• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2002.11a
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• pp.495-498
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• 2002

The need for network protection, accounting and resource management in foreign administrative domain requires appropriate security services. In this paper, we propose an access control protocol to support the authentication between mobile node and visiting subnet. Our hybrid way of approach aims to reduce computational overhead and minimize the use of network bandwidth. We also propose non-certificate based public-key cryptography to provide non-repudiation, which does not require CRL retrieval and certificate validation.

• Journal of Information Technology Services
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• v.12 no.4
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• pp.435-447
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• 2013

If we use a smartphone to analyze and detect falling, it is a huge advantage that the person with a sensor attached to one's body is free from awareness of difference and limitation of space, unlike attaching sensors on certain fixed areas. In this paper, we suggested effective posture analysis of smartphone users, and fall detecting system. Suggested algorithm enables to detect falling accurately by using the fact that instantaneous change of acceleration sensor is different according to user's posture. Since mobile applications working on smart phones are low in compatibility according to mobile platforms, it is a constraint that new development is needed which is suitable for sensor equipment's characteristics. In this paper, we suggested posture analysis algorithm using smartphones to solve the problems related to user's inconvenience and limitation of development according to sensor equipment's characteristics. Also, we developed fall detection system with the suggested algorithm, using hybrid mobile application which is not limited to platform.

• The Transactions of the Korea Information Processing Society
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• v.6 no.11S
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• pp.3299-3308
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• 1999

One of the most important prerequisites for a successful software process is the collaboration and software requirements negotiation of all stakeholders in the software development process. Remote users using computer networks can negotiate software requirements by computer supported system, and can share their informations. The goal of software requirements negotiation system is an integration of all win conditions and an agreement after resolution of conflicts. The existing systems need an exclusive system and must be dependent on specific platform and network. Users must have the knowledge of all stakeholder's status and use homogeneous collaborating applications. This paper presents the Web-based software requirements negotiation system for the purpose of resolution of the existing systems' problems. The Web-based software requirements negotiation system can be driven by WinWin Spiral model, and it is based on hybrid execution method. The proposed system is validated and tested on heterogeneous environments.

• Proceedings of the Korean Information Science Society Conference
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• 2011.06a
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• pp.120-123
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• 2011

모바일 디바이스와 플랫폼이 다양해지면서 개발 및 유지보수 비용이 증가하고 있다. 특히, 비즈니스 기능적인 요구사항을 충촉시킬 수 있는 사용자화면 개발방법이 중요해 지고, 높은 복잡도를 요구하는 모바일 어플리케이션의 문제점을 해결하고자 모바일 웹 어플리케이션이 등장하였다. 하지만 웹 기술요소만으로 사용자 화면을 개발하다 보니 서비스 성능이 저하됨 알 수 있었다. 이런 문제를 해결하기 위해서 하이브리드형 모바일 어플리케이tus 아키텍처를 제안만한다. 이는 웹 요소기술만을 사용하지 않고, 비즈니스 기능적인 요구사항을 충족시켜주기 위해서 UIFrame이라는 개념을 제안한다. 제안한 UIFrame 모델은 UI 표현능력, 서비스 성능향상과 디자이너의 영역과 개발자의 영역을 분리 함으로서 다양한 플랫폼에 대한 독립적이며 이식성이 우수하다. 또한 개발 효율성 및 유지보수가 용이함을 보인다.

• ETRI Journal
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• v.24 no.5
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• pp.398-400
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• 2002

Using $Cr_2O_3$ thin film, we developed a novel etch-stop technique for the protection of silicon surface morphology during deep ion coupled plasma etching of silica layers. With this technique we were able to etch a silica trench with a depth of over 20 ${\mu}m$ without any damage to the exposed silicon terrace surface. This technique should be well applicable to fabricating silica planar lightwave circuit platforms for opto-electronic hybrid integration.

