• 한국산학기술학회논문지
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• 제11권11호
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• pp.4614-4622
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• 2010

도시 스카이라인은 고층 건축물들에 의해 많은 영향을 받으면서 시간의 흐름에 따라 변화하고 생성되는 특징과 그 도시에 살아가고 있는 인간들의 선택에 의해 형성된다. 따라서 본 연구는 해외의 도시 스카이라인 관리 사례를 중심으로 기준 및 규제, 운영 및 심의, 참여 및 유도 차원에서 조사 분석하였다. 이를 통해 이 연구는 선진 사례의 관리방식에 나타난 공통된 특성으로 합리적이고 계획적인 지구차원의 높이기준 마련, 도시경관 차원에서의 건축물 높이 규제에서 높이 기준으로의 전환, 효율적인 설계심의 및 시민참여 방안 마련, 통합적 관리 관점에서의 행정운영 등이라는 것을 도출하였다. 마지막으로 본 연구는 해외 도시 스카이라인의 관리방식에서 나타난 공통의 가치를 바탕으로, 국내 도시 이미지와 스카이라인 형성을 위한 종합적이고 체계적인 지구차원에서의 높이기준과 관련된 정책적 시사점을 제시하였다.

• 한국소음진동공학회논문집
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• 제27권1호
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• pp.28-35
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• 2017

최근 기존의 유압 차량 리프트는 높이제어의 어려움으로 인해 기술개발의 한계에 직면하였다. 휠 얼라이먼트나 차량의 하중 분포에 따른 미세한 불규칙적인 변형을 보상하기 위해서는 매우 정밀한 위치 제어성이 요구되고 있다. 이 연구에서는 이러한 기존 리프트 시스템의 한계를 해결하고자 매우 정교한 압력강하를 이끌어낼 수 있는 MR 밸브 시스템을 활용하여 새로운 차량 리프트를 제안하고 이에 대한 분석을 진행한다. 우선적으로 MR 밸브의 요구되는 성능을 파악하기 위해 유압 리프트의 운동방정식을 설립하고, 요구되는 압력강하를 얻기 위해 MR 밸브를 설계한다. 또한 정밀한 위치 제어 성능을 얻기 위해 PID 제어기를 설립하고, 시뮬레이션을 통해 제안된 시스템의 제어성을 검증한다.

• International Journal of Precision Engineering and Manufacturing
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• 제9권3호
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• pp.27-32
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• 2008

This paper describes a contact atomic force microscope (AFM) that can be used for high-speed precision measurements of microstructured surfaces. The AFM is composed of an air-bearing X stage, an air-bearing spindle with the axis of rotation in the Z direction, and an AFM probe unit. The traversing distance and maximum speed of the X stage are 300 mm and 400 mm/s, respectively. The spindle has the ability to hold a sample in a vacuum chuck with a maximum diameter of 130 mm and has a maximum rotation speed of 300 rpm. The bandwidth of the AFM probe unit in an open loop control circuit is more than 40 kHz. To achieve precision measurements of microstructured surfaces with slopes, a scanning strategy combining constant height measurements with a slope compensation technique is proposed. In this scanning strategy, the Z direction PZT actuator of the AFM probe unit is employed to compensate for the slope of the sample surface while the microstructures are scanned by the AFM probe at a constant height. The precision of such a scanning strategy is demonstrated by obtaining profile measurements of a microstructure surface at a series of scanning speeds ranging from 0.1 to 20.0 mm/s.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2011년도 춘계학술대회
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• pp.579-582
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• 2011

가변 메카니즘은 키오스크를 이용하는 사용자의 키와 위치를 초음파 센서를 통하여 감지하고, 이를 통하여 적정한 높이와 키오스크의 방향을 조절한다. 본 논문에서는 가변형 키오스크의 높이와 방향 제어를 위하여 ADALINE-퍼지 논리 시스템 제어 방식을 제안한다. 제안한 방식의 유용성을 확인하기 위하여 가변형 키오스크 시스템이 사용자의 방향과 높이에 따른 제어 동작을 제대로 수행하는지 대하여 Widrow-Hoff 델타 규칙과 실험을 통하여 성능을 비교 검토 하였다.

• Tribology and Lubricants
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• 제29권3호
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• pp.180-185
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• 2013

The purpose of this study was to analyze the tribological characteristics of the Electronic control suspension System in a car. In the first example, the cilp used to attach the front electronic control suspension(ECS) system's control actuator was fastened very tightly. Thus, the wire was cut because of continual rotation of the shock-up shover piston rod used to adjust the height of the car. This verified the disconnection phenomenon where wire damaged makes it impossible for the ECS system to send signal to the actuator. The second example, involved a minute hole that allowed gas to leak from the ECS system. As a result, the height of the car verified the down phenomenon. In the third example, the resistance of a wire measured at $0.21{\Omega}$, when the G sensor was disconnected from the system. This verified the system shutdown and lighting of the ECS warning lamp because of body interference caused by a slight pressure on the battery cover. Therefore, quality control is always necessary to ensure safety and durability of a car.

