Comparison of Air Pollution Management Policies between China and Korea

SHEN, Ping,PARK, Jae Hong,JUNG, Jong tai Urban Science Institute 2020 도시과학 Vol.9 No.1

With the rapid development of China's industrialization and urbanization, air pollution has become a growing concern. The emergence of air pollution not only affects people's health, but also restricts the development of China's social economy. This paper puts forward specific measures for air pollution control by examining the causes of air pollution and by comparing air pollution status and management policies between Korea and China. Methods of control involve improving the urban environmental management mechanism, spreading awareness of urban environmental management and air pollution management laws and regulations system, strengthening clean energy utilization and urban environmental greening, increasing investment and management funds and more. Through these measures, urban environmental management in China can be accelerated and level of environmental management improved.

A study on urban planning between Buyeo and Kyoto in terms of the interrelationship over the history

Kim, Jinho Urban Science Institute 2018 도시과학 Vol.7 No.1

Due to the strong relationship between Baekje, one of the ancient Korean Kingdom and Japan through the same religion, Buddhism, it is possible to find many similarities in remains, such as temples, and pagodas, and in many relics, in both cities. However, from the point view of urban planning, Buyeo, originally designed as the fortress city, has a different city planning strategies from that of Kyoto which is a straight-lined city. After Buyeo was destroyed by Silla, one of the Three Kingdoms in Korea, it got deemphasized in Korean history. Later, Buyeo's recent city planning was directly affected and implanted in Japanese Imperialism period (1910-1945) one which emphasizes the layout of Japanese temple which serves as the center of the ceremonies for their ancestors. Thus, it is possible to find cultural interrelation in urban planning between two cities throughout the history of Korea and Japan.

The dynamic spatial organization found in Ancient Roman architecture

Kim, Jin-Ho Urban Science Institute 2018 도시과학 Vol.7 No.2

The purpose of this study is to review and evaluate the proper planning for 2030 Incheon Urban Parks & Green Space Master Plan. Some of the plans are aimed at multiple small districts within the city's old town, as local governments are planned to be sub-subsidized by Incheon Metropolitan City. However, these plans have become simple plans for each district and therefore find it difficult to collect from the perspective of the using system of the residents who are directly used. First, the construction of the urban park and green space network requires the construction of a service using system that can be felt by the users. Second, the basic idea of each district planned as the detailed strategy of the master plan should be planned through consultation with nearby the district. Third, specific targets and directions for the urban park and green space plan through the urban development project are needed.

Performance Analysis of Bridge using Structural Health Monitoring: Seong-Su Bridge Case-study

Kaloop, Mosbeh R.,Ban, Woo Hyun,Hu, Jong Wan Urban Science Institute 2019 도시과학 Vol.8 No.1

The performance evaluation of existing structures is important to study the safety of those structures with changing the loads over the lifetime of structures. Therefore, this study aims at evaluating the Seong-Su bridge, Seoul, Korea, using structural health monitoring (SHM) system. The static and dynamic tests are used to assess the behavior of the bridge. The statistical and wavelet analyses are used to demonstrate the behavior of the bridge in the time and frequency domains. The previous SHM results are used to assess the bridge performance. The results of this study show that the bridge performance under static and dynamic loads is safe in time and frequency domains.

Application and Development of Activated Carbon Adsorption in Wastewater

Zhang, DianYa,Deng, ChengXun,Deng, Xu,Yu, ZhiMin Urban Science Institute 2019 도시과학 Vol.8 No.2

With the continuous progress of modern science and technology and the rapid development of economy, with the continuous development of society, the treatment of industrial and domestic sewage has become a hot concern. Toxic substances and non-degradable pollutants in wastewater also have a great impact on the environment. This paper mainly expounds the current environmental situation and the adsorption mechanism of activated carbon. And the application and development of activated carbon adsorption in wastewater.

Analysis of non-point and point source pollution load in DongPieHong Ditch

Shan, Yu,Chen, Jun,Jin, Jie,Song, YongLian,Liu, Jun,Wu, DongBiao,Wu, Ke Urban Science Institute 2019 도시과학 Vol.8 No.2

In this study, the DongPieHong Ditch were taken as the research object, five sampling points were set to measure the COD, NH₃-N,TNandTPindexes. The correlation and principal component analysis were used to judge the main pollution sources and calculate pollution contribution rate. According to the population in the basin, the load of point source pollution into the river was estimated. As a result, the load of COD, NH₃-N and TP into the river was 323.04t/a, 43.8t/a and 3.9t/a, respectively. According to the statistics of the rainfall in the basin, the concentrations of COD, TP and NH₃-N in the initial rainwater were measured and calculated for non-point source pollution, and the results shown that the inflow loads of COD, NH₃-N and TP into the river were 34.59t/a, 0.12t/a and 0.71t/a, respectively. It was found that the main cause of the pollution in the east flash flood gully was point source pollution, and the proportions of COD, NH₃-N and TP into the river were 90.33%, 99.72% and 84.61%, respectively.

