• Journal of Mechanical Science and Technology
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• 제18권7호
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• pp.1055-1061
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• 2004

In this research, a vision system for detecting breakages of small-diameter taps, which are rarely detected by the indirect in-process monitoring methods such as acoustic emission, cutting torque and motor current, was developed. Two HMI (Human Machine Interface) programs to embed the developed vision system into a Siemens open architecture controller, 840D, were developed. They are placed in sub-windows of the main window of the 840D and can be activated or deactivated either by a softkey on the operating panel or the M code in the NC part program. In the event that any type of tool breakage is detected, the HMI program issues a command for an automatic tool change or sends an alarm signal to the NC kernel. An evaluation test in a high-speed tapping machine showed that the developed vision system was successful in detecting breakages of small-diameter taps up to M1.

• 한국자원식물학회지
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• 제10권2호
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• pp.151-158
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• 1997

본 연구는 콩계통들의 지방함량이 서로 다른 가상요인에 어떻게 영향을 받는 지를 규명하기 위해 미국 노스캐롤라이나지방의 5개 지역에서 3년에 걸쳐 수행하였다. 각 계통의 지방함량 및 지방수량들이 기상요인에 대한 Linear response가 조사되었고, 또한 최저기상 반응모델을 결정하기 위해 Stepwise Selection Program이 사용되었다. 콩지방함량, 지방수량은 기상 요인인 온도와 강우량에 의해 크게 영향을 받았으며 성숙시기에 온도가 가장 높고, 최고최저 온도범위가 가장 작은 환경에서 지방함량이 가장 낮게 나타났고, 최저온도 변이가 가장 작고 강우량변이가 가장 큰 환경에서 지방수량이 가장 높게 나타났다. 계통들의 대부준으 지방함량이 MxDT, HTD, ADT, ADTRg에 반비례하는 경향을 나타내었으며 이는 성숙시기에 온도가 높아질수록 지방함량이 감소한다는 것을 의미한다. 그러나 NC107은 MxDT, ADT에 비례하는 경향을 보였다. 모든 계통들이 VMnDT, VADTRg, ADRa에 비례하는 경향을 나타내었고 이는 최저온도와 최고최저 온도범위의 변이가 클수록, 평균강우량이 많을수록 지방함량은 증가한다는 것을 의미한다. 11계통이 1개 내지 3개의 기상변수를 가지는 최적기상모델을 형성하였다. 그러나 NC109와 NC105는 모든 기상변수에 유의한 Linear 반응을 나타내지는 않았으나 전자는 2개의 기상변수를 가지는 최적기상모델을 형성하였고 후자는 가지지 않았다. 이는 NC109는 지방 함량이 아마도 기상변수 하나에 의한 영향보다도 2개 변수의 상호작용에 의한 영향이 큰 것으로 추측 할 수 있고, NC105는 지방함량이 기상환경에 상대적으로 더 안정하기 때문인 것으로 생각된다. 위와 같은 사실은 콩지방함량의 기상반응에 대한 품종적 차이가 상당히 크다는 것을 의미한다. 지방수량은 ADTRg와 VADRa에 반비례하는 경향을 나타내었으며 이는 최고최저 온도차이와 평균강수량 변이가 클수록 지방수량은 감소한다는 것을 의미한다.

• 한국공작기계학회논문집
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• 제17권4호
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• pp.112-118
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• 2008

In order to meet the optical performance in the process of the micro lens manufacturing with plastics, it is important to embody accuracy in shape and surface roughness to the intended design. Since it is difficult to machine exactly the mold core of lens fit to the designed shape, in this paper, a simple program using MATLAB is developed for shape correction of the mold core after first machining it. This program evaluates correction parameters(aspheric coefficients and curvature) and generates aspheric NC data for compensating the core surface in prior machining process. The program provides the way to manufacture plastic injection molding lens with aspheric shape of high precision, and is expected to be effective for correction and to shorten the processing time.

