• 제목/요약/키워드: change in the classification over time

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UAV 영상과 SfM 기술을 이용한 가로수의 탄소저장량 추정 (Estimation Carbon Storage of Urban Street trees Using UAV Imagery and SfM Technique)

  • 김다슬;이동근;허한결
    • 한국환경복원기술학회지
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    • 제22권6호
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    • pp.1-14
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    • 2019
  • Carbon storage is one of the regulating ecosystem services provided by urban street trees. It is important that evaluating the economic value of ecosystem services accurately. The carbon storage of street trees was calculated by measuring the morphological parameter on the field. As the method is labor-intensive and time-consuming for the macro-scale research, remote sensing has been more widely used. The airborne Light Detection And Ranging (LiDAR) is used in obtaining the point clouds data of a densely planted area and extracting individual trees for the carbon storage estimation. However, the LiDAR has limitations such as high cost and complicated operations. In addition, trees change over time they need to be frequently. Therefore, Structure from Motion (SfM) photogrammetry with unmanned Aerial Vehicle (UAV) is a more suitable method for obtaining point clouds data. In this paper, a UAV loaded with a digital camera was employed to take oblique aerial images for generating point cloud of street trees. We extracted the diameter of breast height (DBH) from generated point cloud data to calculate the carbon storage. We compared DBH calculated from UAV data and measured data from the field in the selected area. The calculated DBH was used to estimate the carbon storage of street trees in the study area using a regression model. The results demonstrate the feasibility and effectiveness of applying UAV imagery and SfM technique to the carbon storage estimation of street trees. The technique can contribute to efficiently building inventories of the carbon storage of street trees in urban areas.

RS/GIS를 이용한 토지이용변화에 의한 녹지의 이산화탄소 (CO2) 흡착량 분포 추정 (Estimation of Carbon Absorption Distribution by Land Use Changes using RS/GIS Method in Green Land)

  • 나상일;박종화;박진기
    • 한국농공학회논문집
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    • 제52권3호
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    • pp.39-45
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    • 2010
  • Quantification of carbon absorption and understanding the human induced land use changes (LUC) forms one of the major study with respect to global climatic changes. An attempt study has been made to quantify the carbon absorption by LUC through remote sensing technology. The Landsat imagery four time periods was classified with the hybrid classification method in order to quantify carbon absorption by LUC. Thereafter, for estimating the amount of carbon absorption, the stand biomass of forest was estimated with the total weight, which was the sum of individual tree weight. Individual tree volumes could be estimated with the crown width extracted from digital forest cover type map. In particular, the carbon conversion index and the ratio of the $CO_2$ molecular weight to the C atomic weight, reported in the IPCC guideline, was used to convert the stand biomass into the amount of carbon absorption. Total carbon absorption has been modeled by taking areal estimates of LUC of four time periods and carbon factors for land use type and standing biomass. Results of this study, through LUC suggests that over a period of construction, 7.10 % of forest and 9.43 % of barren were converted into urban. In the conversion process, there has been a loss of 6.66 t/ha/y (7.94 %) of carbon absorption from the study area.

Landsat 7 TM/ETM+ 위성영상을 이용한 군산지역 지표 온도와 NDVI에 대한 상관분석 (A Correlation Analysis between Land Surface Temperature and NDVI in Kunsan City using Landsat 7 TM/ETM+ Satellite Images)

  • 이홍로;김형무
    • 한국지리정보학회지
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    • 제8권2호
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    • pp.31-43
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    • 2005
  • 황해연안 전라북도 군산시 지역의 15년 동안의 4개 시점을 선택하여 육상도시 변화탐지를 목적으로 지표온도와 NDVI를 비교 관찰하고 NDVI최저대-지표온도최고대 상관관계를 분석하였다. 위성영상은 장기간에 걸친 광역지역의 연속모니터링에 효과적이므로 군산시를 촬영한 Landsat-5 TM과 Landsat-7 ETM+인공위성 영상을 분석대상으로 하였으며 에러보정을 위한 승인된 "gain", "bias" 또는 "offset"의 임계치를 대입하여 TM과 ETM+영상간의 오차를 정량화하고 분류하여 비교 검정하였다. 본 연구는 Landsat-5 TM과 Landsat-7 ETM+인공위성 영상을 전북 군산시 도시변화탐지에 적용하고 지표온도, 토지피복, 식생 변수를 검증하여 지표온도와 NDVI식생지수와의 R=(+)0.9478의 강한 양의 상관관계를 검출함으로써 제안한 위성영상을 이용한 NDVI최저대-지표온도최고대 상관분석모델이 육상 도시변화탐지에 매우 효과적임을 입증할 수 있다.

