T-S 퍼지 모델을 이용한 PMSM의 속도제어

황태환(Tae-Hwan Hwang),강요한(John Kang),박승규(Seung-Kyu Park),안호균(Ho-Kyun Ahn) 대한전기학회 2013 대한전기학회 학술대회 논문집 Vol.2013 No.7

라벨링오류에 강인한 CNN 모델 학습기법

황태환(Hwang Tae Hwan),백재순(Baik Jae Soon),이준호(Lee Jun Ho),박건율(Park Kon Yul),최준원(Choi Jun Won) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.6

본 논문은 노이즈 레이블이 섞인 데이터세트에 대해 오직 한개의 네트워크만 사용하여 강인한 학습을 하는 기법을 제안한다. 제안된 방법은 학습단계에서 알맞게 라벨링된 샘플을 알아내기 위해 두 종류의 샘플 선택 기준을 사용한다. 첫번째 기준은 이전 시간들의 모델 앙상블의 손실함수값이다. 시간적으로 분리된 모델 앙상블을 만들기 위해 주기적 학습률을 적용한다. 이전 시간적 앙상블에 대한 손실함수값은 깨끗한 샘플을 감지하는 기준을 제공한다. 두 번째 기준은, 데이터 변형을 적용하여 다시점으로 예측을 하게하여, 이 예측들의 일치가 학습과 샘플 선택을 하는데 둘다 사용되게 한다. 이러한 기준들을 같이 사용함으로 써 알맞게 라벨링된 샘플을 정확하게 감지할 수 있고, 여러 개의 네트워크를 사용한 방법보다 더 나은 성능을 도달할 수 있다. 본 연구는 CIFAR-10, CIFAR-100, MNIST 등 일반적으로 널리 사용되는 데이터세트를 이용하여 수행되었으며, 기존 방법들에 비해 높은 성능을 도출하는 것을 확인하였다.

증설(證說) : 포황(蒲黃)의 독성(毒性)과 부작용에 관한 문헌적 고찰

황태환 ( Tae Hwan Hwang ),김종대 ( Jong Dae Kim ),노성수 ( Seong Soo Roh ),서부일 ( Bu Il Seo ) 대구한의대학교 제한동의학술원 2011 東西醫學 Vol.36 No.3

Typhae Pollen is in use in eastern medicine. Eastern medical doctors use Typhae Pollen for removing heat from the blood to stop bleeding(凉血止血), activating blood flow and removing blood stasis(活血祛瘀), etc. We investigated toxicity, poisoning symptoms, side effect, poisoning treatment and prevention against poisoning of Typhae Pollen. The results were summarized as follows:1. Typhae Pollen mainly cause the decrease of appetite, inconvenience of stomach part for side effects, etc. And when the patients use the powder of Typhae Pollen for external use, the allergic reaction on the skin can be showed up. 2. If the patient has a slight poisoning reactions or side effects, the symptoms are disappeared automatically with the lapse of time. 3. In order to prevent against poisoning of Typhae Pollen, the patients should keep usage, dosage and notes.

가중적분을 이용한 IPMSM 의 T-S 퍼지 제어

황태환(Tae Hwan Hwang),김태규(Tae Kue Kim),박승규(Seung Kyu Park),안호균(Ho Gyun Ahn),윤태성(Tae Sung Yoon),곽군평(Gun Pyong Kwak) Korean Society for Precision Engineering 2014 한국정밀공학회지 Vol.31 No.2

This paper proposes a novel H∞ T-S Fuzzy controller with a weighted integral action for Interior Permanent Magnet Synchronous Motor(IPMSM) which have nonlinear dynamics. The H∞ T-S Fuzzy controller is used for the robustness of nonlinear systems and the weighted integral action is used for the tracking problem and the improvement of control performance. A T-S Fuzzy controller is designed by combining the local controllers with the overall stability, and LMI(Linear Matrix Inequality)is used to determine the gains of linear controllers. The tracking problem of IPMSM is changed into regulator problem by introducing the integral action and the weighting factor gives flexibility to a H∞ fuzzy controller.

