• 제목/요약/키워드: BEPS

검색결과 7건 처리시간 0.017초

Multi-Rate and Multi-BEP Transmission Scheme Using Adaptive Overlapping Pulse-Position Modulator and Power Controller in Optical CDMA Systems

  • Miyazawa Takaya;Sasase Iwao
    • Journal of Communications and Networks
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    • 제7권4호
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    • pp.462-470
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    • 2005
  • We propose a multi-rate and multi-BEP transmission scheme using adaptive overlapping pulse-position modulator (OPPM) and optical power controller in optical code division multiple access (CDMA) networks. The proposed system achieves the multi-rate and multi-BEP transmission by accommodating users with different values of OPPM parameter and transmitted power in the same network. The proposed scheme has advantages that the system is not required to change the code length and number of weight depending on the required bit rate of a user and the difference of bit rates does not have so much effect on the bit error probabilities (BEPs). Moreover, the difference of transmitted powers does not cause the change of bit rate. We analyze the BEPs of the four multimedia service classes corresponding to the com­binations of high/low-rates and low/high-BEPs and show that the proposed scheme can easily achieve distinct differentiation of the service classes with the simple system configuration.

Mercury Emission Control in Japan

  • Takiguchi, Hiroaki;Tamura, Tomonori
    • Asian Journal of Atmospheric Environment
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    • 제12권1호
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    • pp.37-46
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    • 2018
  • The Minamata Convention on Mercury entered into force on August 16, 2017. It requires Parties to the Convention to control and, where feasible, reduce mercury emissions from the listed sources. To implement the Convention, Japan amended the Air Pollution Control Law and added clauses that force operators to control their mercury emissions below emission limit values (ELVs). The ELVs have been established separately for new and existing sources, targeting the source categories listed in the Convention: coal-fired boilers, smelting and roasting processes used in the production of non-ferrous metals (lead, zinc, copper and industrial gold), waste incineration facilities and cement clinker production facilities. The factors used to establish the ELVs include the present state of mercury emissions from the targeted categories as well as the mercury content in fuels and materials, best available techniques (BATs) and best environmental practices (BEPs) to control and reduce mercury emissions and ELVs or equivalent standards to control mercury emissions in other countries. In this regard, extensive data on mercury emissions from flue gas and the mercury content of fuels and materials were collected and analyzed. The established ELVs range from $8{\mu}g/Nm^3$ for new coal-fired boilers to $400{\mu}g/Nm^3$ for existing secondary smelting processes used in the production of copper, lead and zinc. This paper illustrates the ELVs for the targeted source categories, explaining the rationales and approaches used to set the values. The amended Law is to be enforced on April 1, 2018. From future perspectives, checks of the material flow of mercury, following up on the state of compliance, review of the ELVs and of the measurement and monitoring methods have been noted as important issues.

ART의 위상 정보를 이용한 형태기반 영상 검색 방법 (A Shape Based Image Retrieval Method using Phase of ART)

  • 이종민;김회율
    • 방송공학회논문지
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    • 제17권1호
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    • pp.26-36
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    • 2012
  • 영상에 포함된 객체의 형태는 내용 기반 영상검색에 있어서 중요한 정보를 가지고 있기 때문에, 이를 이용하여 영상을 검색하는 방법들이 활발히 연구되어 왔다. 그중에서도 최근에 제안된 저니키 모멘트의 위상과 크기를 이용하는 회전불변 서술자(IZMD: Invariant Zernike moment descriptor)을 이용한 영상 검색 방법은 기존의 크기 정보만을 이용한 저니키 모멘트 서술자보다 높은 영상 검색 성능을 보인다. 본 논문에서는 IZMD를 이용한 방법 보다 향상된 영상 검색 성능을 얻기 위해서 ART(Angular Radial Transform)의 크기와 위상을 이용한 회전 불변 특징 서술자(IARTD: Invariant Angular Radial Transform Descriptor)와 이를 이용해서 영상을 정합하는 방법을 제안한다. IARTD는 ART 기저함수의 특성을 이용해서 정렬된 ART 계수의 위상과 크기로 구성된 특징벡터이다. 영상의 검색은 두 IARTD의 크기차이와 위상차이의 곱을 이용하여 정의된 거리 계산 방법을 이용해서 수행한다. MPEG-7 데이터셋을 이용한 실험 결과, 제안하는 방법의 평균 BEP(Bull's Eye performance)는 0.5806으로서, ARTD나 IZMD를 이용한 영상 검색 결과의 평균 BEP 0.3574, 0.4234보다 우수한 검색 성능을 제공하는 것을 확인하였다.

