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권혁운,최서익,김철우 부산대학교 생산기술연구소 2001 生産技術硏究所論文集 Vol.60 No.-
본 논문은 SRM의 회전자 위치 정보를 얻는 새로운 방법을 제시하였다. 회전자의 위치에 따라 인덕턴스가 변화함을 이용하며 비여자상의 펄스 전류, 펄스 전압를 측정하고 인덕턴스를 측정하여 위치를 예측한다. Micro-processor는 비여자상을 결정하고 테스트 결과는 SRM의 센스리스 제어가 가능함을 보여주고 있다. This paper describes a new methods of detecting rotor position in SRM (switched reluctance motor). A low-cost position-sensing scheme using stator inductance measurement is presented in this paper. An analog electronic technique can be applied to measure the inductance of a nonconducting phase by measuring phase current and pulse voltage. Micro-processor is decided to the nonconducting phase. Test results show that this technique is a possible approach to detect the rotor position of an SRM.
박사영,이나영,이효진,이선영,최진혁,이순남,심강섭,성순희,한운섭 梨花女子大學校 醫科大學 醫科學硏究所 1996 EMJ (Ewha medical journal) Vol.19 No.3
Multiple primary cancer means that more that two cancers occur independently in an individual. Recently, the incidence of multiple primary cancer has increased with lengthened survival, of cancer patients, development of new diagnostic technique and increased clinical evaluation. We report a patient who had adenocarcinoma of stomach combined with squamous cell carcinoma of esophagus simultaneously.
The Potency of Abamectin Formulations against the Pine Wood Nematode, Bursaphelenchus xylophilus
Jong-won Lee(Jong-won Lee),Abraham Okki Mwamula(Abraham Okki Mwamula ),Jae-hyuk Choi(Jae-hyuk Choi),Ho-wook Lee(Ho-wook Lee),Yi Seul Kim(Yi Seul Kim),Jin-Hyo Kim(Jin-Hyo Kim),Dong Woon Lee(Dong Woon L 한국식물병리학회 2023 Plant Pathology Journal Vol.39 No.3
Abamectin offers great protection against Bursaphelenchus xylophilus, a well-known devastating pathogen of pine tree stands. Trunk injection of nematicides is currently the most preferred method of control. This study aimed to evaluate the potency of the commonly used formulations of abamectin against B. xylophilus. Twenty-one formulations of abamectin were evaluated by comparing their sublethal toxicities and reproduction inhibition potentials against B. xylophilus. Nematodes were treated with diluted formulation concentrations in multi-well culture plates. And, populations pre-exposed to pre-determined concentrations of the formulations were inoculated onto Botrytis cinerea culture, and in pine twig cuttings. Potency was contrastingly different among formulations, with LC95 of 0.00285 and 0.39462 mg/ml for the most, and the least potent formulation, respectively. Paralysis generally occurred at an application dose of 0.06 μg/ ml or higher, and formulations with high sublethal toxicities caused significant paralysis levels at the tested doses, albeit the variations. Nematode reproduction was evident at lower doses of 0.00053-0.0006 μg/ml both on Botrytis cinerea and pine twigs, with significant variations among formulations. Thus, the study highlighted the inconsistencies in the potency of similar product formulations with the same active ingredient concentration against the target organism, and the need to analyze the potential antagonistic effects of the addi-tives used in formulations.
A Switched VCO-based CMOS UWB Transmitter for 3-5 ㎓ Radar and Communication Systems
Woon-Sung Choi,Myung-Chul Park,Hyuk-Jun Oh,Yun-Seong Eo 대한전자공학회 2017 Journal of semiconductor technology and science Vol.17 No.3
A switched VCO-based UWB transmitter for 3-5 ㎓ is implemented using 0.18 ㎛ CMOS technology. Using RF switch and timing control of DPGs, the uniform RF power and low power consumption are possible regardless of carrier frequency. And gate control of RF switch enables the undesired side lobe rejection sufficiently. The measured pulse width is tunable from 0.5 to 2 ns. The measured energy efficiency per pulse is 4.08% and the power consumption is 0.6 ㎽ at 10 Mbps without the buffer amplifier.
