the information about power consumption characteristics of the applications is necessary. However, there has been little study to analyze power consumption of IoT communication on IoT devices. This paper presents a study to measure and analyze the power consumption of sending/receiving data under various conditions via the MQTT protocol on Raspberry Pi.

• Journal of Convergence for Information Technology
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• v.8 no.1
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• pp.115-121
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• 2018

The purpose of this study is to examine the effects of kindergarten teachers' rights and obligations on teacher - A questionnaire survey was conducted on 174 teachers in kindergartens in Seoul, Gyeonggi, and Incheon. The results of this study are as follows: First, teachers' rights have a statistically significant effect on the rights of education and status in linguistic interaction, which is a sub-domain of teaching-infant interaction. And in behavioral interactions, the rights of labor have had a negative impact. In the linguistic interaction and emotional interaction, which are subdivisions of teacher-infant interaction, teacher's duty had a statistically significant effect on the duties of status, while teacher's duty was the sub-domain of inter- Duties of integrity and duty and duty of status did not affect.

• Journal of Convergence for Information Technology
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• v.8 no.5
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• pp.205-210
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• 2018

We will investigate in depth the reasons why companies have a negative mindset and produce complaints about the internship system itself. On the other hand, we try to find out the success factors of domestic companies that have introduced and operate the exemplary internship system, and prepare policies to disseminate them. In order to do this, I would like to diagnose the problems related to the internship system in the current industry through questionnaires or interviews with existing internship students. It is hoped that this will help the participating students to have a positive mindset about the company and further contribute to the career search and adaptation to the firm from the university to the firm.

• Journal of Convergence for Information Technology
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• v.8 no.5
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• pp.37-43
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• 2018

The study was implemented the convergence research on oral health beliefs G area S university convergence course. The final analysis of 168 students agreed to research purpose and method was conducted from March 26 to June 11, 2018. The benefits was highest at 3.99 points, and the severity was lowest at 2.01 about oral health belief. The t-test and ANOVA outcome about oral health improvement behavior and oral health belief were dental clinic visit was benefits and importance, scaling experience was sensitivity, benefits and importance, use of auxiliary oral care products was importance to be statistically significant. The imported oral health beliefs for oral health improve and a variety of programs for oral health education need to be developed within university to learn knowledge of oral health behavior and attitude changed for correct oral health beliefs.

• Journal of the Korean Chemical Society
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• v.43 no.6
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• pp.614-620
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• 1999

The critical micelle concentration (CMC) and the counterion binding constant (${\beta}$) at the CMC of the mixtures of Dodecylpyridinium chloride (DPC) and Tetradecyltrimethylammonium bromide (TTAB) have been determined from the concentration dependence of electrical conductance at various temperatures from $4^{\circ}C$ to $36^{\circ}C$. Thermodynamic parameters (${\Delta}C_p$, ${\Delta}G^o_m$, ${\Delta}H^o_m$ and ${\Delta}S^o_m$), associated with the micelle formation of DPC/TTAB mixtures, have been estimated from the temperature dependence of CMC and ${\beta}$values. The measured values of ${\Delta}C_p$ and ${\Delta}G^o_m$ are negative but the values of ${\Delta}S^o_m$ are positive in the whole measured temperature region. The values of ${\Delta}H^o_m$ are positive at low temperature region and negative at high temperature region. The results show that all of the thermodynamic parameters are dependent on temperature and mole fraction of DPC(${\alpha}_DPC$).

• Journal of Digital Contents Society
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• v.19 no.3
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• pp.445-451
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• 2018

Recently, transmedia is evolving constantly without clear theories and definitions. In this paper, we reviewed the previous researches on transmedia and summarized the transmedia concept studied before. Furthermore, we analyzed the cases of , and which are examples of the transmedia and researched whether these three cases belonged to the category of the transmedia concept discussed above. The pattern of is almost similar to definition and type of the previously discussed transmedia. However, the cases of and don't match on the concepts presented by existed researches perfectly. This paper includes the necessity of the expanded definition and redefinition on the evolving transmedia, in addition, presents the changed definition on transmedia, through reviewing the limitations of the existing transmedia storytelling concept based on these three cases.

• Journal of the Korea Convergence Society
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• v.8 no.10
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• pp.9-17
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• 2017

The current study attempted to develop and operate an exercise prescription expert system based on cloud computing. Recently, concerns on health are increasing due to the development of healthcare technology, increased life expectancy, and enhanced concerns on the body figure and wellbeing among Koreans. This trend pushes up the demand for the personal trainers and exercise specialists. However, supply of the exercise specialists are less than the demand. This study tries to develop exercise prescription system, aggregate diverse data, develop artificial intelligence rule, and operate exercise prescription expert system and education system. This system may assist training exercise professionals by replacing off-line training programs into on-line training programs. Further researches are recommended to connect diverse IoT devices and big data.

• Journal of Ocean Engineering and Technology
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• v.22 no.4
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• pp.8-13
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• 2008

In this study, an investigation of shear wave ultrasonic technique was carried out to detect stacking orientation error for CF/Epoxy quasi-isotropy composite laminates. The ultrasonic shear wave is particularly sensitive to ply orientation and layup sequence in tire CF/Epoxy composite laminates. In the manufacturing of composite laminates, it is important that layup errors be detected in samples. In this work, an effect was mack to develop shear wave techniques that can be applied to composite laminates. During testing, the mast significant problem is that the couplant conditions do not remain the same because of its changing viscosity. The design and use of a shear ware transducer would greatly alleviate the couplant problem. A pyramid of aluminum, with isosceles triangle (two 45o angles) sides, was made to generate shear waves, using two longitudinal transducers based on an ultrasonic-polarized mechanism. A signal splitter was connected to the pulser jack on a pulser/receiver and to the longitudinal transducers. The longitudinal transducers were mounted with mineral oil, and the shear transducer was mounted with burnt honey on the bottom as a receiver. The shear wave was generated at a maximum and a minimum based on the ultrasonic-polarized mechanism. Results show it is feasible to measure layup error using shear wave transducers on a stacking of prepregs in composites.