• Journal of Internet Computing and Services
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• v.20 no.5
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• pp.1-8
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• 2019

This paper carried out a study to reduce damage from jellyfish whose population has increased due to global warming. The emergence of jellyfish on the beach could result in casualties from jellyfish stings and economic losses from closures. This paper confirmed from the preceding studies that the pattern of jellyfish's appearance is predictable through machine learning. This paper is an extension of The prediction model of emergence of Busan coastal jellyfish using SVM. In this paper, we used deep neural network to expand from the existing methods of predicting the existence of jellyfish to the classification by index. Due to the limitations of the small amount of data collected, the 84.57% prediction accuracy limit was sought to be resolved through data expansion using bootstraping. The expanded data showed about 7% higher performance than the original data, and about 6% better performance compared to the transfer learning. Finally, we used the test data to confirm the prediction performance of jellyfish appearance. As a result, although it has been confirmed that jellyfish emergence binary classification can be predicted with high accuracy, predictions through indexation have not produced meaningful results.

• Journal of the Korean Society of Child Welfare
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• no.56
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• pp.1-32
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• 2016

The present study examined the mediating effects of parent-child stress on the relationship between perceived neighborhood disorder and problem behaviors. The research hypotheses were based on Pearlin's(1999) stress process model and findings from previous literature. The data from the $4^{th}$-wave of the Korea Youth Panel Survey (KYPS; a panel survey of $8^{th}$-grade students) were analyzed to identify the relationships between the study variables. The sample included 2,301 adolescents (16 to 18 years old). Findings showed that parent-child stress partially mediated the relationship between perceived neighborhood disorder and problem behaviors in adolescents. As adolescents perceived more neighborhood disorder, they were more likely to experience anxiety/depression and aggression. In addition, greater neighborhood disorder were found to be associated with the higher levels of the parent-child stress. Furthermore, when controlling for perceived neighborhood disorder, the higher levels of the parent-child stress were found to be associated with the higher levels of anxiety/depression and aggression. The Sobel test and bootstrapping results showed that parent-child stress partially mediates the relationship between perceived neighborhood disorder and anxiety/depression, as well as the relationship between perceived neighborhood disorder and aggression. Based on the results, we discussed social welfare implications of the study findings to prevent adolescent problem behavior as well as the limitations of the study.

• Proceedings of the KIEE Conference
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• 2003.11b
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• pp.179-182
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• 2003

A simulation on bootstrapping circuit has been performed by modelling a coaxial cable as a transmission line. It is shown that the bootstrapping circuit could be unstable due to the transmission line effect though an ideal amplifier is used. While the conventional bootstrapping circuit does not cancel the input capacitance of the input buffer, a new bootstrapping circuit that cancels input capacitance of the input buffer has been proposed. The proposed bootstrapping circuit consists of the input buffer of which gam is larger than 1 and a feedback resistor to control the loop gain. The proposed bootstrapping circuit has higher input impedance than that of the conventional circuit.

• Annual Conference on Human and Language Technology
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• 2018.10a
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• pp.61-66
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• 2018

인과관계 추출이란 어떠한 문장에서 인과관계가 존재하는지, 인과관계가 존재한다면 원인과 결과의 위치까지 분석하는 것을 말한다. 하지만 인과관계 관련 연구는 그 수가 적기 때문에 말뭉치의 수 또한 적으며, 기존의 말뭉치가 존재하더라도 인과관계의 특성상 새로운 도메인에 적용할 때마다 데이터를 다시 구축해야 하는 문제가 있다. 따라서 본 논문에서는 도메인 특화에 따른 데이터 구축비용 문제를 최소화하면서 새로운 도메인에서 인과관계 모델을 잘 구축할 수 있는 통계 기반 모델을 이용한 인과관계 데이터 확장 방법과 도메인에 특화되지 않은 일반적인 언어자질과 인과관계에 특화된 자질을 심층 학습 기반 모델에 적용함으로써 성능 향상을 보인다.

