• KSBB Journal
• /
• v.10 no.1
• /
• pp.105-112
• /
• 1995

The fiber-optic biosensor using enzyme-immobilized Langmuir-Blodgett film is developed fort the measurement of ethanol. The enzyme, alcohol dehydrogenase, is immobilized at the molecular level on the arachidic acid monolayer using Langmuir-Blodgett film technique. Based on the ordered multisubstrate mechanism, the immobilized enzyme kinetics is investigated. The optical sensing system is proposed, and sensor signal is proportional to ethanol concentration and is related wish the number of enzyme layers. As the number of deposited LB film layer increases up to 20 1ayers, the high ethanol concentration of 45mM can be measured without the saturation of signal. Surface pressure-area isotherm is measured for the three-different charged-lipids. Arachidic acid is the most suitable for the adsorption of alcohol dehydrogenase based on electrostatic force.

• Journal of Sensor Science and Technology
• /
• v.3 no.2
• /
• pp.33-39
• /
• 1994

A quartz crystal microbalance (QCM) sensor system for the detection of odorants, especially environmental pollutant, has been constructed by depositing various phospholipids, activated carbon and lead compound pigment onto the surface of the QCM. The characteristics of a QCM operating at 9 MHz deposited with phosphatidyl- choline were analysed. An explanation is given for different odorant affinities based on the monolayer properties of phospholipids. The identification of odorants is discussed in terms of a comparison of their normalized resonant frequency shift patterns and relative response intensities calculated from the response areas. Applying the lead compound pigment coated QCM, it was possible to detect sulfur compound specifically. Using a number of different lipid-coated QCMs, odorants could be identified by comparing the response patterns.

• Journal of fish pathology
• /
• v.32 no.1
• /
• pp.29-35
• /
• 2019

A monitoring was performed to survey the mortalities that had occurred in the aquaculture farms of olive flounder (Paralichthys olivaceus) in South Korea from 2015 to 2017. The indirect inquiry for entire farms and the sample survey for selected farms were carried out. The aquatic organism disease inspectors, who have a national license for the diagnosis and prevention of aquatic organism diseases and a have close relationship with the farms, investigated the rates and causes of mortalities according to the standard manual. The mortality rate by sample survey of farms in 2015, 2016, and 2017 were 24.78% (Chunnam: 17.86%, Jeju: 28.69), 30.19% (Chunnam: 24.45%, Jeju: 32.65), and 21.59% (Chunnam: 10.57%, Jeju: 26.00%), respectively. The major cause of mortality was scuticociliatosis, and the mortality caused by viral hemorrhagic septicemia and emaciation disease (Jeju) were also high. Our results can contribute to effective establishment prevention of epidemics system and acquired status as a disease-cleansing country.

