• 자원ㆍ환경경제연구
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• 제16권3호
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• pp.701-721
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• 2007

진술선호법(stated preference methods)을 이용하는 비시장가치 연구의 핵심과제는 응답자 이질성(heterogeneity)에 대한 대응이라 해도 과언이 아니다. 기존 연구에서 이를 위해 사용되는 두 가지 접근법은 (1) 사회경제변수와 같은 응답자 특성변수를 간접효용함수에 포함시키는 것과 (2) 변수 추정치의 분산을 허용하는 mixed legit이나 probit과 같은 일반화된 모델을 적용하는 것이다. 본 연구에서는 심리태도변수(attitudinal variables)를 특성변수로서 사용하는 세 번째 접근법을 제시하고 검증하였다. 심리태도 변수는 초이스 모델링 연구에서 설명변수와 분할 지표변수(segmentation criteria)로 적용되었다. 연구결과에 의하면 심리태도변수는 모델의 신뢰성과 속성 변수 추정치뿐만이 아니라 지불의사액에도 영향을 주는 것으로 나타났다.

• 한국지역지리학회지
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• 제12권2호
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• pp.265-280
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• 2006

본 연구 목적은 한국과 일본의 문화적 특성이 자국민의 해외여행 행태 및 여행사의 기업전략에 끼친 영향을 밝히는데 있다. 이와 관련하여 본 연구에서는 한국과 일본 관광객의 해외여행 행태, 여행의 진행과정, 여행업의 구조변화, 관광분야 해외직접투자 등에 대해 조사하였다. 한국과 일본의 국제관광에 있어서 뚜렷이 구분되는 특징은 높은 패키지여행 비중, 강한 민족적 연계, 대형 도매여행사 중심의 여행업 구조개편, 해외 현지지사의 설립과 리조트 및 호텔에 대한 해외직접투자 둥으로 요약된다. 호주여행에 있어서 한국과 일본의 이러한 두드러진 특징은 강한 집단의식과 언어 및 음식과 같은 문화적 특성에 의해 영향 받은 것으로 판단된다.

• 자원환경지질
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• 제31권5호
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• pp.399-413
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• 1998

Daegang granite is located around the Namwon-gun, Cheolabuk-do, and is an elongate stock $(80 km^{2})$ in the NNE-SSW direction. Daegang granite has the very same mineralogical and geochemical characteristics as those of the typical A-type granites; (1) it is a one feldspar hypersolvus granite, and is classified as an alkali feldspar granite in the lUGS scheme, (2) has small amounts of Fe-rich biotite (annite) and alkali amphibole (ribeckite) that are late in the crystallization sequence of the granitic magma, (3) always contains opaque oxides, fluorite and zircon, (4) shows high and quite homogeneous $SiO_2$, content (mostly 72~77 wt.%) and $(Na_{2}O+K_{2}O)/Al_{2}O_{3}$ ratio (0.90~0.98), (5) contains high Ga, lOOOO*Ga/Ai, $K_{2}O+Na_{2}O$, $(K_{2}O+Na_{2}O)/CaO$, $K_{2}O/MgO$, FeO/MgO, agpaitic index, Zr, Nb, Ce, Y, Zn value or ratio that resemble to those of the Australian A-type granites (Whalen et al., 1987), and (6) has enriched LREE and HREE that show flat variation pattern with slightly depleted in HREE and profound Eu anomalies (Eu/Eu*=0.04~0.l4). In the tectonic discrimination diagrams of Pearce et al. (1984) and Eby (1992), Daegang granite is classified as a within plate granite and $A_{2}-type$.

• 한국항공우주학회지
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• 제43권3호
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• pp.243-256
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• 2015

극초음속 비행체 개발 연구의 일환으로 소형 발사체나 과학로켓을 이용한 여러 비행 시험 프로그램이 진행되었다. 국제 협력으로 진행된 호주의 HyShot 프로그램은 과학로켓을 이용한 대표적인 스크램제트 엔진 비행시험 프로그램이며, 이후 다양한 탑재체에 대한 유사한 극초음속 비행 시험 프로그램들이 진행되었다. 미국에서는 DARPA와 AFRL 및 ONR이 각각 Falcon HTV-2, X-51A 및 HyFly의 프로그램을 수행하였으며, 호주와 국제협력으로 HyCAUSE, HIFiRE 비행시험 프로그램을 수행하였다. 그 밖에도 프랑스는 X-51A과 유사한 LEA 프로그램을 진행하고 있으며, 러시아 및 중국, 인도는 극초음속 방위 체계 개발을 목표로 비행시험을 진행하고 있는 것으로 보인다. 본 논문에서는 향후 국내에서 유사 프로그램을 수행할 시 참고할 수 있도록, 이들 프로그램의 목표 및 기술 요소와 경과 및 프로그램 사이의 관계 등을 정리하였다.

