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조제웅(Jaewoong Cho),황경조(Gyengjo Hwang),서창호(Changho Suh) 대한전자공학회 2020 대한전자공학회 학술대회 Vol.2020 No.8
기계학습 분야의 빠른 발전과 함께 우리 삶의 많은 부분을 인공지능이 대체하기 시작했다. 특히, 최근에는 간단한 업무뿐만 아니라 채용 서류심사, 범죄자 형량 판단 등 중요한 업무까지 인공지능이 담당하면서, 성별/인종과 같은 민감한 속성에 따라 차별된 결정을 내리지 않는 것이 매우 중요한 사안이 되었다. 우리는 커널밀도추정 기반 공정한 분류기 학습 방법을 개발하였다. 본 논문은 이진분류문제와 두 가지 그룹 공정성 개념(demographic parity, equalized odds)에 초점을 맞추고 있으며 합성데이터 실험을 통해서 제안한 알고리즘이 기존 알고리즘들에 비해 예측 정확도-공정성 트레이드오프 측면에서 성능이 우수함을 입증하였다.
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(Ca0.96−xBax)MoO4:Eu0.04 3+ 분말 형광체의 형광특성 연구
이상민,김태현,황제웅,이성수 한국물리학회 2013 새물리 Vol.63 No.8
The conventional solid-state reaction method has been used to synthesize (Ca0.96−xBax) MoO4:Eu0.04 3+ phosphors. The effects of the host materials and changes in the sintering temperature on the microstructures of the (Ca0.96−xBax)MoO4:Eu0.04 3+ phosphors were measured by using X-ray diffraction (XRD) and field-emission scanning electron microscopy (FESEM). The luminescent characteristics were characterized by using photoluminescence excitation (PLE) and emission (PL) measurements. The dependences of various optical and morphological properties of the prepared materials on the host materials and on changes in the sintering temperature are discussed. Incorporation of Ba3+ ions into the (Ca0.96−xBax)MoO4:Eu0.04 3+ phosphors changed the crystallinity, the particle size and, hence, the luminescence properties, and the optimum concentration in the case of Ba3+ ions was found to be 0.25 mol. The photoluminescence intensity changed when the host materials and the sintering temperatures were changed. 고상반응법를 이용하여 Ba2+의 농도비를 달리한 (Ca0.96−xBax) MoO4:Eu0.04 3+ 분말 형광체를 각각800 ℃, 900 ℃ 및 1000℃ 소결온도에서 합성하였다. 모든 형광체 분말의결정 구조는 Ba2+의 소결온도와 농도비에 상관없이 주 회절 피크(112)면을 갖는 정방정계 구조이었으며, Ba2+의 농도비와소성온도에 따라 입자들의 크기도 전반적으로 증가하였다. 주여기스펙트럼은 소결온도에 따라 240 - 325 nm 파장영역에서 측정되었고발광스펙트럼은 소결온도에 따라 600 - 640 nm 파장에서 측정되었다. Ba2+농도가 0 mol 시료는 900 ℃에서, 0.25 mol 시료는 800 ℃에서 최대 발광스펙트럼이 관측되었다. 모체결정 조성비와 소결온도의 변화에 따라 분말의 결정성, 표면형상 및형광의 세기가 현저하게 변화되었으며, Ba2+ 조성비를 적절히변화시키면 소결온도가 낮아지고 형광효율은 향상되었다.
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다양한 발목각도에 따른 스쿼트 시 오른쪽 다리의 근 활성도 비교
안수홍,이수경,이광준,박진성,황제웅 대한고유수용성신경근촉진법학회 2017 PNF and Movement Vol.15 No.3
Purpose: This study aimed to compare muscle activities in the right leg during squatting on an angle-adjustable inclined wooden plate at three different angles. Methods: The subjects were 19 healthy adult men and women. An angle-adjustable inclined wooden plate was used for the experiment, and the subjects performed squatting at three adjusted angles of 0° ankle angle, 10° ankle flexion, and 10° plantar flexion. Squatting was randomly performed without a sequence. The knee angle was set at 45°, and a goniometer was used to measure the angles accurately. Electromyography was employed to measure and compare muscle activity in the right leg in each condition. The measured data were converted to root mean square values to calculate the muscle activities. Results: This study showed no statistically significant difference at a 0° ankle angle, but a statistically significant difference was found in the vastus medialis at 10° of ankle flexion. Moreover, statistically significant differences were observed in the vastus medialis and lateralis at 10° of plantar flexion. Conclusion: This study showed a statistically significant difference in the vastus medialis at 10° of ankle flexion and statistically significant differences in the vastus medialis and lateralis at 10° of plantar flexion. Therefore, it may be effective to perform squatting at 10° of ankle flexion when intending to selectively strengthen the vastus medialis and at 10° of plantar flexion when intending to strengthen both the vastus medialis and lateralis.
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사람의 유방암 세포주와 미성숙 랫드에서 정향피의 비스페놀 A 독성방어 효과
조은혜(Eun-Hye Jo),양세란(Se-Ran Yang),조성대(Sung-Dae Cho),정지원(Ji-Won Jung),박준석(Joon-Suk Park),황제웅(Jae-Woong Hwang),이성훈(Seong-Hun Lee),박정란(Jung-Ran Park),이영순(Yong-Soon Lee),강경선(Kyung-Sun Kang) 한국독성학회 2005 Toxicological Research Vol.21 No.1
The inhibitory activity against bisphenol-A (BPA), one of well-known endocrine disrupters was examined with the water extracts prepared from the Stem Bark of Syringa velutina (SBS). In this study, we have investigated the effect of SBS on the toxicity caused by BPA in human breast cancer cell line, MCF-7 cells and immature Sprague-Dawley rats. In the estrogen receptor-mediated proliferation assay using MCF-7 cells, BPA (16 ng/ml) induced the cell proliferation, but the water extract of SBS inhibited BPA-induced cell proliferation in a dose-dependent manner. These results are associated with PARP degradation and specific cleavage of anti-apoptotic protein Bcl-2 of apoptotic regulatory factors. Additionally, the BPA (400 mg/100 g) significantly induced the increase of the uterine and virginal weights, while SBS (50 mg/100 g) showed the inhibitory action against BPA, i.e. caused the increase of estrogen-related organ weights in immature rat uterotrophic assay. Taken together, the present data suggest that SBS may have anti-toxicity activities against BPA in vitro and in vivo systems. SBS may be capable of inhibiting adverse effects of BPA such as reproductive disorder.
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