• ETRI Journal
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• 제31권3호
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• pp.304-314
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• 2009

Component-based software reuse has been generally regarded as a promising approach to improving software productivity and quality within software development. However, progress in component-based software reuse has been slower than expected. Much of the software reuse literature points to the lack of software components that can maximize users' benefits as the most important source of the slow progress. Considering that the underlying processes behind component-based software reuse are strikingly similar to commercial software marketing, this paper attempts to identify the aspects of software components that consumers value and to establish relationships between the identified aspects and consumer behavior in the software component market. More specifically, this paper focuses on the perceived subjective features of software components. This study was conducted in a web-based artificial market environment called "SofTrade."

• 인터넷정보학회논문지
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• 제20권6호
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• pp.37-46
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• 2019

A test plan is a high level document detailing objectives, processes, schedules and so on for verifying a developed software. And a test strategy, a component of a test plan, is about how to test software products to guarantee its quality and find bugs in the software in advance. Therefore, establishing effective and suitable test strategies is important for elaborating test processes. However, these tasks are difficult for project managers who write a test plan if they were not trained well in software test processes. And mis-designed test strategies will also mislead entire testing behaviors that testers would do. As a result, there would be a low quality software product in the end. To solve this problem, we propose a new test strategy reuse technique in this paper. By utilizing test plans of already completed software development projects, we lead test planer to reuse suitable and effective test strategies which were used in previous projects. To do so, we evaluate existing test strategies by utilizing ISO/IEC 25010 quality model for evaluating the suitability of test strategies and also use effectiveness metrics for test strategies. And from these evaluations, we predict completeness of new test plan that is written by reused test strategies. It can help the project manager to write an appropriate test plan for the quality characteristics which are selected as objectives for testing and software product. We show the possibility of our approach by implementing a prototype into the existing framework in a case study.

• 정보처리학회논문지:소프트웨어 및 데이터공학
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• 제4권3호
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• pp.111-120
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• 2015

최근 동적인 환경에서 발생하는 다양한 문제를 스스로 해결할 수 있는 자가 적응 시스템에 대한 연구가 활발히 이루어지고 있다. 자가 적응 시스템에서 시스템이 문제를 스스로 인식하고 자가 적응할 수 있도록 요구사항을 설계하는 과정은 필수적이며, 만약 기존의 적응 전략들을 재사용하여 자가 적응 시스템을 설계한다면 소요되는 시간 및 비용을 절감할 수 있다. 따라서 이 논문은 새로운 자가 적응 시스템 개발 시 기존의 자가 적응 시스템으로부터 재사용 가능한 적응 전략을 추출하는 시스템을 제안한다. 이를 위하여 자가 적응 요소를 지식화하여 적응 전략 온톨로지 및 타깃 시스템 온톨로지를 정의하고, 이러한 온톨로지를 기반으로 재사용 가능한 적응 전략을 추출하는 기법을 기술한다. 또한, 이 논문은 제안 시스템을 구현하고 추출된 적응 전략에 대한 재사용률을 측정함으로써 제안 시스템을 비교 평가한다. 평가 결과, 제안 시스템은 추출된 적응 전략이 정확히 동작함을 보이며 제안 시스템의 추출 기법은 기존의 재사용 기법보다 높은 재사용률을 보인다.

• Journal of Communications and Networks
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• 제10권2호
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• pp.127-136
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• 2008

For mobile wireless systems with full frequency reuse, co-channel interference near the cell coverage boundaries has a significant impact on the signal reception performance. This paper addresses an approach to efficiently mitigate the effect of downlink co-channel interference when multi-antenna terminals are used in cellular environments, by proposing a signal detection strategy combined with a system-level coordination for dynamic frequency reuse. We demonstrate the utilization of multi-antennas to perform spatial demultiplexing of both the desired signal and interfering signals from adjacent cells results in significant improvement of spectral efficiency compared to the maximal ratio combining (MRC) performance, especially when an appropriate frequency reuse based on the traffic loading condition is coordinated among cells. Both analytic expressions for the capacity and experimental results using the adaptive modulation and coding (AMC) are used to confirm the performance gain. The robustness of the proposed scheme against varying operational conditions such as the channel estimation error and shadowing effects are also verified by simulation results.

• Journal of Information Science Theory and Practice
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• 제3권1호
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• pp.24-39
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• 2015

Pre-retrieval query formulation is an important step for identifying local text reuse. Local reuse with high obfuscation, paraphrasing, and translation poses a challenge of finding the reused text in a document. In this paper, three pre-retrieval query formulation strategies for heuristic retrieval in case of low obfuscated, high obfuscated, and translated text are studied. The strategies used are (a) Query formulation using proper nouns; (b) Query formulation using unique words (Hapax); and (c) Query formulation using most frequent words. Whereas in case of low and high obfuscation and simulated paraphrasing, keywords with Hapax proved to be slightly more efficient, initial results indicate that the simple strategy of query formulation using proper nouns gives promising results and may prove better in reducing the size of the corpus for post processing, for identifying local text reuse in case of obfuscated and translated text reuse.

