• International Journal of Railway
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• 제6권3호
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• pp.95-106
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• 2013

Earthborne vibrations are induced by construction operation such as pile driving, roadbed compaction, and blasting and also by transit activities such as truck and trains. The earthborne vibration creates the stress waves traveling outward from the source and can structurally damage nearby buildings and structures in the forms of direct damage to structure and damage due to dynamic settlement. The wave propagation characteristics depends on impact or vibration energy, distance from the source, and soil characteristics. The aim of this paper is to provide a comprehensive review on the mechanistic of earthborne vibration and the current practice of vibration control and mitigation measures. The paper describes the state of knowledge in the areas of: (1) mechanics of earthborne vibration, (2) damage mechanism by earthborne vibration, (3) calculation, prediction of ground vibration, (4) the criteria of vibration limits, (5) vibration mitigation measures and their performance, and (6) the current practice of vibration control and mitigation measures.

• Environmental Engineering Research
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• 제15권1호
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• pp.29-33
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• 2010

In 2004, the Korean government launched comprehensive measures for nonpoint pollution that were intended to reduce their amount by 34.3% over of those forecast by 2020. During the first and second stages of their implementation; from 2004 to 2011, nonpoint source (NPS) measures have focused on systemic improvements and project management, as well as the introduction of optimal management techniques; accordingly, reductions have been small. However, during the third stage in 2011, serious reductions will be pursued. Accordingly, the gradual expansion of sites subject to NPS measures has focused on the establishment of a basis for reduction measures in connection with model projects during the first half of the plan, with full scale enforcement due in the second half. For Korea, rather than commencing NPS management en masse, it has been more appropriate to gradate NPS management into stages tailored to the different needs of new and existing businesses, as well as to the needs of large and small-scale businesses, in consideration of their specific circumstances. This has allowed sufficient time for such businesses to become accustomed to the concept of NPS management.

• Structural Engineering and Mechanics
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• 제66권6호
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• pp.749-759
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• 2018

Aiming at widely used high-pier bridges in Sichuan-Tibet Railway, this paper presents an investigation to design and evaluate the seismic vibration reduction effects of several measures, including viscous damper (VD), friction pendulum bearing (FPB), and tuned mass damper (TMD). Primarily, according to the detailed introduction of the concerned bridge structure, dynamic models of high-pier bridges with different seismic vibration reduction (SVR) measures are established. Further, the designs for these SVR measures are performed, and the optimal parameters of these measures are investigated. On this basis, the vibration reduction effects of these measures are analyzed and assessed subject to actual earthquake excitations in Wenchuan Earthquake (M=8.0), and the most appropriate SVR measure for high-pier bridges in Sichuan-Tibet Railway is determined at the end of the work. Results show that the height of pier does not obviously affect the performances of the concerned SVR measures. Comprehensively considering the vibration absorption performance, installation and maintenance of all the employed measures in this paper, TMD is the best one to absorb vibrations induced by earthquakes.

• 대한토목학회논문집
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• 제44권5호
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• pp.683-694
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• 2024

유역에서 홍수조절 능력 증대 방안은 크게 구조적 대책과 비구조적 대책으로 구분될 수 있다. 본 연구에서는 섬진강유역 홍수조절능력 제고를 위해 비구조적 대책으로 섬진강댐 운영체제의 개선, 특히 홍수기 탄력(가변)제한수위의 도입을 제안하였다. 홍수기 제한수위의 탄력적인 운영이란 홍수기 초에는 제한수위를 낮게 설정함으로써 홍수조절용량을 증대되도록 하고 홍수기가 경과함에 따라 이를 높여 운영함으로써 댐의 홍수조절을 보다 효과적으로 하는 것이다. 구조적 대책으로는 자연기반해법(NbS)의 대표기법인 천변저류지 설치를 검토하였다. 2020년 홍수사상을 기반으로 구조적/비구조적 대책을 각각 시행했을 때와 두 대책을 동시에 시행했을 때 홍수위 저감을 분석하여 가장 효과적이고 경제적인 방안을 도출하였다. 그 결과 비구조적대책으로 홍수기 중반 섬진강댐 제한수위를 EL. 190 m로 운영하고, 구조적 대책으로 저류지를 고달교 하류 곡성군 대평리에 설치하는 것이 2020년 홍수사상시 섬진강 본류의 홍수피해예방의 최적 방안이라 검토되었다.