• International Journal of Precision Engineering and Manufacturing
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• 제2권3호
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• pp.27-33
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• 2001

The aim of the present work is to propose a model for Computer Aided programming of numerical Control lathe. This model is based on the concept by features. It has been developed in an Artificial Intelligence environment, that offers a rapidity as well as a precision for NC code elaboration. In this study a pre-processor has been elaborated to study the geometry of turning workpiece. This pre-processor is a hybrid system which combine a module of design by features and a module of features recognition for a piece provided from an other CAD software. Then, we have conceived a processor that is the heart of the CAD/CAM software. The main functions are to study the fixture of the workpiece, to choose automatically manufacturing cycles, to choose automatically cutting tools (the most relevant), to simulate tool path of manufacturing and calculate cutting conditions, end to elaborate a typical manufacturing process. Finally, the system generates the NC program from information delivered by the processor.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1998년도 금형가공 심포지엄
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• pp.1-7
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• 1998

본 연구에서는 3차원 솔리드 모델러로부터 Modeling한 후 제작된 model 에 사용자가 원하는 측정 위치를 지정함으로써 자동적으로 측정용 NC Data를 얻을 수 있는 알고리즘을 설계하고 이를 Program화하였다. 3-D Modeler로서 Unigraphics를 사용하였으며, 공작기계는 FANUC Controller를 장착한 Machining Center이다. 측정용 센서는 접촉식 Probe를 사용하였다. 본 연구를 통하여 CAD시스템에서 구축된 Geomaatric Model로부터 직접 측정을 위한 NC data를 얻고 이 data를 가공후의 측정 Data와 비교하여 봄으로써 제품의 가공정밀도를 확인해 볼 수 있으며, 가공시의 간섭 check, 잔삭가공여유, 과절삭등 다양한 정보를 얻을 수 있을 것이다. 향수 지속적인 연구개발을 통하여 data의 통계처리 및 공작기계의 오차 보정등을 고려하여 줌으로써 기계상에서의 측정 data에 대한 신뢰도를 구축할 수 있을 것으로 사료된다.

• 한국정밀공학회지
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• 제16권9호
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• pp.48-53
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• 1999

In this paper, a practical method for design and machining of cycloid gear was investigated. Based on the proposed method, a systematic program was developed for automatically designing the tooth profiles of epicycloid and hypocycloid gears for the case fo one difference between the number of teeth of cycloid gear and the number coordinates of tooth profiles and pressure angles. The error analysis between cycloid curve and Biarc curve was performed to show the effective method of equidistant partitioning of cycloid curve so that efficient method of Biarc curve fitting was also proposed for the partitioned curve.

• 한국정보과학회논문지:시스템및이론
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• 제33권1_2호
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• pp.44-51
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• 2006

본 논문에서는 동시공학적 생산개념을 부재 생산자동화에 적용시킨 웹 기반의 통합 네스팅 시스템을 제안한다. 일반적으로 판재 부재 생산 공정은 정해진 순서에 따라 순차적으로 진행된다. 그러나 본 논문에서는 이들 공정들의 특성을 분석하여 클라이언트/서버 환경에서 운용될 수 있도록 분산 설계하였다. 그리고 판재 부재 생산에 필요한 부재 CAD, 네스팅, 부재 CAM, NC포스트프로세서 기능들을 웹 환경에서 다수의 작업자가 시스템에서 일괄 처리할 수 있도록 구현하였다. 개발된 시스템은 기존의 상용시스템에 비해 생산 자동화의 통합작업 환경을 제공할 수 있고, 작업자간의 공동작업이 가능하며, 작업대기 시간을 단축할 수 있음을 입증하였다. 본 논문은 부재생산 자동화분야에 컴퓨터 시스템 기술들을 접목함으로서 공장자동화의 효율성과 생산성 향상에 기여할 수 있음을 증명하였다.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2002년도 춘계학술대회 논문집
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• pp.284-289
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• 2002

In this paper, we develop a six-axes machining center tool(MCT) and CAD/CAM system based RAD Tool Program. The MCT consists of two mechanical parts, i.e., a X-Y-Z Cartesian coordinate typed MCT and a parallel-typed tilting table. Kinematics and singularity are accomplished to design the parallel-typed tilting table, and RAD Tool Program Is developed for the six-axes MCT, which requires the commands of position as well as orientation for machining of complex shape. In RAD Tool, the CAD/CAM system has a tool path generator, NC code generator and a graphic simulator. This paper designs the parallel-typed tilting table to meet the desired specification and presents the results of CAD/CAM system based RAD Tool Program.

