• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2004년도 춘계학술대회 논문요약집
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• pp.188-188
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• 2004

Modal testing and analysis is a primary tool for obtaining reliable models to represent the dynamics of structures. When a structure is tested in order to collect measured data in modal testing, we usually use attached accelerometers to pick up the response data. Change in modal parameters due to the mass of transducers in modal testing is a well-known problem. The disadvantages are the shift of measured modal frequencies and the change of modal shapes, which can cause inaccurate results in further analysis. Modal analysis methods in frequency domain are based on a set of measured frequency response functions(FRF).(omitted)

• 한국경영과학회지
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• 제20권3호
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• pp.77-104
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• 1995

Intelligent Decision System support the decision analysis process in the managerial problems with decision analytic knowledge as well as domain specific knowledge. Influence Diagram has been one of the major knowledge representation in the intelligent decision system. In the development of intelligent decision system, knowledge acquisition is also known to be difficult. This paper suggests a developing tool using an influence diagram and Verbal Protocol Analysis which facilitates knowledge acquision for intelligent decision system. An ennvironmental decision making problem is used as an illustrative example and validation of the suggested developing tool is discussed. The suggested tool is very flexible to be expanded or applied to similar problems.

• 한국CDE학회논문집
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• 제3권3호
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• pp.177-182
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• 1998

The computer related techniques have been developed rapidly in the field of metal removal industry. The electronic catalog for mechanical elements is one of such developments realized in recent years. As the emergence of the electronic catalogs in the 90s, it breaks the restriction of the traditional catalog and becomes a helpful and efficient tool in the field. In this paper, we develop an electronic catalog for the cutting tools of the Korea Tungsten Co. Ltd. The catalog consists of three parts: a preprocessor for tool selection, a database for tool, and a postprocessor for search result. A preprocessor for tool selection is developed under a user-friendly consideration. A database for tool consists of milling, drilling, and reaming tools with a list of cutters, inserts, and components. A postprocessor for search result consists of weight, dimension. drawing, product order number etc. of the tools. It also suggests the optimized cutting condition of the selected tool using a neural network technique which is done by an independent research group.

• 한국조리학회지
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• 제9권1호
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• pp.101-120
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• 2003

The today society comes wind important position we and the economic room gets and our dietary life simple ´it eats,´ is not only the act which is primary work, ´it enjoys,´, ´appreciates´with culture dimension to execute, becoming, it fellowed hereupon and with the aesthetics idea which pursues the quality of change and life of our dietary life there is to a culture and the repast tool which is an essential width enjoyed from meaning as the jar tool and with meaning as the object and it will be able to appreciate it developed it came. The research which it sees the repast fool of the Orient and the West it is appropriate from dietary life and it uses to respect with It observes the understanding of the chopsticks and the cutlery. With the repast tool development and evolution or it undergoes the process of change and comparison analyzes becomes the all chopsticks and the cutlery with each other and the understanding for the culture collision and a culture harmony of the heterogeneous element which bisection is objective of research.

• 한국분말재료학회지
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• 제22권3호
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• pp.157-162
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• 2015

SKD11(ASTM D2) tool steel is a versatile high-carbon, high-chromium, air-hardening tool steel that is characterized by a relatively high attainable hardness and numerous, large, chromium rich alloy carbide in the microstructure. SKD11 tool steel provides an effective combination of wear resistance and toughness, tool performance, price, and a wide variety of product forms. Adding of CNTs increased the performance of mechanical properties more. 1, 3 vol.% CNTs was dispersed in SKD11 matrix by mechanical alloying. SKD11 carbon nanocomposite powder was sintered by spark plasma sintering process. FE-SEM, HR-TEM and Raman analysis were carried out SKD11 carbon nanocomposites.

• 한국치위생학회지
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• 제19권1호
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• pp.1-17
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• 2019

This study investigates the overall research trends and related factors affecting the turnover of dental hygienists in Korea during the past 10 years (2007-2017) and analyzed the differences in the results of the research according to the main measurement tools. The literature review focused on turnover of dental hygienists in Korea. Inclusion criteria of selected studies were as follows: the domestic and foreign academic journals and theses published for the past 10 years (between 2007-2017). The most commonly used tool for measuring dental hygienist turnover was a tool developed by Lawler. The most used significant general characteristics is age and income, Job satisfaction (57.1%) and organizational commitment (40.0%) were the most frequently used predictors of turnover. The variables used for each turnover measurement tool were different, showing that the study results was different from according to the variables and significance level. Although there have been many studies related to the turnover of dental hygienists, different results have been shown depending on the measurement tools. When conducting research related to dental hygienist turnover, specific and clear presentation of measurement tool selection or development is needed.

• 대한금속재료학회지
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• 제47권10호
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• pp.667-674
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• 2009

High temperature wear of STD 61 tool steels sliding against the Al-9%Si coated steels used for hot press forming has been studied in comparison with that of the tool steels sliding against the uncoated steels. Wear tests have been performed using a pin-on-disc configuration under an applied normal load of 50N for 20 min with heating the coated and uncoated steels up to 800$^{\circ}C$. It was found on the worn surface of the STD 61 tool steels sliding against the Al-9%Si coated steels that the formation of the glazed layers containing Al transferred from the coated tribopair may contribute to a reduction of the coefficient of friction, and detachment in part occur due to delamination wear, resulting in higher specific wear rate. On the other hand the Fe-oxide wear debris entrapped on the softer surface of the uncoated steels can act as a tribosurface, leading to decreased adhesive wear of the STD 61 tool steels, resulting in a lower specific wear rate.

• 공학교육연구
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• 제17권4호
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• pp.58-61
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• 2014

This paper introduces a tool for effective teaching of introductory computer programming. In order for the class to be effective, we try to attain attention, relevance, confidence, and satisfaction based on Keller's ARCS model. A web-based tool is developed to help both the students and the instructors.

• 한국생산제조학회지
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• 제22권5호
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• pp.782-788
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• 2013

This study addresses the issue of safety of the splash guard of a computer numerical control (CNC) machine tool at the design stage. As an impact test for evaluating safety requirements such as strength under the safety regulation is an expensive and iterative task, it is necessary to develop a new method to minimize the task of the impact test for development of the machine tool. In this study, explicit finite element method was adopted for replacement of the impact test of the splash guard of a machine tool at the design stage. A finite element model was developed for implementing the impact test on an actual vertical CNC lathe and then produced the analysis including plastic strain and deformation to enable the safety of its splash guard to be determined. The analysis results demonstrated that the finite element method can be applied to safety evaluation for design of the splash guard of a CNC machine tool.

• 한국공작기계학회논문집
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• 제11권2호
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• pp.17-23
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• 2002

A cylindrical capacitance-type spindle displacement sensor was developed and its effectiveness as a system to monitor cutting forces during hard turning was tested in this research. The sensor was installed between the face of spindle cover and the chucking element and measured pure radial motion of the spindle under the condition with presence of roundness error at measured surface. To prove the effectiveness of the developed system hard aiming tests using ceramic inserts and tool steel as workpiece were conducted. The workpiece was hardened up to 65 Rc. The variations of pure radial motion of the spindle ware measured during the cutting tests. The signals from the sensor showed the same pattern of cutting force variations from the tool dynamometer due to the progress of tool wear. As the flank wear of the ceramic tool increased both static component of cutting forces and the amount of center shift of spindle orbit increased, Results from the research showed that the developed sensor could be utilized as an effective and cheap on-line sensing device to monitor cutting conditions and tool performance in the un-manned machining center.