• 철학연구
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• 제117권
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• pp.113-136
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• 2011

이유의 공지성 논제에 따르면 행위에 대한 이유는 본질상 공적인(즉 모두에게 속하는) 것으로서, 이는 한 사람이 갖는 이유의 규범적 효력이 다른 사람에게도 확장될 수 있음을 의미한다. 월러스는 공적 이유가 갖는 규범적 효력의 양상이 이른바 방해하지 않음의 요구조건에 의해 남김없이 설명될 수 있다고 주장하는데, 이 경우 우리가 적극적 도움과 관련된 이유들을 어떻게 취급해야 하는가라는 문제가 생겨난다. 이러한 우려는 일반적 관계와 특수한 관계성 모두에 해당될 수 있는 것으로서, 월러스는 전자의 경우 도덕원칙에의 호소가 그러한 이유들을 설명해준다고 말한다. 그러나 이러한 주장이 비록 참이더라도, 그 주장이 의존하는 전제, 즉 공지성 논제와 도덕원칙이 정합적으로 연결될 수 있다는 전제는 논쟁의 여지를 갖는다. 이러한 관점에서 논자는 공지성 논제와 도덕원칙 간의 내재적 연관성을 입증하는 고유한 논변을 통해 월러스의 주장의 타당성을 옹호한다. 다음으로 논자는 월러스가 전혀 주의를 기울이지 않는 특수한 관계성의 경우에는 그 관계성 자체를 규정하는 특정한 요구조건들에 의해 적극적 도움의 이유들이 근거 지워질 수 있다는 주장을 편다. 이처럼 일반적 관계와 특수한 관계성에서 성립하는 적극적 도움의 이유들에 대한 고찰을 통해 논자는 행위의 이유와 관련된 우리의 실천적 추론을 이원론적 관점에서 접근하며, 아울러 이러한 이원론이 공지성 논제에 아무런 걸림돌이 되지 않는다는 것을 보인다. 이상의 작업들을 통해 이 논문은 공지성 논제에 대한 월러스의 해석을 강화하는 한편, 그 논제가 윤리학적 논의에서 행하는 이론적 역할을 보다 명료하게 한다.

• 한국소음진동공학회논문집
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• 제23권2호
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• pp.131-143
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• 2013

대부분의 철강산업 기계 등에 설치되어 사용되는 선회베어링은 교체를 위한 정확한 정비계획이 필요하기 때문에 저속회전체의 선회베어링에 대한 진동 상태감시가 매우 중요하게 되었다. 지금까지 음향방출(AE)법이 저속베어링의 상태감시에 가장 많이 사용되는 기술이고 몇몇의 경우는 진동을 사용한다. 음향방출을 사용하는 일반적인 이유는 저속에서 구름요소와 결함위치 사이의 충격에 의하여 발생되는 신호가 약하고 때때로 노이즈나 다른 간섭 주파수에 결함신호가 묻혀 검출이 어렵기 때문이다. 따라서 쉽게 특정 결함에 대한 결함주파수의 동정을 위하여 몇몇 연구자들은 충격에너지를 증가시키기 위하여 인위적으로 미리 정해진 길이, 넓이와 깊이의 결함을 베어링의 내, 외부 레이스에 인가하기도 한다. 이 논문에서는 15 rpm에서 운전하는 저속 선회베어링의 진동신호에 EMD와 EEMD를 적용하였고 논문에서 사용한 진동결함 신호는 국내 산업체에서 공급받은 것이다. 이 논문에서는 베어링결함 주파수 동정을 위하여 EEMD를 사용하여 결함신호의 FFT처리 결과를 입증하고 설명하였다.

• 마이크로전자및패키징학회지
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• 제24권4호
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• pp.19-22
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• 2017

본 논문에서는 방대한 양의 데이터를 전송하기 위한 고분자 광도파로를 기반으로 한 집적 평면형 다중모드 $1{\times}N$ 광 분배소자의 구조를 제안하였다. 두 개의 상이한 모양의 테이퍼 형 광도파로를 이용하여 광의 모드 변환 특성을 분석하고, 넓은 파장 영역에도 동작이 가능한 광분배기 구조를 설계하였다. 일반적인 광 분배기 구조는 Y-branch를 나열하는 형태와 Mach-Zehnder 및 커플러 형태로 제작되고 있으나, 분기부가 반복되면서 광 손실이 증가하는 문제가 있다. 해결 방안으로 본 연구에서 제안되는 구조는 Y-branch를 배열하지 않는 구조를 제안하여 분기부에 대한 손실을 줄이고, 출력단의 광의 세기가 균일하게 출력되는 해결방안을 제안하였다.

