• ETRI Journal
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• 제35권4호
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• pp.706-709
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• 2013

As an alternative to the traditional pilot-aided orthogonal frequency division multiplexing (OFDM), the time-domain pseudonoise (PN)-padded OFDM provides a higher spectral efficiency. However, the carrier frequency offset (CFO) attenuates peaks of the conventional PN correlation output, which limits the CFO estimation range of the OFDM synchronizer. An improved correlation is proposed in this letter to remove the CFO-induced amplitude attenuation of correlation peaks. For a synchronizer adopting the designed correlator, a larger range of CFO acquisition is obtained through using wider correlation windows with a smaller interval between them. The proposed method of CFO acquisition is verified in a digital terrestrial multimedia broadcast receiver, in which the synchronizer is able to acquire CFOs up to ${\pm}320$ kHz in the DVB-T F1 channel. Furthermore, the acquisition range can be expanded in more favorable channels.

• 벤처창업연구
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• 제10권3호
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• pp.85-97
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• 2015

본 연구에서는 자원의존이론을 이용하여 사외이사 비중과 최고경영자의 이사회 의장직 겸임 효과가 하이테크 산업에 속해 있는 국내 상장기업의 인수합병 성과에 미치는 영향을 2004년부터 2012년까지 수행된 인수합병거래 246개를 대상으로 실증 분석하였다. 분석결과에 따르면, 사외이사 비중은 인수합병 성과에 정(+)의 영향을 미치는 것으로 나타났다. 그러나 최고경영자가 이사회 의장직을 겸임하는 경우 인수합병 성과에 부(-)의 영향을 미치는 것으로 나타났다. 사외이사의 비중과 최고경영자의 이사회 의장직 겸임이 지닌 상호작용의 효과를 살펴본 결과, 최고경영자가 이사회 의장직을 겸임하는 경우 사외이사의 비중이 인수합병 성과에 정(+)의 영향을 미치는 것으로 나타났다. 그러나 이사회 의장이 독립적인 지위를 가지는 경우 사외이사의 비중이 인수합병 성과에 부(-)의 영향을 미치는 것으로 나타났다. 아울러 연구결과의 타당성을 확보하기 위해 상호작용항을 통한 회귀분석 및 다양한 사건기간을 대상으로 실증분석을 수행하여 동일한 결과를 얻을 수 있었다. 최고경영자가 이사회 의장직을 겸임하는 경우 리더십 강화 및 조직 내 지휘체계 확립으로 인해 기업 외부의 이해관계자로부터 정당성을 확보하게 된다. 이를 통해 이사회의 자원의존 기능이 강화되며 인수합병 성과에 긍정적인 영향을 미치는 것으로 해석된다. 반대로 이사회 의장이 독립적인 지위를 가지는 경우 최고경영자의 최고책임자로서의 외부 정당성이 약화된다. 따라서 이사회의 자원의존 기능이 감소되고 인수합병 성과에 부정적인 영향을 미치는 것으로 해석할 수 있다. 기존의 선행연구에서는 최고경영자의 이사회 의장직 분리의 긍정적인 효과에 대해서 주목하였다면, 본 연구에서는 최고경영자의 이사회 의장직 겸임의 긍정적인 효과를 실증적으로 보여주었다는 점에서 그 의의가 있다고 생각한다.

• 한국통신학회논문지
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• 제38A권5호
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• pp.416-425
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• 2013

A hybrid PN code phase acquisition system based on a least-mean-square adaptive filter, interpreted as a channel estimator is proposed and analyzed for direct-sequence spread-spectrum systems under frequency selective Rayleigh fading channels. Closed form expressions are derived for the filter tap weights and detection/false alarm probabilities. Compared to previously proposed systems, the proposed system achieves smaller mean acquisition times, is more robust to the operating signal-to-noise ratio and allows for multiplication free tap weight updates.

• 한국경영과학회지
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• 제19권2호
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• pp.21-43
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• 1994

Software acquisition involves purchase of new technology as well as the product itself. Consequently, evaluation of candidate packages or development contractors requires formal models that can objectively compare the candidates' technological characteristics with respect to user requirements. This paper proposes three technological evaluation models for software acquisition : 1) a structural model dthat organizes the technological factors to be evaluated, 2) a scoring model that quantifies the candidates' technological values, and 3) an organization model that orgnizes and assigns responsibilities to technical evaluators. Three models, initially built on expert surveys and later refined through interviews with opinion leaders, are primarily intended for governmental use : the Korean government is expected to use these models as the software acquisition standards starting in 1994.

• 정보관리연구
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• 제32권3_4호
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• pp.31-42
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• 2001

전문도서관이 당면한 문제는 변화하는 출판 및 도서관 환경 속에서 제한된 자원으로 이용자의 다양한 요구를 만족시키기가 더욱 어려워지고 있다는 점이다. 최근 인터넷과 정보기술의 발달 그리고 전자자원의 증가는 자료의 확인과 전달 시스템의 향상 등 공동수서의 기술적인 기반을 제공해 주었다. 본 논문은 전문도서관 공동수서의 배경과 방법을 CRL, OhioLINK, RLG Conspectus, TRLN 등의 사례들을 중심으로 살펴보고, 효과적인 공동수서를 위한 과제와 전략을 제시하였다.

