폐고속국도의 생태복원 방안 -영동선 192.4K(인천) 지점을 중심으로-

조동길 ( Dong Gil Cho ),최재용 ( Jae Yong Choi ),전용철 ( Young Chul Jeon ) 한국환경보건기술학회(구 한국환경복원녹화기술학회) 2010 한국환경복원기술학회지 Vol.13 No.5

Expressways are often upgraded by widening the lanes and/or by reshaping the roads to be more linear for faster travel time. However, during the process of improving the route of the expressways, the areas where the old expressways used to be are often unused and abandoned. When these neglected sites are left alone, they often become dump sites causing pollution and impacting the surrounding environment. Therefore, it is important to restore the abandoned expressway sites to its full natural beauty. In this study, the abandoned expressway at the Soksa interchange in Pyungchang county, located in Kangwon province was studied for establishing the model of ecological restoration project. Considering the characteristics of the site, the target flora species was chosen to be Quercus species and the target fauna species as amphibians. After the target species were carefully chosen, each species` habitat requirements were studied in order to figure out the appropriate methods toward habitat restoration specifically for these species. In addition, to determine the most efficient method toward restoration of abandoned expressways, the study utilized the planting hole techniques, the crack techniques, and the colonization techniques. In terms of the spatial organization, public education program is incorporated at the main entrance area and the programs for experimenting, and developing vegetation and habitat restoration techniques are placed in the vicinity. In the master plan-to provide natural ecosystem at the site-ASCON (asphalt concrete) was removed first, then plans for restoration including species` habitat restoration were established. Furthermore, the project included plans for improving water quality polluted through non-point source considering the surrounding nearby road and farm lands. Finally, the study established a planning process that will experimentally apply to the abandoned expressway restoration method. In the future, there will be a continuous monitoring of the methods applied to verify if the restoration methods are effective. Also, new restoration techniques should be available according to a variety of abandoned expressways` characteristics.

두만강유역 환경협력체 구성방안 - 두만강유역 환경보전사업을 중심으로 -

최재용 ( Jae Young Choi ),이은재 ( Eun Jae Lee ) 국제지역학회 2005 국제지역연구 Vol.9 No.3

항공영상을 활용한 도로개발 전·후 산림 훼손지 개체목 분석

최재용 ( Choi Jae-yong ),김성열 ( Kim Seoung-yeal ),김휘문 ( Kim Whee-moon ),송원경 ( Song Won-kyong ),이지영 ( Choi Won-tae ),최원태 ( Lee Ji-young ),문건수 ( Moon Guen-soo ) 한국환경복원기술학회(구 한국환경복원녹화기술학회) 2018 한국환경복원기술학회지 Vol.21 No.4

Although the road construction in forest is increasing and there is a need for development ecological restoration on deforest area, no consideration has been given to individual trees in there. This study analyzed aerial photographs of deforest area before and after road construction for determining the degree of forest destruction by extracting individual trees. Study area was selected in the sites where are damaged by road construction in GongJu-si, YuSung-gu, and YeongDong-gun. The aerial photograph taken 1979 before construction is panchromatic image of 80㎝ in GSD (Ground Sample Distance) and other photograph taken 2016 after construction is multi-spectral image of 10㎝ in GSD. In order to minimize the difference of GSD, we conducted image re-sampling process for setting to same GSD for the two photographs. After that we carried out visual interpretation method for de termining to change of individual tree. The result found that for GongJu-si of the number of individual tree was 1,014 in 1979 and 886 in 2016, which decreased by 128 (12.6%) and the average width of those decreased from 5.77m to 5.75m by 0.47%. In case of YoungDong-gun, the number of it was 761 in 1979 and 746 in 2016, which decreased by 2.0% and the average width of it decreased from 8.99mm to 8.90m by 1.1%. Lastly in case of YuSung-gu, the number of it was 1,578 in 1979 and 988 in 2016, which decreased by 37.4% and the average width of it decreased from 7.09m to 6.65m by 6.21%. these result imply that road construction causes destruction of forests. Since there are limitations such as errors due to researcher, it is necessary to construct a quantitative analysis method for the change of the deforest area. It is need to study the method of extracting individual tree in deforest area more accurately using high-resolution image of GSD 10cm or more as well. This study can be used as a basic data for the ecological restoration of the deforest area considering characteristics of individual tree such as height, diameter at breast height, and biomass.

