• Resources Recycling
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• v.30 no.4
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• pp.3-10
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• 2021

The field of recycling for waste electronic components, which is the typical example of an urban mine, requires the development of useful sorting techniques. In this study, a sorter based on image identification by deep learning was developed to select electronic components into four groups. They were recovered from waste printed circuit boards and should be separated to depend on the difference after treatment. The sorter consists of a workstation with GPU, camera, belt conveyor, air compressor. A small piece (less than 3.5 cm) of electronic components on the belt conveyor (belt speed: 6 cm/s) was taken and learned as teaching data. The accuracy of the image identification was 96% as kinds and 99% as groups. The optimum condition of sorting was determined by evaluating accuracies of image identification and recovery rates by blowdown when changing the operating condition such as belt speed and blowdown time of compressed air. Under the optimum condition, the accuracy of image classification in groups was 98.7%. The sorting rate was more than 70%.

• Clean Technology
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• v.18 no.3
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• pp.287-294
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• 2012

In this study, performances of two cleaning methods were analyzed and a cleaning system was designed to develop a cleaning process of electronic components to remanufacture old laser copy machine. First, plasma cleaning as a dry cleaning method was executed to test cleaning ability. In cleaning of printed circuit board (PCB) by plasma, some damages were found near the metal parts, and considering the productivity, this method was not adequate for the cleaning of electronic components. With 4 different cleaning agents, ultrasonic cleaning tests were executed to select an optimal cleaning agent, aqueous agents showed superior cleaning performance compared to semi-aqueous and non-aqueous agents. Cleaning with aqueous cleaning agent A and 28 kHz ultrasonic frequency can be completed in 30 sec to 1 min. Finally, an ultrasonic cleaning system was constructed based on the pre-test results. Optimal cleaning conditions of 40 kHz and $50^{\circ}C$ were found in the field test. The productivity and economic efficiency in remanufacturing of laser copy machine are expected to increase by adapting developed ultrasonic cleaning system.

• Journal of the Institute of Convergence Signal Processing
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• v.16 no.3
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• pp.90-95
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• 2015

This study presents a method to test quite small-sized and light-weighted micro-drill bits which are used to make holes in printed circuit boards(PCB). After getting images of micro-drill bits through the high resolution microscope, we developed image processing algorithms to detect fiducial points, and then measured diverse factors of the drill-bit based on these points. We also developed the window-based inspection system to automatically discriminate normal and abnormal status. For the relative comparison of its performance, the system was compared with an existing inspection system using test images. Experimental results showed that the proposed system slightly improved performance, and also classified correctly some misjudged errors which were occurred in the existing system.

• Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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• 2001.11a
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• pp.128-128
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• 2001

제지기술의 변화속도가 빨라지고 제품의 고품질화가 요구가 많아지면서 finishing 공정 에 대한 관심과 중요성이 점점 더 높아지고 있다. 소비자의 요구에 부합되는 제품의 품 질을 얻기 위해서 여러 가지 방법들이 개발되고 있으며, 그 중에서 calender 설비 및 처리 기술이 계속적으로 발전하고 있는 추세이다. 특히 coated paper 제조 공정에서의 s supercalender 처 리 기 술은 매 우 중요하다. F Finishing 공정은 종이의 품질을 결정하는 제지 공정의 마지막 단계로서 calendering 처리 방법에 따라 제품의 품질을 크게 변화시킬 수 있다. 따라서 본 연구에서는 기존의 s supercalendering 처리 조건을 변경시켜 도공지의 품질 특성을 관찰하였으며 실험실용 s supercalender와 현장 적용을 통하여 supercalender 처리 조건이 도공지 품질에 미치는 영향에 대하여 검토하고 이를 이용하여 제품 품질을 개선시키기 위해서 수행하였다. 안료 배합비를 달리하여 다양한 온도와 압력 조건을 적용하여 보았으며 동일한 백지광 택을 갖는 여러 조건들에 대해서 각각의 품질 특성을 살펴보았다. 동일 백지광택에서 온도가 높을수록 macro-roughness, micro-roughness는 더 우수하게 나타났으며 이는 printability의 차이로 이어 졌다. 실험실용 supercalender를 이용한 실험에서 경도가 다른 두 가지 탄성롤로 cotton roll 과 polymer roll을 사용하였으며 통일한 온도와 압력 조건에서 calendering 특성은 서 로 다르게 나타났다. Calendering 조건이 가혹할수록 두 roll간의 특성은 더욱 두드러지 게 나타났으며 macro-roughness 보다는 micro-roughness에서 차이가 더 큰 것으로 확인되었다. 이러한 두 roll간의 특성 차이로 인하여 실제 인쇄 결과는 다르게 나타날 것으로 예상된다.

• Journal of Institute of Control, Robotics and Systems
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• v.2 no.4
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• pp.337-343
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• 1996

In this paper, we investigate the defect detection by making use of pre-made reference image data and classify the defects by using the artificial neural network. The approach is composed of three main parts. The first step consists of a proper generation of two reference image data by using a low level morphological technique. The second step proceeds by performing three times logical bit operations between two ready-made reference images and just captured image to be tested. This results in defects image only. In the third step, by extracting four features from each detected defect, followed by assigning them into the input nodes of an already trained artificial neural network we can obtain a defect class corresponding to the features. All of the image data are formed in a bit level for the reduction of data size as well as time saving. Experimental results show that proposed algorithms are found to be effective for flexible defect detection, robust classification, and high speed process by adopting a simple logic operation.

