• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1998년도 하계학술대회 논문집 E
• /
• pp.1623-1625
• /
• 1998

At present, in case of circular conductor, various water blocking methods are in use for power cable. But, in case the shape of the conductor is sector shaped, segment conductor it was very difficult to make the water blocking segment conductor. This paper describes the developement details of the water blocking segment conductor applied with swellable powder.

• 국제학술발표논문집
• /
• The 6th International Conference on Construction Engineering and Project Management
• /
• pp.445-449
• /
• 2015

Construction industry is one of the most significant sector in national economic, but the portion of construction has been falling regularly with the regional development. In spite of decrease in economic portion, role of construction industry does not changed irrespective of development, as the foundation of development. To distinguish each state of the maturity, countries are grouped on GDP per capita, than compared with variance of GVA in construction and GFCF per GDP as level of construction industry. GVAc% and GFCF% shows corn-shaped plotting in increase of GDP per capita, and each value converge to around 20% and 5% as GDP per capita increase. The definition of maturity is consist of 4 stages; pre-developing, ascending, stabilization, and maturement. Maturity of construction industry is a term of broad sense of construction industry that is easily to figure current state of regional construction and shows what normal condition of construction is in regional economy.

• 아태비즈니스연구
• /
• 제12권1호
• /
• pp.209-223
• /
• 2021

Purpose - The purpose of this study was to investigate the relationship between Korea agricultural productions and Greenhouse Gas (GHG) emissions based on Environmental Kuznets Curve (EKC) hypothesis. Design/methodology/approach - This study utilized time series data of economic growth, greenhouse gas, agricultural productions, trade dependency, and energy usages. In order to econometric procedure of EKC hypothesis, this study utilized unit root test and cointegration test to check staionarity of each variable and also adopted Vector Error Correction Model (VECM) and Ordinary Least Square (OLS) to analyze the short and long run relationships. Findings - In the short run, greenhouse gas emissions resulting from economic growth show an inverse U-shape relationship, and an increase in agricultural production and energy consumption led to increase in greenhouse gas emission. In the long run, total GHG emissions and CO2 emissions show an N-shaped relationship with economic growth, and an increase in agricultural production has resulted in a decrease in total GHG and CO2 emissions. However, methane (CH4) and nitrous oxide (N2O) emissions showed an inverse U-shape relationship with economic growth, which indicated the environment and production process of agricultural production. Research implications or Originality - Korea agricultural production has different effects on the GHG emission sources, and in particular, methane (CH4) and nitrous oxide (N2O) emissions show to increase as the agricultural production expansions, so policy or technological development in related sector is required. Especially, in the context of the 2030 GHG reduction road-map, if GHG-related reduction technologies or policies are spread, national GHG emission reduction targets can be achieved and this is possible to predict the decline in production in the sector and damage to the related industries.

• 한국지역지리학회지
• /
• 제8권3호
• /
• pp.295-313
• /
• 2002

대구시의 성장은 토지구획정리사업, 공영개발사업, 도로망의 건설 등 공공정책을 통해 선도되었다. 반면, 산, 하천, 철도 등의 제약요인으로 대구시 성장패턴이 결정되었다. 대구는 조선시대 도시 발생기, 일제강점기 이후 도시기반 형성기, 1960년대 이후 산업화 시기의 도시성장기를 거쳐, 1980년 이후, 대규모 신시가지가 형성되어 현재 대구 도시공간의 기본골격을 형성함으로써, 도시의 팽창 성숙기에 들어서게 된다. 특히 1981년 대구직할시 승격에 따라 편입된 성서, 월배, 고산, 안심 및 칠곡 등 지역이 공영개발사업 방식을 동하여 고층아파트 중심적 고밀도 주거 신시가지로 조성되었다. 신시가지는 대구시 중심에서 대체로 $6km{\sim}7km$ 지점에 위치하고 있으며, 대구시 외곽 방향의 방사선 도로와 인접하여 개발되었다. 또한 대구시 제4차 순환도로의 계획노선이 통과하는 지점이 된다. 상인, 성서 및 지산 범물 신시가지는 기성시가지와 연속적으로 개발된 반면 서지는 개발제한구역, 칠곡은 금호강에 의해 분리 개발되었다.

• Ocean and Polar Research
• /
• 제27권3호
• /
• pp.277-288
• /
• 2005

Spatial distribution and vertical structures of water masses around the Antarctic continental margin are described using synthesized hydrographic data. Antarctic Surface Water (AASW) over the shelf regime is distinguished from underlying other water masses by the cut-off salinity, varying from approximately 34.35 to 34.45 around Antarctica. Shelf water, characterized by salinity greater than the cut-off salinity and potential temperature less than $-17^{\circ}C$, is observed on the Ross Sea, off George V Land, off Wilkes Land, the Amery Basin, and the Weddell Sea, but in some shelves AASW occupies the entire shelf. Lower Circumpolar Deep Water is present everywhere around the Antarctic oceanic regime and in some places it mixes with Shelf Water, producing Antarctic Slope Front Water (ASFW). ASFW, characterized by potential temperature less than about $0^{\circ}C$ and greater than $-17^{\circ}C$, and salinity greater than the cut-off salinity, is found everywhere around Antarctica except in the Bellingshausen-Amundsen sector. The presence of different water masses over the Antarctic shelves and shelf edges produces mainly three types of water mass stratifications: no significant meridional property gradient in the Bellingshausen and Amundsen Seas, single property gradient where ASFW presents, and a V-shaped front where Shelf Water exists.

