• Journal of Satellite, Information and Communications
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• v.9 no.1
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• pp.17-21
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• 2014

In this paper, we proceeded a study about the wireless endoscopic technology development combined with UWB communication module for endoscope. Firstly, we proposed needs of UWB wireless endoscope technology development related to domestic endoscope industry and UWB communication technology. Also, we develop a wireless endoscope combined with UWB communication module. In this paper, the proposed UWB wireless endoscope technology can acquire a endoscope image using UWB communication method. It can transfer a image at high data rate using DB and Smart Device linkage technology, an effective and trusted diagnosis is possible. The proposed UWB wireless communication module combined with UWB communication module is expected to be widely utilized.

• Information and Communications Magazine
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• v.25 no.2
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• pp.41-46
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• 2008

무선 캡슐형 내시경 시스템 설계를 위하여 인체내부에서 표면까지의 전송손실을 $0.001{\sim}2$ GHz대역에 대하여 분석하였다. 실제 인체구조 모델에 안테나를 적용하여 계산결과를 얻은 기존 연구와 달리 인체내 매질의 평균적 특성을 갖는 균일 매질로 가정하여 안테나의 Q와 효율을 계산하였다. 계산 결과 40MHz의 HPBW(Half-Power Bandwidth), 5mm반경 크기의 송신안테나, 15un거리에 대하여 $400{\sim}600$MHz 사이에서 -58dB가량의 최적 손실이 예상되었다. 분석된 손실 결과를 바탕으로 450MHz에서 무선 캡슐형 내시경 시스템이 설계 및 제작되었고 실제 유사매질용액에서 실험결과 15cm/10cm거리에서 -62/-5ldB의 손실을 보였으며 동물실험에서는 돼지 체내외간 10cm가량의 거리에 대해 약 -56dB의 손실이 측정되었다.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.343-344
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• 2007

소화기관의 질병 진단 및 질료의 목적으로 사용되어지는 기존의 일반적인 내시경은 의사의 숙련도를 요하고 환자에게 고통 및 공포감을 수반한다. 이러한 문제점을 해결하기 위하여 캡슐형 내시경이 사용되고 있지만 소화기관의 연동운동에 의존한 내시경의 이동으로 인하여 시술 시간이 길고 지나온 기관에 대한 재검사가 불가능 하다는 단점을 가지고 있다. 이에 대한 대안으로 체내 능동구동이 가능한 캡슐형 내시경의 개발이 활발히 진행되어지고 있다. 본 논문은 소형 직류 전동기를 이용한 체내 능동 구동 메커니즘을 제안하고 캡슐 내시경 로봇을 무선 구동하기 위한 직류 전동기 구동 장치 및 무선 데이터 송수신 모듈, 집적된 시스템의 배터리 구동 기술을 제안한다. 개발된 마이크로 로봇은 In-vitro 실험을 통하여 체내 능동 구동가능성을 검증 하였다.

• Journal of Internet Computing and Services
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• v.16 no.1
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• pp.1-8
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• 2015

Ultra-wide-angle wireless endoscopes are demonstrated in this paper. The endoscope is composed of an ultra-wide-angle camera module and wireless transmission module. A lens unit with the ultra-wide FOV of 162 degrees is designed and manufactured. The lens, image sensor, and camera processor unit are packaged together in a $3{\times}3{\times}9-cm3$ case. The wireless transmission modules are implemented based on UWB- and WiFi-based platform, respectively. The UWB-based module can transmit HD video to a computer in resolution of $2048{\times}1536$ (QXGA) and the frame rate of 15 fps in MJPEG compression mode. The maximum data transfer rate reaches 41.2 Mbps. The FOV and the resolution of the endoscope is comparable to a medical-grade endoscope. The FOV and resolution is ~3X and 16X higher than that of a commercial high-performance WiFi endoscope, respectively. The WiFi-based module streams out video to a smart device with th maximum date transfer rate of 1.5 Mbps at the resolution of $640{\times}480$ (VGA) and the frame rate of 30 fps in MJPEG compression mode. The implemented components show the feasibility of cheap medical-grade wireless electronic endoscopes, which can be effectively used in u-healthcare, emergency treatment, home-healthcare, remote diagnosis, etc.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.45 no.3
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• pp.80-85
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• 2008

Capsule endoscopes generally use primary cells as a power source due to its limited space. However, the primary cells have several limitations such as high cost, limited power and no reuse. To solve these problems, a new wireless energy transmission method is proposed. The proposed approach uses air-gap transformer concepts and LC resonance to transmit energy from transmitter(primary side) to capsule endoscopes(secondary side). The ferrite core with 3-axis winding is used to increase energy transfer efficiency regardless of direction and location. The experimental results show that the proposed method stably supplies 30mW power to secondary circuit.

• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.7
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• pp.275-280
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• 2013

This paper presents an optimizing method for wireless charging system, specifically focused on the capsule endoscope applications. In order to increase the wireless power transfer efficiency of electro-magnetic resonance coupled coils, this paper investigates the impact factors of the power transfer efficiency in small battery capacity system and proposes a efficiency optimizing method based on frequency control. Simulation results show that the proposed efficiency optimal control method can effectively stabilize the wireless power transfer efficiency so as to successfully solve the main issue of transfer efficiency variation with distance and as well as parasitic element.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38C no.9
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• pp.802-812
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• 2013

Recently, Capsule Endoscope(CE) system is receiving great attention as a innovative convergence technology that allows doctors to examine the digestive tract of a human body in the minimum invasive way. Once patients swallow the vitamin pill-sized capsule, doctors can detect disease such as blood-based abnormalities, polyps, ulcers, and Crohn's disease through the image information delivered by wireless or human body communication module in CE. Although CE is really a innovative technology, it still suffers from some drawbacks in terms of correct diagnosis of lesion and analysis required time. Due to the massive images approximately 60~120 thousand frames taken by miniature camera in the CE, doctors spend too much time examining the images and analyzing the lesions. Therefore, to lighten the burden of doctors, software tools for fast diagnosis and medical image processing techniques for correct diagnosis of lesion are essential in CE system. In this paper, we investigate the latest trends of diagnosis tools and image processing techniques based on major makers of CE systems, which are hardly known to the general public.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37 no.4C
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• pp.329-337
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• 2012

Capsule Endoscope(CE) is a capsule-shaped electronic device which can examine the lesions in digestive tract of human body. Recently the medical procedure using capsule endoscope is receiving great attention to both doctors and patients, since the conventional push-typed endoscope using cables brings great pain and fear to the patients. The technique was firstly available in 2000 and is based on a convergence techniques among BT(Bio Technology), IT(Information Technology), and NT(Nano Technology). The device consists of an optical parts including LEDs(Light Emitting Diodes), an image sensor, a communication module and a power module. Capsule endoscope is the embodiment of the state-of-the art technology and requires key technologies in the various engineering fields. Therefore, in this paper, we introduce the composition of the capsule endoscope system, and compare the communication method between RF(Radio Frequency) communication and HBC(Human Body Communication), which are typically used for data transmission in the capsule endoscope. Furthermore, we analyze the specification of commercialized capsule endoscopes and present the future developments and technical challenges.

• Journal of Convergence Society for SMB
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• v.4 no.1
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• pp.17-29
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• 2014

The wireless capsule endoscopy played an important role as the evolutionary medical device to solving the difficulties such as diagnosing the intestine diseases. Due to the limited size and functions, it has some drawbacks. The most obstacle thing is the disability of self-motion, it means that it cannot provide the speed problem. Hence, the characteristics of human digestion system is briefly introduced, especially the intestine, to get the information of endoscopy dynamics. Next, in order to make an abstraction of the condition, a new dynamic friction model called LuGre model is introduced and clearly analysed to get the characteristics and the usage of the model. By the consideration of parameters that are tightly related with the real situation of the capsule endoscopy. The Matlab Simulink was applied to build the model and verified by the simulation to discover the features.

• Journal of Biomedical Engineering Research
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• v.25 no.6
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• pp.447-453
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• 2004

In the case of a capsule that can acquire and transmit images from the intestines, the size of the module and the battery capacity in the capsule are subject to restriction. The capsule must be swallowable and the battery must maintain the stable power during the capsule travels in the gastrointestinal tract. Therefore, it is important to control the endoscope using bi-directional wireless communication. In this study, encoder and decoder CPLD modules for bi-directional capsule endoscopes were designed and implemented. The designed controller for capsule endoscope can transmit the images of GI-track from inside to outside of the body and the capsules can be controlled by external controller simultaneously. The designed and implemented controller was verified by an in-vivo animal experiments. From these experiments, it was verified that the CPLD module for bi-directional capsule endoscope satisfied the design specifications.