• International Journal of Computer Science & Network Security
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• 제21권11호
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• pp.287-293
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• 2021

The purpose of this article is to consider the distance education system, its principles, features and means. One of its existing and promising tools is video conferencing. The article discusses the types of video conferencing, hardware and software, features and requirements for communication channels, types of information transmitted through these channels.

• International conference on construction engineering and project management
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• The 1th International Conference on Construction Engineering and Project Management
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• pp.808-813
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• 2005

Effective cost management requires reliable cost estimates at every stage of project development. The primary purpose of this research is to develop systematic modeling procedures and an automatic computing program for infrastructure estimating in the Texas Department of Transportation (TxDOT). The computing system toggles between project input information and segregated district unit prices for highway work item quantity estimates associated with earthwork and landscape, subgrade treatments and base, surface courses and pavement, structures, miscellaneous construction, and lighting, signing, markings and signals. This quantity-based approach was chosen because of the conventional approach lacking of quantity information until primary design is complete.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 한국정보통신학회 2022년도 추계학술대회
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• pp.418-419
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• 2022

In this paper, the design of the fusion sensor mechanism was divided into primary and secondary design, and the device design and case design were divided to facilitate the safety of the sensor, sensor coupling, and connection with power.

• Proceedings of the Korean Society of Computer Information Conference
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• 한국컴퓨터정보학회 2024년도 제69차 동계학술대회논문집 32권1호
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• pp.471-472
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• 2024

본 논문에서는 초등학생을 위한 데이터 분석 대회를 활용한 데이터 분석 프로그램을 개발하였다. 데이터 분석 프로그램은 ADDIE 모형에 개발하였다. 분석 단계에서 G초등학교 학생들의 데이터 분석 도구인 스프레드 시트를 학습한 경험이 적고 배우고자 하는 동기가 없었다. 하지만 교육과정에서 공학도구로 활용하도록 제시되어 있다. 이를 바탕으로 디자인 학생들이 스프레드 시트를 학습할 수 있는 프로그램과 이를 실습할 수 있는 데이터 분석 대회를 디자인 하였다. 개발 단계에서는 LMS를 활용하여 학생들에게 학습을 위한 데이터를 제공하고 학습하며, 데이터 분석 대회에서는 학습한 데이터와 문제만 제공하여 대회에 참여하면서 실습할 수 있는 기회를 제공하였다. 평가 도구로는 데이터 리터러시 평가 도구를 선정하였다.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• 제9권4호
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• pp.428-438
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• 2016

The aim of this study, in order to reduce the support burden of dementia primary caregiver, within the framework of long-term care insurance system to present its founding model for the development of new services. Previous research as analytical materials and based on the CARE study between 2012 to 2013. Primary caregiver burden of patient are both physical, psychological and economic aspects as well as difficulties in many aspects and had influence on many factors such as age, care burden, economic, health, and social support. It also came high-risk primary caregiver suffer from depression. This primary caregiver to take advantage of the elderly long-term care insurance system implemented at the time of the institutional support necessary for since 2008, presented additional services in this study. Of increasing the small sizes day care center (tentative name) to open an as established in the settlements at a scale of less than nine, within 5 minutes from the residence, limited dementia by expertise in the disease home care services scale model of the current system service It was to improve the quality of existing shares, small group sizes for day care centers and community life apart.

• Journal of Positioning, Navigation, and Timing
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• 제2권1호
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• pp.1-8
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• 2013

A signal system for improving the code acquisition complexity of Global Navigation Satellite System (GNSS) receiver is proposed and the receiving correlator scheme is presented accordingly. The proposed signal system is a hierarchical code type with a duplexing configuration which consists of the Zadoff-Chu (ZC) code having a good auto-correlation characteristic and the Pseudo Random Noise (PRN) code for distinguishing satellites. The receiving correlator has the scheme that consists of the primary correlator for the ZC code and the secondary correlator which uses the PRN code for the primary correlation results. The simulation results of code acquisition using the receiving correlator of the proposed signal system show that the proposed signal scheme improves the complexity of GNSS receiver and has the code acquisition performance comparable to the existing GNSS signal system using Coarse/Acquisition (C/A) code.

• Journal of The Korean Association of Information Education
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• 제18권2호
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• pp.275-284
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• 2014

In this study, we analyzed algorithm curriculum in Korea, the United Kingdom, the United States, India, and Estonia. In order to teach 1st - 9th grade students computer algorithm, we suggested the algorithm framework based on the spiral curriculum, which is repeatable and progressive. The framework is divided into 4 areas, which includes understanding, expressing, evaluating, and using algorithms in daily life. Each area has 4 levels which are based on the students grade. We have to offer lectures for about computer OS to student teachers at the National Universities of Education; to develop textbooks and materials about algorithm; and to establish Information Science as a part of the primary school curriculum.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권12호
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• pp.6000-6017
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• 2018

This paper presents a new descriptor, named Histograms of Prominent Edge Directions (HPED), for the recognition of facial expressions in a person-independent environment. In this paper, we raise the issue of sampling error in generating the code-histogram from spatial regions of the face image, as observed in the existing descriptors. HPED describes facial appearance changes based on the statistical distribution of the top two prominent edge directions (i.e., primary and secondary direction) captured over small spatial regions of the face. Compared to existing descriptors, HPED uses a smaller number of code-bins to describe the spatial regions, which helps avoid sampling error despite having fewer samples while preserving the valuable spatial information. In contrast to the existing Histogram of Oriented Gradients (HOG) that uses the histogram of the primary edge direction (i.e., gradient orientation) only, we additionally consider the histogram of the secondary edge direction, which provides more meaningful shape information related to the local texture. Experiments on popular facial expression datasets demonstrate the superior performance of the proposed HPED against existing descriptors in a person-independent environment.

• Journal of Power Electronics
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• 제19권2호
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• pp.353-362
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• 2019

To address the problem of circulating current loss in the traditional zero-current switching (ZCS) full-bridge (FB) DC/DC converter, a ZCS FB DC/DC converter topology and modulation strategy is proposed in this paper. The strategy can achieve ZCS turn on and zero-voltage and zero-current switching (ZVZCS) turn off for the primary switches and realize ZVZCS turn on and zero-voltage switching (ZVS) turn off for the auxiliary switches. Moreover, its resonant circuit power is small. Compared with the traditional phase shift full-bridge converter, the new converter decreases circulating current loss and does not increase the current stress of the primary switches and the voltage stress of the rectifier diodes. The diodes turn off naturally when the current decreases to zero. Thus, neither reverse recovery current nor loss on diodes occurs. In this paper, we analyzed the operating principle, steady-state characteristics and soft-switching conditions and range of the converter in detail. A 740 V/1 kW, 100 kHz experimental prototype was established, verifying the effectiveness of the converter through experimental results.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 한국정보통신학회 2019년도 춘계학술대회
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• pp.243-246
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• 2019

In cognitive radio networks, secondary transmitters should cease its transmission immediately under the detection of primary transmission in the spectrum they are using. Then they need to exploit another idle spectrums and resynchronize to the newly found idle spectrums. Most of related work presume the existence of separate control channel used by secondary users commonly for exchanging the information of idle spectrums. However, this presumption is not feasible in real world cognitive radio scenario. Therefore we address a proactive spectrum synchronization scheme with no need of separate control channel. Our scheme lets secondary users exchange the spectrum information periodically during normal communication process and determine the next spectrum band in advance of detecting primary transmission. We evaluate our scheme in a real world cognitive radio environments set up with USRPs.