• 제목/요약/키워드: habitability

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외계행성과 생명가능성 (EXOPLANETS AND HABITABILITY)

  • Sungwook E. Hong;Ryun-Young Kwon;Yunjong Kim;Hyunwoo Kang;Minsun Kim
    • 천문학논총
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    • 제38권2호
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    • pp.13-24
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    • 2023
  • More than 5,000 exoplanets have been detected nowadays. One of the key motivations of exoplanet detection is to understand what physical/chemical conditions of exoplanets are suitable for harboring extraterrestrial life. Such conditions are called "habitability," and most modern studies assume the existence of liquid water as its key factor. In this paper, we review the current status of exoplanet and habitability studies, as well as some future (habitable) exoplanet survey plans, mostly from National Academies of Sciences, Engineering, and Medicine (2018, 2021). Also, we suggest several research items that the Korean astronomy and space science community could contribute to habitability.

Case Study on Habitability of Superstructure built on Floating Structure

  • Maruyoshi Koichi;Cho Yong-Soo;Song Hwa-Cheol;Saijo Osamu
    • 한국항해항만학회지
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    • 제30권2호
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    • pp.131-136
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    • 2006
  • Researches on a superstructure built on a floating structure in the shape of pontoon type have begun in recent years. A superstructure responds by wave load and it is important to evaluate its habitability. The purpose of this study is evaluation and investigation of habitability of a superstructure due to wave for 10 year return period. In this study, response analyses of the superstructure built on middle-sized floating structure due to the waves of three cases were carried out by 3-D integration analysis, which means analyzing the calculation model integrated a superstructure with a floating structure, and its habitability was evaluated by the evaluation diagrams. As the result, the habitability differed by each wave condition The use of a superstructure is restricted according to the disposition of a floating structure for incident wave angle.

사용자의 거주성을 고려한 이재민 임시주거시설 현황 분석과 계획적 시사점 (Current Status and Implication for the Planning of Emergency Shelter Considering Users' Habitability)

  • 김미경;김은정
    • 한국실내디자인학회논문집
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    • 제25권6호
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    • pp.23-31
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    • 2016
  • The study aims to identify the existing problems and suggests the implication for the planning of emergency shelter in terms of users' habitability. The results of the study show that the concept of shelters for disaster victims need to set up and be distinctively defined as emergency phase and temporary residency phase. In emergency phase, the various types of buildings and facilities should be considered as temporary shelters for disaster victims such as transitional shelters including the public facilities. Based on the results of the critical review, this research proposed an analytic framework emphasizing habitability for disaster victims including vulnerable people such as the disabled, the aged, women and children. The framework is composed of four dimensions: safety, health, convenience and comfortability. The manual guidelines for emergency shelters should reflect the barrier-free design or universal design for various types of disaster victims considering habitability to provide the positive opportunity and future hope for restoration after disaster. This research can be a basis for the planning and application of temporary shelters for disaster victims.

Evolution of Galaxy Habitability

  • Hong, Sungwook E.;Gobat, Raphael
    • 천문학회보
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    • 제41권2호
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    • pp.53.3-54
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    • 2016
  • We combine a semi-analytic model of galaxy evolution with constraints on circumstellar habitable zones and the distribution of terrestrial planets in order to probe the suitability of galaxies of different mass and type to host habitable planets, and how it evolves with time. We find that the fraction of stars with terrestrial planets in their habitable zone (known as habitability) depends only weakly on galaxy mass, with a maximum around $4{\times}10^{10}M_{\odot}$. We estimate that 0.7% of all stars in Milky Way-type galaxies to host a terrestrial planet within their habitable zone, consistent with the value derived from Kepler observations. On the other hand, the habitability of passive galaxies is slightly but systematically higher, unless we assume an unrealistically high sensitivity of planets to supernovae. We find that the overall habitability of galaxies has not changed significantly in the last ~8 Gyr, with most of the habitable planets in local disk galaxies having formed ~1.5 Gyr before our own solar system. Finally, we expect that ${\sim}1.4{\times}10^9$ planets similar to present-day Earth have existed so far in our galaxy.

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함승조원의 거주성 향상을 위한 함정 환경진동규격 분석연구 (A Study on the Standard of Navy Vessel's Environmental Vibration for Improvement of the Habitability of Crew)

  • 박미유;조흥기;한형석;이경현
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2011년도 추계학술대회 논문집
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    • pp.803-808
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    • 2011
  • The shipboard working environment of navy vessel is very inferior to the ground working environment. For this reason, the crew of a navy vessel suffer from an occupational disease such as lumbar pain, hearing loss, etc. Although standard for navy vessel's environmental vibration is applied, the criterion of the environmental vibration is too high. So it doesn't help to improve habitability of crew. In this study, for improving its habitability of crew, the current vibration level of navy vessel was examined and the standard of navy vessel's environmental vibration was investigated.

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선박 거주구 진동(ISO6954:2000)의 평가 방법에 대한 고찰 (An Investigation on the Assessment Method of Ship's Vibration Concerning Habitability(ISO6954:2000))

  • 김준성;김태언;이일오;이돈출
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2011년도 춘계학술대회 논문집
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    • pp.772-778
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    • 2011
  • ISO6954:2000 (Mechanical vibration - Guidelines for the measurement, reporting and evaluation of vibration with regard to habitability on passenger and merchant ships) has taken effect as the governing body for vibration regarding habitability due to ship vibration. However, ISO6954:2000, when compared ISO6954:1984 (the first draft of ISO6954), needs to clear some deficiencies concerning convenience and reliability during field applications. In this paper, ISO6954:1984 and 2000 are evaluated on their suggested assessment method of ship's vibration in the future.

