내수재해 위험지구 평가 방법과 그 적용

이창준, 김민환 호남대학교 산업기술연구소 2014 녹색산업연구 Vol.20 No.1

풍수해는 매년 증가하고 있으며 그 강도도 커지고 있는 실정이다. 풍수해의 유형은 하천재해, 내수재해(호우재해), 사면재해, 토사재해, 바람재해로 구분할 수 있다. 그 중에서 내수재해에 대한 평가 방법을 소개하고 그 방법을 D군에 적용하여 내수재해 위험지구를 선정하였다. D군의 내수재해 위험요인을 분석한 결과, 우수관거 관련 문제, 외수위 상승으로 인한 피해, 우수처리 시설 문제, 주변보다 지반고가 낮은 문제, 토석류의 유입으로 하천 소통 능력 저하 등의 2차적 침수피해 등으로 분석되었다. D군의 내수재해 위험지구를 위험요인별로 분류하여 제시하였다. Storm and flood damage is increasing every year and its strength is large in Korea. Type of storm and flood damage can be classified with river disasters, domestic disasters(heavy rain disaster), slope disaster, landslides disaster, and wind disaster. A method of assessment for domestic disaster was introduced, and applied to the D-district. The risk factors for domestic disaster of D-district are insufficient channel-section problem of sewer, damage by rising water levels in river, plant problems of rainfall treatment, problems surrounding the lower elevation, and reduced cross-section due to debris flows. Domestic disaster risks for D-district were classified into several type. Factors for the disaster risk was presented. Key words: Storm and flood damage, Domestic disasters, Flood damage

하도 버퍼링에 의한 침수구역 설정 방법과 그 적용

고성찬・이창준・김민환 호남대학교 산업기술연구소 2014 녹색산업연구 Vol.20 No.1

집중호우가 발생할 때 유역의 특성을 고려한 재해 대책이 필요하다. 침수구역을 객관적으 로 평가하기 위해 지형 특성과 지형 정보를 활용하였다. 적정한 침수구구역의 설정은 침수 방지 시설을 갖추기 위한 선행 작업이다. 이 작업을 위해 최근에 개발된 Arc-Gis를 이용하 여 침수구역을 설정하였다. 이 방법을 증암천 유역에 적용하여 위험구역을 설정하였다. There is require disaster prevention considering the characteristics of the watershed when heavy rains occur. We have to objectively evaluate the flooded area using topographic characteristics and geographic information. A set of appropriate flooded area should be preceded for facilities of flood prevention. We have established a flooded area using the latest version Arc-Gis. This software was applied to the classification for flood hazard area at Jeungam-stream basin.

EPS & SBW 시스템을 위한 모의 조향장치 개발

김창준(Changjun Kim),김기헌(Kiheon Kim),김현수(Hyunsoo Kim),한창수(Changsoo Han) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

When we study steering system, making use of HILS is general method to study. Generally, HILS of steering System is cheaper than real car test in the economical aspect and timesaving aspect. If we test various series of vehicles or use the other type of steering systems, however, uneconomical trial to establish the new HILS system. To minimize the economical and periodical loads, we would try to introduce the new HILS system to fit diverse steering systems. We design the moving column system to correspond to each other vehicles and adopt the extension unit to satisfy the many types of tread.

Steer-by-Wire 시스템을 위한 조향감 향상

김창준(Changjun Kim),김현수(Hyunsoo Kim),김기헌(Kiheon Kim),한창수(Changsoo Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

This paper is about steering system of Steer-by-Wire(SBW). As a SBW system is applied in order to improve steering feel and maneuverability, the controller should have two purposes. One is controlling steering wheel for the driver's steering feel and the other is controlling the front wheel system for vehicle stability. This study focuses on steering wheel system. The column is reduced in the SBW steering wheel system. Therefore it need artificial steering feel. This is the study for an objective evaluation method with steering angle, steering torque to quantify steering feel of SBW system. Based on this method, the affect two different torque map performance was simulated and compared each other.

