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서성규,이정섭,송준석 國立麗水大學校 環境問題硏究所 2004 環境硏究論文集 Vol.6 No.-
This study was investigated the effects of various system parameters on the absorption of carbon dioxide into absorption solution. An aqueous potassium carbonate solution was used as a chemical absorbent in order to figure out the effect of chemical reaction. For this purpose, the chemical analysis of potassium carbonate solution was performed. The changes of pressure, temperature, K₂CO₃solution flow/feed gas ratio and solution concentration in the absorber and the changes of pressure and temperature in the stripper were also analyzed. The analysis result shows that K₂CO₃ concentration in potassium carbonate solution was 99.6%. The optimum pressure was found to be 27.0㎏/㎠ and the optimum temperature was to be 68℃, the optimum concentration of potassium carbonate solution was to be 26.0wt% in the absorber. The CO₂ leakage decreased with the increment of the K₂CO₃ solution flow/feed gas ratio. But the H₂ leakage in the CO₂ product increased at or above the K₂CO₃ solution flow/feed gas ratio of 1.10. This H₂ leakage induced by the loss of ammonia production. The effects of the changes of the operation condition of the CO₂ stripper to the K₂CO₃ conversion are as follows. The K₂CO₃ conversion decreased as the pressure decreased. The K₂CO₃ conversion increased as the temperature increased. However, increasing the temperature without decreasing the pressure did not bring positive effect. The optimum pressure was found to be 0.45㎏/㎠.
25-Gb/s Clocked Pluggable Optics for High-Density Data Center Interconnections
Jeong, Gyu-Seob,Hwang, Jeongho,Choi, Hong-Seok,Do, Hyungrok,Koh, Daehyun,Yun, Daeyoung,Lee, Jinhyung,Park, Kwanseo,Ko, Han-Gon,Lee, Kwangho,Joo, Jiho,Kim, Gyungock,Jeong, Deog-Kyoon IEEE 2018 IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS PART 2 E Vol.65 No.10
<P>This brief presents a clocked pluggable optics suitable for high-density data center interconnections. The proposed architecture performs a SERDES function at the module side by exploiting a forwarded clock from the ASIC. Due to the relaxed channel loss of the ASIC-to-module interface, the use of power-hungry equalizers can be avoided. Based on an 850-nm multi-mode fiber interface, a 25-Gb/s link operation is demonstrated. A vertical-cavity surface-emitting laser-based transmitter outputs an optical modulation power of 0.6 mW. The optical receiver sensitivity is measured to be −7.5 dBm at 21.2 Gb/s with an optical excitation, and <TEX>$120~{\mu }\text{A}_{\text{pp}}$</TEX> at 25 Gb/s with an electrical excitation. The jitter tracking capability of the implemented clock and data recovery is evaluated in the presence of ±100-ppm frequency offsets and the measured jitter tolerance complies with the 100 GbE specification well. The optical transceiver is implemented in 65-nm CMOS technology and consumes 281 mW at 25 Gb/s, corresponding to the energy efficiency of 11.2 pJ/b.</P>
Jeong, Gyu-Seob,Kim, Wooseok,Park, Jaejin,Kim, Taeik,Park, Hojin,Jeong, Deog-Kyoon IEEE 2017 IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS PART 2 E Vol.64 No.6
