Ultra-High-Speed Motor Design to Reduce Inductance Voltage Drop through Permanent Magnet Overhang Structure

So-Yeon Im(임소연),Jae-Hyun Kim(김재현),Moo-Hyun Sung(성무현),Myung-Seop Lim(임명섭) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11

Since the motor is driven by an inverter, it is essential to design the motor in consideration of electrical specifications. The DC link voltage limits the fundamental armature voltage of the motor. Ultra-high-speed motors have large voltage drop due to inductance. In order to satisfy the voltage-limit condition, a permanent magnet (PM) overhang structure can be considered to reduce the inductance voltage drop. Since back-electromotive force (EMF) increases when the PM overhang structure is applied, the stack length may be reduced at the same level as back-EMF. Accordingly, the inductance voltage drop is reduced due to the reduction of the stack length. In particular, since surfaced-mounted synchronous motor (SPMSM) does not generate reluctance torque, the same output torque can be maintained even when the inductance is reduced through a PM overhang structure. The PM overhang factor is used to reduce the computation time by reflecting the effect of the PM overhang structure in the 2-dimensional finite element analysis. Accordingly, the distributed winding SPMSM is designed to reduce the inductance by reflecting the PM overhang factor.

대두 추출물의 Daidzin 및 Glycitin의 동시분석

임소연 ( So Yeon Im ),정경옥 ( Kyoung Ok Jeong ),이정호 ( Jeong Ho Lee ) 한국키틴키토산학회 2021 한국키틴키토산학회지 Vol.26 No.1

대두 추출물의 daidzin과 glycitin을 HPLC를 이용하여 동시분석하였다. HPLC 분석용매는 water/MeOH/acetic acid (88:10:2)와 MeOH/acetic acid (98:2)를 사용하여 C18 MGII컬럼 (4.6 × 250 mm, 5 μm), 유속 1.0 mL/min, 시료 10 μL를 주입하여 컬럼온도 40℃, PDA detector 검출파장 260 nm에서 검출 한계, 정량 한계, 정밀도, 정확성 및 회수율을 측정하였다. Daidzin과 glycitin 표준용액과 대두 추출물은 다른 물질의 간섭 없이 분리되었으며, 검출시간 및 피크 유지시간과 일치하는 스펙트럼이 나타났다. 검량선의 상관계수(R²)는 0.9999의 직선성이 나타났다. Daidzin의 검출한계는 0.1211 μg/mL, 정량한계는 0.3670 μg/mL, glycitin의 검출한계는 0.0493 μg/mL, 정량한계는 0.1494 μg/mL이었으며, 회수율은 daidzin는 97.36-100.29%, glycitin은 83.67-85.39%이었다. 일간 정밀성은 daidzin에서 1.3120 ± 0.0199 - 1.3348 ± 0.0070 mg/g (RSD 0.5214 - 2.2882%), glycitin은 0.4816 ± 0.0026 -0.4895 ± 0.0111 mg/g (RSD 0.5472 - 2.2752%)으로 분석되었다. 실험실내 정밀성은 daidzin에서 1.33762 ± 0.0079 mg/g (RSD 0.5923%), glycitin은 0.4913 ± 0.0101 mg/g (RSD는2.0549%)으로 나타났다. 대두를 추출온도 및 추출시간을 달리하여 추출한 추출물의 daidzin, glycitin의 함량을 측정한 결과 90℃, 3시간 추출물에서 daidzin의 함량이 0.70 ± 0.01 mg/g, glycitin의 함량이 0.25 ± 0.01 mg/g으로 분석되었으며, 추출 온도 및 추출 시간이 증가함에 daidzin과 glycitin의 함량도 증가하였다. 본 분석방법은 HPLC를 이용하여 대두 추출물의 daidzin과 glycitin를 동시에 분석할 수 있는 기초자료라 판단된다. Simultaneous analysis of daidzin and glycitin, the marker compound of soybean extract, was performed using HPLC. HPLC was analyzed with gradient elution of water/MeOH/acetic acid (88:10:2) and MeOH/acetic acid (98:2) and flow rate 1.0 mL/min, C18 MGII column (4.6 × 250 mm, 5 μm), column temperature 40oC, PDA detector 260 nm. Daidzin and glycitin was validated for its limit of detection (LOD), limit of quantitation (LOQ), precision, accuracy and recovery by HPLC relative to soybean extract. Daidzin, glycitin standard solution and soybean extract were separated without interference from other substances, and spectrum consistent with the peak retention time appeared. It showed a high linearity in calibration curve with coefficient of correlation (R2) 0.9999. The LOD of daidzin and glycitin were 0.1211 μg/mL, 0.0493 μg/mL, LOQ of daidzin and glycitin were 0.3670 μg/mL, 0.1494 μg/mL, respectively. Inter-day precision of daidzin and glycitin were 1.3120±0.0199- 1.3348±0.0070 mg/g (RSD 0.5214-2.2882%) and 0.4816±0.0026-0.4895±0.0111 mg/g (RSD 0.5472-2.2752%). Intermediate precision of daidzin and glycitin were 1.33762±0.0079 mg/g (RSD 0.5923%) and 0.4913±0.0101 mg/g (RSD 2.0549%). Daidzin 0.70±0.01 mg/g and glycitin 0.25±0.01 mg/g were analyzed in soybean extract extracted at 90oC for 3 h. As the extraction temperature and extraction time were increased, the contents of daidzin and glycitin also increased. This result confirmed that simultaneous analysis of daidzin and glycitin of soybean extract was possible using HPLC.