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DDC 지역구분표의 변천과정

  • 이창수
    • 한국도서관정보학회지
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    • 제18권
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    • pp.193-216
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    • 1991
  • The purpose of this study is to analyze the area table of twenty editions of the DDC in order to identify what major changes have been made chronologically. The summaries about which were discussed according to the edition order about the change processes of the most extensive area table of the DDC auxiliary table are as follows. 1. It is from the 17th edition that area table appeared as a special auxiliary table in DDC for the first time and the method of classifying areas like from 930 to 999 which is regional history in history class was taken before the introduction of independent area table. 2. The entry numbers in which the area table was applied increased continuously until the 18th edition but the applied entry number was rather decreased in the 20th edition especially the number was mainly decreased in history class, this is the result of the fact that the entry was classified by area table without enumerating each regional history in history class except for the basic area since the 17th edition but recently at least the area of over national unit according to the necessity of enumerating the entry in regional history within history class. 3. The relocation or revision of area table was made according to the literary warrant of the relevant area by period political and administrative conditions and the request of related organization or classifiers of the area rather than by the topographical features therefore the revision was made chiefly about the highly interested Europe Northern America especially the United States. 4. The entry numbers which were expanded according to area indicate that gradual improvement for the international feature as the revision of edition is repeated is made but because of the expansion of Northern America, especially the United States, regional disproportion is represented by the occupation of 56% in the entire entry numbers of the United States in case of the 20th edition. Lastly, the reasonable reform plans of area table will have to be groped on the basis of the results of analysis above and the consideration about the problems in the development of area table of DDC and the other main classification systems.

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현대여성(現代女性)의 의복의식(衣服意識)에 관한 조사(調査) 연구(硏究) - 서울 지역(地域)의 양복(洋服) 착용자(着用者)를 중심(中心)으로 -

