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영압력 구배 마찰 계수 데이터 기반의 천이모델 계수의 베이지안 추론
배재현(Jae Hyeon Bae),장경식(Kyoungsik Chang) 대한기계학회 2021 大韓機械學會論文集B Vol.45 No.12
난류 모델의 모델 계수는 등방성난류, 경계층, 또는 제트 유동과 같은 비교적 간단한 유동형태에서 유도되거나 실험적으로 추정되기 때문에 복잡한 난류 유동에 적용 시 불확실성이 존재한다. 이러한 불확실성을 정량화하고 최적의 모델 계수를 추정하기 위한 방법의 하나로 실험을 통한 관측값을 추가하여 최적의 모델 계수를 구하는 베이지안 추론이 사용된다. 본 논문에서는 Menter’s γ-Reθ 천이 모델 계수 7개 ca1, ce1, ce2, σγ, cθt, σθt을 고려하였으며 기준값에서 최소 ±10% 최대 ±50% 범위로 변화시켰다. 베이지안 추론을 위한 관측치로는 영압력구배 천이 난류 평판의 마찰계수 실험값(T3A)을 고려하였다. 베이지안 추론 시 필요한 계산량을 줄이기 위해 NIPC(non-intrusive polynomial chaos) 기반의 대리 모델을 사용하였다. 베이지안 추론 후 교정된 모델 계수는 천이구간에서 7% 더 향상된 예측결과를 보였다. Turbulent model coefficients are derived from the analysis of simple flow such as isotropic turbulence, turbulent boundary layer, jet and wake. However, there is uncertainty when applied to complex transitional and turbulent flows. As an uncertainty quantification method, Bayesian inference is applied to obtain a optimized model coefficient by considering experimental data for observations data. In this work, seven coefficients (ca1, ce1, ca2, ce2, σγ, cθt and σθt) in Menter’s γ-Reθ transition model were considered, and vary from at least 10% to maximum of 50% from the reference value. Bayesian inference was applied at transition flow of flat plate skin friction coefficient in a zero-pressure gradient with experiment (T3A). To reduce the computational time, non-intrusive polynomial chaos method was used as a surrogate model. Calibrated coefficients showed seven percent better prediction in the transition region.
초등학생을 위한 종교 교육 프로그램이 다문화수용성에 미치는 영향 연구
배재현 ( Bae Jae Hyeon ) 부산외국어대학교 다문화연구소 2020 다문화사회와 교육연구 Vol.5 No.-
The purpose of this study was to analyze the effect of religious education program on the multiculture acceptance of elementary students. To accomplish this, an religious education program was developed from references to domestic and foreign books, studies, and programs. This study was designed by 3 religious education programs for Creative experience activities, Korean, Social studies. The subjects of the study were 20 elementary students in one 3rd grade class of G elementary school located in Busan City. Pre- and post-questionnaire surveys were conducted with these students. The main contents of this religious education programs are so far beyond religious education centered on religious life, religious conflict, history, content, culture and religious prejudice of various religions. The effects of the program on the multicultural acceptance of these students were analyzed. Analysis results, Significant changes were observed in all terms of multicultural acceptance: diversity, relationships, universality. In particular, it has had a great effect on reducing stereotypes and discrimination in diversity areas. Religious education in public education has been taboo so far that it has not known much about other religions, and such ignorance has led to prejudice, rejection and fear. Until now, religious education has been dismissed as an individual's religious life, but religious education in a multicultural society is a necessary education to understand others. Through this religious education, we can foster religious tolerance and achieve multicultural coexistence. Expecting more religious education programs to be developed, I would like to suggest the following for future research on multicultural acceptance and the development and effectiveness of religious education programs based on the basis of the results of this study. First, religious education should be conducted more systematically and continuously as a topic of multicultural education. Second, it is necessary to develop various programs linked to more diverse subjects in follow-up studies. (Busan Bo-su Elementary School)
북한의 스피어피싱 탐지 도구로서 GPT-4기반 ChatGPT의 문장 분석 능력 활용 가능성 탐색
배재현(Jae-Hyeon Bae),명승환(SeungHwan Myeong) 한국정보통신학회 2024 한국정보통신학회논문지 Vol.28 No.1
본 논문은 초대규모 언어 모델인 GPT-4를 기반으로 동작하는 ChatGPT의 북한의 스피어피싱을 탐지할 가능성을 파악하는 것에 목적이 있다. 북한에서 발송된 스피어피싱 이메일을 수집하여 학습용으로 분류한 이메일을 ChatGPT를 통해 GPT-4에 입력하였다. 이 과정에서, 뒤집힌 상호작용 패턴으로 도출된 필요 정보를 입력하는 것으로 스피어 피싱을 학습하고 분류할 수 있도록 설계하였다. 추가적인 학습이 없이 사전에 학습된 데이터만으로 분류의 성능을 측정한 결과 F1 점수는 0.58, AUC 값은 0.62로 나타났으며, 초기화 및 학습을 진행한 이후 스피어피싱 이메일을 재분류하였다. 학습 이후의 결과는 F1 점수가 0.80, AUC 값이 0.88로, 사전 데이터 기반의 GPT-4만을 사용한 경우보다 향상된 것을 알 수 있었다. This paper aims to assess the potential of ChatGPT, which operates based on the large-scale language model GPT-4, in detecting spear-phishing from North Korea. Spear-phishing emails sent from North Korea were collected and categorized for training purposes, and then inputted into GPT-4 via ChatGPT. During this process, a flipped interaction pattern was designed to input the necessary information for learning and classifying spear-phishing. The performance of classification, measured without any additional training and only using pre-trained data, resulted in an F1 score of 0.58 and an AUC value of 0.62. After initializing and undergoing training, the spear-phishing emails were reclassified. The post-training results showed an improved F1 score of 0.80 and an AUC value of 0.88, indicating enhancement over using only the pre-data based GPT-4.
