• 대한공간정보학회지
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• 제17권4호
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• pp.3-11
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• 2009

최근 들어 다양한 분야에서 개방형 라이브러리가 개발되어 온라인상으로 배포되고 있으며, 사용자들은 이러한 오픈소스를 활용할 경우 최소한의 노력으로 요구되는 응용프로그램을 신속하게 개발할 수 있다. 그러나 배포되는 오픈소스를 활용하기 위해서는 사용목적에 맞게 커스터마이징 공정이 요구된다. 본 연구에서는 최근 국내에서 세계 측지계의 변환작업이 활발히 진행되는 상황에서 좌표계변환을 위해 개발된 오픈소스 Proj4를 기반으로 소프트웨어를 개발하고, 이를 국토지리정보원에서 개발한 NGI Pro 소프트웨어와 비교 평가하였다. 그 결과 약간의 변환과정 만으로 국내에서 활용 가능한 좌표변환모듈의 개발이 가능하였으며, 좌표계변환을 요구하는 분야 뿐 만 아니라 다양한 응용프로그램에 개방형 라이브러리를 활용하는 것이 효과적임을 알 수 있었다.

• 한국통신학회:학술대회논문집
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• 한국통신학회 2004년도 추계종합학술대회 논문 초록집
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• pp.229-229
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• 2004

• ETRI Journal
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• 제29권5호
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• pp.655-666
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• 2007

There are nodes and edges in a topological map. Node data has been used as a main source of information for the localization of mobile robots. In contrast, edge data is regarded as a minor source of information, and it has been used in an intuitive and heuristic way. However, edge data also can be used as a good source of information and provide a way to use edge data efficiently. For that purpose, we define a data format which describes the shape of an edge. This format is called local generalized Voronoi graph's angle (LGA). However, the LGA is constituted of too many samples; therefore, real time localization cannot be performed. To reduce the number of samples, we propose a compression method which utilizes wavelet transformation. This method abstracts the LGA by key factors using far fewer samples than the LGA. Experiments show that the LGA accurately describes the shape of the edges and that the key factors preserve most information of the LGA while reducing the number of samples.

• 한국IT서비스학회지
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• 제5권1호
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• pp.149-164
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• 2006

The companies are trying to apply to software development approach by utilizing open-source components. The open-source components are new alternatives to solve limits of the previous software developments such as quality of software, time and cost of development. Accordingly, various analysis of open-source components were performed. However, the researches about the detailed procedures and methods to utilize open-source components in practical industry are immature. In this paper, we propose the procedures and cases for identifying, validating, selecting of suitable open-source components and for applying to change and modification. Proposed procedures and cases will be a great contribution to spread of utilizing the open-source.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2007년도 추계 종합학술대회 논문집
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• pp.381-385
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• 2007

현재 270개 이상의 학회에 설치된 온라인논문투고관리시스템 KISTI-ACOMS는 개발 당시 예상에 비하여 훨씬 빠른 속도로 설치 학회 수가 늘어남으로 인하여 많은 양의 소스 코드를 관리하기가 점점 어려워지고 있다. 또한 이 프로그램의 본질적 특성상 빈번하게 학회에서 들어오는 수정 요구에 의한 소스 코드의 수정은 체계적인 프로그램 관리를 더욱 어렵게 한다. 이에 KISTI에서는 여러 학회의 서비스를 한 버전의 소스 코드로 통합 관리하는 체계를 고안하였으며 이 시스템의 개발로 유지/보수 측면에서 관리해야 할 소스 코드의 양이 대폭 줄어들 뿐 아니라 기존에 비하여 사용자들의 요구사항에 대하여 훨씬 능동적인 대처가 가능해질 것이다.

• Journal of Communications and Networks
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• 제11권6호
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• pp.589-598
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• 2009

