• International Journal of Precision Engineering and Manufacturing
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• 제8권2호
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• pp.70-74
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• 2007

This paper describes the development of a nano-positioning system for nanoscale science and engineering. Conventional positioning systems, which can be expensive and complicated, require the use of laser interferometers or capacitive transducers to measure nanoscale displacements of the stage. In this study, a new self-displacement sensing (SDS) nano-stage was developed using mechanical magnification of its displacement signal. The SDS nano-stage measured the displacement of its movement using a position-sensitive photodiode (PSPD), a laser source, and a hinge-connected rotating mirror plate. A beam from a laser diode was focused onto the middle of the plate with the rotating mirror. The position variation of the reflected beam from the mirror rotation was then monitored by the PSPD. Finally, the PSPD measured the amplified displacement as opposed to the actual movement of the stage via an optical lever mechanism, providing the ability to more precisely control the nanoscale stage. The displacement amplification process was modeled by structural analysis. The simulation results of the amplification ratio showed that the distance variation between the PSPD and the mirror plate as well as the length L of the mirror plate could be used as the basic design parameters for a SDS nano-stage. The PSPD was originally designed for a total travel range of 30 to 60 mm, and the SDS nano-stage amplified that range by a factor of 15 to 25. Based on these results, a SDS nano-stage was fabricated using principle of displacement amplification.

• 디자인학연구
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• 제18권4호
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• pp.147-154
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• 2005

다양한 미디어 환경으로 인한 이미지의 재매개화 과정은 디미털 미디어문화 세대에게 또 한번의 거울단계를 거치게 하고 있다고 보고, 라캉의 거울단계이론과의 연관성을 고찰하는데 연구의 목적이 있다. 전통적인 매체가 인터넷으로의 재매개, 컴퓨터그래픽으로 인한 초실재적 환상의 재현으로 조성되는 가상세계와 실재세계와의 혼돈, 가상적 이민지가 선망의 대상으로 부각되며 실제적 이미지를 변화시키는 동일시 현상 등은 다양해지는 영상미디어의 상호 연계로 인한 재매개 기능으로 유발되는 것이다. 주체와 이상화된 자아만의 관계인 2자적 관계에서 발생하는 타인이 배제된 '나르시스적' 동일성은 새로운 자기표현을 찾는데 능숙한 마니아 문화를 형성한다. 능동적인 마니아문화의 '자기반영 성'(Reflexivity)은 현대 미디어 문화의 특징이 될 수 있는 것이다. 그러나 디지털 미디어문화 세대가 자기 반영에 사로잡혀 타인이 배제된 나르시스즘에서 벗어나지 못한 채 이미지 은하계에서 소모적인 재미에 빠져 길을 잃는다면, 이러한 세대는 새로운 인간형으로 성장하지 못할 수도 있다. 이에 따라 거울단계와 연관된 '영상 리터러씨'(Visual Literacy)교육에 대한 체계적 연구를 필요케 한다.

• 한국정밀공학회지
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• 제25권8호
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• pp.21-28
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• 2008

Fizeau interferometer is used for inspecting the lens surface profile accurately. This study is focused on the design and optical measuring techniques for large optical components, such as a reflection mirror for large area lithography or astronomical purpose. A tower type Fizeau interferometer is designed and set up in horizontally with a 45$^{\circ}$ fold mirror which makes easy to align the optical path of heavy interferometer system. To align the optical path, a five-axes stage for the interferometer is required. This study shows a method of the 45$^{\circ}$ fold mirror alignment by using a three-axis stage instead of adjusting the interferometer itself or measuring object. This system will be installed on the large optics polishing machine during the manufacturing process as an on-machine inspection system.

• 대한한의학방제학회지
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• 제24권1호
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• pp.17-30
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• 2016