• Journal of the Korean Society of Propulsion Engineers
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• v.2 no.1
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• pp.41-49
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• 1998

A nonlinear mathematical model of longitudinal combustion instability appropriate for ramjets and augmenters was developed based on modal analysis. The model was limited to a two-mode formulation. The associated differential equations were solved both analytically and numerically. The two-mode nonlinear model is capable of predicting the bootstrapping effect which characterizes nonlinear velocity-sensitive combustion response. Also, parametric studies were performed.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.17 no.2
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• pp.3-17
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• 2007

Receiver access control scheme is proposed to protect multicast distribution tree from DoS(Denial-of Service) attack induced by unauthorized use of IGMP(Internet group management protocol), by extending the security-related functionality of IGMP. Based on a specific network and business model adopted for commercial deployment of IP multicast applications, key management scheme is also presented for bootstrapping the proposed access control as well as accounting and billing for CP(Content Provider), NSP(Network Service Provider), and group members.

• Proceedings of the Korean Society of Computer Information Conference
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• 2023.07a
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• pp.675-678
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• 2023

본 연구는 팀기반학습을 활용한 교과목을 수강한 간호대학생 56명을 대상으로 동료평가와 학업성취도와의 관계에서 수업몰입의 매개효과를 검정하였다. 매개효과 분석은 PROCESS macro Program의 model 4를 부트스트래핑(bootstrapping)을 이용하여 검정하였다. 분석 결과는 첫째, 동료평가, 수업몰입과 학업성취도 간에 유의한 정적 상관이 있는 것으로 나타났다. 둘째, 수업몰입은 동료평가가 학업성취도에 미치는 영향을 부분매개 하는 것으로 확인되었다. 동료평가가 간호대학생을 위한 TBL 과정에서 수업몰입과 팀워크를 촉진하고 궁극적으로 학업성취도를 향상시키는 효과적인 도구가 될 수 있음을 시사하며, 교수자가 학생의 학습성과를 개선할 수 있는 보다 효과적인 교육 전략 및 개입을 개발하는 데 도움이 될 수 있다.

• Journal of Digital Convergence
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• v.15 no.12
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• pp.381-391
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• 2017

The purpose of this study is to investigate the effect of optimism on stress on happiness index. The subjects were 3 and 4 grade students who had clinical practice experience among 3 nursing students at G university, and 362 questionnaires were used as research data. The data analysis used regression analysis, SPSS macro and bootstrapping methods to examine the mediating effects of optimism on college students' stress and happiness. The results showed that stress, happiness, and optimism were significantly correlated, and stress had a direct effect on college students' happiness. In other words, the higher the level of stress, the lower the happiness index of college students. The optimism was partially mediated between stress and college students' happiness index. Therefore, in order to increase the happiness index of college students, it is necessary to develop and implement a program for happiness enhancement as one of the program strategies that can enhance stress.

• Korean Journal of Culture and Social Issue
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• v.27 no.4
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• pp.609-628
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• 2021

The purpose of this study was to examine the dual mediating effects of self-compassion and gratitude between perceived stress and insomnia in college students. For this study, 330 undergraduate students from Gyeongsang-do and Jeolla-do were surveyed about perceived stress, insomnia severity, self compassion, and gratitude. Regression, SPSS Macros, and bootstrapping methods were applied to verify the dual mediation effects. The results of this study were as follows. First, the positive effect of the perceived stress on the insomnia was observed to be significant. Second, self-compassion partially mediated the relationship between perceived stress and insomnia. Third, gratitude partially mediated the relationship between perceived stress and insomnia. Lastly, the perceived stress indirectly influenced insomnia through the dual mediation effect of self-compassion and gratitude. Focusing on these results, we discussed that stress management is important to prevent and alliviate insomnia of undergraduates and that intervention to promote self compassion and gratitude is needed.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.41 no.1
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• pp.53-60
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• 2004

This work describes a l0b 150 MSample/s CMOS pipelined A/D converter (ADC) based on advanced bootsuapping techniques for higher input bandwidth than a sampling rate. The proposed ADC adopts a typical multi-step pipelined architecture, employs the merged-capacitor switching technique which improves sampling rate and resolution reducing by $50\%$ the number of unit capacitors used in the multiplying digital-to-analog converter. On-chip current and voltage references for high-speed driving capability of R & C loads and on-chip decimator circuits for high-speed testability are implemented with on-chip decoupling capacitors. The proposed AU is fabricated in a 0.18 um 1P6M CMOS technology. The measured differential and integral nonlinearities are within $-0.56{\~}+0.69$ LSB and $-1.50{\~}+0.68$ LSB, respectively. The prototype ADC shows the signal-to-noise-and-distortion ratio (SNDR) of 52 dB at 150 MSample/s. The active chip area is 2.2 mm2 (= 1.4 mm ${\times}$ 1.6 mm) and the chip consumes 123 mW at 150 MSample/s.