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A phosphodiesterase-5 inhibitor as a potential therapeutic effector following mild ischemic stroke
Juhyeon Kang,Yeon Hee Yu,Kahyun Lee,Gangho Kim,Jaehyeon Park,Kyounguk Lee,Hansol Lee,Whiin Lee,Seungwon Choi,Dae-Young Yoo,In Koo Hwang,Dae-Kyoon Park,Kyung-Ho Park,Man-Ryul Lee,Jae-Sang Oh,Duk-Soo Ki 대한체질인류학회 2018 대한체질인류학회 학술대회 연제 초록 Vol.61 No.-
Single-Phase Inverter Drive for Interior Permanent Magnet Machines
Lee, Kahyun,Ha, Jung-Ik Institute of Electrical and Electronics Engineers 2017 IEEE transactions on power electronics Vol. No.
<P>This paper proposes a novel drive method for interior permanent magnet machines (IPMMs). In the proposed system, a two-phase IPMM is fed from a single-phase H-bridge inverter for low-cost applications. Its main winding in d-axis is connected to the inverter and the auxiliary winding in q-axis is inherently short circuited. This configuration enables the motor to operate in a wider speed range with higher energy efficiency than most other single-phase drive systems. Also, its torque capability in the high-speed range is as high as that of the three-phase IPMM drive despite the reduced power devices, drivers, and current sensors. Accordingly, the proposed system has benefits such as simple structure, low cost, high-power density, and improved efficiency. In this paper, the system is modeled with an equivalent three-phase machine. Based on the model, its torque characteristics and operating areas are analyzed and compared to those of the conventional IPMM drives. A speed control algorithm is also developed. It includes a maximum torque per ampere control to improve drive efficiency and a flux-weakening control to maximize the feasible inverter output voltage. The proposed system and control algorithm are verified by experimental results.</P>
( Lee Kahyun ),( Choi Kee-eun ),( Choi Junho ) 디자인융복합학회 2019 디자인융복합연구 Vol.18 No.3
Previous research has shown that the use of self-disclosure, the process of revealing personal thoughts and feelings, in conversational agents (CAs) increases overall user evaluations. However, research exploring the effects of self-disclosure in different situations or dialogue types is limited. This study investigated the effects of self-disclosure and dialogue type (task- vs. social-oriented) on trust, usefulness, and usage intention. Results showed significant interaction effects between self-disclosure and dialogue type. For CAs that did not use self-disclosure, trust, usefulness, and usage intention were higher in task-oriented dialogues. In contrast, CAs that did use self-disclosure had higher trust, usefulness, and usage intention in social-oriented dialogues. These results suggest that researchers and designers should consider the specific dialogue types and corresponding user goals when adding human qualities, such as self-disclosure, to CAs.
Kahyun Lee,Yongsu Han,Jung-Ik Ha IEEE 2015 IEEE transactions on energy conversion Vol.30 No.2
<P>This paper proposes a single-phase grid-connected wound rotor machine that has the single-phase stator and three-phase rotor windings. The machine has no auxiliary winding or capacitor unlike conventional single-phase machines. Nevertheless, it can operate in all four quadrants of the torque-speed plane with a three-phase inverter. For adjustable speed drives, an isolated three-phase inverter is applied to the rotor windings while the stator winding is directly connected to a single-phase source. The grid filter and rectifier of the conventional system are eliminated and the rotor-side slip rings can be also removed by the inverter integration. So the overall structure of the proposed drive system is simple and cost effective. In this paper, the proposed machine is modeled into a modified d-q model considering the absence of q-axis stator coil. Its characteristics are analyzed and vector control methods of the grid power factor, dc-link voltage, and speed are proposed. For more efficient control, the optimal rotor current set is calculated from the minimum copper loss condition. The system has wider operating areas than other single-phase drive systems. The feasibility of the proposed system is verified by experiments.</P>
여성과 천황제 - 미시마 유키오(三島由紀夫) 문학의 여성상을 중심으로 -
이가현 ( Lee KaHyun ) 성신여자대학교 인문과학연구소 2021 人文科學硏究 Vol.44 No.-
1959년의 황태자의 결혼은 대중 천황의 이미지를 구축하는 획기적인 사건이었다. 그 화려한 결혼식 상황은 급속하게 보급된 텔레비전 전파를 타고 전국의 국민에게 전달되었고, 평민 출신이라는 점과 연애 결혼이라는 점은 황태자비 미치코에게 시선을 집중시켰다. 이후 황태자 일가의 동향은 여성 주간지의 붐을 타고 오히려 붐을 주도해가며 국민들에게 세세히 보도되었다. 이와 같은 현상은 과거 제국주의 시절에는 상상할 수 없었던 친근한 천황가의 이미지를 만들어갔는데, 일반 국민에게 다가가는 대중 천황의 이미지를 굳건하게 하는 작용을 했다. 이는 대중의 동경과 환호 속에서 ‘통치’는 하지 않지만 ‘군림’한다는 대중사회상황에 적합한 천황제인 것이다. 미시마는 이러한 대중 천황의 이미지에 대해 “눈에 보이는 천황상이 너무나도 주간지에 오염되어 있고, 매스컴에 오염되어 있다”고 부정적으로 평가했지만, 이러한 천황의 모습을 여성의 모습을 통해 그리고 있다. 미시마가 그리는 여성들은 전후 일본의 ‘근대가족’ 형태와 깊은 관계가 있는데, 그가 창작활동을 전개했던 시기에 근대가족 모델이 형성, 정착되었기 때문이다. 이러한 배경으로 본 논문에서는 여성과 천황제의 관계를 미시마 유키오 문학을 중심으로 고찰하고자 한다. 천황 권위의 회복을 주장하며 충격적인 할복자살을 한 미시마가 한편으로는, 봉건적 이에(家)제도에 반하는 여성을 그리고 있는 점을 살펴보는 과정을 통해, 천황제를 뿌리로 하는 가부장제와 여성의 관계를 파악하고 그의 작품 속에서 여성으로 대변되는 상징 천황의 모습을 살펴보는 것이 궁극적인 목적이라 하겠다. The crown prince's marriage in 1959 was an epoch-making event that established the image of the popular emperor. The spectacular wedding was broadcast nationwide on television, and Michiko, the princess, was drew attention to her for her commoner background and love marriage. Since then, the trend of the crown prince's family has been reported in detail to the public as it has led the boom in women's weekly magazines. This phenomenon has created an image of the Emperor's family, which was unimaginable in the era of imperialism, but has strengthened the image of the Emperor, who is approaching the general public. This is an emperor’s system suitable for popular social situations in which “dominant” but not “ruling” amid the admiration and cheers of the public. Regarding the image of the emperor, Mishima negatively assessed, “too contaminated by the newspapers and weekly magazines," but depicts the image of the emperor through women. The women depicted by Mishima are deeply related to the shape of Japan's “modern family” after the war, because modern family models were formed and established during his creative activities. Based on this background, this paper focuses on the relationship between women and the emperor system. The ultimate goal is to find out the relationship between patriarchy and women based on the imperial system and to find out the symbolic emperor represented by women in his work.