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A Comparison Study on Near-surface High-resolution Seismic Data by Different Source and Geophone Types (진원과 수진기별 천부 고해상도 탄성파 자료 비교 연구)

  • Kim, Hyoung-Soo;Keehm, Young-Seuk
    • Journal of the Korean earth science society
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    • v.32 no.6
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    • pp.674-686
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    • 2011
  • Choosing a seismic source and geophone type including a coupling method can be the most important factor in shallow seismic surveys. We studied the characteristics of seismic signals by analyzing 6 different seismic data sets that collected from several sources and geophone conditions. Geophones attached to weight plate (1.8 kg) can be easily and economically installed on the paved road where geophones with spikes would cause the coupling problem. In addition, experiments in this study revealed that a small handy hammer can be used as a seismic source by striking the paved road to generate the seismic signals within 200 ms two-way travel time. Attaching weight plates to geophones may change the geophone response curve which generally depends on the geophone mass, but the change seems not to give significant differences in the first arrival of refracted wave and in the pattern of reflection events. Consequently, using weight plates on paved roads can be an efficient and cost-saving method in the near-surface high-resolution seismic surveys.

Observation of the Cosmic Near-Infrared Background with the CIBER rocket

  • Kim, Min-Gyu;Matsumoto, T.;Lee, Hyung-Mok;Arai, T.;Battle, J.;Bock, J.;Brown, S.;Cooray, A.;Hristov, V.;Keating, B.;Korngut, P.;Lee, Dae-Hee;Levenson, L.R.;Lykke, K.;Mason, P.;Matsuura, S.;Nam, U.W.;Renbarger, T.;Smith, A.;Sullivan, I.;Wada, T.;Zemcov, M.
    • The Bulletin of The Korean Astronomical Society
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    • v.37 no.1
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    • pp.42-42
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    • 2012
  • The First stars (Pop.III stars) in the universe are expected to be formed between the recombination era at z - 1100 and the most distant quasar (z - 8). They have never been directly detected due to its faintness so far, but can be observed as a background radiation at around 1${\mu}m$ which is called the Cosmic Near-Infrared Background (CNB). Main part of the CNB is thought to be redshifted Lyman-alpha from gas clouds surrounding the Pop.III stars. Until now, the COBE (COsmic Background Explorer) and the IRTS (Infrared Telescope in Space) observed excess emission over the background due to galaxies. To confirm the COBE and the IRTS results and pursue more observational evidences, we carried out the sounding rocket experiment named the Cosmic Infrared Background ExpeRiment (CIBER). The CIBER is successfully launched on July 10, 2010 at White Sands Missile Range, New Mexico, USA. It consists of three kinds of instruments. We report the results obtained by LRS (Low Resolution Spectrometer) which is developed to fill the uncovered spectrum around 1${\mu}m$. LRS is a refractive telescope of 5.5 cm aperture with spectral resolution of 20 - 30 and wavelength coverage of 0.7 to 2.0${\mu}m$. After subtracting foreground components (zodiacal light, integrated star light and diffuse galactic light) from the sky brightness of observed five fields, there remained significant residual emission (even for the lower limit case) consistent with the IRTS and the COBE results. In addition, there exists a clear gap at 0.7 - 0.8${\mu}m$ in the CNB spectrum over the background due to galaxies according to recent results (Matsuoka et al. 2011; Mattila et al. 2011). The origin of the excess emission could be ascribed to the Pop.III stars with its active era of z = 7 - 10.

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A Study on in Influence on the Memory-Based Judgement and Purchase Intention upon Temporal Distance and Prior Kowledge in Preannouncing Strategy (시간적 거리와 사전지식에 따른 프리어나운싱 전략이 기억에 근거한 판단과 구매의도에 미치는 효과)

  • Han, Kwang-Seok
    • Management & Information Systems Review
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    • v.33 no.1
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    • pp.99-118
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    • 2014
  • This study is a product launch strategy Preannouncing companies associated with temporal distance( in the near future/ distant future) and prior knowledge level(high knowledge/ low knowledge), the memory - based judgments(Global product judgment/ Discrete product judgment) and the purchase intention appears, the difference between the empirical verification of what was discriminatory. The study, first, Preannouncing main effect of temporal distance on judgments remember the difference between the purchase intention and consistent global product judgment is more discrete product judgment were higher awareness, purchase intention is higher. Second, Preannouncing high level of product knowledge in global product judgment showed that compared to discrete product judgment. In addition, low levels of knowledge than a discrete product judgment that global product judgment and purchase intention shown that a high level of consumer knowledge through systematic information processing and the road leads to higher purchase attitude. Third, Preannouncing according to the temporal distance and level of knowledge about the interaction effect results in the near future in terms of the high level of knowledge consumers global product judgment was higher than the discrete product judgment. On the other hand, a low level of knowledge of conditions in the distant future, consumers are more discrete product judgment recognized global product judgment showed that high.

