Tabu 탐색법을 이용한 PI 제어기 설계

원태현,황기현,문경준,이용길 동의공업대학 2000 論文集 Vol.26 No.1

We propose an adaptive Tabu search method changing neighbor solution's range to be searched each iteration according to an objective function and design a PI controller using the proposed Tabu search. We apply it to a time-delay system to evaluate the usefulness of the proposed method. overshoot, rising time, and settling time.

p-Anisaldehyde가 조골세포 분화에 미치는 영향

김경민 ․ 이도원 ․ 김현준 ․ 김아랑 ․ 장원구 대구대학교 산업기술연구소 2018 産業技術硏究 Vol.29 No.2

p-Anisaldehyde is a natural fragrance extracted from Pimpinella anisum L., and used as a preservative. This study examined the effect of p-anisaldehyde on osteoblast differentiation. First, cytotoxicity tests were carried out after examining the concentrations that did not show toxicity to the cells. The expression of osteoblast differentiation marker gene was confirmed by RT-PCR and was not effective in the treatment with p-anisaldehyde alone. However, p-anisaldehyde decreased the expression levels of inhibitor of differentiation-1 (Id1), distalless related homeobox (Dlx5), and runt-related transcription factor 2 (Runx2), which are osteogenic differentiation marker genes, which are increased in osteogenic condition. alkaline phosphatase (ALP) activity was also confirmed by ALP staining that p-anisaldehyde reduced ALP activity. These results show that p-anisaldehyde is effective in reducing osteoblast differentiation.

전자기식 센서의 용접선 검출 특성에 관한 연구

김원일,이윤경,우성문,최상봉 경남대학교 신소재연구소 1997 論文集 Vol.8 No.-

본 논문은 전자기식 센서의 용접선 검출 특성에 관한 연구이다. 센서의 검출 성능에 영향을 미치는 설계 인자를 실험을 통하여 결정하고 센서를 제작하였다. 제작된 와전류식 전자기 센서를 용접선에 가로지르는 방향으로 주사하여 센서의 용접선 검출능력을 확인하였다. 그리고, 냉간 압연강판 및 스테인레스 스틸, 알루미늄, 구리와 같은 다양한 재료에 대해 용접선 검출 능력을 확인한 결과 냉간 압연강판에서의 검출 능력은 가장 양호하게 나타났고 고합금강 및 비철금속에 대해서도 용접선 검출 가능성을 확인하였다. 또한, 높이 방향 제어용 센서로써의 가능성도 확인하였다. This study is a work on weld line detecting characteristriic of electromagnetic sensor arc welding. Design parameters which effect on sensor performance were determined by experiments. Then a proper electromagenetic sensor of eddy current type was made by using the determined design parameters. Detecting ability of weld line on butt joint in sheet metal was confirmed by scanning the sensor across the weld line. Experiments were also performed on a variety of materials as cold rolled steel, stainless steel, aluminum, and copper and the detecting abilities were compared with each other. Experimental results have shown that the detecting ability on butt joint of sheet metal is good and the sensor can also be used for height control.

위암환자 전산화단층촬영시 경구조영제로서 물의 유용성에 관한 연구 : Usefulness of Water as an Oral Contrast Agent

정경원,김충현,박청희 충남대학교 의과대학 지역사회의학연구소 1991 충남의대잡지 Vol.18 No.1

Computed tomography is valuable for direct visualization of changes of gastric wall and staging of gastric tumor. Gastric distension is essential for the evaluation of gastric wall. Computed tomography of the gastric wall after sequential ingestion of normal saline to 1000cc, followed by rapid intravenous injection of contrast medium, was performed in 36 patients with known gastric tumors. Three patients were excluded due to incomplete gastric distenstion and the lesion was not detected. Thirtythree patient was analysed preoperatively; the changes of wall were analysed in all patients and CT staging is compared with that of 19 cases who underwent surgery. The results were as follows: 1. All cases are adenocarcinomas. 2. Thickening of gastric wall is detected in all cases and the ulceration within the thickened wall is detected only in five cases among the 25 cases of Borrmann type Ⅱ and Ⅲ. 3. Absence or presence of perigastric fat infiltration is correctly diagnosed in 15 cases among the 19 cases who underwent surgery 4. Lymph node metastasis, is correctly diagnosed in nine cases among the 19 cases 5. Pancreatic metastasis is correctly diagnosed in all cases who General acceptance and tolerance of water as a gastric contrast medium was good in all patients, and water made excellent negative contrast with gastric wall, and there was no side effects.

