• Title/Summary/Keyword: Civil Society

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A Comparative Study on the KDC, NDC, and DDC Classification System for Civil Engineering (KDC, NDC, DDC의 토목공학 분야 분류체계 비교 연구)

  • Kim, Yeon-Rye
    • Journal of the Korean BIBLIA Society for library and Information Science
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    • v.20 no.3
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    • pp.219-232
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    • 2009
  • This paper is intended to comparatively analyzed the KDC/NDC/DDC classification system for the field of civil engineering, the research field classification system of National Research Foundation of Korea, and the science and technology research field classification system of Korea Science and Engineering Foundation. And based on the analysis, it tried to propose the ways of improving the KDC classification system for the civil engineering field. As a result of the analysis, this paper has found that the KDC 5th-edition for the civil engineering field needed some corrections. That is, the classification items that reflect the trend of academic development should be added, the classification terminology of the basic theories of civil engineering should be properly developed, segmented topics should be added, any errors in classification codes and Korean/English descriptions should be corrected, and the omission of the KDC relative index of classification items should be solved. This paper proposed the ways of improving those problems.

Effect of Non-Plastic Fines Content on the Pore Pressure Generation of Sand-Silt Mixture Under Strain-Controlled CDSS Test (변형률 제어 반복직접단순전단시험에서 세립분이 모래-실트 혼합토의 간극수압에 미치는 영향)

  • Tran, Dong-Kiem-Lam;Park, Sung-Sik;Nguyen, Tan-No;Park, Jae-Hyun;Sung, Hee-Young;Son, Jun-Hyeok;Hwang, Keum-Bee
    • Journal of the Earthquake Engineering Society of Korea
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    • v.28 no.1
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    • pp.33-39
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    • 2024
  • Understanding the behavior of soil under cyclic loading conditions is essential for assessing its response to seismic events and potential liquefaction. This study investigates the effect of non-plastic fines content (FC) on excess pore pressure generation in medium-density sand-silt mixtures subjected to strain-controlled cyclic direct simple shear (CDSS) tests. The investigation is conducted by analyzing excess pore pressure (EPP) ratios and the number of cycles to liquefaction (Ncyc-liq) under varying shear strain levels and FC values. The study uses Jumunjin sand and silica silt with FC values ranging from 0% to 40% and shear strain levels of 0.1%, 0.2%, 0.5%, and 1.0%. The findings indicate that the EPP ratio increases rapidly during loading cycles, with higher shear strain levels generating more EPP and requiring fewer cycles to reach liquefaction. At 1.0% and 0.5% shear strain levels, FC has a limited effect on Ncyc-liq. However, at a lower shear strain level of 0.2%, increasing FC from 0 to 10% reduces Ncyc-liq from 42 to 27, and as FC increases further, Ncyc-liq also increases. In summary, this study provides valuable insights into the behavior of soil under cyclic loading conditions. It highlights the significance of shear strain levels and FC values in excess pore pressure generation and liquefaction susceptibility.

Prediction for Measurement Range of Vibration due to Blasting of Underground Tunneling (발파 진동으로 인한 지표면 진동 계측 범위 산정에 대한 연구)

  • Kong, Suk-Min;Byun, Yoseph;Choi, Sang-Il;Kim, Jeong-Heum;Kim, Chang-Yong;Lee, Seong-Won
    • Journal of the Korean Geotechnical Society
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    • v.40 no.2
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    • pp.7-17
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    • 2024
  • Vibrations were measured at the surface of a GTX-A site to assess the impact of blasting on underground tunneling. A numerical analysis was conducted using the same ground and blast conditions as those at the site, accompanied by a comparative analysis of other GTX-A sites. This analysis determined the maximum vibration velocity at regular intervals directly above the blasting point at each site. The results were compared with domestic and international vibration standards to establish the vibration measurement range. The specified vibration measurement locations in domestic regulations—"measuring from the closest part of the structure's foundation to the blasting source, and if conditions make it impossible, measuring from the nearest surface to it"—were evaluated. Furthermore, this study underscores the significance of considering the tunnel drilling depth and soil conditions when selecting a vibration measurement location.

