• Journal of the Korean Recycled Construction Resources Institute
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• v.10 no.1
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• pp.111-116
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• 2022

Recently, building structures tend to be super high-rise and large-scale with the development of concrete technology. When high-rise building is constructed of reinforced concrete structure, it has a disadvantage that its own weight increases. Light weight aggregate(LWA) was developed to compensate for these shortcomings. Manufacturing concrete using these light weight aggregates has the advantage of reducing the self weight of the reinforced concrete structure, but has a disadvantage in that the strength of the concrete is reduced. In this study, an experimental study was conducted to investigate the strength characteristics of hardened cement according to the presence or absence of surface coating of lightweight aggregates. As a result, in terms of compressive strength, the surface-coated lightweight aggregate exhibited higher strength than the uncoated lightweight aggregate. Also, it was considered that this is because the interfacial voids of the surface coated lightweight aggregate mixed cement hardened body were filled with blast furnace slag fine powder particles.

• The Journal of the Acoustical Society of Korea
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• v.41 no.3
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• pp.326-334
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• 2022

In this paper, we propose speech enhancement algorithm as a pre-processing for robust speech recognition in noisy environments. Auxiliary-function-based Independent Vector Analysis (AuxIVA) is performed with weighted covariance matrix using time-varying variances with scaling factor from target masks representing time-frequency contributions of target speech. The mask estimates can be obtained using Neural Network (NN) pre-trained for speech extraction or diffuseness using Coherence-to-Diffuse power Ratio (CDR) to find the direct sounds component of a target speech. In addition, outputs for omni-directional noise are closely chained by sharing the time-varying variances similarly to independent subspace analysis or IVA. The speech extraction method based on AuxIVA is also performed in Independent Low-Rank Matrix Analysis (ILRMA) framework by extending the Non-negative Matrix Factorization (NMF) for noise outputs to Non-negative Tensor Factorization (NTF) to maintain the inter-channel dependency in noise output channels. Experimental results on the CHiME-4 datasets demonstrate the effectiveness of the presented algorithms.

• Korean Journal of Psychosomatic Medicine
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• v.30 no.2
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• pp.165-171
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• 2022

Objectives : This study was conducted to investigate the effect of 1-year administration of second-generation antipsychotics (SGAs) on the platelet activity in patients with schizophrenia through a retrospective review of the medical records. Methods : The mean platelet component (MPC) value was used as an index of the platelet activity. The included subjects (N=24) were the patients who were confirmed to have taken SGAs continuously for one year after the first MPC measurement had been performed. The change of MPC was verified through a paired sample t-test. Results : The result revealed that the mean MPC value was significantly decreased from 26.5±1.4 g/dL to 25.6±1.8 g/dL after 1-year administration of SGAs from the time of the first MPC measurement. Conclusions : This study suggests that 1-year administration of SGAs may be related with increased platelet activity, and that close monitoring for risks such as cerebrovascular/cardiovascular or thromboembolic diseases may be necessary during SGAs treatment in clinical practice.

• The Journal of the Korea institute of electronic communication sciences
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• v.17 no.6
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• pp.1013-1024
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• 2022

In addition to the assessment measure of electric quality levels, load loss are also a factor in hindering the financial profits of electrical sales companies. Therefore, accurate analysis of load losses generated from distributed power networks is very important. The accurate calculation of load losses in the distribution line has been carried out for a long time in many research institutes as well as power utilities around the world. But it is increasingly difficult to calculate the exact amount of loss due to the increase in the congestion of distribution power network due to the linkage of distributed energy resources(DER). In this paper, we develop smart grid big data infrastructure in order to accurately analyze the load loss of the distribution power network due to the connection of DERs. Through the preprocess of data selected from the smart grid big data, we develop a load loss analysis model that eliminated 'veracity' which is one of the characteristics of smart grid big data. Our analysis results can be used for facility investment plans or network operation plans to maintain stable supply reliability and power quality.

• Journal of Advanced Technology Convergence
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• v.1 no.2
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• pp.11-17
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• 2022

The purpose is to find out where medical workers can receive the minimum radiation does in clinical. In order to sett RQR standard quality of radiation, put a Al 1.5mm filter(row and column: 10 cm × 10 cm) on X-ray tube. Al 0.9 mm, Cu 0.3 mm, Ni 0.3 mm used as a filter. The Acrylic phantom were set to 13.1 cm, 18.5 cm, 21.1 cm. by the object thickness was different. As a results, when we use Al 0.9 mm, 1853 nSv was the highest numeral. It is a point of anode low 50 cm, when we use 13.1 cm Acrylic phantom. When we use Cu 0.3 mm, 173 nSv was the lowest numeral. It is a point of anode low 150 cm, when we use 13.1 cm Acrylic Phantom. In this study, it was confirmed that the spatial scattering dose decreased as the distance from the X-ray tube increased. It is considered that more studies on the exposure of scattered doses are needed in the future.

