• Science of Emotion and Sensibility
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• v.25 no.1
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• pp.103-114
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• 2022

Global virtual reality (VR) and augmented reality (AR) markets are growing as VR and AR become a new source of revenue for industries around the world. In the edutech sector, an industry that combines traditional education, research on new innovative educational models and business models are scarce, and improvements are needed in the technology group and business environment to realize edutech in detail. Therefore, this study aims to define the elements strategically required for VR Toon development by comparing and analyzing the characteristics of existing touch panel-based display Toon and VR Toon content experiences. Tablet PC Toon and VR Toon were selected to conduct the research. Thirty people (19 men and 11 women) from their teens through their forties were surveyed using questionnaires. The questionnaires were formulated through a quantitative method by using AttrakDiff with a 7-point scale (-3: negative words to 3: positive words). Qualitative evaluations were also performed addressing nine concepts (satisfaction, novelty, operability, creativity, understanding, education, interest, participation, expressiveness). As a result, the usability test results of educational content using tablet personal computers and VR equipment were analyzed from the viewpoint of user experience to define elements expected to be strategically required for VR Toon development.

• Journal of Service Research and Studies
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• v.5 no.2
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• pp.199-216
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• 2015

The current research suggests a new service research framework for service researchers and practitioners. A comprehensive and streamlined research framework is essential for rapid growth of service industry with support of academic researches. An in-depth analysis on relevant service research fremeworks and major research issues on service sector and service nature has been performed. Past and present research frameworks on service sector have been reviewed based on the nature of service and the desirability for service industry development. A new research framework has been derived and a five-section model has been suggested. The results of this research can be used for finding useful research topics in service sector. Future research is needed to develop service research as a solid and major academic field in the new economy.

• Explosives and Blasting
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• v.19 no.3
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• pp.105-113
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• 2001

채석, 굴착, 가공과 같은 워터젯 응용분야에서 대상재료에 깊은 홈(kerf)을 절단할 수 있는 실험실용 회전식 슬로터(slotter)를 제작하여 암석을 대상으로 워터젯 시스템의 절단효율을 시험하였다. 고압펌프는 유율 7.5 l/min, 압력 379 MPa, 용량 75 kW급의 JETPAC을 주로 사용하였고, 암석시료는 화강석인 제천석, 거창석을 사용하였다. 시험과정에서는 물과 연마재 투입에 의한 절단 및 진동식 슬로터에 의한 슬롯절단 기초시험을 먼저 수행하고, 그 결과를 토대로 회전식 슬로터에 의한 절단시험을 실시하였다. 순수한 물에 의한 시험의 결과 고압수류의 토출압력은 절단심도에 정비례하였고, 노즐의 이송속도는 이차함수 형태의 반비례 관계를 보였다. 연마재 투입시험에서는 순수한 물에 의한 경우에 비해 연마재로 인한 충격력의 증가로 절단심도가 크게 증가하였는데, 유사한 조건하에서 3~5배 이상의 절단심도의 증가를 보였다. 진동식 슬로터에 의한 슬롯절삭에서는 생성된 슬롯의 내벽면이 바닥으로 갈수록 좁아짐으로써 넓은 폭의 슬롯형성은 가능하나 절삭심도가 제한되었다. 회전식 슬로터에 의한 시험에서 생성된 슬롯들은 평균 22 mm의 폭으로 내벽면이 바닥까지 서로 평행하여 깊은 심도까지 비트진입이 가능하였다. 절단율은 16~32 mm/sec의 속도범위에서 $40~160{\;}\textrm{mm}^2/sec$로 나타났다. 한편, 최대유율 24 l/min의 HUSKY S-200 펌프에 의한 시험결과 JETPAC 펌프에 비해 1.13~3.47 배의 절단심도를 보였다

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.47 no.11
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• pp.30-35
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• 2010

Network coding is a new research area that may have interesting applications in practical networking systems. With network coding, intermediate nodes may send out packets that are linear combinations of previously received information. The exploration of numerical, theoretical and operational networking issues from new perspectives that consider coding at network nodes. We have presented a network coding approach which asymptotically achieves optimal capacity in multi-source multicast networks. Our analysis uses connections that we make between network coding. In this paper we analysed with and without network coding performance. Also we discussed the simulation results on network coding with linear optimization problem and it shows how network coding can be used.

