진단 기준에 따른 취학전 어린이의 중증 유아기 우식증 유병률 비교

임경욱,이광희,라지영,이동진,안소연,김지영,송지현,김윤희 大韓小兒齒科學會 2008 大韓小兒齒科學會誌 Vol.35 No.4

연구목적은 중증 유아기 우식증에 대한 두 개의 정의를 진단 기준으로 하였을 때 각 기준에 따른 유병률이 일치하는 정도를알기 위함이었다. 연구대상은 익산시 어린이집 중에서 무작위로 추출한 7개 어린이집의 36개월 이상 71개월 이하 어린이401명 이었다. 치경과 탐침을 사용한 구강검사를 통하여 치아별 우식경험유치면 (dmfs)의 수를 조사하였으며 . 중증 유아기 우식증의 진단 기준은 (1) 상악 전치에 1개 이상의, 와동이 형성된 우식,상실(우식증에 의한), 충전 평활면이 있거나 (2) 우식,상실,충전 치면의 수가 3세는 4개 이상.4세는 5개 이상.5세는 6개 이상인 경우로 하였다. 상악 전치부 우식증에 의한 우식유병률과 우식경험유치면수(dmfs)에 의한 우식유병률은 3세에서 각각 26.7%. 28.9%, 4세에서 각각 32.4%, 30.4%, 5세에서 각각 39.4%, 41.3%, 전체에서 각각 35.4%, 35.9%으로서. 연령별로는 약간의 차이가 있었으나 전체에서는 차이가0.5%로서 거의 일치하였다. 따라서 중증 유아기 우식증의 진단은 두 가지 기준 중에서 어느 하나를 사용하더라도 비슷한 결과가 나을 것이라는 것을 확인할 수 있었다. The purpose of study was to compare the prevalences of severe early childhood cahes(S-ECC) using two different diagnostic criteria. The subjects of this study included 401 preschool children from 36 to 71 months of the randomly selected seven nurseries in Iksan city. Severe early childhood caries was defined as (1) 1 or more cavitated, missing (due to caries), or filled smooth surfaces in primary maxillary anterior teeth or (2) a decayed, missing, or filled score of ≥4 (age 3), ≥5 (age 4), or ≥6 (age 5) surfaces. The prevalence determined by maxillary anterior caries and the prevalence determined by dmfs were 26.7%, 28.9% in 3 years, 32.4%, 30.4% in 4years. 39.4%, 41.3% in 5 years, and 35.4%, 35.9% in all, respectively. The results suggest that the two diag-nostic criteria of the severe early childhood caries yield almost the same results.

BPF를 이용한 시변 확률 시스템의 제어기 설계

임윤식,이명규,안두수 成均館大學校 科學技術硏究所 1997 論文集 Vol.48 No.1

The orthogonal function has been widely employed to solve the control problems, whereas its application to solve the LQG prroblem has hardely been used. Chang & Lee suggested direct application of orthogonal function to Riccatti equation and covariance matrix Riccatti equation. But in this method, the dimension of the integration operational matrix enlarge as the order of the system or the number of expansion term increases. In this paper, in order to solving Riccatti equation and covariance matrix Riccatti equation, TPBVP and matrix fraction method are used. LQG controller is designed by applying block pulse function to this method.

