• 항공우주정책ㆍ법학회지
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• 제29권2호
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• pp.239-272
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• 2014

지구정지궤도는 위성통신과 방송을 위한 필수요소로서 ITU 체제가 그 관리의 중심이다. ITU체제는 지구정지궤도를 이용하고자 하는 주관청의 사전신청 및 조정 의무를 규정하고 있으며, ITU 사무국과 RRB는 등록원부 등재 및 삭제를 통해서 정지궤도 이용권을 관리하고 있다. 등록원부에 등재된 위성망 정보는 관련 주관청과의 조정의 결과에 따라서 그 지위가 달라진다. ITU 무선규칙은 위성망 정보를 등재한 주관청이 실제로 위성을 운용하는가의 여부에 따라서 등재정보가 삭제 또는 변경되도록 하여 지구정지궤도가 필요한 주관청이 실질적으로 사용할 기회를 보장하고 있다. 그러나 위성망을 신청하는 주관청 국가의 국적과 지구정지궤도에서 실제로 운용되는 인공위성의 국적이 같아야 한다는 규정이 없으며, 또한 위성망을 신청한 주관청 국가와 인공위성간의 연결관계에 관한 규정도 없고, 주관청과 위성망 소유 기업간의 연결 관계에 관한 규정도 없다. 이러한 상황에서 지구정지궤도를 둘러싼 분쟁은 사실상 주관청만이 아니라 기업이 등장하는 조정을 통해서 해결되고 있다. 그 결과는 위성 궤도를 거래하는 사실상의 이차 시장의 등장이다. 이차 시장의 존재는 기존의 ITU 무선규칙 및 사무국과 RRB의 역할에 따른 제도적 틀의 한계를 입증한다. 예컨대 RRB는 제13.6조를 적용하지 않기로 결정하고, 당사자간의 조정을 촉구하는 것으로 자신의 업무를 한정한 바 있고, 주관청간의 위성망 거래가 합법임을 사실상 인정하고 있다. ITU의 무선규칙상 또한 RRB의 방침상 인공위성과 궤도의 그러한 거래는 위법이 아니다. 무궁화위성 3호의 국적이 대한민국이더라도 홍콩 소재 기업이 다른 주관청과 합의하여 그 주관청 명의의 위성망 신청하에 무궁화 위성 3호를 사용하고 있다의 증거로 사용할 수 있다. 무궁화 위성 3호의 매각이 국내법 위반이어서 매각계약 자체가 무효라 하더라도 마찬가지이다. 이제 동경 116도의 Ka 밴드 이용권은 ITU가 주관하는 분양시장이 아니라 ITU가 등기소 역할만을 하는 장외시장에 나온 매물이다.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제11B권3호
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• pp.104-111
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• 2001

The design procedures and experimental results of a single-stage electronic ballast using half-bridge resonant inverter are presented in this paper. The proposed topology is based on a single-stage ballast which combines a boost converter and a half-bradge series resonant inverter. High power factor is achieved by using the boost semi-stage operating in discontinuous conduction mode and inverter semi-stage operated above resonant frequency to provide zero voltage switching is empolyed to ballast the fluorescent lamp Experimental results from the ballast system with 36W fluorescent

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제11B권3호
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• pp.64-69
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• 2001

Energy recovery in the regenerative region is very important when SRM is used in traction drive, This is to reduce en-ergy loss during mechanical braking and/or to have a high efficiency drive during braking To control excitation voltage in motor operation and regenerative voltage in the generator operation in the SRM multi-level voltage control is effective The paper sug-gests multi-level inverter which is useful for motoring and regenerative operation in SRM

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제11B권3호
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• pp.59-63
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• 2001

This paper presents a new modeling of the two dimensional magnetic property in soft magnetic materials for the magnetic field computations. In this modeling an approximate treatment is introduced to expand the applicable exciting frequency range. The result shows that the new modeling presented here is very useful in simplicity of magnetic field analysis.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제11B권4호
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• pp.121-128
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• 2001

Numerical schemes for the simulation of the cold gas flow in the SF6 puffer type circuit breaker is presented. The governing equation is axisymmetric compressible Euler Equation and FVM is used to analyze the behavior of flow. The upwind scheme is used to avoid numerical instability and MUSCL is used to obtain high order accuracy. For the efficient calculation, AF-ADI scheme is used. The simulation result shows good agreement with the experimental data.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제4B권4호
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• pp.170-179
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• 2004

The paper presents technical issues which integrated sensors must address to be implemented in the next generation of power electronics and motor drives. The underlying goal of the sensor integration will be to improve reliability of power conversion systems while making the power converter and motor drive become the primary source of diagnostic signals for the application. The paper focuses on design methodologies that will allow this integration to succeed in meeting the technical demands for both reliability and for application level diagnostics.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제4B권4호
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• pp.157-169
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• 2004

Motor & generator operation at widely variable speeds is needed in various applications but hybrid and electric vehicle (HEV) stand out today, as quite a few companies are launching this year their mass production of HEVs. The quest for better starter-generators is far from ended, though. The present review paper unfolds a comparative critical evaluation of various starter-generators and their control for HEV. Induction, interior PM synchronous, transverse-flux PM synchronous, switched reluctance, together with claw-pole and biaxial excitation PM synchronous (BEGA) configurations with their control are all considered in system evaluations.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제4B권4호
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• pp.190-195
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• 2004

This paper presents the analysis of the effects of non-uniform slots in a line start permanent magnet (LSPM) motor. For purposes of the investigation, the simple formula of $2^{nd}$resistance for rotors having different slot areas is deduced. The characteristic analysis using the formula is performed and compared with measurement results.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제5B권2호
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• pp.97-102
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• 2005

Because of the limited fossil resources and the need to avoid emissions and toxic waste the future energy supply will be based on a large portion of renewable energies: wind-, solar-, biomass- and geothermal energy. Focus is on the utilization of wind energy coming from onshore- and offshore-sites. Generating electricity from wind is state of the art and feeding large amounts of wind power into the electrical grid will create some additional problems. Suggestions concerning energy storage will be made and the problem of power quality is discussed.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제5B권3호
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• pp.262-266
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• 2005

In this paper, in order to enhance thrust of slotless type Permanent Magnet Linear Synchronous Motor, an optimal design is achieved by combining a genetic algorithm with 3D space harmonic method. In the case of multi-objective functions, the ratio of thrust/weight and thrust/volume are increased by $\7.56[%]l\;and\;7.98\[%]$, respectively. Thus, miniaturization and lightweight were realized at the same time.