• Journal of the Computational Structural Engineering Institute of Korea
• /
• v.30 no.5
• /
• pp.397-404
• /
• 2017

The purpose of this study is to evaluate the seismic performance of Staggered Truss Frame(STF) system while changing a shape of truss. The model of this project is a office building of ten floors with Pratt, Howe, Warren, K and Vierendeel truss system applied on each model. Next step is to select the section of elements which satisfy the highest demand capacity ratio by structure design considering gravity load, earthquake load and wind load and then calculate natural period, base shear and story drifts. On the basis of these values, Capacity Spectrum Method(CSM) shows the plastic behavior of STF system such as performance point of Design Earthquake(DE) and Maximum Considered Earthquake(MCE), yield state, plastic hinge etc. to be compared with other truss systems. As a result, Vierendeel STF system especially was found to have the highest strength and stiffness to the corresponding earthquake and all the models for each truss shape fulfilled the target performance level.

• Fire Science and Engineering
• /
• v.24 no.4
• /
• pp.109-115
• /
• 2010

Maximum pressure difference in central core type 80th super_tall buildings was estimated as 75 Pa during no outside wind due to the winter stack effect. Maximum pressure difference of 225 Pa can be obtained depending on the location of air injection fan during the stairway pressurization at fire. Bottom_only air injection system provided the best results in the sense of required air flow rates and pressure distributions. Top_only air supply system was estimated as the worst for this country. It revealed that the decrease of the temperature in the stairway due to the cold outside air injection reduced the required flow rates of the fan and significantly changed the distribution of pressure differences.

• Journal of the Korea Organic Resources Recycling Association
• /
• v.22 no.3
• /
• pp.60-67
• /
• 2014

Exhaust system used in toilet and cooking place of high riser public house is roof fan of two basic types : natural roof ventilator and natural/forced roof ventilator. Natural/forced roof ventilator has a motor in the rotary shaft. There are many high riser public house in Korea. These buildings were not viewed as being major contributors to exhaust pollutants producted in indoor. It was because many engineers thought that exhaust in high riser building depend on stack effect. This study investigates on stack pressure determined by exterior pressure and the difference pressure control in exhaust stack used in high riser public house. This paper focuses mainly on the effect of the time interval for power supply of motor installed in roof fan with function of natural wind velocity and of exhaust air volume of toilet. It is observed there are higher exhaust efficiency than the existing natural roof ventilator.

• Journal of the Korea institute for structural maintenance and inspection
• /
• v.16 no.3
• /
• pp.128-137
• /
• 2012

In high multistory buildings, hybrid coupled shear walls can provide an efficient structural system to resist horizontal force due to wind and seismic loads. Hybrid coupled shear walls are usually built over the whole height of the building and are laid out either as a series of walls coupled by steel beams with openings to accommodate doors, elevator walls, windows and corridors. In this paper, the behavior characteristics of hybrid coupled shear wall system considering connection details is examined through results of an experimental research program where 5 two-thirds scale specimens were tested under cyclic loading. Such connections details are typically employed in hybrid coupling wall system consisting of steel coupling beams and reinforced concrete shear wall. The test variables of this study are embedment length of steel coupling beam and wall thickness of concrete shear wall. The results and discussion presented in this paper provide fundamental data for seismic behavior of hybrid coupled shear wall systems.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2017.05a
• /
• pp.452-455
• /
• 2017

As the number of high - rise buildings has increased recently, this research society has become interested in the method of cleaning the external wall required. When cleaning these areas, an accident occurs every year when a person uses dangerous manual labor using a gondola. The main goal of this work is to enable people to manipulate the robot with simple operation without dangerous manual operation when working in a vertical structure. As the altitude increases, the concept of the mechanism attaching to the vertical structure while enduring the external resistance in the increase of the wind strength is applied, and the additional attachment device is attached to the end of the leg based on the existing four- According to the control, the development result of the robot having the function of detachable to the glass is presented.

• KIEAE Journal
• /
• v.10 no.6
• /
• pp.73-80
• /
• 2010

Since the Korean War, Korea has experienced modernization. The population increase by baby booming has asked for more space for educational facilities. In such a situation, the purpose of educational facilities was to accommodate continuously increasing students, rather than seeking for quantitative demands. In addition, in accordance with social changes, educational shifts were required. After the revision of the seventh national curriculum in education in 1997, the school buildings became varied. The design of buildings in accordance with educational curriculum has been improved, but still lack of forming comfortable environment and considering energy efficiency in school buildings. For the improvement of educational environments, educational media such as TV and computers have been provided, and energy systems, including heating and cooling systems, has been continuously increased. As a result, it appeared that energy use in school buildings and facilities has been steadily increased and that the structure of energy consumption has been also changed, especially with regard to electricity use. Living in the 21st century, human beings face global environmental issues, such as global warming, geographical climate changes, and ozone destruction that are the consequences of fossil energy use. Therefore, even in industrial areas, considering a counterplan for low energy use is being paid attention. Starting with Kyoto Protocol in 1992, people try to decrease carbon dioxide and to develop alternative energies (i.e. natural energy); for example, solar energy, wind force, terrestrial heat, and water power. Advanced countries already set up a criterion for $CO_2$ decrease ranging from office buildings to residential houses and also propose alternatives for the $CO_2$ decrease. However, there is no such a plan for low energy use and $CO_2$ decrease in school facilities, and any research on the actual conditions was not accomplished. Thus, this study examines energy demand in classrooms that take up a large portion of energy demand in school building structure.