• Journal of the Korea Computer Graphics Society
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• v.28 no.3
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• pp.101-111
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• 2022

Conditional autonomous vehicles should hand over control to the driver according on driving situations. However, if the driver is immersed in a non-driving task, the driver may not be able to make suitable decisions. Previous studies have confirmed that the cues enhance take-over performance with a directional information on driving. However, studies on the effect of take-over cues on the driver's brain activities are rigorously investigated yet. Therefore, this study we evaluates the driver's brain activity according to the take-over cue. A total of 25 participants evaluated the take-over performance using a driving simulator. Brain activity was evaluated by functional near-infrared spectroscopy, which measures brain activity through changes in oxidized hemoglobin concentration in the blood. It evaluates the activation of the prefrontal cortex (PFC) in the brain region. As a result, it was confirmed that the driver's PFC was activated in the presence of the cue so that the driver could stably control the vehicle. Since this study results confirmed that the effect of the cue on the driver's brain activity, and it is expected to contribute to the study of take-over performance on biomakers in conditional autonomous driving in future.

• The Journal of the Korea Contents Association
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• v.21 no.11
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• pp.733-747
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• 2021

In this study, the researcher analyzed the mediating effect of the parental career support the moderating effect of grit in the structural path of the youth activity competence, career decision self-efficacy, and parental career support in the influence of the active capability of the adolescents in career decision self-efficacy. Data analysis was conducted through a questionnaire survey on a total of 515 people. First, youth activity competency was found to have a positive effect on parental career support. Second, parental career support was found to have a positive effect on career decision self-efficacy. Third, youth activity competency was found to have a positive effect on career decision self-efficacy. Fourth, parental career support was found to have a significant mediating effect in the influence of the youth activity competence in career decision self-efficacy. Fifth, as a result of multi-group analysis on the youth grit low/high group, it was verified that a significant influence relationship was established for the grit low/high group in all pathways.

• Journal of Korea Entertainment Industry Association
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• v.14 no.8
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• pp.117-130
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• 2020

The Golden Dragon is a work that reminds us of the tragic illusion of globalization through the story of Asian workers' lives in Berlin, a strange city. Also, the post-epic nature of the play requires the audience to see it in a new way, more different than before. In Korea, there are theoretical studies on the post-epic theatre, but there is little research on specific acting approaches based on practical production process. Therefore, I first analyze the post-epic characteristics of The Golden Dragon in order to present specific acting approaches. As a result, it would be confirmed that body-centered acting approaches were required in the post-epic theatre to play more different roles than in the realism play. Thus, Laban movement Analysis(LMA) of Rudolf von Laban is applied so that internal impulses could be naturally induced through the utilization of the body. Of the four categories of motion(BESS), Laban seeks to look at the body-centered acting approaches through the effort. Finally, it must be confirmed through the actual production process that Laban's theory of motion could be used as a body-centered acting approach to creating the role of post-epic theatre.

• The Journal of the Convergence on Culture Technology
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• v.8 no.5
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• pp.577-582
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• 2022

Credit transactions are used as a means of price discrimination from competitors in order for suppliers to increase customer demand. In particular, in the case of a two-stage supply chain consisting of a supplier, a retailer, and a customer, the deferral of payment for goods allowed by the supplier is a means of reducing the inventory investment cost of the retailer. Retailers have the opportunity to discount the selling price while anticipating an increase in end-customer demand through the reduction of the inventory investment cost. In view of the fact that such trade credit is provided for the purpose of increasing demand as a means of discrimination from competitors, it may be more general that the credit transaction period is allowed flexibly according to the transaction volume. In particular, in the case of deteriorating products, the credit transaction period given according to the order volume is a factor that increases the order volume of the retailer, but product deterioration can be a limiting factor in the increase in the order volume. The deterioration rate actually plays an important role in determining the inventory policy of the retailer. Therefore, in this paper, the effect of such deterioration rate on the inventory policy of retailer is analyzed.

• Analyses & Alternatives
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• v.6 no.2
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• pp.117-154
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• 2022

The purpose of this study is to verify the practical validity of financial sanctions, which has recently emerged as the most powerful form of economic sanctions preferred by U.S. foreign policy tool. Based on the theoretical discussion, analyse this study the trend of de-dollarization appearing in connection with financial sanctions and argue that the effectiveness of financial sanctions erode the dollar financial hegemony, which is the source of its power can be degraded, so that its effectiveness could not be so great as most people likely think about. After World War II, there has been an increasing tendency in the international community to favor economic sanctions over the use of military force as an effective means of foreign policy. Among these economic sanctions, a distinct feature that has recently appeared is the remarkable increase in the frequency of use of financial sanctions. The country that favors financial sanctions most is the United States. The reason is that they believe that the power of their own dollar financial hegemony can exert deadly pressure on other countries. Financial sanctions favored by the United States are said to have increased the effectiveness of sanctions by upgrading the pressure of sanctions to the next level. Nevertheless, financial sanctions have a side that underestimates the cost. This problem is found in the signs that the backlash from not only countries subject to financial sanctions but also many countries with interests in these countries is leading to a tendency to de-dollarization. This study will try to see how likely this de-dollarization trend is to offset the effectiveness of financial sanctions.