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The study is motivated by methodological approach on how to apply the existing traditional placeness to the present age. Moreover, its purpose lies in establishment of character of place that not only embraces the existing meaning of place but also reflects on the new paradigm of space through culturenomics which embraces the core indexes of modern values such as economics, culture, and everything. Culture has a potential to create various values through its convergence with other fields, one of which is place. Place is essentially an original center of human existence. Culture is no more separated from daily life and people"s way of life becomes a culture. In the a culture-oriented social system, design of place will be developed in a multi-dimensional way that accepts diversity and centers on relation. At our places experiencing placelessness through uniformity and modernization. this study has a significant meaning since it shows culturenomics may offer a solution to the direction of growth in the future.
본 논문은 대용량 유도전동기가 기동할 때 발생하는 큰 돌입전류로 인해 PCC(Point of Common Coupling)에 심한 전압 강하가 발생하게 되어 기동에 실패하는 문제를 해결하기 위해 대상 유도전동기의 기동 특성과 배전계통을 모델링하고 시뮬레이션을 수행함으로써 유도기 기동시에 전압저하 현상을 해석하였다. 문제가 되는 유도전통기는 2500KVA용량의 펌프용 농형 유도전동기로 리액터 기동법을 채용하고 있다. 2500KVA 유도전동기 한대의 기동에는 문제가 없으나 기동 완료 후 PCC 전압이 다소 떨어진다. 하지만 추가로 동일 용량의 유도전동기가 기동하게 되면 PCC의 심한 전압강하로 기동에 실패하게 되는 문제가 발생하였다. 이러한 문제 해결을 위해 본 논문에서는 실제 기기의 기동시 토크-속도 곡선을 이용한 유도전동기의 기동 특성을 정확히 모델링하고 시뮬레이션을 수행하여 두 대의 대용량 유도전동기가 순차적으로 기동에 성공할 수 있는 적절한 전압보상 방안을 제안하였다. 본 논문에서 논의되는 대용량 유도전동기는 한국수자원공사의 취수장에서 운전되고 있으며 대상 유도전동기 및 배전계통은 PSCAD/EMTDC 소프트웨어를 사용하여 모델링 및 시뮬레이션을 수행하였다. This paper is intended to solve the technical problem that fails in large-capacity induction motor starting due to serious voltage drop during starting period. One induction motor that is established already can reach in steady-state using reactor starting method but the voltage magnitude of PCC (point of common coupling) has dropped down a little. When the same capacity induction motor is installed additionally in the PCC, where the existing induction motor is operating, voltage drop becomes more serious by starting of additional induction motor. As a result, the additional induction motor fails in starting. Therefore, voltage compensation method is proposed so that all of two induction motors can be started completely. First, modeling technique is described in order to implement starting characteristics of large induction motor. And then, this paper proposes strategic starting scheme by proper voltage compensation that use no-load transformer tap control (NLTC) and step voltage regulator (SVR) for starting of two large induction motors successfully and improving the feeding network voltage profile during the starting period. The induction motor discussed in this paper is the pumped induction motor of 2500kVA capacity that is operating by KOWACO (Korea Water Resources Corporation). Modeling and simulation is conducted using PSCAD/EMTDC software.
Contemporary architecture has a tendency to concretely approach based on the concept of Deuleuze"s "fold" diversity problems creating continuously potential diversities within Post-structural paradigm. Contemporary architecture relates to human life through its relation with human being. The research investigates through case study the possible relation of the concept of Deulezue"s "fold", one of his concepts of "unfolding" based on Monadology, with logic of creation that constructs a space in contemporary architectural space. Eight contemporary architectural spaces since 1990 with architectural embodiment of Deulezue"s "fold" concept have been selected as cases. Based on the fact that the potential possibility of a space can be embodied by the thinking of "fold", the research draws four physical activities such as "properties connection", "beyond border", "diversity of circulation" and "potential opportunity", through which it studies on the principle of actualization of space creation. Consideration of metaphysical theory as a pre-modern and outdated one may lose a huge potentiality. Leibniz"s metaphysics can be rediscovered as a model that provides diverse potentiality. The concept of "fold" in Monadology needs be reconsidered because it possibly suggests a methodology that embodies through the actualization of space the meanings underlain in contemporary architectural space.
Typical power windows of automobile are composed of wire and motor regulator. This type of wire was occasionally broken at the field. So It's tension of wire study was measured at all circumstances (normal temperature and cold temperature). The tension and drive current were increased sharply at the initial working, especially at low temperature. This study will improve the design of window regulator and durability performance.
Generally, leakage in high pressure hose assembly can be determined by that hydraulic fluid falls down through fitting which is swaged with rubber hose. The leakage which is the failure phenomenon occurred often in hydraulic system was tried to prevent. In the case of methods which verify leakage paths in power steering hydraulic system equipped with high pressure hose assembly, three types of leakage paths which can be seen by cutting the swaging part can be generally experienced. However, it was difficult to find out leakage paths using power steering oil. In this study, four methods which are thermal burn image method, hole drilling method of fitting metal, white paint infiltration method, and fluorescent infiltration method were tried to introduce. Fluorescent infiltration method could verify leakage path with the unaided eye simply to hold the cutting swaging part closely to the ray of light. Reappearance test methods in high pressure hose assembly, which are hole drilling, white paint infiltration, and fluorescent infiltration method, can be applied to find failure mode and to approval test before mass production of high pressure hose.
The tire uneven wear has been an ongoing concern for a long time, and one of customer's complaints too. This paper deals with uneven wear improvement of passenger car tires, to have tested the tire wear levels by each wheel alignment set (according to changing toe and camber) using taxis. The pre-set wheel alignments on test vehicle were gained by energy friction simulation of tire. The result of this experiment was as follows : First, verified the effects of initial wheel alignment (adjusted at Curb Vehicle Weight) to minimize tire uneven wear. Second, tire uneven wear makes tire life much shorter than even wear does.
Failure mechanism of the poor contact is analyzed on the basis of used connectors and this poor contact of connectors is reappeared by the new forced fretting wear method. As the result of failure analysis and reappearance, fretting wear and corrosion of the contact interface causes the contact resistance degradation and the poor contact of connectors. The amount of degradation depends on the fretting stroke. Changes in contact resistance of static contacts are likely to be small and gradual, while motions of contact interface may result in larger and discontinuous changes in resistance and voltage. This voltage drop by fretting motions is large enough to cause the distortion of sensor signal and mis-working of electric components.
The failure mode of steel road wheels in a vehicle is cracks from ventilation hole through to contact plane on steel wheel's disc plate. But a number of cracks of Cornering Fatigue Limit Test is on contact plane near to wheel nut mounting area, even though it's satisfied with specified cycles. So this paper searches out causes to improve durability and reliability of C.F.T by uni-axial bending moment test. The verified cause is a “fretting” on contact area of steel wheel. In result, this paper suggests a solution to prevent a fretting by inserting a damping shim, 0.7㎜ between steel wheel contact areas. Therefore this paper makes it possible to move crack position of C.F.T in steel wheel from contact plane to vehicle's failure mode.