• ETRI Journal
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• 제30권4호
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• pp.495-505
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• 2008

This paper presents a parallel processing searcher structure for the initial synchronization of a direct sequence ultra-wideband (DS-UWB) system, which is suitable for the digital implementation of baseband functionalities with a 1.32 Gsample/s chip rate analog-to-digital converter. An initial timing acquisition algorithm and a data demodulation method are also studied. The proposed searcher effectively acquires initial symbol and frame timing during the preamble transmission period. A hardware efficient receiver structure using 24 parallel digital correlators for binary phase-shift keying DS-UWB transmission is presented. The proposed correlator structure operating at 55 MHz is shared for correlation operations in a searcher, a channel estimator, and the demodulator of a RAKE receiver. We also present a pseudo-random noise sequence generated with a primitive polynomial, $1+x^2+x^5$, for packet detection, automatic gain control, and initial timing acquisition. Simulation results show that the performance of the proposed parallel processing searcher employing the presented pseudo-random noise sequence outperforms that employing a preamble sequence in the IEEE 802.15.3a DS-UWB proposal.

• International Journal of Advanced Culture Technology
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• 제9권4호
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• pp.118-125
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• 2021

This study's purpose is to examine the effects of mobile apps on learners' vocabulary acquisition and to analyze students' perceptions and opinions about the vocabulary app. To this end, this study set up a control group, which was given explicit instructions in the classroom by the instructor and an experimental group, which used a vocabulary app. The vocabulary acquisition test results suggested that the difference between the the two groups was insignificant. However, user satisfaction with regard to the mobile app was high, and the reasons given were the following: convenience, efficiency of memorizing, having fun while learning, and the app's interface. Based on these results, this study suggests that teachers should use mobile apps much more actively in classroom instruction, and encourge students to let apps play a more active role in their language studies.

• Asia pacific journal of information systems
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• 제30권4호
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• pp.879-918
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• 2020

One of the challenges faced by Talent Acquisition teams today pertains to the acquisition of human resources by matching job descriptions and skillsets desired. It is more so in the case of competitive sectors like the Indian IT sector. There can be various channels for Talent Acquisition and accordingly, the cost and benefits might vary. However, the consequences of a mismatch have an impact on the quality of deliverables, high recruitment expenses and loss of revenue for the organization. With increased and diverse sources of data that are available to organizations today, there is ample opportunity to apply analytics for informed decision making in this field. This paper reveals useful insights that help streamline the Talent Acquisition process in the Indian IT Industry. The paper adopts a data-centric approach to examine the critical determinants for efficient and effective Talent Acquisition process in IT organizations. Selected supervised machine learning algorithms are applied for the analysis of the dataset. The study is likely to help organizations in reassessing their talent acquisition strategy with respect to key parameters like expected cost to company (CTC), candidate sourcing channels and optimal joining period.

• Journal of Information Science Theory and Practice
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• 제10권3호
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• pp.24-39
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• 2022

Online learning is becoming ubiquitous worldwide because of its accessibility anytime and from anywhere. However, it cannot be successfully implemented without understanding constructs that may affect its adoption. Unlike previous literature, this research extends the Unified Theory of Acceptance and Use of Technology with three well-known theories, namely compatibility, online self-efficacy, and knowledge sharing and acquisition to examine online learning adoption. A total of 264 higher education students took part in this research. Partial Least Squares-Structural Equation Modeling was used to evaluate the proposed theoretical model. The findings suggested that performance expectancy and compatibility were significant predictors of behavioral intention, whereas behavioral intention, facilitating conditions, and compatibility had a significant and direct effect on online learning's actual use. The results also showed that knowledge acquisition, knowledge sharing, and online self-efficacy were determinates of performance expectancy. Finally, online self-efficacy was a predictor of effort expectancy. The proposed model achieved a high fit and explained 47.7%, 75.1%, 76.1%, and 71.8% of the variance of effort expectancy, performance expectancy, behavioral intention, and online learning actual use, respectively. This study has many theoretical and practical implications that have been discussed for further research.

• 산업경영시스템학회지
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• 제46권4호
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• pp.304-311
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• 2023

The 4th Industrial Revolution and the continuous development of Science and Technology have also required a speedy business promotion method in the defense industry. Advanced countries including the United States are already boldly innovating the existing high-cost and long-term acquisition system with the highest priority in weapons development to cope with the military rise of Russia and China. The Ministry of National Defense and the Defense Acquisition Program Administration have also recently introduced a quick acquisition system and are applying it to business promotion. In addition, some small-scale projects and weapons systems are being reorganized so that they can be managed by the units demanding them. After an organizational diagnosis of the Project Acquisition Group by the Ministry of National Defense in 2020, it has been reassigned as a subordinate unit of the Army Logistics Command from a direct unit managed by the Army HQ. As a result, problems such as work conflict or redundancy have been identified. In addition, a system has been implemented to shorten the acquisition period by applying a rapid acquisition program in the field of weapons systems by benchmarking the rapid acquisition program of advanced countries. The force support system project process will also need to introduce such a quick acquisition system. In addition, the Ministry of National Defense is considering ways to delegate some weapon systems to each military, which will then carry out tasks ranging from requirements determination to project management. Accordingly, it is now time to expand the organization for the management of the Army's weapons system acquisition project. Therefore, in this paper, the Army Project Acquisition Group was analyzed on its organization, acquisition procedures, and cooperation systems, with presentations of development plans for each field.