• Archives of Plastic Surgery
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• v.49 no.1
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• pp.50-54
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• 2022

Background In recent years, the number of people riding stand-up electric scooters in South Korea has increased rapidly. This study analyzed the facial injury patterns associated with stand-up electric scooter-related trauma in patients who visited our emergency center. Methods In this retrospective review, we collected data from patients who had visited our emergency center for stand-up electric scooter-related trauma between January 1, 2018 and December 31, 2020. Results The average age of the patients was 26.7 years. Of the 73 patients, 47 were male and 26 were female, highlighting a male predominance. Seven patients were injured after alcohol consumption. None of the patients had worn helmets. Additionally, upon comparing the frequency of facial injuries according to the quarter of the year, the facial injury rate was higher in the second and third quarters than in the first and fourth quarters. Facial soft tissue injuries were classified into facial cosmetic subunits and analyzed according to their location. The highest number of injuries was on the chin (n=18, 20.9%). Of the 73 patients with stand-up electric scooter-related facial injuries, 16 had acute facial osseous fractures. The commonest acute facial osseous fractures were those of the orbit (n=7, 26.9%). Conclusions The patterns of facial trauma reported here can be helpful for quickly evaluating and treating patients with facial trauma related to stand-up electric scooters. Additionally, people riding stand-up electric scooters should be aware of the risks associated with facial trauma and the importance of wearing protective devices, such as helmets and masks.

• Proceedings of the KIEE Conference
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• 2006.07c
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• pp.1424-1425
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• 2006

A four-step rapid thermal annealing (RTA) process is proposed in order to improve the throughput and stabilize the process, compared to the six-step RTA process. Effects of annealing on the properties of a structure mode of CMOS process in both cases were investigated. The implanted dopant(As, $BF_2$ and Ti/TiN) movement in silicon during different rapid thermal annealing conditions was studied using secondary ion mass spectroscopy (SIMS) technique. These results show that the four-step RTA process significantly improves time effect and throughput (15%) by the condition of ramping up compared to the six-step RTA process.

• Journal of architectural history
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• v.30 no.4
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• pp.41-52
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• 2021

This study examines the Gyeongju Seokguram Grotto restoration project (1961-1962) by architect Kim Chung Up (1922-1988) and introduces the documents he wrote at the time of planning. The study highlights Kim's Plan attempt to adopt Buckminster Fuller's idea of the Geodesic Dome, while inheriting the architect Pai Ki Hyung's previous design plan which was nullified. As Seokguram Grotto's water leak and deterioration issues have been brought up, the four-times survey was carried out by experts team between 1958 and 1960, under Ministry of Education's direction. Pai designed an initial restoration plan based on the survey's result, which was a double-dome structure with a concrete film on the outer periphery as a way to protect Seokguram Grotto in January 1961. However, as drawbacks, such as the heavy load of the concrete dome, and non-installation of entrance hall, have been indicated in the review process, the Cultural Properties Committee rejected the plan. Subsequently, Kim was appointed as the supervisor of the second restoration project. Kim drew up a process management schedule to be implemented from August 1961 to December 1963 and designed the conception plans for the second restoration design. This study analyzes Kim's Plan by examining sketches, site plans, floor plans, and sections. Kim planned to maintain the idea of the double-dome structure proposed by Pai while applying Buckminster Fuller's idea of the Geodesic Dome. Kim planned to lighten the dome structure by applying a steel-frame Geodesic Dome so that the dome structure could be supported by its own. The study is expected to reclaim the omitted parts from Seokguram Grotto's historical description and Kim's careers.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2005.07a
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• pp.93-94
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• 2005

Cu metallization using electrochemical plating(ECP) has played an important role in back end of line(BEOL) interconnect formation. In this work, we studied the optimized copper thickness using Bottom-up Gap-fill in Cu ECP, which is closely related with the pattern dependencies in Cu ECP and Cu dual damascene process at 0.13 ${\mu}m$ technology node. In order to select an optimized Cu ECP thickness, we examined Cu ECP bulge, Cu CMP dishing and electrical properties of via hole and line trench over dual damascene patterned wafers split into different ECP Cu thickness.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.3
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• pp.1135-1147
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• 2013

This study is on the empirical results of correlation between start up education and experience before start up of a self employer entrepreneur with store and performance of the entrepreneur's store. Many latent self employers are lacking in education and experiences for start up. According to the result, first, practical education on start up influenced on entrepreneur's start up skill, and theoretical education influenced on entrepreneur's entrepreneurship. Second, entrepreneur's experience before start up influenced on both start up skill and entrepreneurship. Third, start up skill influenced on both financial and non financial performance of the entrepreneur's store. Finally, entrepreneurship influenced on both financial and non financial performance of the store.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.64 no.3
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• pp.433-437
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• 2015

We have designed and fabricated a low power and high linearity up down convertor for wireless repeaters using $0.35{\mu}m$ SiGe Bipolar CMOS technology. Repeater is composed of a wideband up/down converting mixer, programmable gain amplifiers (PGA), input buffer, LO buffer, filter driver amplifier and integer-N phase locked loop (PLL). As of the measurement results, OIP3 of the down conversion mixer and up conversion mixer are 32 dBm and 17.8 dBm, respectively. The total dynamic gain range is 31 dB with 1 dB gain step resolution. The adjacent channel leakage ratio (ACLR) is 59.9 dBc. The total power consumption is 240 mA at 3.3 V.