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A Study on the Feasibility of Geomagnetic Declination Investigation at Unified Control Points in South Korea (국내 통합기준점에서 지자기 편각 조사의 타당성 연구)

  • Lee, Yong Chang
    • Journal of Korean Society for Geospatial Information Science
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    • v.24 no.3
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    • pp.29-38
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    • 2016
  • As publicizing of electromagnetic devices such as smart_phone and drone etc. which are relate with geomagnetic direction, and recognition about the importance to space weather effect and their hazards rises up recently, it is required heavily that the study on the effective measurement of geomagnetic declination and geomagnetic field effects of space weather. The purpose of this study is that the investigation of the feasibility of the absolute geomagnetic measurement in a place, where man-made geomagnetic contamination is low or negligible, with replacing the azimuth marks used for the absolute geomagnetic declination measurement with unified control points(UCP) which established at suburb. Further to this, have first derived the correlation of daily variations and disturbance level between the published indices($K_P$ and $K_K$) and geomagnetic element calculated from geomagnetic data of Cheongyang observatory located at the middle stage in Korea and is a member of INTERMAGNET. In addition, have carried out that the absolute measurement for the geomagnetic declination at three places near unified control point and one place with wide open field in Korea. The world magnetic models(WMMs) are selected as the criteria for comparison on the feasibility of geomagnetic declination investigation near unified control points. We compared deviations of declination from absolute measurement with that obtained from WMMs, also those from WMMs inter-comparison. The result through examination and analysis show that the feasibility of the absolute geomagnetic declination measurement with replacing the azimuth marks with UCP which established at suburb is possible.

Extragalactic Sciences from SPICA/FPC-S

  • Jeong, Woong-Seob;Matsumoto, Toshio;Im, Myungshin;Lee, Hyung Mok;Lee, Jeong-Eun;Tsumura, Kohji;Tanaka, Masayuki;Shimonishi, Takashi;Lee, Dae-Hee;Pyo, Jeonghyun;Park, Sung-Joon;Moon, Bongkon;Park, Kwijong;Park, Youngsik;Han, Wonyong;Nam, Ukwon
    • The Bulletin of The Korean Astronomical Society
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    • v.38 no.1
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    • pp.36.2-36.2
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    • 2013
  • The SPICA (SPace Infrared Telescope for Cosmology & Astrophysics) project is a next-generation infrared space telescope optimized for mid- and far-infrared observation with a cryogenically cooled 3m-class telescope. The focal plane instruments onboard SPICA will enable us to resolve many astronomical key issues from the formation and evolution of galaxies to the planetary formation. The FPC-S (Focal Plane Camera - Sciecne) is a near-infrared instrument proposed by Korea as an international collaboration. Owing to the capability of both low-resolution imaging spectroscopy and wide-band imaging with a field of view of $5^{\prime}{\times}5^{\prime}$, it has large throughput as well as high sensitivity for diffuse light compared with JWST. In order to strengthen advantages of the FPC-S, we propose the studies of probing population III stars by the measurement of cosmic near-infrared background radiation and the star formation history at high redshift by the discoveries of active star-forming galaxies. In addition to the major scientific targets, to survey large area opens a new parameter space to investigate the deep Universe. The good survey capability in the parallel imaging mode allows us to study the rare, bright objects such as quasars, bright star-forming galaxies in the early Universe as a way to understand the formation of the first objects in the Universe, and ultra-cool brown dwarfs. Observations in the warm mission will give us a unique chance to detect high-z supernovae, ices in young stellar objects (YSOs) even with low mass, the $3.3{\mu}$ feature of shocked circumstance in supernova remnants. Here, we report the current status of SPICA/FPC project and its extragalactic sciences.

