소리의 공간 제어를 위한 구형 다채널 스피커 어레이 설계

강동수,최정우,이정민,김양한,Kang, Dong-Soo,Choi, Jung-Woo,Lee, Jung-Min,Kim, Yang-Hann 한국음향학회 2012 韓國音響學會誌 Vol.31 No.4

The objective of this paper is to design multichannel spherical loudspeaker array by considering various positioning methods such as Gaussian grid, Lebedev grid and packing method. For the spatial sound manipulation, which is to make desired sound field by controling multiple sound sources, the Kirchhoff-Helmholtz integral states that sound fields can be reproduced in terms of infinite control sources on the integral surface. But since we cannot control infinite number of sources for the implementation, we have to allocate finite number of sound sources which can approximately act as infinite number of sources. To manipulate sound field inside of a sphere (which is typical example of three dimensional array) by controlling sound sources on the surface, three methods of allocating sound sources, which are Gaussian grid, Lebedev grid and packing method, are reviewed. For each geometry, the performances of manipulation rendered by time-reversal operator and higher-order ambisonics are compared. The objective of this paper is to design multichannel spherical loudspeaker array by considering various positioning methods such as Gaussian grid, Lebedev grid and packing method. For the spatial sound manipulation, which is to make desired sound field by controling multiple sound sources, the Kirchhoff- Helmholtz integral states that sound fields can be reproduced in terms of infinite control sources on the integral surface. But since we cannot control infinite number of sources for the implementation, we have to allocate finite number of sound sources which can approximately act as infinite number of sources. To manipulate sound field inside of a sphere (which is typical example of three dimensional array) by controlling sound sources on the surface, three methods of allocating sound sources, which are Gaussian grid, Lebedev grid and packing method, are reviewed. For each geometry, the performances of manipulation rendered by time-reversal operator and higher-order ambisonics are compared.

금융기관의 반응 및 가계자산 포트폴리오를 고려한 특별예금보험료의 가계 손실분담구조

강동수,성태윤,Kang, Dongsoo,Sung, Taeyoon 한국개발연구원 2003 KDI Journal of Economic Policy (KDI JEP) Vol.25 No.1

본 연구는 공적자금상환을 위해 도입된 특별예금보험료 부과의 함의를 분석한다. 금융기관은 특별예금보험료를 추가적인 비용으로 인식하여 그 비용의 일부를 금융소비자에게 전가하려는 행위를 보일 것으로 예상된다. 계량분석 결과 금융기관은 금리에 민감하게 반응하는 대출보다는 예금으로 비용의 전가를 시도할 것으로 추정되었다. 그리고 부보대상예금의 상대적 비중이 고자산계층보다 저자산계층에서 높다는 가계자산 포트폴리오의 특징으로 인해 특별예금보험료 부과는 저자산계층에게 보유자산에 대비하여 상대적으로 높은 손실분담구조가 될 수 있음을 시사한다. This paper studies the effects of the special surcharge on deposits, proposed as a plan to finance the costs of restructuring Korean corporate and financial sectors. Specifically, the study analyzes the change in the autonomous behavior of economic agents in terms of cost transfer and substitution effects. Given the result that the growth rate of deposits does not respond to the change of interest rates so much as that of loans, financial institutions have more incentive to transfer the costs incurred by the special surcharge to depositors. This paper also reports that the portfolio of households show a noteworthy feature that insured deposits have a relatively small portion in terms of total assets for high-asset class households, whereas most assets for low-asset class households are subject to the special surcharge.

동태적 대손충당금제도 도입의 타당성 분석

강동수,Kang, Dongsoo 한국개발연구원 2006 韓國 開發 硏究 Vol.28 No.2

본 연구에서는 우리나라의 동태적 대손충당금제도 도입의 타당성에 대한 실증분석을 실시하였다. 동태적 대손충당금이 요청되는 환경은 은행이 경기상승국면에서 대출을 증가시키면서도 대손충당금 적립에 소홀하거나 단기적인 업적에 집착하여 수익이 증가하는 시점에서 대손충당금을 적게 적립하는 경우이다. 그런데 우리나라에서는 대손충당금 적립의 경기순응성이 존재하는 것으로 나타날 뿐만 아니라 은행이 동태적으로 수익을 평준화하는 경향이 있어서 대손충당금 적립관행이 비교적 건전한 것으로 분석되었다. 따라서 경기중화적인 동태적 대손충당금제도의 도입이 절실한 상황은 아니라고 할 수 있다. 다만 금융구조조정이 완료된 이후 대손충당금 적립행태가 경기역행적으로 변모할 개연성이 높아지고 있고, 일반은행의 외국인 지분율이 상승하면서 은행 경영진에 대한 단기업적주의의 압력이 증가할 경우 대손충당금의 탄력적 적립을 통한 수익평준화 성향이 훼손될 우려도 제기되고 있다. 따라서 금융시스템의 안정성을 제고한다는 관점에서 대손충당금 적립요건을 강화할것을 제안한다. This study investigates whether dynamic loan loss provisioning is necessary in Korean banking environments. Under the dynamic provisioning rule banks are required to accumulate additional reserves to general and specific provisionings in preparation for expected loan losses until maturity. This provisioning is most effective in the case that banks tend to recognize less loan losses in the business upturns and/or in the periods of increasing profits. The empirical study, however, shows that banks support procyclicality of loan loss privisioning and earning smoothing behavior over profit fluctuations. These findings suggest that Korea would not seriously need the introduction of dynamic loan loss provisioning. But this policy implication does not seem robust in view that the recent experience shows the countercyclicality of loan loss provisioning practices and negative correlation between earnings and provisioning after financial restructuring was completed. This result is partly attributable to vigorous shareholder activism because of high foreign ownership of most commercial banks. Once it is true that bank management is more interested in short-term performances, current loan loss provisioning would have attributes of impairing capital adequacy, hence strengthening loan loss provisiong requirements.

