• Proceedings of the KIEE Conference
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• 2006.10c
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• pp.333-335
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• 2006

This paper presents a force-reflecting teleoperation scheme with time delay. In reciprocal systems, to improve the stability and performance of the tleleoperation system, the network provides a wide bandwidth, no congestion. However, as use of Internet increases, congestion situation of network increased and transmission time and packet loss increased accordingly. This can make system unstable at remote control. In this paper, we present a passive control scheme for a force reflecting bilateral teleoperation system via the Internet and we investigated how a varying time delay affects the stability of a teleoperation system. A new approach based on a passive control scheme was designed for the system. The simulation results and the tracking performance of the implemented system are presented in this paper.

• Journal of Veterinary Clinics
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• v.26 no.1
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• pp.86-90
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• 2009

An intact female, 5-year old, Shihtzu, weighing 3.2 kg with a history of depression, hypersalivation, dullness, and ataxia for 3 days was referred. Radiographic findings included microhepatica, bilateral renal calculi, and a cystic calculus. Ultrasonography showed microhepatica, decreased visibility of portal veins in the liver, bilateral renal calculi, a cystic calculus, and an abnormal tortuous dilated vessel in the craniodorsal abdomen. A single congenital extrahepatic portoazygous shunt was confirmed through operative mesenteric portography. The patient received surgery using an ameroid constrictor ring and recovered well.

• Proceedings of the KIEE Conference
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• 1989.07a
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• pp.587-590
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• 1989

Bilateral Variable-Ratio chopper system performs Step-down chopper and Step-up chopper operations automatically every operating period of the chopper. The Ratio between Step-down chopper and Step-up chopper operations is determined by a Tine- ratio and the circuit elements. In this paper, we suggest that this chopper system can operate variable speed control of the electric motorcar when it is applied to the electric motorcar.

• Archives of Craniofacial Surgery
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• v.19 no.2
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• pp.131-134
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• 2018

Treacher Collins syndrome is a congenital disorder that is characterized with a wide range of cranio-facial deformities. Zygomatic hypoplasia or aplasia is one of the key features, and surgical reconstruction of the consequent depression on the zygomatic area is deemed necessary by many patients. Various surgical options are available-injectables, alloplastic materials, autologous grafting, and autogenous tissue transfer. It depends on each patient which technique to use. Here, we present a clinical case, in which bilateral free groin flaps were adopted in attempt to resolve the remnant aesthetic deformity associated with zygomatic depression, despite a series of previous surgical efforts, in a 25-year-old Treacher Collins syndrome male patient.

• 제어로봇시스템학회:학술대회논문집
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• 2001.10a
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• pp.51.1-51
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• 2001

Teleoperation is a rapidly progressing field promising to have significant application in space, mining, medical, and other areas. Unfortunately, significant communication delays are expected in teleoperation. With this problem, the two major issues in teleoperation are stability robustness and transparency performance. Recent work in bilateral teleoperation in the two-channel showed that for any two-channel control architecture, stability robustness is enhanced if the feedforward control parameters are lowered. In this paper, we analyze the stability and performance robustness of the three channels control architectures using the passivity-based Llewellyn´s absolute stability criterion as wall as the minimum values and Z-width´s of the operator and environment transmitted impedances. And the stability and the performance robustness of two and three channels control architectures are quantitatively compared.

• Investigative Magnetic Resonance Imaging
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• v.21 no.4
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• pp.264-268
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• 2017

South Korea has the highest reported suicide rate among all countries belonging to the Organization for Economic Cooperation and Development. Nitrogen is a colorless, odorless and nontoxic gas. Nitrogen gas has, however, been recently used as a method of attempted suicide, its nontoxity notwithstanding. We herein report on an unusual case involving a 30-year-old male who presented with symptoms after a suicide attempt by nitrogen inhalation. Diffusion-weighted imaging of his brain was showed curvilinear high signal intensity in the bilateral frontal and right occipital cortices, with subtle low apparent diffusion coefficient value. In addition, T2-weighted images and fluid attenuated inversion recovery images revealed subtle high signal intensity in the bilateral frontal cortices, basal ganglia and occipital cortices with contrast enhancement.

• Clinical and Experimental Pediatrics
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• v.51 no.9
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• pp.1018-1022
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• 2008

Testicular adrenal rest tumors are a well-known complication in male patients with congenital adrenal hyperplasia. Corticosteroid suppressive therapy usually results in the regression of these tumors. We describe a patient with 21-hydroxylase deficiency who developed bilateral testicular masses. Despite steroid suppressive therapy, the tumors did not regress and hormonal control was poor. Consequently, bilateral partial orchiectomies were performed.

• Journal of Yeungnam Medical Science
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• v.10 no.2
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• pp.544-549
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• 1993

The authors have experienced a case of organic mental disorder with bilateral frontal lobe atrophy in a 36-year-old man. He showed negative symptoms of schizophrenia such as anhedonia, social withdrawal, flat affect, poverty of thought.

• Archives of Plastic Surgery
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• v.43 no.5
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• pp.457-460
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• 2016

Autologous breast reconstruction utilizing a perforator flap is an increasingly popular method for reducing donor site morbidity and implant-related complications. However, aberrant anatomy not readily visible on computed tomography angiography is a rare albeit real risk when undergoing perforator flap reconstruction. We present an operative case of a patient who successfully underwent a bilateral breast reconstruction sourced from a unilateral abdominal flap divided into deep superior epigastric artery and superficial circumflex iliac artery flap segments.

• Journal of Chest Surgery
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• v.37 no.10
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• pp.880-883
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• 2004

The graft infection within the abdomen is a notorious condition, which usually develops serious complications of anastomotic rupture or distal embolism that ended in death. There has been many controversies in the treatment of an aortobiiliac graft infection and varying results have been reported. The authors treated a case of aortobiiliac graft infection after abdominal aortic aneurysm surgery. The operation was performed with re-aortobiiliac bypass using bilateral superficial femoral veins. The result was successful.