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A Study on the Characteristics of Humanistic Landscape in Pyongyang Castle through Pictorial Maps in the Late Joseon Dynasty (조선후기 회화식 고지도를 통해 본 평양성의 인문경관 특성)

  • Kim, Mi-Jung;So, Hyun-Su
    • Journal of the Korean Institute of Traditional Landscape Architecture
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    • v.38 no.2
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    • pp.14-30
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    • 2020
  • This study focuses on the fact that pictorial maps in the late Joseon Dynasty were conceptual diagrams with the place names perceived by the people at the time of their production. In this regard, targeting on five pictorial maps, the humanistic landscape characteristics of Pyongyang, which had cultural identities such as a historically old, commercial, and Pungnyu(appreciation for the arts) city, were derived as follows. First, the historic legitimacy of Pyongyang Castle was represented by ritual and religious facilities. They include 'Dangunjeon' and 'Gijagung' related to the nation founder, 'Munmujeong': the remains of Goguryeo, 'Sajikdan' & 'Pyongyanggangdan': the place of the national rites, Hyanggyo and Seowon: education & rite functions, Buddhism and Taoist facilities, 'Yongsindang', 'Sanshindang', and 'Jesindan': folk religion facilities. Gija-related facilities, which became symbols of Pyongyang due to the importance of Small-Sinocentrism and Gija dignity tendency, were distributed throughout Pyongyang Castle though, the facilities related to King Dongmyeong of Goguryeo and the spaces of religion praying for blessings are spread in Bukseong and on the riverside of Daedonggang each. Second, as a Pyongando Province's economic center, Pyongyang's commercial landscape was represented by logistics and transportation facilities. The Daedonggang River, which was in charge of transportation functions, had many decks such as 'Yangmyeongpo', 'Cheongryongpo' and 'Waeseongjin' and bridges, such as 'Yeongjegyo' and 'Gangdonggyo', which connected major transportation routes. The road network was created in Oeseong area to facilitate logistics transportation and management, and many warehouses named after the jurisdiction of Pyongyangbu were distributed near the roads and Provincial Offices of the main gates. In addition, it was characterized by the urban area systematically divided with hierarchical roads, 'Bukjangnim' of willow trees planted on the main entrance roads of Pyongyang Castle, a linear landscape created by 'Simnijangnim' consisting of mixed forests with elm trees. Third, Pungnyu City is realized by the distribution of amusement facilities. The riverside of Daedonggang adjacent to Naeseong exhibits characteristics of artificial landscape such as a canal leading to the inside of the castle, a docking facility with embankments, and a port with cargo ships anchored. However, Bukseong of the natural surroundings had numerous pavilions and platforms such as 'Bubyeongnu', 'Eulmildae', 'Choeseungdae', 'Jebyeokjeong' and engraved letters such as 'Cheongnyubyeok', 'Jangbangho'. 'Osunjeong', 'Byeogwolji', 'Banwolji' near 'Sachang', and 'Aeryeondang', built on the island of a square pond, created waterscape in Naeseong invisible from the Daedonggang, and for practical purposes, ponds and repeated willow vegetation landscape related to Gija were placed in the western rampart of Jungseong. In addition, 'Seonyeondong', a cemetery of Gisaeng, located near by Chilseongmun, was used as poem titles and themes by literary people, contributing to the creation of the Pungnyu image of Pyongyang.

The Policy Implications of Port Redevelopment and Urban Regeneration Experiences of Advanced Countries (선진국 항만재개발과 도시재생사업의 경험과 정책적 시사점)

  • Jin, Young Hwan
    • Journal of the Korean Regional Science Association
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    • v.31 no.1
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    • pp.83-101
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    • 2015
  • This paper examines port redevelopment and urban regeneration projects of foreign advanced countries and investigates policy implications to apply to Korean port cities. Busan and Incheon have started to redevelop old port facilities located near old city centers and they have been faced several problems. Significant findings are found from the experiences of Inner Harbor in Baltimore, Darling Harbor in Sydney, Hafencity in Hamburg, Eastern Dockland in Amsterdam and Minatomirai 21 in Yokohama etc. At first, port and city have to be integrated to an unique regeneration project in order to solve the spatially disconnected problems originated from separate development in the initial stage. Preservation of historical regional assets is highly recommended to characterize its own value which is emphasized in the age of post modernism. Accurate and consistent design guidelines of port cities are stressed to build high standard cities. In the perspective of investigating a new business model, anchor facilities and place marketing strategies are introduced to induce more people to the place specially in the beginning stage. In addition, creative financing methods and competent implementing bodies are emphasized to running the projects stably regardless of real estate market status.