• Proceedings of KOSOMES biannual meeting
• /
• 2005.05a
• /
• pp.135-140
• /
• 2005

Currently, ECDIS and GPS plotters are much used as equipment providing operators with route information, but they do not have any function of automatic route creation and route explanation, so available for only experienced operators. Especially, the present situation is tint no study is made of the automatic route creation and route explanation using ENC for ECDIS, substitution system of paper chart. ENC is the electronic navigation chart that is produced using S-52, S-57 standard format required by IHQ. In this paper, an Vessel Operator Support System(VOSS) is proposed to generate an optimal route where ENC and GPS data is fusioned induding the wind direction and speed of an anemometer and tide data. The proposed system was testified by a simulation, and its effectiveness was verified.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• v.9 no.2
• /
• pp.159-163
• /
• 2005

Marine accidents of 70.9% have been caused by small ships less than 100 tons in the past 5 years(1998${\sim}$2002). This is ascribable to the graying and lack in expertise on shipping of small ship operators, and merchant ships are hindered from coastal navigation due to the increase of coastal fishing boats and liners. Currently, ECDIS and GPS Plotters are widely used as navigation equipment providing route information to operators, but it can not give any function of automatic route creation and route explanation, so they are available only experienced operators. Especially, the present situation is that no study is made of the automatic route creation and route explanation using ENC for ECDIS, substitution system of paper chart. In this paper, Navigation Guiding System(NGS) is proposed to generate an optimal route where ENC and GPS data is fusioned including the wind speed and direction of anemometer. The proposed system was testified by a simulation, and its effectiveness was verified.

• Korean Architects
• /
• s.475
• /
• pp.65-74
• /
• 2008

1970년 초에 배럴당 1불하던 원유가가 지금은 120불을 상회하고 있다. 더욱 놀라운 것은 3년 전만 하더라도 40불 이하 수준이던 것이 불과 몇 년 사이에 3배 이상 급등해 버린 것이다. 우리는 아직 유가 100불 이상의 고유가 시대에 대한 고통을 실감하지 못하고 있지만, 빠른 시일 안에 대항한 형태로 우리를 불편하게 하고, 더가서는 사회 경제 문화 등 모든 우리의 활동패턴에 근본적 변화를 일으킬 것이라는데는 어느 누구도 이의를 달지 못할 것이다. 한편 90년대만 하더라도 친환경 건축기술은 선택적 사양으로 인식되어 왔으며, 일부 고급건물 또는 데모성격의 건물에만 반영되던 미래의 기술 분야로 간주되어왔다. 하지만 10년 남짓 지난 지금 우리 주변에서 가장 흔하게 접할 수 있는 용어 중의 하나가 친환경, 지속가능, 그린, 에코 등 이며, 최근 많은 건설사가 고민하고 있는 가장 중요한 이슈가 친환경 건축 관련 기술이 되어버렸다. 최근 유가의 급등세 보다는 더디다 할 지라도 몇 년 사이에 벌어지고 있는 제도적, 사회 경제적 변화 동향을 돌이켜 볼 때 건축계 또한 매우 빠른 속도로 변해가고 있으며, 부지불시간에 유가등급과 같이 변화된 환경에 놀라는 시기가 곧 도래할 것이다. 오랜 기간 에너지 및 친환경 관련 요소기술의 개발, 정부의 지원제도 확대, 보급 강화 등 각종 노력을 통해 이제는 건축 설계분야에서도 친환경건축물에 대한 저변이 크게 확대되었다고 볼 수 있다. 하지만 실상 우리주변에서 제대로된 친환경 건축물을 실제로 보고자 한다면 두손으로 꼽기도 힘들 정도인 사실에 놀라게 될 것이다. 이러한 배경하에 이번 연재에서는 그동안 오랜기간 떠들고 노력했음에도 불구하고 실제 제대로된 친환경 건축물을 우리 주변에서 찾기 힘든 이유를 건축실무자 측면에서 재고해 보고, 이에 대한 새로운 해결방안을 모색해 보는 계기를 갖고자 한다. 특히 많은 친환경 건축기술 중 최근 선진국을 중심으로 가장 큰 이슈가 되어 있고, 또한 건축사 입장에서 쉽게 접근하기 어려운 기술분야인 신재생에너지 건축응용 측면에서 다양한 최신 기술 및 실질적 접근방법과 사례를 주제별로 제시하고자 한다.

• Journal of Navigation and Port Research
• /
• v.33 no.1
• /
• pp.35-41
• /
• 2009

A waypoint tracking algorithm(WTA) is designed for Unmanned Surface Vehicle(USV) in which water-jet system is installed for propulsion To control the heading of USV for waypoint tracking, the steering nozzle of water-jet need, to be controlled. Firstly, target heading is calculated by using the position information of waypoints input from the land control center. Secondly, the command for the steering nozzle of water-jet is calculated in real time by using the heading and the rate-of-turn( ROT) from magnetic compass, In this study, in order to consider the drift angle due to external disturbance such as wind and wave, the course of ground( COG) can be used instead of heading at higher speed than a certain value, To test the performance of newly-designed WTA, the tests were carried out in actual sea area near Gwang-an bridge of Busan. In this paper, the sea trial test results from WTA are analyzed and compared with those from manual control and those from commercial controller.