본 프로젝트는 목포의 대표 관광지이자 시민들의 수변공원이기도 한 평화광장에서 현재 제기되고 있는 이용 및 구조적 문제점 해결을 포함한 리모델링 계획방향 제시를 목적으로 진행된 것이다. 평화광장의 최우선 과제인 공간 구조개선을 위해 ‘보차도 및 녹지 공간조정을 통한 무장애 거리 조성’ 을 목표로 설정하고 구체적인 해결방안을 도출하였다. 광장과 수변을 단절시키는 차도 폐지, 보차도의 높이차 조정 그리고 차량동선 변경으로 수요부족이 예상되는 주차공간확보 등이다. 다음 단계로 대상지역 전체에 대한 리모델링 계획을 추진했다. 대상지의 역사성 및 위치특성을 살려 특화된 4개의 존(zone)으로 구분하고, 서로 다른 역할 및 기능을 부여하는 공간으로 계획하였다. 중심상징 존, 체험 및 동적활동 존, 역사 및 지역문화예술 존, 인접 도시 연계 존 등을 제안하였다. 본 연구대상지인 평화광장은 20년 전 조성되어 현재까지도 많은 사람이 이용하고 있는 공간으로, 당초 시에서는 차도폐지 및 바닥포장 개선이라는 토목사업의 성격으로 추진하고자 했던 사업이었다. 이러한 움직임에 대해 지역 연구자들이 의견을 모아 공간 구조개선 제안 및 광장과 수변공간 전체에 대한 통합적인 리모델링 계획추진을 건의한 결과, 당초의 사업범위를 확대시켜 진행된 프로젝트이다. 따라서 1단계로 목포시의 당면과제를 전제조건으로 우선 해결한 후, 2단계 통상적인 리모델링 계획을 수립하는 방식으로 진행하였다. 단순한 방식의 공사에 불과했던 토목사업을, 사전 제안을 통해 종합프로젝트 방식의 리모델링 사업으로 이끌어냈다는 점에서 본 연구는 의미있는 작업이 되었다.

This study is carried out on the structural improvement of military mobile kitchen trailer for the betterment of fighting power by serving meals to solider in right time. To recognize the real problems of field kitchen trailer, the heat transfers from burner for soup cooker were compared with each other. By the test, the necessity of improvement was deduced. To examine the cause of cooking time, it was determined by the characteristic diagram. Based on the cause, there are two types of kitchen trailer's burner structures. To verify the improved structures, it was carried out for the performance test. As the results, the time did not become longer and the temperature rising rate per minute increased. This study is expected to be devoted to the future improvement of military mobile kitchen trailer.

In the current steel structures of high-rise buildings, high heat input welding techniques are used to improve productivity in the construction industry. Under the high heat input welding, however, the microstructures of the weld metal (WM) and heat-affected zone (HAZ) coarsen, resulting in the deterioration of impact toughness. This study focuses mainly on the effects of fine TiN precipitates dispersed in steel plates and B addition in welding materials on grain refinement of the HAZ microstructure under submerged arc welding (SAW) with a high heat input of 200 kJ/cm. The study reveals that, different from that in conventional steel, the γ grain coarsening is notably retarded in the coarse grain HAZ (CGHAZ) of a newly developed steel with TiN precipitates below 70 nm in size even under the high heat input welding, and the refinement of HAZ microstructure is confirmed to have improved impact toughness. Furthermore, energy dispersive spectroscopy (EDS) and secondary-ion mass spectrometry (SIMS) analyses demonstrate that B is was identified at the interface of TiN in CGHAZ. It is likely that B atoms in the WM are diffused to CGHAZ and are segregated at the outer part of undissolved TiN, which contributes partly to a further grain refinement, and consequently, improved mechanical properties are achieved.

Among the soft ground improvement methods, PBD is the most common construction method because it is cheap and construction is fast. However, if the ground is rigid, additional work is required. In this study, the structural safety, natural vibration, and safety angle of the steel vertical tower structure were evaluated in the development of the PBD composite perforator which can be combined with drilling work and PBD construction. Structural safety was assessed when the wind load of 20 m/s was simultaneously applied to the PBD construction load of 20 tons, the perforating operation of 25 tons, and the wind speed of 50 m/s was applied only to the wind load. The natural frequencies were evaluated up to the sixth mode, and the safety angle was evaluated for static and dynamic safety angles.