연구문헌분석을 활용한 교통문화지수의 개선방향에 관한 연구

강동수,조성진,이수일,김태호,Kang, Dong-Soo,Jo, Sung-Jin,Lee, Soo-Il,Kim, Tae-Ho 대한교통학회 2011 교통 기술과 정책 Vol.8 No.4

교통안전 선진국 진입을 위한 제7차 국가교통안전기본계획

강동수,이헌주,신성필,Kang, Dong-Soo,Lee, Heon-Ju,Shin, Sung-Pil 대한교통학회 2011 교통 기술과 정책 Vol.8 No.4

알루미늄 기판에 코팅된 흑연입자의 배향도 변화와 열방사율 변화의 관계

강동수,이상민,김석환,이상우,노재승,Kang, Dong Su,Lee, Sang Min,Kim, Suk Hwan,Lee, Sang Woo,Roh, Jae Seung 한국재료학회 2014 한국재료학회지 Vol.24 No.3

This study is research on the thermal emissivity depending on the alignment degrees of graphite flakes. Samples were manufactured by a slurry of natural graphite flakes with organic binder and subsequent dip-coating on an aluminum substrate. The alignment degrees were controlled by applying magnetic field strength (0, 1, and 3 kG) to the coated samples. The alignment degree of the sample was measured by XRD. The thermal emissivity was measured by an infrared thermal image camera at $100^{\circ}C$. The alignment degrees were 0.04, 0.11, and 0.17 and the applied magnetic field strengths were 0, 1, and 3 kG, respectively. The thermal emissivities were 0.829, 0.837, and 0.844 and the applying magnetic field strengths were 0, 1, and 3 kG, respectively. In this study the correlation coefficient, $R^2$, between thermal emissivity and alignment degree was 0.997. Therefore, it was concluded that the thermal emissivities are correlated with the alignment degree of the graphite flakes.

포르투갈 교통사고 사상자 절반줄이기 성과에 대한 고찰

강동수,김기용,Kang, Dong-Soo,Kim, Ki-Yong 대한교통학회 2010 교통 기술과 정책 Vol.7 No.3

RF 마그네트론 스퍼터링을 이용한 WO₃/Ag/WO₃ 투명전극의 전기ㆍ광학적 특성 연구

강동수(Dong-Soo Kang),이붕주(Boong-Joo Lee),권홍규(Hong-Kyu Kwon),신백균(Paik-Kyun Shin) 대한전기학회 2014 전기학회논문지 Vol.63 No.11

WO₃/Ag/WO₃ multilayer was researched by using RF magnetron sputtering with transparent electrode. Process gas flow ratio with Ar/O₂ were selected the optimum conditions at 70sccm/2sccm and WO₃ thin film at its conditions was appeared at transmittance about 80% in the visible light region to the average. WO₃/Ag/WO₃ multilayer thin films were fabricated from the same process condition which was the same gas flow ratio of Ar and O₂ WO₃/Ag/WO3 thin films were appeared transmittance about 93% and sheet resistance about 6.41Ω/□. From the SEM images, each thin films were appeared when WO₃ is 40㎚ and O₂ is 10㎚.

선박검사와 관련한 몇가지 법률문제

강동수(Kang Dong-Soo) 한국해사법학회 2001 해사법연구 Vol.13 No.1

선장의 공법상 권한

강동수 ( Kang Dong Su ) 한국해법학회 2004 韓國海法學會誌 Vol.26 No.1

A ship`s master exercises the various rights on the maritime public law which are mostly endowed from a nation. These authorities are originated in the special position on which the master must fulfill his responsibility of ensuring ship`s navigation safety. In the case of performing his official duties based on the law, he has the authority of a private individual exercising official duties(Beliehene). Therefore the master becomes the object of administrative suit on his official duties where he has legal relations with the third party. If any damage is happened, the nation can be demanded the reparation for the damage. Moreover the possibility of terror for public traffic facilities is recently increased by Islamic fundamentalists. So the master is needed the legal systemic countermove on which he can conduct an investigation of a criminal and delict and take of evidence on the ship in position of a judicial police officer according to special criminal law and he can properly cope with judicial administration for terrorist on the sea according to SUA Convention. The purpose of this study is to examine closely authorities of the master in public law and to emphasize the role of the master as a judicial police office.