• Proceedings of the ESK Conference
• /
• 1993.10a
• /
• pp.20-20
• /
• 1993

반복적인 일의 수행으로 인한 병인 누적외상병에 관해 살펴보고자 한다. 누적외 상병(Cumulative Trauma Disorders)이란 비교적 생소한 질환으로 손이나 어떤 신체 부위를 반복적으로 오래 사용하였을 때 오는 병이다. 이 질환은 200년전 이탈리아 의사인 Benardino Ramazinni에 의해 분류되었으나 최근까지 큰 관심을 끌지 못했 다. 이 병은 Tennis Elbow(테니스 팔꿈치) 또는 Triger Finger(방아쇠 손가락)등 으로 더 잘 알려져 왔다. 그리고 의학계에서는 Ganglions(수종)으로 알려져 왔다. 그러나 80년대의 탁상컴퓨터의 보급으로 많은 사무실에서 반복적인 작업을 연속적 으로 하게 되어 많은 사무원들이 누적외상병(CTD)으로 고통에 시달리게 되고, 심한 경우에는 수술까지 하게된다. 제안자 역시 이 병으로 손목수술을 받은 바 있는 데 이 병은 잠복기가 몇년씩 되는 직업병이다. 이병의 특성상 암과 같이 조기에 발견 하기 어렵고, 이것을 느꼈을 때는 대부분 너무 늦어 수술이 불가피한 경우가 많다. 본 연구에서는 누적외상병의 실체와 현재까지의 외국에서 수행된 연구결과를 소개하고, 현재 한국에서의 이병의 실태를 파악하기 위해 표본대상을 선정하여 설 문조사와 실측조사를 함께 수행하고자 한다. 표본대상으로 육체노동으로 반복작업 을 하는 (Blue-Color) 집단, 사무실에서 반복작업을 하는 (White-Color) 집단, 그리 고 가정에서 반복작업을 하게 되는 주부집단등으로 나누어 실태조사를 하고자 한다. 설문조사의 통계처리를 바탕으로 한국에서의 누적외상병에 관한 실태조사와 의식구 조까지를 진단해 보고자 한다. 그런 다음 총체적이고 최신의 이론과 연구에 바탕을 둔 해결책과 대안을 제시해 보고자 한다.콘에 대해 일반화시키기는 어려우나 이후에 행해질 Icon-based User Interface 분야의 많은 연구들의 기초가 될 것이다. 더불어 아이콘과 관련된 많은 요인들(문화적 영향, 아이콘 색깔, 크기, 아이콘의 위치등이 인식에 미치는 영향)에 대해서도 연구가 행해져야 할 것이다. 확인하고 각각의 기능을 분명히 했다.가 수월하게 하였고 메모리를 동적으로 관리할 수 있게 하였다. 또한 기존의 smpl에 디버깅용 함수 및 설비(facility) 제어용 함수를 추가하여 시뮬레이션 프로그램 작성을 용이하게 하였다. 예를 들면 who_server(), who_queue(), pop_Q(), push_Q(), pop_server(), push_server(), we(), wf(), printfct() 같은 함수들이다. 또한 동시에 발생되는 사건들의 순서를 조종하기 위해, 동시에 발생할 수 있는 각각의 사건에 우선순위를 두어 이 우선 순위에 의하여 사건 리스트(event list)에서 자동적으로 사건들의 순서가 결정되도록 확장하였으며, 설비 제어방식에 있어서도 FIFO, LIFO, 우선 순위 방식등을 선택할 수 있도록 확장하였다. SIMPLE는 자료구조 및 프로그램이 공개되어 있으므로 프로그래머가 원하는 기능을 쉽게 추가할 수 있는 장점도 있다. 아울러 SMPLE에서 새로이 추가된 자료구조와 함수 및 설비제어 방식등을 활용하여 실제 중형급 시스템에 대한 시뮬레이션 구현과 시스템 분석의 예를 보인다._3$", chain segment, with the activation energy of carriers from the shallow trap with 0.4[eV], in he amorphous regions.의 증발산율은 우기의 기상자료를 이용하

• Journal of the Korean Geotechnical Society
• /
• v.24 no.5
• /
• pp.129-137
• /
• 2008

An active application of concrete track is being expected far the future constructions of Korean railroad. In comparison with the existing ballasted tract, a concrete track is very susceptible for the settlement, since its rehabilitation requires much time and cost. When a concrete track is constructed on fine-grained subgrade soil, excessive cumulative plastic settlements due to repetitive train road may occur. In this case, the settlement of the concrete track may be effectively reduced by installing a small number of small-diameter piles beneath the track. This paper presents the effect of pile installation on the reduction of cumulative plastic settlement of concrete track. A method combining experiential equation and numerical method is proposed. Using an existing experiential equation and the estimated earth pressure distribution, the cumulative plastic strain was calculated. From the results, it is verified that the effects of the pile installation is significant to effectively reduce the cumulative plastic settlement of concrete track. The reduction effects of the cumulative plastic settlement according to the pile number and pile arrangement are presented.

