[논문]플라이 애쉬의 알칼리-실리카 반응에 대한 팽창 억제효과

김정은,전쌍순,서기영,진치섭 釜山大學校生産技術硏究所 2004 生産技術硏究所論文集 Vol.63 No.-

본 연구의 목적은 플라이 애쉬가 알칼리-실리카 반응에 미치는 영향을 알아보는 데 있다. 이를 위해서 시벤트를 플라이 애쉬로 치환한 모르타르 바를 제작하였다. 플라이 애쉬 치환률은 시멘트 줌량비에 대해 0, 5, 10,15, 25 및 35% 를 치환하였고 골재는 반응성 골재인 변성암과 퇴적암을 사용하였다. 플라이 애쉬로 치환한 모르타르 바의 알칼리-실리카 반응은 ASTM C 1260 시험법으로 조사하였다. ASTM C 1260 시험법은 16일이라는 짧은 기간동안 알칼리-실리카 반응을 알아 볼 수 있는 장점이 있다. 시험 결과I 알칼리-실리카 반응에 의한 모르타르 바의 팽창은 플라이 애쉬 치환율이 증가함에 따라서 감소하였고 플라이 애쉬의 치환율이 클수록 초기 강도가 낮아지고 유동성이 저하되는 것으로 나타났다. 플라이 애쉬 치환율은 알칼리-실리카 반응 억제효과와 강도 및 유동성 측면을 모두 고려할 때 25% 가 가장 적절한 것으로 판단된다.

Pd(Ⅱ)이온과 Linear Poly(ethyleneimine)간에 생성되는 고분자-금속 착물의 구조와 성질에 관한 연구

한정호, 전은덕, 조태섭 영남대학교 기초과학연구소 2000 基礎科學硏究 Vol.20 No.-

Pd(II) metal ion has attracted interest of many researchers because of its potential applications and of its similarity and difference in chemical properties. In this study, complex formation of Pd(II) metal ion with polymeric amine ligand namely, linear poly(ethyleneimine)(LPEI), was investigated utilizing spectroscopic and potentiometric methods as well as elementary analysis. From UV/VIS spectroscopic study, complexation of LEPI to Pd(II) ion exhibit an absorption band at 347nm at the low mole ratio (below 2.0). This species can be understood either as the binuclear complex bridged by chloride ions or a complex of Pd(II) ion with three chloride ions and an amine group. At the high mixing ratio, absorption spectrum centered at 300nm was apparent, which is due to the complexation of LPEI to the Pd(II) ion. Mole ratio analysis for the LPEI-Pd(II) system revealed that complex formation was most stable at the LPEI ratio of 4.0 relative to metal ion. This result was confirmed by elementary analysis. From the potentiometric titration, successive and overall stability constants were measured and the results were analyzed by a modified Bjerrum method.

애엽, 지각, 아교주 및 목향의 투여가 임신중 생쥐의 생식능력에 미치는 효과

정형민,차수경,임정묵,신태은,박찬,장준복,이경섭,송병기 경희대학교 2000 慶熙醫學 Vol.16 No.2

Cu(Ⅱ)이온과 Poly(vinyl alcohol)간에 생성되는 고분자-금속 착물의 열역학적 거동에 관한 연구

전은덕, 한정호, 조태섭 영남대학교 기초과학연구소 2000 基礎科學硏究 Vol.20 No.-

The dissociation constants for poly(vinyl alcohol) (PVA) at a constant ionic strength of μ=0.1(KCl) were measured by potentiometric titration at various temperatures. The formation constants for the Cu(II)-PVA complex at the same condition were also measured in this study. From the temperature dependence of those dissociation and formation constants, various thermodynamic parameters such as ΔG, ΔH, ΔS were determined. From the thermodynamic parameters, it was concluded that the dissociation of a proton from PVA is unfavorable with a negative entropy and positive enthalpy. In contrast, the complex formation was a spontaneous and exothermic process with favorable entropy.

