• Journal of Intelligence and Information Systems
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• v.20 no.4
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• pp.1-23
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• 2014

Market forecasting aims to estimate the sales volume of a product or service that is sold to consumers for a specific selling period. From the perspective of the enterprise, accurate market forecasting assists in determining the timing of new product introduction, product design, and establishing production plans and marketing strategies that enable a more efficient decision-making process. Moreover, accurate market forecasting enables governments to efficiently establish a national budget organization. This study aims to generate a market growth curve for ICT (information and communication technology) goods using past time series data; categorize products showing similar growth patterns; understand markets in the industry; and forecast the future outlook of such products. This study suggests the useful and meaningful process (or methodology) to identify the market growth pattern with quantitative growth model and data mining algorithm. The study employs the following methodology. At the first stage, past time series data are collected based on the target products or services of categorized industry. The data, such as the volume of sales and domestic consumption for a specific product or service, are collected from the relevant government ministry, the National Statistical Office, and other relevant government organizations. For collected data that may not be analyzed due to the lack of past data and the alteration of code names, data pre-processing work should be performed. At the second stage of this process, an optimal model for market forecasting should be selected. This model can be varied on the basis of the characteristics of each categorized industry. As this study is focused on the ICT industry, which has more frequent new technology appearances resulting in changes of the market structure, Logistic model, Gompertz model, and Bass model are selected. A hybrid model that combines different models can also be considered. The hybrid model considered for use in this study analyzes the size of the market potential through the Logistic and Gompertz models, and then the figures are used for the Bass model. The third stage of this process is to evaluate which model most accurately explains the data. In order to do this, the parameter should be estimated on the basis of the collected past time series data to generate the models' predictive value and calculate the root-mean squared error (RMSE). The model that shows the lowest average RMSE value for every product type is considered as the best model. At the fourth stage of this process, based on the estimated parameter value generated by the best model, a market growth pattern map is constructed with self-organizing map algorithm. A self-organizing map is learning with market pattern parameters for all products or services as input data, and the products or services are organized into an $N{\times}N$ map. The number of clusters increase from 2 to M, depending on the characteristics of the nodes on the map. The clusters are divided into zones, and the clusters with the ability to provide the most meaningful explanation are selected. Based on the final selection of clusters, the boundaries between the nodes are selected and, ultimately, the market growth pattern map is completed. The last step is to determine the final characteristics of the clusters as well as the market growth curve. The average of the market growth pattern parameters in the clusters is taken to be a representative figure. Using this figure, a growth curve is drawn for each cluster, and their characteristics are analyzed. Also, taking into consideration the product types in each cluster, their characteristics can be qualitatively generated. We expect that the process and system that this paper suggests can be used as a tool for forecasting demand in the ICT and other industries.

• Journal of Digital Contents Society
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• v.1 no.1
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• pp.65-75
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• 2000

The 7th National Curriculum Guidelines strongly suggest the use of ICT for schools, and one of the best way to integrate ICT could be the implementation of Integrated Learning Systems (ILS). ILS is known to be a comprehensive system for learning that offer variety of multimedia contents and activities, textbooks, and networked systems. It is a comprehensive package for instruction and loaming tailored to fit specific curriculum. Thus, ILS is well-integrated and well-suited to individual learners' interest or capabilities. The school teachers who would have to use ICT in their courses required by the 7th National Curriculum Guidelines, ILS could be an innovative tool to be effective not only in teaching but also in using ICT. However, effective use and development of ILS, in Korea, should be supported by the educational decision makers and policies to fit Korean school curriculum. Thus, in this paper, we have studies to look at examplary ILS and a couple of cases to consider ILS for possible adoption in Korea.

• Korean Business Review
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• v.12
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• pp.303-321
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• 1999

Electronic commerce, driven by the development of the Internet and computer, premises to be an important engine for growth for the world economy in th the 21st century. Electronic commerce offers considerable new opportunities for the business and citizens in all regions of the world by enhancing productivity across of our economics and encourage trade in both goods and services. Specially in relation to contract, electronic commerce requires a coherent, coordinated approach internationally on key issues such as a validity, a legality, consumer protection. Electronic commerce, which breaks down national boundaries and widens the gap between the place where services are performed and the place where they are consumed, requires a new paradigm when making an between contracting parties.

