• KSTLE International Journal
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• v.7 no.2
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• pp.51-55
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• 2006

In order to design an effective foot surface which can provide adequate friction for a self-propelled medical microrobot moving inside the small intestine, frictional mechanisms between the small intestine inner wall and the foot surface of the robot must be understood. In this paper, mechanical interlocking effect was considered to design the surface of the foot that can generate the desired frictional force. The concept of the design was derived from the hookworm that lives inside the small intestine. Hookwarms are known to adhere to the small intestine wall by interlocking with villi on the surface of the small intestine. The interlocking mechanism was considered as the main frictional mechanism for the design of the microrobot foot surface in this work. 2 mm and 6 mm diameter solid and hollow cylindrical shaped foot specimens were designed and tested to assess the frictional force between the specimens and the porcine small intestine specimen.

• Proceedings of the Korean Society of Veterinary Clinics Conference
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• 2009.10a
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• pp.262-262
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• 2009

• Journal of Chest Surgery
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• v.28 no.1
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• pp.85-89
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• 1995

The early esophgeal carcinoma is limited to the mucosa or submucosa without lymph node metastsis which shows good 5-years survival rate. It is nearly 85-90% nowadays,if we just find and manage it.It is really helpful to use the endoscope in management and diagnosis, in addition the biopsy under the endoscopic finding.We experienced one case of early esophageal carcinoma. The patient was 57years old female,who ingested lye 27years ago for suicidal attempt, after 10years, the dysphagia was aggravated slowly. Before admission dysphagia was severely aggravated during 2months. Confirmation of diagnosis was made by endoscopic biopsy.Operation method was substernal colon bypass and total esophagectomy through right thoracotomy. Postoperative course was smooth.We report early esophgeal carcinoma related to lye stricture that was detected by the method of endoscopic examination and biopsy. It is important to screen the patients with longstanding history of benign esophageal stricture by the endoscopic biopsy.

• Journal of electromagnetic engineering and science
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• v.11 no.1
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• pp.51-55
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• 2011

Electromagnetic fields, radiated from an intestine-ingested source and propagated through an inhomogeneous human body model, are computed with the finite-difference time-domain (FDTD) method. The calculated results obtained at some receiving points vertically placed according to the abdomen of the human body model show unusual dip patterns in the frequency domain. The frequency of this unusual dip varies according to the location of the receiving points. Thus, the relationship between the frequency of the unusual dip and the incident angle of the line-of-sight is analyzed. The effect of the location of an ingested source on the above relationship is also investigated. The slope of the approximately linear relationship is affected by the location of the ingested source.

• Proceedings of the IEEK Conference
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• 2003.11c
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• pp.81-85
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• 2003

The Bi-directional Wireless Capsule endoscope con sists of CMOS Image sensor, FPGA, LED, Battery, DC to DC Converter, Transmitter, Receiver and Antennas. The RF transmitter at 1.2GHz range is designed and fabricated with 10 mm(diameter)x1.6 mm(thickness) dimension considering the maximum permission exposure(MPE), system size, power consumption, linearity and modulation method. The fabricated RF receiver at 400MHz range can demodulate the external signals so as to control the behavior of CMOS image sensor. four LEDs and Transmitter.

• Proceedings of the KIEE Conference
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• 1998.07g
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• pp.2228-2230
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• 1998

This paper presents the development of depth extraction algorithm for the stereoscopic endoscope data using a stereo matching method. generally, the purpose of existing stereo algorithms is to reconstruct stereo object surface and depth map. but the main purpose of our processing is to give exact depth feeling to doctor showing depth information in some points. for this purpose, this paper presents two stereo matching algorithms which are to measure exact depth. one is using variable window, and the other is reference points-based algorithm for a fast processing.

• Proceedings of the KSME Conference
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• 2001.06b
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• pp.271-276
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• 2001

Conventional clonoscope is semiflexible tube that should be manipulated by operator for inspection and treatment. Therefore, it sometimes causes pain for the patient and even perforation to the wall of colon if a surgeon is not well trained. For safe colonoscopy, self-propelling robots with inchworm locomotion are studied. But, inchworm locomotion has some problems in adaptiveness to the variation of colon diameter. In this paper, we propose novel locomotive mechanism which can move in the colon without any external assistance. It has several cams that have constant phase difference each other and located along the centerline of the mechanism. This mechanism could realize the robotic endoscope which has continuous and smooth thrust force.

• Proceedings of the KSME Conference
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• 2001.06b
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• pp.754-758
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• 2001

A new kind of piezoelectric actuation structure named double amplified multilayer actuator is proposed. Double amplified multilayer actuator combines both dimentional and flextensional amplification concepts. As a result the displacement of the actuator can be more than one hundred times larger than the displacement of multilayer actuator and can be used in in-pipe locomation robot such as an endoscope actuator. This paper studied the dependence of displacement on actuator parameters theoretically and experimentally.

• Korean Journal of Optics and Photonics
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• v.20 no.6
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• pp.311-318
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• 2009

We present an attractive real time in-vivo endoscopic microscope with a resolution of submicron, in which two kinds of optical correcting plates are inserted to eliminate higher order spherical aberration and field curvature. And, since the conventional objective lens is replaced to GRIN lenses with diameter of 1 mm, the above endoscopic microscope can be effectively utilized to invade minimally for live animals.

• Journal of Oral Medicine and Pain
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• v.41 no.2
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• pp.80-84
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• 2016

Non-odontogenic toothaches are frequently present and can be challenge to the dental clinician. A 41-year-old male patient with sharp and spontaneous pain on the right maxillary posterior dentition, which developed as like localized toothache 3 months ago, was finally treated with endoscope assisted sinus surgery on right maxillary sinus. Although the initial clinical characteristics are similar to odontogenic toothache in this patient, previous several treatment with the affected teeth did not alleviate the pain. Sinusitis around the facial structure is one of the common causes to make referred pain to maximally teeth and the sinus toothache resembles the pulpal or the periodontal toothache. The clinician should be well aware of various causes of the non-odontogenic toothache and be able to differentiate them.