• 주택과사람들
• /
• no.57 s.74
• /
• pp.59-65
• /
• 1996

이 자료는 주택산업연구원이 지난 6월 13일 건설회관 2층 대회의실에서 ''21세기의 주택수요 전망''이라는 주제로 개최된 세미나 자료를 요약한 것으로 이날 세미나에서는 주택산업연구원의 남희용 연구위원이 $\lceil$지역별 주택수요 전망$\rfloor$을, 고태경 수석연구원이 $\lceil$공동주택단지의 질적인 향상을 위한 선호조사$\rfloor$를 각각 주게발표 했으며, 사회는 정희수 주택산업연구원장이, 토론자로는 김기호 서울시립대학교 교수와 배순석 국토개발연구원 연구위원이 참석했다.

• Electrical & Electronic Materials
• /
• v.13 no.8
• /
• pp.1-6
• /
• 2000

21세기의 시작과 함께 디지털 방송이 본격적으로 추진됨에 따라 가장 적합한 Disply로써 부각되고 있는 PDP에 대하여, 개발되고 있는 현재의 과제 및 신기술을 소개하고, PDP의 시장 및 동향을 알아봄으로써 향후 PDP기술 개발 방향을 예측해보고자한다.

• Korean Journal of Optics and Photonics
• /
• v.13 no.5
• /
• pp.400-407
• /
• 2002

Two dimensional solitary waves are stably propagated in a saturable medium which has a saturable nonlinear index as input intensity. However, in the case of low intensity. a negative fifth-order nonlinear medium has properties of a saturable medium. So a Gaussian beam travels stably. The propagation process into the fifth order nonlinear medium of the Gaussian beam with a weak intensity is investigated by using the computer simulation of the two-dimensional nonlinear Schrodinger equation. As a result, it is confirmed that the two-dimensional spatial solitary waves are stably propagated in this medium when the incident powers are self-trapping powers. In the condition of the phase difference and collisional angle between two input beams of 180 degree and 0.05 degree, respectively, we can confirm that all optical switching is as simple as controlling the incident power of one input beam.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.13 no.5
• /
• pp.55-63
• /
• 2013

In cognitive radio networks, acquirement of position information of primary user is very important to secondary network since localization information of primary users can be utilized for improving the spectrum efficiency of secondary network and for avoiding harmful interference to primary users by using proper power control. Among various location methods, Received Signal Strength (RSS)-based localization has been widely used for distance measurements in the location detection process despite its inherent inaccuracy because it can be easily implemented without any additional hardware cost. In the RSS-based localization, the distance is measured by the received signal strength, and distance error can be caused by many factors such as fading, shadowing and obstacle between two nodes. In the paper, therefore we propose a localization scheme based on estimation of path-loss exponent to localize the location of primary users more accurately. Through simulations, it is shown that the proposed scheme can provide less localization error and interference rate to primary users than other schemes.

• Archives of design research
• /
• v.13 no.2
• /
• pp.81-86
• /
• 2000

From the ancient civilization, Japanese have maintained a homogeneous domestic culture while they have constantly received external ideas. They have received many conflicting and contradictory ideas and phenomena and surprisingly, they blend them successfully into their own culture. For them, the series of impacts from other civilizations have dissolved each equivalent individual elements for their successive culture. The introduction of Portuguese arquebus in the mid 16th century was a monumental event of Japanese technological development based on military initiatives. In terms of the Japanese import of western civilization from the time onward, the Meiji restoration could be explained the extension of the process modernization. Modern Japanese design is a unique case created through the close relationship between industry and cultural traditions. Such a role of traditional values and an alliance between political decision and economic program in post war years show two-fold implications

• Korean Journal of Optics and Photonics
• /
• v.8 no.2
• /
• pp.107-110
• /
• 1997

We generated a diffraction free beam from Nd:YAG laser with an NBUR (negative branch unstable ring) resonator. The field inside the resonator had a plane wavefront and a homogeneous intensity distribution and the output beam through a scraper mirror of an annular type was used as a source. The outpur beam had an inner radius of 2.5 mm and an outer radius of 5 mm. In this experiment, we used a Fourier transformation lens with the focal length of 5 m to observe the far-field pattern. The lens was placed at a distance of the focal length from the scraper mirror and we found that the beam did not show any noticable diffraction over the distance of 13 m from the lens.

