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가청주파수 경계대역에서 저가의 통신채널을 제공하는 초음파 모뎀 구현
전성배,이동원,정해,Jeon, Seong-Bae,Lee, Dong-Won,Chung, Hae 한국정보통신학회 2010 한국정보통신학회논문지 Vol.14 No.6
최근 출시되고 있는 PAN 용 통신부품으로 Bluetooth와 Zigbee가 선호되고 있으나 가전제품을 비롯하여 오디오기기, 휴대폰, PC 등에서 비교적 저속으로 단순한 메시지를 전달하는데 있어서 이러한 통신부품을 장착하기에는 다소 부담스럽고 제품이 복잡해진다. 본 논문에서는 제품에 이미 장착되어 있는 스피커와 마이크를 이용하여 가청한계 대역에서 초음파를 이용한 무선 통신 방법을 제안한다. 오디오 신호에 영향을 주지 않고 데이터 전송을 가능하게 하기 위하여 가청 한계 대역에서 ASK와 FSK 송수신 방식을 제시하고, 초음파 통신 모뎀을 설계 및 구현한다. 구현된 통신 모뎀은 배경 잡음이 있는 환경에서 실험을 통해 제안한 초음파 통신 모뎀의 성능을 검증한다. Recently, communication components prefer Bluetooth or Zigbee for PAN. However, using these makes expensive and complicated products such as audio equipments, mobile phones, PC, etc. for transmitting simple messages with low rate. In this paper, we propose wireless communication method using ultrasonic in the audio frequency limit band with speakers and microphones which are in products. We suggest transmitting and receiving methods in the audio frequency limit band for transmitting data without affecting audio signal, and implement an ultrasonic communication modem. Finally, we verify the performance of the ultrasonic communication modem by experiments in an environment with background noise.
EV 구동용 IPMSM의 도체 개수에 따른 교류 동손 특성 비교 분석
전성배,김대우,김진석,고영윤,김용재,정상용 한국정보통신설비학회 2019 정보통신설비학회논문지 Vol.15 No.3
In this paper, the research on the AC copper loss of Interior Permanent Magnet Synchronous Motor(IPMSM) for Electric Vehicle(EV) is carried out according to the number of conductors. For this research, the analysis method of AC copper loss is introduced, and the loss characteristics are analyzed by classifying the components of AC copper loss according to the number of conductors. The analysis is carried out from the low speed to high speed region(5,000rpm, 7,500rpm, 10,000rpm). The analysis model is EV traction IPMSM of 8 poles 72 slots. To verify reliability of the analysis, 2D-Finite Elements Analysis(2D-FEA) software tool is employed.
Two-Step Incision for Periarterial Sympathectomy of the Hand
전성배,안희창,안용수,최승석 대한성형외과학회 2015 Archives of Plastic Surgery Vol.42 No.6
Background Surgical scars on the palmar surface of the hand may lead to functional and also aesthetic and psychological consequences. The objective of this study was to introduce a new incision technique for periarterial sympathectomy of the hand and to compare the results of the new two-step incision technique with those of a Koman incision by using an objective questionnaire. Methods A total of 40 patients (17 men and 23 women) with intractable Raynaud’s disease or syndrome underwent surgery in our hospital, conducted by a single surgeon, between January 2008 and January 2013. Patients who had undergone extended sympathectomy or vessel graft were excluded. Clinical evaluation of postoperative scars was performed in both groups one year after surgery using the patient and observer scar assessment scale (POSAS) and the Wake Forest University rating scale. Results The total patient score was 8.59 (range, 6–15) in the two-step incision group and 9.62 (range, 7–18) in the Koman incision group. A significant difference was found between the groups in the total PS score (P-value=0.034) but not in the total observer score. Our analysis found no significant difference in preoperative and postoperative Wake Forest University rating scale scores between the two-step and Koman incision groups. The time required for recovery prior to returning to work after surgery was shorter in the two-step incision group, with a mean of 29.48 days in the two-step incision group and 34.15 days in the Koman incision group (P=0.03). Conclusions Compared to the Koman incision, the new two-step incision technique provides better aesthetic results, similar symptom improvement, and a reduction in the recovery time required before returning to work. Furthermore, this incision allows the surgeon to access a wide surgical field and a sufficient exposure of anatomical structures.
청상사화탕(淸上瀉火湯)이 토끼의 수축혈관에 미치는 영향
전성배,김이화,남창규,Jeon, Sung-Bai,Kim, Ee-Hwa,Nam, Chang-Gyu 대한약침학회 2003 Journal of pharmacopuncture Vol.6 No.3
This study was undertaken to define the effect of ChungSangSaWhaTang on the norepinephrine-induced arterial contraction and the mechanism of ChungSangSaWhaTang-induced relaxation. In order to investigate the effect of ChungSangSaWhaTang on contracted rabbit carotid arterial strips, transverse strips with intact or damaged endothelium were used for the experiment using organ bath. To analyze the mechanism of ChungSangSaWhaTang-induced relaxation, ChungSangSaWhaTang extract infused into contracted arterial strips induced by norepinephrine after treatment of indomethacin, $N_{\omega}$-nitro-L-arginine, or tetraethylammonium chloride. ChungSangSaWhaTang relax arterial strip with endothelium contracted by norepinephrine, but in the strips without endothelium, ChungSangSaWhaTang-induced relaxation was significantly inhibited. The endothelium-dependent relaxation induced by ChungSangSaWhaTang was decreased by the pretreatment of $N_{\omega}$-nitro-L-arginine, but it was not observed in the strips pretreated with indomethacin or tetraethylammonium chloride. We suggest that ChungSangSaWhaTang may inhibit agonist-induced contraction through the formation of nitric oxide in the vascular endothelial cells.