• Journal of the Korean Magnetics Society
• /
• v.18 no.2
• /
• pp.58-62
• /
• 2008

$Ni_{0.4}Zn_{0.4}Cu_{0.2}Fe_2O_4$ ferrite was fabricated by solid stat reaction method and sol-gel method. Because of the drawbacks of each method, we combined these two methods together. We proposed and experimentally verified that nanocrystalline ferrite additive was effective on improving the densification behavior and magnetic properties of NiZnCu ferrites for multilayer chip inductors. The initial permeability of the toroidal core Sample with 20 wt% nanocrystalline ferrite increased from 78.1 to 178.2 as annealing temperature is increased from $880^{\circ}C$ to $920^{\circ}C$. The density, shrinkage and saturation magnetization were increased with increasing annealing temperature, which was attributed to the decrease of additive grain size and increase of sintering density.

• Journal of the Korean Society of Manufacturing Technology Engineers
• /
• v.9 no.4
• /
• pp.75-84
• /
• 2000

The main goal of our research is to compensate the milled surface errors induced by the tool deflection effects, which occur during the milling process. First, we predict cutting forces and tool deflection amount. Based on predicted deflection effects, we model milled surface shapes. We present a compensation methodology , which can generate a new tool trajectory, which is determined so as to compensate the milled surface errors. By considering manufacturing tolerance, tool path compensation is generalized. To validate the approaches proposed in this paper, we treat an illustrative example of profile milling process by using flat end mill. Simulation and experimental results are shown.

• 동물약계
• /
• no.109
• /
• pp.4-8
• /
• 2007

한국동물약품협회 김진구 회장 취임/동물약사감시 행정처분 결과 홍보/동물약사심의위원회 위원 추천/동물용의약품등 자율점검제 실시 결과/2007년도 병역지정업체 산업기능요원 배정/동물용의약품 PL 단체보험 계약 갱신/농업연수원 교육훈련 수요 조사/VIV ASIA 2007 산업자원부 지원대상 선정/수출촉진협의회 개최/제1차 이사회 개최/협회 품목신고 요령 설명회 개최/검역원 동물약품 간담회 및 공청회 참석/제2차 이사회 개최/제15차 정기총회 개최/식약청 잔류동물용의약품 전문위원회 참석/동물약품 제조용 할당관세 적용 유당 배정/동물용의약품 등 제조업체 현황/동물용의약품 등 수입자 현황/국내생산 동물용의약품 연도별 판매 현황/국내생산 동물용의약품 연도별 수출 현황/수입완제 동물용의약품 연도별 판매 현황/동물용의약품 연도별 내수 시장 규모/동물용의약품 약효별 허가(신고) 현황/내수 유통경로별 판매 현황(원료제외)/축종별 판매 현황(원료제외)/원료 동물약품 원산지별 수입 현황/완제 동물약품 원산지별 수입 현황

• Journal of the Korean Society of Manufacturing Technology Engineers
• /
• v.24 no.1
• /
• pp.98-102
• /
• 2015

This paper proposes an autonomous navigation method for a nonholonomic mobile robot, based on the generalized Voronoi diagram (GVD). We define the look-ahead point for a given motion constraint to determine the direction of motion, which solves the problem of a minimum turning radius for the real nonholonomic mobile robot. This method can be used to direct the robot to explore an unknown environment and construct smooth feedback curves for the nonholonomic robot. As the trajectories can be smoothed, the position of the robot can be stabilized in the plane. The simulation results are presented to verify the performance of the proposed methods for the nonholonomic mobile robot. Furthermore, this approach is worth drawing on the experience of any other mobile robots.

• VENDING MACHINE INDUSTRY
• /
• no.autumn
• /
• pp.119-166
• /
• 2000

전기용품안전인증제도가 올 7월부터 새롭게 바뀌었다. 이같은 개정은 전기용품의 안전관리 제도가 국제적인 기준에 부합하지 아니하므로 정부에 의한 형식승인제도를 민간기관에 의한 안전인증제도로 전환함으로써 전기용품의 제조 및 안전관리를 선진화하기 위함이다. 개정의 주요 골자를 살펴보면 종전에는 전기용품중 화재$\cdot$감전 등의 위험 또는 장해가 발생할 가능성이 높은 전기용품에 형식승인을 받도록 하던 것을, 앞으로 제품을 모델별로 안전승인기관의 안전인증을 받아 제조하도록 하고, 화재$\cdot$감전 등의 위험 또는 장해가 발생할 가능성이 적은 전기용품에 대해서는 자율적으로 안전인증을 받을 수 있도록 했다. 새롭게 바뀐 전기용품안전인증제도에 대해 관련업체들이 혼선 없이 잘 대처할 수 있게하기 위해 ${\lceil}$전기용품안전인증, 이렇게 달라진다${\rfloor}$를 특집으로 준비했다.