• The Journal of Korean Academy of Prosthodontics
• /
• v.50 no.1
• /
• pp.61-66
• /
• 2012

Purpose: This study was to compare the cumulative survival rate (CSR) of Br${\aa}$nemark machined surface implants and TiUnite$^{TM}$ imlants and to analyze association between risk factors and the CSR of the implants. Materials and methods: A retrospective study design was used to collect long-term follow-up clinical data from dental records of 156 patients treated with 541 Br${\aa}$nemark machined and TiUnite$^{TM}$ implants at Korea University Guro hospital in South Korea from 1993 through 2008. Machined implant and TiUnite$^{TM}$ implant were compared by CSR. Exposure variables such as gender, systemic disease, location, implant length, diameter, prosthesis type, opposing occlusion type, date of implant placement, type of edentulous space, abutment type, existence of splinting with natural teeth, and existence of cantilever were collected. Life table analysis was undertaken to examine the CSR. Cox regression method was conducted to assess the association between potential risk factors and overall CSR (${\alpha}$=.05). Results: Patient ages ranged from 16 to 75 years old (mean age, 51 years old). Implants were more frequently placed in men than women (94 men versus 63 women). Since 1993, 264 Br${\aa}$nemark machined implants were inserted in 79 patients and since 2001, 277 TiUnite$^{TM}$ implants were inserted in 77 patients. A total survival rate of 86.07% was observed in Br${\aa}$nemark and Nobel Biocare TiUnite$^{TM}$ during 15 years. A survival rate of machined implant during 15 years was 82.89% and that of TiUnite$^{TM}$ implant during 5 years was 98.74%. The implant CSR revealed lower rates association with several risk factors such as, systemic disease, other accompanied surgery, implant location, and Kennedy classification. Conclusion: Clinical performance of Br${\aa}$nemark machined and TiUnite$^{TM}$ implant demonstrated a high level of predictability. In this study, TiUnite$^{TM}$ implant was more successful than machined implant. The implant CSR was associated with several risk factors.

• Proceedings of the Acoustical Society of Korea Conference
• /
• autumn
• /
• pp.523-526
• /
• 2004

미숙련 작업자들에 의하여 생산되는 라우드스피커의 특성들을 분석하여 제작된 제품들의 품질 신뢰도를 분석하였다. 동일한 부품을 사용한 경우임에도 조립 제작과정에서 누적된 미확인 제작오차에 의하여 발생하는 스피커의 전기 임피던스와 음향응답특성등의 산포도를 분석하였다. 또한, 전기 임피던스 곡선들로부터 T-S 매개변수 규명법으로 규명한 스피커 매개변수들의 산포도도 분석하였다. 부품들의 질량에 대한 실측치와 매개변수법으로 규명한 결과를 비교하여 조립제작과정에서 이 값들의 변화 되는 정도도 분석하였다.

• Journal of the Korean GEO-environmental Society
• /
• v.22 no.10
• /
• pp.31-36
• /
• 2021

Estimation of accumulated rotational angles and settlements are critical in design of wind turbine foundation. However, there have been few exploring the response of bucket foundation to long-term cyclic loading. We performed a series of three-dimensional finite element analyses of bucket foundations installed in sands. An empirical formulation which captures the stiffness degradation observed in cyclic triaxial tests implemented into the finite element analysis in the form of a user subroutine. Using the stiffness degradation model the accumulated rotation and displacement of bucket foundation were calculated. Additionally, important factors affecting the response under cyclic loading were assessed.

• Journal of the Korean BIBLIA Society for library and Information Science
• /
• v.34 no.4
• /
• pp.77-99
• /
• 2023

This study aims to quantitatively assess collection and circulation data of one small library in an area where multicultural users are concentrated and draw policy implications on improving multicultural services for public libraries. The Ansan Multicultural Small Library was selected for examining the library's collection and circulation usages from 2016 to 2022. The numbers of collection and circulation, collection turnover rates and use factors were calculated by year, language, and KDC subject. The result of this study presents the empirical evidence drawn from users' circulation usage, which can be a basis for leading to valid collection development and multicultural service policies.

• Proceedings of the KIEE Conference
• /
• 2007.07a
• /
• pp.1474-1475
• /
• 2007

해안거리에 따른 등가염분부착밀도(Equivalent Salt Deposit Density)의 수동오손측정은 동해, 서해, 남해의 해안가 및 제주도, 진도, 거제도의 도서지역에 설치되어 있는 112개소에서 매월 1개월 누적오손을 측정하였다. 이와 같이 수동으로 측정된 ESDD는 전력연구원에서 수행한 "전력설비의 염진해 대책에 관한연구(1988)" 및 "염진해 오손정도 및 기준정립에 관한 연구(2002)"에서 분석기법으로 활용한 통계분석기법을 사용하여 분석하였다.