미세 펀칭 구멍의 디버링 특성에 관한 연구

안병운,최용수,박성준,윤종학 한국공작기계학회 2003 한국공작기계학회 추계학술대회논문집 Vol.2003 No.-

In micro hole punching process the burr occurs inevitably, but the burr must be minimized in order to improve the quality and accuracy of the product. In this study, magnetic field assisted polishing technique is applied to remove the burr which exists in nozzles for ink jet printer head and proved to be a feasible for deburring by experiment. The deburring characteristics of sheet metals was investigated changing with polishing time. After the deburring, the burr size has remarkably reduced and roundness of the hole also has improved.

객체지향 테스팅을 지원하는 전통적인 테스팅에 관한 연구

안종근,추연수,이진영 순천향대학교 부설 산업기술연구소 1998 순천향 산업기술연구소논문집 Vol.3 No.3

Computer software is widly used such as nuclear electric development, missle system, large scale industrial process etc. In these systems, small mistake may bring on serious damage. There are unit testing, integration testing, and system testing by the view of scale. Also there are functional testing and structral testing by the view of methodology. There are some trouble-such as inheritance, encapsulation, and reusable-object-oriented program apply to procedural program testing in unit testing. However object-oriented program testing is need for additional consideration. Object-oriented program is constitute interaction of message. So almost object-oriented program testing is focus to functional testing. But functional testing technique cannot find error because don't know implementation of program. In this paper, I suggest Class Call Graph in order to know how interaction object and function. And then perform traditional testing technique to object-oriented program testing.

공단지역 및 청정지역 식물 잎권의 잎표면세균 및 내산성세균의 분포

안종훈,방숙진,한남정,송왕영,황소영,이인수,박성주 대전대학교 이과대학 기초과학연구소 1997 自然科學 Vol.- No.-

산성강하물의 영향을 받는 대천공단지역과 영향을 받지 않는 청정지역인 대전 계족산 자연휴양림에서 자라는 밤나무(Castanea crenat)의 잎표면에서 서식하는 총세균수, 생존세균수, 종속영양세균수, 내산성세균수를 1996년 8월부터 1997년 8월까지 5회에 걸쳐 조사하였다. 공단지역 잎표면 평균 총세균수, 생존세균수 및 종속영양세균수는 각각 9.9×10^(5) cell/㎠, 1.6×10⁴cell/㎠, 7.1×10³cell/㎠,로서 청정지역에 비하여 각각 1.5배, 2배, 2.6배 정도로 관찰되었다. MPN법으로 측정한 pH 5.6애서의 잎표면 내산성세를수는 공단지역 3.3×10⁴, 청정지역 3.4×10⁴MON/㎠로 거의 같았고, pH 4.0에서의 내산성세균수는 공단지역애서 1.9×10^-(-1)MPN/㎠인 반면 청정지역에서는 전혀 검출되지 않았다. pH 3.0에서의 내산성 잎표면세균수는 공단지역과 청정지역의 잎권 어느 곳에서도 검출되지 않았다. 한편 계절별 잎표면세균수의 분포는 대체로 잎이 나기 시작하여 크기가 가장 작은 5월에 최대를, 그리고 낙엽이 지는 11월에 최소를 나타내었다. 이런 결과는 공단지역의 대기오염물질의 침적이 주변의 식물 잎표면 세균수를 감소시키지는 않으며, 특히 산성강하물의 영향으로 내산성세균수가 증가함을 보여주고 있다. Total, direct viable count, and acid-tolerant epiphytic bacterial population sizes were quantified on leaves of chestnut tree (Castanea crenata S. et Z.) near Taejon Industrial Estate affected by acid precipitation and deposition as well as in the clean natural forest area, Mt. Kyejok, in Taejon city from August 1996 to August 1997. Geometric mean numbers of total, direct viable count, and acid-tolerant epiphytic bacteria were 9.9×10^(5) cell/㎠, 1.6×10^(6)cell/㎠, and 7.1×10³cfu/㎠ respecfvely, being 1.5, 2, and 2.6 times those in the clean area. Acid-to-lerant epiphytic bfcterial numbers at pH 5.6 by MPN method were 3.3×10" in the industrial area, about the same as the number,3.4×104 MPNicni, of the clean area. Acid-tolerant bacterial number at pH 4.0 was 1.9×10^(-1)MPN/㎠ in the industrial area, whereas none was detected in the clean area. Acid-tolerant bacteria at pH 3.0 were not detected at all in the industrial area as well as in the clean area. Epiphytic bacterial population sizes were generally the greatest in May when leaves are emerged and grew but the lowest in November when defoliation occurs. These results showed that air pollutant deposition on leaves did not cause a deuease of epiphytic bacteria at least and acid deposition on leaves did cause an increase of acid-tolerant bacteria.