  • 이희명
    • 복식
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    • 제2권
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    • pp.73-88
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    • 1978
  • This article is an attempt to explain, at least in part, the contemporary Korean women's consciousness of Western Dreasses. As time changes, the role of clothing undergoes varisous transitions, while values and ways of life are constantly in change. It is, therefore, proper and appropriate to recognize as among the major aspects of social psychology such phenomenon as interests, understanding of clothing, the choice of a dress, and attitudes toward clothing, etc. The purpose of this study is to discover problems concerning and their clothing and their solutions, by means of a surveying approach. The method of research used is based upon questionares distributed to parents of first-year pupils in elementary schools and to female clerks working in offices, covering the period from August through October, 1976. The number of the questionares distrubuted totalled 600, and 526 were returned to the research to be utilized for analysis. The contents of the survey included such things as values concerning clothing, kinds of clothing and their practical use, the selection of clothing and the method of purchase, fashions, etc. The classification of aquisition are self-made clothing, clothing made to order and ready-made materials. It is composed of 25 items, including affirmative reasons as well as negative ones. The processing of the material returned was made by using the computer, and based upon classifications such as ages, monthly income, occupations; thus diagraming the result in percentages. The conclusion made and the improvements proposed are as follows: 1. The values of clothing were placed on the expression of the wearer's personality (32.7) and on eauty(28. 6%). The lower age group places is stress upon the expression of personality, while the higher age group stresses beauty. About 50% of wearers are contented with their clothing, their clothing, the rest of whom them indicating their dissatisfaction with what they wear. As to designs at the time of selection, about 46% indicated their preference of personal expression, 31.8% on usefulness. In selecting material, practicality is emphasized; in selecting patterns, single color is preferred. In short, personal expression and esthetic values are primary, with consideration of practicality in mind. 2. The classification of clothing according to their uses indicates the highest numbers in normal wear (home wears) and clothings to be worn outside home. As to evening dresses, (party dress) only one or two articles were checked by many, and no such article was clamed to be possessed by most. The highest ratio of wearing was shown in the case of home wear (47.3%) and clothing to be worn outside the home, which is 55.8%. The budget for one article of clothing was greatest in the case of home wear, and clothing worn outside the home. Many used both kinds of articles for the same purpose. It is desirable, therefore, that the kinds of clothing should be varied according to the purpose for which they are worn, and that clothing appropriate for that purpose should be worn. 3. The motivation for purchasing clothing was highly chosen in the item of seasonal change, which was 55.7%; Clothing deliberately made was indicated by 45.2%. In the mothods of purchasing clothing, clothing made to order and ready-made was indicated by 44.4%, which is the highest; Clothing made to order was 25.4%, and self-sewing was 1.1%, which is the lowest. (1) In the case of self-sewing, "I like it but it is very hard," was checked by 43.6%; "It is so difficult that I cannot wear such clothing" was checked by 13.3%. From these, we can conclude that the questionees are willing to make clothing by themselves, but techniques involved in sewing and at her problems involved in the skill are complicated but when those problems are eliminated there is a possibility for practice. The response checked by questionees concerning the self-sewing was, "It's economical", which is a clear indication that many questionees are positive for self-sewing. It is generally believed that ready-made clothing is cheaper, but it is not necessarily so. In consideration of the quality of clothing, self-sewing is a necessity, and it is desirable that it should be encouraged. (3) Problems involved in ready-made clothing, such as designs, skills, size (fitting) should be eliminated. When these problems are scientifically gotten rid of, it is possible that affirmative returns will be expected. Affirmative responses such as "Ready-made clothing is economical," "You can select there on the spot," are good signs that many women expect to wear ready-made clothing. It is in this sense that the prospect for ready-made clothing is brighter when much development for ready-made clothing is on the way. 4. Much concern for fashion are checked in such item of questions as "Fashionable clothing in the show window," "Clothes worn by women." The first item was checked by 50.1 %, and the second was checked by 48.6%. The reason for following fashion is "Because many people wear them," which was indicated by 30.4%. The reason for not following fashion is "It is too expensive," which was checked by 29.6%. The 26.2% of the answers indicated that "Fashionable clothing is devoid of personality," The influences of fashion over the development of fashion over the development of clothing are two-fold: Esthetic and active. It is not to be deniable that people follow fashion more or less. 1978.9>

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부산지역 일부 고등학교 학생들의 비만도와 흡연에 따른 구강보건관리에 대한 조사 (Investigation of oral health according to obesity and smoking in high-school in Busan)

  • 김민영;정의정
    • 한국치위생학회지
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    • 제7권3호
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    • pp.273-284
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    • 2007
  • Oral health in youth is very important because this period influences life for adult remarkably. Therefore, more effective oral health education and recognition of early treatment for oral disease are required sincerely. For more effectual education for high-school students, it is necessary to consider their circumstance like obesity and smoking. This study will analyze the correlation oral health behavior with obesity and subjective oral health concerns. In addition to, the actual condition of smoking for high-school girls and oral health condition will be verified. A survey was progressed for high-school girls in Busan city and BMI(body mass index) was used for classification of weight. The statistical significance was analyzed using SPSS 13.3 for Windows. Results of this study is following. 1. The frequence of daily toothbrushing was significantly different with obesity although difference of oral health knowledge was not significant. The frequency of toothbrushing of overweight students were lesser than the others. This results may be caused by low-level for oral health concerns and by passive life style of fat person. This habit has possibility of causing serious periodontal disease like periodontitis and tooth caries. 2. The correlation of obesity and time of brush change, using for supplement, and recent dental institution was insignificant. However, concerns of oral health were showed significantly according to obesity. Under-weight and standard-weight students were more concerned about oral health than over-weight. This results can be related to frequence of toothbrushing for fat subject. This relevance of two factors was confirmed by logistic regression analysis. 3. Approximately 70% students have smoking experience responded to uncomfortableness of periodontal conditions. On the other hand, non-smoking students felt uncomfortable in 50%. This results indicated that smoking have an effect on oral health condition. Further study which identify periodontal conditions practically has to go on for verification of direct correlation smoking and oral health.

