• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권11호
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• pp.4291-4310
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• 2015

This paper investigates the traffic offloading over unlicensed bands for two-tier multi-mode small cell networks. We formulate this problem as a Stackelberg game and apply a hierarchical learning framework to jointly maximize the utilities of both macro base station (MBS) and small base stations (SBSs). During the learning process, the MBS behaves as a leader and the SBSs are followers. A pricing mechanism is adopt by MBS and the price information is broadcasted to all SBSs by MBS firstly, then each SBS competes with other SBSs and takes its best response strategies to appropriately allocate the traffic load in licensed and unlicensed band in the sequel, taking the traffic flow payment charged by MBS into consideration. Then, we present a hierarchical Q-learning algorithm (HQL) to discover the Stackelberg equilibrium. Additionally, if some extra information can be obtained via feedback, we propose an improved hierarchical Q-learning algorithm (IHQL) to speed up the SBSs' learning process. Last but not the least, the convergence performance of the proposed two algorithms is analyzed. Numerical experiments are presented to validate the proposed schemes and show the effectiveness.

• 한국수학교육학회지시리즈D:수학교육연구
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• 제2권2호
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• pp.89-108
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• 1998

We conducted a survey with the objective of studying the teachers' perspective of their students' learning in traditional calculus and its teaching strategies. This survey was targeted at mathematics teachers of the junior colleges, polytechnics and universities in Singapore. In this paper we present findings of the first part of our survey. The first part addresses various issues related to the mathematics teachers' perception of the current status of calculus education in Singapore. The findings of this study will be unique in Singapore context because, according to the best of our knowledge, no such survey on calculus education has ever been undertaken in Singapore.

• 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.

• 공학교육연구
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• 제1권1호
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• pp.33-42
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• 1998

Three benefits of incorporating writing in engineering curricula are presented. The first benefit is in improving the communication skills which are essential for engineers and are attained through practice. The second benefit is in enhancing learning and is achieved by utilizing the complex process of writing to heighten the level of understanding. The third benefit, though difficult to recognize and even more difficult to promote in a society (and educational institutes) steeped in the behaviorist tradition, is in promoting meaningful learning by cultivating motivation internal to students themselves. The boundaries of writing activities are broadened to include that of stating a paragraph or even one complete sentence such that it may be incorporated in engineering without undue strain. A two-year trial of incorporating four types of writing assignments in six different courses (a total of 12 classes) at Michigan Technological University shows that writing assignments can be designed to achieve different degrees of the three aforementioned benefits. It is found that different types of writing activities need to be assigned depending on the status of course (elective vs. required) and on the composition of the students taking the course (upper division vs. lower division; majors vs. non-majors).

• 한국도서관정보학회지
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• 제39권2호
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• pp.449-467
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• 2008

본 연구에서는 정보활용능력을 향상시키기 위해 학교도서관의 사서교사와 일반 교과의 교사들 간의 협력 방안을 제시하고자 하였다. 또한 교육의 또 다른 주체인 학생을 중심으로 한 부분을 확대함으로써 좀 더 효율적인 교수-학습이 이루어질 수 있도록 하였다. 무엇보다 교사와 학생들의 커뮤니케이션에서 직접적인 교환이 이루어지는 지식을 중심으로 주제, 교육학적인 배경, 정보기술의 활용 등을 고려한 모형을 제안하였다.

• 벤처창업연구
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• 제13권4호
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• pp.99-116
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• 2018

