• Journal of the Korea Convergence Society
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• v.11 no.10
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• pp.25-30
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• 2020

In this study, a test system which can test performance of curling pad was developed to support Korea curling team. The developed system consists of a water tank, a mechanical pad driving system that can perform sweeping movement using a curling pad on surface of ice made by the water tank, and temperature sensors monitoring ice and air temperatures. To control the temperature of ice and humidity/temperature of air around the ice, all system are installed in a chamber that can isolate the developed system from external environment. Eight kinds of curling pads were tested using the developed system. Test result showed that each curling pad revealed different rate of ice temperature increasing. The pad with the highest rate of ice temperature rising was found to be the same as the most preferred pad by the athletes. Therefore, it was confirmed that the method of measuring change of ice temperature by the sweeping performed in this study is an effective method to test the performance of the pad.

• Journal of the Korea Convergence Society
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• v.8 no.11
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• pp.49-56
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• 2017

Curling sweeping is one of important motion to control the position of the curling stone, and sweeping speed and applied force to the broom pad are major research subjects. In this study, a device was developed to measure the force applied to the curling broom pad in curling sweeping motion, and two load cells were mounted between the broom pad and pad holder. Analog signals generated from the load cells were sampled about 300 times per second using a micro controller, and then converted to 10-bit digital signals. Calibration of the load cell and set up of regression equations to convert the measured electrical signals into mass (force) was done by three M1 class weights, and the developed system was designed as wearable device to minimize increasing of total weight of the broom. Same force was applied to the developed system and a force plate that was using as a reference force measurement system in field of sports, and the difference between the measured values were showed about $0.909{\pm}1.375N$(mean and standard deviation). The developed system could be applied other kinds of study which required force measurement function similar to sweeping motion.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2022.11a
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• pp.214-217
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• 2022

2018 년 평창 동계올림픽부터 우리나라 사람들이 컬링이라는 종목에 큰 관심을 갖기 시작하였다. 하지만 이 종목을 직접 체험하거나 경기를 보기 위해서는 빙판이 있어야 하는 특수성과 비싼 장비, 찾아보기 힘든 경기장 등 여러 열악한 조건들 때문에 결국 올림픽 시즌에만 반짝 관심을 가졌다가 시들어버렸다. 이를 해결하기 위해서 우리는 Unity 라는 게임 엔진을 사용하여 사람들이 쉽게 접할 수 있는 컬링 게임을 제작하였다. 실제 컬링을 게임으로 만들기 위해 컬링에 필요한 도구들을 이미지로 제작하여 Unity 내부에서 저장 후 오브젝트에 입력하였고 물리 법칙을 구현하기 위해 Unity 상에서 방향, 세기, 속도, 충돌들을 프로그래밍하였으며 대한컬링연맹에 나와있는 컬링 경기 규칙서를 활용하여 게임에 적용하였다. 또한 컬링의 진행이 현실적인 운동과 비슷하게 하기 위하여 스크립트 안의 충돌 및 마찰 관련 계수를 조절하였고 이를 이용하여 반복한 결과값들을 수치화 하여 그래프로 작성해보았다. 추가적으로 컬링 게임의 점수판과 카메라 시점 등을 통해서 게임 사용자가 게임 진행에 있어서 도움이 되는 부분을 구현하였고 현실성을 위하여 Arduino 를 이용한 게임 패드를 제작하여 직접 게임하는 듯한 느낌을 들도록 하였다. 최종적으로 게임을 이용하여 컬링에 대한 이해도가 증가하고 사람들이 컬링이라는 비인기 종목에 한 걸음 더 접근할 수 있게 되고, 스포츠발전에 조금이나마 기여할 수 있게 될 것이다.

• Journal of Ocean Engineering and Technology
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• v.8 no.1
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• pp.131-143
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• 1994

The BTA(boring and trepanning association) deep hole machining has an increasing demands because of its wide applications and its good productivity. The main feature of the BTA tools is that the tool cutting edges are unsymmetrically located on the boring head. This provides a stabilizing cutting force resultant necessary for self guidance of the boring head. The BTA tools are capable of machining for having a large length to diameter ratio in single pass. A study of the accuracy and surface finish of holes produced would reveal quite useful information regarding the process. This study deals with the experimental results obtained during BTA machining on SM55C, SM45C steel under differnt machining conditions.