• Journal of the Institute of Electronics Engineers of Korea SC
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• v.39 no.2
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• pp.140-145
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• 2002

A new CMOS buffer removing short-circuit power consumption is proposed. The gate-driving signal of the pull-up(pull-down) transistor at the output is controlled by delayed internal signal to get tri-state output momentarily by shunting off the path of the short-circuit current. The SPICE simulation results verified the operation of the proposed buffer and showed the enhancement of the power-delay product at 3.3V supply voltage about 42% comparing to the conventional tapered CMOS buffer(1).

• Journal of Mechanical Science and Technology
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• v.17 no.11
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• pp.1650-1658
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• 2003

This paper deals with a novel shunt circuit, which is capable of suppressing multimode vibration amplitudes by using a pair of piezoceramic patches. In order to describe the characteristic behaviors of a piezoelectric damper connected with a series and a parallel resistor-negative capacitor branch circuit, the stiffness ratio and loss factor with respect to the non-dimensional frequency are considered. The mechanism of the shunt damper is also described by considering a shunt voltage constrained by shunt impedance. To obtain a guideline model of the piezo/beam system with a negative capacitive shunting, the governing equations of motion are derived through the Hamilton's principle and a piezo sensor equation as well as a shunt-damping matrix is developed. The theoretical analysis shows that the piezo/beam system combined with a series and a parallel resistor-negative capacitor branch circuit developed in this study can significantly reduce the multiple-mode vibration amplitudes over the whole structural frequency range.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2002.11b
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• pp.228-233
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• 2002

General modeling of a resonant shunting damper has been made from piezoelectric sensor/actuator equation. It is found that an additional damping, which is augmented to a system, is generated by the shunt damping effect. The transfer function of the tuned electrical absorber is derived for both series and parallel shunt circuit. The governing equations and associated boundary conditions are derived using Hamilton's Principle. The shunt voltage equation is also derived from the charge generated in PZT due to beam vibration. The frequency response function of the obtained mathematical model is compared with that of the tuned electrical absorber and experimental work. The vibration amplitude is reduced about 15 dB at targeted second mode frequency.

• Journal of Chest Surgery
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• v.28 no.5
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• pp.495-498
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• 1995

Pulmonary arteriovenous fistula can be either congenital or acquired. The vast majority are congenital, and about 60% have been associated with hereditary hemorrhagic telangiectasia [Rendu-Osler-Weber disease . Secondary or acquired pulmonary arteriovenous fistula occurs with trauma, schistosomiasis, long-standing hepatic cirrhosis, metastatic carcinoma, and actinomycosis. Pulmonary hemorrhage secondary to acquired pulmonary arteriovenous fistula is a rare event associated with mortality. We have experienced 64 year-old female patient with the hemoptysis secondary to acquired pulmonary arteriovenous fistula due to the infection of pulmonary parasite. The chest PA and CT scan was showed calcified nodule to the distal portion of lateral segmental bronchus of RML. The bronchial angiogram was demonstrated slightly hypertrophied bronchial artery supplying RML bronchus and the presence of hypervascularization around the calcified nodule, rapid A-V shunting is noted by fluoroscopy. The patient was successfully treated by the right middle lobectomy.

• Journal of Korean Neurosurgical Society
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• v.41 no.1
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• pp.47-49
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• 2007

The authors describe a rare case of tension pneumocephalus, caused by ventriculoperitoneal[V-P] shunting for communicating hydrocephalus. The patient had a history of a right frontal skull fracture and pneumocephalus after a traffic accident five months prior to the present presentation of gait disturbance and memory impairment. A CT scan showed hydrocephalus and a V-P shunt was put in place. On the fourth day after surgery, the mental status of the patient gradually deteriorated due to a tension pneumocephalus; this was treated by repairing a fistula in the frontal sinus and a dural defect. The patient's mental status improved and symptoms were completely recovered. We report a case of tension pneumocephalus following V-P shunt for hydrocephalus in a patient who sustained a right frontal skull fracture.