얼굴 영상 생성을 위한 고유 공간 모델링

김경수,강오형,이양원 群山大學校 情報通信技術硏究所 1997 情報通信技術硏究論文集 Vol.1 No.-

In this paper, we suggests a novel approach which modifies facial images by utilizing eigenvectors without facial image analysis. Eigenvectors are often used in face recognition and expression understanding, since they exhibit good statistical characteristics of a given population. Especially we present how to employ eigenvectors to reconstruct novel facial images. For this purpose, weight vectors in an eigenspace are modeled to from weight vector database and weight vectors in this database are then applied to facial images to generate desired outputs.

익산지역 강수성분의 연차적 변이

이경보,이덕배,이상복,김재덕,박찬원 한국환경농학회 2006 한국환경농학회지 Vol.25 No.1

斷續切削時 超硬工具의 缺損에 관한 硏究

李允景,金元鎰 경남대학교 신소재연구소 1991 論文集 Vol.1 No.-

본 연구의 목적은 기계적 충격에 의한 절단희수의 실험치를 F.W.Taylor의 공구수명방정식을 근거로 하여 절단희수에 대한 확장된 공국수명식을 유도하여 구한 이론치와 비교 하였다. 또한, 공구형상에 대하여 주축회전속도, 이송을 변화시켜 절삭저항 및 절단희수와의 관계를 실험적으로 검토하였으며 결손형태를 공구현미경으로 관찰, 확인하여 최적 가공 조건을 찾고자 함에 있다. 단속절삭의 절단가공식 절단회수를 가장 많이 할 수 있는 최적 절삭조건은 흠이 2개월 경우 510 rpm, 이송 0.052mm/rev, 공구의 최적 형상은 KTP 43-3type(경사각 6°)이었고, 흠이 4개일 경우 396 rpm, 이송 0.052 mm/rev, 공구의 최적 형상은 KTP 43-4type (경사각 6°)이었다. The purpose of this study is investigates the breakage of carbide tools cause to mechanical impact in the intermittent cutting. For this purpose, the cutting speed and the feed rate was took variable for the type of cutting-off tool. First, delieve the tool life equation for flank wear and compared to the theoretical value, and Second, investigates the tool breakage according to the number of impact of the tool, and then find the tool type and the best condition of cutting procedure. Form the experiments, we know that the breakage of cutting tool was increases excessivly with increases of feed rates. Therefore, we know that the excessiv mechnaical impact would avoided when the intermittent cutting to non-machinabiltiy cutting object like carbon steel and choose the tool width, spindle rpm and feed rates well. Form the conclusions, tool breackage occurrence tiny when cut-off turning, and the optimum cutting conditions for the maximum number of pass are N=500rpm, f=0.157mm/rev, the optium geometry of the tool is KTP 43-3 type (rake angle 6°) with two grooves, and N=395rpm, f=0.052mm/rev, the optimum geometry of the tool is KTP 43-4 type (rake angle 6°)with four grooves.

저질에 따른 꼬막(Tegillarca granosa)의 염분내성

한경호,진동수,추은경,이우범,이원교 國立 麗水大學校 環境問題硏究所 2000 環境硏究論文集 Vol.3 No.-

The present study was conducted to know the salinity tolerance of the bloody clam, Tegillarca granosa (Linnaeus) caught in Gang-jin Bay from May to June in 2000. In the experimental groups of sandy-mud, the survival and infiltration rate were not bad at 20~40ppt, but all the bloody clam, Tegillarca granosa died at more than 50ppt and less than 10ppt before the experiment finish. In the experimental groups of muddy, the survival and infiltration rate wrer not bad at 20~35ppt and then 40ppt, 45ppt. All the bloody clam, Tegillarca granosa died at more than 50ppt and less than 10ppt. The infiltration rate was high at 25~35ppt in the both of two experimental groups. In the sandy-mud, the bloody clam, Tegillarca granosa infiltrated less than half of their shells at 25ppt, 30ppt but in the muddy, they infiltrated more than half of their shells at 25ppt, 30ppt, 35ppt.