A Priority of Documentary Films` Success Factor: AHP Analysis

So-Yeon Im(임소연),Yun-Cheol Lee(이윤철) 한국콘텐츠학회 2017 한국콘텐츠학회논문지 Vol.17 No.12

한국다큐멘터리영화가 2010년대 접어들면서 황금기를 맞고 있는 지금, 어느 때보다도 다큐멘터리영화의 성공에 대한 관심이 집중되고 있다. 본 연구는 이에 부응하여 처음으로 다큐멘터리영화의 성공요인에 관한 연구를 진행했다. 리트만(Litman)의 영화흥행요인 세 가지 카테고리인 창조적 영역, 배급유통의 영역, 마케팅 영역에 맞게, 한국다큐멘터리영화의 사례를 접목하여, 전문가의 의견을 통한 검증작업을 거쳐 다큐멘터리영화의 12개의 성공요인을 도출했다. 또한 AHP분석기법을 적용, 다큐멘터리영화의 성공요인의 중요도를 살펴보았는데, 가장 중요한 성공요인은 창조적 영역의 영화자체가 가지는 완성도로 나타났고, 보편적 소재의 다큐멘터리는 배급, 마케팅의 요인을, 정치사회적 소재의 다큐멘터리는 전체적으로 정부의 지원과 인프라구축의 요인을 중요하게 평가했다. 온라인을 통한 참여관객의 현상을, 제작군은 높게, 배급,마케팅군은 상대적으로 낮게 평가하는 인식의 차이를 보였다. 이러한 성공요인과 우선순위는 다큐멘터리영화 관련한 여러 분야에서 기초 자료로 활용될 것이며, 다큐멘터리 영화 실무자나 정책입안자, 그리고 연구자들에게 중요한 시사점을 줄 수 있다. A golden age for Korean documentary films has begun in the 2010s. At present, the success of documentary film is attracting interest than any time in history. To meet the timely demand, the present study conducted research on success factors of documentary films for the first time. This study adopted the three categories of Litman’s film success factors (creative domain, distribution domain, and marketing domain) and integrated to the cases of Korean documentary films to extract 12 success factors of documentary films through experts’ validation process. Moreover, this study applied AHP method and examined the relative importance of success factors of documentary films. The result was as follows. The significant success factors mostly were found within creative domain. Documentaries that feature common themes rated the distribution/marketing factors highly whereas documentaries that cover socio-political themes rated highly the governments funding and infrastructure building. With regard to the online phenomenon of participating viewer, there was a gap in perception: the production field rated it high while the distribution/marketing field rated it relatively low. These success factors and priority will be used as baseline data in diverse fields related to documentary films, and provide significant implications to documentary film staff, policy makers, and researchers.