• The monthly packaging world
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• s.230
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• pp.92-99
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• 2012

KOREA STAR AWARDS는 패키징 $\triangle$완제품 $\triangle$재료(플라스틱, 종이 판지, 금속, 유리, 목재, 복합소재) $\triangle$친환경 $\triangle$기계(설비) 및 관련 부품 $\triangle$ 인쇄(라벨링) $\triangle$부자재 $\triangle$생산 및 가공공정 $\triangle$패키징 디자인 등의 분야에서 신기술 개발과 지속가능성을 통해 패키징 산업 발전에 기여한 기업, 그리고 패키징 관련 정책연구, 기술개발, 패키징산업 육성에 기여한 개인에게 시상. 2012 KOREA STAR AWARDS는 코리아스타상(기업, 학생, 공로부문)으로 지식경제부장관상(상장4점, 표창2점), 한국생산기술연구원장상(상장 12점, 표창1점), 한국포장기술사회장상(상장 20점) 총 39점 시상. 코리아스타상 기업부문 지식경제부장관상은 '에이스기계 종이상자 자동접착기의 패스트 폴딩 장치', 'LG생활건강 이자녹스 SMART 진동시리즈', '삼성전자 냉장고 친환경 재사용 포장', '한국에이버리 친환경 수분리성 점착라벨' 4개 제품 수상. 코리아스타상 공로부문 지식경제부장관표창은 (주)경연전람 김영수 대표와 김수일포장개발연구소 김수일 소장 수여. 본 고에서는 "2011 미래패키징 신기술 정부포상" 수상작들의 패키징 동향 및 유공자들의 공적 내용을 살펴보도록 한다.

• Journal of Biomedical Engineering Research
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• v.32 no.1
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• pp.32-36
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• 2011

The insufflators in endoscopic surgery supply carbon dioxide to make the air-filled cavity in the abdomen. It contains many kinds of pneumatic and electronic parts and they are connected with the air tubes and electrical wires. The printed circuit boards (PCB) perform wiring, holding and cooling tasks in electronic systems. In this study, the PCB is used as the air channel for insufflators to decrease the cost, volume, and the malfunction according to aging of the device. Three layers of PCB made of FR4 are combined with prepreg as adhesive which has the internal airway channel according to the design. By mounting the pressure sensors and valves, the PCB based fluidic system is implemented. After calibration of flow sensor, the flow rate of the gas also can be measured. The climate test, temperature test, and biocompatibility test showed this idea can be used in insufflators for laparoscopic surgery.

• Journal of Korean Library and Information Science Society
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• v.32 no.4
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• pp.45-75
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• 2001

University library is more than just a collection. In other words, it is an access point and gateway to a world-wide information. Therefore, the evaluation of hybrid library and information services should be recognized an essential management activity. The goal of this study is to develope a new evaluation model for Korean university libraries, based on the analysis of existing models and perception level of the shakeholder groups. As result of statistical analysis, the study suggested six evaluation domains, thirty-seven indicators, and the relative importance (weight) and measure criterion.

• Journal of the Korea Society of Computer and Information
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• v.4 no.2
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• pp.80-87
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• 1999

We propose the various Telemedicine applications using collaborative PACS environment. Traditionally, almost all medical images have been printed on radiological films. These films are expensive to produce and easy to misplace and usually only one copy exists, thus limiting the number of persons who have simultaneous access to the images. But the merit of this system including PACS(Picture Archiving and Communications System ) is very many which are small depository, low maintenance expense, good efficience(storage, speed) and good flexibility but the development costs is higher. This research has been done creating multimedia-based Telemedicine system for home PCs in network environment. Most of Telemedicine used hardware and exclusive line of high cost as CATV broadcasting technique. But this system will contribute to change the Home-PC for better use of collaborations among doctor and patients through various modes of interactions in cyberspace.

• Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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• 2001.04a
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• pp.78-78
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• 2001

현재 Lab Coating은 실험의 정확성 및 재현성을 위해 기존의 Hand Coating에서 탈피하여 Mayor Coater나 CLC(Cylindrical Laboratory Coated) 등을 사용하여 주로 진행된다. Lab Coater로는 현재 가장 진보된 장비라고 할 수 있는 CLC의 경우 속도와 metering 방식 등에서 현장과 유사한 조건을 재현할 수 있다. 그러나 CLC를 사용하여 Multi Layer C Coating을 실시할 경우 원하는 도공량을 얻기 위해서는 상당한 시간과 노력이 필요하며 특히 Triple Coating의 경 우는 더 힘 든 과정 을 거 쳐 야 한다. 그래서 본 연구에서는 도공량 변화 및 Color Formulation 변경에 의한 물성변화를 측정 하여 Triple Coating에서 두 인자가 각각의 품질에 미치는 영향을 비교 분석하여 어느 정도 도공량 변화가 Color Formulation 변화에 상응하는 영향을 주는지를 파악하고자 하였다.코팅은 CLC 6000을 이용하여 실시하였으며, rod와 blade를 사용한 Triple coating을 5가 지 경우의 Color Formulation에 대하여 실시하였다. 변화시켜 코팅한 후 도공량에 따른 백지물성 관계를 분석한 결과 백색도, 평활도, 거칠음도, 투 기도,2도 trap, Set-Off, Dr${\gamma}$ pick은 총도공량과 강한 상관관계를 보였고, 광택도와 K&N은 총도공량보다는 Top 코팅량과 강한 상관 관계를 보였다. 동일한 코팅칼라를 이용하여 인쇄물성을 고찰하였다. 도공량과 물성의 그러나 동일한 코팅칼라를 사용하여 얻어진 일련의 상관성은 Color Formulation이 변경 되었을 경우 전혀 발견할 수 없었다. 즉 Triple Coating에서 코팅칼라 변경이 품질에 미치는 영향은 도공량 변화에 비해 절대적이어서 몇십%의 현을 억제하지는 못한다는 결론을 도출할 수 있었다.