Paper Drain에 의한 지반개량의 효과와 거동예측

안종필,이관수 朝鮮大學校 建設技術硏究所 1999 建設技術硏究 Vol.19 No.2

If a structure is built up on soft clay foundation, the time for constructing the structure should be shorten considerably and the consideration to the safety of the structure should be taken very carefully. Therefore, in order to meet the conditions specified in advance. Paper Drain pilot test construction results, one of the improvement methods of soft clay foundations, are analyzed and compared between an original design and a pilot test to testify the effect of the improvement methods applied for and then the monitoring results from the field tests are used for assuming the movements thats are to be or coming hereafter in soft clay foundation. The main results are summarized as follows : (1) According to the laboratory test results, the physical property of soil was presented to be stable since the natural water content ratio was reduced 47.6% and was under Liquid Limit. (2) After improving the soil foundation, the undrained shear strength was increased by about 3~4 t/m2. (3) According to the gradual analysis of settlement using hyperbolic method, the consolidation ratio did not reached to 90% when compared with the real data so it will be necessary to reduce the span of construction to paper drain.

횡단형 FIR 적응 등화기의 안정도 및 수렴속도의 향상에 관한 연구

安斗守,金鐘夫 成均館大學校 科學技術硏究所 1993 論文集 Vol.44 No.1

After the receive filter, an adaptive equalizer is employed to recover the transmitted data in the presence of channel distortion. The FIR adaptive equalizer are built from a Walsh network and an LMS algorithm. The Walsh network is employed as an adaptive equalizer for which an algorithm for recursively adjusting the tap gain coefficients minimizing the mean square error. The Walsh network consists of a Walsh and Block pulse functions. In this paper, minimization of the mean square error is accomplished by the now well-known LMS algorithm. In the LMS algorithm, the convergence factor is an important design parameter because it governs stability and convergence speed, which depend on the proper choice of the convergence factor. The conventional adaptation techniques use a fixed time constant convergence factor by the method of trial and error. In this paper, we proposed an optimal method in the choice of the convergence factor.

적응모형화의 성능향상을 위한 시변 수렴인자 결정법

안두수,심재선,김종부 成均館大學校 科學技術硏究所 1992 論文集 Vol.43 No.1

This paper presents an algorithm for improvement of convergence in Adaptive Filter. The proposed algorithm employes the time-varying Convergence Factor to Data-Reusing BLMS adaptation algorithm. Computer simulation for Adaptive Modeling of time-invarying and time-varying unknown systems has been performed. Performance comparisons between LMS, BLMS algorighms which have fixed Convergence Factors obtained by trial and error and the proposed algorithm which has time-varying Convergence Factor show that the proposed algorithm is superior to LMS and BLMS algorithm with respect to speed and accuracy of adaptation.

블럭펄스 변환에 의한 비선형계의 준최적제어에 관한 연구

안두수,이명규,김종부,고영기 成均館大學校 科學技術硏究所 1990 論文集 Vol.41 No.1

This paper presents a method of suboptimal control for nonlinear systems via block pulse transformation. The adaptive optimal control scheme proposed by J.P. Matuszewski is introduced to minimize the performance index. Nonlinear systems are controlled using the obtained optimal control via block pulse transformation. The proposed method is simple and computationally advantageous. Viablity of the this method is established with simulation results for the van der Pole equation for comparision with other methods.