AI 기반 수요예측알고리즘 모니터링 UI 디자인 방안 연구

임소연(So-Yeon Im),이효원(Hyo-won-Lee),김성호(Kim-seong Ho),이승준(Seung-jun Lee),이영우(Young-woo-Lee),박철우(Cheol-woo Park) 한국정보통신학회 2022 한국정보통신학회 종합학술대회 논문집 Vol.26 No.2

Asymmetric Motor Design Process with High-Efficiency and Low Torque Ripple for Electric Vehicles

So-Yeon Im(임소연),Ji-Hyun Lee(이지현),Myung-Seop Lim(임명섭) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5

To design a high-efficiency electric vehicle traction motor with a low torque ripple, the optimal design for the asymmetric structure of the motor is performed. Sensitivity is analyzed to select response-sensitive variables among the shape parameters of the motor increased due to the asymmetric structure. Through the sensitivity analysis result, the optimal design process is proposed that can reduce the computation time and at the same time secure the reliability of the optimization result. The motor designed through the proposed process has advantages over the initial model in terms of average efficiency and torque ripple.

360 VR 기반 2D 이미지 활용 방안 연구

임소연(So-Yeon Im),이준영(Junyeong Lee),박철우(Cheol-woo Park),이영우(Young-woo-Lee) 한국정보통신학회 2022 한국정보통신학회 종합학술대회 논문집 Vol.26 No.2

수소 전기차 공기압축기용 초고속 모터의 PWM 고조파 전류에 대한 온도 특성 예측

임소연(So-Yeon Im),박수환(Soo-Hwan Park),김재현(Jae-Hyun Kim),임명섭(Myung-Seop Lim) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6

The fuel cell electric vehicle’s air compressor is driven by an ultra-high-speed(UHS) surface-mounted permanent magnet synchronous motor(SPMSM). UHS SPMSM has a large electromagnetic losses due to high rotational speed. Motor losses increase the temperature inside the motor. Increased motor temperature can cause deterioration in motor performance. In addition, since the motor is driven by an inverter, pulse width modulation(PWM) harmonic current is input to the motor. Since the PWM harmonic current increases the electromagnetic losses of the motor, it is necessary to analyze the effect of the PWM harmonic current on the temperature distribution of the motor. In this paper, the inverter simulation is conducted to predict the PWM harmonic current waveform, and the temperature distribution of the motor due to the PWM harmonic current is predicted through the lumped parameter thermal network (LPTN).

다큐멘터리영화의 성공을 결정짓는 요인에 관한 비교사례연구

임소연(So-Yeon Im),이윤철(Yun-Cheol Lee) 한국콘텐츠학회 2017 한국콘텐츠학회논문지 Vol.17 No.10

최근 다큐멘터리 영화의 대중적 성공작들이 나타남에 따라 그 요인에 대한 관심이 대두되고 있다. 이에 본 연구는 보편적 메시지로 대중성을 확장한 〈님아, 그 강을 건너지 마오>와 강한 정치적 메시지를 담은 〈두 개의 문〉의 사례를 통해 다큐멘터리 영화의 흥행요인을 규명하고자 했다. 이를 위해 Litman and Kohl(1989)이 제시한 영화 흥행요인 구분인 창조적 영역, 배급유통영역, 마케팅 영역을 기준으로 두 영화의 제작, 배급 담당자들의 인터뷰를 기반하여 사례분석을 이루었다. 분석결과, 강렬한 인물이나 사건 등의 실화 소재, 영화의 참신한 시선과 메시지, 영화적 완성도, 영화성격에 맞는 배급전략, 시의적 시기에 상영, 적절한 홍보, 광고 전략이 두 영화의 공통된 흥행요인임을 확인할 수 있었다. 이외에도 〈님아, 그 강을 건너지 마오〉는 민간투자로 인해 배급과 마케팅 비용이 풍부했던 점과 와이드릴리즈배급전략이 유효했고, 〈두 개의 문〉은 정부의 개봉지원과 그리고 참여관객이라는 특수한 요인이 흥행에 영향을 미쳤음을 알 수 있었다. 이와 같이 본 연구는 다큐멘터리 영화의 흥행 요인을 규명하고, 이에 따른 전략적 작용에 대한 방안을 구체적으로 도출함으로써 다큐멘터리 영화의 대중화를 위한 시사점을 제시하고자 했다. After a few recent documentary films had commercial success, factors for their success are getting attention. This paper explores the factors of the financial success of two documentary films. “My Love, Don’t Cross That River” gained extended popularity with its universal message, and “Two Doors” conveyed a poweful political message. This paper conducted a case study by inteviewing production directors and distribution managers. Analysis was based on the three categories suggested by Litman and Kohl(1989): creative sphere, distribution-scheduling release pattern, and marketing efforts. Findings present the common factors of the two movies’ success in the following areas: persons and events showing a powerful reality, a message with new and fresh insight, artistic quality, distribution strategy with timely scheduling, release time (period), public relations, and advertising.. In addition, “My Love, Don’t Cross That River” was helped by a sufficient budget for scheduling/releasing and advertising. Its wide-release stratergy worked as well. “Two Doors” was aided by the government support for release and by the special factor called ‘Participating viewer’. By examining the factors of documentary films’ commercial success, this study has an implication for the popularization of documentary movies by indicating how to strategically apply relevant factors.

