• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.4
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• pp.1971-1982
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• 2014

The purpose of the this study is to analyze what business value orientations are more effective on the enhancement of productivity and performance indexes of IT companies. Especially we are interest in the moderate effect of business types such as IT manufacturing, IT services, and non-IT manufacturing companies. The empirical test results was somehow different from the theoretical researches. Customer orientation affects productivity directly and performance indexes indirectly. Whereas, technology innovation orientation didn't affects productivity and performance indexes directly, except IT services companies. Corporate social responsibility affects performance indexes directly, but not productivity. We could conclude that the type of business is an important moderator between business value orientations and enterprise performance factors.

• The Journal of the Acoustical Society of Korea
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• v.36 no.2
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• pp.123-129
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• 2017

In this paper, the realization of a directional digital hearing aid was considered. Conventional time domain time delay method was replaced with digital filters in order to make any general-purposed DSP (Digital Signal Processing) chip to produce the similar directivity pattern. Both the time delay algorithm and the digital filter algorithm were initially evaluated by Matlab (Matrix laboratory) for comparison, and it was confirmed by CSR 8675 Bluetooth DSP IC (Digital Signal Processing Integrated Circuit) chip firmware realization. Some remote control features by a smart phone was added to the smart hearing aid for user interface easiness.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.13 no.4
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• pp.386-392
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• 2002

This paper presents a basic characteristics of 4-element circular array dipole antennas for 4-sector beam steering. The coupled integral equations for the unknown current distributions on dipole elements are derived and solved by applying Galerkin's method of moments. The parasitic elements have been used to increase the directional gain and the beam is steered electronically either by sswitching between the parasitic elements or switching the position of the active element. The parasitic elements are switched short-circuited or open-circuited as required to steer a directional beam. In order to verify the theoretical analysis, the radiation pattern was compared with experiments.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38C no.11
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• pp.1074-1077
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• 2013

This paper analyzes the benefit of using directional antennas against eavesdropping attack in millimeter wave (mmWave)-based networks. All devices are equipped with a directional antenna or an omni-directional antenna in a single-hop communications. The probability of a device being detected by an eavesdropper is analyzed based on the exposure region of a device. The relative detection rate is introduced to represent the benefit of using directional antenna. Numerical results show that there exists an optimal number of devices that maximizes the detection probability and it varies according to the parameters such as antenna beamwidth. It shows that the use of directional antenna enables to protect the devices from the detection by an eavesdropper for almost the whole situation in mmWave band communication.

• Proceedings of the KAIS Fall Conference
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• 2010.05b
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• pp.796-799
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• 2010

본 연구에서는 사회적기업육성법에 의해 인증 받은 한국의 사회적 기업을 대상으로 사회적 기업 운영자 및 주요 경영진의 마케팅 지향성((1) 고객지향성, (2) 경쟁자 지향성 (3) 부서간 유효성)이 기업의 경영성과((1) 재무성과 (2) 사업성과 (3) 조직효과성 )에 미치는 영향을 고찰하고자 한다. 사회적 기업은 수익성과 공공성을 동시에 추구하는 목적을 가지고 있기 때문에 일반적 의미의 기업이라 보기 어렵다. 무엇보다도 이윤의 극대화가 제한되기 때문이다. 또한 현재 사회적 기업에 대한 접근이 복지적 측면에서 많이 이루어지고 있는 것도 사실이다. 그러나 현대적 의미의 사회적 기업은 일정부분 일반기업과 경쟁해야 하기 때문에 스스로의 경쟁력을 갖추어야만 지속성을 유지할 수 있으며 사회적 비용을 절감할 수 있다. 사회적 기업이 일정한 수익성을 지속적으로 추구하지 못하는 경우 정부의 재정 부담이 증가하여 사업의 지속성이 어려움에 빠지게 될 수도 있다. 따라서 본 연구에서는 사회적 기업의 마케팅 지향성에 따른 경영성과를 실증 분석해 봄으로써 사회적 기업이 가져야할 무형자산인 마케팅지향적 사고 및 행위에 대한 시사점을 도출해 보고자 한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37 no.1B
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• pp.15-20
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• 2012

In this paper, an algorithm that enhances the conventional directional CSMA/CA protocol in IEEE 802.15.3c is proposed under saturation environments. For the algorithm, a Markov chain model is presented and analyzed in no-ACK mode. The effects of directional antennas and the features of IEEE 802.15.3c MAC are considered in the model. The optimal sizes of contention window are derived from the numerical results. The numerical results show that the proposed directional CSMA/CA algorithm outperforms conventional one. The overall analysis is verified by simulation. The obtained results provide the criterion for selecting the optimal parameters and developing a MAC protocol that enhances the performance of mmWave WPANs.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37 no.1B
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• pp.9-14
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• 2012

The neighbor discovery using directional antennas in mmWave band is a prerequisite for communications and this issue is crucial and urgent. In this paper, the synchronized, direct, two-way directional neighbor discovery process is analyzed mathematically for mmWave WPANs. The analysis is based on the values which are derived from the effect of using directional antennas. The neighbor discovery probability for a given amount of time is considered and several performance measures such as the optimal sojourn time are derived in closed forms. Numerical results are obtained using parameters based on the IEEE 802.15.3c. The mathematical analysis provides the theoretical basis for the directional neighbor discovery process.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.11 no.2
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• pp.278-285
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• 2000

This paper presents the basic characteristics of the beam tilting dipole antenna element in which one reactance element is used for the impedance matching at the feed point. The radiation pattern is tilted by the properly determined driving point position, and the loading reactance is used to obtain forced resonance without great changes in tilt angle. The numerical results demonstrate that the reactance element should be loaded in the region where the driving point is placed to obtain forced resonance of the antenna with little changes in beam tilt angle. In case the proposed forced resonant beam tilting antenna with $0.8\lambda$ length is driven at $0.2\lambda$ from the center, the main beam tilt angle o.5 57.7 degrees, the highest power gain of 8.6 dB are obtained.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.27 no.10
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• pp.935-940
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• 2016

Directed energy weapon enables to radiate the concentrated energy so as to result in distraction and overload of the target electronics. Analysis on effectiveness of weapon system can be important consideration in order to determine performance and design weapon system. In this paper, air defense weapon system, which is one of directed energy weapon system is studied. In order to analyze the effectiveness, the reflector antenna with high power circularly polarized horn antenna is designed, and power density in axial effective area is simulated and calculated using Friis formula. Through the study, the validity of antenna system is verified, and the effectiveness of directed energy weapon system on the target is evaluated.

• Proceedings of the KAIS Fall Conference
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• 2011.12a
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• pp.78-81
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• 2011

The main object of this study is explore to be consider a mediation model on the entrepreneurial orientation, market orientation, and business performance of the non-profit organization in the Western Gyeongnam and Busan Regions of South Korea. As a result, the $H_1$ was not shown to significantly the financial performance, and From $H_2$ to H8 was adopted to be effect on the variable. This study will be able to become data that is suitable system introduction in various field of Not-Profit organization and sector.