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이정광 대한설비공학회 2001 설비저널 Vol.30 No.2
각종 설비 조립화 공법에 대하여 소개하고 특히 초고층건물에서의 P.F.P(pre fabricated piping)공법의 현장적용사례를 소개하고자 한다.
UTAUT2를 적용한 골프 애플리케이션 사용자 특성이 이용의도에 미치는 영향
이정광,남상백 한국체육과학회 2023 한국체육과학회지 Vol.32 No.2
The purpose of this study is to investigate the effect of user characteristics of the golf application to which the extended UTAUT2 is applied on the intention to use. To achieve the purpose of this study, domestic golf application users were selected as study subjects. A total of 355 questionnaires were collected, and 329 copies were finally used. The SPSS 27.0 and AMOS statistical analysis program was used as the data processing program, and confirmatory factor analysis, reliability analysis, correlation analysis, simple regression analysis, and multiple regression analysis were performed. The results of the study are as follows. First, habit had a significant effect on gender. Hedonic motivation had a significant effect on age and handicap. In the frequency of app use, performance expectations, effort expectations, social influence, hedonic motivation, and habits showed significant effects. Second, performance expectations, effort expectations, social influences, hedonic motives, and habits of UTAUT2 were found to have a statically significant effect on the intention to use, while promotion conditions and price effectiveness did not have a statistically significant effect. This study has academic significance in that it identified the influence of UTAUT2 sub-factors on intention to use according to the characteristics of golf application users.
부 스큐 지연 방식과 피드포워드 방식을 사용한 링 발진기의 대신호 해석
이정광(Jeong-Kwang Lee),이순재(Soon-Jai Yi),정항근(Hang-Geun Jeong) 대한전기학회 2010 전기학회논문지 Vol.59 No.7
This paper presents a large signal analysis of ring-type oscillators with feed forward and negative skewed delay scheme. The analysis yields the frequency increase factor due to two schemes. The large signal analysis is needed, because small signal model is limited to the initial stage of oscillation[1]. For verification of the frequency increase factor, simulation were done under the same conditions for the two different types of ring oscillators, i.e., with and without feed forward and negative skewed delay scheme. Simulation results are in good agreement with predictions based on analysis.
Sandwich technique을 이용한 하악골 증대술의 치험 보고
이지수,이정광,이현진,안미라,손동석,Lee, Ji-Soo,Lee, Jung-Kwang,Lee, Hyun-Jin,Ahn, Mi-Ra,Sohn, Dong-Seok 대한악안면성형재건외과학회 2008 Maxillofacial Plastic Reconstructive Surgery Vol.30 No.3
Objective: This is to report the efficacy of the sandwich technique for bone augmentation in a moderate atrophic posterior mandible through clinical and histological results in two cases. Subjects and Method: Two patients selected had moderate bone resorption in left lower edentulous area. Sandwich osteotomy using the piezosurgery was performed and the osteomized alveolar segments were elevated by 6mm in each two patients. The interpositional mineral allograft materials were inserted in the atrophic posterior mandibles. After four months healing period, bone biopsies in the grafted areas and placement of dental implants were performed. In both cases, panoramic views were taken preoperatively to measure the alveolar bone height for diagnosis, to monitor patient healing, and to evaluate bone healing and bone gain. Results: Sufficient vertical bone height was gained by using the sandwich technique and implants were placed successfully. In radiological evaluation, there was minimal resorption of bone height after the second operation and in histomorphometric evaluation, they showed favorable new bone formation without inflammation in the grafted areas. Conclusion: The sandwich technique can be an effective choice for augmenting vertical bone height in the atrophic mandible. More of cases and long term follow-up are needed to evaluate bone resorption and implant prognosis.
Mono Sodium Glutamate 발효로 얻은 GABA 코팅 쌀에 의한 수면유도 효과
김옥주 ( Ok Ju Kim ),이정광 ( Jeong Kwang Lee ),우영민 ( Young Min Woo ),최승태 ( Seung Tae Choi ),박미연 ( Mi Yeon Park ),김안드레 ( Andre Kim ),하종명 ( Jong Myung Ha ) 한국공업화학회 2013 공업화학 Vol.24 No.6
Gamma-aminobutyric acid (GABA) is a non-protein amino acid widely present in organisms, which has shown several important physiological functions such as neurotransmission, hypotension induction, as well as diuretic and tranquilizer effects. They have also been extensively used in food industry. GABA contents in the grain and brown rice are about 1∼4 mg/100 g and 4∼8 mg/100 g, respectively but it is difficult to expect physiological activity from such low amounts of natural food intake. We investigate the effects of GABA-coated rice on the secretion of melatonin and serotonin which both have been used as sleep inductive compounds. As a result, the secretion of melatonin and serotonin from mice were found to be 3.578 ± 0.158 pg/mL, 5.918 ± 0.169 ng/mL respectively. The melatonin and serotonin in mice increased significantly up to the 8.7 and 22.8 times respectively, when compared to that of the rice, but there was no cumulative effects. Due to the continuous intake of GABA-coated rice, which was developed as a functional food nutrient, inductive effects of melatonin and serotonin from general rice could be achieved and also the similar effect as taking up directly 25 mg/mL of GABA could be obtained.
위상 고정 루프의 기준 스퍼를 감소시키기 위한 이중 보상 방식 전하 펌프
이동건(Dong-Keon Lee),이정광(Jeong-Kwang Lee),정항근(Hang-Geun Jeong) 대한전기학회 2010 전기학회논문지 Vol.59 No.2
The charge pump in a phase-locked loop is a key block in determining reference spurs of the VCO output signal. To reduce reference spurs, the current mismatch in the charge pump must be minimized. This paper presents a dual compensation method to reduce the current mismatch. The proposed charge pump and PLL were realized in a 0.18㎛ CMOS process. Measured current matching characteristics were achieved with less than 1.4% difference and with the current variation of 3.8% in the pump current over the charge pump output voltage range of 0.35-1.35V at 1.8V. The reference spur of the PLL based on the proposed charge pump was measured to be -71dBc.