• Advances in Energy Research
• /
• 제7권1호
• /
• pp.53-66
• /
• 2020

Before the industrial revolution architecture has been shaped by the natural and cultural inputs. Local constraints become more effective determinants of architecture in the rural contexts because by being disengaged from the webs of transportation and communication, rural settlements have achieved sustainability in difficult conditions. The examples of rural settlement and architecture have provided sustainability through integration with natural inputs within the geographical context because they have reached the goals of ecological design within the local constraints. Although this feature of the rural cultural landscapes has been emphasized frequently, tangible standards could not be developed in order to interpret their ecological design principles from the perspectives of the contemporary building sector and planning. However, the historical experience indicates that the sustenance of ecological performance can be possible as a result of integrated planning at the overall scale of the settlement. Therefore, the existing standards are not qualified for interpreting the rural contexts. This study develops a method for analysing, interpreting and evaluating traditional rural settlements and certifying new implementations in the rural environments in the light of the given literature review, discussion and methodological proposal.

• Wind and Structures
• /
• 제25권2호
• /
• pp.177-193
• /
• 2017

The accelerated development of new materials, technologies and construction processes, in parallel with advances in computational algorithms and ever growing computational power, is leading to more daring and innovative architectural and structural designs. The search for non-regular building shapes and slender structures, as alternative to the traditional architectural forms that have been prevailing in the building sector, poses important engineering challenges in the assessment of the strength and mechanical stability of non-conventional structures and systems, namely against highly variable actions as wind and seismic forces. In case of complex structures, laboratory experiments are a widely used methodology for strength assessment and loading characterization. Nevertheless, powerful numerical tools providing reliable results are also available today and able to compete with the experimental approach. In this paper the wind action on a free-form complex thin shell is investigated through 3D-CFD simulation in terms of the pressure coefficients and global forces generated. All the modelling aspects and calibrating process are described. The results obtained showed that the CFD technique is effective in the study of the wind effects on complex-shaped structures.

• 한국생활과학회지
• /
• 제13권1호
• /
• pp.1-16
• /
• 2004

The purpose of this study was to examine the self-regulation in E-commerce business and review the major issues of self-regulation in several countries. This paper reviewed the legislation for the self regulation of APEC, OECD and EC, and introduced the regulation system for several countries, such as U.S. U.K and Japan. Also, we analyzed the current issues and problems of self-regulation in Korea and tried to suggest the future direction. There were three different regulations such as market forces, government regulation and self-regulation and the model of self-regulations were shaped in various types. Even though the government made the standard regulations for business sector but it was impossible to direct individual firms and their compliance of those regulations. To compensate the government regulation, the self regulation with low cost is needed and also two kinds of regulations has to be unified to enhance the regulation system in E-commerce. Industries should participate for the regulation voluntarily and consumers must give an award of legislation for self-regulation to motivate the self-regulations of industries.

• The Journal of Asian Finance, Economics and Business
• /
• 제7권8호
• /
• pp.161-173
• /
• 2020

This study examines the nonlinear relationship between financial development and economic growth in Pakistan using the threshold regression model for the period 1980-2017. We also employed quantile regression with 0.25, 0.50, and 0.75 quantiles of conditional distribution. The quantile regression is based on minimizing of sum of squared residuals. The result indicates that economic growth responds positively to financial development when the level of financial development surpasses the threshold value of 0.151. However, when financial development lies below the threshold value (that is, 0.151), its impact on economic growth is negative. Thus, when financial development of Pakistan surpasses the threshold level, it contributes more towards economic growth since greater level of financial development contributes more to boosts economic growth. This finding reveals that economic growth reacts differently to financial development, and the relationship between financial development and economic growth is U-shaped in Pakistan. Among the other variables, physical capital, labor force, and government expenditure exert a positive effect on economic growth. Furthermore, inflation rate and trade openness have an insignificant impact on economic growth. The results of quantile regression also confirm the non-linear relationship between financial development and economic growth in Pakistan. The finding of this study suggests revamping of financial sector policies in Pakistan.

• 대한기계학회논문집
• /
• 제12권5호
• /
• pp.1063-1070
• /
• 1988

본 연구에서는 부채꼴형 유한폭 패드베어링에서의 선단압력을 구하기 위하여 3차원 유동모델을 제시하였으며, 이 유동모델을 기초로 하여 구해진 선단압력을 패드 선단에서의 압력경계조건으로 사용하여 유막내의 압력을 구하고 베어링의 하중지지능 력, 마찰토오크 및 윤활유량등을 계산함으로써 베어링의 성능을 해석하였다. 그 결 과 선단 압력이 크게 발생하는 운전조건일수록 선단압력을 무시한 종래의 베어링 성능 해석결과와는 상당한 차이가 있었으며, 특히 관성계수가 큰 운전조건에서 사용되는 피 봇식 추력베어링에서는 선단압력의 영향으로 인하여 하중지지능력을 최대로하는 피봇 점의 위치가 패드 선단부쪽으로 크게 이동되었다.