• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2000.07a
• /
• pp.59-62
• /
• 2000

A VLSI implementation of a self-learning neural network integrated circuits using a linearity synapse transistor is investigated. The thickness dependence of oxide current density, stress current, transient current and channel current has been measured in oxides with thicknesses between 41 and 112 $\AA$, which have the channel width$\times$length 10$\times$1${\mu}{\textrm}{m}$ respectively. The transient current will affect data retention in synapse transistors and the stress current is used to estimate to fundamental limitations on oxide thicknesses. The synapse transistor has represented the neural states and the manipulation which gave unipolar weights. The weight value of synapse transistor was caused by the bias conditions. Excitatory state and inhitory state according to weighted values affected the drain source current.

• Korean Journal of Materials Research
• /
• v.32 no.8
• /
• pp.333-338
• /
• 2022

In this work, we developed silver nanowires and a silicon based Schottky junction and demonstrated ultrafast broadband photosensing behavior. The current device had a response speed that was ultrafast, with a rising time of 36 ㎲ and a falling time of 382 ㎲, and it had a high level of repeatability across a broad spectrum of wavelengths (λ = 365 to 940 nm). Furthermore, it exhibited excellent responsivity of 60 mA/W and a significant detectivity of 3.5 × 10¹² Jones at a λ = 940 nm with an intensity of 0.2 mW cm^-2 under zero bias operating voltage, which reflects a boost of 50 %, by using the AC PV effect. This excellent broadband performance was caused by the photon-induced alternative photocurrent effect, which changed the way the optoelectronics work. This innovative approach will open a second door to the potential design of a broadband ultrafast device for use in cutting-edge optoelectronics.

• Asia-Pacific Journal of Business
• /
• v.14 no.3
• /
• pp.251-269
• /
• 2023

Purpose - This study estimated the value of tourists' willingness to pay (WTP) to develop and promote regional tourism and minimize external effects using the contingent valuation method (CVM). Design/methodology/approach - To reduce exaggeration bias, a major issue of CVM, a pilot survey was conducted to categorize bid value. Additionally, the payment method was divided into a tourism fund and tourism taxes, and the respondents' answers were reaffirmed in two stages. Findings - As a result of the analysis, the tourists' WTP was estimated to be 5,132 KRW (3.60 USD) for the tourism fund and 1,036 KRW (0.73 USD) for tourism taxes. Research implications or Originality - The results of this study provide implications for securing financial resources and establishing policies in Gangwon province, which promotes special self-governing.

• The Journal of Information Systems
• /
• v.25 no.1
• /
• pp.1-23
• /
• 2016

Purpose Self-congruity deals with the effect of symbolic value-expressive attributes on consumer decision and behavior, which is the theoretical foundation of the "non-utilitarian destination positioning". Functional congruity refers to utilitarian evaluation of a product or service by consumers. In addition, recent years, social network services, especially mobile social network services have created many opportunities for e-WOM communication that enables consumers to share personal consumption related information anywhere at any time. Moreover, self-construal is a hot and popular topic that has been discussed in the field of modem psychology as well as in marketing area. This study aims to examine the moderating effect of self-construal on the relationship between self-congruity, functional congruity and tourists' positive electronic word of mouth (e-WOM). Design/methodology/approach In order to verify the hypotheses, we developed a questionnaire with 32 survey items. We measured all the items on a five-point Likert-type scale. We used Sojump.com to collect questionnaire and gathered 218 responses from whom have visited Korea before. After a pilot test, we analyzed the main survey data by using SPSS 20.0 and AMOS 18.0, and employed structural equation modeling to test the hypotheses. We first estimated the measurement model for its overall fit, reliability and validity through a confirmatory factor analysis and used common method bias test to make sure that whether measures are affected by common-method variance. Then we tested the hypotheses through the structural model and used regression analysis to measure moderating effect of self-construal. Findings The results reveal that the effect of self-congruity on tourists' positive e-WOM is stronger for tourists with an independent self-construal compared with those with interdependent self-construal. Moreover, it shows that the effect of functional congruity on tourists' positive e-WOM becomes salient when tourists' self-construal is primed to be interdependent rather than independent. We expect that the results of this study can provide important implications for academic and practical perspective.

• The Korean Journal of Health Service Management
• /
• v.9 no.3
• /
• pp.175-185
• /
• 2015

Objectives : This study was did a meta-analysis of emergency room visits decreased effectiveness of self management education interventions in asthma among adult patients with asthma. Methods : A search of the database PubMed resulted in identifying 8,619 studies done between January 1990 and November 2012. STATA version 10.0 was used to analyze the effect size, explore possible causes of heterogeneity, and determine publication bias with a funnel plot. Results : We included 7 cases on emergency room visits decreased effectiveness of self management and education. Asthmatic patients experienced fewer attacks (summary effect size, 0.75; 95% confidence interval [CI], 0.65-0.95). We found that emergency room visits decreased effectiveness of self management and education were associated with statistically significant effects. Conclusions : Based on these finding, self management and education on interventions are necessary to prevent asthmatic attacks in patients and to reduce the severity of the attacks, and self management and education programs are needed in Korea.