In wireless sensor networks, a node that reports information gathered from adjacent assets should relay packets appropriately so that its location context is kept private, and thereby helping ensure the security of the assets that are being monitored. Unfortunately, existing routing methods that counter the local eavesdropping-based tracing deal with a single asset, and most of them suffer from the packet-delivery latency as they prefer to take a separate path of many hops for each packet being sent. In this paper, we propose a routing method, greedy perimeter stateless routing-based source-location privacy with crew size w (GSLP-w), that enhances location privacy of the packet-originating node (i.e., active source) in the presence of multiple assets. GSLP-w is a hybrid method, in which the next-hop node is chosen in one of four modes, namely greedy, random, perimeter, and retreat modes. Random forwarding brings the path diversity, while greedy forwarding refrains from taking an excessively long path and leads to convergence to the destination. Perimeter routing makes detours that avoid the nodes near assets so that they cannot be located by an adversary tracing up the route path. We study the performance of GSLP-w with respect to crew size w (the number of packets being sent per path) and the number of sources. GSLP-w is compared with phantom routing-single path (PR-SP), which is a notable routing method for source-location privacy and our simulation results show that improvements from the point of the ratio of safety period and delivery latency become significant as the number of source nodes increases.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2015년도 제51차 동계학술대회논문집 23권1호
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• pp.283-284
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• 2015

We can picture a workforce that extends beyond your employees: one that consists of any user connected to the Internet. Cloud, social, and collaboration technologies now allow organizations to tap into vast pools of resources across the world, many of whom are motivated to help. Channeling these efforts to drive business goals is a challenge, but the opportunity is enormous: it can give every business access to an immense, agile workforce that is not only better suited to solving some of the problems that organizations struggle with today but in many cases will do it for free. In this paper, we research on factors to design an organizational crowd source for Big Data.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2015년도 춘계학술대회
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• pp.212-214
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• 2015

디지털 제조가 새로운 패러다임을 열어가는 시점에서 이를 뒷받침 하기위한 오픈소스 하드웨어의 동향을 살펴보고자 한다. 디지털 제조의 등장 배경에 대하여 고찰해보고자, 아울러 이를 뒷받침 할 수 있는 정부의 정책에 대한 동향과 제언을 제시하고자 한다.

• 유통과학연구
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• 제14권11호
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• pp.117-128
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• 2016

Purpose - In order to collect information needed for the establishment of more effective marketing strategies of on-line purchasing agent services targeting Chinese consumers, the study investigated the relationship among Chinese selection criteria. They included fashion products, use of information source, and satisfaction with on-line purchasing agent services. The study also identified the differences in the Chinese selection criteria of fashion products, use of information source, and the satisfaction level with on-line purchasing agent services according to their age and gender. Research design, data, and methodology - The study was implemented through a normative-descriptive survey method using a self-administered questionnaire. Data were collected from February 9 to 28, 2016, and analyzed by factor analysis, ANOVA and Duncan test, t-test, and multiple regression analysis. Results - Differences were found in selection criteria of fashion products and use of information sources among groups. Thirty's age group was concerned about price/brand more than the twenty's were. Twenty's were concerned about practicality/quality of the products more than the thirty's. Hallyu/broadcasting was used by men more than by women as an information source of Korean fashion. SNS/WOM(word of mouth) was used more by women than by man. Twenty's showed lower level of satisfaction with customer services/credibility than other factors. The thirty's showed lower level of satisfaction with informational role of the service than other factors. Those who utilize each type of fashion information source more showed higher satisfaction level with on-line purchasing agent service of Korean fashion products.. In general, according to the selection criteria and use of information, there were differences in satisfaction with on-line purchasing agent service of Korean fashion products. Conclusions - Considering the findings of the study, as well as age, gender, selection criteria and use of information source, Chinese consumers could be used as a criteria of market segmentation for on-line purchasing agent services of Korean fashion products. The results manifested that there is a need to differentiate marketing strategies according to the satisfaction levels with each satisfaction factors of on-line purchasing agent service of Korean fashion products.

• Journal of Power Electronics
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• 제17권2호
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• pp.334-345
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• 2017

In order to meet the increasing needs of the hybrid energy source system for electric vehicles, which demand bidirectional power flow capability with a wide-voltage-conversion range, a bidirectional three-level DC-DC converter and some control strategies for hybrid energy source electric vehicles are proposed. The proposed topology is synthesized from Buck and Boost three-level DC-DC topologies with a high voltage-gain and non-extreme duty cycles, and the bidirectional operation principle is analyzed. In addition, the inductor current ripple can be effectively reduced within the permitted duty cycle range by the coordinated control between the current fluctuation reduction and the non-extreme duty cycles. Furthermore, benefitting from duty cycle disturbance control, series-connected capacitor voltages can also be well balanced, even with the discrepant rise and fall time of power switches and the somewhat unequal capacitances of series-connected capacitors. Finally, experiment results of the bidirectional operations are given to verify the validity and feasibility of the proposed converter and control strategies. It is shown to be suitable for hybrid energy source electric vehicles.