• The Research Journal of the Costume Culture
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• v.9 no.5
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• pp.712-722
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• 2001

The purpose of this study is to classify of the Hair ornaments in old tombs of the Three Kingdom States. Hair ornaments was divided into Combs, Rod-like hairpins, Chae[;釵], Boyo[;步搖] Combs were 2 type in according to the tooth's space, wide-tooth comb[;梳] and fine-tooth comb(;比). The general name of two type was called Jeul(;櫛). Combs were excavated from the only ancient Silla tombs. Rod-like hairpins were called Gha(叉) or Jam(:簪). They were found in most of the old tombs in Goauryeo, Baekje, ancient Silla tombs. The style was L-type and embellished circular head-type. Chae(;釵) was understand Cha(:叉) that had two tongs. Chae(:釵) was generally U-type and rarely hairtweezers -type. Jakchae(;爵釵) was understand distinctive Chae(;釵) hanged with phoenix. This type was excavated from the only Baekje tombs of King of Muryeong. Boyo(;步搖) was originally a hair decoration of the northern nomadic tribes which had been introduced to the Wijin period. Boyo gained its popularity by the women in Dang Dynasty, hair ornaments were considered indicators of status and wealth. Boyo(;步搖) hair accessory features of which are suspended from a elaborate hairpin structure. Such pieces were designed to sway as their wearer walked. The bequest was not found, but we catch the Boyo(; 步搖) that was women'head decoration in painting of old tombs in Goguryeo.

• Electronics and Telecommunications Trends
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• v.34 no.5
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• pp.91-98
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• 2019

Optical frequency comb generators have been investigated as a signal source capable of generating highly stabilized ultrafast pulse lasers. The precise control of the optical frequency comb spacing by RF clock signals has led to a revolutionary paradigm shift in the precise measurement of time and frequency. Optical frequency combs also have advantages such as stable frequency spacing, stable number of lines, and robustness. Owing to these characteristics, optical frequency combs have been applied to the fields of high precision optical clock, communication, spectroscopy, waveform generation, and astronomy. In this article, we introduce the properties (i.e., generation methods, advantages, and so on) of various optical frequency combs, and discuss the expected future technological trends and applications.

• Korean Journal of Optics and Photonics
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• v.34 no.6
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• pp.225-234
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• 2023

Mode-locked pulse lasers have a temporal periodicity up over a short period of time. However, in the time-frequency domain, a pulsed laser with temporal periodicity is described as an optical frequency comb with constant frequency spacing. Each frequency component of the optical frequency comb in the frequency domain is then a continuous-wave (CW) laser with hundreds of thousands of single-frequency-component CW lasers in the time domain. This optical frequency comb was developed approximately 20 years ago, enabling the development of the world's most precise atomic clocks and precise transmission of highly stable optical frequency references. In this review, research on the selective extraction of the single-frequency components of optical frequency combs and the control of the frequency components of optical combs is introduced. By presenting the concepts and principles of these optical frequency combs in a tutorial format, we hope to help readers understand the properties of light in the time-frequency domain and develop various applications using optical frequency combs.

• Journal of the Optical Society of Korea
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• v.18 no.5
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• pp.449-452
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• 2014

We present a multi-tap microwave photonic filter with high selectivity through applying time-to-frequency mapping and optical frequency comb shaping techniques. When arranged in the time-to-frequency mapping stage, by a Fourier transform, the deviation of the optical taps to the target profile is significantly reduced while maintaining the apodization profile, resulting in high sidelobe suppression in the filters. By applying a simple time-to-frequency mapping stage to the conventional optical frequency combs, we demonstrate a substantially enhanced (>10dB) sidelobe suppression, resulting in filter lineshapes exhibiting a significantly high (>40dB) main lobe to sidelobe suppression ratio. These results highlight the potential of the technique for implementation in various passband filters with high sidelobe suppression.

• Journal of the Optical Society of Korea
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• v.11 no.3
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• pp.124-129
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• 2007

For the first time we compare two kinds of optical frequency combs, one of which is based on a Ti:sapphire femtosecond laser and the other is based on a mode-locked erbium-doped fiber laser. The comparison is performed by measuring an optical frequency standard with these two combs simultaneously. The two frequency measurements agree within 1.8 Hz ($3.8{\times}10^{-15}$) with the uncertainty of 17.2 Hz ($3.6{\times}10^{-14}$), from which it can be concluded that the Ti:sapphire-based frequency comb and the fiber-based frequency comb have no systematic discrepancy at this level of uncertainty.

