• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2000.11a
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• pp.429-432
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• 2000

본 논문의 정수기는 영동산 일라이트를 필터의 주된 재료로 사용하였다. 구조는 여과필터를 교체하여 사용할 수 있도록 된 정수기의 필터 케이스 및 여과 방법에 관한 것으로써, 보다 상세하게는 필터 케이스가 분리, 결합이 간편한 본체와 마개로 구성되어 있다. 이 본체는 1차 여과부와 2차 여과부로 분리되어 물이 1차 여과부의 상부를 통해 인입되어 2차 여과부의 상부로 연결되도록 되어 있어 동일한 크기 내에서 여과구간이 2배로 길어져 여과 효율이 우수한 동시에 물인입구와 물배출구가 동일한 방향에 위치하여 다수 개의 필터 케이스를 연결할 때 필터 케이스의 간격을 좁힐 수 있어 필터 케이스의 설치면적이 좁다. 본체와 마개의 체결방식은 볼트 체결방식으로 되어 있으며, 마개는 플라스틱 재질이어서 본체에 마개를 단단히 체결하면 누수가 방지되도록 되어있다. 즉, 정수기의 필터하우징 성능과 영동산 일라이트가 가지고 있는 기능성을 이용한 필터를 사용함으로써 정수기에서 요구되어지는 정수능력을 가진 정수기를 개발 보고한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.4
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• pp.35-42
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• 2019

Nut fasteners that require ultra-precise control are required in the overall manufacturing industry including electronic products that are currently developing with the automobile industry. Important performance factors when tightening nuts include loosening due to insufficient fastening force, breakage due to excessive fastening, Tightening torque and angle are required to maintain and improve the assembling quality and ensure the life of the product. Nut fasteners, which are now marketed under the name Nut Runner, require high torque and precision torque control, precision angle control, and high speed operation for increased production, and are required for sophisticated torque control dedicated to high output BLDC motors and nut fasteners. It is demanded to develop a high-precision torque control driver and a high-speed, low-speed, high-response precision speed control system, but it does not satisfy the high precision, high torque and high speed operation characteristics required by customers. Therefore, in this paper, we propose a control technique of BLDC motor variable speed control and nut runner based on vector control and torque control based on coordinate transformation of d axis and q axis that can realize low vibration and low noise even at accurate tightening torque and high speed rotation. The performance results were analyzed to confirm that the proposed control satisfies the nut runner performance. In addition, it is confirmed that the pattern is programmed by One-Stage operation clamping method and it is tightened to the target torque exactly after 10,000 [rpm] high speed operation. The problem of tightening torque detection by torque ripple is also solved by using disturbance observer Respectively.

• Tribology and Lubricants
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• v.27 no.6
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• pp.332-337
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• 2011

The object of this experimental study is to investigate influences of vibrator amplitude on clamping force in vibration for bolted joint. The experiment is that change the vibrator amplitude to check clamping force. also the friction coefficient calculated by equation to use an obtained in experiments. The main purpose of generation vibrations is decreasing the clamping force dispersion. also If vibration occurs while tightening the bolt is reduced coefficient of friction. In this paper, In experiments to measure the clamping force before vibrator's amplitude changing. Vibrator's amplitude changes to 5.5mm from 4.4mm. As a result, under various vibration condition, relationship of clamping force and Vibrator amplitude.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2013.04a
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• pp.188-189
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• 2013

본 논문에서는 산업현장과 교육시설에서의 가정용 소형 단상변압기의 규격품 사용 여부와 운영상의 안전성 실태를 분석하였다. 전기용품 안전 관리법에 따른 법정인증을 받지 않은 제품이 5개 조사되었으며, 단자 체결형 변압기의 경우 전원선 접속 불량(헐거움), 설치 및 고정 불량, 접지 미체결(누락), 전압조정 핸들 파손, 변압기 상부 가연물 방치가 주요 불합리 항목으로 조사되었다.

• Transactions of the Korean Society of Machine Tool Engineers
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• v.10 no.5
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• pp.53-59
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• 2001

A screw driver is widely used in assembling machine parts or electronic products such as the printed circuit board with a housing. As the parts to be assembled becomes small and precise, the higher precision of the controlling screw driver torque is required. However, because the operator controls the fastening torque based on experience, it must be inexact and the setting procedure will be time consuming job. Thus the screw driver which can exactly control the fastening torque is developed utilizing a bellows in this paper. The bellows is expanded by the inner air pressure and contracted by the spring operation. The bellows type driver is composed of a clutch mechanism with two solenoid valves and a pressure sensor. Those valves are controlled using the detected bellows pressure by the sensor. When the pressure reaches the setting value, the exit solenoid valve is opened to release the air pressure from the bellows so as not to deliver further torque. Through a series of experiments, the performance is examined and verified.

