새조개 처리동결 가공부산물을 이용한 페이스트 젓갈의 품질 및 저장안정성

손정호,강훈이,김명희,하정자,강동수,조영철 여수대학교 1997 論文集 Vol.11 No.2

A fermented squeezed-type paste was manufactured for the purpose of effective utilization of cockle shell by-product, and their rheological properties, texture and storage stability were investigated. The contents of moisture, portein, lipid, carbohydrate and ash in the fermented product were 57.7%, 3.2%, 2.4%, 17.6% and 19.3%, respetively. When storage at 90 days, the contents of chemical composition were little changed. During the storage period, pH and salinity were 6.3~6.6 and 20.3~20.65%. And the product was stable for the storage of 60 days at 23±3℃ on bacterial growth. The major free amino acid in the product were glutamic acid, lysine, leucine, valine and aspartic acid. And during the storage period, orders and contents of amino acid composition were not changed compared with 0 day storage. Thus, fermented squeeze-type cockle shell by-product paste were stable that decomposition was not continued at storage period.

진화전략과 상태 관측기에 의한 영구자석 동기전동기의 센서리스 속도제어기 설계에 관한 연구

손문경,이동희,오석규 진주산업대학교 1999 산업과학기술연구소보 Vol.- No.6

Permanent magnet synchronous motor is widely applied for the industrial and home appliance because of it`s high power density and easy control. Recently sensorless speed control of PMSM is much studied because a mechanical sensor reduces reliability and increases cost. This paper investigates sensorless controller design of PMSM. Angular speed and position are estimated with observer. In order to reduce variation effect of mechanical parameters and calculation delay, reduced order state observer is designed with electrical parameters. Evolution strategy is used to optimize controller gains and observer eigenvalue. In the sensorless control of PMSM with state observer, eigenvalue affect stability and dynamic response of system,. The simulation and experimental results indicate good performances.

상태관측기를 이용한 영구자석 동기전동기의 센서리스 속도제어

손문경,이동희,오석규 진주산업대학교 1999 산업과학기술연구소보 Vol.- No.6

Sensorless PMSM is much studied for the industrial applications and home appliances because a mechanical sensor reduces reliability and increases cost. This paper investigates a field oriented control method without speed and rotor position sensor using the state observer. The observer is based on the model of the motor represented in the stationary two-axes coordinates. The control strategy is to estimate back-EMF by the state observer and to estimate the rotor speed and the rotor position angle from the estimated back-EMF. And we construct back-EMF constant compensator to compensate estimated speed error due to detuned electrical parameter. The observer is tested by simulation and experiment. The results show that the observer gives a good estimation of speed and rotor position, compensated parameter constants. The simulation and experimental results indicate good performances.

소규모사업장 용접근로자들의 소음·용접흄·망간 노출에 관한 연구

김동구,문덕환,이채관,박명희,함성애,손병철,김대환,이창희,김휘동,이채언 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.5

Objective : This study was conducted for the purpose of investigating the level exposure of welders to noise, welding fume and Manganese(Mn) related to this process. Methods and Material : All subjects in this study were welders engaged in CO2 arc and coated arc welding process especially in small-scale enterprises classified by type of manufacture of ship building, repairing and of other fabricated metal products, which is located in Gimhae and Milyang of Kyeongsang province in south Korea. Air sampling of welding fume was measured, shipped and analyzed on the basis of national institute for occupational safety and health(NIOSH) method in U.S. and work environment measurement method established in south Korea. To measure Noise in the work environment, Noise dosimeter was used on the basis of work environment measurement method established in south Korea. Result : This study was performed during a period from January, 2000 to December, 2001 and Results were as follows: 1. Noise level measured in this work environment was higher than national criteria for permissible exposure limit on health examinations related to hearing loss. 2. The concentration of welding fume and Mn in manufacture of ship building and repairing was higher than those in manufacture of other fabricated metal products. 3. In conditions of existing in ventilation system installed and operated, the concentration of welding fume and Mn was slightly lower than those of not existing. 4. In conditions of existing in sufficient air supply from out door into the work place relied on natural exhaust system, the concentration of welding fume and Mn was slightly lower than those of in not sufficient. 5. In all subjects, a rate of wearing ear plug and respiratory mask for dust and fume was lower than that of not wearing. Conclusion : According to above results, this study suggests that more positive work environment managements such as the use of portable local ventilation system, the supply of highly qualified personal protective equipment, and consecutive education and training related to health protection should be need to acquire suitable health protection program for welders engaged in small-scale enterprises in Korea.

일괄공정 압저항혈 압력센서의 특성

서희돈,이동원,손미정,최세곤 嶺南大學校 工業技術硏究所 1998 工業技術硏究所論文集 Vol.26 No.1

This paper describes structural characteristics of three kinds of piezoresistive pressure sensors, which include wheatstone-bridge type, center-boss type and single-element type, fabricated on one-chip by batch process. In order to optimize device dimensions with respect to the desired characteristics, analytical formula and finited-element modeling(FEM) are used in design process. In experiments the pressure sensitivity of wheatstone-bridge type is about 2.2㎷/V·㎪. The fabricated center-boss pressure sensor has improved in the characteristics as linearity at low pressure, and sensitivity is about 2.415㎷/V·㎪. In single-element type with a four-terminal gauge using shear stress, the maximum sensitivity about 0.4㎷/V·㎪ appeared at the center of the diaphragm with the 3:1 of the length : width ratio. this type is very appropriate method to minimize the temperature dependance of the offset voltage and sensitivity, because the fabricated sensors reduce the offset of themal stress and mismatch of piezoresistros as compared with the wheatstone-bridge type.

