• The Journal of the Acoustical Society of Korea
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• v.34 no.5
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• pp.360-370
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• 2015

In case that an infinite length waveguide structure is connected with a finite length structure, it is required to combine a wave approach for the waveguide structure and a modal approach for the finite length structure to investigate the dynamic response of the connected target structure. In this study, the wavenumber finite element (WFE) analysis is adopted for the infinite length waveguide substructure and a finite element (FE) method is applied for the finite length substructure and then their results are coupled in terms of the impedance or mobility at the connected points between the substructures. As a structural model, an infinite length cylindrical shell with a rectangular plate inside is regarded. These two substructures are connected at the four corner points of the plate, rigidly or resiliently. From this investigation, it was confirmed that the wave approach (WFE method) and modal approach (FE method) can be combined by the impedance coupling.

• Journal of Korea Game Society
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• v.16 no.5
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• pp.159-168
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• 2016

$Pok{\acute{e}}mon$ Go is an augmented reality (AR) game developed jointly by Niantic and Nintendo. It's a new type of augmented reality role-playing game (RPG) where AR elements like location information, visual recognition technology and GPS navigation technology are integrated with the intellectual property of the popular $Pok{\acute{e}}mon$ anime. The global success of $Pok{\acute{e}}mon$ Go can be attributed to the innovative incorporation of AR technologies into the game but also to the utilization of the Pokemon story which had been developed for 20 years. In summary, Pokemon Go is the fruitful result of a successful storytelling that combines the humanistic imagination of a popular, cultural archetype and the engineering imagination of AR game technologies.

• Journal of Mushroom
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• v.14 no.3
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• pp.105-110
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• 2016

This study was carried out to develop techniques for the log cultivation of Pleurotus pulmonarius. Soil landfill cultivation of the in plastic container boxes containing yield per log than but there was no difference in the yield from both spawn Hyangsan" variety. In the case of soil landfill cultivation in a shaded vinyl house, an Ailanthus tree gave a higher yield than that using poplar tree, and the yield of the Hosan" variety was higher than that of the Hyangsan" variety. With regard to proper tree species selection, willow and cherry trees were good for both the Hosan" and "Hyangsan" variet.

• Journal of Broadcast Engineering
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• v.20 no.2
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• pp.215-223
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• 2015

Energy harvesting technique is an energy charging technique for communication device in energy-constrained environment. Recently, energy harvesting technique that harvests energy from wireless radio frequency signal is proposed. Representatively, there are time switching technique and power splitting technique. This paper proposes an optimal harvesting time allocation scheme in a wireless cognitive relay network when secondary user relay uses energy harvesting technique to transmit information. Secondary user relay receives information and energy simultaneously from the secondary user source's signal via time switching technique. We aim to maximize the instantaneous throughput by optimizing harvesting time of the secondary user relay. Simulation results show that using optimized harvesting time gets larger instantaneous throughput compared to using constant harvesting time.

• The Journal of the Korean dental association
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• v.54 no.8
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• pp.604-612
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• 2016

The aim of this study was to evaluate the effect of national health insurance coverage of periodontal scaling using the National Health Insurance Service-National Sample Cohort for 2009-2013. After the enforcement of periodontal scaling covered by national health insurance, the number of patients diagnosed with periodontal disease and received treatment, has increased from 35,234 to 99,576 people in the last 4 years. Further, the number of patients who received the treatment of periodontal disease more than once, have also increased to around 69% in 2013 when compared to 2012. Moreover, the number of patients receiving periodontal scaling has been steadily increasing every year. Among the patients who visited hospital for periodontal disease, there has been an increase of 280%. As a result, continuous public relations and long-term research on the effect of periodontal scaling as a prophylactic treatment is necessary.

• The Journal of Korean society of community based occupational therapy
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• v.2 no.2
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• pp.37-49
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• 2012

Objective : The purpose of this study is to investigate the effect of mental practice on increasing balance and fall index & fall efficacy scale of persons with post stroke. Method : As a single subject research design with multiple baseline across individuals, the patients were four stroke patients, employed in this study. The employed program included receiving mental practice, and measuring balance score changes using FRT for 4 weeks, including baseline and intervention periods. The subject's fall danger were measured by Fall Index Test(Tetrax) and Fall Efficacy Scale for balance ability were analyzed. The analyses were performed using visually and Two Standard Deviation Band Method. Result : Using FRT, the participants improved their standing balance. During the intervention periods, Their improvement of balance skills results in decreasing Fall Index increasing Fall Efficacy. Conclusion : As a result of this study, mental practice can be an effective method to improve the balance of stroke patien.