Data-driven Model Prediction of Harmful Cyanobacterial Blooms in the Nakdong River in Response to Increased Temperatures Under Climate Change Scenarios (기후변화 시나리오의 기온상승에 따른 낙동강 남세균 발생 예측을 위한 데이터 기반 모델 시뮬레이션)

  • Gayeon Jang;Minkyoung Jo;Jayun Kim;Sangjun Kim;Himchan Park;Joonhong Park
    • Journal of Korean Society on Water Environment
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    • v.40 no.3
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    • pp.121-129
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    • 2024
  • Harmful cyanobacterial blooms (HCBs) are caused by the rapid proliferation of cyanobacteria and are believed to be exacerbated by climate change. However, the extent to which HCBs will be stimulated in the future due to increased temperature remains uncertain. This study aims to predict the future occurrence of cyanobacteria in the Nakdong River, which has the highest incidence of HCBs in South Korea, based on temperature rise scenarios. Representative Concentration Pathways (RCPs) were used as the basis for these scenarios. Data-driven model simulations were conducted, and out of the four machine learning techniques tested (multiple linear regression, support vector regressor, decision tree, and random forest), the random forest model was selected for its relatively high prediction accuracy. The random forest model was used to predict the occurrence of cyanobacteria. The results of boxplot and time-series analyses showed that under the worst-case scenario (RCP8.5 (2100)), where temperature increases significantly, cyanobacterial abundance across all study areas was greatly stimulated. The study also found that the frequencies of HCB occurrences exceeding certain thresholds (100,000 and 1,000,000 cells/mL) increased under both the best-case scenario (RCP2.6 (2050)) and worst-case scenario (RCP8.5 (2100)). These findings suggest that the frequency of HCB occurrences surpassing a certain threshold level can serve as a useful diagnostic indicator of vulnerability to temperature increases caused by climate change. Additionally, this study highlights that water bodies currently susceptible to HCBs are likely to become even more vulnerable with climate change compared to those that are currently less susceptible.

A Study on the Civil Costumes Appeared on Dutch Paintings in the 17th Century (17세기(世紀) 네덜란드 회화(繪畵)에 나타난 시민복식(市民服飾)에 관(關)한 연구(硏究))

  • Yoo, Joo-Lee;Cho, Oh-Soon
    • Journal of Fashion Business
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    • v.3 no.2
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    • pp.37-47
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    • 1999
  • In the 17th century, Europe had changed from medieval feudalistic ages into an absolute monarchy taking Catholicism and absolute monarchism together. On the other hand, Holland achieved prosperity in economy, culture, and arts through gradual enlightment of the people by winning independence from Spain, and religious reformation. The culture dress and its ornaments at the time was led by the governing class such as royal families and its aristocracy in Europe, while Holland, united republic country at the time, brought civil costume nationwide wholly by civil class and its effect to other neighboring countries in Europe. In addition, the origin of modern dress and its ornaments dates back to that time. Moreover, civil-looking dutch paintings found its sources in routine daily life and became realistic. With this respect, in this research, we put our purpose of the research in making a better and more understanding of the modern costume and its ornaments and exploring the spirit of human beings by analyzing dutch civil costumes shown in these artistic works. It is very important that this research is rather renovational comparing with prior ones focused on those of ruling classes. As a result of the research, the distinguished parts of the civil costumes appeares as following beauties. First, functional beauty was respected such as natural waist line, peplum, gather of the skirt and sleeve, apron, head towel were some of the examples to those in their costumes and its ornaments. Second, with respect to humanity under rough natural surroundings and long struggle with outside tribes, humanity of costume was brought by optimistic and even free mind to them. The three quater sleeve showed wrist and deep-cut decollete in their dress and ornaments. Third, with respect to simplicity, religious effect on the leading civil class demanding self-abstinence, frugality, and thrift in their way of life resulted in black-tone simple costumes with white collar in their costumes and its ornaments.

