• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.1
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• pp.127-133
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• 2009

It has been 10 years long since the emergence of Dialpad, the first commercial VoIP service from Saerome Technology launched on 1999. In spite of so many research papers and implementations of the VoIP and commercial services with hundreds of VoIP-related products vendors and tens of VoIP service providers during the last decade, the resulting market share of the VoIP callings at the year 2007 in Korea is just about 0.3%, which is extraordinary lower one than expected. There have been proposed several facts for the reason including the QoS issue and the incomplete governing system. In this paper we suggest that the reason is based on the sociocultural issue and further we assert and verify that it can never replace the existing legacy telephone system for the current VoIP service model, as long as the telecommunication companies continue the legacy telephone service. We also suggest the another choice, to upgrade the concept of the current VoIP service to a new paradigm based on SIP and presence service, while letting the legacy telephone system be as it is.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.5 no.4
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• pp.51-68
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• 2010

The article analyses economic effect of medium size aircraft development project. It is based on the measurement of induced production and increased productivity by the investment on the development project. The analysis shows around 5.2 trillion KRW induced production and 65 billion KRW productivity are expected, if 1.4 trillion KRW is invested as planned. The economic effects with the same size of investment across different manufacturing industries - shipbuilding, auto, general machinery and emiconductor - are also measured for comparison. The result reports ircraft anufacturing is positioned as middle in terms of induced production nd productivity nhancement. he results in this article support the investment, which has economic asibility as well as strategic and military importance as argued.

• Journal of Engineering Education Research
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• v.1 no.1
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• pp.5-20
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• 1998

In this paper, the traditional curriculum model for engineering education, called simple hierarchical model, is critically reviewed and the problems of this curriculum model are discussed. Then a new curriculum model for engineering education is proposed to overcome the problems of simple hierarchical model and to provide an innovative education for engineering students. This new curriculum model for engineering education, called $\Pi$-structure, consists of the General Attainments Program, the Fundamental Major Program, and the Advanced Major Program, with the three components stacked in $\Pi$ shape where the first two programs are put in parallel and the third program are put on their top. The necessity, feasibility and various benefits of the $\Pi$-structured education system are widely discussed in the paper.

• School Mathematics
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• v.15 no.1
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• pp.77-99
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• 2013

The purpose of this study is to develop authentic assessment model of school mathematics completed an integral part of the classroom in the real situation to do authentic assessment about students's mathematics learning ablity. To do this, it is performed literature researches on authentic assessment system of school mathematics, situation cognition class design model, Lincoln & Guba's the forth generation assessment model, NAEP high ability assessment model, Guliker & Bastiaens & Kirschner's authentic assessment model. And it is extracted authentic assessment elements of school mathematics from them, and it is developed authentic assessment model completed an integral part of the classroom in the real situation. This authentic assessment model of school mathematics is confirmed the proper model in assessing mathematical activities and achievement by applying authentic assessment tasks with class's integrated part, and each factor and phase was regarded as the proper thing in the teaching and learning for experts in studies of mathematical education.

• Proceedings of KOSOMES biannual meeting
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• 2006.05a
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• pp.53-58
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• 2006

Recently, vessel's average speed in the sea becomes fast because of the increasing of high-speeds vessel like a container ship and ferry. So, it is considered that speed control in the korean narrow waterway isn't the proper vessel traffic management, now. And, there is a rare paper studied about speed control quantitatively and numerically, especially speed control is discussing continuously, as abrogation of Incheon Port's speed control and alleviation of Kwangyang Port's speed control a according to navigating mariner's request. After this paper replayed the navigation traffic flow in the straight waterway using marine traffic flow simulation, the Environmental Stress Model is introduced to evaluate difficulty of each vessel's traffic.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.5
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• pp.153-159
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• 2018

In recent years, the development of weapons systems in the field of defense research and development has become increasingly large, complex, and long-term, and so have budgets and the time spans involved. In order to improve this, the Weapon Systems Requirement Verification Committee, which benchmarked the preliminary feasibility of the private sector, was established to verify the appropriateness of requirements, and the necessity and priority of the projects. This research proposes a methodology for analyzing and prioritizing proposed weapons systems for effective and strategic allocation of defense budget funding. First, the evaluation factors that can be used in the defense sector were assessed by analyzing the related fields. We set the weighting of items by using the analytical hierarchy process for technical risk assessment and technical profitability evaluation. After that, we applied the methodology to 32 weapons systems and analyzed the results. In conclusion, through this study, it was possible to analyze profitability dimensions overlooked in the existing methodology.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.8
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• pp.2999-3004
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• 2010

In comparison with some other light sources, LED has merits such as long lifetime, pollution free, and high energy efficiency. Lately, due to development of LED with high brightness and capacity, LED, which has been applied in display system only, has applied in the field of lighting system. As power LED for lighting system can be burned out by heat problem, the driving current of power LED has to be controlled below the designed value. In this paper, power LED photovoltaic lighting system, which has the current limitting function, has been described. After photovoltaic power is generated from PV panel. it is charged into a battery. And then, after the charged power is converted to DC24[V] through a boost DC-DC converter, it is supplied to power LED at night. It has been validated by designing and testing of 72[W] power LED lighting system, which includes a PV charger, a boost DC-DC converter and a current limiter for driving power LED.