• Journal of Positioning, Navigation, and Timing
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• 제10권3호
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• pp.229-234
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• 2021

In this paper, a study was conducted on the power amplifier control required to design an eLoran transmitter system using a low-height antenna. The eLoran transmitter developed during the eLoran technology development project conducted in Korea used a small 35 m antenna due to the difficulty of securing a site for antenna installation. This antenna height is very low compared to the height of 750 m which is required for eLoran 100 kHz signal transmission without any radiation loss. In the case of using such a small antenna, not only the radiation efficiency of the transmission is lowered, but also the power module control must be performed more precisely in order to transmit the eLoran standard signal. The equivalent RLC circuit of the transmitter system was implemented and transient analysis was conducted to derive the input required voltage for satisfying the output requirement. The voltage waveform was also generated by the RLC circuit analysis to generate the eLoran signal. Furthermore, we suggest power width modulation method to control eLoran power amplifier module more sophisticatedly.

• 대한소아치과학회지
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• 제36권3호
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• pp.433-439
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• 2009

성장 시기가 다른 쥐의 편측 교근에 보툴리눔 A형 독소를 주사하여 하악골 성장에 미치는 영향을 알아보고자 하였다. 각기 다른 주령의 쥐(N=36, 1군: 4주령, 2군: 5주령, 3군: 6주령)를 대상으로 실험을 시행하였으며 각 군은 다시 대조군, 편측주사군, 양측주사군으로 나누어 하악골의 길이를 계측하고 다음과 같은 결과를 얻었다. 1. 1군에서 편측주사군의 주사측과 양측주사군 모두 하악체 길이, 과두 높이가 대조군 보다 낮은 값을 보였다(p<0.05). 2. 2군에서 편측주사군의 주사측과 양측주사군 모두 하악 전방부 높이와 과두높이에서 대조군 보다 낮은 값을 보였다(p<0.05). 3. 3군에서 편측주사군의 주사측과 양측주사군 모두 하악체 길이와 과두 높이, 과두돌기 높이가 대조군 보다 낮은 값을 보였다(p<0.05). 4. 세 군 모두 편측주사군의 양측 비교시 통계적으로 유의한 차이는 없었으나 주사측은 대조측 보다 낮은 계측값을 보이는 경향이 관찰되었다(p>0.05).

• 대한인간공학회지
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• 제34권4호
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• pp.303-312
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• 2015

Objective: The aim of this study is to investigate the effect of insole height change in the lumbosacral angle and physical functions in healthy males. Background: In order to release male's dissatisfaction with his height and to increase satisfaction with his body, using insole is generalized. There have been researches on female's body change in accordance with function of insole and heel height, whereas there are few researches on males. Method: Participants were divided into three groups. A control group had 10 participants who wore 0cm insole. Experimental group I had 10 participants who wore 2cm insole. Experimental group II had 10 participants who wore 4cm insole. All participants wore insoles during their daily lives for a trial period of 8 weeks. The results were evaluated before and after comparison, and we measured lumbosacral angle, balance (dynamic balance, agility, quickness) and lumbar pain (LBP). Results: This study showed that insole height affected lumbosacral angle and dynamic balance and pain. In particular, there were significant differences in the 4cm group among the three groups (p<.05). The 2cm group did show a significant difference in lumbosacral angle and pain (p<.05). Furthermore, no significant difference was observed within the control group. Conclusion: The 4cm insole height suggests that the increase of lumbosacral angle contributes to some changes in LBP, balance, pain and physical functions, probably leading to negative effects on variety of activities of daily life. Application: The results of wearing insoles with proper height will help to prevent musculoskeletal disorders.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2022년도 추계학술대회
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• pp.276-276
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• 2022

Wheat is one of the most widely grown food crops worldwide. Extreme precipitation and wind disturbances increased due to the abnormal climate, which resulted in increased lodging. Introduction of dwarf genes in wheat significantly increased lodging resistance and productivity in wheat breeding. In this study, we performed the genotyping of dwarfing genes between 'Keumkang' and 'Komac 5' ('Keumkang' mutant). In addition, we investigated the relationship between plant height and several phenotypic characters using F₂ segregation populations derived from crosses between the two varieties. There was no significant difference in phenotypic characters between the two varieties except for plant height. In the genotyping analysis using dwarfing genes, mutations of two dwarfing gene were found to be induced between the two varieties. The four genotypes of the F₂ populations from a crossing between 'Keumkang' and 'Komac 5' were used to compare and evaluate the effects of two dwarfing genes. Plants with two single mutant dwarfing gene and double mutant dwarfing gene revealed reduced plant heights than control plants by 4.5%, 6.9%, and 33.2%, respectively. The phenotype analysis showed that double mutant dwarfing gene affected wheat stem growth as the length decreases from the second node, resulting in decreased plant height. However, there were no significant differences in the agronomic traits between mutant plants and control plant. These results may provide novel information about the effect of double mutant dwarfing gene on plant height, and may help improve lodging tolerance and wheat yield.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1999년도 제14차 학술회의논문집
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• pp.198-201
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• 1999

An automated storage and retrieval machinery for high rack warehouse systems is developed in order to stack the various kinds of productions. However, according to increase in the rack height, the long lead time should be taken. In stacker crane systems, the variations of the lifting height and the load generate the vibration of lifting machine, and it makes a Position control to be difficult Therefore, the reduction of vibration will be important factor for saving the lead time and the damage of Productions. This paper deals with a position control of stacker crane in automated high rack warehouse system by using a gain-scheduled control algorithm via a LMI method, where the variations of elastic coefficient of the stacker crane's post are considered.