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전기투석 시스템에서 고농도 수용액의 한계 농축에 대한 연구
장준수 ( Junsu Jang ),김범주 ( Bumjoo Kim ) 한국공업화학회 2023 공업화학 Vol.34 No.1
전기투석에서 농축 공정은 전기 에너지를 이용하여 전해질 수용액 상의 이온의 농도를 증가시키는 기술로, 이온교환막에서 일어나는 이온과 물 분자의 전달 현상에 대해 많은 연구들이 진행되고 있다. 본 연구에서는 전기투석 시스템에서 고농도 전해질 수용액의 전기 삼투에 의한 농축 현상에 대한 실험을 통해 한계 농축 현상에 대한 변수를 분석한다. 두 가지 전해질 수용액(NaCl 2M / 4M)에 대해 이온과 물 분자의 투과량을 측정해 전기 삼투 현상을 분석하였고, 농축조 대비 탈염조의 부피 비에 따른 한계 농축 현상을 관찰하였다. 실험 결과, 전해질 수용액의 농도가 높을수록 전기 삼투가 감소하였고, 부피 비가 클수록 탈염수의 농도가 높게 유지되기 때문에 한계 농축 농도가 증가하고 비에너지 소모가 감소됨을 확인하였다. The salt concentration process in electrodialysis, which uses electrical energy to enhance ion concentrations in an aqueous electrolyte solution, has been studied on the transfer phenomenon of ions and water molecules over the ion exchange membrane. In this paper, we investigated various parameters for limiting concentration of electrolyte solution and the electroosmosis phenomenon in an electrodialysis system by varying salt concentration of electrolyte solution. The electroosmotic water transport was analyzed by measuring the ions and water fluxes in electrolyte solutions having two different NaCl concentrations (NaCl 2M/4M), and concentration change was observed for various volume ratios of the diluted reservoir to the concentration one As a result, it was found that the higher concentration of the aqueous electrolyte solution, the lower electroosmosis, and the higher volume ratio led to a higher concentration in the dilute reservoir, so the limiting concentration was enhanced and the specific energy consumption decreased.
송승규(Song, Seungkyu),김종열(Kim, Jongyeol),장준수(Jang, Junsu),권철홍(Kwon, Chulhong) 한국음성학회 2013 말소리와 음성과학 Vol.5 No.1
This study proposes a method to measure mental fatigue using speech technology, which has not been used in previous research and is easier than existing complex and difficult methods. It aims at establishing a relationship between the human voice and mental fatigue based on experiments to measure the influence of mental fatigue on the human voice. Two monotonous tasks of simple calculation such as finding the sum of three one digit numbers were used to measure the feeling of monotony and two sets of subjective questionnaires were used to measure mental fatigue. While thirty subjects perform the experiment, responses to the questionnaire and speech data were collected. Speech features related to speech source and the vocal tract filter were extracted from the speech data. According to the results, speech parameters deeply related to mental fatigue are a mean and standard deviation of fundamental frequency, jitter, and shimmer. This study shows that speech technology is a useful method for measuring mental fatigue.
목소리 특성의 청취 평가에 기초한 사상체질과 음성 특징의 상관관계 분석
권철홍(Kwon, Chulhong),김종열(Kim, Jongyeol),김근호(Kim, Keunho),장준수(Jang, Junsu) 한국음성학회 2012 말소리와 음성과학 Vol.4 No.4
Sasang constitution experts utilize voice characteristics as an auxiliary measure for deciding a person"s constitutional group. This study aims at establishing a relationship between speech features and the constitutional groups by subjective listening evaluation of voice characteristics. A speech database of 841 speakers whose constitutional groups have been already diagnosed by Sasang constitution experts was constructed. Speech features related to speech source and vocal tract filter were extracted from five vowels and one sentence. Statistically significant speech features for classifying the groups were analyzed using SPSS. The features contributed to constitution classification were speaking rate, Energy, A1, A2, A3, H1, H2, H4, CPP for males in their 20s, F0_mean, CPP, SPI, HNR, Shimmer, Energy, A1, A2, A3, H1, H2, H4 for females in their 20s, Energy, A1, A2, A3, H1, H2, H4, CPP for male in the 60s, and Jitter, HNR, CPP, SPI for females in their 60s. Experimental results show that speech technology is useful in classifying constitutional groups.