An Improved Speech Processing Strategy for Cochlear Implants Based on an Active Nonlinear Filterbank Model of the Biological Cochlea

Kim $^$, Kyung Hwan,Choi, Sung Jin,Kim, Jin Ho,Kim, Doo Hee IEEE 2009 IEEE Transactions on Biomedical Engineering Vol.56 No.3

<P>The purpose of this study was to improve the speech processing strategy for cochlear implants (CIs) based on a nonlinear time-varying filter model of a biological cochlea. The level-dependent frequency response characteristic of the basilar membrane is known to produce robust formant representation and speech perception in noise. A dual resonance nonlinear (DRNL) model was adopted because it is simpler than other adaptive nonlinear models of the basilar membrane and can be readily incorporated into the CI speech processor. Spectral analysis showed that formant information is more saliently represented at the output of the proposed CI speech processor compared to the conventional strategy in noisy conditions. Acoustic simulation and hearing experiments showed that the DRNL-based nonlinear strategy improves speech performance in a speech-spectrum-shaped noise.</P>

Effect of low processing rate on homogeneous microstructural evolution of polyacrylonitrile‑based carbon fibers

Doo‑Won Kim,Dae Ho Kim,Sung Ryong Kim,Bo‑Hye Kim,Yun Hyuk Bang,Duck Joo Yang,Go Bong Choi,Yoong Ahm Kim,Kap Seung Yang 한국탄소학회 2019 Carbon Letters Vol.29 No.5

This study demonstrates that low processing rate for producing polyacrylonitrile (PAN)-based carbon fiber is a critical to obtain a homogeneous radial microstructure with high resistance to oxidation, thereby resulting in their improved mechanical strength. The dry-jet wet spun PAN organic fibers were processed (e.g., stabilized and then carbonized) utilizing two different rates; one is 1.6 times longer than the other. The effect of processing rate on the microstructural evolutions of carbon fibers was analyzed by scanning electron microscopy after slow etching in air, as well as Raman mapping after graphitization. The rapidly processed fiber exhibited the multilayered radial structure, which is caused by the radial direction stretching of the extrusion in the spinning. In case of the slowly processed fiber, the layered radial structure formed in the spinning process was changed into a more homogeneous radial microstructure. The slowly processed fibers showed higher oxidation resistance, higher mechanical properties, and higher crystallinity than the rapidly processed one. Raman mapping confirmed that the microstructure developed during spinning was sustained even though fiber was thermally treated up to 2800 °C.

발성법(發聲法)의 이론(理論)과 실제(實際)

김상두 ( Sang Doo Kim ) 건국대학교 교육연구소 1980 교사와 교육(구 교육논집) Vol.5 No.-

Voice production should be based on scientific principle. The science of voice production is a knowledge of certain phenomena of physical movements which are found under certain conditions to occur regularly and which produce certain definite effects. There is only one way to sing perfectly and that is the correct scientific way. All singing must of necessity be beautiful, first, last and always. Rather have it said that the voice is small and beautiful than loud and otherwise. The small beautifully placed voice is capable of portraying the full gamut of human emotions. Therefore, it is necessary to develop our own instrument, which is the vocal apparatus we rely upon to produce our own beautiful singing. When singing is most scientifically produced, and the voice soars out smothly, evenly and vibrantly with its resultant seeming effortless singing. The great fundamental objectives or principles in voice production are, proper posture, breath control, free tone, balanced, efficient ringing sonorous tone, and expressive and varied tone color. Proper posture is a fundamental for control and maximum success in any type of skill activity whether it be athletics or musical performance. Necessary physical development for singing begin with habituation of proper posture and continuss through breath development and strengthening of the vocal organs through singing and tonal exercises. Efficient daphragmatic-costal breath control is the great fundamental in singing. Breath control, or breath support, means to keep tone flowing evenly, freely and firmly. Freedom vitality, expressive tone color, variety, efficiency, sonority, and evenness in tonal production is also fundamental principle in singing. The first reguisite in tonal technic is freedom of production. It is vital that we learn to both hear and feel the difference between good and bad tone and, eventually, between the finest shades of discrimination.