• 전기의세계
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• v.43 no.11
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• pp.30-35
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• 1994

우리 학회는 국제화.개방화 추세에 부응하여 외국학회와의 협력을 증진코자 중국전기공정학회와 "학술.기술 교류협정"을 체결하였다. 창립 60주년을 맞은 중국전기공정학회로부터 대표단 파견 공식초청을 받아, 이동호 회장, 박상희 부회장, 진동신 사무국장 3인으 대표단이 지난 10월 20일부터 24일까지 5일간 중국북경을 방문하여 중국전기공정학회 창립 60주년 기념식, 국제회의, 국제전시회 등을 참관하고 이동호 회장은 중국 Zhang Feng Xiang 회장과 양국 학회의 긴밀한 교류증진을 위한 "학술 및 기술교류협정"을 정식 체결하는 성과를 거두고 귀국하였다. 여기에 우리 일행이 중국 북경을 다녀온 여행기를 간단히 소개하고자 한다.온 여행기를 간단히 소개하고자 한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.8
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• pp.378-385
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• 2017

This study investigated the design of a snap fit, which is widely used for fastening plastic parts. We analyzed the assembly mechanism of a lock snapfit, measured the assembly force and separation force based on the design of experiments, and derived a regression equation through an analysis of variance. The response surface methodology was also used. Polybutylene terephthalate was used to fabricate specimens, and the assembly force and separation force were measured using a micro-tensile tester. The length, width, thickness, and interference were considered as factors. A second-order regression model was used to derive the regression equation. The assembly force decreased with increasing length and width, but it increased with increasing thickness and interference. The finite element method was used to analyze the assembly mechanics. The width decreased the assembly force by increasing the ductility. The influences of the factors for low assembly force and high release force were shown to be opposite to each other. It was necessary to design a structure that minimized the assembly force while maintaining an appropriate level of separation force.

• KASI NEWSLETTER
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• s.48
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• pp.1-8
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• 2005

신년사/ 천문연 영문 명칭 변경/ 한국우주전파관측망(KVN) 기공식/ "04년도 실적평가 및 "05년도 선정평가 공개발표회/ 박상대 이사장 UST, 특별강좌/ 박상대 이사장, 기초연 차세대 연구기반동 기공식 축사/ 조직개편/ 2005 역서, 천문력 발행/ 2004년 동계 교원 천문 연수 실시/ 한-일 VLBI 연구협력을 위한 공동 모임/ 과학기술인공제회 회원 가입신청/ 직원동정/ 학회동정/ 콜로키움/ 일본의 적외선 우주망원경 ASTRO-F/ 2004 천문학.우주과학 및 관련기술에 대한 한일 공동강의/ 레몬산천문대 원격관측 시연회 및 현판식/ 새로 발견된 5개의 소행성에 한국의 과학기술자 이름 헌정/ FIMS이용, 세계최초 돛자리초신성 전체 영상관측/ 크리미아천문대와 공동연구 협정 체결/ 천문 계산용 고성능 PC 클러스터 구축/ 중앙전파관리소와 우주전파기술 교류에 관한 협약 체결/ 세종대학교와 망원경 운영 협정서 체결/ 일본 우주과학연구본부와 상호협약서 체결/ 연구원 창립 30주년 기념식 거행

• Korea Trade Review
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• v.41 no.5
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• pp.41-62
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• 2016

This study made an analysis of the effects of performance and learning orientation for the existing FTA on the intention to use a trilateral FTA among Korea, China and Japan. The results of the empirical analysis of Small and Medium-sized Enterprises(SMEs) located in Gwangju and Jeonnam provinces are as follows. First, there is a positive correlation between the effects of performance for the existing FTA and intention of a trilateral FTA. This result suggests that SMEs' performance feedback can be used as an asset of corporate experience and will be helpful to increase the intention to use a trilateral FTA by contributing to have sustainable competitive advantage of companies. Secondly, there is a positive correlation between the SMEs' learning orientation about FTA and intention to use a trilateral FTA. This result indicates that SMEs have more learning orientation for FTA. They actively acquire and diffuse information. These activities can be helpful for having prior knowledge and absorptive capacity. In conclusion, this study is considered to provide useful theoretical and practical implications that can contribute to enhancing the using intention of a trilateral FTA by explaining the significance of performance feedback and learning orientation.

• KOREAN POULTRY JOURNAL
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• v.43 no.11
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• pp.142-144
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• 2011