• 수산해양기술연구
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• 제26권4호
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• pp.341-352
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• 1990

The purpose of this research is to develop the design/control method that can be used for the improvement of harbour tranquility and water quality of fishing ports. For this end, firstly, the hydraulic environmental characteristics of fishing ports in the coastal waters of the Korean Peninsula are analysed and discussed combined with disasters of facilities and vessels in the ports. Secondly the problems of water quality control is pointed out considered with the improvement measures of harbour tranquility such as the methods of lengthen of main breakwaters and construction of wave absorbing structures. Finally, the control characteristics of composite functions of water quality and tranquility of fishing port are discussed and the improved control method si proposed using the experimental results for the various measures. The proposed measure is proved to be a applicable method to improve these two main functions on the design of fishing port.

• Asian Pacific Journal of Cancer Prevention
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• 제15권24호
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• pp.10991-10992
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• 2015

Tobacco is a well known cause of death worldwide. With existing comprehensive laws and various other measures for tobacco control, the mortality and morbidity due to tobacco usage have unfortunately not been reduced. A large number of tobacco users have altered their pattern of tobacco use after the gutka ban. Traditional gutka is sold in the open market in a pre-mixed format. Manufacturers are supplying pan masala and tobacco in separate pouches as there is no restriction for sale of pan masala and tobacco individually in many states. Although most of the population is aware of the health hazards of tobacco, it is necessary to develop an effective structured strategy. Tobacco control programs need to be strengthened by separate tobacco control measures at various levels.

• 산업경영시스템학회지
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• 제24권63호
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• pp.45-54
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• 2001

The process capability indices have been widely used in manufacturing industries to provide numerical measures of process potential and performance. This study is concerned with process controls and adjustments by incapability index $C_{pp}$ and its sub-indices. A monitoring for $\^{C}_{pp}$ would provide a convenient way to monitor changes on process capability after statistical control is established, since $C_{pp}$ simultaneously measures process variability and centering. Further, we can separate charting of process location and variability by sub-indices of $C_{pp}$, ($C_{ia}$, $C_{ip}$), without returning to $\={x}$-R chart, even though an out-of-control signals on $\^{C}_{pp}$ control chart is found.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.548-548
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• 2000

This paper measures and compares time delays between CORBA, DCOM, TSpaces Objects designed for distributed control systems. To compare time delay for each object, this paper implements the ball and beam control system. And the reasons of delay have been studied.

• 한국인구학
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• 제11권1호
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• pp.117-130
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• 1988

Though most of East European coutries seem to hold a pronatalist policy, they approve of family planning and provide contraceptive services. One of the most popular contraceptive method has traditionally been the coitus interruptus in these countries. One of the major reasons for adopting family planning is to decrease the incidence of induced abortion has been closely related to the popular use of coitus interruptus in these countries. Most of the East European countries liberalized induce abortion legally mainly to neutralize the wide practice of illegal abortion. However, the practice of induced abortion is under the strict control of the public health authorities in these countries. Migration and redistribution of population of population are mostly under the control of the state in these socialist countries. Policies on migration and redistribution are usually carried out to achieve the general goal of socio-economic development plan of the states. Both incentive measures and control measures are mobilized to affect the internal migration and redistribution of population. With respect to public health East European countries are characterized by the socialized medicine following the Soviet model. Public health measures and medical practice are controlled by the state and highly centralized in many countries except Yugoslavia. They place much emphasis on preventive medicine, primary health care, occupatinal and industrial medicine, and health education. Private sectors in medical practice do not exist in these countries of Eastern Europe.

• 기본간호학회지
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• 제19권1호
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• pp.122-133
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• 2012

Purpose: The purpose of this study was to develop a web-based education program on control vancomycin-resistant enterococci (VRE) infections and to identify the effects of the program on knowledge and performance of nursing students. Methods: The web-based VRE infection control education program was developed by using the network-based instructional systems design model. The nursing students in the experimental group could access this web-based education program at any time, and as many times as they wanted, during the clinical training period. Effects were evaluated by assessing knowledge and performance of VRE infection control measures during the clinical training period. Results: The contents of the education program included diagnosis, transmission, and treatment of VRE, contact precautions, hand washing, personal protective equipment, environment management, and quizzes. The lecture portion was filmed in a virtual screen studio using flash animation, video, and sound effects, and it was uploaded on an internet site. The knowledge and performance scores of the experimental group after using the education program were significantly higher than those of the control group. Conclusion: The results suggest that the web-based VRE infection control education program is an effective educational method to enhance knowledge and performance of VRE infection control measures.