A Switched VCO-based CMOS UWB Transmitter for 3-5 GHz Radar and Communication Systems
Choi, Woon-Sung,Park, Myung-Chul,Oh, Hyuk-Jun,Eo, Yun-Seong The Institute of Electronics and Information Engin 2017 Journal of semiconductor technology and science Vol.17 No.3
A switched VCO-based UWB transmitter for 3-5 GHz is implemented using $0.18{\mu}m$ CMOS technology. Using RF switch and timing control of DPGs, the uniform RF power and low power consumption are possible regardless of carrier frequency. And gate control of RF switch enables the undesired side lobe rejection sufficiently. The measured pulse width is tunable from 0.5 to 2 ns. The measured energy efficiency per pulse is 4.08% and the power consumption is 0.6 mW at 10 Mbps without the buffer amplifier.
최필조,한상국,신동혁,권운용,송형곤,송근정,정연권 대한응급의학회 2002 대한응급의학회지 Vol.13 No.4
Purpose: In old age, abdominal aortic aneurysm (AAA) is not a rare disease and potentially fatal. Also, there has been a lack of concern for this disease in the emergency department. Our study investigated the clinical characteristics of AAAs seen in the emergency center to assess the needs of the diagnostic approach to this disease in the emergency center. Methods: Eighty patients with an AAA between Jan. 1995 and Jul. 2002 were enrolled. Data were obtained from a retrospective review of medical records. We analyzed the clinical characteristics of the AAA on the basis of the patient's age and sex, risk factors, presenting symptoms and signs, physical findings, diagnostic tools, and findings. Results: AAAs were predominant in males (82.5%). A smoking history (57.5%), old age over 65 (71.3%) and hypertension (50.0%) were the most common risk factors. In this study, the initial diagnosis of a AAA was mostly determined by the existence of a pulsating abdominal mass, and the overall sensitivity of a pulsating abdominal mass was 57.5%. Although the most common presenting symptom was abdominal pain(51.3%), about one third of the patients had no subjective symptoms. Twenty-one of the patients had a ruptured AAA at the time of diagnosis. There was no remarkable difference in the incidence of large AAA (>5 ㎝) or ruptured AAA between elderly (>65 years) and the young (<65 years). Conclusion: Because of the absence or vagueness of symptoms and signs, an AAA might be initially excluded without a careful examination. For the early detection and prevention of a ruptured AAA, emergency medical doctors should carefully evaluate and assess patients with risk factors even though they have non-specific symptoms of the gastrointestinal or urinary system.
Low-grade Mucinous Cystic Tumor Associated with Endo-metriosis in the Cecum
Dae-Woon Eom(엄대운),Gil Hyun Kang(강길현),Sang Wook Yi(이상욱),Seung Mun Jung(정승문),Jin Ho Kwak(곽진호),Hyuk Jai Jang(장혁재),Kun Moo Choi(최건무),Myung Shick Han(한명식) 대한외과학회 2007 Annals of Surgical Treatment and Research(ASRT) Vol.73 No.1
We report here on an unusual case of mucinous cystic tumor that was associated with endometriosis in the cecum. A 45-year-old woman was admitted to the hospital due to her 5 day history of right lower quadrant abdominal pain with a mild fever. A laparotomy was performed under the clinical impression of the tubo-ovarian abscess. A relatively well defined a multi-locular cystic mass (8.0×8.0×7.0 cm) filled with white-to-yellow thick mucoid material was found in the wall of the cecum. The right ovary and fallopian tube showed marked fibrous adhesion to the external surface of the cecal mass. A right hemicolectomy and salpingo-oophorectomy were performed. Histologically, the tumor was similar to those of ovarian borderline mucinous tumor, the intestinal type, and the mucinous epithelium of the tumor was merged with the endometriotic epithelium and stroma. On immunostaining, the CK20 positive mucinous epithelium was well demarcated from the CK7 endometriotic epithelium. This is the first case of low-grade mucinous cystic tumor intimately associated with intestinal endometriosis in the cecum.