• Journal of the Korean Institute of Navigation
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• v.20 no.3
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• pp.117-126
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• 1996

Generally, the distortion of the negative feedback amplifier is reduced by a factor equal to the return difference (1+${\beta}_1A_1$), but the proposed feedforward amplifier is reduced by a factor equal to the square of the return difference (1+${\beta}_1A_1$). In this paper, a feedforward amplifier with error correction is designed and implemented. So as to evaluate the characteristics of the harmonic distortion that the inverting feedforward amplifier is compared with that of the reference amplifier without feedforward error correction. It is confirmed that the proposed method should be able to reduce much greater than compared with a conventional negative feedback amplifier. Therefore it should be noted that the proposed feedforward amplifier network is also acceptable for wide-band amplifiers and the network which is demanded to improve the harmonic distortion.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.59 no.2
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• pp.471-475
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• 2010

This paper presents a frequency synthesizer using low voltage active inductor VCO(Voltage Controlled Oscillator). The low voltage active inductor VCO with feedback resistor increases its equivalent inductance and the quality-factor(Q). Under certain conditions, the low voltage active inductor with feedback resistor generates a negative resistance at the input. In this paper, the conditions for negative resistance are obtained by small signal analysis. The designed low voltage active inductor VCO covers a frequency band between 1059MHz and 1223MHz. The measured phase noise at 1.178GHz is -81.8dBc/Hz at 1MHz offset.

• 한국정보디스플레이학회:학술대회논문집
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• 2007.08a
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• pp.829-832
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• 2007

A high-speed and accurate analog buffer is proposed for mobile display using LTPS TFTs. The proposed analog buffer is common source type with sampling and negative feedback mode. Therefore, driving speed of the proposed buffer is faster than previously reported one. In addition, the accuracy is very high because of high negative feedback gain. The simulation results show that maximum mischarging voltage of the proposed buffer is 8mV and previously reported one is 37mV. And Power consumption of the proposed buffer is $43.1{\mu}W$, which is 73% of previously reported one.

• Proceedings of the IEEK Conference
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• 1999.11a
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• pp.1167-1170
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• 1999

We consider a negative unity feedback control system in which a controller and a given minimum phase transfer function are in cascade. This paper present a sufficient condition for the existence of a constant gain controller under which the overall closed loop characteristic polynomial is stable. This sufficient condition is based on Lehnigk's lemmas.

• 제어로봇시스템학회:학술대회논문집
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• 1990.10a
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• pp.96-100
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• 1990

Dynamic modelling and controller design technique for constant-frequency series resonant converter with buck type preregulator are mainly described in this paper. An equivalent circuit model is derived and a state equation is developed from this model. To improve the dynamic performance, a negative feedback of inductor current is added to the proportional and integral control of output voltage. Furthermore, an optimization technique with prescribed eigenvalue region is applied to the determination of feedback gains. With the presented design method, much better dynamic performance can be obtained.

• Proceedings of the KIEE Conference
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• 1988.07a
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• pp.477-479
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• 1988

A new method of optical short pulse generation using stable diode lasers with negative optoelectronic feedback is demonstrated experimentally. About 1 nanosecond pulses with 300 MHz repetition rate are generated.

• Proceedings of the Safety Management and Science Conference
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• 2011.04a
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• pp.19-28
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• 2011

This paper reviewed the relationship between job characteristics and incremental innovation, and the moderating effect of tenure. The results of multiple regression analysis, based on the responses from 241 employees in service industry, showed that job variety, identity, importance, autonomy and feedback have positive relationships with incremental innovation. In moderating effects, tenure interacts with variety and identity to have positive effects on incremental innovation, but tenure interacts with job importance, autonomy and feedback to have negative effects on incremental innovation.

• Journal of Korea Trade
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• v.25 no.6
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• pp.57-77
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• 2021

Purpose - International strategic alliance has been regarded as a strategic decision made by firms' managerial problems and ensure performance growth. From the perspective of the proactive behavior for changing strategies in a global market, this study aims to identify whether performance feedback influences firms' decisions to pursue strategic alliances. This study examines the effects of performance feedback on performance when firms use strategic alliances. Design/methodology - To analyze the impact of performance feedback on forming an international strategic alliance, this study adopt the concept of performance feedback to develop a research model and our hypotheses. Thus, this study used a two-stage least squares unbalanced panel data analysis with random effects. This study is based on 24,543 observations from Korean manufacturing firms from 2007 to 2016. Findings - The results show that firms pursue the formation of strategic alliances more actively, if their past financial and R&D performance are lower than their aspiration level, based on the result of performance feedback. An in split sample analysis for examining the effect of a firm's technology sophistication based on the OECD's classification, negative innovation performance discrepancy has positive effects on the probability of international alliance in high-tech and medium-high-tech industries. Financial performance also improves when a firm decides to form a strategic alliance based on the results of performance feedback. Originality/value - This research extends recent efforts to better understand the effect of performance feedback on firms' performance when they use strategic alliances. These findings suggest that the CEOs and managers of firms should consider the performance feedback perspective when deciding to pursue a strategic alliance to improve performance. In other words, the decision-makers in a firm must analyze and consider various complex variables inside and outside the firm and expand such subjects of examination to more complex and dynamic factors.

• Journal of the Korea Computer Industry Society
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• v.5 no.1
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• pp.123-130
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• 2004

In this paper, an advanced error tracking algorithm by using feedback channel was proposed for error resilient transmission. Using this proposed algorithm, the propagation of errors were reduced within the decoded data over bit error prone network. The addresses of corrupted blocks are reported to encoder by decoder. With negative acknowledgments of feedback channel, the encoder can precisely calculate negative acknowledgments and track the propagated errors by examining the backward motion dependency for proper pixel in the current encoding frame. The error-propagation effects can be terminated completely by INTRA refreshing the affected macro-blocks by using proposed error tracking algorithm. By utilizing the selective four-corner error tracking approximation, the error tracking computations of the proposed algorithm is less than that of the algorithm using full pixel without substantial degradation in video quality. The proposed algorithm can track errors rapidly and accurately.

• The Journal of the Korea Contents Association
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• v.21 no.4
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• pp.153-165
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• 2021

The purpose of this study is to find precedent factors that positively and negatively affect the information security compliance intention. In detail, the study finds precedent factors to reduce anxiety that negatively affects compliance intentions, and confirms that feedback moderates the negative relationship between anxiety and compliance intention. The questionnaire was targeted at office workers working in organizations with information security policies, and research hypothesis verification was conducted through structural equation modeling to analyze main effects and moderation effects. As a result of the study, anxiety had a negative effect on the compliance intention, and the organizational culture that was raised through management support reduced anxiety of employees. In addition, feedback mitigated the negative impact relationship between anxiety and compliance intention. The implications of this study were to suggest a direction to mitigate the anxiety of the employees of the organization through the introduction and operation of information security technology.