• Proceedings of the Korea Water Resources Association Conference
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• 2008.05a
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• pp.465-469
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• 2008

수도권의 중요한 상수원인 팔당호 수질에 큰 영향을 주고 있는 경안천 유역의 오염배출량을 저감하기 위하여 많은 인공습지조성이 계획되었으나 이들의 위치선정의 적합성에 대한 분석이 부족한 실정이다. 또한 경안천은 상류에서 중류까지는 주변 농경지의 용수공급을 위해 많은 수중보가 설치되어 물의 흐름이 단절되어있어 수리적 요소에 인공요인으로 작용하고 있으며, 하류로 갈수록 하천이 곡선형태로 흐르고 하폭 또한 넓어져 자체적으로 유기물이 증가하기 좋은 환경을 가지고 있다. 본 연구에서는 유역의 자연적, 인공적 요소를 고려한 물리적 모델을 구축하고 각 오염원특성별 부하량 분석을 통한 속성정보를 반영하였으며 오염저감시설설치 시나리오의 타당성분석을 분석을 수행하였다. 연구과정을 좀더 상세히 살펴보면 첫째, 비점오염원의 주된 경로중 하나인 축산계부하량 저감을 위하여 지형적 인자를 고려한 인공습지조성 적지분석 결과를 HSPF모델에 반영하였다. 둘째, 기존 오염 총량제에서 수행해오던 오염부하량 산정방식을 통해 산정된 양을 유역단위로 재분배 하여 오염원 분포를 반영하였다. 주요 오염부하량인 축산계와 토지계의 오염부하량만을 적용하였으며 일부 오염원 항목들은 생략하거나 하수처리시설을 통해 처리되고 있는 것으로 모의하였다. 셋째, 각 시나리오별 시뮬레이션을 수행하여 경안천 인공습지조성가능성 및 수질개선 효과를 예측하였다. 기존의 점오염원 처리시설만으로는 하천에서의 목표수질을 만족시키는데 한계가 있기 때문에 점오염원 저감시설뿐 아니라 비점오염원 저감시설인 인공습지를 기존의 처리시설에 연계하여 시나리오를 구성하였다. 기존습지시설의 오염저감율은 각 시설들의 평균값을 적용하였으며 처리효율은 BOD, TN, TP 각각 40%, 25%, 12%로 적용하였다. 오염원분포를 고려한 모의결과 현재 인공습지 입지대상지역들 중 좀 더 효율적인 오염저감 효과를 보이는 지역이 분석되었다.

• Journal of Korea Port Economic Association
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• v.28 no.4
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• pp.169-191
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• 2012

This study is to investigate the strategy on forming a long term relationship between logistics service provider and demander including maintaining strategy of it. For these purposes, effect on the organization and human factor of Logistics service companies and also, impact on the customer trust and relational commitment against service recovery are analysed. Literature review and empirical study are used to modify research model and to develop questionnaire for logistics service companies. Reliability for measuring procedure yields the same result on repeated trials and validity for identifying the accuracy of the accrual measuring instrument are also used. Suggested hypothesis are verified through multiple regression method and the testing results are shown as follows; First, organization and human factor have a positive effect to the service recovery satisfaction against the service failure of logistics service providing company. Second, the service recovery satisfaction also leads a positive effect on the customer trust and relational commitment.

• Management & Information Systems Review
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• v.29 no.1
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• pp.97-115
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• 2010

The concept that human and brand can related to each other is referred to as 'brand relationship' or 'consumer-brand relationship. By arguing that the concept of brand relationship is a readily understandable analogue, it appears that relationship thinking in the context of consumers and brands sometimes is taken for granted without thoroughly discussing its applicability. In this perspective, this paper tests the limitations with the relationship metaphor and interpersonal relationship theory by comparing the differences among product categories. And research findings as follow like these. First, even if many companies seek to anthropomorphize their brands, consumers may still don't consider them as human. Second, the possibility of personification is much higher in product categories like lead higher interaction between consumers and brands and give higher enjoyment than those of lower. And finally, consumer's personification of products are not essential factors that lead higher brand relationship.