• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권2호
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• pp.846-864
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• 2017

Software Defined Network (SDN) realizes management and control over the underlying forwarding device, along with acquisition and analysis of network topology and flow characters through south bridge protocol. Data path Identification (DPID) is the unique identity for managing the underlying device, so forged DPID can be used to attack the link of underlying forwarding devices, as well as carry out DoS over the upper-level controller. This paper proposes a dynamic defense method based on Client-Puzzle model, in which the controller achieves dynamic management over requests from forwarding devices through generating questions with multi-level difficulty. This method can rapidly reduce network load, and at the same time separate attack flow from legal flow, enabling the controller to provide continuous service for legal visit. We conduct experiments on open-source SDN controllers like Fluid and Ryu, the result of which verifies feasibility of this defense method. The experimental result also shows that when cost of controller and forwarding device increases by about 2%-5%, the cost of attacker's CPU increases by near 90%, which greatly raises the attack difficulty for attackers.

• International Journal of Computer Science & Network Security
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• 제22권4호
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• pp.261-273
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• 2022

Over the last decade, the scientific community has been actively developing technologies for automated software bug fixes called Automated Program Repair (APR). Several APR techniques have recently been proposed to effectively address multiple classroom programming errors. However, little attention has been paid to the advances in effective APR techniques for software bugs that are widely occurring during the software life cycle maintenance phase. To further enhance the concept of software testing and debugging, we recommend an optimized automated software repair approach based on hybrid technology (OAPR-HOML'1). The first contribution of the proposed OAPR-HOML'1 technique is to introduce an improved grasshopper optimization (IGO) algorithm for fault location identification in the given test projects. Then, we illustrate an opposition learning based artificial neural network (OL-ANN) technique to select AST node-level transformation schemas to create the sketches which provide automated program repair for those faulty projects. Finally, the OAPR-HOML'1 is evaluated using Defects4J benchmark and the performance is compared with the modern technologies number of bugs fixed, accuracy, precession, recall and F-measure.

• 한국경영과학회지
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• 제18권3호
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• pp.129-149
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• 1993

The high level of activity in the development and maintenance of computer software makes the scheduling of software projects an importnat factor in reducing operating costs and increasing competitiveness. Software activity is labor intensive. Scheduling management of hours of software work is complicated by ther interdependencies between the segments of work, and the uncertainties of the work itself. This paper discusses issues of scheduling in software engineering management, and presents a modular decomposition model for software project scheduling, taking advantage of the facility for decomposition of a software project into relatively independent work segment modules. Modular decomposition makes it possible to treat scheduling as clustering and sequencing in the context of integer programming. A heuristic algorithm for the model is presented with some computational experiments.

• 한국소프트웨어감정평가학회 논문지
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• 제16권1호
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• pp.21-26
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• 2020

The completeness appraisal of software is performed in various forms, such as assessing the completion level in the development process, calculating the defect rate, estimating the development cost, and calculating the redevelopment cost. Along with this, the problem that is often dealt with is estimation of the development time. Even in a dispute over completeness due to delays in software development, issues of calculating an appropriate development time required to develop a delivery software or a development time required for change requests are often included in the appraisal request. In this paper, we introduce the procedure and method for estimating the appropriate project time of software development so that the appraiser can be applied to the appraisal work for determining the completeness. The method is based on the manual for calculating the appropriate project period of software development project.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 International Symposium on GPS/GNSS Vol.2
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• pp.211-215
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• 2006

In this paper, design and applications of a generalized, versatile and customizable IF signal generator that can model the modernized GPS and Galileo signal is given. It generates IF sampled data that can be directly used by a software receiver. Entire constellation of satellites which is independent of satellite-user geometry is easily determined using a real or simulated ephemeris data. Since the IF center frequency, sampling frequency and quantization bit number are user location dependent parameters, their effects are also considered in IF signal generator. The generalized IF signal generator will be very well suited for the development phase of a software receiver due to its versatility. The full access to the sampling frequency, front-end filter definition and ADC parameters also offers a great opportunity for cost-effective analysis of tracking loops and error mitigation techniques at the receiver level. Interference sources can be easily added to the generator to simulate specific environments. This software IF signal generator can also be used to feed a multi-frequency multi-system software receiver for the prototyping of a combined GPS/Galileo receiver. The test result using the generated signals and a real software receiver shows the effectiveness of the implemented IF signal generator.