예비체육교사의 패럴림픽에 대한 이해도 비교 연구

김상두(Sang Doo Kim),김준석(Jun Sik Kim) 한국사회체육학회 2014 한국사회체육학회지 Vol.0 No.57

The purpose of this study is to find out the level of understanding for pre-service physical-education teachers about the Paralympics and the differences between physical education majors and adapted physical education majors. For the purpose of the survey, a distinct difference between the groups on a survey has been identified. The survey material used for this study with a modification is based on Yeon-Sook Ko, Kyung-Sook Kim``s modified survey(2005) that scale analysis of disability attitude factor, which DFS(Disability Factor Scale) invented by Siller(1983) and translated by Jong-Nam Lee(1994), was used as a reference. For this study, collected 380 papers of information was updated and SPSS 18.0 program was used for its analysis with significant level of 5 percent or below. The frequency analysis has been conducted to figure out the subject``s general features, and t-test which is mean difference analysis and One-Way ANOVA have been conducted to see the awareness of the Paralympics. These tests were also used to verify differences between the two groups differentiated by major. The result are as followed. First, male have better understanding toward Paralympics than female do. However, none of statistical significance-difference was found. Second, the level of understanding toward Paralympics for all graders shows no sign of statistical significance-difference. Third, overall, adapted physical education majors have decent level of understanding toward Paralympics and the gap created from the fact, that whether he/she took adapted physical education classes, was shown. Fourth, a group with experience of volunteering turned out to have high level of understanding toward Paralympics and statistical significance-difference was found. It is shown that the differences about understanding toward Paralympics between the groups exist and pre-service physical-education teachers have lower level of understanding toward Paralympics compared to adapted physical-education majors. Fifth, the understanding level of pre-service physical-education teachers indicates areal gap and classes taken. In this study, a survey has been developed to find out the understanding level of Paralympics, which is one of the major events, for pre-service physical-education teachers and the differences between the groups have been identified. In this study which is to develop a survey as base line data to vitalize , it is suggested as followed. First, due to the fact that pre-service physical-education teachers were the subject for this study, an additionalstudy for a group of teachers who are currently working in the field should be made. Second, this study is only for major events of disabled for Paralympics. Later on, hence, study including morefeatures is a mandatory, such as various games, domestic sports festival for the people with handicapped. Third, due to this study is focused on pre-service physical education teacher, later, research which is forspecial education teacher should be needed for their better physical education service.

Factored MLLR Adaptation

Nam Soo Kim,June Sig Sung,Doo Hwa Hong IEEE 2011 IEEE signal processing letters Vol.18 No.2

<P>One of the most popular approaches to parameter adaptation in hidden Markov model (HMM) based systems is the maximum likelihood linear regression (MLLR) technique. In this letter, we extend MLLR to factored MLLR (FMLLR) in which the MLLR parameters depend on a continuous-valued control vector. Since it is practically impossible to estimate the MLLR parameters for each control vector separately, we propose a compact parametric form of the MLLR parameters. In the proposed approach, each MLLR parameter is represented as an inner product between a regression vector and transformed control vector. We present an algorithm to train the FMLLR parameters based on a general framework of the expectation-maximization (EM) algorithm. The proposed approach is applied to adapt the HMM parameters obtained from a database of reading-style speech to singing-style voices while treating the pitches and durations extracted from the musical notes as the control vectors. This enables to efficiently construct a singing voice synthesizer with only a small amount of singing data.</P>

Solar Cells: Amorphous Zinc Stannate (Zn₂SnO₄) Nanofibers Networks as Photoelectrodes for Organic Dye‐Sensitized Solar Cells (Adv. Funct. Mater. 25/2013)

Choi, Seung‐,Hoon,Hwang, Daesub,Kim, Dong‐,Young,Kervella, Yann,Maldivi, Pascale,Jang, Sung‐,Yeon,Demadrille, Renaud,Kim, Il‐,Doo WILEY‐VCH Verlag 2013 Advanced Functional Materials Vol.23 No.25