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황사의 국내 연구동향과 최근 에피소드 분석 (The Research Trend of Asian Dust Storm (AD) of Korea and Recent Episode Analysis)

  • 박진수;한진석;안준영
    • 한국대기환경학회지
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    • 제29권5호
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    • pp.553-573
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    • 2013
  • This paper aims to give a summary and review of the research trend about subjects of Asian Dust (AD) storm in the last three decades. The AD research was focused on classification of synoptic scale data and finding inflow pathway in early stage. Recently, new approaches have been made to explain chemical composition, transportation, transboundary movement reaction of AD, using satellite data, 3D modeling, the aerosol time of flight mass spectroscopy, etc. During AD events, a large amount of dust particles flow into Korea and Japan from AD source areas, and they are highly likely to be mixed with toxic substances when air mass contained AD particles pass over seriously polluted areas. We concluded that, considering that AD events were classified into two cases according to the source area and pathway, the concentrations of crustal components did not increase at the initial stage of AD events, Whereas ammonium-sulfate, trace metal element, OC, EC relatively increased in the early stage. This explains AD events have the possibility of being accompanied with polluted air mass or particles. Also, we further need to compare and summarize the results of AD studies which already have been conducted, and prepare strategies for particle management, particularly for Black Carbon (BC) and Brown Carbon (BrC) which are considered to induce climate change effects.

민간기업 조경공사에서 나타나는 식재설계 변경 타당성에 대한 전문가 인식 분석 (An Analysis of the Cognition of Professionals Regarding the Validity of Planting Design Change that Occurred in the Landscape Construction of a Major Private Company)

  • 박재영;조세환
    • 한국조경학회지
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    • 제42권6호
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    • pp.101-110
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    • 2014
  • 본 연구는 민간기업에서 시행한 아파트 단지의 조경공사 중 식재설계변경의 유형과 변경의 타당성을 분석하여 공기업과 비교 고찰함으로써 조경공사 시에 발생하는 식재설계 변경을 객관적이고 효율적으로 관리하기 위한 기초 자료 제시를 목적으로 수행하였다. 본 연구의 결과 다음과 같은 다섯 가지를 얻을 수 있었다. 첫째, 민간기업에서 시행한 아파트 단지 조경공사에서 발생한 설계 변경 중 식재공사에서 발생한 비율이 61.8%를 차지하고 있음으로써 식재 부분이 설계변경의 주된 대상이 되는 것으로 나타났다. 둘째, 이러한 설계변경원인으로는 주로 공기부족 등 현장 여건과 관련되는 것이었고, 특히 체계적 설계변경보다는 현장에서 구두 설계변경승인으로 이루어지는 것으로 나타났다. 셋째, 식재설계의 설계변경은 한 건의 설계변경 승인에 7~48회의 동시다발적으로 발생하는 특징을 보이고 있었다. 넷째, 민간기업에서 발생하는 조경식재공사 설계변경 유형은 '이용자를 고려한 설계변경', '이미지 개선을 위한 설계변경', '유지관리의 용이성을 위한 설계변경', '설계내역 불일치로 인한 설계변경', '타 공종과의 관계로 인한 설계변경', '현장조사 미비로 인한 설계변경', '시공성을 고려한 설계변경' 등 총 7가지의 조경식재공사 설계변경 유형으로 구분할 수 있었는데 이것은 공기업에서 추진하는 설계변경 유형과 크게 다르지 않은 것으로 나타났다. 넷째, 이들 7가지 중 민간기업의 경우, '이용자를 고려한 설계변경'과 '이미지 개선을 위한 설계변경'이 전체 설계변경의 빈도에서 과반수를 넘는 것으로 나타나 공기업의 '이용자를 고려한 설계변경'과 '설계내역 불일치로 인한 설계변경'으로 나타난 것과 상이한 점을 보이고 있었다. 다섯째, 식재공사 설계변경 과정의 경우 민간기업은 공기단축을 통한 공사비용 절감 차원에서 선(先)시공 후(後)승인의 관행을 보이고 있는 것으로 나타났지만, 공기업의 경우 현장에서 설계변경 사유가 발생하였을 시 현장 상황 및 변경내용을 검토하고 반영하여 설계변경 절차를 보이는 등 상이한 절차를 거치는 것으로 나타났다. 이상의 결과는 조경공사 중 식재설계 변경의 유형은 공기업, 사기업에 관계없이 7개의 범주로 설계변경의 유형은 동일하나, 설계변경의 주된 사유와 절차는 상이한 점이 있는 것으로 나타남으로써 식재설계 변경은 조경공사의 성격에 따라 합리성과 효율성 차원에서 유동성 있게 적용하는 것이 바람직한 것으로 사료되었다.