• 한국인터넷방송통신학회논문지
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• 제21권2호
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• pp.79-88
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• 2021

과학용 소프트웨어는 전문가 수준의 깊이있는 도메인 지식 요구 등과 같이 고유한 특성들로 인하여 전통적인 응용소프트웨어와는 다른 개발 프로세스가 요구된다. 본 연구에서 우리는 과학용 소프트웨어 개발을 위하여 RE(Reverse Engineering)과 TDD(Test-Driven Development)에 기반한 V&V 개발 프로세스를 제안하였다. 또한 실제 프로젝트에 가상 시나리오를 구성하고 적용하여 절차를 검증하고 정교화 하였다. 과학용 소프트웨어 개발을 목적으로 제안된 본 연구의 개발 프로세스는 고품질, 고 신뢰성을 제공할 수 있는 소프트웨어 개발 및 적용에 기여할 것이다. 또한 본 연구는 과학용 소프트웨어 개발 및 연구의 저변 확산의 계기가 될 것으로 기대된다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1992년도 춘계학술대회 논문집
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• pp.301-305
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• 1992

A mold plant is characterized by complex processes, frequent schedule changes, and lots of troubles. In order to control the production in mold plant efficiently, huge amount of informations are to be managed in the appropriate way. In this paper, a modular software system for production control is described, which is located between a higher level production planning system and a process control system. It contains the functions such as order processing, operations scheduling and control, tool managemant, NC program managememt including DNC functions, production data acquisition and progress control and statistics.

• Journal of Advanced Marine Engineering and Technology
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• 제22권5호
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• pp.652-659
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• 1998

The present study is aimed to develop a new PIV operating software through optimization of vector tracking identification including versatile pre-processings and post-processing techniques. And the result exhibits an improved version corresponding various input and output multimedia compared to previous commercial software developed by other makers. An upgraded identification method called grey-level cross correlation coefficient method by direct calculation is suggested and related user-friendly pop-up menu are also represented. Post-processings comprising turbulence statistics are also introduced with graphic output functions.

• 한국정보통신학회논문지
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• 제23권5호
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• pp.508-515
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• 2019

소프트웨어 관련 R&D 사업의 결과의 성공여부를 판단하는 기준으로 다양한 정량지표를 많이 사용하고 있으나, 어떠한 정량지표를 선정하는 것이 적절한지에 대한 판단은 다소 어려운 부분이 있다. 본 논문에서는 소프트웨어 개발의 정량적 평가지표 선정에 기준을 제공하기 위해 소프트웨어 품질 수준의 표준으로 활용되고 있는 ISO/IEC25023를 활용하여 소프트웨어 제품 개발의 정량적 평가지표 생성프로세스를 제안한다. 제안 프로세스는 2단계로 구성되어 있다. 첫 번째 단계에서는 ISO/IEC25023 표준규격의 품질특성과 부특성을 도출하고, 두 번째 단계에서는 1단계 결과인 품질특성과 부특성에 부합하는 평가지표 가이드를 도출한다. 제안하는 정량적 평가지표 생성 프로세스는 소프트웨어 개발 프로젝트의 특성에 맞는 정량적 평가지표 선정에 도움이 될 것으로 기대한다.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2011년도 한국컴퓨터종합학술대회논문집 Vol.38 No.1(B)
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• pp.136-139
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• 2011

SW 품질비용은 좋은 품질의 소프트웨어를 만들기 위한 경제적 상충관계(trade-off)를 이해하는데 도움을 주는 유용한 도구이다. 일반적으로 제조업 분야에서 많이 활용되고 있는 품질비용을 소프트웨어 분야에 적용하는 것은 SW품질을 높이는 좋은 방안이지만 불행하게도 이제까지 별로 관심을 받지 못했다. 본 논문에서는 SW품질을 활용하기 위한 판단근거(rationale)와 구성요소를 살펴보고, 국내 SW개발 프로젝트를 대상으로 수집된 자료를 바탕으로 국내 SW개발 프로젝트의 품질비용구조를 살펴보고, SW공학수준에 따른 품질비용의 차이를 통계기법을 통해 살펴보았다. 분석결과, SW공학수준에 따라 투입되는 품질비용의 차이가 있고, 공학수준이 높을수록 적게 투입되는 것으로 나타나고 있다.