• 전기학회논문지P
• /
• 제58권1호
• /
• pp.85-89
• /
• 2009

We investigated the quench characteristics in accordance with increase of turns number of trigger coil and shunt resistance of matrix-type superconducting fault current limiter (SFCL) with $2{\times}3$ array. The matrix-type SFCL consists of the trigger part to apply magnetic field and the current-limiting part to limit fault current. The fault current limiting characteristics according to the increase of magnetic field and applied voltage were nearly same. This is because the application of magnetic field hasn't an affect on total impedance of the SFCL. When turns number of a reactor increased, the voltage difference between two superconducting units in the current-limiting part according was decreased. The resistance difference generated in two superconducting units was also decreased. Therefore, we confirmed that the differences of the critical behaviors between superconducting units were reduced by application of magnetic field. By this results, we could decide the optimum turns number of reactor to apply magnetic field.

• Neonatal Medicine
• /
• 제15권2호
• /
• pp.176-182
• /
• 2008

드문 선천성 문맥전신성 단락에 대한 표준화된 치료는 없으나 저자들은 출생 직후부터 심부전 증상을 보인 환아에서 심실 중격 결손증을 동반한 선천성 문맥전신성단락을 4회의 코일 색전술 및 심 교정술로 치료한 증례를 경험하였기에 문헌고찰과 함께 보고하는 바이다.

• Journal of Chest Surgery
• /
• 제50권3호
• /
• pp.215-219
• /
• 2017

Pulmonary arteriovenous fistula (PAVF) is a complication of the Glenn shunt. A 57-year-old tetralogy of Fallot (TOF) patient, who had undergone a Glenn shunt and TOF total correction, complained of dyspnea and cyanosis. PAVFs were present in the rig ht lung, and rig ht lung perfusion was nearly absent. After coil embolization, takedown of the Glenn shunt, and reconstruction of the rig ht pulmonary artery, the patient's symptoms were relieved. Extrapulmonary radioisotope uptake caused by the PAVFs shown in lung perfusion scans decreased, and right lung perfusion increased gradually. Although the development and resolution of PAVFs after a Glenn shunt have been reported in the pediatric population, this may be the first report on this change in old age.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2000년도 하계학술대회 논문집 B
• /
• pp.787-789
• /
• 2000

This paper describes the theory and practical design of Rogowski coil and active integrator. The coils and integrators have the ratings as follows. 1) current ratings between 20kArms and 200kArms 2) current duration 3 seconds 3) time constant of primary circuit looms 4) inner diameter of coil is suitable for mounting at the busbar $200mm{\times}200mm$. The actual results in the short-circuit tests and compare with other sensors, such that shunt. are given also.

• 한국임상수의학회:학술대회논문집
• /
• 한국임상수의학회 2007년도 춘계학술대회
• /
• pp.146-146
• /
• 2007

• 한국초전도학회:학술대회논문집
• /
• 한국초전도학회 2009년도 Korea Superconductivity Society Meeting 2009
• /
• pp.58-58
• /
• 2009

• 대한수의학회지
• /
• 제47권4호
• /
• pp.461-467
• /
• 2007

A 6-year-old female Maltese dog (body weight 2.0 kg) was referred to the Veterinary Teaching Hospital, Kangwon National University with primary complaints including exercise intolerance and heart murmur. Based on clinical and diagnostic findings including grade V/VI left basal continuous murmur, bounding femoral pulsation, left ventricular enlargement pattern in electrocardiogram, cardiomegaly with aortic bulging on the thoracic radiography, and shunt flow between aorta and pulmonary artery on the echocardiography, the dog was diagnosed as the left-to-right patent ductus arteriosus. The patent ductus arteriosus was successfully treated by lodging a single embolization coil with transjugular approach.

• 대한영상의학회지
• /
• 제83권6호
• /
• pp.1426-1431
• /
• 2022

간내 문맥정맥단락은 간문맥-대정맥 또는 간문맥-간정맥이 연결되어 있는 드문 혈관 질환이다. 간내 문맥정맥단락은 주로 무증상을 보이며, 다른 질환으로 영상 검사를 하였을 때 우연히 발견될 수 있다. 하지만 단락양이 많거나 증상이 있는 경우 단락 색전술을 고려하여야 한다. 저자들은 선천성 간내 문맥정맥단락 환자에서 갑자기 간성뇌증이 발생하여 이를 경간 코일 색전술로 치료한 증례를 보고하고자 한다.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2007년도 제38회 하계학술대회
• /
• pp.977-978
• /
• 2007

The phase angle which is mainly depend on time constant $\tau$ of the calculable 10 A and 0.1 ${\Omega}ac/dc$ resistor has been analysed. The low values of resistors are usually inductive and time constant $\tau$ very large compare to high values of resistors. The numerical analysis has been shown that the time constant $\tau$ becomes zero when introduce the compensation capacitance geometrically to the resistive coil with proper dimension. As a result a very low phase angle can be achieved within the realizable dimensions.

• Journal of information and communication convergence engineering
• /
• 제5권2호
• /
• pp.150-154
• /
• 2007

Transponders of RFID system are classified as active or passive depending on the type of power supply they use. In passive transponders the data carrier has to obtain its power from the induced voltage. The induced voltage is converted into direct current using a low loss bridge rectifier and then smoothed. In practice, the induced voltage in the transponder coil is variable according to the coupling coefficient k and the load resistance ($R_L$). Therefore, the rectified voltage is unstable and the transponder of RFID is unstable sometimes. In this paper, a voltage-dependent shunt resistor ($R_s$) circuits are designed and inserted in parallel with the load resistance of RFID transponder in order to improve the stability of power.