DBS 수신을 위한 Dual Phase LNB 설계

임윤두,고봉진 한국항행학회 2002 韓國航行學會論文誌 Vol.6 No.3

DBS (Direct Broadcasting Satellite)는 광범위한 주사영역과 고품질의 서비스를 제공하므로 정보화 사회에서 매우 유용한 매체로 활용되고 있으며, 이동체 에서도 위성 방송을 수신할 수 있는 기술을 필요로 한다. 본 논문에서는 한반도 연근해를 항해구역으로 하는 선박과 육상 이동체 에서 윤 수신이 가능한 trracking antenna용 Dual LNB를 설계하였다. 설계한 Dual phase LNB는 저잡음 증폭기, 대역통과 필터, 발진기, 혼합기, 중간주파 증폭기로 구성하였고. 위치 추적을 위해 각각 두 입·출력 위상을 동위상으로 구현하였다. 측정 결과, 117GHz~12.2GHz의 입력신호에 대하여 잡음지수는 0.87 dBmax, 변환이득 62dB이고, 온도특성은 -30℃~60℃에서 400kHz이고, 위상잡음은 100kHz 옵셋에서 -101 dBc/Hz로서 우수한 성능을 나타내었다. DBS is utilized as very useful media in information-oriented society because it covers wide service area and provide high quality services. But DBS needs skill that can receive DBS signal at move. In this paper, it is considered a development of a device to receive DBS and design of a low noise downcoverter that use tracking antenna to receive DBS at mobiles unit and ships which navigate in Korea peninsula coast. The structure of dual phase LNB is composed of LNA, BPF, oscillator, mixer, and IF amplifier. And for the position tracking, two input-output phase performed inphase. Measured results showed good performance that with respect to input signal 11.7 GHz ~ 12.2 GHz. noise figure is 0.87 dBmax and conversion gain 62 dB, temperature characterization ±400 kHz in respect to -30 to 60℃, and phase noise -101 dBc/Hz in respect to offset 100 kHz.

건축물 고형시료 중 석면 분석을 위한 방해 물질 제거방법에 대한 연구

김윤재,임지현,장봉기 순천향대학교 기초과학연구소 2021 순천향자연과학연구 논문집 Vol.27 No.1.2

In this study the following pretreatment methods are proposed using solid samples of buildings : furnace ashing methods according to the existing waste process, acid treatment after furnace ashing, acid treatment using graphite block acid circulation, a new method of attempting. This study propose a method for pretreatment of solid samples in buildings containing asbestos with a comparison of the asbestos analysis obstruction removal rates according to the above mentioned methods. The materials used in this study are 48 slates of 3 types and 48 textures of 3 types, total 96 samples which are solid samples in buildings. Pretreatment and acid treatment methods were classified in four ways: Electric high temperature furnace ashing methods according to the existing waste process and acid treatment with HCl(1+3)(Group A), Electric high temperature furnace ashing methods and acid treatment with aqua regia(HCl 3 : HNO3 1)(Group B), acid treatment with aqua regia(Group C) using graphite block acid circulation, a new method of attempting and acid treatment with inverse aqua regia(Group D). The removal rate of furnace ashing from slate samples in A and B treatment groups was 13.91%, and the removal rate of furnace ashing from texture samples in A and B treatment groups was 9.21%, so the removal rate of furnace ashing from slate samples was significantly higher than texture samples(p<0.001). The removal rate of asbestos analysis interfering substances from slate samples and texture samples in C treatment group with acid treatment with aqua regia using graphite block acid circulation were 30.50% and 30.58%, respectively. So in both slates and texture samples, the removal rate of asbestos analysis interfering substances from the slates and texture samples of A, B, and D treatment groups was significantly higher(p<0.001). The newly proposed acid treatment with aqua regia using graphite block acid circulation method in this study significantly eliminated more acid solubility material and asbestos analysis interfering substances than electric high temperature furnace ashing methods according to the existing waste process and acid treatment with HCl(1+3), and this method does not go through the process with high temperature furnace ashing, it is believed that asbestos analysis can be made easier by preventing changes in the characteristics of asbestos and the use of graphite block acid collection devices when acid treatment of solid samples in buildings containing large amounts of asbestos analysis interfering substances can be more effective than conventional methods.

Gullian Barre Syndrome 患者 1例에 대한 症例報告

임승민,안정조,최영,조현경,김민상,유병찬,오병렬,김윤식,설인찬 대전대학교 한방병원 2002 惠和醫學 Vol.11 No.1

Gullian Barre Syndrome is an acute symmetric polyradiculoneuropathy that typically presents as a progressive flaccid paralysis. The pathology is believed to be caused by both cellular and humoral immune processes The possibility of death is 3-5% and About 20% of patients require mechanical ventilaton. Recently We have experienced a patient who had suspected Gullian Barre Syndrome for 60days, his condition weakness and pain was impoved through the herb and acupucture Therefore I reported it for the treatment.