Isocycloseram: New novel insecticide and acaricide

taehwan.hwang(황태환) 한국농약과학회 2022 한국농약과학회 학술발표대회 논문집 Vol.2022 No.11

정보전 개념

권태환(Taehwan Kwon),황호상(Hosang Hwang) 한국정보보호학회 2002 情報保護學會誌 Vol.12 No.6

산양유의 산업적 이용 가치에 대한 연구 고찰

정태환 ( Tae-hwan Jung ),황효정 ( Hyo-jeong Hwang ),윤숭섭 ( Sung-seob Yun ),이원재 ( Won-jae Lee ),김진욱 ( Jin-wook Kim ),신경옥 ( Kyung-ok Shin ),한경식 ( Kyoung-sik Han ) 한국유가공기술과학회 2016 Journal of Dairy Science and Biotechnology (JMSB) Vol.34 No.3

In many countries, goat milk is an excellent nutrient source and is less allergenic for children and the elderly. The casein composition of goat milk consists largely of β-casein and lower amounts of α_s1-casein, which may interfere with digestion by forming solid curds in the human stomach. Goat milk contains small fat globules and large amounts of medium chain fatty acids for, better digestibility, as well as abundant minerals and vitamins with high absorption rates. Recently, the medical benefits of goat milk in different human disorders have been recognized, leading to an increased interest in developing functional foods with goat milk, particularly for individuals with malabsorption syndrome. However, the physiological and biochemical properties of goat milk are largely unknown. We review the importance of goat milk as a potential functional food by providing scientific evidence confirming its health benefits.

삼나무 (杉) 내한성 (耐寒性) 품종 선발에 관한 연구

홍성각,조태환,황증 ( Sung Gak Hong,Tae Hwan Cho,Jeung Hwang ) 한국산림과학회 1981 한국산림과학회지 Vol.51 No.1

This study was designed to know difference in degree of dehardening and rehardening respectively by artificial high and low temperature treatments among different clonal seedlings and seedlings from different seed sources of Cryptomeria japonica which have been grown under the cold areas in Japan and Korea. High temperature treatment was done with 15 to 20℃ under 100% relative humidity for one to nine days and low temperature treatment was carried with -7℃ for one to three days. Occasionaly, high temperature treatment was combined and followed by low temperature treatment. The ability of stem section to delay dehardening by high temperature treatment and/or to hasten rehardening by low temperature treatment was used as an indicator of adaptability under extreme temperature fluctuation in nature. Clones and seedlings from different seed sources which showed greater freezing resistance than others after artificial high and/or low temperature treatments were selected over two to three time periods: early winter, mid winter and early spring in 1977 to 1980. These were Seoul #7, and #9, Namboo #3, and #4, Sung-Kang #11, Chung-Sam #8 and Huek-Suk #9. These selected seedlings might have survival advantage to withstand early and late frost damage, especially the critical frost damage of the basal stem, since it was known to be induced by lowering freezing resistance of the basal part when exposed to the high temperature near the ground during the day. Large variation in freezing resistance and degree of dehardening and rehardening was found among clonal or seed sources and among individuals within a seed source, but was not related to the difference in climatic conditions where the parent trees was selected. These indicated the possibility of future breeding work for more cold resistant family of Cryptomeria japonica.

베이지안 확률적 접근법을 이용한 건설업체 부도 예측에 관한 연구

홍성문,황재연,권태환,김주형,김재준,Hong, Sungmoon,Hwang, Jaeyeon,Kwon, Taewhan,Kim, Juhyung,Kim, Jaejun 한국건설관리학회 2016 건설관리 : 한국건설관리학회 학회지 Vol.17 No.5