• Journal of the Korean Society for Railway
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• v.12 no.6
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• pp.953-960
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• 2009

In the major operation section of urban railway, there has been occurred habitual delay, and delay propagation and spread to consecutive trains. Therefore, this delay cause the increase of operation time and irregular operation, also the increase of crowd and inconvenience to passengers. The railway operation plan is a promise to passengers and must have reliability. In the case of high frequency urban operation, dwell time have considerable influence on operational headway, so it is very important to efficiently plan and control the dwell time at stations. In this paper, the survey of the research on dwell time for urban railways is presented. The practical estimation model for minimum required dwell time, and the numerical example and validity are proposed.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.9 no.4
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• pp.51-61
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• 1989

The classical spectral analysis of random vibration is not applicable to the random vibration of nonlinear structures or the dynamic response of active mechanical systems whose governing equations contain random parametric and inhomogeneous excitations. If the random load is simulated, dynamic responses can be obtained with the application of numerical integration schemes to the governing equations of above problems. Thus, in this paper, efficient and practical methods of simulating nonstationary random seismic ground accelerations are presented by using the fast Fourier transform technique. Typical applications of the simulated ground accelerations are the simulations of the dynamic response of rotor-bearing systems under earthquake excitations. The study of accuracy is presented to determine the applicability and practicality of methods of simulation.

• Journal of the Microelectronics and Packaging Society
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• v.13 no.3 s.40
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• pp.27-32
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• 2006

The occurrence frequency of lightning and surge from the weather accident is increasing recently, which the damage scale have been enlarged every year. A protection system development to solve these problems have been risen to a multinational concern field. In this paper, a novel protection system is proposed to restrain lightning and various surges which happen in electricity and communication equipment. The proposed protection system is designed to the structure to restrain the rise of the earth potential which is become to the problem of conventional protection system. The secondary damage as a result does not happen. The practicality of the developed surge protection system is proved through various accident occurrence simulator.

• 한국IT서비스학회:학술대회논문집
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• 2002.06a
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• pp.165-172
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• 2002

전통적으로 소프트웨어 프로젝트는 납기지연, 예산초과, 높은 결함율 등으로 타 산업분야의 프로젝트에 비해 매우 높은 실패율을 기록하고 있는 것으로 알려져 있다. 이 같은 소프트웨어 프로젝트의 실패원인에 대한 많은 연구결과는 소프트웨어가 갖고 있는 범위와 요구사항 정의의 어려움, 비가시성으로 인한 초기견적의 부정확성, 역시 가시성의 부족으로 진행상황파악의 어려움에 따른 진척관리의 애로, 더욱 큰 문제는 변경의 용이성과 변경에 대한 추적의 어려움 등을 지적하고 있다. 실패한 프로젝트들의 내용을 보면 대부분 계획의 부정확성이나 위험에 대한 대처의 부족 또는 진행 중 발생하는 변경에 대한 통제의 실패에서 찾아 볼 수 있다. 정확한 예측과 위험 예방 그리고 효과적인 통제대책이 소프트웨어 프로젝트를 성공으로 이끄는 3두 마차라는 지적이다. 정확한 예측의 핵은 프로젝트 산출물인 제품에 대한 정확한 규모측정에 있고, 위험 예방은 복잡도가 높거나 불확실성이 높은 컴포넌트의 자원소요에 대한 예측과 이에 대한 준비의 소홀에서 찾을 수 있으며, 효과적인 통제대책은 프로젝트 관리 프레임워크가 튼튼하지 못하거나 이의 준수를 위한 노력의 결핍에서 찾을 수 있을 것이다. 본 논문에서는 이 3두 마차 중 가장 근간이 되고 시발점이 되는 제품의 규모에 대한 예측에 초점을 맞추어 규모측정에 가장 합리적이고 객관적이며 실용성이 높다고 현재 국제적으로 높은 평가를 받고 있는 기능점수를 프로젝트 관리에 어떻게 활용해야 프로젝트를 성공시킬 수 있을 지의 방법에 대한 검토 결과를 제시고자 한다.

• The Journal of the Korea institute of electronic communication sciences
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• v.8 no.7
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• pp.979-986
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• 2013

Recently, in the electric, electronic, robotic, and medical industries, a great attention has been paid to the development of MEMS-based smart devices with a compact size and highly intelligency. The MEMS technology is very effective in designing into a compact size and lightweight by combining into one the complex electrical, mechanical, chemical, and biological features which are required by smart devices, and at the same time, in bulk batch manufacturing. Therefore, this study, to prepare for upcoming new MEMS-based technological paradigm, analyzes MEMS processes and then considers its Applications.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.2
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• pp.852-857
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• 2011

The shipbuilding industry needs automation and mechanization to solve reduction of skilled workers and labor shortage. Ship manufacturing process is the lack of automation than standardized manufacturing field. In this paper, we design and development an process automation system for hand rail production. Mechanical parts of the cutting process was designed with efficiency, productivity and reliability, CATIA and ANSYS, the stability of the mechanical structure was confirmed. System control using a PCNC controller to provide an open and scalable, and operate using touch-screen display control and monitoring of the system was performed. The automatic system successfully passed the driving test and processing test, and it showed an excellent performance.