• Journal of the Korean Society for Railway
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• v.15 no.5
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• pp.524-530
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• 2012

Recently, open access policy to railway operation has been widely discussed. Compared to the case of Korea, European countries have dealt with this topic over a few decades. The competition on railway slots incurs an important technological problem about how to optimally allocate railway slots requested from RUs to them. In other words, the authority should be able to coordinate the timetables requested from RUs in the non-discriminatory manner. Related with the coordination, compared to the other European countries, which have done many studies and experiments especially on auction mechanisms, Korean railway has paid less attention to this topic and there have not been any related studies. Our study analyses the state-of-the-arts about the railway slot allocation especially focusing on the auction mechanisms and the associated optimization problems. And we suggest a new railway slot allocation mechanism and related optimization model reflecting the adjustment within the tolerance and the operational policies between railway undertakings.

• 한국IT서비스학회:학술대회논문집
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• 2005.05a
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• pp.532-539
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• 2005

최근 세계적으로 전자정부에서의 시민역량을 증대시키기 위한 노력이 시작되는 동향을 보이고 있다. 이에 따라 거버넌스 관점에서 시민참여에 대한 이론 및 실증적 연구가 활발히 진행되고 있으나, 거버넌스 지원을 위한 차세대 전자정부시스템의 개발에 대한 연구는 상대적으로 적은 관심밖에 받지 못하고 있다. 거버넌스 지원 전자정부시스템은 주로 정부기관의 기능 강화에 초점을 두고 있는 기존의 전자정부시스템과 달리 능동적인 시민참여에 중점을 두어야 하며, 복잡하고 정보가 광역 분산된 민주사회 환경에서 보안과 프라이버시 등의 핵심 민주주의 가치를 유지하면서도 시민을 포함한 모든 구성원 사이의 정보공유와 이를 위한 조정 기능을 제공하여 모든 참여자가 정보를 적절히 공유할 수 있는 능력을 향상시킬 수 있도록 하여야 한다. 이러한 거버넌스 지원 전자정부시스템의 개발에 중요한 요소 중의 하나는 보안과 프라이버시를 유지하면서도 쌍방간의 정보공유를 가능하게 하는 P2P 통신 메커니즘이다. 본 논문은 거버넌스 지원 전자정부시스템의 특성과 요구사항을 살펴 보고 이를 바탕으로 P2P 통신에 대한 요구사항과 적합한 P2P 통신 모델에 대하여 논한다.

• Journal of the Korean Geotechnical Society
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• v.38 no.7
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• pp.25-37
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• 2022

In this paper, a small-scale model testing system was developed using a series of small-scale model tests to analyze the mechanism of compaction pile formation and evaluate the quality of controlled grading aggregates proposed as an alternative material to the sand compaction pile (SCP) method and granular compaction pile (GCP). These are the most typical ground improvement methods in field practice, particularly for soft grounds. However, the SCP has faced difficulties due to the supply shortage of natural sand and the corresponding price surge of sand. The GCP is limited in marine soft grounds because of the failure occurring at the pile tip caused by excessive expansion of the deeper bulbs, leading to uneven bulb formation. The uniformity of compacted pile bulbs is critical to ensuring the bearing capacity and quality of the compaction pile. This study aims to evaluate the performance of the new material and controlled grading aggregates using small-scale model tests simulating field compaction process to investigate its potential application in comparison with SCP. The compaction piles are examined in four cases according to different materials used for compaction pile and clay strength. The compaction pile materials, which are made of sand and controlled grading aggregates, used in this study were compared to reveal the mechanism of the bulb creation. The experimental data confirm that the bulb formation quality of the traditional sand and the new material, controlled grading aggregates are comparable. The compaction pile made of controlled grading aggregates presents higher bearing capacity than that of marine sand.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2000.10a
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• pp.125-128
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• 2000

1996년 통신법의 개정이후 미국의 주된 통신정책의 기본원칙은 시장주체의 자율적 조정메커니즘의 함양, 경쟁을 위한 신규서비스 기술의 유연한 채택의 보장 등으로 할 수 있겠다. 이러한 것을 보장하는 장치로 대표적인 것은 표준화 기구에 의한 통신기술표준화 활동이 있을 수 있겠지만 다른 한편으로는 기존통신사업자에 부가되는 통신망 공시 및 통신설비의 제조가 허가된 BOC들이 개발하는 기술규격의 공시 역시도 일정부분 기여하는 것이 사실이다. 우리나라도 역시 이를 위한 전기통신사업법 등에 기간통신사업자의 정보제공형식으로 공시의무를 부여함으로써 외형적으로 통신사업자 설비 설치의 투명성 제고 및 통신망간 상호호환성 확보를 위한 제도적 장치를 마련한 것이 사실이다. 본 논문에서는 이러한 관점에서 우리나라와 미국 통신사업자의 통신망 공시제도 절차 및 운영동향을 살펴보고 향후 바람직한 공시체계의 정립에 시사점을 제공코자 한다.