• Horticultural Science & Technology
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• v.35 no.4
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• pp.402-409
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• 2017

We performed seed germination tests to investigate the effects of seed sowing orientation on germination viability on peanut (Arachis hypogaea L.) sprouts. Specifically, we assessed the influence of seed sowing orientation on germination rate, seedling weight, and seedling length, as well as the seedling vigor index. The seeds were sown in oak tree sawdust at 3.0 cm depth. Four seed orientations were tested: vertical with the hypocotyl end down, vertical with the hypocotyl end up, horizontal with the hypocotyl end down, and horizontal with the hypocotyl end up. The mean seed germination percentages of the four seed orientations were significantly different (p < 0.01) and ranged from 25 to 91.7%. The vertical orientation with hypocotyl-end-down and hypocotyl-end-up orientations showed the highest (91.7%) and lowest (25%) germination rates, respectively. The vertical orientation with the hypocotyl end down produced the heaviest (4.9 g) seedlings and the longest hypocotyls (4.65 cm). This orientation also produced the longest true leaf + epycotyl (2.15 cm) and had the highest seedling vigor index (197.1). The seedlings had a straight growth pattern, whereas seedlings from seeds sown with the hypocotyl up had an awkward plumular hook shape. Taken together, to produce peanut sprouts, we recommend placing the seeds vertically with the hypocotyl end down because this orientation leads to a high germination rate, high biomass production, and high overall seedling quality.

• Journal of the Korean Society of Costume
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• v.53 no.1
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• pp.159-170
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• 2003

핀업은 제2차 세계대전기간동안 매력적인 여성들의 성적인 사진들을 군일들이 그들의 숙소 벽에 부착함으로서 생겨난 신조어이다. 이러한 핀업들은 영화의 발달로 인하여 헐리우드 스타들과 같은 발전된 형태로서 나타나게 됐으며, 그들의 스타일은 하나의 패션 트랜드를 만들었다. 본 연구의 목적은 핀업의 스타일을 역사적 관점에서 고찰하여 특성을 분석하며 핀업 스타일이 역사적으로 어떠한 변화를 통하여 오늘날의 현대패션까지 영향을 미치게 되었는가를 연구하는 것이다. 연구방법은 관련된 문헌고찰을 통한 역사학적 이론적 배경을 토대로 하여 핀업의 범주를 설정하고 관련자료를 수집하였다. 그리고 핀업 스타일의 공시적, 통시적 고찰, 역사적 변천과 특성을 분석하여 이들에 내재된 문화적 가치가 패션에 어떠한 영향을 미치고 있는지를 연구해보았다. 연구 결과 핀업 그 스스로는 역사적 고찰을 통하여 그 가치를 지니며, 핀업 스타일의 변화는 구조적으로 이루어지며, 구조는 세대와 취향에 따라 변화하며 패션에 지속적으로 영향을 미치고 있었다.

• Proceedings of the KIEE Conference
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• 1987.07a
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• pp.213-215
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• 1987

As a means of improving the reliability of the analog type controller for the thermal power plant, an efficient method is proposed, which is to place the hardware redundancy, i.e. a back-up controller with fault detecting capability. FTCS is implemented by using multi-processors and it is experimentally verified that the back-up controller takes over the role of the original controller, controlling the faulty loop.

• Journal of Korean Society of Water and Wastewater
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• v.27 no.1
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• pp.113-120
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• 2013

This study aimed to obtain quantitative data for WWTP operators in phosphorus removal process. This was done by reviewing and comparing phosphorus removal efficiency(%), coagulants dosage(Al/P and $Al_2O_3$(mg/L)), sludge production($kg/m^3$), and operation cost($won/m^3$) of start-up and normal operation data. Phosphorus removal efficiency of all tertiary treatment process was up to 70 ~ 89 % in start-up and normal operation. Average molar ratio(Al/P) was similar as 5 in both operations, but average coagulants dosage (mg/L) of start-up (8.5 mg/L) was higher than normal operation (6.2 mg/L). Average operation cost was higher for start-up ($33.6won/m^3$) than normal operation ($28.4won/m^3$), while electricity cost required for the normal operation ($9.0won/m^3$) was higher by $3.5won/m^3$.