纖維强化 Plastics의 切削加工에 관한 硏究

金元鎰,李允景,姜渭民 慶南大學校 附設 工業技術硏究所 1991 硏究論文集 Vol.9 No.-

本 硏究에서는 유리纖維 强化樹脂의 旋消時 각 切削 條件에 따른 超音波 振動切削과 常用切削時 나타나는 加工特性을 考察하기 위하여 眞圓度, 表面粗度을 中心으로 比較, 檢討한 結果 다음과 같은 結論을 얻을 수 있었다. 1. 眞圓度의 값은 切削條件 및 振幅에는 많은 影響을 받지 않고, 纖維角이 60˚인 경우 V=60m/min, f=0.08mm/rev, t=0.05mm일때 眞圓度 값이 10㎛로 가장 良好하였고, 纖維角이 90˚인 경우에는 振動切削에서는 19㎛, 常用切削에서는 37㎛로 가장 높은 값이 나타났으며, 振動切削이 常用切削 보다 약 2배 改善되었다. 2. 表面眺度는 纖維角이 60˚인 경우가 가장 良好하고, V=20m/min에서는 振動切削과 常用切削의 값은 거의 變化가 없으며 V=30m/min이상에서는 振動切削이 顯著하게 改善되었다. 3. 工具傾斜角은 眞圓度에는 많은 影響을 미치지 않지만 表面粗度는 0˚보다 6˚가 약간 改善됨을 알 수 있다. 4. 振動切削은 硏削에서 얻을 수 있는 加工精度를 旋削에서도 쉽게 얻을 수 있어 精密度와 生産性을 向上시키는 加工法이라 할 수 있다. In this paper, under different cutting condition on G.F.R.P, ultrasonic vibration cutting and the characteristics in conventional cutting have been studied. So the following conclusion centered on comparison, examination of roundess, surface roughness has been reached. 1. The value of surface roundess doesn't get much effect from amplitude as well as cutting conditions. With 60˚of fiber angle, v=60m/min, f=0.08mm/rev, t=0.05mm, the value of surface roundess, 10㎛, was the best. In case of 90˚, the highest value was 19㎛ in vibration cutting and 37㎛ in conventional cutting vibration cutting has improved about twice as high as conventional cutting. 2. In case the fiber angle was 60˚, surface roundess was little difference between vibeation and conventional cutting. Under v=30m/min and above, vibration cutting has remarkably improved. 3. Even if the tool rake angle doesn't affect the roundess, surface roughness has improved a little more at 6˚than at 0˚. 4. Vibration cutting helps to gain as lathe turing working precision as in grinding, Consequently, it's considered a good working method to improve precision and productivity.

자동차 주행용 광섬유 자이로스코프 개발

이승원,박경섭 울산대학교 1997 공학연구논문집 Vol.28 No.1

적당한 성능의 광섬유 자이로스코프는 자동차 주행용의 회전율 측정 센서로 사용할 수 있다. 본 논문에서 구성한 광섬유 자이로스코프 시스템은 개회로 방식의 신호 처리를 하며, 단일 모드 광섬유와 방향성 결합기를 이용하여 시스템을 광섬유 일체식으로 구성하였다. 광원으로는 비편광 광원인 He-Ne 레이저를 사용하였다. 자동차 주행용으로 사용할 수 있도록 간단한 구성과 저가격이 되도록 하였다. 본 논문에서는 modified J₁…J₄ 방법을 응용한 신호 처리 방식을 사용하였다. 간섭계 출력을 고속 푸리에 변환(fast Fourier transform : FFT)하여 4 개의 연속 고조파를 구한 다음, modified J₁…J₄를 적용하여 변조도(modulation index)를 구한다. 이 방법은 광원의 파장변동이나 편광 상태의 변화 등에 상관없이 계측할 수 있다. 여기서 구한 변조도를 이용하여 Bessel 함수 ??를 계산한 결과와, 두 고조파의 비로 간단하게 회전율을 구할 수 있었다. Fiber-optic gyroscope of modest performance can be used as angular rate sensor for vechile navigation on land. A practical design is used an open-loop configuration with an all-fiber optical system together with single-mode fiber and directional coupler. We use the unpolarized light source, He-Ne laser as light source, and design simple construction for low cost. In this paper, we used the modified J₁…J₄ method which apply the signal processing technique. Measurements were made of the amplitudes of four harmonics in the electrical spectrum of the output of an interferometer using fast Fourier transform(FFT), and modified J₁…J₄ was used to determine the amplitude of the modulation index. This method allowed us independents of the wavelength fluctuation of the wavelength fluctuation of source and state of polarization changes in measurement. We can simply get the rotation rate with two harmonics ratio, Bessel function, ?? and the modulation depth.