• Vending industry
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• v.4 no.3 s.11
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• pp.52-54
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• 2004

100원, 500원 동전을 가장 요긴하게 활용할 수 있는 유통수단은 자판기이다. 자판기를 통해 제공되는 커피, 캔음료의 가격대가 1000원 이하이다 보니 동전사용이 엄청나게 많이 이루어진다. 이렇게 소액결제의 대명사인 자판기가 동전사용의 비중이 높다 보니 이로 인해 파생되는 문제 역시 다양하다. 항시 자판기내 동전보관이 되어 있는 만큼 도난 파손의 문제가 작용하기도 하고, 화폐가치 차이가 있는 제3국 동전을 넣는다거나, 이물질을 넣는 문제가 발생하기도 한다. 또 애써 모은 동전을 은행이 교환해 주지 않아 골머리를 앓기도 한다. 한쪽에서는 무시를 받고, 또 한쪽에서는 한탕의 수단으로 혈안이 되게 만드는 게 자판기 동전이다. 인간사 다양한 이치처럼 자판기 동전으로 인해 파생되는 문제도 다양하다. 이번 정책초점에서는 자판기 동전 문제를 보는 두 가지 시각을 조명하고자 한다. 필리핀 동전 1페소가 국내 자판기에 유통되는 문제와 은행들의 교환거부로 애물단지로 전락한 자판기 동전 문제를 분석 정리했다.

• Journal of the Korean Data and Information Science Society
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• v.21 no.1
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• pp.147-153
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• 2010

It is generally believed that teaching probability with the help of coin tossing has a long history. In textbooks about elementary probability or statistics, problems on unfair coins as well as fair ones are frequently given. However it is known that nobody has met an unfair coin with a fixed head probability which is different from 0.5 in flesh and blood. In this study a coin bent along with the middle line of the coin is suggested as an unfair one. By flipping bent coins with various angle, the ratios of head of the coins are obtained. The bent coins might be used as experimental tools for teaching of probability concept.

• Proceedings of the Korean Society of Computer Information Conference
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• 2013.07a
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• pp.225-226
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• 2013

본 논문에서는 스마트폰을 이용한 잔돈 관리 시스템에 대해 제안한다. 현재 동전의 실거래양도 적을뿐더러 사람들의 경우에는 동전이 생겼을 경우 동전을 주머니에 넣고 다니는 불편을 겪고 있다. 이에 스마트폰을 이용하여 잔돈을 직접 받는 것이 아니라 이를 어플을 통해 마일리지 형태로 적립하여 추후에 자신의 계좌로 저금한 금액을 출금할 수 있으며 저금한 금액의 일부를 자동 기부함으로 아름다운 사회 만들기의 일환에 도움이 된다. 이는 동전휴대의 불편함을 개선 가능하고 함부로 사용가능한 동전사용을 막아 저축의 기능도 있으며 동전이 유통되지 않아 계속 더 큰 돈을 들여 만드는 한국은행의 돈을 줄일 수 있을 것으로 예상된다.

• Vending industry
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• v.7 no.3 s.21
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• pp.38-39
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• 2007

새 10원 동전이 나온 지 1년여가 되었는데 제대로 된 돈 구실을 못하고 있다. 유통량도 워낙 적은데다 동전크기도 너무 작기 때문에 소비자의 선호도 역시 떨어지기 때문이다. 게다가 자동판매기나 공중전화에서도 사용할 수 없으니 무용지물이라는 얘기까지 나온다. 매스컴에서는 연이어 이 문제를 보도하며 여론화를 하고 있다. 보도의 핵심은 10원 동전이 제구실을 못한다는 부분에 맞추어져 있지만 은근히 새 10원 동전 인식에 무관심한 자동판매기 분야까지 비판의 대상으로 삼고 있다.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2006.04a
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• pp.128-130
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• 2006

충남 청양군에 위치한 삼광광산의 광미장에서 채취한 것을 사용하여 펄스전원을 이용한 동전기실험 결과 실험경과시간 약 200시간 안에 약 50%의 제거효율을 보여 직류전원을 이용한 동전기 실험보다 빠른 제거속도를 보였다. 또한 직류전원을 이용한 동전기 실험과 펄스전원을 이용한 동전기 실험의 시간당 투입된 전력량을 비교해 보면 각각 5.97W와 1.94W으로 이는 직류전원의 약 30%수준이어서 에너지 절약효과를 기대할 수 있다.

