This study highlights the theme of safety leadership in railway organization, conducting empirical analysis on the relationship between safety climates, safety leadership, safety behavior, and accident. The empirical test results based on questionnaires received from 223 train drivers working at A subway firm indicated that relationship between CEO's safety philosophy, and safety communication showed a significant positive effect on boss's safety leadership. And boss's safety leadership showed a positive influence on observation belonging to safety behavior, which in turn showed a significant negative relationship with mistake. However, mistake, observation and violation were shown that there are no relationship with accidents.

Spatial Structure has suffered from a lot of damage due to the use of lightweight roofs. Among them, the damage caused by strong winds was the greatest, and the failure of the calculation of the wind load was the most frequent cause. It provides that wind tunnel test is used to calculate the wind load. However, it is often the case that the wind load is calculated based on the standard of wind load in the development design stage. Therefore based on this, the structure type and structural system and member design are often determined. Spatial structure is usually open at a certain area. The retractable roof structure should be operated with the open roof in some cases, so the wind load for the open shape should be considered, but it is not clear on the basis of the wind load standard. In this paper, the design wind pressure of a closed and retractable roof structure is calculated by KBC2016, AIJ2004, ASCE7-10, EN2005, and the applicability of wind pressure coefficient is compared with wind tunnel test.

Wireless MEMS sensors have common features such as wireless communication, data measurement, embedded processing, battery-based self-power, and low cost, and increased measurement effectiveness. Wireless MEMS sensors enable efficient SHM without interfering with location because there is no requirement for triboelectric noise and cumbersome cables. However, there is little research on the communication distance with sensors and data. For instance, existing researches have limited communication distance experiments in civil engineering bridges. It is also necessary to investigate the characteristics of dynamic behavior and the communication distance of architectural structures with different wireless transmission/reception environments. Therefore, in a building structure with walls and slabs instead of open spaces, MEMS sensors and data loggers were used as distance experiments where communication disturbance between the vertical slab and the horizontal wall could actually be communicated.

As an alternative to coupling beam in shear wall system, application of the damper which can dissipate energy is increasing. In this study, lintel beam type steel damper which is simple to construct and change depending on design load was proposed. Cyclic loading test was conducted to compare reinforced concrete coupling beam and lintel beam type steel damper. The test results showed that lintel beam type steel damper has higher initial stiffness and energy dissipation capacity than reinforced concrete coupling beam.

본 논문은 자끄 라깡의 정신분석학 담론을 준거의 틀로 삼아 인간의 욕망구 조를 분석해 보고자 한다. 라깡은 정신분석학을 인간의 욕망과 주체에 관한 학 문으로 정립시켰다. 라깡의 이론에서 욕망과 주체, 대상 ‘a’의 관계는 상상계, 상징계, 실재계의 틀 안에서 뫼비우스의 띠처럼 얽혀 서로를 구속한다. 라깡의 욕망은 언어적 주체의 분열에 의해 욕구와 요구의 빈틈에 의해 생겨난 비언어 적 상징이며, 그 의미화를 통해 주체에게 욕망을 되돌리고, 주체로 하여금 무언 의 욕망하는 거래를 상상하게 만드는 초월화된 기표이다. 그것은 스스로 움직이 면서 모든 의미화 과정(signifying chain)을 움직이는 무엇이다. 인간의 가장 심 오한 차원을 여는 욕망은 언어의 무한한 연쇄 과정 속을 부유하며 완전한 존재 가 되기 위하여 갖추어져야 할, 그러나 항상 결핍되어져 있는, 기표를 움직이는 힘이며 언제 어디서나 쉬지 않고 움직이는 삶의 동력인 것이다. 항상 상징적 구 조를 띠고 작동하는 욕망은 파괴할 수 없으며 욕구에 의해 영향 받지 않는다. 따라서 라깡의 사유체계에서 인간의 욕망은 모든 것에 내재된 초월적 에너지의 의미에서 신적 조망을 공유한다.