• 한국항공우주학회지
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• 제34권11호
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• pp.47-53
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• 2006

본 연구에서는 다중 변조 방식의 변조 지수에 따른 전력 손실을 위성 관제 전송 모드별로 해석하고, 위성 관제 전송 모드에 대한 필요한 위성 링크 마진을 제시하였다. NRZ/PSK/PM 다중 변조 신호의 전송 신호간 간섭 현상과 위성 관제 수신 신호의 임계값을 기준으로 원격 명령과 원격 측정 신호의 최적 부 반송파 신호를 제안하였다. ESA 거리 측정 방식을 사용하는 위성 관제 모드에서는 12 kHz 또는 14 kHz 의 원격 명령 부 반송파 신호를 그리고, GSTDN 방식을 사용하는 운용 모드에서는 16 kHz 부 반송파를 사용하여 다양한 위성 관제를 할 수 있도록 한다. 또한 원격 측정 신호의 부 반송파는 65.536 kHz를 사용하여 양호한 수신 성능 및 동작 영역을 보장하도록 한다.

• 한국농공학회지
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• 제32권4호
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• pp.71-80
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• 1990

Model tests for the ultimate pullout resistance of anchorages and investigation of failure behaviors in cohesionless soil have been conducted. The factors affecting the anchorage are mostly the geometry of the system, and soil properties of sands. The main conclusions of the experimental work were as follows. 1. The load - displacement relationship can be a form of parabolic curve for all plates. 2. The change in ultimate pullout resistance of anchor is mostly affected by embedment ratio and size of anchor, and influenced to a lesser degree by its shape. 3. Critical embedment ratio which is defined as the failure mode changes from shallow to deep mode is increased with increasing height of anchor. 4. For a constant anchor height, as the width of anchor increases the ultimate pullout resistance also increases. However, considering the efficiency of anchor for unit area, width of anchor does not appear to have any sigrnificant contribution on increasing anchor city. 5. Anchor capacity has a linear relation to sand density for any given section and the rate of change increases as the section increases. Critical depth determining the failure patterns of anchor is decreased with a decrease of sand density. 6. With increasing inclination angle, size of anchor, and decreasing embedment ratio, the ultimate pullout resistance of anchor under inclined loading is significantly decreased. 7. The ultimate pullout resistance of double anchor, a method of improving single of anchor capacity, is influenced by the center - to - center spacing adjacent anchors. It is also found that tandem and parallel anchor rigging arrangements decrease the anchor system capacity to less than twice the single anchor capacity due to anchor interference.

• 복식
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• 제25권
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• pp.5-20
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• 1995

The fashion of late Yi dynasty had explored a possibility of new fashional beauty from its own experiences throughout the history of Korean fashion excluding any interference of foreign fashions, and brought out some characteristics ; first, the aesthetical value focused on the more human fashion resulted in the exposure of waist. This aesthetical change in the fashion of late Yi dynasty produced out results as follows ; the length and width of jacket became short and narrow maintaining the basic form, while the width of skirt became increased to be contrasted exceptionally with the upper coat. This mode of fashion reveals the transitional movement from the emphasis on balance to that on unbalance in the late period of Yi dynasty. But regarding the fact that the proportional change by the ways of putting on skirt became to be similar to the golden ratio, we can see many examples throughout the folk paintings by Shin Yun bok, we find that the fashional beauty of that age pursued ideal harmony and unity all the time being in spite of its tendency toward non-refinement. Second, we see another peculiarity in the mode of woman's fashion from the paintings by Shin Yun-bok who always depicted the hu-man nature frankly. For example, the jacket became shorter to emphasize lady's slim waist, and underwears began to be exposed after the upper part of skirt had been to expose lady's waist while the bottom line pulled up highter than before. Thus, as the function of robe had changed from a mere means of covering into an expression of beauty, the fashion of late Yi dynasty began to express a perfectly new beauty possessing an erotic mood and sensu-ality of a woman, which was its inner aesthetic need. Third, this emergence of new fashional beauty made the mental value of man and the aesthetic views of that time quite different from the previous ones, and finally there came various expressions of a new beauty. There-fore, the woman's fashion of late Yi dynasty is noted for the exposure and emphasis on the body line of a woman after the aesthetic view-point had changed of time toward pragmatism and humanism, while upholding the traditions of Korean clothes and pride for the nation. And our ancestors realized very Korean fashional beauty by pursuing the expressional ways of gentle, indirect emphasis upon the feminine and natural beauty to exclude and ar-tificial, direct and straightforward exposures and images.