신경망을 이용한 동적 제조공정의 탐지 및 인식

허정준,김광섭,구자항 대한설비관리학회 1997 대한설비관리학회지 Vol.2 No.2

This research is focused on developing a methodology for detecting the time of model change in the pocess and on designing a procedure for identifying the change based on neuro-modeling. The proposed detection procedure uses a fixed series of one-step prediction errors, which are obtained from a pre-determined neural network model. The model identification procedure is based on neuro-modeling. Kohonen's Self-Organizing Map (SOM) neural network and Radial Basis Function (RBF) neural network are used for modeling of a dynamic manufacturing process which is considered as a quasi-stationary time series. The proposed SOM and RBF neural networks attempt to decompose a picewise stationary series into a set of stationary segments and predict each sub-series thereby. Three different approaches are compared for model identification: the first approach is based on the feedforward network with the back-propagation error rule; the second one is based on the Bayesian discriminant function for minimizing the average probability of error; and the third one is based on the minimum distance measure for mininuzing the Euclidean distance between the input feature vector and feature vectors of the each sub-models. The proposed approaches are verified throught simulations. The performance of the proposed approaches are efficient and the suggested methods can readily employed for real manufacturing applications.

신호분리를 위한 Diplexer에 관한 연구

성정현,김성균,김상혁,김호섭,박준석,안달 호서대학교 반도체제조장비국산화연구센터 2000 학술대회 자료집 Vol.2000 No.1

본 논문에서는 신호의 분리와 합성이 가능한 Diplexer를 제작하였다. 저역 통과 여파기와 고역 통과 여파기의 특성을 정합하여 Diplexer로 구현함으로써 신호의 분리와 합성이 가능하다는 것을 시뮬레이션을 통해 확인하였다. 또한 신호의 분리와 합성의 가능성을 입증하기 위해 실제 마이크로스트립구조의 Diplexer를 제작, 측정한 결과 각각의 통과 대역폭 내에서 0.4dB, 0.8dB이내의 삽입손실과 -20dB의 반사손실이 됨을 실험결과를 통해 알수 있었고 또한, 인덕터의 구현 방법을 마이크로스트립으로 하여 주파수 특성과 재현성을 높였다.

계층화된 퍼지 인지도를 이용한 신뢰기반 경매시스템

김현준,류정섭,권효석,조형래 경상대학교 생산기술연구소 2003 工學硏究院論文集 Vol.19 No.-

This paper introduces trust measurement that is composed of trust variables and fuzzy cognitive map. The improved trust measuring method using a stratified FCM can be used to measure the level of risk involved in a specific auction transaction concerned. To reduce the auction transaction cost and time, the proposed system recommends a differentiated transaction protocol according to the risk based on trust measurement. In this system, trust measurement can also be applied for differentiated and varied auction services.