플라즈마분자선에피탁시법을 이용한 C-면 사파이어 기판 위질화인듐갈륨박막의 에피탁시 성장 (Plasma-Assisted Molecular Beam Epitaxy of InXGa1-XN Films on C-plane Sapphire Substrates)

  • 신은정;임동석;임세환;한석규;이효성;홍순구;정명호;이정용
    • 한국재료학회지
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    • 제22권4호
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    • pp.185-189
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    • 2012
  • We report plasma-assisted molecular beam epitaxy of $In_XGa_{1-X}N$ films on c-plane sapphire substrates. Prior to the growth of $In_XGa_{1-X}N$ films, GaN film was grown on the nitride c-plane sapphire substrate by two-dimensional (2D) growth mode. For the growth of GaN, Ga flux of $3.7{\times}10^{-8}$ torr as a beam equivalent pressure (BEP) and a plasma power of 150 W with a nitrogen flow rate of 0.76 sccm were fixed. The growth of 2D GaN growth was confirmed by $in-situ$ reflection high-energy electron diffraction (RHEED) by observing a streaky RHEED pattern with a strong specular spot. InN films showed lower growth rates even with the same growth conditions (same growth temperature, same plasma condition, and same BEP value of III element) than those of GaN films. It was observed that the growth rate of GaN is 1.7 times higher than that of InN, which is probably caused by the higher vapor pressure of In. For the growth of $In_xGa_{1-x}N$ films with different In compositions, total III-element flux (Ga plus In BEPs) was set to $3.7{\times}10^{-8}$ torr, which was the BEP value for the 2D growth of GaN. The In compositions of the $In_xGa_{1-x}N$ films were determined to be 28, 41, 45, and 53% based on the peak position of (0002) reflection in x-ray ${\theta}-2{\theta}$ measurements. The growth of $In_xGa_{1-x}N$ films did not show a streaky RHEED pattern but showed spotty patterns with weak streaky lines. This means that the net sticking coefficients of In and Ga, considered based on the growth rates of GaN and InN, are not the only factor governing the growth mode; another factor such as migration velocity should be considered. The sample with an In composition of 41% showed the lowest full width at half maximum value of 0.20 degree from the x-ray (0002) omega rocking curve measurements and the lowest root mean square roughness value of 0.71 nm.

Thin Capitalization - The Arm's Length Approach through Blockchain

  • Lee, Jeong-Mi
    • 한국컴퓨터정보학회논문지
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    • 제25권10호
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    • pp.185-191
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    • 2020
  • 본 연구는 디지털 경제하에서 고정사업장 확대로 인한 차입금의 범위가 확대됨으로써 과소자본세제에서 차입금에 대한 지급이자 산정하는 방법을 이전가격과세제도의 정상가격방법으로 일원화하는 방안을 제시하며 정상가격 도출과 관련하여 블록체인 기반 환경 구축에 대한 필요성을 제시하고자 한다. 과소자본세제의 이자공제가 가능한 차입금 금액을 산정 시 이전가격과세제도의 정상가격방법으로 일원화하는 방안은 이전가격세제의 적용범위가 과소자본세제의 적용범위를 포함하기에 조세조약상 및 통상조약상 무차별 원칙이 외국인이 투자한 내국법인과 외국법인의 국내사업장 및 순수내국법인에게도 적용되기에 해결 될 수 있다. 차입금에 관한 '특수관계가 없는 자 간의 통상적인 차입'에 대한 규정 부재에 대한 문제는 블록체인 플랫폼 기반에 공유되는 거래로 인해 차입금에 대한 비교가능한 거래가 투명하게 공유됨으로써 비교가능한 차입규모 및 차입 조건의 범위에 대한 문제점을 해결 할 수 있다. 본 연구는 이자비용을 활용한 소득이전을 방지하고자 하는 과소자본세제제도에 대한 문제점과 개선안을 제시함으로써 정책 입안 및 수행하는 당국에 정책적 방향성을 제공한다는 점에서 본 연구의 공헌점이 있다 하겠다.