Track 5 : 정보과학영재; 식품첨가물 검색엔진 웹앱 개발
배재현 ( Jae Hyeon Bae ),홍창의 ( Chang Euy Hong ) 한국컴퓨터교육학회 2014 한국컴퓨터교육학회 학술발표대회논문집 Vol.18 No.1
식품첨가물이 표기되어 있지만 그 첨가물이 무엇인지 모르기 때문에 그냥 믿고 가공품을 사고 있지만 허용기준을 지키지 않거나 섭취불가한 첨가물 등으로 인한 좋지 않은 기사들을 볼 수 있다. 기존에 있는 검색을 사용하기 위해 내가 먹는 과자 상자에 있는 첨가물을 조회해 보았는데 내용이 너무 많아서 빠른 시간에 보기가 어렵고 내용 파악도 쉽지 않았다. 좀 더 간단하게 검색해 볼 수 있으면 좋겠다고 생각하여, 스마트폰에 식품첨가물의 정보를 잘 담아서 필요할 대에 바로바로 검색하여 정보를 알아볼 수 있도록 jQuery를 이용한 웹앱을 제작하였다.
채낚기 집어등 어선 주변에 유집된 살오징어, Todarodes pacificus의 분포 패턴
배재현 ( Jae-hyun Bae ),이경훈 ( Kyounghoon Lee ),조현정 ( Hyeon-jeong Jo ) 한국어업기술학회 2016 수산해양기술연구 Vol.52 No.3
This study investigated luring distributions by water layer of common squid which were targeted by angling fishing vessels equipped with LED and metal-halide lamps using a scientific echosounder with a 120 kHz frequency in order to develop energy-effective underwater fish aggregation devices. In the analysis, angles of a transducer were changed from 0° to 45° and were rotated every 10° horizontally. It was shown that common squid were densely distributed from the surface to 40 m and they were also distributed in directions of 10°∼+30°, -30°∼-60°, and -120°∼-130°with the head of vessel as the center. Comparative results of angles of transducer on acoustical densities of common squid distributing in 21~40 m water depth showed an average 101.8 m2/nm2 in vertical direction of 0°, 12.3 m2/nm2 in angle of 30°, and 42.4 m2/nm2 in angle of 45°, respectively. It implied that more considerations on acoustic scattering strength by incidence angle direction of the transducer and swimming oriental angle direction of common squid would be required.
고점도 용액 정밀토출을 위한 노즐 직경 및 표면젖음성 특성 연구
이상현(Sanghyun Lee),배재현(Jae Hyeon Bae),이상민(Sangmin Lee) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.12
Liquid dispensing systems are extensively used in various industries such as display, semiconductor, and battery manufacturing. Of the many types of dispensers, drop-on-demand piezoelectric jetting systems are widely used in semiconductor industries because of their ability to dispense minute volumes with high precision. However, due to the problems of nozzle clogging and undesirable dispensing behavior in these dispensers, which often result in device failure, the use of highly viscous fluids is limited. Accordingly, we studied the behaviors of droplet formation based on changes in viscosity. The effects of surface energy and the inner diameters of needle-type nozzles were also studied. Results showed that nozzles with lower surface energies reduced the ejection volume of droplets when a smaller nozzle diameter (0.21 mm in this study) was applied. These results indicate that the hydrophobic treatment of nozzle surfaces and the use of smaller nozzle diameters are critical factors enabling the use of highly viscous fluids in precision dispensing applications.