<P>Highly porous amorphous Zn<SUB>2</SUB>SnO<SUB>4</SUB> electrodes are prepared using electrospinning techniques and combined with organic or ruthenium dyes to fabricate dye‐sensitized solar cells. As reported by Sung‐Yeon Jang, Renaud Demadrille, Il‐Doo Kim, and co‐workers on page 3146, the devices based on 3‐μm‐thick electrodes and the organic dyes demonstrate significantly improved performances compared to those using the ruthenium complex. Using this approach, solar cells with power conversion efficiencies up to 3.7% are obtained. </P>

Evaluation of absorbed dose in monkey and mouse using ¹⁸F-FDG PET and CT density information

Kim, Wook,Lee, Yong Jin,Park, Yong Sung,Cho, Doo-Wan,Lee, Hong-Soo,Han, Su-Cheol,Kang, Joo Hyun,Woo, Sang-Keun Korean Society of Radiopharmaceuticals and Molecul 2017 Journal of radiopharmaceuticals and molecular prob Vol.3 No.1

Patient-specific image-based internal dosimetry involves using the patient's individual anatomy and spatial distribution of radioactivity over time to obtain an absorbed dose calculation. Individual absorbed dose was calculated by accumulated activity multiply S-value of each organs. The aim of this study was to calculate the S-values using Monte Carlo simulation in monkey and mouse and evaluation of absorbed dose in each organ. Self-irradiation S-value of monkey heart self-irradiation was 3.15E-03 mGy-g/MBq-s, lung self-irradiation was 8.94E-04 mGy-g/MBq-s and liver self-irradiation S-value was 2.23E-03 mGy-g/MBq-s. Mouse heart self-irradiation S-value was 1.95E-01 mGy-g/MBq-s, lung was 9.59E-02 mGy-g/MBq-s, and liver was 1.40E-03 mGy-g/MBq-s. The results of this study show that the calculation protocol of image based individual absorbed dose of each organ using Monte Carlo simulation. Therefore, this study may be applied to calculate human specific absorbed dose.

A New Approach to Statistical Analysis of Electrical Fire and Classification of Electrical Fire Causes

( Doo Hyun Kim ),( Jong Ho Lee ),( Sung Chul Kim ) 한국안전학회(구-한국산업안전학회) 2007 International Journal of Safety Vol.6 No.2

This paper aims at the statistical analysis of electrical fire and classification of electrical fire causes to collect electrical fires data efficiently. Electrical fire statistics are produced to monitor the number and characteristics of fires attended by fire fighters, including the causes and effects of fire so that action can be taken to reduce the human and financial cost of fire. Electrical fires make up the majority of fires in Korea(including nearly 30% of total fires according to recent figures), The incorrect and biased knowledge for electrical fires changed the classification of certain types of fires, from non-electrical to electrical. It is convenient and required to develop the standardized form that makes, in the assessment of the cause of electrical fires, the fire fighters directly ticking the appropriate box on the fire report form or making an assessment of a text description. Therefore, it is highly recommended to develop electrical fire cause classification and electrical fire assessment on the fire statistics in order to categorize and assess electrical fires exactly. In this paper newly developed electrical fire cause classification structure, which is well-defined hierarchical structure so that there are not any relationship or overlap between cause categories, is suggested. Also fire statistics systems of foreign countries are introduced and compared.

Purification and characterization of trypsin from transgenic rice cell suspension culture

Sung-Kun YIM,Eun-Sun JEUNG,Yun-Ji SHIN,Hyo-Boon KIM,Ju KIM,Hong-Soo DOO,Ji-Ae YANG,Min-Woo NAM,Moon-Sik YANG,Tea-Ho KWON 한국생물공학회 2010 한국생물공학회 학술대회 Vol.2010 No.10

Two cases of gastrointestinal arteriovenous malformation presented as bleeding in elderly patients (초)

Doo Hyun Baek,Hye Kyung Jung,Jae Jung Park,Sung Ae Jung,Young Wook Noh,Sung Chul Hong,Min Jung Kang,Ji Min Jung,Seong Eun Kim,Ki Nam Shim,Tae Hun Kim,Kwon Yoo,Il Hwan Moon 대한내과학회 2009 대한내과학회지 Vol.77 No.4S