• Convergence Security Journal
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• v.4 no.2
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• pp.27-34
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• 2004

The recent explosive use of the Internet and the development of computer communication technologies reveal serious computer security problem. Inspite of many studies on secure access to the system, generally, the attackers do not use the previous intrusion techniques or network flaw, rather they tend to use the vulnerabilities residing inside the program, which are the running programs on the system or the processes for the service. Therefore, the security managers must focus on updating the programs with lots of time and efforts. Developers also need to patch continuously to update the Program, which is a lot of burden for them. In order to solve the problem, we need to understand the vulnerabilities in the program, which has been studied for some time. And also we need to analyze the functions that contains some vulnerabilities inside. In this paper, we first analyzed the vulnerabilities of the standard C library, and Win32 API functions used in various programs. And then we described the design and implementation of the automated scanning tool for writing secure source code based on the analysis.

• Transactions of the KSME C: Technology and Education
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• v.4 no.2
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• pp.111-116
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• 2016

Consumer's value based content and business platform are more important than the existing supplier based market. Convergence civilization paradigm is being accelerated with expanded combination of information & communication technology and others. In this study, it was classified into four groups with respect to the level and viewpoints of innovation in products and services, which were already supplied on the market by industry convergence activity. Barriers that are obstacles to the development of a new converged industry through strategic approaches were identified by surveying the current industrial status. In detail, they were summarized with respect to three aspects, such as, target, infrastructure and main agent of individual sector. Finally, it presents an alternative to overcome the obstacles and develop a new growth engines for the future industrial evolution.

• Journal of Broadcast Engineering
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• v.16 no.6
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• pp.977-985
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• 2011

Recent works on multiuser transmission techniques have shown that the linear growth of capacity in single user MIMO system can be translated to the multiuser MIMO scenario as well. In this paper, we propose a method pursuing performance gain of vector perturbation in multiuser downlink systems. Instead of employing maximum number of mobile users for communication, we use small part of them as virtual users for improving reliability of users participating communication. By controlling parameters of virtual users including information and perturbation vector, we obtain considerable improvement in the effective SNR, resulting in large gain in bit error rate performance. Simulation results on the realistic multiuser downlink systems show that the proposed method brings substantial performance gain over the standard vector perturbation with marginal overhead in computations.

• Journal of Korea Multimedia Society
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• v.14 no.2
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• pp.238-248
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• 2011

Various services through mobile have been expanding since the development of the Smartphones. People freely communicate, remake and redistribute the information through Wi-Fi. People's freedom can cause lots of problems. There are application licenses of various types in the Android platform. However, problems about redistribution are indiscriminately distributed what can't be disentangled commercial and noncommercial use. To solve these problems, an application program has to go through procedures of license check in the Android platform. This method has two problems. One, an exact license authentication is impossible in the place where Wi-Fi does not work. The other thing, this license information is stored directly into the Smartphone. Therefore, attacks are possible about the stored license information, To solve these problems, we designed and implemented the file structure for storing the license information into USIM. We can store and authenticate them. Thus, we propose above the authentication method that can be authenticated the license authentication safely in on or off-line.

• Proceedings of the Korea Technology Innovation Society Conference
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• 1998.05a
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• pp.24-24
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• 1998