• Electronics and Telecommunications Trends
• /
• v.35 no.1
• /
• pp.60-70
• /
• 2020

Artificial intelligence (AI) is expected to bring about a wide range of changes in the industry, based on the assessment that it is the most innovative technology in the last three decades. The manufacturing field is an area in which various artificial intelligence technologies are being applied, and through accumulated data analysis, an optimal operation method can be presented to improve the productivity of manufacturing processes. In addition, AI technologies are being used throughout all areas of manufacturing, including product design, engineering, improvement of working environments, detection of anomalies in facilities, and quality control. This makes it possible to easily design and engineer products with a fast pace and provides an efficient working and training environment for workers. Also, abnormal situations related to quality deterioration can be identified, and autonomous operation of facilities without human intervention is made possible. In this paper, AI technologies used in smart factories, such as the trends in generative product design, smart workbench and real-sense interaction guide technology for work and training, anomaly detection technology for quality control, and intelligent manufacturing facility technology for autonomous production, are analyzed.

• Journal of the Korean Society for Precision Engineering
• /
• v.29 no.4
• /
• pp.373-379
• /
• 2012

Disruptions in manufacturing systems caused by system changes and disturbances such as the tool wear, machine breakdown, malfunction of transporter, and so on, reduce the productivity and the increase of downtime and manufacturing cost. In order to cope with these challenges, a new method to build an intelligent manufacturing system with biological principles, namely an ant colony inspired manufacturing system, is presented. In the developed system, the manufacturing system is considered as a swarm of cognitive agents where work-pieces, machines and transporters are controlled by the corresponding cognitive agent. The system reacts to disturbances autonomously based on the algorithm of each autonomous entity or the cooperation with them. To develop the ant colony inspired manufacturing system, the disturbances happened in the machining shop of a transmission case were analyzed to classify them and to find out the corresponding management methods. The system architecture with the autonomous characteristics was generated with the cognitive agent and the ant colony technology. A test bed was implemented to prove the functionality of the developed system.

• Journal of the HCI Society of Korea
• /
• v.14 no.2
• /
• pp.49-60
• /
• 2019

With the appearance of self-driving cars and electric cars, the automobile industry is rapidly changing. In the midst of these changes, HMI studies are becoming more important as to how the driver obtains safety and convenience with controlling the vehicle. This study sought to understand how automobile manufacturers understand the driving situation, and how they define and limit driver interaction. For this, prior studies about HMI were reviewed and 15 participants performed an on-road study to drive vehicles from five manufacturers with using their interfaces. The results of the study confirmed that buttons and switches that are easily controlled by the user while driving were different from manufacturer to manufacturer. And there are some buttons that are more intensively controlled and others that are difficult to control while driving. It was able to derive 'selection and concentration' from Audi's vehicle, 'optimization of the driving ' from BMW's, 'simple and minimize' from Benz's vehicle, 'remove the manual distraction' from the vehicle of Lexus, and 'visual stability' from KIA's vehicle as the distinctive keywords for the HMI. This shows that each manufacturer has a different definition and interpretation of the driver's driving control area. This study has a distinct value in that it has identified the characteristics of vehicle-specific HMI in actual driving conditions, which is not apparent in appearance. It is expected that this research approach can be useful to see differences in interaction through actual driving despite changes in driving environment such as vehicle platooning and self-driving technology.

• Journal of the Korean Magnetics Society
• /
• v.12 no.2
• /
• pp.51-56
• /
• 2002

Permalloy thin films fabricated by rf magnetron sputtering showed the excellent magnetic properties, i.e., an effective permeability of over 2000 at 1$\mu\textrm{m}$ thick up to 10 MHz, a saturation magnetization of 10∼12 kG, a coercive force of 0.2∼1 Oe, resistivity (p) is 20 ${\mu}$$\Omega$cm. In order to control the magnetic anisotropy direction of the films in a wafer scale, two parallel Nd-Fe-B permenant mangnets were used to provide the magnetic field during the sputtering process. As a result, the anisotropy direction was successfully controlled when the two magnets were seperated with a distance of 70 mm. 3D simmulation of the magnteic fields around the wafer during sputtering were in accord with the above result.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
• /
• v.11 no.3
• /
• pp.145-155
• /
• 2016

The purpose of this study is to review the relationship between empowerment and innovative behavior, and the moderating effect of psychological ownership in small business. In order to verify and achieve the purposes mentioned above, questionnaire data are gathered and analysed from 315 employees in manufacturing enterprises of Kangwon-do province. Multiple regression and multiple hierarchical regression analysis were applied to test the proposed hypotheses: 1) the relationship between empowerment(meaning, autonomy, self-efficacy, impact) and innovative behavior(idea development, idea implementation), 2) the moderating effect of PO(psychological ownership for organization) on the relationship between empowerment and innovative behavior, 3) the moderating effect of PJ(psychological ownership for job) on the relationship between empowerment and innovative behavior. Empirical survey's findings are as follows; First, empowerment(meaning, autonomy, self-efficacy, impact) appeared to be positively related with innovative behavior(idea development, idea implementation). Second, there was no evidence of moderating effect of PO on the relationship between empowerment and innovative behavior. Third, meaning of work was more positively related with innovative behavior(idea development, idea implementation) in higher PJ group than in lower PJ group. Fourth, impact was more positively related with idea implementation in higher PJ group than in lower PJ group.