본 연구의 목적은 기업의 성장단계별로 창업가가 갖춰야 할 핵심 역량요인이 반영된 통합 창업가 역량 모델을 제시하여 기술창업기업의 성공률을 제고하는 것이다. 연구의 목적을 달성하기 위해 본 연구는 초기 및 후기 기술창업기업의 핵심 창업가 역량과 기업성과 간의 관계, 그 관계를 강화하는 학습 역량의 조절효과를 실증분석 하였다. 연구의 결과는 다음과 같다. 첫째, 초기 기술창업기업 창업팀의 기술 기능적 역량, 창업가의 자원 활용 역량, 그리고 사업계획 수립 역량은 기업의 비재무적 및 기술적 성과를 모두 향상시키는 것으로 나타났다. 또한 기회 인식 역량은 비재무적 성과를 높이는 것으로 분석되었다. 이때 높은 수준의 학습 역량을 가진 창업가는 기술 기능적 역량과 자원 활용 역량 수준이 높아질수록 비재무적 성과를 더욱 향상시키며, 사업계획 수립 역량 수준이 높아질수록 기술적 성과를 더욱 향상시키는 것으로 확인되었다. 둘째, 후기 기술창업기업 창업가의 리더십과 자원 확보 역량은 기업의 비재무적 및 기술적 성과를 모두 향상시키는 것으로 나타났다. 또한 창업가의 전략적 역량은 비재무적 성과를 향상시키는 것으로 나타났다. 여기에서 학습 역량 수준이 높은 창업가는 전략적 역량 수준이 높아질수록 기업의 비재무적 성과를 더욱 향상시키는 것으로 분석되었다. 마지막으로 초기 및 후기 기술창업기업의 비재무적 성과와 기술적 성과는 모두 재무적 성과를 유의하게 향상시키는 것으로 나타났다.

• ETRI Journal
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• 제20권1호
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• pp.55-73
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• 1998

In this paper we analyze the technological accumulation processes in the Korean semiconductor industry from the institutional approach. Institutional approach, which is closely connected with Neo-Schumpeterian tradition, has emerged as an alternative theoretical framework to neoclassical approach to understand the process of producing technological knowledge. Traditional wisdom of neoclassical approach revealed the limitation to explain the complex nature of knowledge creation and diffusion. US patent data are analyzed in terms of the increasing trend of numbers and its content to measure the rate and direction of technological capability accumulation. This analysis shows that semiconductor technologies are one of the fastest growing fields among Korean technological activities. Moreover, the analysis of patent content suggests that fabrication technologies are the most important area within the technological development of semiconductors, whilst circuit design and testing technologies are beginning to increase in significance. In addition, it is examined how private sectors and public institutions have contributed to generate technological capabilities, and the relationship between them has been changed during the development processes. It is found that Korean firms enhanced their technological capabilities from the learning and assimilation of imported technology to enhanced in-house R&D capabilities in the later stage. The support of public institution and government policy also played significant role to this successful transformation in conjunction with vigorous R&D investment of public sector.

• Journal of Construction Engineering and Project Management
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• 제7권3호
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• pp.26-38
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• 2017

The architecture, engineering, and construction (AEC) industry is yet to formulate a holistic strategy to realign the evolving technological infrastructures with organisational ambitions and adaptive knowledge of the workforce. This study attempts to create an understanding of the underlying processes adopted by technology-enhanced construction organisations to disseminate and maintain knowledge within the workforce in order to keep pace with the evolving construction technologies. The study adopted expansive learning and adaptive expertise constructs to help better explain workplace learning support structures for organisational effectiveness in a turbulent situation. The two theories were tailored to empirically evaluate three case study construction organisations that have embarked on technology-enabled organisational changes. The study concluded on the creation of a facilitating workplace learning environment to enable the workforce to adapt into and resolve any inherent contradictions and cognitive ambiguities of the changing organisational conditions. This could ensure that novel and conflicting features of the emerging technologies can be adapted across the myriad multi-functional project activities in order to expand the frontiers of the technological capabilities to address the eminent issues confronting the AEC sector.

• 한국수학교육학회지시리즈D:수학교육연구
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• 제19권1호
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• pp.19-41
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• 2015

Previous studies indicated that students tended to hold less satisfactory beliefs about the discipline of mathematics, beliefs about themselves as learners of mathematics, and beliefs about mathematics teaching and learning. However, only a few studies had developed curricular interventions to change students' beliefs. This study aimed to examine the effect of a problem-solving curriculum (i.e., Mathematical Problem Solving for Everyone, MProSE) on Singaporean Grade 7 students' beliefs about mathematical problem solving (MPS). Four classes (n =142) were engaged in ten lessons with each comprising four stages: understand the problem, devise a plan, carry out the plan, and look back. Heuristics and metacognitive control were emphasized during students' problem solving activities. Results indicated that the MProSE curriculum enabled some students to develop more satisfactory beliefs about MPS. Further path analysis showed that students' attitudes towards the MProSE curriculum are important predictors for their beliefs.

• 인재니움
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• 제2권3호
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• pp.6-11
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• 1995