• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.8
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• pp.3012-3020
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• 2010

VPN can give safety in connection in Timbuc-too, by corporation's basis communication means today that transfer user support in Timbuc-too is required compulsorily, VPN is activated. This research wishes to investigate base technology of VPN software field and investigate VPN software market trend and standard and develop estimation model of VPN software. For this special quality of VPN software investigation / analyze and investigate or analyze market trend and standard this to VPN software to base deduction of estimation item and estimation model develop.

• Proceedings of the Korea Society for Simulation Conference
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• 1999.04a
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• pp.65-69
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• 1999

Switching System(이하 교환 시스템)이 QoS(Quality of Service)를 유지하면서 처리 가능한 최대 동시 호처리 능력을 검증하기 위하여, 수학적 분석을 이용한 해석적 방법, 실제 호를 사용한 통계적 방법 등이 제안되었다. 해석적 방법을 이용해 산출한 교환 시스템의 최번시 동시 호 처리능력(BHCA, Busy Hour Call Attempt)은 단지 수학적인 예측일 뿐이므로 이를 검증하기 위해서 가상 호 발생기가 제안되었다. 이 가상호 발생기는 가입자의 행동을 시스템 하위 프로세서(가입자 정합 Device 제어 프로세서)에서 Simulation하여 가상의 호를 발생시키고, 이를 통해 교환기 최대 동시 호 처리 용량을 시험하기 위한 SW이다. 이 가상호 발생기는 동일한 형태의 호를 동시에 다량으로 발생시킴으로써 교환 시스템의 주 프로세서(Main Processor, MP)의 동시 호 처리 용량을 시험하기 위한 SW이다. ITU-T 권고에 의하면 시스템부하가 90~95%를 넘어 서는 경우는 예외적인 처리(과부하 제어 등)를 권고하고 있으므로 MP 부하 90~95%에서 BHCA를 계산하면 최대 호 처리 용량이라 할 수 있다. 가상 호 발생기는 시스템 개발 초기에 실제 가입자 정합 Device 와 호 발생기 없이도 MP 과부하 지점까지 호를 발생시킴으로써 개발의 시간 및 비용을 절약할 수 있도록 하고, 계획된 시스템 용량을 만족하기 위해 필요한 조치를 교환 시스템 개발 초기에 취할수 있도록 한다. 또한, 과부하 지점에서 MP가 정상 동작하는지 검증하는 도구로 사용 가능하다. 앞으로 이를 더 발전시키면 가상호 발생기를 이용한 다양한 시스템 검증 및 분석에 이용할 수 있을 것이다. 본 논문은 가상호 발생기의 구조와 최대 용량 시험 방법을 소개하고, 더 나아가 호 Traffic에 대한 최대 용량 시험뿐 아니라 QoS를 향상시키기 위한 교환 시스템의 제반 성능 시험 및 분석에 이를 이용하기 위해 개선이 필요함을 서술하고자 한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.10a
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• pp.375-378
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• 2009

DDoS attacks make people can't using normal internet service, because DDoS attacks cause exhaustion of network bandwidth or exhaustion of computer system resources by using many personal computers or servers which already infected computer virus from hackers. Recent DDoS attacks attack government brach, financial institution, even IT security company. IT security companies make Anti-DDoS product for defense from DDoS attack. But, There is no standard for BMT of Anti-DDoS product. In this dissertation, Anti-DDoS product quality characteristics of the survey analysis to evaluate them by comparing the assessment items were derived.

• Journal of the Korean Geotechnical Society
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• v.24 no.10
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• pp.113-120
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• 2008

It is difficult to acquire good-quality fill material for levee in field and it is the most important factor of levee construction technology to use the bed sediment for the safe and economic construction. So, it is necessary to evaluate geotechnical characteristics of bed sediment, design and construction method through field application tests. In this study geotechnical characteristics of Hyunpoong bed sediment (SP) in Daegu were analyzed, and laboratory/field compaction test for mixing granite weathered soil (SW) was performed. And field mixing method was suggested.

• Journal of the Korea Convergence Society
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• v.11 no.6
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• pp.37-42
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• 2020

In the field of public informatization maintenance business, the attacks of external illegal users such as unauthorized leakage, destruction, and alteration due to intentional or inadequate management of personal information are increasing. In order to prevent such security incidents in advance, it is necessary to develop and quantitatively manage SLA indicators. This study presents the privacy SLA indicators and suggests specific methods such as information collection method and timing of the privacy SLA indicators. In order to confirm the validity and reliability of the proposed SLA indicators, an online survey was conducted with a group of experts. As a result, it was evaluated that compliance rate of personal information destruction and compliance rate of personal information protection system would be effective when applied to new and revised SLA indicators in terms of importance and validity. In the future, using SLA indicators for personal information protection as a standard for public information maintenance will contribute to improving SW quality and securing safety.