셀레늄이 반추위내 발효특성과 착유우의 유량 생산에 미치는 영향

안종호,김범수 안성산업대학교 2003 論文集 Vol.35 No.-

Two consecutive experiments were conducted in this study to find the effects of adding selenium into ruminant diets by sources(NaSeO3, Se-proteinate) and levels (0.5ppm, 1ppm) ; in vitro experiment using rumen fluid on rumen fermentation characteristics and in vivo experiment using 15 dairy cows on milk yield. 1. In in vitro study, diets including 3kg concentrate, 8kg TMR, 2.5kg timothy and 1.5kg rice straw added by selenium were incubated in ruminal fluid and it showed after 48 hour incubation that DM digestibilities were higher in selenium added diets than control group however with no statistical significance ; control (C) 49.26%, 0.5ppm inorganic additives (0.5IS) 64.15%, 1ppm inorganic additives (1IS) 60.82%, 0.5ppm organic additives (0.5OS) 54.48, 1ppm organic additives (10S) 60.88%. NH3 concentrations after 48 hour incubation, were 12.16 in C, 14.33 and 12.19 in 0.5IS and 1IS and 13.57 and 10.88mg/100m1 in 0.5OS and 1OS, respectively but without statistically significant difference. 2. In in vivo experiment using dairy cows, the diets of 10kg concentrate, 3.2kg Alfalfa, 1kg Timothy, 2kg cotton seed, 2.1kg beet pulp, and 1kg Sudan grass added by selenium in different sources and levels were provided. Milk yields were revised as percentage on the basis of pre-experiment records. Milk yield in 4 week period when selenium feeding was stopped, C decreased by 3.08% and 0.5IS and 1IS decreased by 6.41 and 8.43% respectively, but 0.50S and 10S increased by 3.01 and 6.26% (P<0.05), respectively. 3. From the above results, no effects of selenium, in vitro appeared on fermentation characteristics in the rumen, however in vivo experiment showed that organic selenium source (Se-proteinate) increased milk yields of dairy cows.

안정도를 고려한 다변수계의 모델축소

안두수,김민형,이한석,김종부 成均館大學校 科學技術硏究所 1993 論文集 Vol.44 No.2

This paper presents model reduction method of multivariable systems using orthogonal transformation based on dominant pole retention method in time domain. The reduced model which is designed by presented method preserves stability if the original system is stable and computational advantages are obtained through the use of orthogonal functions.

2段曝氣方法에 의한 染色廢水處理

安鍾洙,朴出在,金秀生 동아대학교 환경문제연구소 1988 硏究報告 Vol.11 No.1

Dye waste water was treated by 2 step aeration method and the efficiency relative to detention time. MLSS and sludge loading was analyzed and following conclusion was obtained. 1. Detention time should be maintained at least more than 30 hours to treat and stabilize waste water in the 1 step and 2 step with BOD. COD being less than 100㎎/ℓ. At 1 step BOD was removed more than 20%. COD was removed more than 40%, at 2 step it was turned out to remove BOD more than 95%, COD more than 75%. 2. With moderate MLSS being maintained at 1,000-1,300 ㎎/ℓ, BOD was removed more than 20%, COD more than 40%, and at 2 step with MLSS being about 4,000㎎/ℓ. BOD was removed more than 90%, and COD more than 80%. 3) As sludge loading varies, at 1 step, without any significant change. It was shown that BOD was removed at stabilized efficiency of 10-40% and at 2 step. BOD was removed more than 90% at the loading of 0.3㎏ BOD/㎏. MLSS. d. COD was removed between 50-70% at the loading of less than 0.07㎏ COD/㎏. MLSS. d.