• Animal Bioscience
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• 제35권1호
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• pp.87-95
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• 2022

Objective: This study was conducted to investigate the effect of associating calcium butyrate with tannin extract, compared to an antimicrobial on the growth performance, incidence of diarrhea, intestinal histology, immune-expression of cyclooxygenase-2 (COX-2) and tumor necrosis factor α (TNF-α) in piglets. Methods: Seventy-two piglets (36 barrows and 36 gilts) weaned at 28±2 d and initial body weight of 7.17±1.07 kg were allocated to 3 treatments in a randomized complete block design with 8 replicates per treatment and 3 animals per experimental unit. Treatments were composed of NC, negative control: basal diet without additives; PC, positive control: basal diet + 40 mg/kg of colistin sulfate; or BT, basal diet + calcium butyrate + tannin extract. The butyrate and tannin inclusion levels were 0.15% in the pre-starter phase and 0.075% in the starter phase. Incidence of diarrhea was monitored daily, and on d 14 and 35 of experiment, 1 animal from each experimental unit was slaughtered to collect intestinal samples. Results: No significant differences were observed for growth performance. The butyrate-and tannin-based additive resulted in reduced (p<0.05) incidence of diarrhea in piglets during d 1 to 14 and d 1 to 35 in comparison with the other treatments. Piglets that consumed the diet containing the calcium-butyrate and tannin showed a lower (p<0.05) crypt depth in the duodenum than those receiving the NC treatment at 14 d of experimentation. The BT treatment provided a lower (p<0.05) immune-expression of COX-2 at 14 d and TNF-α at 35 d in the duodenum. Conclusion: Association between calcium butyrate and tannin extract resulted in a significant decrease in the incidence of diarrhea and inflammatory process in the duodenum of piglets. Therefore, calcium-butyrate combined with tannin could be a part of an alternative program to reduce the use of antimicrobials in the diet of weaned piglets.

• Journal of Biosystems Engineering
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• 제16권3호
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• pp.228-238
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• 1991

Cam plays very important roles due to continuous requirement for the high-speed and automation of the machinery. A large number of studies of cam curve were carried out by many researchers, and CNC milling and machining center for manufacturing cam have been widely used recently. The purpose of this study was to develop a CAD/CAM system for cam using QuickBasic language in 16-bit PC for application of cam design and manufacturing. Results obtained were as follows : 1. It was possible to input data by entering cam angle and its corresponding R, from 0 to 360 deg. of cam angle. The tediousness at entering data was minimized because of the same data format for both cylindrical cam and disc cam, and free format used for data file. 2. It was possible to design cam by choosing only the number of cam curve because of developing the CAD/CAM program with dimensionless method of cam curves including widely used 19 kinds. After selecting the number of the cam curve, the CAD/CAM system automatically shows the characteristics of cam motion enough to help a designer to decide : displacement, velocity, acceleration and jerk. 3. It was possible to execute, in an efficient way, both the cam profile synthesis and the generation of NC program for CNC machining center by using the input data. 4. This NC program generated by the CAD/CAM system developed here, was evaluated as positive in relation with actual manufacturing experiments and thought to be useful in its application without any modification. It can be said that this CAD/CAM system could be used by the beginners to design and manufacture the cam automatically as the system consists of very simple dialogue methods. In addition, self-developed QuickBasic would be would used as a basic tool for further stuides in this area of research, together with application.