• Journal of Korean Neurosurgical Society
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• v.45 no.1
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• pp.50-52
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• 2009

A 31-year-old man presented with dull headache and memory disturbance lasting for one week. Computed tomographic scans revealed acute hydrocephalus. The cerebrospinal fluid contained 53 leukocytes/$mm^3$, with a mononuclear preponderance and no erythrocytes. Magnetic resonance imaging revealed hydrocephalus and leptomeningeal enhancement. Magnetic resonance angiography and digital subtraction angiography showed supraclinoid occlusion of the right internal carotid artery, which resembled unilateral moyamoya disease. Neuroendoscopic biopsy of a lesion in the septum pellucidum revealed noncaseating granulomas, which was consistent with sarcoidosis. The patient was successfully managed with intravenous methylprednisolone and ventriculoperitoneal shunting. To our knowledge, this is the first case of moyamoya-like vasculopathy associated with neurosarcoidosis.

• Proceedings of the KSR Conference
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• 2004.06a
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• pp.528-533
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• 2004

The purpose of this thesis is to construct the autonomous decentralized train traffic management structure using techniques of Autonomous Decentralized System. Currently, a method of train traffic control is making use of CTC(Centralized Traffic Control). Its operation method is divided into the remote mode and the local mode. The classified basis is according to the control authority of install signals in track side. In most cases, a large scale station is operated by the local mode. Because of dispatchers in center can not control the shunting works influence on the main route. In order to solve these problem s, we analyzed a current operation condition and system requirements. Moreover, this thesis is constructing autonomous decentralized train traffic management structure. Finally, this research proposed that interface with CTC and step-by-step construction.

• Journal of Veterinary Clinics
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• v.21 no.3
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• pp.314-318
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• 2004

A 7-month-old 8.2 kg female Siberian Husky with history of exercise intolerance, delayed growth, and tachypnea was presented to Veterinary Medical Teaching Hospital, Kyungpook National University. A holosystolic murmur was identified in cardiac ausculation. In electrocardiography, thoracic radiographs, and ultrasonography, a right axis deviation, enlarged right ventricle, stenotic main pulmonary artery, large ventricular septal defect, marked right ventricle hypertrophy, and overriding aorta with dilation were identified. The color Doppler examination showed the left-to-right shunting of blood via interventricular septal defect and the blood flow streams converging from the right and left ventricles into the aorta. The dog was diagnosed as tetralogy of Fallot. The current state of the dog is well-tolerated without any specific medication.

• Journal of Soil and Groundwater Environment
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• v.23 no.4
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• pp.42-47
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• 2018

E. coli TG1 pBS TOM Green was cultured to produce toluene-o-monooxygenase (TOM). A biosensor system was successfully constructed using purified TOM to effectively detect trichloroethene (TCE) and tetrachloroethene (PCE), which represent some of the major contaminants in groundwater and soil. In order to utilize TOM as a sensor, NADH, a biological oxidizer, was replaced with hydrogen peroxide which is a chemical oxidizing agent. A three-layered sandwich-type sensing tip was fabricated on the outside of the hydrophilic polyvinylidene fluoride membrane. TCE and PCE were applied to the sensor and the hydrogen ions were measured by a fiber optic fluorometer using fluoresceinamine. Calibration curves were obtained for TCE and PCE in the concentration range of 0.2-100 mg/l, and the detection limit of the system was $10{\mu}g/l$ for TCE and PCE.

• 제어로봇시스템학회:학술대회논문집
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• 2001.10a
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• pp.149.6-149
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• 2001

We propose a neuron model that has the interactions between excitation and inhibition. By adopting the knowledge of the physiology, the neuron model by imitating structure of a neuron, has the system resemble a neuron. We considered a neuron system based on the arguments, and wished to examine whether the system had reasonable function Koch, Poggio and Torre believed that inhibition signal would shunt excitation signal on the dendrites. They believed that excitation signal operated input signals and inhibition did as delayed ones. Thus, they were sure that function for directional selectivity was arisen by the shunting. We construct the neuron system with Koch's concept. Our neuron model has 3-layer structure and ...