Analysis of Green Area Ratio by Industrial Complex Type to Minimize DEFORESTATION

Changjun Kim,Hyangju Lee,Wonhyeon Lim J-INSTITUTE 2021 Public Value Vol.6 No.3

Purpose: As the economy grows, many forests, fields, and agricultural land have been converted into industrial complexes. Accordingly, there are deep concerns about damage to the natural ecosystem and environmental im-pact. This study analyzed the factors related to the natural environment by type for industrial complexes promot-ed in forest areas. The authors hope to balance development and conservation by identifying the relationship between factors related to the natural environment. In addition, this study tried to derive rational ways to develop industrial complexes suitable for low-carbon green growth. Method: This study was analyzed based on 95 environmental impact assessments that business operators ap-plied for consultation with agencies concerned to build industrial complexes in Daegu and Gyeongbuk, Korea, for 16 years from 2005 to 2020. The researchers conducted a one-way ANOVA analysis to determine the difference in green area ratio, forest field ratio, tree transplantation ratio, and ecological area ratio by industrial complex type . Post-hoc analysis was performed by the Scheffe test. This paper used the Spss Statistics 21 statistics program to conduct the above statistical analysis. Results: The number of consultations for industrial complexes was highest for general industrial complexes. The green area ratio was 5.60% higher in national industrial complexes than in agricultural and industrial com-plexes. The forest field ratio was 71.84% in quasi-industrial complexes, 40.14% higher than 31.70% in quasi-agro-industrial complexes. The tree transplantation ratio was low in national industrial complexes and quasi-industrial complexes. The ecological area ratio decreased by 72.93% after development compared to before development in general industrial complexes and decreased by 65.75% after development compared to before development in national industrial complexes. Conclusion: Before the industrial complex development, the forest field ratio showed differences by type. How-ever, there was no difference in the ecological area ratio after the development of the industrial complex. This result was seen as the minimum standard set by law in parks and green areas. Therefore, it is necessary to develop eco-friendly industrial complexes rather than reckless development to minimize forest damage. The authors be-lieve it is necessary to respond to climate change and contribute to low-carbon green growth by minimizing the forest area within the development area and increasing the ecological area ratio and tree transplantation ratio after development.

A Study on the CHANGE in Plants of the Wind Power Complex in Mt. Hyeonjong

Changjun Kim,Hyangju Lee,Wonhyeon Lim J-INSTITUTE 2020 Protection Convergence Vol.5 No.2

Purpose: To identify the changes in plants before, during, and after the wind farm construction in Mt. Hyeonjong, we investigated the number of plant species. And we studied the main characteristics of the distribution status in plants family composition, plant life form analysis, Korean endemic plant, rare plant, specific plants by phytogeography, naturalized plant, and invasive alien plants. We compared this data to confirm the change before or after the wind farm construction. Method: We conducted the plants form research 16times in five years. Before the wind farm construc-tion(2014 and 2015), during the wind farm construction(2017 and 2018), and after the wind farm con-struction(2019). Plants changes were analyzed based on the results obtained through field trips. Accord-ing to the national standard plant list, we listed plant names and scientific names(the Korea national arboretum & the plant taxonomic society of Korea 2015). We arranged the classification groups according to the Engler system. Based on the created plants list, the Korean endemic plant, rare plant, specific plants by phytogeography, naturalized plant, and invasive alien plants were extracted and analyzed. Results: The vascular plants decreased compared to before wind farm construction. Compositae was the most common category in plants family composition. Korean endemic plants decreased from 3 spe-cies before the construction to 2 species after the construction. Rare plants were investigated 4 species of Vulnerable species(VU) and 2 species of Least Concerned species(LC). Specific plants by phytogeogra-phy were surveyed the same as a total of 13 species. Naturalized plants decreased from 33 species to 20 species and 26 species. Then, they increased again. Conclusion: As a result of this study, the total plant species, Korean endemic plant, and rare plant growing were reduced in the wind farm section in Mt. Hyeonjong. However, many Naturalized plants and 1 and 2 years old herbage appeared in the area. So we found out that ecological stability was not yet stable, and the disturbance was continuing. In this study, the investigation period after wind farm con-struction is one year, which is a short time to observe and analyze plants succession state, and a follow-up study to examine the growth characteristics of plants more closely is needed.

Fabrication of SiC nanoparticles by physical milling for ink-jet printing.

Kim, Jong-Woong,Shim, Jae-Shik,Maeng, Changjun,Kim, Young-Sung,Ahn, Jinho,Kwak, Min-Gi,Hong, Sung-Jei,Cho, Hyun-Min American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.8

<P>Here we tried to show the possibility of mechanical milling method for fabrication of SiC nanoparticles and ink-jet printing method to make SiC patterns for use as several applications, e.g., micro hotplates. Planetary milling was employed to fabricate the nano-scale SiC particles from coarse powders. After 100 hours of milling, the size of the SiC particles decreased to about 100 nm, which was sufficient for the formulation of ink for ink-jet printing. The SiC particles were dispersed in an ink system consisted of ethylene glycol and ethanol with a small amount of additives. The ink with SiC nanoparticles could be successfully printed on an alumina substrate by the ink-jet printing method.</P>