PURPOSES: In this study, a three-dimensional nonlinear finite element analysis (FEA) model for airport concrete pavement was developed using the commercial program ABAQUS. Users can select an analysis method and set the range of input parameters to reflect actual conditions such as environmental loading.METHODS : The geometrical shape of the FEA model was chosen by considering the concrete pavement located in the third-stage construction site of Incheon International Airport. Incompatible eight-node elements were used for the FEA model. Laboratory test results for the concrete specimens fabricated at the construction site were used as material properties of the concrete slab. The material properties of the cement-treated base suggested by the Federal Aviation Administration(FAA) manual were used as those of the lean concrete subbase. In addition, preceding studies and pavement evaluation reports of Incheon International Airport were referred for the material properties of asphalt base and subgrade. The kinetic friction coefficient between the concrete slab and asphalt base acquired from a preceding study was used for the friction coefficient between the layers. A nonlinear temperature gradient according to slab depth was used as an input parameter of environmental loading, and a quasistatic method was used to analyze traffic loading. The average load transfer efficiency obtained from an Heavy falling Weight Deflectomete(HWD) test was converted to a spring constant between adjacent slabs to be used as an input parameter. The reliability of the FEA model developed in this study was verified by comparing its analysis results to those of the FEAFAA model.RESULTS : A series of analyses were performed for environmental loading, traffic loading, and combined loading by using both the model developed in this study and the FEAFAA model under the same conditions. The stresses of the concrete slab obtained by both analysis models were almost the same. An HWD test was simulated and analyzed using the FEA model developed in this study. As a result, the actual deflections at the center, mid-edge, and corner of the slab caused by the HWD loading were similar to those obtained by the analysis.CONCLUSIONS : The FEA model developed in this study was judged to be utilized sufficiently in the prediction of behavior of airport concrete pavement.

One of the reasons why Louis I. Kahn is regarded as a pioneer of Post-Modern Architecture is that his works are interpreted as Structuralism and Post-structuralism in architecture. A. Lüchinger’s interpretation of Structuralism and M. Benedikt’s interpretation of Post-structuralism; especially Deconstruction Theory, in Kahn’s architecture must be proper cases for understanding this context. However, when we precisely analyze their insistence, several fallacies can be found with their incomplete grasp of Kahn’s architectural thinking. The most problematic thing is that they maximize fallibility with focusing only on the analysis of superficial phenomenon, such as formal composition, disposition of space, decorative features, and so on. Therefore, the meaning of architectural essence toward Post-Modern Architecture which Kahn had pursued during his lifetime is sometimes misinterpreted. For this reason, this paper attempt to reanalyze Kahn’s philosophy of architecture deeply with the view of aesthetics which has a key role in both overcoming their fallacies and illuminating the potentiality of Kahn’s architecture.

본 연구에서는 SiO2 나노파티클-전도성 고분자 PEDOT:PSS 복합 구조 기반의 유기발광다이오 드용 내부 광추출 구조를 간단한 용액 공정으로 제작하였다. 또한, 다양한 농도의 SiO2 나노파티클을 PEDOT:PSS에 분산하여 그 구조를 확인하였고, 상부/하부 버퍼레이어의 도입이 내부 광추출 구조 형성에 미치는 영향에 관하여 알아보았다.

광중합 방법을 이용하여 고리화 중합이 가능한 디알릴 기를 포함하는 액정 단량체를 합성하였고 이를 이용하여 액정의 상전이 특성 및 배향특성과 중합거동에 대하여 연구하였다. 액정단량체는 2-methyl-1,4-phenylene 기를 중 심구조로 하며 양 말단에 고리화 중합이 가능한 1,6-heptadienyl 기를 포함한다. 합성된 액정단량체를 1H-NMR로 구 조 분석을 하였으며 DSC와 POM을 이용하여 액정단량체의 상전이를 관찰하였다. 그 결과 합성된 합성된 액정단량체는 가열시에는 액정상이 관찰되지 않고 약 52 oC에서 등방성 액체로 녹았으며, 냉각시에는 49.1 oC에서 –9.5 oC 사이에서 전형적이 네마틱 상을 보이고 그 이하에서는 결정성을 나타내는 enatiotropic 상전이를 나타내었다. 합성된 액정 단량체는 광개시제를 포함하는 중합용액으로 제조하여 코팅 후 광조사를 통해 고리화 중합을 진행하였으며, 그 결과 고분자필름을 제조하는 데에는 성공하였으나 중합과정 중 배향이 파괴되어 광학필름으로 사용할 수는 없었다.

The study analyzed the current status of fisheries port market and presented the direction of developments. The fisheries port market has become increasingly widespread due to the aging of the facilities and the scale of the fish product trade, and the number of distribution workers has also increased. The problems of fisheries port market are as follows. First, the transaction structure was changed as the proportion of aquaculture products increased. Second, the trading structure has changed, but it has failed to keep pace with the changes in the production structure. Third, the volume and amount of fish traded in aquaculture products and fish stocks increased. As a result, the growth rate of the fisheries port market is decreasing and profitability is deteriorating. The development direction of the fisheries port market is as follows. First, it is necessary to standardize the fisheries port market facilities, according to the type of fish products. Second, it needs to diversify its trade targets such as processed fish products and imported fish products. Third, it is necessary to diversify the business of the fisheries port market in order to increase profitability.