KOMPSAT-1 EOC 자료를 활용한 2001년도 대전시 토지이용 현황의 공간적 분포 분석 (The Analysis of 2001 Land Use Distribution of Daejeon Metropolitan City based on KOMPSAT-1 EOC Imagery)

  • 김윤수;전갑호;이광재
    • 한국지리정보학회지
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    • 제7권3호
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    • pp.13-21
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    • 2004
  • 항공사진에 육박하는 고해상도 위성영상의 공급이 최근 위성 및 센서 기술의 비약적인 발전과 더불어 활발하게 이루어지고 있으며, 이와 같은 고해상도 위성 자료는 도시 토지이용현황 변화를 지속적으로 모니터링 할 수 있는 거의 유일한 수단이라 할 수 있다. 특히 1999년 12월 발사되어 2004년 8월 현재까지 성공적인 임무를 수행중인 KOMPSAT-1(KOrea Multi-Purpose SATellite) EOC(Electro-Optical Camera) 영상은 광역 도시에 대한 공간해상도 6.6m의 고해상도 영상 자료를 주기적으로 촬영, 공급하고 있어, 지금까지 거의 시도되지 못하였던 도시 토지이용현황 변화를 연도별로 추적, 분석할 수 있는 기반을 제공하고 있다. 따라서 본 연구에서는 2000년 국토지리정보원에서 발행한 대전광역시 토지이용 현황도와 2001년 KOMPSAT-1 EOC 자료를 중첩하여 육안판독에 의해 변화된 지역을 파악, 수정하는 방법을 사용하여 2001년 대전광역시 토지이용 현황도률 작성하고, 개개 항목별 토지이용 현황의 공간적 분포를 분석함으로써 축적된 위성자료를 활용한 토지이용 변화의 시계열 분석을 위한 선행 연구를 하고자 한다.

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텍스트 마이닝 기법을 이용한 환경 분야의 ICT 활용 연구 동향 분석 (A Study on Environmental research Trends by Information and Communications Technologies using Text-mining Technology)

  • 박보영;오관영;이정호;윤정호;이승국;이명진
    • 대한원격탐사학회지
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    • 제33권2호
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    • pp.189-199
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    • 2017
  • 본 연구는 텍스트 마이닝 기법을 활용하여 환경 분야에서 ICT의 활용 연구동향을 정량적으로 분석하였다. 이를 위해 환경 분야 키워드 38개, ICT 관련 키워드 16개를 바탕으로 국가과학기술정보센터(NDSL)에서 최근 20년(1996년-2015년)의 논문 359편을 수집하였다. 해당 논문을 대상으로 환경 분야 및 ICT 관련 자연어를 처리하여 말뭉치(Corpus)단위로 분류체계를 재구성하였다. 전술된 분류체계의 키워드를 바탕으로 텍스트 마이닝 분석 기법인 빈도 분석, 키워드 분석, 키워드 간 연관규칙을 확인하였다. 그 결과 '환경 일반' 및 '기후' 분야의 키워드 출현 빈도가 전체의 77 %, ICT는 '공공융합서비스' 및 '산업융합서비스'가 약 30 %의 비율을 차지하였다. 시계열 분석을 통해 환경 분야에서의 ICT 활용 연구는 최근 5년(2011년-2015년)사이에 급증하여 과거(1996년-2010년)과 비교하여 약 2배 이상 관련 연구가 증가된 것으로 나타났다. 키워드 간 연관 규칙을 생성하여 환경 분야를 기준으로 나타내었을 때, '환경 일반'은 16개, '기후'는 '14'개의 ICT 기반 기술을 주로 활용하고 있는 것으로 확인하였다.