?? 이종접합구조에 대한 격자이완 및 결정성의 변화

이동건,김종수,손정식,배인호,문영희 嶺南大學校 基礎科學 硏究所 1998 基礎科學硏究 Vol.18 No.-

We have investigated the lattice relaxation and crystalline qualities of InGaAs/GaAs heterostructure as a function of the layer thickness. The ?? heteroepitaxial layers were grown by molecular beam epitaxy(MBE).The eqilayer thickness were from 230 Å to 3 ㎛ with composition around ×=0.15. The lattice constants c obtained using double axis diffractometry(DAD) as a function of the layer thickness were constant until 1000 Å. Change in lattice constant of surface normal appeared at the thickness of1200 Å, and it decreased as layer thickness increased. The relaxation of epilayers were from 32% at 1200 Å to 84% at 3 ㎛, and the crystalline qualities of epilayers with increased with increasing thickness.

Packed-bed column에서 산림부식질의 중금속 흡착 특성

안세희,손성길,이동화,최인규 대구대학교 과학기술연구소 1999 科學技術硏究 Vol.5 No.5

This experiment investigates the adsorption characteristic of heavy metals by humic substances of Forest soil in a packed bed column. Forest humic substances contain various components such as carboxyl group, phenol group which provide active sites for heavy metal binding. Humic substances of high cation exchange capacity have been utilized for removing metal ions. The analysis of chemical structure of humic substances was investigaed by FT-IR and CP/MAS Carbon-13 NMR Spectrometer at last year. Adsorption experiments of heavy metal cation by humic substances was conducted to the optimum adsorption condition. The adsorption isotherms for Cu, Zn, Cd, Cr conformed to Langmuir's equation. In the packed bed column, the adsorption ratios of Cu, Zn, Cd, Cr on the humic substances were more than 90%. There were no significant differences between the adsorption ratio and the species of humic substances. With increasing retention time, the removal efficiency of heavy metal ions were not changed greatly. The adsorption ratio of the heavy metal ions were considerably greater for the packed bed reactor than for the stirred reactor. The stirred and column methods give similar result for the adsorption characteristics of heavy metal ion in humic substances.

소득작물 전후작지 적응 극단기성 벼 ‘중모 1032’

손영보,이종희,조준현,이지윤,오성환,송유천,박동수,박노봉,김상열,여운상,남민희,권영업 忠北大學校 農業科學硏究所 2015 農業科學硏究 Vol.31 No.2

열공형과 비열공형 피질하 혈관성 치매에서 위험인자의 차이에 관한 비교 연구

배희준,정지향,유경호,나덕렬,김상윤,최경규,양동원,손의주,이상도,김재우,박경원,김응규,이재홍,박미영,한일우,함동석,최문성,하충건,최성혜,이애영,이병철,한설희 대한치매학회 2003 Dementia and Neurocognitive Disorders Vol.2 No.2

Backgrounds and Objectives: Vascular dementia is a group of dementing disoders arising from various stroke syndrome. Among these. subcortical ischemic vascular dementia (SIVD) is regarded as a relatively distinct clinical entity. However, MRI patterns of SIVD are not homogenous. In some patients, lacunes are dominant, and in others, subcortical white matter changes are. This study was designed to compare risk factor profiles between SIVD with and without multiple lacunes. Methods: We divided 47 subjects (22 males, mean age. 68 years) recruited from VADAPET (Multicenter Trial For Evaluation Of The Changes In the PET Images Of Subcortical Vascular Dementia Patient) study into two groups one with more than 5 lacunes in deep gray matter (lacune group) and the other with 5 or less(non-lacune group) Clinical characteristics and laboratory findings of two groups were compared. Results: Nineteen of 47 patients (40%) belonged to the lacune group. The lacune and non-lacune groups d d not differ in the following variables: age, hypertension, diabetes mellitus, hyperlipidemia heart disease, history of stroke or TIA, history of trauma or major surgery, family history of hypertension stroke, or dementia, age at diagnosis of dementia, body mass index, white blood cell count, ESR, CRP, fibrinogen, hemoglobin A1C, total cholesterol. LDL cholesterol creatinine, proteinuria, glucosuria, and microhematuria. However, male sex, smoking alcohol. hemoglobin, and HDL cholesterol were possibly associated more with lacune group SIVD than with non-lacune group (p<0 1) Multivariate analyses revealed that smoking, hemoglobin, and HDL cholesterol were independent predictors of SIVD with multiple lacunes Conclusion: Our study suggests that SIVD with multiple lacunes may be significantly different in smoking habits hemoglobin, and HDL cholesterol from SIVD without multiple lacunes.

회전원통을 이용한 초고압 변압기의 유동대전에 관한 연구

곽희로,권동진,손철근 崇實大學校 生産技術硏究所 1993 論文集 Vol.23 No.-

This paper presents the measurement method using a spinning cylinder system for streaming electrification of transformer oil. The spinning cylinder system has a simple mechanical construction, and requires less oil compared to the other methods. Also, the effects of various admixtures on the static electrification properties of transformer oil can be easily investigated. Experiments showed that addition of the BTA reduced the streaming electrification and the polarity of static electrification was converted to negative at 50∼70[ppm] of BTA.