These days, the interests on the high speed handling robots are increasing because it is important to get down the unit cost of production to get the price competitiveness. The SCARA robot with simple mechanism is more suitable to implement the high speed robot system as well known. The moving parts of SCARA robot have to be designed for high speed. But the structural analysis is induced by the robot links because they drive in high acceleration and deceleration. In this reason, the structural analysis of the high speed SCARA robot is very important in the design process. In this paper, the study on the structural analysis of a high speed SCARA robot has been done and the research results will be introduced.

SUS hexagonal bar, which is manufactured by drawing process of SUS circular bar, have been widely used to make various adapters and fittings. The purpose of this study is to investigate the characteristics and stability of variable roll unit including stand module. Stand module is essential part of variable roll unit. Structural analysis was performed to predict the stability of stand module using 3 loads (50, 75, 100 Ton), thus it may be of help to the manufacture of stand module. As the results, internal ring of bearing showed maximum equivalent stress, and moreover bearing, shaft and roller had to be preferentially considered in order to maintain its stability. In cases of 50 and 75 Ton, there were no problems for stabilities, respectively, on the other hand, problem for stability may occur in case of 100 Ton.

Porous materials such as polymeric foam are widely adopted in engineering and biomedical fields. Porous materials often exhibit complex nonlinear behaviors and are sensitive to material and environmental factors including cell size and shape, amount of porosity, and temperature, which are influenced by the type of base materials, reinforcements, method of fabrication, etc. Hence, the material characteristics of porous materials such as compressive stress-strain behavior and void volume fraction according to aforementioned factors should be precisely identified. In this study, unconfined uniaxial compressive test for two types of closed-cell structure polyurethane foam, namely, 0.16 and 0.32 g/cm3 of densities were carried out. In addition, the void volume fraction of three different domains, namely, center, surface and buckling regions under various compressive strains (10%, 30 %, 50 % and 70 %) were quantitatively observed using Micro 3D Computed Tomography(micro-CT) scanning system. Based on the experimental results, the relationship between compressive strain and void volume fraction with respect to cell size, density and boundary condition were investigated.

Urchin-structured zinc oxide(ZnO) nanorod(NR) gas sensors were successfully demonstrated on a polyimide(PI) substrate, using single wall carbon nanotubes(SWCNTs) as the electrode. The ZnO NRs were grown with ZnO shells arranged at regular intervals to form a network structure with maximized surface area. The high surface area and numerous junctions of the NR network structure was the key to excellent gas sensing performance. Moreover, the SWCNTs formed a junction barrier with the ZnO which further improved sensor characteristics. The fabricated urchin-structured ZnO NR gas sensors exhibited superior performance upon NO2 exposure with a stable response of 110, fast rise and decay times of 38 and 24 sec, respectively. Comparative analyses revealed that the high performance of the sensors was due to a combination of high surface area, numerous active junction points, and the use of the SWCNTs electrode. Furthermore, the urchin-structured ZnO NR gas sensors showed sustainable mechanical stability. Although degradation of the devices progressed during repeated flexibility tests, the sensors were still operational even after 10000 cycles of a bending test with a radius of curvature of 5 mm.

Transition-metal oxide semiconductors have various band gaps. Therefore, many studies have been conducted in various application fields. Among these, methods for the adsorption of organic dyes and utilization of photocatalytic properties have been developed using various metal oxides. In this study, the adsorption and photocatalytic effects of WO3 nanomaterials prepared by hydrothermal synthesis are investigated, with citric acid added in the hydrothermal process as a structure-directing agent. The nanostructures of WO3 are studied using transmission electron microscopy and scanning electron microscopy images. The crystal structure is investigated using X-ray diffraction patterns, and the changes in the dye concentrations adsorbed on WO3 nanorods are measured with a UV-visible absorption spectrophotometer based on Beer-Lambert’s law. The methylene blue (MB) dye solution is subjected to acid or base conditions to monitor the change in the maximum adsorption amount in relation to the pH. The maximum adsorption capacity is observed at pH 3. In addition to the dye adsorption, UV irradiation is carried out to investigate the decomposition of the MB dye as a result of photocatalytic effects. Significant photocatalytic properties are observed and compared with the adsorption effects for dye removal.