산수유 추출조건에 따른 Loganin 함량 분석 및 활성 평가

임소연 ( So Yeon Im ),정경옥 ( Kyoung Ok Jeong ),이정호 ( Jeong Ho Lee ) 한국키틴키토산학회 2020 한국키틴키토산학회지 Vol.25 No.3

산수유는 인체 건강에 유익하여 전북지역에서 재배가 증가하고 있어 기능성식품을 개발하고자 loganin의 함량과 항산화, 항당뇨 및 항염 활성, 일반성분을 분석하였다. 산수유에 함유된 loganin 함량을 분석한 결과 3시간, 100℃ 추출물에서 7.68 ± 0.06 mg/g, 9시간 100℃ 추출물에서 7.88 ± 0.04 mg/g 분석되었으며, 추출시간 및 추출온도가 증가함에 따라 loganin 함량도 증가하였다. 산수유 100oC 3시간 추출물 1,000 μg/mL에서 DPPH 라디칼 소거활성은 53.58 ± 3.35%, ABTS 라디칼 소거활성은 18.22 ± 0.62%, SOD 효소 활성은 69.6 ± 7.42%으로 측정되었으며, 추출물의 처리농도가 증가함에 따라 항산화 활성도 증가하였다. 세포 독성은 나타나지 않았으며, NO 생성 저해 활성은 1 μg/mL에서 12.88 ± 0.24, 10 μg/mL 12.89 ± 0.96으로 저해되었다. α-Glucosidase 저해 활성은 1,000 μg/mL에서 98.9 ± 5.95%, 500 μg/mL에서 91.9 ± 5.28%으로 분석되었다. 일반 성분은 열량 344.94 kcal/100 g, 탄수화물 80.83% 조단백질 3.29%, 조지방 0.94%, 총당 347.61 mg/g으로 분석되었다. 산수유에는 loganin이 함유되어 있고 항산화, 항암, 항당뇨 활성이 있어 기능성 소재로 개발이 가능할 것으로 판단된다. The aim of this study was to investigate the potential of Cornus officinals as a content of protocatechuic acid and physiological activities. The analyzed the content of protocatechuic acid of Cornus officinals water extracts according to different extract temperature and time for extraction. It was analyzed as 7.68 ± 0.06 mg/g in the extract at 100℃ for 3 h. Protocatechuic acid content increased as extraction time and temperature increased. The activity of the Cornus officinals water extract at 100℃ for 3 h was measured. Antioxidant activity against the concentration of Cornus officinals water extract 1,000 μg/mL was measured. DPPH radical scavenging activity was measured at 53.58 ± 3.35%, ABTS radical scavenging activity at 18.22 ± 0.62%, and SOD activity at 69.6 ± 7.42%, antioxidant activity also increased as the processing concentration of extracts increased. Cell viability was shown for RAW 264.7 cells, and nitric oxide(NO) production was also inhibited. The α-Glucosidase inhibitory activity was determined to be 98.9 ± 4.45% at concentration of 1000 μg/mL. The nutritional components were analyzed to be 344.94 kcal/100g of calories, 80.83% of carbohydrates, 3.29% of crude protein, 0.94% of crude fat, and 347.61 mg/g of total sugars. Cornus officinals is thought to be developed as a functional food material because it contains protocatechuic acid and has antioxidant activity, anti-inflammatory and antidiabetic activity.

열등가회로를 이용한 수냉식 초고속 모터의 온도 분포 예측

임소연(So-Yeon Im),김동민(Dong-Min Kim),진준우(Jun-Woo Chin),김기오(Ki-O Kim),임명섭(Myung-Seop Lim) 대한전기학회 2020 대한전기학회 학술대회 논문집 Vol.2020 No.7