http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
칩 인덕터를 사용하여 광대역 저지 특성을 갖는 소형 C-밴드 Semi-Lumped 저역 통과 여파기
장기언(Ki-Eon Jang),이기문(Gi-Moon Lee),김하철(Ha-Chul Kim),최현철(Hyun-Chul Choi) 한국전자파학회 2012 한국전자파학회논문지 Vol.23 No.12
칩 인덕터를 이용하여 넓은 저지 대역과 소형화 특성을 갖는 C-밴드 semi-lumped 저역 통과 여파기를 제안하였다. 칩 인덕터의 자기 공진 주파수(SRF: Self Resonance Frequency) 특성을 유지하기 위하여 추가된 분리형 인덕터와 SRF 특성으로 인해 발생되는 감쇠 폴을 이용하여 광대역 저지 대역과 높은 저지 특성을 얻을 수 있었다. 3차 elliptic function 여파기에 칩 인덕터(L: 9.1 nH, SRF: 5.5 ㎓, Q: 25)를 적용한 결과, 마이크로스트립 라인 인덕터로 구현한 여파기보다 크기가 37.4 % 감소하였으며, 삽입 손실이 0.38 ㏈, 차단 주파수는 920 ㎒, 1.43~7.8 ㎓의 넓은 저지 대역(20 ㏈ 이하) 특성을 가졌다. The C-band semi-lumped lowpass filter with broad stopband and compact size characteristic using chip inductor is proposed. To provide an additional attenuation pole in stopband by SRF, a separable inductor is added to proposed structure, and it has broad stopband characteristic. The third order elliptic function lowpass filter with chip inductor(L: 9.1 nH, SRF: 5.5 ㎓, Q: 25) has insertion loss of 0.38 ㏈, cutoff frequency of 920 ㎒, broad stopband(below 20 ㏈) of 1.43~7.8 ㎓ and the size is reduced 37.4 % compared to distributed inductor.
에이로빅댄스 손상으로 발생한 대퇴골두골단분리증 : 증례 보고 A Case Report
장기언,홍석준,박태환,이숙자 대한스포츠의학회 1995 대한스포츠의학회지 Vol.13 No.2
Aerobic dance has become one of the most popular exercise to keep a health and to have a leisure time in Korea. This type of exercise have a basic principle ought to be performed in practice in order to obtain a beneficial physiological effect and to prevent the exercise injuries. But in many places this principle has not been kept because they did not recognize or because the equipment was not prepared. The most important principle of aerobic exercise is that the exercise program should he planned correspond to the individual body fitness. It has been reported that aerobic dance offers not only a benefit to health but also some body injuries when it was not performed correctly. The majority of types of injury reported recently were strains, sprains, tendinitis, bursitis and the most common sites of injury in the body were low back, shin, ankle, foot, knee and so on. Herein we report a rare case of aerobic dance injury, which has not been reported in Korea, slipped femoral capital epiphysis, which was developed by inappropriate exercise program and poor preparing for exercise.
박동식,강대수,김재성,김유제,장기언,허진강 대한스포츠의학회 2001 대한스포츠의학회지 Vol.19 No.2
The purpose of this study was to assess injury rate, injury type, body part injured, injury situation and mechanism in Athletes participating in one taekwondo competition for national representative athlete. Forty-eight Athletes(24 male & 24 female) participated in this final competition held in seoul during March 9, 1999 to March 12, 1999. We had taken a part of medical attendant in this games and retrospecitively analyzed medical records to be collected. Injury rate was 26.7(per 100 athlete-exposure)in men and 28.8 in women. The common injured body parts were lower extremity and face. Contusion was the most common injury type. Unblocked attack & Attacking a kick were common ones in the distribution of injuries by situation. Taekwondo competition showed high injury potential in both men and women. Therefore, It might not only be required more preventive measures, such as limit kicks to the head and the development of new protective equipments, but also provided more medical supervision.