• 화약ㆍ발파
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• 제38권1호
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• pp.14-22
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• 2020

천공 중 비트의 손상은 천공 효율을 떨어뜨리는 주요 원인이다. 현재 천공 중 비트의 마모와 손상에 대한 관리는 현장 작업자의 기술에 의지하고 있어 이를 예측하고 관리하는 시스템의 구축이 시급하다. 비트의 정확한 손상 시점을 판단하기 위해 천공 중 발생하는 소음 자료를 이용해 웨이블릿 변환 분석을 하였다. 이를 통해 얻은 시간-주파수 스펙트럼을 분석한 결과 천공 후 652.8 sec에 주파수 500 Hz 구간에서 웨이블릿 변환 값이 0.9로 최대치가 되는 이상점을 확인하였다. 또한, 천공 속도 분석을 통해 이상치가 발견된 후 천공 속도가 평균인 32 mm/s 보다 9 mm/s 줄어든 것을 확인하였다. 이러한 결과를 통해 웨이블릿 변환 분석을 이용해 천공 중 드릴 비트의 손상을 진단할 수 있음을 보였다.

• 천문학회보
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• 제36권2호
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• pp.152.1-152.1
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• 2011

We report preliminary results of long-slit near-infrared (NIR) spectroscopy of Luminous Blue Variables (LBVs) with moderate resolution of R ~ 2400. We obtained Jshort (1.04-1.26 micron) and Ks (2.02-2.31 micron) band spectra of 4 LBVs and 3 LBV candidates in Southern hemisphere using IRIS2, infrared imager and spectrograph, mounted on the 4-m Anglo-Australian Telescope. All targets are fairly bright in NIR so that we can obtain high signal-to-noise ratio for clear line detection and modeling. They are also widely distributed in the HR diagram so that we can compare the spectral properties of LBVs in different temperature and luminosity ranges. Among them, we present the results of two well-known LBVs AG Car and HR Car. Their spectra show similar properties with hydrogen, He I, and metallic lines such as Fe II and Mg II, most of them in emission. We discuss, in particular, the He I 1.083 micron lines formed in stellar wind because these two LBVs show large variation in their He I line intensities, compared to previous studies. Since the He I 1.083 line is known to be anticorrelated with the photometric variation of LBVs, strong line intensities with P-Cygni profiles in both stars indicate that they are now near the visual minimum phase. We model the obtained spectra using non-LTE atmosphere code CMFGEN of Hillier (1998) to derive stellar parameters such as wind velocity and mass loss rate, and discuss the long-term variability of stellar parameters of these LBVs. deduced from our otometric solution.

• 천문학회보
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• 제36권2호
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• pp.121-121
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• 2011

Thanks to KMTNet's wide field of view, it is time to implement imaging survey of extensive area of clusters of galaxies in the southern sky with modern instrument. As part of potential long-term survey of nearby (D < 50 Mpc) well-known clusters of galaxies, we propose a wide-field and deep survey of Fornax cluster as a first step of the project. By imaging the 400 square deg region (100 fields) enclosed within the five times virial radius of the Fornax cluster, in three SDSSfilters(g', r', i'), we can provide an unprecedented view of structure of Fornax cluster using sample from giant to dwarf galaxies. We will secure galaxies with brightness comparable to the limiting magnitude (r'=23.1 AB mag) of SDSS. Furthermore, we also request extremely deep (limiting surface brightness of ~ 28 mag $arcsec^{-2}$forr'band) survey for the central region (16 square degree, i.e., four fields) of Fornax cluster. This will allow us to detect the diffuse intracluster light (ICL) that permeates clusters as a valuable tool for studying the hierarchical nature of cluster assembly. In order to complete whole survey, about 285 hr observing time (without overhead) is required. By combining data available at other wavelengths, it will offer unique constraints on the formation of large-scale structure and also provide important clues for theories of galaxy formation and evolution. Our proposed survey will be implemented in the close collaboration with researchers in various countries (Germany, Australia, UK, USA) and ongoing project (e.g., SkyMapper).