Research on Conceptual Designs and Basic Plans of Korea Land Spatialization Program's Proving Ground (지능형국토정보 공동실험장 기초설계 연구)

  • Park, Jae-Min;Jung, Yeun-J.;Park, Dong-Youn;Park, Kwan-Dong;Kim, Byung-Guk
    • Journal of Korea Spatial Information System Society
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    • v.11 no.1
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    • pp.169-176
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    • 2009
  • Korean Land Spatialization Program(KLSP) is the R&D program of the National GIS Project for developing ubiquitous GIS core technologies under control of Ministry of Land, Transport and Maritime Affairs(MLTM). The first program of KLSP, from 2006 to 2012, initiated with $132 million (US dollars) of national fund and $42 million of matching fund. KLPS which aims 'Innovation of the GIS technology for the ubiquitous Korean land' consists of 5 core research projects and 1 research coordination project to practically utilize and commercialize the results of core research. Korean Land Spatialization Group(KLSG) is planning the KLSP proving ground for testing, integrating, exhibiting the KLSP's outcomes. In the near future, this proving ground would be utilized as a national ubiquitous GIS proving ground. The key objective of this paper is to present the conceptual designs and basic plans. In addition, this paper discusses characteristics of the outcomes which are applied to KLSP proving ground.

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A Study of Space Composition and Usage Pattern of Shared Living Facilities for the Solitary Elderly - Based on the Six Carnation Houses in Gyeounggi Province - (독거노인을 위한 공동생활시설의 공간구성과 이용실태연구 - 경기도 지역의 카네이션하우스 6개 시설을 중심으로 -)

  • Moon, Ja-Young;Shin, Kyung-Joo
    • Korean Institute of Interior Design Journal
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    • v.24 no.1
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    • pp.34-42
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    • 2015
  • This research is about shared living facilities for the solitary elderly in Gyeonggi province (so called "Carnation House"), which was opened after 2013. These facilities aim to help solving the social problems of the growing number of the solitary elderly. The research was conducted from April 2014 to October 2014 by using observation, measurement, photography, and interview methods. This research reviewed floor plan, area, accessibility, visual openness, and furniture and equipments. The results are as follows: First, considering the need for rest area and the protection of privacy, livingroom should at least be equipped with a variable wall or have a separate room. Secondly, for the kitchen plan, considering the fact that large number of people move simultaneously, kitchen entrance should be widened or LDK type is preferable. Thirdly, the bathroom entrance should be widened to at least 800mm and should have barrier free design. Fourthly, porch entrance should be planned to secure enough space and shoe cabinets for multiple users. Fifthly, to allow the users to enjoy outside view, the windows of living spaces should be placed no higher than 800mm from the floor level. Finally, for the location of the facility, people prefer the location be at the center of the village or near home. In addition, location with easy accessibility for the elderly is advisable. Therefore, establishing local guidelines for shared living facilities for the solitary elderly is advisable. When establishing local guidelines, local characters, culture and usage patterns should be considered.

Effect of Thermal Aging on Electrical Properties of Low Density Polyethylene

  • Wang, Can;Xie, Yaoheng;Pan, Hua;Wang, Youyuan
    • Journal of Electrical Engineering and Technology
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    • v.13 no.6
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    • pp.2412-2420
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    • 2018
  • The thermal degradation of low density polyethylene (LDPE) will accelerate the production of carbonyl groups (C=O), which can act as the induced dipoles under high voltage. In this paper, we researched the dielectric properties and space charge behavior of LDPE after thermal aging, which can help us to understand the correlation between carbonyl groups (C=O) and electrical properties of LDPE. The spectra results show that LDPE exhibit obvious thermooxidative reactions when the aging time is 35 days and the productions mainly contain carboxylic acid, carboxylic eater and carboxylic anhydride, whose amount increase with the increasing of aging time. The dielectric properties show that the real permittivity of LDPE is inversely proportional to temperature before aging and subsequently become proportional to temperature after thermal aging. Furthermore, both the real and imaginary permittivity increase sharply with the increasing of aging time. The fitting results of imaginary permittivity show that DC conductivity become more sensitive about temperature after thermal aging. On this basis, the active energies of materials calculated from DC conductivity increase first and then decrease with the increasing of aging time. In addition, the space charge results show that the heterocharges accumulated near electrodes in LDPE change to the homocharges after thermal aging and the mean volume charge density increase with the increasing of aging time. It is considered that the overlaps caused by electrical potential area is the main reason for the increase of DC conductivity.