• 한국통신학회논문지
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• 제37A권12호
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• pp.1093-1105
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• 2012

본 논문에서는 3-Cell 간섭 환경에서의 하향링크 MU-MIMO를 위한 간섭 공간 재활용 기술 (ISR)과 그 적용방안을 제시한다. 멀티 셀 간섭환경의 셀 경계 사용자들의 안정적인 통신을 위해서는 효율적인 간섭 관리가 필요하다. 하지만 셀 중심부의 사용자들의 경우 간섭의 영향을 적게 받으며 적은 전송 전력으로도 안정적인 통신이 가능하다. 본 논문에서는 셀 경계 사용자의 간섭 공간을 재사용하여 셀 중심부 사용자에게 서비스를 제공하는 ISR 기반 전송 신호 설계 방법을 제시한다. ISR 방식은 간섭정렬(IA)과 결합된 부분적 주파수 재활용 (fractional frequency reuse : FFR) 방식과 비교하여 볼 때 셀 중심 사용자와 셀 경계 사용자에 대한 scheduling에 따라 전체 네트워크 데이터 전송용량 측면에서 20%의 성능 향상을 보이며 또한 셀 중심 사용자의 서비스 품질 (QoS) 요구조건이 고정되어 있는 경우 ISR 방식에 의해 기지국에서의 전송 신호 벡터를 설계함으로서 셀 경계 사용자의 데이터 전송 용량을 증가시킬 수 있다.

• 한국컴퓨터정보학회논문지
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• 제25권9호
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• pp.183-191
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• 2020

IT 발달과 함께 스마트기기로 많은 학습자가 이러닝 콘텐츠를 접하고 있으며, 콘텐츠 제공자들은 학습자의 재이용 의도와 행동을 주의 깊게 관찰하고 있다. 따라서 본 연구에서는 스마트폰에 기반한 이러닝 학습을 접해본 200명의 사용자를 대상으로 이러닝 콘텐츠 플랫폼 특성이 재이용 의도에 미치는 영향을 연구하였다. 그 결과, 사용자의 재이용 의도에 영향을 미치는 특성은 콘텐츠 품질, 상호작용성, 편재성으로 나타났다. 또한, 남성일 경우 재이용 의도에 영향을 미치는 가장 큰 특성은 상호작용성이며, 여성일 경우 콘텐츠 품질과 편재성이었다. 스마트폰을 이용해 하루 평균 한 시간 미만 이러닝을 학습할 경우 콘텐츠 품질이 재이용 의도에 가장 큰 영향을 주었으며, 반대로 한 시간 이상 학습할 경우 편재성, 편리성, 상호작용성이 재이용 의도에 영향을 주었다. 아직도 많은 이러닝 기업들이 PC 기반의 기술이나 단기적 홍보 중심의 사업 전략을 유지해오고 있는데, 본 연구의 결과는 앞으로 해당 기업들이 장기적 사업 전략의 관점에서 스마트폰 기반의 플랫폼 변화와 그 핵심 요인들에 대한 방향을 제시했다는 데 의의를 둘 수 있다.

• Journal of Information Technology Applications and Management
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• 제17권2호
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• pp.71-90
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• 2010

Electronic learning(or e-learning) has created hype for companies, universities, and other educational institutions. It has led to the phenomenal growth in the use of web-based learning and experimentation with multimedia, video conferencing, and internet-based technologies. Many researchers are interested in the factors that affect to the performance of e-learning or e-learning services. In this sense, this study is aimed at proposing e-learning system reuse prediction models in which e-learner intention to reuse influence factors(i.e., system accessibility, system stability, information clarity, information validity, self-regulated efficacy, computer self-efficacy, perceived usefulness, perceived ease of use, flow, and parental expectation) affect e-learner intention to reuse positively. A web survey was conducted for the full members of the e-learning education institute A in Seoul, Republic of Korea, an exclusive e-learning company that provides real time video lectures via the desktop conferencing system. The web survey was conducted for 20 days from November 5, 2009, through the e-learning web site of the company A. In this study, three data mining techniques were used : the multivariate discriminant analysis, CART, and C5.0 algorithm. This study was conducted to provide the e-learning service providers, e-learning operators, and contents developers with marketing and management strategies for improving the e-learning service companies, based on the data mining analysis results.

• 한국정보시스템학회지:정보시스템연구
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• 제30권3호
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• pp.1-20
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• 2021

Purpose Live streaming commerce refers to the fact that people receive live audio and live video directly over the net. While some e-retailers use Live Streaming as a marketing strategy, the impact of live streaming commerce on customers' reuse intentions is unknown. The purpose of this study is to discuss the impact of live streaming commerce by external environmental factors based on S-O-R theory. Design/methodology/approach In this study, we developed a research model based on the S-O-R theory. Using the questionnaire survey method, consumers who used live streaming commerce on Taobao.com were taken as research subjects. Our research model aims to find out how content attributes, real-time interactions, media characteristics, and situational characteristics as stimulus factors influence consumers' perceptions and thus reuse intentions. Findings The results of the analysis show that external environmental factors have a significant impact on consumer perceptions and that perceived risks and flows can influence consumers' reuse intentions. In addition, we also examined the impact of reuse intentions on consumers' active participation. These results show that live streaming commerce can influence consumer perceptions and behavior in several ways.

• International Journal of Computer Science & Network Security
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• 제22권4호
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• pp.292-298
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• 2022

Femtocell networks can be a potential method for increasing the capacity of LTE networks, especially in indoor areas. However, unplanned deployment of femtocells results in co-tier interference and cross-tier interference problems. The interference reduces the advantages of implementing femtocell networks to a certain extent. The notion of Fractional Frequency Reuse (FFR) is proposed in order to reduce the impact of interference on the system's performance. In this paper, a dynamic approach for efficiently partitioning the spectrum is suggested. The goal is to enhance the capacity of femtocells, which will improve the performance of the system. The suggested strategy allocates less resources to the macrocell portion of the network, which has a greater number of femtocells deployed to maximize the utilization of available resources for femtocell users. The spectrum division would be dynamic. The proposed strategy is evaluated through a simulation using MATLAB tool. In conclusion, the results showed that the proposed scheme has the potential to boost the system's capacity.