• 지식경영연구
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• 제11권2호
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• pp.133-152
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• 2010

This paper suggests a typology of the modes of collaboration for scientific and technological knowledge production and sharing (STKPS) based on knowledge communication types, including organizational factors, communication channel, intensity, and decision-making, that affect STKPS processes. It is mainly designed to rearrange ideas about collaboration drawn from the literature in order to develop a conceptual framework for categorizing modes of collaboration based on how communication patterns shape four modes of collaboration. In the conclusion and discussion part, practical implications, limitations of this study, and further studies are discussed. In particular, the practical implications propose communication patterns suitable for five stages of collaboration processes. As the collaboration initiation or set-up stage is critical, extensive face-to-face communication is recommended in the auditing stage. In the execution stage, media-based communication can be actively utilized, because collaborators will mostly exchange explicit codified knowledge supported by IT. The evaluation and reinforcement stages concentrate on tacit knowledge exchange and explicit knowledge evaluation, which requires intensive face-to-face communication including negotiations for evaluating collaboration outcomes and partnership.

• 한국시뮬레이션학회:학술대회논문집
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• 한국시뮬레이션학회 2001년도 The Seoul International Simulation Conference
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• pp.99-102
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• 2001

We propose a PC cluster using general-purpose microprocessors and a high-speed network for simulating ANN (Artificial Neural Network) processes on Linux OS. We apply this cluster to intelligent information processing such as ANN simulation. The elapsed time for simulating ANNs can be reduced from 7,295 seconds by a PE (Processing Element) to 1,226 seconds by six PEs. The reliability of a pattern-classification using ANNs can be improved by the proposed ANN, Randomized-ANN. In order to generate a Randomized-ANN, we choose three ANNs and combine the output results from three huts by means of logical AND. Results are as follows: The mean correct answer rate is 94.4%, the mean wrong answer rate is only 0.1 %, and the mean unknown answer rate is 5.5 %. We make sure that Randomized-ANN approach reduces the mean wrong answer rate within a tenth part and improves the reliability of Japanese coin classification.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권7호
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• pp.3511-3532
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• 2019

Coverage-guided fuzzing is an efficient solution that has been widely used in software testing. By guiding fuzzers through the coverage information, seeds that generate new paths will be retained to continually increase the coverage. However, we observed that most samples follow the same few high-frequency paths. The seeds that exercise a high-frequency path are saved for the subsequent mutation process until the user terminates the test process, which directly affects the efficiency with which the low-frequency paths are tested. In this paper, we propose a fuzzing solution, ER-Fuzz, that truncates the recording of a high-frequency path to influence coverage. It utilizes a deep learning-based classifier to locate the high and low-frequency path transfer points; then, it instruments at the transfer position to promote the probability low-frequency transfer paths while eliminating subsequent variations of the high-frequency path seeds. We implemented a prototype of ER-Fuzz based on the popular fuzzer AFL and evaluated it on several applications. The experimental results show that ER-Fuzz improves the coverage of the original AFL method to different degrees. In terms of the number of crash discoveries, in the best case, ER-Fuzz found 115% more unique crashes than did AFL. In total, seven new bugs were found and new CVEs were assigned.

• Journal of Communications and Networks
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• 제13권5호
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• pp.472-480
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• 2011

In this paper, we investigate two new candidate transmission schemes, non-orthogonal frequency reuse (NOFR) and beam-hopping (BH). They operate in different domains (frequency and time/space, respectively), and we want to know which domain shows overall best performance. We propose a novel formulation of the signal-to-interference plus noise ratio (SINR) which allows us to prove the frequency/time duality of these schemes. Further, we propose two novel capacity optimization approaches assuming per-beam SINR constraints in order to use the satellite resources (e.g., power and bandwidth) more efficiently. Moreover, we develop a general methodology to include technological constraints due to realistic implementations, and obtain the main factors that prevent the two technologies dual of each other in practice, and formulate the technological gap between them. The Shannon capacity (upper bound) and current state-of-the-art coding and modulations are analyzed in order to quantify the gap and to evaluate the performance of the two candidate schemes. Simulation results show significant improvements in terms of power gain, spectral efficiency and traffic matching ratio when comparing with conventional systems, which are designed based on uniform bandwidth and power allocation. The results also show that BH system turns out to show a less complex design and performs better than NOFR system specially for non-real time services.

• 디지털융복합연구
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• 제14권5호
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• pp.107-116
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• 2016

본 연구는 우리나라 정부가 창조경제 및 산업개혁 정책을 추진하면서 창의적이고 선도적인 경제 체질로의 탈바꿈을 시도함에 따라 이에 맞는 혁신시스템을 제안하고자 수행하였다. 이에 대표적인 지식 산업이라고 할 수 있는 우리나라 정보통신 분야 혁신시스템의 협력 네트워크 요인이 기술 혁신에 미치는 영향을 알아보았다. 본 연구를 위해 한국기업혁신조사(KIS) 데이터를 사용하였고, OECD NESTI-WPIA 방법론을 준용하여 프로빗 분석을 실시하였다. 이에 분석을 통해 다음의 연구 결과를 도출하였다. 첫째, 정보통신업에서 혁신 주체 간 협력은 대체적으로 기술혁신에 긍정적인 영향을 미친다. 둘째, 민간기관과의 협력이 기술 혁신에 중요한 역할을 미친다. 셋째, 다양한 협력은 혁신에 긍정적인 영향을 미치며, 창의성 수준이 낮은 활용적 혁신에 보다 큰 영향을 미친다. 이 결과를 통해 향후, 우리나라 기술혁신 정책이 협력촉진, 민간중심의 기술혁신, 다양한 의견을 수립할 수 있는 조합주의형 시스템 구축 등의 방향으로 나아가야 할 것으로 보인다.