• Proceedings of the Korean Information Science Society Conference
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• 2000.10a
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• pp.370-372
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• 2000

다중 사용자 환경에서 새로운 소프트웨어 개발하기 위해서는 특정 사용자 관점이 아닌 다양한 관점에서의 의견이 최대로 반영된 소프트웨어 아키텍쳐를 설계할 필요가 있다. 그리고 설계 과정에서의 이러한 다양한 관점에서의 의견들을 조정하기 위한 협동 작업을 자동화해 줄 수 있는 메커니즘 또한 필요하다. 이 연구에서는 소프트웨어 아키텍쳐 설계 과정에서 사용자들의 의견을 최대한 반영한 아키텍쳐 설계를 위해 기존의 다중 계층 소프트웨어 아키텍쳐 관리 방법을 사용하고, 이러한 다중 계층 소프트웨어 아키텍쳐의 효율적인 재구성을 위한 자동화 방안으로 에이전트 기법을 도입한다.

• Proceedings of the Korean Fiber Society Conference
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• 2001.10a
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• pp.251-254
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• 2001

천연염료는 합성염료에 비해 고급스럽고 자연스러운 색상을 연출할 수 있을 뿐만 아니라 여러 가지 기능성이 있어서 최근 많은 연구가 진행되고 있다. 그러나 추출, 보관에의 어려움과 각종 견뢰도, 특히 일광견뢰도가 낮은 단점을 가지고 있다. 황색을 발현하는 대표적인 염재인 황련과 황백의 경우에도 항균, 방취성 등의 장점이 있으나 일광 견뢰도가 낮아 과거에는 임산부용 속옷이나 유아용 기저귀감 등 일광에의 영향을 많이 받지 않는 용도로 이용되었으며, 현재는 일부 기능 전수자에 의해 전통염색이 명맥을 잇고 있을 뿐이다. (중략)

• Food Science and Industry
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• v.40 no.3
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• pp.59-65
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• 2007

• KSCE Journal of Civil and Environmental Engineering Research
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• v.26 no.1A
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• pp.173-181
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• 2006

Many isolated bridges are designed and constructed after the introduction of the seismic design. However those bridges designed in engineering fields have unnecessarily high serviceability limit and brittle failure mechanism, which do not satisfy the seismic design concept. Such design results are due to the excessive substructure stiffness of the conventional design method as well as the misunderstanding of the seismic design method. In this study an isolated bridge designed with the conventional design method is selected and the same bridge with steel bearings is modelled for the comparative seismic design. From the comparison, the seismic design procedures satisfying the required performance levels are provided for the two bridges. It is confirmed that the isolated bridge requires more complicated design procedure with trial and error methods and reanalyses but provides higher serviceability limit compared to the bridge with steel bearings. However, because the required serviceability limit can also be obtained by adjusting substructure stiffness, it is a resonable seismic design process that an isolated bridge is to be considered as an alternative design when the ductile failure mechanism is not obtained with a bridge with steel bearings.

• Management & Information Systems Review
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• v.36 no.5
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• pp.1-26
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• 2017

In the meantime, research on corporate informatization focuses on the completeness of information technology itself and its financial effects, so there is insufficient research on whether information technology can support business strategy. It is necessary to verify whether the management strategy implementation of the company can be led through the informatization of the enterprise and the relation between the main mechanism factors and the informatization performance. In this study, what a mechanism factor is applied in the process of result creation of informatization from three mechanism perspectives such as selecting mechanism, learning mechanism and coordinating mechanism with cases of representative domestic IT company and what an importance mechanism factors have been ascertained. This study results in 8 propositions. For a main agent of companies, securement of information capability of organizations has been selected to realize informatization results and investment of informatization has been selected to solve organizational decentralization problems as the most important factor. Additionally, as competition in the industry gets fierce, investment on informatization has been changed to a utility way of implementation of strategies and decision on investment has been made through the official process and information technology. Differentiated company capability has been made based on acquisition of technical knowledge and company information has been expanded to its whole employees through the information system. Also, informatization change management and outside subcontractor management have been acknowledged as an important adjustment factor of company. The first implication of this study is that since case studies on mechanism factors that preceding studies on informatization results did not empirically cover have directly been dealt with based on experiences of executives in charge of business and in charge of informatization, this study can provide practical views about factors that should be mainly managed for informatization results of IT companies. Secondly, since ser-M framework has been applied for IT companies for the first time, this study can academically contribute to companies in other fields about main mechanism factors for result creation of informatization based on deeper understanding and empirical cases.

• Journal of KIISE:Information Networking
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• v.29 no.1
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• pp.1-14
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• 2002

The most important issue in providing multimedia traffic on a mobile computing environments is to guarantee the mobile host(client) with consistent QoS(Quality of Service). However, the QoS negotiated between the client and network in one cell may not be honored due to client mobility, causing hand-offs between cells. In this paper, a call admission control mechanism is proposed to provide consistent QoS guarantees for multimedia traffics in a mobile computing environment. Each cell can reserve fractional bandwidths for hand-off calls to its adjacent cells. It is important to determine the right amount of reserved bandwidth for hand-off calls because the blocking probability of new calls may increase if the amount of reserved bandwidth is more than necessary. An adaptive bandwidth reservation based on an MPP(Mobility Pattern Profile) and a 2-tier cell structure has been proposed to determine the amount of bandwidth to be reserved in the cell and to control dynamically its amount based on its network condition. We also propose a call admission control based on this bandwidth reservation and "next-cell prediction" scheme using an MPP. In order to evaluate the performance of our call admission control mechanism, we measure the metrics such as the blocking probability of our call admission control mechanism, we measure the metrics such as the blocking probability of new calls, dropping probability of hand-off calls, and bandwidth utilization. The simulation results show that the performance of our mechanism is superior to that of the existing mechanisms such as NR-CAT1, FR-CAT1, and AR-CAT1.