• Economic and Environmental Geology
• /
• v.13 no.1
• /
• pp.51-63
• /
• 1980

The seismicity of the Korean Peninsula and its vicinity is investigated temporally (2 A. D. to 1978) and spatially to evaluate the seismic risk and to understand the neotectonics around the peninsula. The study has been conducted using macrocosmic data obtained from historical literature, and instrumental records recorded by the Worldwide Network of Standardized Seismographs(WWNSS). The seismicity of the peninsula was active from the 13th through the 17th centuries. A seismic quiescence began at the onset of the 18th century, and has continued for the last 200 years. Presently, the seismicity region is found to be active again. The return periods are determined by a statistical method based upon the cumulative magnitude recurrence. They indicate that the seismic risk is greater in the south or west than in the north or east of the peninsula. Focal mechanism solutions demonstrate that the neotectonic stress distribution in the Japan Sea is greatly influenced by the subduction of the Pacific Plate under the Eurasian Plate or the Philippine Sea Plate, even though the predominate local paleotectonics is controlled by the spreading of the earth's crut.

• Korean Journal of Heritage: History & Science
• /
• v.52 no.2
• /
• pp.122-141
• /
• 2019

This study aimed to provide new interpretations of the ceramics excavated from the archaeological site of the royal palace of Goryeo (918~1392), where only limited access was permitted due to its location in Gaeseong, North Korea. The interpretations were based on the existing understanding of the arrangement of the palace buildings at the site and historical records. The study of the general aspects of the celadons discovered during eight excavations at the Goryeo Palace site in Gaeseong revealed that most of the vessels found at the site were produced during the early and middle phases of the Goryeo dynasty. The study involved classifying the celadons bearing inscribed texts and symbols into 18 different types according to their characteristic features and periods of production. The inscribed celadons have provided detailed information of the site where they were found, thereby making it possible to make strong presumptions about the date of construction, function, and status of the building in the palace connected with the discoveries. The excavations from the Goryeo Palace site and related historical literature suggest that the celadons bearing the inscription "Sojeon (燒錢)" were used during the first half of the 13th century, although the existing view had been that they were used during the second half of the century. This new conclusion is based on the use of the symbols ${\circ}$ and ${\odot}$, the celadons found together with the Sojeon-inscribed celadons, the date of the celadons bearing the inscription "Seong (成)," and the location of their discovery behind the site of Seongyeongjeon (aka Hoegyeongjeon) Hall, which had been one of the main palace buildings. The Taoist rituals performed for the safety of the Goryeo dynasty were largely held at Ganganjeon (aka Daegwanjeon) Hall in the western part of the royal palace during the second half of the 13th century. It was mostly in the first half of the 13th century just before the transfer of the Goryeo government from Gaeseong to Ganghwa (1232~1270) that the Taoist rituals were held at the location near Seongyeongjeon Hall, where archaeologists found the Sojeon-inscribed celadons. Therefore, the large number of celadon cups with holders, including those inscribed with Sojeon, discovered during the eighth excavation of the palace site suggests that they were used for the rituals held at Seongyeongjeon Hall during the first half of the 13th century.

• Journal of Arbitration Studies
• /
• v.13 no.2
• /
• pp.27-45
• /
• 2004

중국국내중재제도의 형성과 발전은 20세기 80년대 초반으로부터 시작되었습니다. 1983년 국무원에서 <중화인민공화국 경제계약중재조례>를 반포한 뒤, 국가공상행정관리국에서는 <경제계약중재위원회판안규칙>을 제정하였으며, 이에 따라서 지방의 공상행정기관은 중재위원회을 설립하였고 경제계약분쟁을 해결하기 시작하였습니다. (중략)

• Journal of the Korean Vacuum Society
• /
• v.22 no.4
• /
• pp.181-187
• /
• 2013

$Dy^{3+}$-doped $BaMoO_4$ phosphor powders were synthesized by using the solid-state reaction method and their crystalline structure, morphology and size of particles, excitation and emission properties were investigated. The structure of all the phosphor powders, irrespective of the mol ratio of $Dy^{3+}$ ions, was found to be the tetragonal system with the main diffraction peak at (112) plane. The grain particles agglomerate together to form larger clusters with increasing the mol ratio of $Dy^{3+}$ ions. The excitation spectra were composed of a broad band centered at 293 nm and weak multiline peaked in the range of 230~320 nm, which were due to the transitions of $Dy^{3+}$ ions. The emission of the phosphors peaking at 666 and 754 nm, originating from the transitions of $^4F_{9/2}{\rightarrow}^6H_{11/2}$ and $^4F_{9/2}{\rightarrow}^6H_{9/2}$ of $Dy^{3+}$ ions, was rather weak, while the intensity of blue and yellow emission peaking at 486 nm and 577 nm due to the transitions of $^4F_{9/2}{\rightarrow}^6H_{15/2}$ and $^4F_{9/2}{\rightarrow}^6H_{13/2}$ of $Dy^{3+}$ ions was significantly stronger. The experimental results suggest that the white-light emission can be realized by controlling the yellow-to-blue intensity ratio of $Dy^{3+}$ emission.