녹지총량제의 국외사례 및 국내 적용가능성

최재용 ( Jae Yong Choi ),이동근 ( Dong Kun Lee ),김은영 ( Eun Young Kim ),최인태 ( In Tae Choi ) 한국환경복원녹화기술학회 2008 한국환경복원기술학회지 Vol.11 No.2

다양성을 지원하는 그래프 데이터베이스 벤치마킹 시스템

최도진(Do-Jin Choi),백연희(Yeon-Hee Baek),이소민(So-Min Lee),김윤아(Yun-A Kim),김남영(Nam-Young Kim),최재용(Jae-Young Choi),이현병(Hyeon-Byeong Lee),임종태(Jong-Tae Lim),복경수(Kyoung-Soo Bok),송석일(Seok-Il Song),유재수(Jae-Soo Yoo) 한국콘텐츠학회 2021 한국콘텐츠학회논문지 Vol.21 No.12

객체 간의 관계를 표현하기 위해 정점과 간선으로 구성된 그래프 데이터를 효율적으로 저장하고 질의 처리하기 위한 그래프 데이터베이스가 개발되었다. 그래프 데이터베이스는 질의 유형이 기존 NoSQL 데이터베이스와 매우 다른 특성을 보이기 때문에 그래프 데이터베이스의 성능을 검증하기 위해서는 그래프 데이터베이스에 알맞은 벤치마킹 도구가 필요하다. 본 논문에서는 그래프 입력과 질의에 대한 다양성을 지원하는 효율적인 그래프 데이터베이스 벤치마킹 시스템을 제안한다. 제안하는 시스템은 그래프 데이터베이스에 대한 벤치마킹을 테스트하기 위해서 OrientDB를 활용한다. 입력 그래프와 질의 그래프의 다양성을 지원하기 위해서 기존 그래프 데이터 생성 도구인 LDBC를 이용한다. 벤치마킹 결과 분석을 통해 제안하는 기법의 타당성 및 실효성을 입증한다. 성능 평가 결과 제안하는 시스템은 사용자 정의 가능한 가상 그래프 데이터가 생성이 가능하며, 생성된 그래프 데이터를 기반으로 벤치마킹이 가능함을 보였다. Graph databases have been developed to efficiently store and query graph data composed of vertices and edges to express relationships between objects. Since the query types of graph database show very different characteristics from traditional NoSQL databases, benchmarking tools suitable for graph databases to verify the performance of the graph database are needed. In this paper, we propose an efficient graph database benchmarking system that supports diversity in graph inputs and queries. The proposed system utilizes OrientDB to conduct benchmarking for graph databases. In order to support the diversity of input graphs and query graphs, we use LDBC that is an existing graph data generation tool. We demonstrate the feasibility and effectiveness of the proposed scheme through analysis of benchmarking results. As a result of performance evaluation, it has been shown that the proposed system can generate customizable synthetic graph data, and benchmarking can be performed based on the generated graph data.

ArangoDB기반 벤치마킹 시스템 설계 및 구현

최도진(Do-Jin Choi),백연희(Yeon-Hee Baek),이소민(So-Min Lee),김윤아(Yun-A Kim),김남영(Nam-Young Kim),최재용(Jae-Young Choi),이현병(Hyeon-Byeong Lee),임종태(Jong-Tae Lim),복경수(Kyoung-Soo Bok),송석일(Seok-Il Song),유재수(Jae-Soo Yoo) 한국콘텐츠학회 2021 한국콘텐츠학회논문지 Vol.21 No.9

ArangoDB는 대용량 데이터 저장을 위해 많은 응용에서 활용되고 있는 NoSQL 데이터베이스 시스템이다. ArangoDB와 같은 새로운 NoSQL 데이터베이스 시스템을 실제 환경에 적용하기 위해서 성능을 평가해 줄 수 있는 벤치마킹 시스템이 필요하다. 본 논문에서는 응용 계층뿐만 아니라 커널 계층에서의 성능이 측정 가능한 ArangoDB 기반 벤치마킹 시스템을 설계하고 구현한다. 클러스터 환경에서의 NoSQL 데이터베이스 시스템 성능을 측정하기 위해서 YCSB를 일부 수정한다. 또한, 기존 자료 분석을 통해 실세계에서 발생하는 세가지 워크로드 유형을 정의한다. 세 가지 워크로드 유형의 벤치마킹을 통해 ArangoDB에서 활용 가능한 워크로드를 도출하였고, 응용 계층뿐만 아니라 커널 계층의 성능이 가시화될 수 있음을 입증하였다. 기존 데이터베이스에서 ArangoDB로 데이터 이전 작업이 필요한 환경에서는 본 시스템의 벤치마킹을 통해 적용 가능성과 리스크 검토가 가능할 것으로 기대된다. ArangoDB is a NoSQL database system that has been popularly utilized in many applications for storing large amounts of data. In order to apply a new NoSQL database system such as ArangoDB, to real work environments we need a benchmarking system that can evaluate its performance. In this paper, we design and implement a ArangoDB based benchmarking system that measures a kernel level performance well as an application level performance. We partially modify YCSB to measure the performance of a NoSQL database system in the cluster environment. We also define three real-world workload types by analyzing the existing materials. We prove the feasibility of the proposed system through the benchmarking of three workload types. We derive available workloads in ArangoDB and show that performance at the kernel layer as well as the application layer can be visualized through benchmarking of three workload types. It is expected that applicability and risk reviews will be possible through benchmarking of this system in environments that need to transfer data from the existing database engine to ArangoDB.