세로토닌성 항우울제가 백서의 Schedule-Induced Polydipsia에 미치는 영향

이기철,이정호,박중섭,최영민,전성일,정홍경,하준명,정재현 대한생물치료정신의학회 1999 생물치료정신의학 Vol.5 No.2

Object : Schedule-induced polydipsia is considered as an animal model of obsessive-compulsive disorder inrats. The authors evaluated the chronic effects of fluoxetine and clomipramine as serotonergic antidepressants and haloperidol as dopaminergic antagonist on the schedule-induced polydipsia in rat.Methods : Spraque-Dawley rats weighing 200-250gm were individually housed, maintained and allowed free access to water for 1 week. And then the rats were placed on a restricted diet. To induce polydipsia, rats were placed in automatic cage where a pellet dispenser automatically dispensed 90mg pellets on a fixed-time 60 seconds(FT 60s) feeding schedule over 150-minute test session for a day. Water was available at all times during the feeding schedule in automatic cage. After 4 weeks of daily exposure to the FT 60s feeding schedule, experimental rats met a predetermined criterion for polydipsic behavior(greater than 3 times of water per session on average). 4 groups of rats were administered fluoxetine(5mg/kg/i.p.), clomipramine(5mg/kg/i.p.), haloperidol(0.1mg/kg/i.p.), vehicle(1cc/kg/i.p.) for 3 weeks. Rats were tested once a week to access schedule induced polydipsic behavior. The chronic effects of experimental drugs on schedule induced polydipsic behavior were analyzed with repeated analysis of variance and Scheffe test as a post-hoc comparison.In order to measure water consumption in non-polydipsic food-deprived rats, a separate group of rats(N=8) were individually housed and given a single bolus(14.5 gm) of food per day which maintained them at their average body weight.Results and Conclusion : The results were as follows ;1) After 4 weeks of daily feeding procedure with fixed time schedule for 60 seconds per day, the experimental group showed significant differences than the control in the amount of water consumption as compared with their baseline water intakes. At the same periods, there were no differences between the experimental group and the control in body weight. 2) The clomipramine treated group and the fluoxetine treated group showed significant decrease in the amount of water intake as compared with their baseline of polydipsic water intakes for 3 weeks of treatment. However, the haloperidol treated group and the vehicle control group showed no changes of amounts of water intake for 3 weeks of treatment as compared with their baseline of polydipsic water intakes. 3) At 2 weeks of drug treatment, clmipramine treated group(16.88±6.51ml) and the fluoxetine treated group(22.50±10.35ml) showed significantly lower amounts of water intake than the haloperidol treated group (41.25±7.06ml) or vehicle control group(37.50±12.54ml). And also the clomipramine treated group(13.75±5.18ml) and the fluoxetine treated group(18.75±3.54ml) showed significantly lower amounts of water intake than the haloperidol group(35.00±11.65ml) and the vehicle control(34.38±6.78ml) at 3 weeks of drug treatment. Above findings suggest that the fixed time feeding procedure for schedule-induced polydipsia as an animal model of obsessive compulsive disorder was effective to the evaluation of pharmacological challenge study. The author confirmed that schedule-induced polydipsia was successfully decreased for 3 weeks of administration of clomipramine and fluoxetine but there was no response to haloperidol.

관절각과 지면반발력을 이용한 보행 단계의 분류

채민기(Min-Gi Chae),정준영(Jun-Young Jung),박철제(Chul-Je Park),장인훈(In-Hun Jang),박현섭(Hyun Sub Park) 제어로봇시스템학회 2012 제어·로봇·시스템학회 논문지 Vol.18 No.7

This paper proposes the gait phase classifier using backpropagation neural networks method which uses the angle of lower body’s joints and ground reaction force as input signals. The classification of a gait phase is useful to understand the gait characteristics of pathologic gait and to control the gait rehabilitation systems. The classifier categorizes a gait cycle as 7 phases which are commonly used to classify the sub-phases of the gait in the literature. We verify the efficiency of the proposed method through experiments.

흡연에 의한 급성 호산구성 폐렴 2예

박종빈,김학렬,주현준,유태양,신성남,신정현,송정섭,황기은,김소영,양세훈,정은택 圓光大學校 醫科學硏究所 2008 圓光醫科學 Vol.23 No.2

최근 흡연을 시작한 젊은 성언에서 급성 호산구성 폐렴의 발생에 대한 증례가 보고되고 있다. 급성 호산구성 폐렴은 대개 발열을 동반하기 때문에 초기에는 감염성 폐렴으로 잘못 진단, 치료되는 경우가 많다. 아직 정확한 병태 생리 및 조직학적 소견은 밝혀져 있지 않지만 병력 청취 및 임상 양상, 방사선 소견의 관찰을 통해 급성 호산구성 폐렴을 의심하고, 진단을 위해 기관지 폐포 세척액 검사를 시행한다면 좀 더 쉽게 진단 내릴 수 있을 것이다. 본 저자들은 최근 처음 시작한 흡연에 의해 발생한 급성 호산구성 폐렴을 진단하고, 스테로이드를 투여하여 성공적으로 치료한 환자 2예를 경험하였기에 이를 문헌 고찰과 함께 보고하는 바이다. Acute eosinophilic pneumonia(AEP) is characterized by acute febrile respiratory illness associated with diffuse pulmonary infiltration and pulmonary eosinophilia. The specific etiology for acute eosinophilic pneumonia is elusive. By some investigators, cigarette smoking is suggested as a causative substance which can cause AEP. In recent, the authors experienced two cases of AEP following cigarette smoking. Both cases had characteristic features including age around 20 years, new onset smoking before occurance of AEP, diffuse infiltration on chest radiography, pulmonary eosinophilia based on bronchoalveolar lavage and acute improvement after steroid therapy. These clinical features are resemble with previous smoking induced AEP case reports. Base on these clinical features, cigarette smoking associated AEP could be diagnosed more easily.