Owing to the development in information and communications technologies have improved the technology for high-speed transmission of massive data, which has changed closed-circuit television (CCTV) video transmission technology. In particular, digitization of the CCTV video format and streaming technology has made it possible to minimize transmission loss and integrate video transmission and camera control(pan/tilt). It has also become possible to provide additional services like remote emergency warning broadcasting with just Internet Protocol (IP). However, because of the structural problems of IP, these changes have also brought about the threat of hacking of CCTV monitoring systems. In this study, we propose a methode to optimize network management by examining cases of enhancement of operational efficiency and security by improving the structure of CCTV monitoring network.

The findings were summarized as follows. The safety check by manufacturer showed that 6 of 13 companies are over the average occurrence of defects. It was expected that there would be a difference between manufacturing technology capability and production system of each manufacturer. Consequently, manufacturers should institutionally improve and strengthen certification items for the upward standardization of safety certification before factory. Second, the safety check by year showed that the results of this study accord with those of previous studies on defect time. Consequently, manufacturers should classify the 3-year-old equipment for vehicle-mounted MEWP into a special check subject to do a nondestructive test according to proven results, and also reflect the test in a safety test system to do regular preventive activities of equipment defects. Third, the safety check by part showed that the boom and outrigger parts of vehicle-mounted MEWP have the most defects. Stress concentration resulted in defects as the boom part was most frequently operated in the structural parts for a real work. To prevent this, it is suitable to improve the hardness of boom materials. The outrigger part needs improvement in safety devices with materials. As an outrigger supports the overturning moment of equipment, it is most affected by its load based on the operating radius, resulting in fatigue crack.

Shelter that communication equipment and on-equipment material are mounted on is transported by airplane or vehicle, it has a function such as waterproof and shielding EMI. When the shelter is transported by car or helicopter, it is shocked by vibration and crash with the ground. So, three skids are attached to bottom of the shelter to reduce the shock. To confirm the durability of the structure of shelter, parallel drop and rotating drop test were done in accordance with KDS 0000-0000. However, the damage was discovered in the shelter. So, stiffening plate was added to skid and panel of partition wall to obtain durability and changed the shape of rubber buffer. In this paper, the cause of deformation and damage in the shelter was analyzed and improved shape through the structural analysis was verified.

The finite element analysis of large sized rectangular water tank structures made of stainless steel materials is carried out for various combined load cases. The combined load cases for a large size of 5,000ton are further determined using the specification(KS B　6283) established from the Korean Standards Association. For the better numerical efficiency, the rectangular panels are modelled using the ANSYS program. The numerical results obtained for different load cases show as follows. In order to resist the snow load, it takes the influence of the gap than the size of the column. Also, in order to resist the water pressure, it shall increase the thickness of the wall. But, increasing the thickness of the wall is considerably less economical. Therefore, the angle with big thickness should be placed right next to the wall.

This study on Structural analysis of kickboard used two types suspension systems. Kickboard is very dangerous in rider because of unstable in diving conditions. Thus suspension system of kickboard are very important component parts. This study focus on two suspensions for stability in kickboard which coil spring and aluminium leaf spring.

Generally, the Load of upper structures is transferred to concrete foundations through columns supporting them. So, the anchor connection system is usually adopted in order to connect the columns and the concrete foundations. To apply this system, the column-foundation connections need to be designed with enough stiffness. This study was experimentally conducted to effectively improve the structural detail of circular CFT column-foundation connections, to which axial and lateral load simultaneously apply. For this study, the test specimen with a general anchor and an anchor frame, and the specimens with the high-tension bolt and inner reinforcement were fabricated. In addition, double base plates were adopted to have the enough stiffness of connections. The behavioral characteristics and the failure mode were investigated and compared, and the improvement of structural detail of circular CFT column-foundation connections was suggested.

In recent years, technology has been developed the way the volume of the portable communication device is reduced but its performance is maintained. The COF(Chip On Film) packaging method is used due to the densification of the lead pitch, especially for the display driver IC. During COF packaging, lead break and film detachment could occur by the high bonding temperature and pressure, and possibility for lead interference can emerge by deformation of leads. In this study, a new double-column arrangement of leads is considered to increase lead density further than the existing zigzag arrangement of leads, and nonlinear structural analysis was carried out to examine whether the interference can occur. The results showed that stress and deformation of the corner region appear relatively higher than those of central region, and interference did not occur by the lead strain for the double-column arrangement of leads with pitch of 25μm. Therefore, double-column lead arrangement can improve lead density by about 176% compared to the zigzag lead arrangement