• Journal of Information Processing Systems
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• v.7 no.1
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• pp.63-74
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• 2011

As a powerful and flexible processor, the Graphic Processing Unit (GPU) can offer a great faculty in solving many high-performance computing applications. Sweep3D, which simulates a single group time-independent discrete ordinates (Sn) neutron transport deterministically on 3D Cartesian geometry space, represents the key part of a real ASCI application. The wavefront process for parallel computation in Sweep3D limits the concurrent threads on the GPU. In this paper, we present multi-dimensional optimization methods for Sweep3D, which can be efficiently implemented on the finegrained parallel architecture of the GPU. Our results show that the overall performance of Sweep3D on the CPU-GPU hybrid platform can be improved up to 4.38 times as compared to the CPU-based implementation.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.24 no.9B
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• pp.1755-1766
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• 1999

A region-based video codec based on the H.263+ standard is examined and its associated novel rate control scheme is proposed in this work. The region-based coding scheme is a hybrid method that consists of the traditional block DCT coding and the object-based coding. Basically, we adopt H.263+ as the platform, and develop a fast macroblock-based segmentation method to implement the region-based video codec. The proposed rate control solution includes rate control in three levels: encoding frame selection, frame-layer rate control and macroblock-layer rate control. The goal is to enhance the visual quality of decoded frames at low bit rates. The efficiency of proposed rate control scheme applied to the region-based video codes is demonstrated via several typical test sequences.

• Annual Conference of KIPS
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• 2014.11a
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• pp.530-533
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• 2014

IT 산업의 발전과 함께 Big-Data 와 보안은 빠른 속도로 발전하고 정보보호를 위해 다양한 시스템을 구축하는 것보다는 이를 연계하고 활용하는 것이 중요한 시대가 도래하였다. 한 기업이 가지고 있는 기업정보유출사고 등 다양한 해킹공격 또한 꾸준하게 증가되고 있다. 더불어 경제적 사회적인 손실이 증가되면서 국가 및 기업 상위 감사 기관은 정보보호 관련 법 제도를 제정하고 이를 강화하여 개정 하고 있다. 하지만, 물리적, 관리적, 기술적으로 연계된 통합 보안 관리 체계가 제대로 구현되지 않는다면 다양한 취약점을 통하여 기업 정보는 언제든 유출 될 수 있다. 본 논문에서는 기업에서 기 운영중인 정보보안 솔루션과 물리보안 솔루션이 효과적으로 통합 보안 관제가 가능한 IMP 플랫폼 구성설계 방안과 불법 침입 및 보안 사고 탐지를 위한 복합시나리오 설계 방안을 제시하여 실 적용 효과를 알아보고 향후 연구 방향을 제시하고자 한다.

• Journal of Power Electronics
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• v.19 no.5
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• pp.1315-1325
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• 2019

Aiming at the negative sequence and harmonic problems in the operation of railway static power conditioners, an optimization compensation strategy for negative sequence and harmonics is studied in this paper. First, the hybrid RPC topology and compensation principle are analyzed to obtain different compensation zone states and current capacities. Second, in order to optimize the RPC capacity configuration, the minimum RPC compensation capacity is calculated according to constraint conditions, and the optimal compensation coefficient and compensation angle are obtained. In addition, the voltage unbalance ${\varepsilon}_U$ and power factor requirements are satisfied. A PSO (Particle Swarm Optimization) algorithm is used to calculate the three indexes for minimum compensating energy. The proposed method can precisely calculate the optimal compensation capacity in real time. Finally, MATLAB simulations and an experimental platform verify the effectiveness and economics of the proposed algorithm.

• International Journal of Computer Science & Network Security
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• v.22 no.2
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• pp.290-296
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• 2022

Big Data is a data analysis technology empowered by late advances in innovations and engineering. In any case, big data involves a colossal responsibility of equipment and handling assets, making reception expenses of big data innovation restrictive to little and medium estimated organizations. Cloud computing offers the guarantee of big data execution to little and medium measured organizations. Big Data preparing is performed through a programming worldview known as MapReduce. Normally, execution of the MapReduce worldview requires organized joined stockpiling and equal preparing. The computing needs of MapReduce writing computer programs are frequently past what little and medium measured business can submit. Cloud computing is on-request network admittance to computing assets, given by an external element. Normal arrangement models for cloud computing incorporate platform as a service (PaaS), software as a service (SaaS), framework as a service (IaaS), and equipment as a service (HaaS).