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함승조원의 거주성 향상을 위한 함정 환경진동기준 분석고찰 (A Study on the Standard of Navy Vessel's Environmental Vibration for Improvement of the Habitability of Crew)

  • 박미유;조흥기;한형석;이경현
    • 한국소음진동공학회논문집
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    • 제22권2호
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    • pp.139-145
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    • 2012
  • The shipboard working environment of navy vessel is very inferior to the ground working environment. For this reason, the crew of a navy vessel suffer from an occupational disease such as lumbar pain, hearing loss, etc. Although standard for navy vessel's environmental vibration is applied, the criterion of the environmental vibration is too high. So it doesn't help to improve habitability of crew. In this study, for improving its habitability of crew, the current vibration level of navy vessel was examined and the standard of navy vessel's environmental vibration was investigated.

민감도 분석을 이용한 원전 주제어실의 케비닛 화재에 대한 거주성 평가 (Assessment of the Habitability for a Cabinet Fire in the Main Control Room of Nuclear Power Plant using Sensitivity Analysis)

  • 한호식;이재오;황철홍;김주성;이상규
    • 한국화재소방학회논문지
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    • 제31권2호
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    • pp.52-60
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    • 2017
  • NUREG-1934에서 제시된 원자력발전소 주제어실의 케비닛 화재를 대상으로 운전원의 거주성을 평가하기 위하여 수치해석이 수행되었다. 이를 위해 본 연구에서는 대표적인 화재모델인 FDS가 사용되었다. 운전원의 거주성을 결정하는 기준으로서 복사 열유속, 상층부 온도, 연층높이 및 연기의 광학밀도뿐만 아니라, CO 등과 같은 독성물질의 농도가 포함되었다. 주요 결과로서, 화재모델의 확인 및 검증(V&V) 기반의 주요 입력인자 민감도 및 모델 불확실도 분석을 통해 다양한 화재시나리오에 대하여 거주성 기준의 초과 확률 및 거주 가능시간이 산출되었다. 최대 열방출률, CO 및 Soot yields의 민감도 분석을 통해, 거주시간 뿐만 아니라 거주성을 결정하는 한계기준의 변화가 발생됨을 확인하였다. 이러한 방법론은 불확실한 케비닛 화재정보를 이용한 주제어실의 거주성 평가의 신뢰성 강화를 위한 현실적인 대안이라 판단된다.

거주성지표에 따른 아파트와 오피스텔 거주자의 거주후 평가 비교연구 (A Comparative Study on Post-Occupancy-Evaluation (POE) of Apartment and Officetel Based on Habitability Indicators)

  • 정승우;박지연;강부성
    • 한국주거학회논문집
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    • 제24권2호
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    • pp.53-60
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    • 2013
  • Recently, in Korea, single- or two-person households (50.5%) are becoming the primary family type due to increasing divorce rates, population aging, personal code of values and so on. Hence, small families will lead to a sudden increase of single- or two-person households. People searching for small houses are increasing because of the provision of officetels, one room and urban-life housing as well as economic recession. However, this has led to habitability problems, such as parking, storage space and decline in safety. In this study, we obtain the proper contents from LQI indicators of advanced research and use the indicators to evaluate the residential environment quality. We conduct a post-occupancy-evaluation (POE) survey and compare the habitability satisfaction level of apartment and officetel residents. According to the survey, officetel residents' satisfaction levels are low for the following factors in the order listed: ventilation, storage space, management expenses and facilities for children and the elderly.

거주성 관점의 미국 이재민 임시대피시설 공간계획 관련 지침분석 (Analysis of the Space Planning Guidance about the Temporary Shelter Emphasizing Habitability for Disaster Victims in U.S.)

  • 김미경;최선미;최유라
    • 한국실내디자인학회논문집
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    • 제26권5호
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    • pp.42-51
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    • 2017
  • The purpose of this study was to analyze the information about the disaster temporary shelter space planning guidance described in the U.S. shelter guidelines in terms of the habitability for disaster victims and to address the implications and potential impacts of its findings for the improvement of the shelter design standards and guidelines in Korea. The researchers reviewed four federal and non-governmental organization shelter field and design guidelines and attributes regarding the shelter space planning were classified in accordance with four habitability categories: Safety, Health, Convenience, and Comfort. Three major findings emerged from this study: 1)A total of 72 items about the shelter space planning were extracted from guidelines, and the majority of items are concerned with dormitory areas and sanitary spaces. Other items were about accessibility, children respite care area, signage, health service areas, food preparation and serving areas, parking and drop-off areas, registration and waiting areas, shelter manager and staff areas, lounge and storage areas, and household pets area. 2)Most of these items are strongly related to the convenience category(66.7%), followed by comfort(40.3%), safety(30.6%), and health(25.0%). 3)The habitability of the disaster temporary shelter can be established with considerations on the needs of disaster victims and vulnerable people, minimum occupancy space per person, separate sanitary spaces for the privacy, safe and convenient access routes to the shelter, and the provision of children areas for safety and comfort. The study findings will contribute to the development of the disaster shelter guidelines in Korea by suggesting shelter space planning indicators related to the habitability for the governmental and non-governmental organizations' immediate and systematic responses to the disaster.