• The Research Journal of the Costume Culture
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• v.2 no.2
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• pp.247-263
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• 1994

This study is concerned with the slsl 瑟瑟. The identity, origins of the word, kinds, the place of production, and the sues of he sl sl were examined. The world sl sl means the sapphire. The Chinese word se se(seh seh), 瑟瑟 was derived from the Hebrew word, she she meaning marble. The use, meaning and the phonetic value of the sl sl between the Chinese and the Hebrew were the same each other. It indicates that the Chinese word se se(seh seh) was the transliteration of the Hebrew word she she. The sl sl were produced in the Middle East Asia and the sl sl used in ancient China was mainly originated from the Middle East Asia. The sl sl of Silla was also the sapphire and it was an article of the imported goods from the Middle East Asia. Women of Jin gol(true bone) were not use the sl sl as a material to decorate for their combs and headdresses. Also women of yuk du pum (six du pum) were prohibited to use the sl sl as a material for their combs. It indicates that the privilege to use the sl sl for a comb and in a head dress was restricted to the queen in Silla and it remained as a symbol of nobility and dignity.

• Macromolecular Research
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• v.15 no.2
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• pp.173-177
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• 2007

Living anionic and cationic polymerizations have been combined to prepare various types of comb-like copolymers composed of polystyrene (PS) and polyisoprene (PI) blocks, with a precisely controlled architecture. According to the relative placement of these elementary building blocks, combs with randomly distributed PS and PI or with poly(styrene-b-isoprene) diblock branches (I & II, respectively) can be prepared. The reaction procedure initially includes the synthesis of a poly(chloroethylvinyl ether) using living cationic polymerization, which is used as the reactive backbone to successively graft $PS^-Li^+$ and $PI^-Li^+$ or $PI-b-PS^-Li^+$ to obtain structures (I) or (II). The synthesis of Janus-type PS-comb-b-PI-combs (III) initially involves the synthesis of a diblock backbone using living cationic polymerization, which bears two distinct reactive functions having either a protected or activated form. Living $PS^-Li^+$ and $PI^-Li^+$ are then grafted, in two separate steps, onto each of the reactive functions of the backbone, respectively.

• Journal of the Korean Society of Costume
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• v.31
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• pp.215-222
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• 1997

This is a study on Sil-Sil and Chun. Sil-Sil is a kind of turquoise. According to its burial place and use its identity was fixed, It was discovered in the Middle-East Asia like Iran and Tibet, Ancient China imported turquoise from these countries,. Korea also imported it in Shilla period. It was the empresses only who had the priviledge of using Sil-Sil for their ornaments such as hair-pins headdresses and combs. Chun was a sort of metal ornaments. Chun required a high-skilled work' and it showed how advanced its skill at that time.

• Korean journal of applied entomology
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• v.33 no.4
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• pp.216-224
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• 1994

Sex combs which lack in females are characteristic of some members of the subgenus Sophophora When present, they can be van/ from a single blistle to very extensive structures, but the meianogaster subgroup of the subgenus Sophophora have only on the f~rst tarsal segments of the fore legs. D mauritiona among the melanogaster compler of the melar~ogaster subgroup have significantly more sex comb teeth (mean 12.75) than other specie& and the yakubo complex (range of the mean 6.84-758) have less than the melanogaster complex (range of the mean 835-12.75). In sex comb tooth number of interspecd~ch ybrids among the melonogoster complex, there appeared difference u;ith parental species Thus, analysis of male sex comb tooth in FI hybrid could not exhibit the direction of hereditan/ nature. On the other hand, D auraria (the montium subgroup), D suzuki (the suzuki subgroup) and D, lutecens (the takohashii subgroup) of the melanogaster species have two sex combs on the first and second tarsal segments, and the mean number were different according to the species.

• Journal of Sensor Science and Technology
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• v.13 no.2
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• pp.101-109
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• 2004

This paper presents a novel z-axis accelerometer with perfectly aligned vertical combs fabricated using the extended sacrificial bulk micromachining (extended SBM) process. The z-axis accelerometer is fabricated using only one (111) SOI wafer and two photo masks without wafer bonding or CMP processes as used by other research efforts that involve vertical combs. In our process, there is no misalignment in lateral gap between the upper and lower comb electrodes, because all critical dimensions including lateral gaps are defined using only one mask. The fabricated accelerometer has the structure thickness of $30{\mu}m$, the vertical offset of $12{\mu}m$, and lateral gap between electrodes of $4{\mu}m$. Torsional springs and asymmetric proof mass produce a vertical displacement when an external z-axis acceleration is applied, and capacitance change due to the vertical displacement of the comb is detected by charge-to-voltage converter. The signal-to-noise ratio of the modulated and demodulated output signal is 80 dB and 76.5 dB, respectively. The noise equivalent input acceleration resolution of the modulated and demodulated output signal is calculated to be $500{\mu}g$ and $748{\mu}g$. The scale factor and linearity of the accelerometer are measured to be 1.1 mV/g and 1.18% FSO, respectively.