그래핀이 표면에 분포된 미립자를 이용한 열전도 복합재료의 개발

최재용(Jae-Yong Choi),이주혁(Joo Hyuk Lee),김미리(Mi Ri Kim),이기석(Ki Seok Lee),조국영(Kuk Young Cho) 한국청정기술학회 2013 청정기술 Vol.19 No.3

열전도성 복합재료는 방열특성이 요구되는 다양한 분야에 응용되고 있다. 그래핀은 우수한 전기전도성, 기계적 특성, 열전도 특성을 가지는 잠재성이 높은 물질이다. 그러나 기존의 그래핀 입자를 사용한 경우에서는 유기용매를 이용하여 분산을 하게 되어 청정생산공정측면에서 이를 개선하는 연구가 필요하다. 본 연구에서는 마이크로플루이딕(microfluidic)으로 균일한 미립자를 제조하는데 있어 계면안정제를 도입하여 수분산을 통한 그래핀 용액을 연속상(water phase)으로 사용하여 표면에 그래핀이 분포된 폴리메틸메타크릴레이트(Poly(methyl methacrylate), PMMA)미립자를 제조하였다. 본 연구의 제조방법은 소량의 그래핀으로 열전도 특성이 향상되어 열전도성 복합재료로 사용이 가능하다. Thermally conductive materials are widely used in various applications where effective heat dissipation is required. Graphene shows high potential for various uses owing to high electrical conductivity, good mechanical strength, and high thermal conductivity. Generally previous works used organic solvents are generally used for the dispersion of graphene in fabrication procedure. In order to achieve clean fabrication it is required to use water media. In this study, we fabricated graphene attached poly(methyl methacrylate) (PMMA) microsphere via microfluidic method. With the aid of surfactant, graphene was well dispersed in water which was used as continuous flow. Thermal conductivity was improved with the small amount of graphene addition and this indicate potential use of this system for thermally conductive composite material.

미디어가 범죄에 대한 두려움에 미치는 영향: Mean-World View와 공명가설을 중심으로

최재용 ( Jae Yong Choi ),한보영 ( Bo Young Han ),이윤호 ( Yoon Ho Lee ) 대한범죄학회 2014 한국범죄학 Vol.8 No.3

The purpose of this study is to examine whether the violence in media account for fear of crime based on the ``Mean-World View`` which argue that the image from the media can make audience recognize the world anew. Furthermore, this study attempts to examine the resonance hypothesis which hypothesize that indirect experience from the media can be resonated with the direct victimization experience, whereupon increase the fear of crime in audience. For this purpose, this study conducts the multiple regression analyses. The data is drawn from 2010 Crime Victim Survey. As a result, ``Mean-world View`` and Resonance hypothesis indicates different outcomes. Firstly, influence of media according to the ``Mean-World View`` shows the robust impact on fear of crime even with all the other control variables in advanced studies. On the other hand, it has not been discovered that such an influence can be enhanced by the victimization experience. The results imply that exposure related to violence or crime can increase the individual fear of crime and social distrust. Thus, these findings hence conduce to the need to sublate indiscriminate and stimulating information transmission.

청소년 지위비행 원인의 성별비교: 일반범죄이론들을 중심으로

최재용 ( Jae Yong Choi ),한보영 ( Bo Young Han ),이윤호 ( Yoon Ho Lee ) 대한범죄학회 2014 한국범죄학 Vol.8 No.1

The purpose of this study is to examine how general crime theories account for gender differences in causes of adolescent status delinquency. This study attempts to conduct logistic regression analyses on male and female samples in order to compare and examine influences of respective variables of the following four major crime theories-General Strain Theory, Differential Association Theory, Social Bond Theory, and Self-Control theory. The result indicates that the theory that holds greatest relevance to status offenses by both sexes is the Differential Association Theory. When it comes to causes of delinquency however, there are noticeable gender differences. The most notable difference is that in the case of male delinquency, male offenders`` social attachment to their friends significantly affects their chances of delinquency. In addition, it has been discovered that males with experiences of parental abuse showed greater tendency towards status delinquency in general, while females who have experienced family disassociation also showed increased chances of status offense. These findings hence conduce to the need to arrange for gender-specific measures in preventing youth delinquency.

기계수확 방법에 따른 양파의 품질 및 저장성

권영경(Young-Kyeong Kwon),최재용(Jae-Yong Choi),황태건(Tae-Gun Hwang),박준영(Jun-Young Park),이용재(Yong-Jae Lee) 한국원예학회 2022 한국원예학회 학술발표요지 Vol.2022 No.11