• The Journal of Korean society of community based occupational therapy
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• v.4 no.1
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• pp.85-92
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• 2014

Objective : In this study, we tried to know what kind of exercise was more effective in sleep disorder by comparing melatonin in blood after applying low, median, with high intensity exercise in sleep disorder. Methods : We divided 90 into 3 groups and performed low, moderate, and high intensity exercise, respectively for 8 weeks in K city. Results : As a result, first, there was a significant change of global PSQI score in moderate intensity exercise comparing with before and after exercise. Second, there was a significant change of global PSQI score in moderate intensity exercise comparing with low and high intensity exercise. Third, there was a significant change of melatonin in blood in moderate intensity exercise comparing with before and after exercise. Forth, there was a significant change of melatonin in blood in moderate intensity exercise comparing with low and high intensity exercise. Conclusion : In this study, we observed change of EEG and melatonin in blood to know how did continued exercise according to intensity of exercise have effect on sleep disorder. In conclusion, it was more effect to apply moderate exercise. It can help progress of life of quality through improvement of sleep disorder and they stay healthy during the rest of time.

• Korean Journal of Construction Engineering and Management
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• v.10 no.4
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• pp.3-13
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• 2009

When promoting BTL(Build Transfer Lease; below BTL) project, negotiation is a stage of examining observation and reflection of RFP(Request for Proposal below RFP) in terms with facilities, operating and financing. It keeps an important position in whole process. However, there is no consistent guideline or model which helps evaluating the result of negotiation. It is difficult to apprise the quantitative outcome after executing negotiation. Thus, this study presented the Value Engineering -based process and model of estimating the outcome of negotiation for the purpose of estimating and verifying the result of negotiation objectively, Evaluating factors of negotiation were classified into 6 fields, 38 divisions and 135 items, focused on cultural facilities on BTL project. Weight of every factor was estimated, and quantitative checklist was established. This study presented the model which could measure the outcome of negotiation. This result would be a critical checklist before negotiation on BTL project, an index of feedback during negotiation, and also a standard of estimating the outcome after negotiation.

• Journal of Broadcast Engineering
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• v.21 no.1
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• pp.113-116
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• 2016

Cognitive radio network technology is that secondary (unlicensed) users use the spectrum of primary (licensed) users without interfering primary communication. In this paper, we propose multiple access scheme for a cognitive radio network, where multiple secondary users access spectrum of one primary user. We consider two types of multiple access scheme, one is p-persistent and one is non-persistent, and apply these two schemes in the secondary network. For each multiple access scheme, total throughput of secondary network is derived and verified by Monte Carlo simulation. Simulation results show that maximum total throughput of the secondary network is achieved when channel access probability or the number of maximum waiting frames is chosen appropriately.

• The Journal of Internal Korean Medicine
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• v.39 no.4
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• pp.570-591
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• 2018

Objective: This study was designed to investigate the correlation between gastric emptying measurement by ultrasonography and the findings of various questionnaires of functional dyspepsia (FD) or in Korean medicine to explore the possibility of quantification of questionnaires. Methods: Eighty-eight patients (44 patients with FD and 44 healthy controls) were recruited from October 2016 to November 2017. Gastric emptying half-time (T1/2) was measured by ultrasonography at fasting, and at 0, 15, 30, 45, 60, 90, and 120 min after meals (apple juice, 500 ml, 224 kcal). The average half-time (average T1/2) was calculated by averaging all measured half-times. A visual analogue scale (VAS), food retention questionnaire (FRQ), damum questionnaire (DQ), cold and heat questionnaire (CHQ), deficiency and excess questionnaire (DEQ), spleen-qi deficiency questionnaire (SQDQ), Nepean dyspepsia index-Korean version (NDI-K), and quality of life of NDI (NDI-QoL) were filled out by all participants. Correlation between the average T1/2 and questionnaires were analyzed for 79 patients (37 patients with FD and 42 healthy controls) after excluding missing and erroneous data. Results: The FRQ, DEQ, SQDQ, NDI-K, and NDI-QoL scores, especially for some gastrointestinal symptoms and general weakness-related symptoms, showed statistically significant correlations with average T1/2. Conclusions: Our results suggest that gastric emptying measurement by ultrasonography may be a quantitative substitute method for some Korean medical questionnaires or for some dyspepsia-related and deficiency-related items among them. However, further studies using various measurements of gastric emptying will be needed.