Objectives Rehmanniae Radix Preparata was prepared in the traditional Rehmanniae Radix Preparata preparation method set forth in the 『Treasured Mirror of Eastern Medicine(Donguibogam)』 with a view to measuring the contents of 5-Hydroxymethyl-2-furaldehyde(5-HMF) at individual stages of steaming and sundrying and identifying new chemical components.Methods Based on the traditional Rehmanniae Radix Preparata preparation method set forth in the 『Treasured Mirror of Eastern Medicine』, Rehmanniae Radix Preparata steamed and sundried once through nine times was prepared. Thereafter, 5-HMF contents were analyzed and new chemical components were identified in the Rehmanniae Radix Preparata using Waters HPLC e2695, 2640 detectors, a Waters Acquity UPLC system, and a Micromass Q-TOF Premier mass spectrometer.Results The Rehmanniae Radix Preparata preparation method set forth in the 『Treasured Mirror of Eastern Medicine』 is a unique preparation method in Republic of Korea different from that in China. In the first stage of the method, fresh Rehmanniae Radix Crudus was divided into high quality, medium quality, and low quality ones named Rehmanniae Radix Crudus (Caelum)(天黃), Rehmanniae Radix Crudus (Homo)(人黃), and Rehmanniae Radix Crudus (Terra)(地黃) respectively to use Rehmanniae Radix Crudus (Caelum) and Rehmanniae Radix Crudus (Homo) for preparation of juice while using Rehmanniae Radix Crudus (Terra) to make Rehmanniae Radix Preparata. In the second stage, Rehmanniae Radix Crudus (Caelum) and Rehmanniae Radix Crudus (Terra) were made into juice and Rehmanniae Radix Crudus (Terra) was soaked in the juice. In the third stage, among auxiliary materials, rice wine named Purum Vinum Oryzae(淸酒) brewed from sticky rice was sprinkled on Rehmanniae Radix Crudus (Terra) to the extent that Rehmanniae Radix Crudus (Terra) became wet. In the fourth stage, Rehmanniae Radix Preparata steamed in earthenware steamer was dried under natural sunlight. The contents of 5-HMF in Rehmanniae Radix Preparata steamed and sundried once through nine times were shown to be below 0.1% in all cases. Pomolic acid was identified as a new chemical component.Conclusions In conclusion, the Rehmanniae Radix Preparata preparation method set forth in the 『Treasured Mirror of Eastern Medicine』 is thought to be a unique preparation method in South Korea in which Rehmanniae Radix Preparata is completed through the first stage in which fresh Rehmanniae Radix Crudus collected from fields is divided into high, medium, and low quality ones and fresh Rehmanniae Radix Crudus juice is made, the second stage in which the high quality fresh Rehmanniae Radix Crudus is soaked in the fresh Rehmanniae Radix Crudus juice, the third stage in which the fresh Rehmanniae Radix Crudus is steamed, and the fourth stage in which the steamed Rehmanniae Radix Crudus is dried.

• International Journal of Internet, Broadcasting and Communication
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• 제16권1호
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• pp.92-98
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• 2024

This meta-analysis systematically reviewed studies on mirror therapy focused on arm and hand function in stroke patients, aiming to comprehensively assess the efficacy of mirror therapy interventions and furnish empirical support for its potential application and future development in the context of stroke rehabilitation. A rigorous search for articles published in international journals up to the year 2022 was conducted. Various assessment tools were employed to calculate effect sizes, evaluating the impact of mirror therapy on arm and hand function in stroke patients. Utilizing a random-effects model, mean effect sizes were determined, yielding a total effect size of 0.545. The effect sizes for the Brunnstrom Recovery Stage (BRS), Box and Block Test (BBT), Modified Barthel Index (MBI), Fugl-Meyer Assessment (FMA), and grip strength test were 0.957, 0.596, 0.490, 0.488, and 0.417, respectively. In summary, we suggest that mirror therapy engenders positive changes in functional recovery among stroke patients, establishing a foundation for its tailored clinical application based on individual subject characteristics.

• 대한기계학회논문집A
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• 제24권11호
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• pp.2732-2741
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• 2000

Combination of magnetic recording technology and optical recording technology such as Near Field Optical Recording is watched recently. In order to accomplish this technology, the development of an electromagnetic driven mm-sized mirror shifting laser beam in track direction have to needed. In Near Field Optical Recording System, shifting laser beam in track direction mean as fine tracking and means as coarse tracking. Therefore in Near Field Optical Recording, 2-stage actuator is composed of servo controller in reading or recording information on disc layer. In our research, through design and simulation process of driven mm-sized mirror, we arrange systematically design process of driven mm-sized mirror having good frequency transfer characteristics. Design and simulation processes included modal analysis of spring, calculation of magnetic moment according to the number of turns and geometric configuration of coil and magnetic circuit analysis meaning that calculation of magnetic flux density in air gap of magnetic circuit. After that we design and make parts of driven mm-sized mirror, assemble and evaluate our electriomagnetic driven mm-sized mirror. we compared design values with actual characteristic values and present solution scheme. Through these processes we performed manufacturing of an electromagnetic driven mm-sized mirror having good frequency-domain characteristics and high sensitivity characteristics.