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Development of Small HSSF Constructed Wetlands for treating NPS Pollution and connecting Green Ecosystem on a Bridge (연안역 교량의 녹색축 연결 및 교량 비점오염원 저감위한 소규모 HSSF 인공습지 개발)

  • Lee, Jeong-Young;Lee, So-Young;Marla, C.M.;Choi, Ji-Yeon;Kang, Chang-Guk;Joan, B.G.;Kim, Lee-Hyung
    • Proceedings of the KAIS Fall Conference
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    • 2009.12a
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    • pp.363-366
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    • 2009
  • 환경부는 2000년대에 들어 수질오염총량관리제의 정책 도입으로 하천과 호소의 수질개선에 노력을 기울이고 있으며, 개발사업과 관련된 비점오염원에서의 비점오염물질 관리를 요구하고 있다. 포장율이 높은 토지이용 변경사업, 즉 교량, 도로, 고속도로 등의 개발 사업은 특히 비점오염원 관리를 요구하고 있다. 그러나 현재 국내에 적용되고 있는 비점오염저감시설은 대부분 소규모 장치형 시설이며, 유지관리가 어렵고 저감효율이 낮은 단점이 있다. 최근에는 장치형 시설보다 생태친화적인 기능을 가지며 녹색 및 생태축 연결이 가능한 자연형 시설을 적용하는 방향으로 정책이 변화하고 있다. 이러한 조건과 더불어 기후변화에 능동적으로 대응하기 위해서는 교량의 경우 소규모 인공습지를 조성하여 녹색축 연결, 비점오염원 관리가 바람직하다. 따라서 본 연구는 도로와 교량의 녹색축을 연결하고 비점오염물질을 저감할 수 있는 소규모 HSSF 인공습지를 개발하고자 한다. 본 연구를 통해 개발된 소규모 HSSF 인공습지는 입자상 오염물질 제거를 위한 침강지, 용존성 및 미립자의 제거를 위한 습지부로 구성되어 있으며, 녹색축 및 생태공간 확보를 위한 습지의 식생부분이 존재하고 있다. 특히 본 기술은 교량내에서 처리하는 site control 방식으로 외부 유도를 통한 처리기술이 아니기에 비용경제적으로 효율성을 가지고 있다.

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The Current Status and Facilitation Strategy of BIM for Civil Infrastructure Projects (토목공사의 BIM 현황 및 활성화에 관한 연구)

  • Park, Tae-Soon;Park, Hee-Sung
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.38 no.1
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    • pp.133-140
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    • 2018
  • The purpose of this paper is to provide baseline on the current status and the activation of BIM in civil engineering which can integrate and manage the information and tasks generated during the life cycle. Hierarchical analysis was conducted to identify the level of BIM application, recognition survey for practitioners, and activation plans. The survey results show similar trends in BIM activation inhibition factor, the need for BIM, the effect of BIM and the future possibility of BIM. The utilization of BIM and the technical training in the civil engineering field were lower than those in the architectural field. The analysis of AHP(Analytic Hierarchy Process) is performed to identify the degree of importance in financial, operational, investment, technical, and institutional sections as its activating factors. As a result, the technical factor points the highest degree. Thus, study shows the direction to apply BIM in civil engineering in the future by suggesting an efficient plan.