주수급자 역할을 하는 건설기업의 부실화는 발주자에게 공사계약 미이행에 따른 피해를 초래할 수 있고, 전문건설업체 및 자재공급업체의 재무건전성에 악영향을 줄 수 있다. 건설업은 프로젝트를 수주하고 진도에 따라 기성을 받는 현금흐름의 재무적 특성이 존재하고, 사업 진행 중의 부실화는 투입한 자금의 손실로 이어질 수 있으므로 건설업체의 부실화 예측은 중요하다. 국내 건설업체의 부실화 예측은 90년도 초 미국에서 개발된 KMV (Kealhofer McQuown and Vasicek)사의 KMV모형으로 수행되는 경우도 있지만, 이 모형은 일반적인 기업 및 은행의 신용위험 평가에 개발되어져 건설기업 예측력에는 부족함이 있다. 또한, KMV값의 부도확률 예측력에 대해서는 분석대상의 기업수 및 데이터의 부족으로 의문점이 지속적으로 제기되고 있다. 따라서 이러한 의문점을 해결하기 위해 기존 부도예측확률모형에 베이지안 확률적 접근법(Bayesian Probabilistic Approach)을 접목하고자 한다. 베이즈 통계학의 사전확률(Prior Probability)만 적절하게 예측가능하다면 적은 정보라도 증거에 대한 조건부 획득으로 신뢰성 있는 사후확률(Posterior Probability)을 예측할 수 있기 때문이다. 이에 본 연구에서는 기존 부도예측확률모형에 베이지안 확률적 접근법을 활용하여 예상부도확률(Expected Default Frequency, EDF)을 측정하고, 기존 모형의 예상부도확률과 비교하여 정확성을 예측하고자 한다. Insolvency of construction companies that play the role of main contractors can lead to clients' losses due to non-fulfillment of construction contracts, and it can have negative effects on the financial soundness of construction companies and suppliers. The construction industry has the cash flow financial characteristic of receiving a project and getting payment based on the progress of the construction. As such, insolvency during project progress can lead to financial losses, which is why the prediction of construction companies is so important. The prediction of insolvency of Korean construction companies are often made through the KMV model from the KMV (Kealhofer McQuown and Vasicek) Company developed in the U.S. during the early 90s, but this model is insufficient in predicting construction companies because it was developed based on credit risk assessment of general companies and banks. In addition, the predictive performance of KMV value's insolvency probability is continuously being questioned due to lack of number of analyzed companies and data. Therefore, in order to resolve such issues, the Bayesian Probabilistic Approach is to be combined with the existing insolvency predictive probability model. This is because if the Prior Probability of Bayesian statistics can be appropriately predicted, reliable Posterior Probability can be predicted through ensured conditionality on the evidence despite the lack of data. Thus, this study is to measure the Expected Default Frequency (EDF) by utilizing the Bayesian Probabilistic Approach with the existing insolvency predictive probability model and predict the accuracy by comparing the result with the EDF of the existing model.

버찌, 아로니아, 마키베리의 성분 및 항산화 활성 비교 연구

이기원,제해종,정태환,이유림,최재환,황효정,신경옥,Lee, Ki-Won,Je, Haejong,Jung, Tae-Hwan,Lee, Yu lim,Choi, Jae-Hwan,Hwang, Hyo-Jeong,Shin, Kyung-Ok 한국식품영양학회 2018 韓國食品營養學會誌 Vol.31 No.5

This study was performed to facilitate development of new food materials by comparing general components, functional components and antioxidant activity of cherry, aronia, and maquiberry. Cherry revealed higher content of water (6.71%), crude protein (4.61%) and crude protein (5.33%) than aronia and maquiberry. Crude fat content of cherry fruits was the lowest at 1.46%. Content of iron per 100 g was 0.96 mg in cherry, significantly higher than other berries. Total phenolic content of cherry, aronia and maquiberry was 31.32~95.05 GAE mg/g. Total flavonoid content in water extract was 2.07 QE mg/g in cherry, compared with aronia and maquiberry. FRAP reduction power of cherry, aronia and maquiberry was $86.94{\sim}331.83TEAC\;{\mu}mol/g$. FRAP reduction power ($156.50TEAC\;{\mu}mol/g$) of cherry was higher than that of aronia ($121.72TEAC\;{\mu}mol/g$) at $95^{\circ}C$ deionized water extract. In the case of water extract, $117.00TEAC\;{\mu}mol/g$, and cherry was higher in ABTS radical scavenging ability than aronia ($86.55{\mu}mol/g$). DPPH radical scavenging activity of cherry, aronia and maquiberry was $26.34{\sim}493.53TEAC\;{\mu}mol/g$. DPPH radical scavenging activity was lowest in cherry. In conclusion, in place of foreign expensive aronia and maquiberry, the price of cherry is low and use of cherry widely distributed has increased and is used as a material of functional food.