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신보라(Bo-Ra Shin),이석필(Soek-Pil Lee) 대한전기학회 2018 전기학회논문지 Vol.67 No.10
Speech emotion recognition, which aims to classify speaker’s emotional states through speech signals, is one of the essential tasks for making Human-machine interaction (HMI) more natural and realistic. Voice expressions are one of the main information channels in interpersonal communication. However, existing speech emotion recognition technology has not achieved satisfactory performances, probably because of the lack of effective emotion-related features. This paper provides a survey on various features used for speech emotional recognition and discusses which features or which combinations of the features are valuable and meaningful for the emotional recognition classification. The main aim of this paper is to discuss and compare various approaches used for feature extraction and to propose a basis for extracting useful features in order to improve SER performance.
한국 현대회화에서 백색의 의미론 - 1970년대 단색조 회화를 중심으로 -
신보라 ( Bo Ra Shin ) 중앙대학교 예술문화연구원 2020 예술문화융합연구 Vol.13 No.-
The purpose of this research is to analyze the origins of the color ‘White’ in Korea, the meaning that the color ‘White’ has specifically in Korea, and how the origins and the meaning of the color affect the use of the color ‘White’ in modem Korean paintings especially in 1970’s Dansaekhwa movement. The conclusions are as follows. First, the meaning and value of the color ‘White’ are different from the meanings and values of all the other colors in Korea. Koreans have been called ‘the People of White Clothes’ for centuries and their preference for the color ‘White’ also naturally appears in their art world. Since the Open-Door Policy of the Joseon Dynasty, art in Korea has gone through a period of dramatic changes with the other aspects of Korea. Decades after the open-door policy, a recognizable movement of Korean art called ‘Danseakhwa’, or ‘Monochrome Pairing’ appeared and became known to represent Korea’s identity. With the studies that had been done by domestic and foreign scholars, the Dansaekhwa movement has earned its importance on twentieth-century Asian art, and contemporary art in general. Second, the color ‘White’ is considered one of the characteristics of Dansaekhwa, and its meaning in the art movement is not only what the color represents, but also the invisible factor, such as tradition and spirituality that the color has among Koreans. Third, Dansaekhwa artists in the 1970’s used the actual materials that form their everyday objects and used achromatic colors that resonated with their daily lives. Seo-bo Park, Seung-Won Suh, and Young-Woo Kwon are the leading artists of the 1970’s Dansaekhwa movement and their artworks are known for being created using the materials that reveal Korea’s identity implicitly. In addition, the overlapping of repetitive actions and colors in the process of creating works is defined as a space of creation beyond the traces and traces of existence, which became the key aspects of the monochrome movement in the 1970‘s. This study aims to achieve a narrow and accurate view of the color White’ and to rearrange and rediscover the color ‘White’ in Korean culture and art.
신보라 ( Bo-ra Shin ),김수빈 ( Su-bin Kim ),( Wirasembada Yanuar Chandra ),조진우 ( Jin-woo Cho ) 한국폐기물자원순환학회(구 한국폐기물학회) 2021 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2021 No.-
수소발효공정(Hydrogen Fermentation, HF)은 혐기소화공정의 Hydrolysis, Acidogenesis, Acetogenesis, Methanogenesis 과정 중 휘발성지방산(VFAs)와 H<sub>2</sub>를 CH<sub>4</sub>로 전환되는 Methanogenesis 과정을 억제하여 수소를 생산한다. 복잡한 고분자 형태의 유기물은 가수분해과정을 거쳐 단순한 유기단량체로 분해되고, 산생성균에 의해 Acetic acid, Propionic acid, Isobutyric acid, Butyric acid, valeric acid, IsoValeric acid와 같은 휘발성지방산 (Volatile Fatty Acids)로 발효된다. 이 과정에서 수소가 생산된다. 산발효조의 pH는 수소생산에 큰 영향을 미친다. Mizuno의 연구에서는 H<sub>2</sub>의 생산이 증가할수록 VFAs가 많이 생성되며, 수소생산을 위한 최적 pH는 5.5로 보고되었다. Lay의 연구에서 가장 높은 수소생산비(1.47 mol H<sub>2</sub>/ mol hexose)는 pH 5.2에서 발생하였고 pH<sub>4</sub> 미만에서는 산생성균의 활성이 나타나지 않았다고 하였다. D.Infantes의 연구에서는 해리되지 않은 VFA의 누적에 의해 pH가 감소되며, 이로 인해 산생성균의 활성이 저하된다고 보고되었다. 따라서 수소생산을 증가시키기 위해, 수소발효공정에서 누적되는 VFAs의 일부를 제거함으로써 pH감소를 막고, 수소생산미생물의 활성도를 유지시킬 수 있다. 본 연구에서는 막증발공정(Membrane distillation, MD)을 통하여 산생성 반응조의 유출수 내존재하는 VFAs를 제어하고자 하였다. 막증발공정은 분리막 양쪽에 온도차로 인해 발생되는 증기압차에 의해 기화 된 물이 막을 통과하는 원리로 구동된다. Direct Contact Membrane distillation(DCMD) 형태의 LAb 규모 장치를 제작하고, 유입수의 다양한 pH에 따라 VFAs의 투과율과 플럭스(Flux)를 확인하고자 하였다.
침탄강 SCr420에서의 템퍼링 온도와 미세구조에 따른 마멸 특성
신보라(Bo-Ra Shin),이규선(Gyu-Sun Lee),이영제(Young-Ze Lee) 한국트라이볼로지학회 2008 한국트라이볼로지학회 학술대회 Vol.2008 No.6
In this paper the ball-on-disk type sliding wear tests were carried out to verify influence of tempering temperature and microstructure on wear properties of carburizing SCr420 steel. The specimens of various hardness with retained austenite's existence and nonexistence were fabricated by heat treatment. Retained austenite was nondestructively analyzed with Optical Microscope. The result showed that the wear volume of specimens depended on not the existence and nonexistence of retained austenite but surface hardness.
바이오수소 생산을 위한 2단 혐기발효공정의 초기거동 연구
( Wirasembada Yanuar Chandra ),신보라 ( Bo-ra Shin ),조진우 ( Jin-woo Cho ) 한국폐기물자원순환학회(구 한국폐기물학회) 2021 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2021 No.-
For last decades, two-stage anaerobic fermentation system (TSAF) has been frequently applied to produce hydrogen and methane using various organic substrates or wastes. In this study, the performance of a TSAF reactor using high-strength synthetic wastewater as a substrate was investigated. The TSAF system consisted of two identical reactors: acidogenic reactor as the first stage (pH 5.5 ± 0.5, 37 C ± 3) and methanogenic reactor as the second stage (pH 6.5 ± 5.5, 37 C ± 3). The first hydrogen production was detected at 10th day where the maximum concentration of 38.24% was detected on 40th day when the pH stable around 5.52. On the other hand, the first methane production was detected at 31st day where the maximum concentration of 48.63% was detected on day 58th when the pH stood at 6.27. The hydrogen and methane still detected until the last day (60th day) with average percentage value of 14.57% and 26.20% respectively. Under a long and constant HRT (15 days in the first stage and 30 days at the second stage), maximum hydrogen yield of 0.87 mol H<sub>2</sub>/mol glucose and hydrogen production rate (HPR) 0.092 L/L/d while methane yield of 0.58 mol CH<sub>4</sub>/mol glucose and methane production rate (MPR) 0.51 L/L/d was obtained.