The Conditions and Problems of Anti-Smoking Education Programs of Governmental Offices (전국 관청의 금연프로그램 실시 현황과 문제점)

  • Lee, Sang-Wook;Ohrr, Hee-Choul;Yi, Jee-Jeon;Kim, Tae-Wook;Huh, Nam-Uk
    • Korean Journal of Health Education and Promotion
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    • v.20 no.1
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    • pp.77-90
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    • 2003
  • The purpose of this study is to investigate the conditions and problems of anti-smoking education programs in government office for civil servants. A mail-in survey was carried out for the chief of the general affairs of 248 government offices. 1. There were 154 responses to the surveys. Only 34 governmental offices have carried out anti-smoking education programs for civil servants. 2. Only one office has a department to supervise and anti-smoking program. 17 offices have 1 worker and thirteen offices have no manpower to supervise anti-smoking program. 3. Only eight offices have budgeted for anti-smoking programs. The average budget was 3,750,000 Won. Expected budget for smoking cessation program was 7,500,000 Won. 4. 25 offices have an anti-smoking lecture program for civil servants. Only five offices have an anti-smoking counseling for smokers. 5. Only seven surveys responded that civil servants had a positive response to anti-smoking programs. 6. The most important problem of anti-smoking programs in governmental offices was the lack of concern of civil servants. Governmental offices have to provide the greatest administrative services and services concerning the quality of life for citizens. Anti-smoking education programs in governmental offices for civil servants was the beginning of an activity of the services concerning the quality of life for citizens. Governmental offices have to actively implement anti-smoking programs for civil servants.

Study on Wave Reduction and Beach sand Capture Performance of Artificial Coral Reefs for In-situ Application (해안침식 현장 적용을 위한 인공산호초 연성공법의 파고 감쇠 및 침식해빈사 포집성능 분석)

  • Hong, Sung-Hoon;Kim, Tae-Yoon;Choi, Yun-Shik;Kim, Jeong-Ho;Kwon, Yong-Ju;Lee, Si-Hyeon;Lee, Gwang-Soo;Kwon, Soon-Chul
    • Journal of Ocean Engineering and Technology
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    • v.32 no.6
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    • pp.485-491
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    • 2018
  • Because of the increase in coastal erosion problems, many studies have been conducted to prevent coastline retreat by developing low-cost, highly effective countermeasures. We developed the artificial coral reefs (ACRs) method as part of this research trend. To verify its coastal protection performance, we carried out performance tests on its wave attenuation and beach sand capture ability, which are the key barometers for this newly developed technology. In this study, three different types of methods, including natural beach, TTP, and ACRs, were used to determine the coastal protection efficiency under both ordinary and storm wave conditions. Based on the results of this study, ACRs were found to have the best wave attenuation performance and captured more than 20% of the total erosion area. This means the ACR method can be applied as a reliable countermeasure to protect a coastal zone.

Nonlinear Buckling Analysis of H-Type Honeycombed Composite Column with Rectangular Concrete-Filled Steel Tube Flanges

  • Ji, Jing;Xu, Zhichao;Jiang, Liangqin;Yuan, Chaoqing;Zhang, Yunfeng;Zhou, Lijian;Zhang, Shilong
    • International journal of steel structures
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    • v.18 no.4
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    • pp.1153-1166
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    • 2018
  • This paper was concerned with the nonlinear analysis on the overall stability of H-type honeycombed composite column with rectangular concrete-filled steel tube flanges (STHCC). The nonlinear analysis was performed using ABAQUS, a commercially available finite element (FE) program. Nonlinear buckling analysis was carried out by inducing the first buckling mode shape of the hinged column to the model as the initial imperfection with imperfection amplitude value of L/1000 and importing the simplified constitutive model of steel and nonlinear constitutive model of concrete considering hoop effect. Close agreement was shown between the experimental results of 17 concrete-filled steel tube (CFST) specimens and 4 I-beams with top flanges of rectangular concrete-filled steel tube (CFSFB) specimens conducted by former researchers and the predicted results, verifying the correctness of the method of FE analysis. Then, the FE models of 30 STHCC columns were established to investigate the influences of the concrete strength grade, the nominal slenderness ratio, the hoop coefficient and the flange width on the nonlinear stability capacity of SHTCC column. It was found that the hoop coefficient and the nominal slenderness ratio affected the nonlinear stability capacity more significantly. Based on the results of parameter analysis, a formula was proposed to predict the nonlinear stability capacity of STHCC column which laid the foundation of the application of STHCC column in practical engineering.