Time-resolved polarization and depolarization tracking on reaction pathway of calcium carbonates in a view of non-classical nucleation theory

김광목,Kim, Gwangmok Urban Science Institute 2020 도시과학 Vol.9 No.2

The formation characteristics of calcium carbonates are closely related to the durability and mechanical properties of cement-based materials. In this regard, a deep understanding of the reaction pathway of calcium carbonates is critical. Recently, non-classical nucleation theory was summarized and it was presumed that prenucleation clusters are present. The formation of the prenucleation cluster at undersaturated condition (≈ 0.1 ml) in the present study was investigated via electrical characteristics of an electrolytic solution. Calcium chloride dihydrate (CaCl2·2H2O) and sodium carbonate (Na2CO3) were used as starting materials to supply calcium and carbonate sources, respectively. Furthermore, the reaction pathway of calcium carbonates was investigated by time-resolved polarization and depolarization characteristics of the electrolytic solution. The time-resolved polarization and depolarization tests were conducted by switching polarity with an interval of 20 seconds for 1 hr and by measuring the variation of electrical resistance. It can be inferred from the results obtained in the present study that the reactive constituent for the formation of calcium carbonates was mostly consumed in the period possibly associated with the prenucleation and the reaction pathways may be governed by the monomer-addition mechanism.

Evaluation of Pollutant loads at Inflow Streams under Ara Waterway Basin

한상윤,정종태,Han, Sangyun,Jung, Jongtai Urban Science Institute 2021 도시과학 Vol.10 No.1

In this study, to evaluate the characteristics of the pollution in the major inflow tributaries and major environmental facilities in the watershed of Ara waterway, An inflow flow rate measurement and water quality analysis were conducted during dry and rainy seasons. In addition, the flow rate measurement, water quality analysis, and pollutant load at each monitoring point were compared and evaluated. Influx of BOD5, T-P and T-N into the tributaries of the ARA waterway watershed, excluding the Gulpo river watershed, during dry season were only 0.007%, 0.005% and 0.004% respectively of the incoming loads in the entire ARA waterway basin. In addition, it was confirmed that the discharge pollutant loads during rainfall event was about 440 times more for BOD5, about 545 times on T-P, and about 23 times on T-N in comparison to the pollutant loads during the dry days. When the Gulhyeon rubber dam was deflated, the discharged pollutant load during a rainfall was higher than the estimated load at the G7 monitoring point because the deposited pollutants from the upstream riverbed flowed down. Therefore, during a rainy season, it is necessary to manage the influx of high-load water pollutants from the overflow and deflation of the Gulhyun rubber dam as well as to find a strategy to reduce the pollutant loads in the Gulpo river watershed.

Effects of carbonation on hydration characteristics of ordinary Portland cement at pre-curing condition

Kim, Gwang Mok Urban Science Institute 2022 도시과학 Vol.11 No.1

Raman spectroscopy is effective to investigate functional groups via molecular vibration. The technique offers the structural information of compounds including subtle changes in the chemical composition of local atomic coordination without critical damage. Thus, the effect of carbonation on the hydration characteristics of Portland cement under pre-curing conditions for carbonation was investigated via Raman spectroscopy in the present study. Gaseous CO₂ was injected within 60 seconds, and the reaction time was varied from 0 minute to 90 minutes. The test results indicated that the Ca/Si ratio of C-S-H reduced immediately after mixing and then the C-S-H with a relatively high Ca/Si ratio coexisted as the reaction time increased. The calcium carbonates formed in the present study included calcite and amorphous calcium carbonates. The test results via Raman spectroscopy provide valuable information about the carbonation characteristics of OPC under pre-curing conditions for carbonation.

The determinants of Emergency Care Utilization and Equity of Access to Care in Elderly Koreans

이석민,박주문,Lee, Sukmin,Park, Ju Moon Urban Science Institute 2019 도시과학 Vol.8 No.1

This study examines the determinants of emergency care utilization and equity of access to care in elderly Koreans. Based on the data from the 2014 Korea Health Panel Survey, descriptive and logistic regression analysis was performed. The sample for this study was 1,313 individuals who participated in interviews. Predisposing factors such as age, sex, and education were significant determinants of emergency care utilization. Differences in need do not fully account for the original differences observed between subgroups of older Koreans. Health status was important determinant of older Koreans using emergency care services. Spending medical expense did not ameliorate the subgroup differences in the use of emergency care services. Nonetheless, spending medical expense remains a particularly important predictor of emergency care utilization. Health care reforms in Korea should continue to concentrate on insuring effective universal emergency care, implying that all older Koreans with need receive effective coverage. Future study is also needed to understand the access barriers that may exist for the selected demographic subgroups, i.e., those over 75, women, less educated persons, and those with higher medical expense. 본 연구의 목적은 노인들의 응급의료이용에 영향을 주는 요인들을 알아보고 의료접근의 형평성을 조사하는 데 있다. 2014년 한국의료패널조사 자료를 사용하여 기술분석과 로지스틱회귀분석이 행하여졌으며 인터뷰에 참여했던 1,313명의 노인들이 표본으로 선정되었다. 연령, 성별, 교육수준 등의 인구변수들이 응급의료이용의 중요한 결정요인이었다. 의료요구는 노인 계층 간 응급의료이용의 차이를 충분히 설명하지 못한 걸로 나타났으나 건강상태는 응급의료서비스를 사용하는 노인들의 중요한 결정요인이었다. 의료비지출은 응급의료서비스이용의 계층 간 차이를 개선하지 못했으나 응급의료이용의 중요한 예측요인으로 남았다. 한국에서 의료개혁은 의료요구를 가진 노인들이 효과적인 진료혜택을 받을 수 있도록 전국민 응급의료 보장을 확대하는 방향으로 계속 이루어져야 한다. 앞으로 연구도 75세 이상의 교령노인과 여성 및 교육수준이 낮은 노인, 그리고 높은 의료비 지출을 하는 노인과 같은 인구계층들에게 혹시 있으지 모르는 의료접근의 장애들을 허무는 방향으로 이루어질 필요가 있다.