• 천문학회보
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• 제36권2호
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• pp.104.1-104.1
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• 2011

We present a catalog of infrared supernova remnants (SNRs) in the Large Magellanic Cloud (LMC). We have searched the Spitzer archival data for infrared counterparts to all 45 known SNRs in the LMC, and identified 21 which is 47% of the known SNRs. Seven of them are newly detected: SNR 0450-70.9, SNR in N4, N103B, DEM L241, DEM L249, DEM L316A, and DEM L316B. All newly discovered SNRs show emission at several IRAC 3.4, 4.5, 5.8, and 8.0 micron bands and/or MIPS 24 and 70 micron bands. Most SNRs show shell structures. We derive infrared fluxes of these newly detected SNRs. The catalog contains general information of each SNR such as location, age, and SN type together with AKARI and/or Spitzer fluxes. For the entire SNR sample, we examine their infrared colors and the possible correlation of the infrared fluxes with the fluxes at other wavelengths. For the newly detected SNRs except the SNR in N4, we also performed follow-up imaging observations of [Fe II] 1.644 micron line using IRIS2 mounted on the Anglo Australian Telescope. Three out of six SNRs show [Fe II] emission corresponding to their infrared shells. [Fe II] knots are also detected in N103B which show good spatial correlation to infrared emission seen at Spitzer images as well as knotty $H{\alpha}$ emission. We investigate the characteristics and origin of the infrared emission in individual SNRs, and discuss the environmental and evolutionary effects.

• 천문학회보
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• 제36권2호
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• pp.69.1-69.1
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• 2011

While the Virgo Cluster Catalog (VCC) is well established catalog from deep photographic plate survey, with available survey data recently released (e.g., SDSS), it can be further updated concerning the membership and morphology of galaxies. While membership and morphology of galaxies included in the VCC are based on the single band imaging data, thanks to the multi-color imaging and spectroscopic observations of SDSS, we are able to revise the membership and morphology of sample galaxies in the fields of the Virgo cluster. We present a new catalog of galaxies in the Virgo cluster using SDSS DR7 data, the extended Virgo cluster catalog. Using SDSS imaging and spectroscopic data, we introduce two kinds of galaxy classifications which are complementary each other. In addition to traditional morphological classification by visual inspection of the images ("Primary Classification"), we also attempt to classify galaxies with the spectroscopic features ("Secondary Classification"). The primary classification is basically based on the scheme of galaxy morphological classification of VCC. The secondary classification relies on the SED shape and presence of emission/absorption lines returned from SDSS. Our morphological classifications allow to study the evolution and associated star formation histories of galaxies in the Virgo cluster.

• Safety and Health at Work
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• 제4권2호
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• pp.117-121
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• 2013

This paper describes progress on formulating a national asbestos profile for the country of Vietnam. The Center of Asbestos Resource, Vietnam, formulated a National Profile on Asbestos-related Occupational Health, with due reference to the International Labor Organization/World Health Organization National Asbestos Profile. The Center of Asbestos Resource was established by the Vietnamese Health Environment Management Agency and the National Institute of Labor Protection, with the support of the Australian Agency for International Development, as a coordinating point for asbestos-related issues in Vietnam. Under the National Profile on Asbestos-related Occupational Health framework, the Center of Asbestos Resource succeeded in compiling relevant information for 15 of the 18 designated items outlined in the International Labor Organization/World Health Organization National Asbestos Profile, some overlaps of the information items notwithstanding. Today, Vietnam continues to import and use an average of more than 60,000 metric tons of raw asbestos per year. Information on asbestos-related diseases is limited, but the country has begun to diagnose mesothelioma cases, with the technical cooperation of Japan. As it stands, the National Profile on Asbestos-related Occupational Health needs further work and updating. However, we envisage that the National Profile on Asbestos-related Occupational Health will ultimately facilitate the smooth transition to an asbestos-free Vietnam.