• 기술혁신연구
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• 제26권2호
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• pp.1-36
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• 2018

본 연구에서 우리는 국가문화의 기술혁신활동에의 영향을 탐색해 보았다. 먼저 (국가)문화의 개념을 정리하였고, 다양한 세부 국가문화지표들에 대한 논의도 추가하였다. 다음으로 국가문화가 기술혁신 활동 및 성과에 영향을 미치는 이론적 메커니즘을 기존 문헌을 통하여 정리하였다. 국가문화는 국가 사회를 구성하는 근저를 이루는 틀을 형성하는 다양한 개념을 종합한 것이기 때문에 각 개념별로 기술혁신시스템에 미치는 영향은 크게 다름을 알 수 있었다. 마지막으로 국가문화가 기술의 특성, 사회제도, 정책 등과 어떻게 상호작용을 하면서 기술혁신활동에 영향을 미치는 지를 탐색해 보았다. 관련 문헌, 이론 및 실증분석을 정리하면서 동시에 이에 기반 하여 새로운 논의를 제안하고 다양한 미래연구 가능성을 제시하였다. 이를 통한 기술혁신이론에의 시사점도 정리하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권7호
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• pp.3747-3765
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• 2017

Existing authentication mechanisms in cellular mobile communication networks are realized in the upper layer by employing cryptographic techniques. Authentication data are broadcasted over the air in plaintext, enabling attackers to completely eavesdrop on the authentication and get some information about the shared secret key between legitimate nodes. Therefore, reusing the same secret key to authenticate several times results in the secret key's information leakage and high attacking rate. In this paper, we consider the most representative authentication mechanism, Authentication and Key Agreement (AKA), in cellular communication networks and propose an enhanced AKA scheme based on Physical Layer Authentication (AKA-PLA). Authentication responses generated by AKA are no longer transmitted in plaintext but masked by wireless channel characteristics, which are not available to adversaries, to generate physical layer authentication responses by a fault-tolerant hash method. The authenticator sets the threshold according to the authentication requirement and channel condition, further verifies the identity of the requester based on the matching result of the physical layer authentication responses. The performance analyses show that the proposed scheme can achieve lower false alarm rate and missing rate, which are a pair of contradictions, than traditional AKA. Besides, it is well compatible with AKA.

• 한국학교수학회논문집
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• 제16권4호
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• pp.675-694
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• 2013

본 연구의 목적은 교구 및 공학도구를 활용한 수학적 과정중심의 평가에 대한 교사들의 인식 및 평가 현황을 파악하고 교구 및 공학도구를 활용한 바람직한 수학적 과정 평가의 방향을 제시하는 것이다. 이를 위하여 수학 교과의 교수-학습 과정에서 교구 및 공학도구를 활용한 경험이 있는 서울, 경기 지역의 초 중등학교 수학교사 332명을 대상으로 설문조사를 실시하였다. 본 연구 결과, 수학적 과정중심 평가에 교구나 공학도구의 활용을 허용할 경우 교사들은 연구보고서, 프로젝트, 토론법 등의 다양한 대안 평가 방법을 보다 적극적으로 활용할 것으로 나타났다. 교구나 공학도구를 활용한 수학적 과정중심 평가 방법은 학생들의 학습상태를 보다 정확하고 종합적으로 파악하는데 기여할 수 있고, 동시에 수학적 과정을 강조한 교사의 수업 방법과 교수 활동의 개선을 위한 다양한 자료를 제공할 수 있다는 면에서 현장에서 대안적 평가 방법이 될 수 있다.

• 한국컴퓨터정보학회논문지
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• 제23권12호
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• pp.211-218
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• 2018

In this paper, we propose that investigating the relationship between the dynamic capacity and the technological innovation performance of firms. Based on the previous research, we divide the dynamic capacity into the adaptive capacity, absorption capacity, and productive capacity. Among the 3,400 companies responding to the technical statistics of SMEs in 2011, we performed multiple regression analysis with 2,807 except service industries. As a result, the absorptive capacity and productive capacity have a positive effect on the technological innovation performance at the 99% level, whereas the adaptive capacity has a negative effect on the technological innovation performance at the 95% level. The implications of this study are as follows. First, in order to improve the performance of technological innovation, it is important to strengthen the absorption capacity and productive capacity of companies. Absorption capacity shows that it is important to secure sufficient R & D manpower and R & D cost to utilize internal knowledge as well as to bring outside knowledge into the capacity to assimilate and utilize external knowledge. Second, the ability to commercialize a product is a capability to commercialize a technology that has succeeded in development, showing that the technology development organization must have the capability of post-development commercialization as well as technology development. Finally it shows the negative effect on adaptation capacity and innovation performance. Companies actively utilize external sources of information in order to respond to and adapt to the rapidly changing business environment. However, the results of this study show that a strategic approach is needed to use external sources of information and technology development resources. Especially as the use of external information resources and technology development resources increases.

• 대한산업공학회지
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• 제40권5호
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• pp.442-450
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• 2014

Technology opportunity discovery (TOD) based on technological capability is a process which identifies new product and technology items that can be developed by utilizing or improving a firm's existing products or technologies. By taking into consideration the investment risk of R&D and its practicality, developing technological capability-based TOD methodology is considered to be important for both business and research. To this end, we propose a technological capability-based TOD method and its system using TOD knowledge base. The method can support four types of TOD cases, which are based on a firm's existing technologies and products, and TOD knowledge base is developed by using function information extracted from patent documents. In this paper, we introduce the overall framework of the method and provide application examples on the four TOD cases using the prototype system.