• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2002.05a
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• pp.298-302
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• 2002

Equivalent volume estimation of the coupler and two coupled microphones has a key role in standard microphone pressure calibration. The equivalent volume of the microphone is determined by the dynamic characteristics of the diaphragm system and front cavity. Therefore the modal parameters of diaphragm system - natural frequency and damping fatter - should be measured explicitly for the estimation of the equivalent volume. The diaphragm system is composed of the vibrating diaphragm, back slit behind diaphragm, pressure equalization vent, and front cavity which are acoustically coupled. In the measurement, the electrostatic actuator was used to excite the system with the swept sine, and the frequency response was obtained. The close actuator in front of the diaphragm must influence the radiation impedance of the system, and then the modal parameters. From the measured frequency response, the natural frequency and the damping factor could be estimated with the Complex exponential method based on the Prony model and the zero crossing real and imaginary plot.

• Korean Journal of Optics and Photonics
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• v.3 no.1
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• pp.16-19
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• 1992

The Fourier transform spectra of a grating have been employed to determine the refractive index of a simple lens. The shearing interferometric technique is used for collimation testing of the expanded laser beam and for determining the exact focal plane. The slit attached to micro X-Y translator has been used to measure the distance between two sucessive diffraction orders in the back focal plane of the test lens. The experimental equipment is described and results are presented.

• Fashion & Textile Research Journal
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• v.19 no.4
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• pp.385-399
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• 2017

This study will broaden the application of doll costume product with historical characteristics and the image of unlined cheollik in the $17^{th}$ century period of transition during the Joseon Dynasty. Historical design sources were extracted from old documents and precedent studies. Unlined cheollik of Shin Gyeong-yu, meritorious retainer, were selected as main reference-relic because of various fabric, preserved conditions and definite shape. 'Baby doll' was selected as main model because of consumer preferences and awareness. Design sources from unlined cheollik in the early $17^{th}$ century were about a 1:2 ratio of upper and under parts, removable separated doori-somae, knife-shaped collar (outside), projected square collar (inside), long pleats line, side slit, traditional flat fell seam sewing. Trapezoidal side line, round waistline, and thin fabric were applied in designs because of toddler-body of doll model. Three designs were produced in step 1: Cheollik A focusing on the historical remake (traditional type), Cheollik B with belt and side slit (crossover type), and Cheollik C with back- opening (modern type). In step 2, interview with fashion major student was conducted to increase the utility of designs. As a result, modern trend sources (frill, velcro, round armhole line, slope of sleeves, and floral pattern) were reflected in Cheollik B, C. Finally, three doll cheollik and cheollik-styled doll apron sample were produced. Various versions must be suggested in the study of doll costume products with traditional sources that balance historical characteristics and practicality to improve customer satisfaction.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.24 no.1
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• pp.36-46
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• 2013

This paper proposes the design of broadband spiral antenna for a potable non-linear junction detector (NLJD) system. To realize the broadband antenna design, it was considered optimization of the number of spiral turns by iteration calculation. Ground plane with the Archimedean spiral slit to keep the same current distribution between radiating plane and ground is considered for circular polarization design. In order to realize high directivity and high gain of the proposed antenna, the cavity wall and the metal cap which is located on back of ground plane were also considered in design. Measurement results of return loss were agreed well with VSWR 2:1 at interested frequency band among 2.4 to 2.44 GHz, 4.84 to 4.92 GHz and 7.28 to 7.36 GHz. Measured axial ratio was observed 3 dB below and showed reasonable agreement with simulation results. Characteristics of the RHCP(Right Hand Circular Polarization) with the measured gain of 6.8 dBi above at interested frequency band were also observed.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.18 no.1
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• pp.159-165
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• 2018

In this paper, a low-loss wideband waveguide transducer is proposed for millimeter-wave communication and radar applications. A conventional E-plane probe transducer is generally designed using thin and flexible substrate at millimeter-wave frequencies, considering the very small waveguide size. However, it results in serious performance degradation caused by the bending of the substrate. In order to alleviate this problem and provide a reliable performance, we propose an extended E-plane probe transducer where the probe substrate is extended to and fix ed in the slit area formed in the waveguide wall. It is fabricated using $127{\mu}m$-thick substrate with dielectric constant of 2.2. The measurement in the back-to-hack configuration shows the excellent insertion loss of 1.35 dB (${\pm}0.35dB$) including the loss of 3 cm-long thru waveguide and return loss better than 13.8 dB over entire W-band (75-110 GHz). Therefore, it can be effectively applied for millimeter-wave high-speed communications and high-sensitivity radars.