<P>This brief illustrates the design of an inductorless high-speed clock generator. Compared to inductance-capacitance (LC) oscillators, ring oscillators are used in order to achieve a wide frequency-tuning range with a small chip area. By employing a cascaded phase-locked loop (PLL) architecture, the phase noise of the oscillator can be effectively suppressed. The first PLL is implemented with high-voltage devices under 1.8-V supply to provide a clean reference for the second PLL. The second PLL consists of only low-voltage devices, with a supply voltage of 0.9 V for high-speed operation. Following the second PLL, a clock doubler multiplies the PLL output clock by a factor of 2, which avoids power-consuming high-frequency clock dividers. In order to minimize any mismatch effects, special layout techniques are employed for the second voltage-controlled oscillator and the clock doubler. The prototype chip was fabricated in 28-nm complementary metal oxide semiconductor (CMOS) technology, and it occupies an active area of only 0.015 mm(2). The proposed PLL achieves a maximum output frequency of 32 GHz and consumes a total power of 30 mW, exhibiting a power efficiency of 0.9 mW/GHz.</P>
Gyu-Hee Lee,Young Shin,Yeong-Il Chang,Jae-Hong Jeong,Kyu-Seob Chang,Man-Jin Oh 한국식품영양과학회 2002 Preventive Nutrition and Food Science Vol.7 No.4
Rice wine was prepared with medicinal plants or plant extracts to obtain a value added nutritious alcoholic tonics. Powders of ten medicinal plants (PTM) or aqueous extracts prepared from them (ATM) were added during the initial stage of fermentation. Aroma compounds of rice wine (control) and wines containing PTM or ATM were isolated by liquid-liquid continuous solvent extraction (LLCSE) and analyzed by gas chromatographyolfactometry and aroma extract dilution analysis (AEDA). Desirable aroma compounds: acetaldehyde (sweet, ethereal), benzaldehyde (sweet, fragrant), ethyl acetate (sweet) and ethyl octanoate (sweet, ethanolic) had the highest log₃-flavor dilution (FD) factors in ATM. Results of sensory evaluation demonstrated that intensities of undesirable aroma attributes, such as koji and yeasty notes in control, and raw medicinal herb notes in PTM, were lowest in wine with ATM. Wines made with ATM had the most attractive aroma attributes among the three different traditional Korean medicinal wines.
가정대체식품(HMR)의 선택속성이 신뢰, 고객만족 및 재구매 의도와의 관계 분석
정인영(Jeong, In-Young),채규진(Chae, Gyu-Jin),신충섭(Shin, Choung-Seob) 한국외식경영학회 2021 외식경영연구 Vol.24 No.5
본 연구에서는 가정대체식품(HMR)의 선택속성이 신뢰, 고객만족, 재구매 의도에 미치는 영향관계 연구를 진행하였다. 본 연구를 위해 기존 선행연구를 바탕으로 연구모형과 가설을 설정하여 실증분석을 실시하였다. 본 연구의 검증 결과는 다음과 같다. 첫째, 가정대체식품(HMR)의 선택속성 요인 중에서 어떤 변수가 신뢰에 영향을 미치는 가를 알아보기 위한 결과 건강성, 가격, 편리성은 정(+)의 영향을 미치고 맛, 다양성은 유의하지 않은 것으로 나타났다. 둘째, 신뢰가 고객만족에 유의한 영향을 미치는 가를 알아보기 위한 결과 고객만족에 정(+)의 영향을 미치는 것으로 나타났다. 셋째, 신뢰가 재구매 의도에 유의한 영향을 미치는 가를 알아보기 위한 결과 정(+)의 영향을 미치는 것으로 나타났다. 넷째, 고객만족이 재구매 의도에 유의한 영향을 미치는 가를 알아보기 위한 결과 정(+)의 영향을 미치는 것으로 나타났다. In this study, we conducted an impact study on the choice properties of Home Replacement Food (HMR) on trust, customer satisfaction, and repurchase intention. For this study, empirical analysis was conducted by establishing research models and hypotheses based on existing prior research. The verification results of this study are as follows. First, health, price, and convenience are shown to have a significant effect on confidence among the selection property factors of Home Replacement (HMR), and taste and diversity are not significant. Second, results to determine whether trust has a significant impact on customer satisfaction show that it has a positive effect on customer satisfaction. Third, it has been shown that trust has a significant effect on repurchase intentions. Fourth, it has been shown that customer satisfaction has a significant impact on repurchase intention.