• 헤리티지:역사와 과학
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• 제39권
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• pp.281-314
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• 2006

Several explanations exist about the usage of disk-shaped bronze implements in the ancient society. Some argue that they were used as mirrors, others suggest percussion instruments, and still others bronze ornaments. Differences between disk-shaped bronze implements and mirrors with multiple knobs are that the former have no visible design, only one handle, and a sharp curvature unlike the latter with smooth curvature. The question is whether disk-shaped bronze implements excavated from Korean peninsula have any light reflecting function. To answer this question, I carefully studied the concave surfaces of disk-shaped bronze implements excavated from Goejeong-dong, Tongso-ri and Hapsong-ri sites. The main findings are as follows: (1) The concave sides of the disk-shaped bronze implements excavated from Goejeong-dong and Tongso-ri sites were highly polished, and they were as reflective as bronze mirrors. (2) The concave side of the disk-shaped bronze implement from Hapsong-ri site was unpolished, and it was different from bronze mirrors. (3) As for the convex sides of the disk-shaped bronze implements, they did not appear to have been polished with care. Considering the above findings, the disk-shaped bronze implements excavated from Goejeong-dong and Tongso-ri sites belong to the stage where they could act as both mirrors and instruments. On the contrary, the disk-shaped bronze implement from Hapsong-ri site can belong to the stage where it lost the function of being a mirror as the result of maintaining only its function as an instrument. Even though disk-shaped implements had two functions, it can be considered that the light reflecting function expanded the role of a mirror with multiple knobs and the sound function helped the engraved round bronze implement to be converted into an eight-armed bronze rattle. Since it has been reported that shamans used bronze mirrors as percussion instruments in their performances in Korean peninsula and Siberia, I propose a reconsideration of the usage of mirrors in the ancient East Asia. Although the essential function of a mirror is to reflect light, other possible usages involving important functions need to be further investigated.

• 대한전자공학회논문지SD
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• 제39권4호
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• pp.93-103
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• 2002

고정도 전류-모드 신호 처리와 집적 회로 설계를 위한 새로운 전류 미러를 제안하였다. 제안한 전류 미러는 입력 임피던스를 줄이기 위해 적응성 귀환 기법을 사용하였고, 출력 임피던스를 높이기 위해 조절된 캐스코드 전류 미러의 출력단을 이용하였다. 시뮬레이션 결과 제안한 전류 미러는 Vcc=5V의 공급기 전압에서 0.9Ω의 입력 임피던스, 415 MΩ의 출력 임피던스, 그리고 0.96의 전류 이득을 가진다. 소비 전력은 1.5㎽이다. 제안한 전류 미러의 응용성을 확인하기 위해 이를 이용한 전압-전류 변환기를 설계하였다. 시뮬레이션 결과, 이 변환기는 이론식과 일치된 결과를 얻었고 월슨 전류 미러를 이용한 전압 전류 변환기보다 3배 이상의 우수한 변환 특성을 가졌다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2015년도 추계학술대회
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• pp.451-454
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• 2015

본 논문에서는 저전압, 저전력 회로에 적합하고, $0.35{\mu}m$ 공정을 이용한 3가지의 OTA를 제시한다. 첫 번째는 1V의 공급전압과 $1.774{\mu}W$의 소비전력을 사용하며 모든 트랜지스터들이 strong inversion 영역에서 동작한다. Bulk 입력으로 인해 줄어든 gm을 보상하기 위해서 Gm-enhancement 기법을 사용하였고, 저전압으로 동작하는 Wide swing current mirror, Class-A output을 적용하였다. 두 번째는 0.8V의 공급전압과 52nW의 소비전력을 사용하여 112dB의 높은 이득을 가지는 2-stage OTA이다. Current mirror는 두 개의 MOS의 Gate를 묶는 Composite Transistor 구조를 사용하여 마치 Cascode와 같은 효과를 주어 출력저항을 높여주었다. 세 번째는 0.6V의 공급전압과 160nW의 소비전력을 사용하여 77dB의 이득을 가지는 2-stage OTA이다. 두 번째 증폭 단에 추가적인 바이어스전압이 필요하지 않으면서 증폭할 수 있도록 Common Gate 구조로 구현하여 Level Shift 기능을 사용하였다.

• 복식문화연구
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• 제25권3호
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• pp.375-390
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• 2017

The aims of this research were to characterize magic realism by analyzing existing magical reality literature reviews and research and to identify material that may inspire ideas for stage and film costume design by analyzing and drawing design characteristics and magic realism of costumes from Director Tarsem Singh's movie, 'Mirror, Mirror'. For the methodology, characteristics of magic realism in literature and, movies were analyzed, with a theoretical consideration of these materials on magical realism. Data on costume design and magical realism characteristics for use in the analysis were collected from the main characters of 'Mirror, Mirror' as well as from other characters. The result of this analysis was the emergence of five common characteristics of the magic realism Historicity, the most remarkable characteristic seen in Tarsem Singh films, was expressed through the symbolic meaning and decorative patterns shown by the traditional-style costumes, colors. Symbolization was expressed through the symbolic meaning, decorative elements, and traditional clothes, as shown by the colors and forms of the costumes. Fantasy was expressed through the colors, decorative elements, forms of traditional clothing, and forms with symbolic meaning. Reproducibility was expressed through the method of decorative element, symbolic meaning, traditional forms and de-structural clothes. Ambiguity, which can be associated with the combined characteristics of historicity and fantasy, was expressed in the clothes worn in the scenes that confounded time and space within the film.