국내 소프트웨어산업은 산업특성상 우리 나라에 적합한 산업이며 국내시장 규모도 급증하고 있으나 선진국에 비해 낙후되어 있는 형편이다. 따라서 최근 각광 받고 있는 소프트웨어 창업기업들을 대상으로 실사 및 설문지 조사를 통해 소프트웨어산업에 있어서의 성공요인들을 알아보고 이를 바탕으로 국내 소프트웨어산업의 국제경쟁력 제고를 위한 방안을 모색하는 것이 무엇보다도 필요한 시점이다. 이러한 본 연구의 목적을 달성하기 위해 조사대상 기업체를 기존 연구들처럼 소프트웨어산업에 종사하고 있는 기업들을 임의적으로 추출하여 자료를 수집하는 대신 성장 가능성이 있다고 판단되어 선정된 유‘망 중소정보통신 소프트웨어 기업’들과 현재까지 선정되지 못한 기업의 두 그룹으로 나누어 자료를 수집하였다. 수집된 자료를 바탕으로 두 그룹간의 창업배경 및 성장과정별로 비교분석을 통해 차이점을 밝히고자 하였으며 창업이후 성공적 운영에 필수적인 우위요인에 관해서도 살펴보았다. 이러한 비교분석결과에 근거하여 국내 소프트웨어산업의 성공요인 및 국제경쟁력 제고를 위한 방향을 제시하고자 하였다. 선정기업과 비선정기업간의 비교를 통한 성공요인 분석결과를 요약하여 살펴보면 다음과 같다. 첫째, 창업자의 일반적 특성과 창업배경 및 창업동기를 볼 때, 창업배경 또한 연구개발직 경험을 바탕으로 창업한 경우가 가장 많았으며, 주된 창업동기는 기술력에 바탕을 둔 사업화/동업화였다. 둘째, 창업자의 경영의지를 보면 창업 이전 준비 및 계획에 철저했으며, 각종 지원제도를 적극적으로 활용했을 뿐만 아니라 비혜택 제도도 적극적 활용(예; 공고생 현장실습제도 활용정도, 기술지도 및 연수사업 활용정도 등)하였으며, 특히 창업자가 미래에 대한 확신과 긍정적 사고, 및 성공에 대한 의지가 높았다. 셋째, 기술력을 보면 자체연구소 보유비율이 월등히 높으면, 보유기술도 국내에서 가장 먼저 개발하는 단계였거나 독자적인 기술보유가 많았고, 기술력 유지를 위한 신기술 연구개발투자의 강화, 신제품개발 및 품질향상을 지속화, 및 이를 뒷받침하기 위한 전문기술인력의 확보에 주력하였다. 끝으로 마케팅 능력면에서도 개발된 신제품에 대해 자체상표를 부착하는 비율(84.6% 대 64.5%)이 높고 다양한 판매경로를 통해 제품을 판매하였으며, 기업 및 제품이미지 제고를 위한 고객에 대한 서비스도 강화하고 있었다.

• The Journal of the Korea Contents Association
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• v.8 no.6
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• pp.54-65
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• 2008

When DDoS attack is achieved, malicious host discovering is more difficult on wireless network than existing wired network environment. Specially, because wireless network is weak on wireless user authentication attack and packet spoofing attack, advanced technology should be studied in reply. Integrated Access Device (IAD) that support VoIP communication facility etc with wireless routing function recently is developed and is distributed widely. IAD is alternating facility that is offered in existent AP. Therefore, advanced traffic classification function and real time attack detection function should be offered in IAD on wireless network environment. System that is presented in this research collects client information of wireless network that connect to IAD using AirSensor. And proposed mechanism also offers function that collects the wireless client's attack packet to monitoring its legality. Also the proposed mechanism classifies and detect the attack packet with W-TMS system that was received to IAD. As a result, it was possible for us to use IAD on wireless network service stably.

• Journal of Broadcast Engineering
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• v.14 no.2
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• pp.127-133
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• 2009

With advances in video technology, many researchers are interested in video quality assessment to prove better performance of proposed algorithms. Since human visual system is too complex to be formulated exactly, many researches about video quality assessment are in progressing. No-reference video-quality assessment is suitable for various video streaming services, because of no requested additional data and network capacity to perform quality assessment. In this paper, we propose a novel no-reference video-quality assessment method with the estimation of dynamic range distortion. To measure the performance, we obtain mean opinion score (MOS) data by subject video quality test with the ITU-T P.910 Absolute Category Rating (ACR) method. And, we compare it with proposed algorithm using 363 video sequences. Experimental results show that the proposed algorithm has a higher correlation with obtained MOS.