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Chaos theory, qualitative study of unstable aperiodic behavior in deterministic nonlinear dynamical systems, is dominant paradigm in the twenty first century. Fractal geometry, as an expressed form of chaos, now influences many areas such as architecture, art, music, economics, literature, etc. The purpose of this study is to analyze fractal geometry and fractal formative elements in architectural design. There are scaling, superimposition, distortion, deformation and repetition in the fractal form generator that can be applied to design concept and process in architecture. This study shows fractal geometry can be the architectural form creation method. Fractal geometry similar to nature"s patterned order can be provided endless possibilities for design analysis and methodology in architecture. Therefore the further study of fractal geometry should progress synthetically through the basis of the study.
Since the past, an attempt of figuration which is for movement, time and force has existed constantly. A process of representative from expressed on the movement, time and force creates events, and the process through the events expresses the idea of a simulacre. Furthermore, Architectural works for potentiality to give a demonstration are in common with hybrid characteristics, and have lasting creation of flux architecture. Ignoring the gravity of the floating figuration, so it appears unrealistic hyperphysical virtual space that easily could make the life of creation. For this reason, the form generation based on the digital design method is expressed the important method. In conclusion, actualizing the virtual is the suitable way for ‘devenir architecture' based upon the Deleuze Guattari's idea of ‘simulacre' and creating the from generation on the contemporary digital architecture design in a similar way.
본 기술보고는 Pin-on-disk 마모시험에서 연속적인 등속도 아르키메데스 나선 경로 계산 방법에 관해 설명한다. 근사 계산된 등속도 아르키메데스 나선은 회전 중심 가까이에서 속도가 불안정하다. 따라서 본 기술보고에서는 등속도 조건을 만족시키기 위해 중공 단면을 가지는 시편을 사용하여 원점 부근에서 오프셋을 주었다. 또한, 내향형 나선과 외향형 나선을 연속적으로 연결하기 위해서 각각의 나선의 시작과 종료 지점 정보를 다음 차례의 나선에 반영하였다. 더불어, 시편의 치수과 마모시험 조건의 변화에 따라 등속도 나선 경로를 편리하게 계산하는 데 도움을 주고자 전용 계산 프로그램을 개발하였다. This technical note describes the calculation method of continuous constant linear velocity Archimedean spiral paths which are applied to the pin-on-disk abrasion test. Approximate constant linear velocity Archimedean spirals have unstable velocities in the very near region of the rotational origin. Thus, in this technical note, the offset distance from the rotational origin was given by using a hollow type rock sample to maintain the constant velocity during the test. Also, to connect the inward and outward spirals continuously, the information of start and end points were input on the next spiral path consecutively. Furthermore, the calculation program was developed to provide convenience for calculating constant linear velocity spirals according to the specimen dimension and abrasion test conditions.
Problems in scalp are common yet challenging complaint among patients with a wide range of dermatologic disorders, including, but not limited to, psoriasis, seborrheic dermatitis and atopic dermatitis etc. Pruritus, papules, scales, hair loss and many other inflammatory signs are common clinical signs and symptoms that occur across many different scalp dermatoses. Scalp tissue is susceptible to inflammatory disorders due to its relatively high follicular density and the abundance of sebum. In addition, the use of hair styling product exacerbates scalp disorders. Topical corticosteroids produce anti-inflammatory and antipruritic effects, and are widely used to treat a variety of inflammatory dermatologic conditions. Topical corticosteroids produce significant rapid improvement in erythema, scaling and pruritus in patients with psoriasis and seborrheic dermatitis, and are effective for the treatment of atopic dermatitis. Topical agents are the mainstay of treatments with clinically proven efficacy for the dermatologic disorders. However, many of them are time-consuming to apply, not easily accessible to the scalp, or potentially irritating when used close to the facial area. Patients are often disappointed with the cosmetic appearance of their hair when topical medications are applied to the scalp, which may include hair discoloration, dryness or unpleasant odors. Medicated shampoos may provide greater convenience than conventional creams or ointments for the treatment of scalp lesions. A clobetasol propionate (CP) shampoo 0.05% was developed several years ago and the once daily application is indicated for treatment of moderate scalp psoriasis. CP shampoo was designed to deliver a super potent corticosteroid in a short-contact formulation in order to minimize the risk of side effects without compromising efficacy. The shampoo vehicle is less messy and less time-consuming to apply than other formulations and is therefore more suitable for treatment of scalp dermatoses. In this session, the efficacy and safety of CP shampoo will be discussed and some clinical trial with CP shampoo in the scalp dermatoses also will be presented.
Environmental control system is adopted to control the thermal load from the avionic equipment in the reconnaissance pod which is mounted under a fighter aircraft, undergoing large and rapid environmental changes with the variations of flight altitude and velocity. In this study, an environmental control system was designed and built by adopting vapor compression cycle using R-124. The cooling performance characteristics of the system were measured varying operating parameters: thermal load in the pod, air mass flow rate through evaporator, condenser inlet air temperature, and air mass flow rate through condenser. The effects of the experimental parameters on the system performance were analyzed based on the experimental results. The problems on the designed system were also analyzed and the solutions were suggested to improve system efficiency and to obtain stable operation.
A drill bit that directly transmits percussive force and torque to the rock is the core part of a rock drilling machine. For the effective drilling, the button arrangement of a drill bit should be optimized because it is the most important design factor determining drilling efficiency. Also, a quantitative method is necessary to evaluate a button arrangement for optimization of a drill bit button. Therefore we proposed a new method for the evaluation of the drill bit button arrangement using the new evaluation indices which include overlapped impact area, blank area and moment. Moreover, we verified the suitability of the proposed evaluation method by applying it to the conventional button arrangement.