• Journal of The Korean Association of Information Education
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• v.5 no.2
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• pp.288-301
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• 2001

The essence of adapting education to the information age consists of two parts. One is the building of infrastructure for information education and the other is putting information and communication technology to educational use. Moreover, from a usage point of view, it is the most important thing that secures much educational software of good quality supporting adapting schools to the information age. It does mean the investigation about the plan of evaluation of educational software is important. Thus, in this study, we provide scientific information for efficient selection and use of educational software as end-users, and provide objective evaluation criteria of quality as a developer. In addition, through this research, we can lay the foundation for adapting education to the information age. For this purpose, we analyzed previous research relevant to the evaluation of educational software, divided the criteria of evaluation into three parts, educational, applicational, and technical, and develop the criteria of evaluation in detail.

• Journal of KIISE
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• v.45 no.3
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• pp.242-250
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• 2018

For high-quality software development, it is necessary to detect and fix the defects inserted. If defect management activities are not properly performed, it will lead to the project delay and project failure due to rework. Therefore, organizations need to establish defect management process and institutionalize it. Process standard models handle defect management in the area of project monitoring and control. However, small organizations experience difficulties in implementing and applying defect management process in a real situation. In this paper, we propose a defect management process for small organization which is designed in accordance with the characteristics of a small projects such as few participants and short development period. The proposed defect management process will be based on a tool chain with open source software such as Redmine, Subversion, Maven, Jenkins that support a defect management process and SW Visualization in systematic way. We also proposed a way of constructing defect database and various methods of analyzing and controlling defect data based on it. In an effort to prove the effectiveness of the proposed process, we applied the process and tool chain to a small organization.

• The Journal of Engineering Geology
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• v.24 no.4
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• pp.583-595
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• 2014

The chemical properties and composition (pH, CaO, Fe, $HCO{_3}^-$, and $SO{_4}^{2-}$) of groundwater (GW) and surface water (SW) from the northern (non-carbonate bedrock) and southern (carbonate bedrock) sections of the Daedong River, Pyeongyang were analyzed and compared period of the 1930s. In the southern section, the GW and SW has a higher pH and $SO{_4}^{2-}$ concentration, but lower $HCO{_3}^-$ and Fe levels than in the north. This finding reflects a reaction that formed acid by replacing metal ions in inorganic salts by hydrogen, which resulted from the oxidation of organic material in a clay layer.

• Food Science and Preservation
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• v.8 no.4
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• pp.434-441
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• 2001

The purpose of this research is the establishment of optimal processing and the quality improvement of confectionary analysis of the damaged starch content of flour. I studied the rheological and bread making properties of the dough containing different damaged starch content. I examined rheological and physico- chemical characteristic farinograph, extensograph and amylograph with DNS, CWRS and SW containing 6.5%, 8.2%, 9.0%, 9.0% and 10.5% of damaged starch. And I measured the hardness and specific volume and performed the functional survey by rheometer for quality control. In the amylogram, at the damaged starch content 9.5% at such the maximum viscosity was 900 B.U. the volume of bread fermention tolerance were increased. In addition, the extensegram after 135 min showed that maximum resistance of the dough were 570 B.U at the damaged starch contents of 9.5% and the bread had homogeneous air cells and internal structures at the damaged starch contents of 9.5% at which the area(A), resistance(R) and R/E value of the dough were highest.

• ETRI Journal
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• v.38 no.6
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• pp.1064-1073
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• 2016

An adaptive speech streaming method to improve the perceived speech quality of a software-based multipoint control unit (SW-based MCU) over IP networks is proposed. First, the proposed method predicts whether the speech packet to be transmitted is lost. To this end, the proposed method learns the pattern of packet losses in the IP network, and then predicts the loss of the packet to be transmitted over that IP network. The proposed method classifies the speech signal into different classes of silence, unvoiced, speech onset, or voiced frame. Based on the results of packet loss prediction and speech classification, the proposed method determines the proper amount and bitrate of redundant speech data (RSD) that are sent with primary speech data (PSD) in order to assist the speech decoder to restore the speech signals of lost packets. Specifically, when a packet is predicted to be lost, the amount and bitrate of the RSD must be increased through a reduction in the bitrate of the PSD. The effectiveness of the proposed method for learning the packet loss pattern and assigning a different speech coding rate is then demonstrated using a support vector machine and adaptive multirate-narrowband, respectively. The results show that as compared with conventional methods that restore lost speech signals, the proposed method remarkably improves the perceived speech quality of an SW-based MCU under various packet loss conditions in an IP network.