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전형준,강창수,Jeon, Hyung-Joon,Kang, Chang-Soo 대한전자공학회 2005 電子工學會論文誌 IE (Industry electronics) Vol.42 No.4
본 논문에서는 삼중모드 공동 공진기를 이용하여 위성 탑재용 2단 6-pole 대역통과 필터를 설계 제작하였다. 대역통과 필터는 중심 주파수 14.5GHz(Ku-band)에서 대역폭 100MHz로 설계하였으며 응답은 Chebyshev 함수를 이용하였다. 공동 공진기의 공진모드는 TE113과 TM012 모드를 이용하였다. 공동 공진기간의 결합(intercavity coupling)은 Chebyshev 필터 응답을 구현하기 위하여 TE113 모드의 자계 성분만을 결합하였다. 따라서 원통형 공동 공진기내의 TE모드와 TM모드에 대한 E-,H-field 기본식으로부터 결합계수 수식을 유도하여 이를 intercavity 슬롯의 위치와 크기를 결정하는데 이용하였다. 설계 제작된 2단 6-pole 삼중모드 공동 공진기 대역통과 필터의 통과 대역폭에의 평균 삽입손실은 2.4dB이며 통과 대역의 반사손실 S11은 평균 15dB 이상으로 측정되었다. 본 논문에서 제작된 삼중모드 필터는 위성 탑재 장치내에 채널 필터 및 일반 시스템의 필터 어셈블리를 소형화시키는데 적용가능할 것으로 판단된다. In this paper, a 2 stage 6-pole bandpass filter(BPF) is designed and implemented by using triple-mode cavity for satellite payload system. The BPF has a 100MHz bandwidth at the center frequency of 14.5GHz(Ku-band) and the response of the filter is the Chebyshev function. The cavity filter uses two orthogonal $TM_{113}$ modes and one $TM_{012}$ mode. The coupling between the adjacent cavityes(intercavity coupling) results in a Chebyshev response and is accomplished by only H-filed component of If modes. The size and location of intercavity slot is determined by the coupling equation from E-and H-field of TE and TM resonant modes in circular cavity. The 2-stage 6-pole triple-mode cavity BPF has the insertion loss of 2.4dB and the reflection loss of 15dB in the passband. The triple-mode BPF proposed in this thesis can be used as channel filters for satellite payload system and can minimize filter assembly in general wireless communication system.
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중증 뇌동맥류 환자의 조기 수술과 3차원 전산화 단층 뇌혈관 조영술
전형준,이형중,김광명,김영수,고용,오석전 대한신경외과학회 2003 Journal of Korean neurosurgical society Vol.33 No.4
Objective:The authors studied the feasibility of 3-Dimensional computed tomographic angiography(3-D CTA) in early surgery for poor grade patients with aneurysmal subarachnoid hemorrhage(SAH), therefore intended to verify the eligibility of this diagnostic tool in these special clinical settings. Methods:During the period between July 1997 and December 2000, we studied 31 patients diagnosed as aneurysmal SAH that were classified as the Hunt-Hess grade IV or V and Fisher group III or IV. As the conventional angiography could not be conducted because of the patients' poor clinical conditions, we carried out early surgery on the same day of SAH solely based on the 3-D CTA. We compared the 3-D CTA features with intraoperative findings. Results:Total of 33 aneurysms were found in preoperative 3-D CTA and, of them, all 31 ruptured aneurysms and additional another two unruptured ones were also. Undetected three aneurysms were found in the operative field(2 cases) and postoperative digital subtraction angiography(1 case). The sensitivity of 3-D CTA was 94.7% and specificity was 100%. Conclusion:According to our results, 3-D CTA might be sufficient for early surgery of intracranial aneurysms in poor grade SAH patients in urgent conditions. Key words:Intracranial Aneurysm;Subarachnoid Hemorrhage(SAH);3-Dimensional Computed Tomographic Angiography(3-D CTA);Early Operation;Poor Grade.
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전자화폐 보급·확산에 따른 향후 조세정책방향에 대한 연구 : 탈세모형을 중심으로
전형준,이만우,박기홍 한국재정.공공경제학회 2003 재정논집 Vol.17 No.2
본 논문에서는 기존 문헌들에서 구체적으로 다루어지지 못했던 전자화폐 등장으로 인한 조세회피(tax avoidance) 및 탈세 (tax evasion) 등에 관한 연구, 즉 기존의 지불·결제수단과 다른 특징을 가진 전자화폐의 등장 및 새로운 정보통신기술의 발달, 그리고 온라인(on-line)상에서의 상거래 및 금융거래의 보편화와 같은 경제환경의 변화등과 관련하여 조세관련 문제의 증가가능성을 탈세모형을 이용하여 이론적으로 살펴보고, 이에 따른 앞으로의 조세정책방향을 제시하고자 한다. As commerce move to the Internet, the age of electronic money surely will not be far behind. What the tax authorities finds there, however is an environment that poses some fairly fundamental challenges to long-held principles of tax administration and tax policy. What is worse, moving money at the speed of light to any place in the world anonymously over the Internet will soon be as easy as a few keystrokes on your personal computer. Such anonymous money movements substantially increase the potential that the size of the identifiable tax base will be diminished. Government tax authorities are challenged and threatened by this new technology. The danger is that if the current tax system is retained, government will become even more intrusive as it tries to stop tax avoidance, tax evasion, and money laundering etc. we should know that "the more the government tries to tax regulate, control, and confiscate, the greater the incentive for the problems associated with the use of electronic money-tax avoidance, tax evasion, money laundering etc." This paper discusses possible consequences of electronic money from the view of taxation and shows the theoretical analysis in income tax evasion. Our studies suggest future tax policy direction for electronic money. First. we should pay attention to change of taxation environment as a result of electronic money. Second, we should all work together to secure resonable tax base and tax revenue with the combination of low tax rate to get more compliance behavior of tax payers. Third, we should know that long-held principles of tax administration and tax policy may be required adjusting the principles to apply them to Internet transaction and electronic money.
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