• Korean Journal of Child Studies
• /
• v.38 no.1
• /
• pp.153-167
• /
• 2017

Objective: This study was aimed to examine the mediating effects of mother's marital conflict and satisfaction between father's child-rearing involvement and mother's warmth of parenting style, and the moderating effect of mother's depression and self-esteem. Methods: The analyses involved using cross-sectional weights from the 1,703 samples of the 5th Panel Study on Korean Children to classify them into high and low depression groups, and high and low self-esteem groups. Path analysis and multiple group comparison analysis were conducted, controlled by child sex, mother's age and highest education level, and household financial assets. Results: The results were as follows: First, mother's marital conflict and satisfaction had a mediating effect on the relationship between father's child-rearing involvement and mother's warmth of parenting style. Second, mother's depression and self-esteem levels had a moderating effect the relationship between father's child-rearing involvement and mother's warmth of parenting style. In particular, mother's depression level affected the path between marital conflict and warmth of parenting style, and mother's self-esteem level affected the path between marital satisfaction and warmth of parenting style. Conclusion: Father's child-rearing involvement and mother's psychological level affect mother's marital relations and parenting style. Also, father's parenting involvement and psychological support is needed for a mother to regulate mood disorders, including depression and any self-serving bias.

• Culinary science and hospitality research
• /
• v.18 no.4
• /
• pp.100-117
• /
• 2012

The purpose of this study is to investigate the structural relationships among frontline hotel employees' core-self evaluations (self-esteem, generalized self-evaluations, locus of control, and emotional stability) as personal resources, customer verbal aggression as a job stressor, and turnover intention as a job outcome. Data were gathered from a sample of frontline employees of 10 five-star hotels in Busan via self-administered questionnaires. A total number of 405 questionnaires were utilized. This study used structural equation modeling to verify the research model and hypotheses. As hypothesized, the results demonstrated that core-self evaluations reduced customer verbal aggression and turnover intention, and customer verbal aggression amplified turnover intention. Finally, practical implications were discussed in detail and limitations of the study and future research directions were also suggested.

• Journal of the Institute of Electronics Engineers of Korea SD
• /
• v.43 no.12 s.354
• /
• pp.1-7
• /
• 2006

An on chip voltage down converter (VDC) using the self temperature-compensation techniques is proposed. At a different gate bias voltage, PMOSFET shows different source to drain current characteristic according to the temperature variation. The proposed VDC can reduce its temperature dependency by the source to drain current ratio of two PMOSFET with different gate bias respectively. Proposed circuit is fabricated in Dongbu-anam $0.18{\mu}m$ CMOS process and experimental results show its temperature dependency of $-0.49mV/^{\circ}C$ and external supply dependency of 6mV/V. Total current consumption is only $1.1{\mu}A@2.5V$.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.2 no.4
• /
• pp.635-641
• /
• 1998

This paper presents development of a small size LNA operating at 824 ∼ 849 MHz used for a receiver of a CELLULAR CDMA Base station and a transponder. Using resistive decoupling circuits, a signal at low frequency is dissipated by a resistor. This design method increases the stability of the LNA and is suitable for input stage matching. The LNA consists of low noise GaAs FET ATF-10136 and internally matched VNA-25. The LNA is fabricated with both the RF circuit and the self-bias circuits in aluminum housing. As a result, the characteristics of the LNA implemented here shows above 35dB in gain and below 0.9dB in noise figure, 18.6dBm P1dB power, a typical two tone IM3, -31.17dB with single carrier backed off 10dB from P1dB.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2000.10a
• /
• pp.190-195
• /
• 2000

This paper presents the fabrication of the LNA which is operating at 2.13∼2.16 GHz for IMT-2000 lot-end receiver using series feedback and resistive decoupling circuit. Series feedback added to the source lead of a transistor keep the low noise characteristics and drop the input reflection coefficient of amplifier simultaneously. Also, it increases the stability of the LNA. Resistive decoupling circuit is suitable for input stage matching because a signal at low frequency is dissipated by a resistor in the matching network The amplifier consist of GaAs FET ATF-10136 for low noise stage and VNA-25 which is internally matched MMIC for high gain stage. The amplifier is fabricated with both the RF circuits and self bias circuit on the Teflon substrate with 3.5 permittivity. The measured results of the LNA which is fabricated using above design technique are presented more than 30 dB in gain P$\_$ldB/ 17 dB and less than 0.7 dB in noise figure, 1.5 in input$.$output SWR(Standing Wave Ratio).