A Study on the Utilization Plan for Functionally Lost Reservoirs: Focused on Daegu and Gyeongbuk

Changjun Kim,Hyangju Lee,Wonhyeon Lim J-INSTITUTE 2022 International Journal of Human & Disaster Vol.7 No.2

Purpose: Korea has a climate with significant seasonal variation in precipitation. There were often difficulties in the agricultural season due to the lack of rainfall. Since ancient times, many reservoirs have been built for irrigation facilities. This study aims to suggest utilization plans by analyzing the size, pop-ulation of the surrounding area, the surrounding ecological grade, and accessibility for the functionally lost reservoirs. Method: Researchers analyzed 155 reservoirs with loss of function and low utilization among reser-voirs in Daegu and Gyeongbuk. The reservoir size was classified based on the total storage amount of 50,000m3, and the surrounding area's population was based on 10,000 people. The ecological grade around reservoirs was based on the ecological and natural map of the Ministry of Environment, and the accessibility was classified based on road networks connected around reservoirs. Results: As a result of analyzing the functionally lost reservoirs by size, 10 places belonged to the 'upper' group, and 145 places belonged to the 'lower' group. By surrounding area's population, 28 places belonged to the 'upper' group, and 127 places belonged to the 'lower' group. By surrounding ecological grade, 93 places belonged to the 'upper' group, and 62 places belonged to the 'lower' group. By accessi-bility, 59 places belonged to the 'upper' group, and 96 places belonged to the 'lower' group. Conclusion: The 8 reservoirs can be used as water-friendly reservoirs with easy access. The 3 reservoirs can be used as leisure types with sufficient size. It would be able to use 11 ecological experience type sites and 79 ecological preservation type sites, considering nearby conditions. The 48 reservoirs can be used to supply electricity to nearby households. The 6 reservoirs can be used as an emergency type for drought. In this study, the utilization types of reservoirs were classified according to various conditions. However, as these are only a rough guide for the direction of reservoir use, further research is needed to refine the utilization plans or find alternatives according to the characteristics of each reservoir.

Triphenylamine-Based Supramolecular Polymers for Conductive Gel

Changjun Park,Jisung Kim,Jinhee Lee,Sang Youl Kim 한국고분자학회 2016 한국고분자학회 학술대회 연구논문 초록집 Vol.41 No.2

Consideration of GREENAREARATIO When Establishing an Urban Development Plan

Changjun Kim,Hyangju Lee,Wonhyeon Lim J-INSTITUTE 2021 Protection Convergence Vol.6 No.2

Purpose: Just as the natural environment is vital for people to live in, the park and green area, which are indicators for eco-friendly development, are essential when proceeding with urban development projects. Therefore, this study reviewed focusing on the park and green area ratio in the environmental impact assessment for urban development projects. Through this, we intended to provide a comprehen-sive guideline for environmental land use planning and design for urban development or residential land development projects and to guide plans and designs based on this. Method: The analysis was based on the environmental impact assessment, which was investigated for 145 urban development projects for 18 years from 2003 to 2020. We conducted a one -way ANOVA analysis to determine the difference between the green area rate by year, the green area rate by region, the population density by region, and the park area per person by region. Post-hoc analysis was per-formed by the Scheffe test. To conduct the above statistical analysis, we used the Spss Statistics 21 sta-tistics program. Results: The number of consultations on environmental impact assessment for urban development projects by year was the highest in 2006 and 2008, with 14 cases(9.66%). The green area rate by year was as high as 25.09% in 2005, 24.88% in 2007, and 22.73% in 2009. The green area rate by region was the highest in the Gangwon area with 22.63%, followed by 20.47% in the metropolitan area, 19.59% in the Honam area, and 19.51% in the Chungcheong area. The population density by region was the high-est with 2.10(person/m2) in the metropolitan area. Next the Gangwon area was 1.99(person/m2) and the Southeast area was 1.80(person/m2). The park area per person by region was the largest in the Honam area, with 10.93m2. Conclusion: The area of parks and green spaces is seen as the minimum standard stipulated by law. However, the high green area ratio and the difference in population density by region during active ur-ban development projects are to create a pleasant residential environment. Therefore, in a place with high population density, it is necessary to establish a high standard for securing green space to create a comfortable living environment. Also, in the case of parks, the location is essential as well as the area. Since green areas on slopes excluding parks in the green area ratio are difficult to use, we insist that green areas on slopes should be reduced, and park areas should be set high to create a pleasant resi-dential environment.