• Smart Structures and Systems
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• 제20권2호
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• pp.231-246
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• 2017

A recent work by the authors has demonstrated the feasibility of scour evaluation for Kao-Ping-Hsi Cable-Stayed Bridge simply based on ambient vibration measurements. To further attain the goal of scour monitoring, a key challenge comes from the interference of several environmental factors that may also significantly alter the pier frequencies without the change of scour depth. Consequently, this study attempts to investigate the variation in certain modal frequencies of this bridge induced by several environmental factors. Four sets of pier vibration measurements were taken either during the season of plum rains, under regular summer days without rain, or in a period of typhoon. These signals are analyzed with the stochastic subspace identification and empirical mode decomposition techniques. The variations of the identified modal frequencies are then compared with those of the corresponding traffic load, air temperature, and water level. Comparison of the analyzed results elucidates that both the traffic load and the environmental temperature are negatively correlated with the bridge frequencies. However, the traffic load is clearly a more dominant factor to alternate the identified bridge deck frequency than the environmental temperature. The pier modes are also influenced by the passing traffic on the bridge deck, even though with a weaker correlation. In addition, the variation of air temperature follows a similar tendency as that of the passing traffic, but its effect on changing the bridge frequencies is obviously not as significant. As for the effect from the alternation of water level, it is observed that the frequency baselines of the pier modes may positively correlate with the water level during the seasons of plum rains and typhoon.

• 대한기계학회논문집B
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• 제26권1호
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• pp.27-38
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• 2002

The effects of Reynolds number on the non-nulling calibrations of a cone-type ave-type probe in low-speed flows have been investigated at Reynolds numbers of 2.04$\times$10$^3$, 4.09$\times$10$^3$and 6.13$\times$10$^3$. The calibration is conducted at the pitch and yaw angles in ranges between -35 degrees and 35 degrees with an angle interval of 5 degrees. In addition to the calibration coefficients, reduced pitch and yaw angles, static and total pressures, and velocity magnitude are obtained through a typical non-nulling reduction procedure. The result shows that each calibration coefficient, in general, is a function of both the pitch and yaw angles, so that the pre-existing calibration data in a nulling mode are not enough in accounting far the full non-nulling calibration characteristics. Due to interference of the probe stem, the calibration coefficient are more sensitive to Reynolds number at positive pitch angles than at negative ones. The calibration data reduced in this study may serve as a guide line in the estimation of uncertainty intervals resulted from the Reynolds number effects at low Reynolds numbers.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제2B권3호
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• pp.115-124
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• 2002

This paper presents an active auxiliary edge-resonant DC link snubber with a ringing surge damper and a three-phase voltage source type zero voltage soft-switching inverter with the resonat snubber treated here for the AC servo motor driver applications. The operation of the active auxiliary edge-resonant DC link snubber circuit with PWM voltage is described, together with the practical design method to select its circuit parameters. The three-phase voltage source type soft-switching inverter with a single edge-resonant DC link snubber treated here is evaluated and discussed for the small-scale permanent magnet (PM) type-AC servo motor driver from an experimental point of view. In addition to these, the AC motor stator current and its motor speed response for the proposed three-phase soft-switching inverter employing Intelligent Power Module(IPM) based on IGBTS are compared with those of the conventional three-phase hard-switching inverter using IPM. The practical effectiveness of the three-phase soft-switching inverter-fed permanent magnet type AC motor speed tracking servo driver is proven on the basis of the common mode current in a novel type three-phase soft-switching inverter-fed AC motor side and the conductive noise on the mains terminal interface voltage as compared with those of the conventional three-phase hard-switching inverter-fed permanent magnet type AC servo motor driver for the speed tracking applications.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제8권8호
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• pp.2590-2606
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• 2014

A problem related to deployment of femtocells is how to manage access of users to radio resources. On one hand, all resources of the femtocell can be reserved for users belonging to a closed subscriber group (CSG), which is a set of users defined by a femtocell subscriber. This approach, known as closed access, however, increases interference to users not included in the CSG as those users do not have a permission to access this femtocell. Contrary, resources can be shared by all users with no priority in an open access mode. In this case, the femtocell subscriber shares radio as well as backhaul resources with all other users. Thus, throughput and quality of service of the subscriber and the CSG users can be deteriorated. To satisfy both the CSG as well as non-CSG users, a hybrid access is seen as a compromise. In this paper, we propose a new approach for sharing radio resources among all users. As in common cases, the CSG users have a priority for usage of a part of resources while rest of the resources is shared by all users proportionally to their requirements. As the simulation results show, the proposed resource sharing scheme significantly improves throughput of the CSG users and their satisfaction with granted bitrates. At the same time, throughput and satisfaction of the non-CSG users is still guaranteed roughly at the same level as if conventional sharing schemes are applied.