본 연구는 도로안전 시설물의 풍하중에 의한 손상발생 사례를 토대로 현행 도로안전 시설물의 구조적 휨 성능을 평가하고 이에 대한 부재별 휨 성능개선을 위한 연구이다. 본 연구의 대상구조물로는 대표적인 도로안전시설물이며 풍하중에 대한 선행 피해사례가 밝혀진 방음벽 지주프레임을 대상으로 고려하였으며 이들 지주프레임의 휨 구조성능 및 형상설계에 대한 평가를 우선적으로 수행하였다. 본 연구평가 결과에서 나타난 현행 보강재의 구조적 성능을 토대로 중량 대비 구조적 강성이 우수한 유리섬유 강화플라스틱 (GFRP)을 활용하여 다양한 보강 형태에 따른 성능개선방법을 해석 및 실험적 연구를 통하여 수행하였다. 그 결과 효율적 성능개선을 위한 GFRP 적용방법의 경우 구조적, 시공적 측면에서 효율적인 것으로 평가되었고 자체적인 형상단면 최적설계를 통한 개선방법도 성능보강에 효과적인 것으로 해석적으로 평가되었다. 본 연구에서 적용된 GFRP 단면보강 및 최적형상설계 연구는 향후 노후 도로안전 시설물의 풍하중 또는 태풍으로 인한 피해예방을 위한 기초자료로서 효율적으로 활용될 수 있을 것으로 판단된다.

본 연구는 전원지 역 인 양구군을 대상으로 녹지 면적 및 식생구조 중심의 녹지구조를 정량 분석하고, 녹지에 대한 주민태도의 설문조사를 병행하여 녹지기능을 증진할 개선방안을 제시하였다. 수목피도는 공원이 약 29%로서 녹지공간 유형 중 가장높았고, 상업지 정원이 가장 낮아 3%에 불과하였다. 양구 전원지역의 수목식재는 개발밀도가 높은 도시의 경우보다 더 빈약하였다. 교목의 흉고직경분포는 20cm 미만의 점유비가 전체의 91%로서 도시지 역과 유사하게 유목 및 성장과정의 수목들이 우점하였다. 식재수종들의 상대우점치를 분석한 결과, 상위권 10개 수종 중4개 수종은 도시에서도 상위 10위권 내인 주요 도시경관수종들이었으며, 일부 우점종만 도시지 역과 상이하였다. 한편, 주거지 및 상업지 정원에선 우점종 대부분이 유실수로서 주로 실용적 수종을 식재한 것으로 나타났다. 녹지면적의 점유비는 공원 약 69%, 주거지 정원 39%, 공공용지 정원 37%, 가로 24%, 상업지 정원 15%등이었다. 향후 수목을 식재할 수 있는 잠재식재공간은 가로가 37%로서 현 수목피도를 약 6배, 주거지와 상업지 정원이 각각 19%,7%로서 현 수목피도를 2배이상 증진할 수 있을 것으로 분석되었다 녹지구조와 식재기법, 설문조사분석결과에 근거한 녹지확충 및 기능 개선책은 가로 구간별 테마 창출, 다층구조 조성, 정원 나지에 수목식재 및 건물 주변 에너지 절약적 식재 추진 등으로 요약된다.

This study is a method to improve the reliability and effectivity of maintenance. It is necessary to build the integrated management system of BIM throughout the design, construction and maintenance of the structure. In order to apply BIM, it was introduced structural record management from the design stage. And It helps to improve the reliability of maintenance.

This study found that National Recreation Forest Management Office has a financial issue throughout the analysis of Sanlim 3.0, Big data. Most of profit, over 90%, were from accommodations. This situation can cause financial aggravation. In this study, benefits of the sixth industry were examined to find out if it can be used for the improvement of profit structure of recreational forest. User behavior studies were also examined and summarized to find out visitors’ purposes and references within recreational forest. Visitors had two main purposes and references: 1. rest and recreation, and 2. promotion of health. Therefore, healing industry and Korea traditional charcoal kiln are selected to integrate them into the forest sixth industrialization. Waste wood would be used as resources for traditional charcoal making process. Traditional charcoal kiln would be constructed with Jjimjilbang to produce traditional charcoals for sale and provide a natural sauna in recreational forest. The road map of forest sixth industry would help to improve financial profit structure and to revitalize local community.

Improvement of displacement absorbing performance by utilizing the moving clips in order to prevent falling off of the exterior material according to earthquakes and wind, trying to examine the structural performance of the building exterior panel.