미세형상가공시 센서융합을 이용한 공구 마멸 및 파손 메커니즘 검출

임정숙,왕덕현,김원일,이윤경 한국공작기계학회 2002 한국공작기계학회 춘계학술대회논문집 Vol.2002 No.-

A successful on-line monitoring system for conventional machining operations has the potential to reduce cost, guarantee consistency of product quality, improve productivity and provide a safer environment for the operator. In fine-shape machining, typical signs of tool problems such as vibration, noise, chip flow characteristics and visual signs are almost unnoticeable without the use of special equipment. These characteristics increase the importance of automatic monitoring in fine-shape machining; however, sensing and interpretation of signals are more complex. In addition, the shafts of the micro-tools break before the typical extensive cutting edge of the tool gets damaged. In this study, the existence of a relationship between the characteristics of the cutting force and tool usage was investigated, and tool breakage detection algorithm was developed and the following results are obtained. In data analysis, didn't use a relative error compare which mainly used in established experiment and investigated tool breakage detection algorithm in time domain which can detect AE and cutting force signals more effective and accurate.

블럭펄스 함수를 이용한 비선형 확률 시스템의 제어기 설계

임윤식,정제욱,안두수 成均館大學校 科學技術硏究所 1997 論文集 Vol.48 No.2

The purpose of this paper is to indicate how the available thoery of optimal control and estimation for the so called linear-quadratic-Gaussian(LQG) problem provides such a unified design procedure for the nonlinear system. In particular, we wish to stress the advantages of this method from the viewpoint of ease of computation, since the theory provides us with equation that can be readily solved by modern digital computers. This algorithm minimizes the effect for the initial error by adaptive analysis method via BPF and the each sampling interval of the nonlinear system is linearized using BPF's coefficients, the convergence of the estimated states can be improved.

Hydroxy Propyl Methyl Cellulose 분진의 습도와 온도에 대한 영향성 연구

임우섭,목연수,최재욱 한국안전학회 2004 한국안전학회지 Vol.19 No.3

This study was performed with Hartmann type dust explosion apparatus and Godbert-Greenwald furnace apparatus in order to research the effect of temperature and humidity affecting LEL, minimum ignition temperature of Hydroxy Propyl Methyl Cellulose. The experimental determinations in the range between 20℃ and 60℃ of temperature was not affected LEL(180g/m³) but LEL showed 200g/m³ and 250g/m³ at 80℃ and 100℃. As the change of humidity LEL was 180g/m³ for 50%, 200g/m³ for 60% and 250g/m³ for 70% but dust explosion didn't occur over 80%, The ignition temperature of HPMC dust clouds was increased as increasing of humidity. So, the minimum ignition temperatures at 50%, 60%, 70%, 80% of humidity was 363℃, 375℃, 397℃, 405℃.

블럭펄스 함수를 이용한 확률동적 시스템의 상태추정

임윤식,안비오,안두수 成均館大學校 科學技術硏究所 1996 論文集 Vol.47 No.1

This paper presents a method to design Kalman filter on continuous stochastic dynamical systems via BPF(block pulse functions). When we design Kalman filter , minimum error variance matrix is appeared as a form of nonlinear matrix differential equations. Such equations are very difficult to obtain the solutions. Therefore, in this paper, we simply obtain the solutions of nonlinear matrix differential equations from recursive algebraic equations using BPF. We believe that the presented method is very attractive and proper to the states estimation on continuous stochastic dynamical systems

배관의 캐비테이션 침식-부식 특성에 관한 연구

임우조,황재호,김윤곤 釜山水産大學校 1994 釜山水産大學 硏究報告 Vol.34 No.1

In this study, the steel pipe piping water(SSPW) and SPPW on weldment were tested by using of a cavitation erosion - corrosion test appartus with nozzle(water tunnel type) and were investigated under the marine environment of liquid. The main results obtained were as follows 1) The corrosion - erosion of weldment is more susceptible than that of base metal. 2) The weight loss rate of heat affected zone of weldment can be largely improved by the preheat, dry of base metal and electrode before welding. 3) The electrode potential becomes noble by the pre-heat, dry of base metal and electrode before welding, and the corrosion current density is decreased.