• The Research Journal of the Costume Culture
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• v.17 no.5
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• pp.886-896
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• 2009

Acjurumpo is one of the most representatives daily outfit of Joseon Dynasty is a clothes which has a characteristic of having creases under the armhole and it has a lot of chance to use on modern clothes design. This study wants to provide a information on traditional clothes to the public and modernize traditional clothes by designing modern women clothes by adapting Acjurumpo, one of Joseon Dynasty's men' daily outfit which is not very well-known to publics as a link of traditional clothes modernization. Acjurumpo's characteristic is usually having a knife-shape collar and having two sup and one sup, but outside sup of having two sup was more common. There were tongsu, duri, as a example of shape of sleeve. For Mu the combinations were different from Acjurum starting with a shape of trapezoid, triangle to big Mu on a body of side line. For Gorum there were two pairs of long and short Gorum, two pairs of short Gorum or one pair of short or long Gorum. Slit of po was on both side or back. Acjurumpo which was adapted on modern clothes, it was usually used on Hanbok companies that used traditional shape or similar shape to design children' clothes. This study designed three summer one-piece and two winter jacket for women clothes adapting Acjurumpo. And it was designed by using modern material adapting Acjurumpo's characteristics, changing knife-shape collar, Acjurum, mu and Gorum. This study expects for popularization of many traditional clothes developed by modern design in future.

• Journal of the Korean Society of Costume
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• v.56 no.7 s.107
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• pp.68-84
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• 2006

The aim of this study is to examine a structure of trousers worn by males in the western world during the 17th and 18th centuries in order to understand the characteristics of evolution in construction. it mainly examined engravings from these era because they provided me fine and detailed portrayals of what it needed to observe. Then, it classified them into models according to each era. it supplemented a flaw of depending on single type of studying material by examining other types of historical materials such as historical paintings and documents for comparative analysis of materials and decorations and previous studies on preserved historical documents to observe the examples of structures of trousers. Secondly, it studied both historical documents and previous studies on the trousers patterns used back in those days, analyzed the characteristics of each designing method by actually draping these patterns, and observed the differences in these completed patterns to understand the characteristics of changes in fashion design skill. As for the changes in length, these patterns show only a slight difference around above and below the knee line. However, the widths of waist, hip, girth and hem were significantly altered over the years to reduce wrinkles and the cutting lines became more refined to make the clothes fit to the body. As a result, a simple but fine patterning technique was born. In particular, new methods in cutting and sewing were invented for detailed parts such as waist, pocket, front and slit.

• The Research Journal of the Costume Culture
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• v.19 no.5
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• pp.903-916
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• 2011

The purpose of this study was to analyze the eroticism of the exposed body and clothing style of Chinese foreign students in Korea and to provide basic information required to design and develop a niche market for the Chinese. A Chinese professor translated 52 questions, which formed a preliminary survey given to 30 Chinese students. Following this preliminary survey, some questions were then revised. The surveys were conducted during 3 weeks starting from the 5th of October. Only 289 of 330 questionnaires were selected for statistical analysis. Data were analyzed statistically through Frequency analysis, Chi-square test, T-test, and Regression analyses in SPSS 12.0. The results of this study were as follows. First, we should consider men's breast, back, and neck line in order to develop the design of men's clothes, and the leg and collarbones for women's clothing. Second, it was suggested that we pay attention to the following articles of clothing to expand the erotic market for Chinese women's clothes: mini-skirts, side slit skirts, and tight-skirts for bottoms; blouses or T-shirts with a neckline scooped out deeply for tops; and see-through one-piece dresses with deeply scooped out backs.

• Journal of the Korean Society of Costume
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• v.61 no.7
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• pp.67-79
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• 2011

This study is to design a ball-jointed doll costume with historical research in clay female doll's costume from Hwangsung-dong tomb of the Silla Dynasty[新羅] in 7C. This clay female doll's costume was characterized by slim silhouette, long sleeves, no neckline, side slit, high waistline, and bun on the back neck of representative of the early era. According to literature of 7-8C and textile relics, it is presumed that she wore short Jeogori[短衣, Dan-eui] with long sleeves and two layered skirt, and Dan-ryeong(團領) could be added as attachment that is reflective of the time era. For making design costume, Ra[羅, silk gauze] was used for long Dan-ryeong, plain silk and brocade[錦, Geum] for Dan-eui and skirt as a special textile of this period. Waist dart and small snap were added to the costume of ball-jointed doll because of hardness and curvy shape of doll's body, without contradicting traditional value. For better use of this study and cost reduction purposes, development of production system for traditional doll costumes should be considered.

• Fashion & Textile Research Journal
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• v.25 no.3
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• pp.346-357
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• 2023

The purpose of this study is to develop clothing customized for dealing with patients with severe dementia. Based on the results of previous studies, The research patient clothing was designed to reduce the physical fatigue experienced by caregivers when dressing and undressing patients by changing the position and shape of the split in the patient's clothing. This study used qualitative and quantitative methods to measure the extent to which these modifications improved the ease of dressing and undressing the research patient. The research patient clothing was developed by moving the rear-center zipper to the side and changing the zipper from being half-open to fully open. Muscle energy consumption and fatigue generation were analyzed using EMG signals at the following sites: brachioradialis, biceps, triceps, anterior deltoid, medial deltoid, posterior deltoid, upper trapezius and erector spinae. Results indicated that the modified research patient clothing required less muscle energy and the occurrence of muscle fatigue decreased overall compared to traditional patient clothing. This was supported by the qualitative subjective evaluation, which revealed that dressing and undressing was easier with the modified clothing. In conclusion, repositioning of the back zipper to the side and the fully open slit shape significantly reduced caregiver fatigue when dressing and undressing patients.