• Journal of the Korean Institute of Intelligent Systems
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• v.22 no.1
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• pp.7-11
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• 2012

This paper develops the coin recognition and classification system using digital image processing technique. Coin images are taken by USB camera. The developed system can be used at home since it just needs USB camera and personal computers. For this development, some digital image prodessing technique is used; size recognition technique and color classification. Using Matlab, we design the graphic user interface and verify the reliability of the developed system with some simulation result.

• KIISE Transactions on Computing Practices
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• v.21 no.6
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• pp.424-429
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• 2015

This research proposes a new system for calculating the total amount of coins in an image. The proposed system identified and classified the coins in the image in realtime. The image was obtained using a USB camera. Most previous coin calculation systems only used size information. If the size of an object was incorrectly detected, it caused a misclassification. Especially, in case of the former 10 won, it had high error rate because it was similar in size to the 50 won and 100 won coin. The proposed system combines hue histogram information with size information to reduce errors in the classification process. When we only used size information in the classification experiment of 2,290 coins, the recognition rate was on average about 88.2%. When we combined hue information with size information the recognition rate increased to about 99.3%.

• Journal of Platform Technology
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• v.9 no.3
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• pp.63-69
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• 2021

Limited materials to make coins for countries and designs suitable for hand-carry make the shape, size, and color of coins similar. This similarity makes that it is difficult for visitors to identify each country's coins. To solve this problem, we propose the coin classification method using CNN effective to image processing. In our coin identification method, we collect the training data by using web crawling and use OpenCV for preprocessing. After preprocessing, we extract features from an image by using three CNN layers and classify coins by using two fully connected network layers. To show that our model designed in this paper is effective for coin classification, we evaluate our model using eight different coin types. From our experimental results, the accuracy for coin classification is about 99.5%.

• Journal of the Korean Geotechnical Society
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• v.19 no.3
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• pp.83-91
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• 2003

The electrokinetic technique has been applied to remove mainly the heavy metal and the ultrasonic technique to remove mainly organic substance in contaminated soil. In this study, the combined electrokinetic and ultrasonic remediation technique was studied far the removal of heavy metal and organic substance in contaminated soils. This study emphasized the coupled effects of electrokinetic and ultrasonic techniques on migration as well as remediation of contaminants in soils. The laboratory soil flushing tests combining electrokinetic and ultrasonic technique were conducted using specially designed and fabricated devices to determine the effect of both of these techniques. A series of laboratory experiments involving the simple, electrokinetic, ultrasonic, and electrokinetic & ultrasonic flushing test were carried out. A soil admixed with sand and kaolin was used as a test specimen, and Pb and ethylene glycol were used as contaminants of heavy metal and organic substance. An increase in out flow, permeability and contaminant removal rate was observed in electrokinetic and ultrasonic flushing tests. Some practical implications of these results are discussed in terms of technical feasibility of in situ implementation of electrokinetic ultrasonic remediation technique.

• Journal of the Korean Geotechnical Society
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• v.22 no.9
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• pp.5-14
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• 2006

Generally, the sediments contain significant water, clay, colloidal fraction and contaminants, and can result in soft strata with high initial void, and its potential hazards in subsurface environments exist. Electrokinetic technique has been used in sedimentation for volume reduction of slurry tailing wastes and in remediation for extraction of contaminants from contaminated soils. In this research, the coupled effects of sedimentation and remediation of contaminated sediments are focused using electrokinetic sedimentation and remediation techniques from experimental aspects. A series of laboratory experiments including variable conditions such as initial solid content of the specimen, concentration level of the contaminant, and magnitude of applied voltage are performed with the contaminated sediment specimens mixed with ethylene glycol. Commercially available high specification Kaolin was used to simulate slurried sediment. From the test results, the settlement of specimen increases with increasing of applied voltage and decreasing of solid content and contamination level. The density of specimen increases due to settlement of specimen in the process of electrokinetic sedimentation and decreases due to extraction of organic contaminant in the process of electrokinetic remediation.