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이선표(Sun Pyo Lee) Korean Society for Precision Engineering 2006 한국정밀공학회지 Vol.23 No.11
In this paper error-compensating techniques in three-point weighing method to precisely measure unbalance properties such as center of gravity and unbalance moment. In the conventional static methods, 1) fixture-errors, 2) effects of the contact between the fixture and the load scales, and 3) side effect due to the lateral frictional forces acting on the contact points between the fixture and the load scales are the major factors that lead to measurement errors. The proposed error-compensating method perfectly eliminates both the fixture-error and the contact-error simultaneously by manipulating the three measured reaction forces at three different angular locations. Also the friction-error is calibrated by comparing the sum of three reactions with the actual mass of the specimen. A set of measurement is performed using the same measuring system as Lee's, and a comparison of the results from the convectional, Lee's, and the proposed method is provided. The results show that the proposed method effectively compensates the errors listed above.
이선표(Sun Pyo Lee) Korean Society for Precision Engineering 2006 한국정밀공학회지 Vol.23 No.6
Gravitational centers of precise spinning components must coincide with the rotational centers of those to reduce noise and vibration and to extend those life as well. Therefore quality control should be performed in the manufacturing process, in which the unbalance moments are accurately measured. In this paper 3-point weighing method is adopted to measure the unbalance moment of small-sized precision spinning elements using electronic scales with 0.1 ㎎ resolution. Firstly methods to eliminate the fixture error and to reduce the effects of frictional force that is known as side effect, are proposed. A measuring system is developed and various experiments are performed to verify the proposed approach. The measured and calculated values are analysed in statistical methods, and this provides the errors of the measuring system. The results show that the proposed theory and test procedures gives reliable unbalance moments and gravitational centers.
증례 : 혈액종양 ; 헬리코박터 제균 치료 후 완전 관해된 방광의 원발성 점막연관 림프조직 림프종 1예
이선표 ( Sun Pyo Lee ),주명수 ( Myung Soo Choo ),류민희 ( Min Hee Ryu ),송민정 ( Min Jeong Song ),서세영 ( Se Young Seo ),정유문 ( Yu Mun Jeong ),서명숙 ( Myeong Sook Seo ),허주영 ( Joo Ryung Huh ) 대한내과학회 2014 대한내과학회지 Vol.87 No.2
방광에서 발생한 원발성 MALT 림프종은 드문 질환으로 만성 방광염과 유사한 임상 증상을 갖고 국내에서 지금까지 보고된 사례는 1예뿐이다. 저자들은 혈뇨를 주소로 내원한 중년 여성에서 만성 방광염에서 병발한 MALT 림프종을 진단하고 방사선 치료나 항암화학요법이 아닌 항생제 투여를 통해 완치하였기에 문헌고찰과 함께 보고하는 바이다. Primary lymphoma of the urinary bladder is rare, comprising 0.2% of extranodal lymphomas. The predominant subtype of mucosa-associated lymphoid tissue (MALT) is extranodal marginal zone lymphoma. We report a case of MALT lymphoma of the urinary bladder in a 53-year-old female patient presenting with a five-year history of persistent hematuria and urinary frequency. A cystoscopy revealed multiple nodular lesions at the posterior wall and trigone of the bladder. The tissue obtained by cold-cup biopsy revealed lymphoid infiltration consistent with low-grade MALT lymphoma. Image studies revealed that the tumor originated from the urinary bladder and there was no evidence of metastases. The patient was positive for a rapid urease test. Because of the relationship between gastric MALT lymphoma and Helicobacter pylori, the patient was treated with antibiotics to eradicate Helicobacter pylori. The lymphoma subsequently disappeared and the patient has remained in persistent complete remission for eight years. (Korean J Med 2014;87:229-233)
Poor vein 환자의 Cardiac CTA 검사 시 조영제 주입방법에 관한 연구
이선표(Sun Pyo Lee),최재성(Jae Seong Choi),범희남(Hee Nam Bum),전주섭(Joo Seob Jeon),최남길(Nam Gil Choi) 대한CT영상기술학회 2015 대한CT영상기술학회지 Vol.17 No.1
목적 : Poor vein 환자의 Cardiac CTA검사 시 일반적인 편측 조영제 주입과 비교하여 Reverse Y connector를 이용한 양측 조영제 주입 시 유용성에 대하여 평가하고자 하였다. 대상 및 방법 : 2012년 2월부터 2014년 8월 까지 Cardiac CTA로 추적 관찰하는 환자들 중 Poor vein 환자 17명(남자:5명, 여자:12명, 평균64세)을 대상으로 하였다. 17명의 환자는 과거 검사 시 좋지 않았던 혈관으로 인해 Cardiac CTA검사에 필요한 적정 조영제 주입속도보다 낮은 flow rate의 속도로 조영제를 주입해야만 했던 환자들이었으며 조영제 주입 시 부작용(혈관통: 4명, 혈관외유출: 1명)을 경험했던 환자도 포함되어 있었다. 검사방법은 양측 상지에 24G catheter로 IV route를 확보 후 Reverse Y connector를 연결하고 조영제 자동주입기를 통해 4~4.5 mL/sec 의 속도로 조영제를 주입하여 영상을 획득하였다. 영상의 분석방법으로는 양측 주입영상과 과거 편측 주입영상의 Ascending aorta와 RCA, LM 에 관심부위(ROI)를 설정하여 HU(hounsfield unit)값을 측정하여 조영증강정도를 비교하였으며 영상의 화질 평가는 재구성되어진 VRT영상과 Curved MPR영상을 영상의학과 의사 1명과 방사선사 2명이 Blind-test를 통해 5점 척도로 평가하였다. 결과 : 양측주입영상과 편측주입 영상의 조영증강정도는 Ascending aorta에서 418.82 ± 36.99, 391.05 ± 56, RCA에서 419.82 ± 35.83, 389.2 3± 51.67, LM에서 422.41 ± 38.94, 392.70 ± 53.74로 양측 주입을 통해 획득되어진 영상의 HU값이 평균 14% 높게 나왔으며 통계적으로 유의한 차이를 보였다. 재구성 영상의 화질 평가점수는 양측 주입 시 4.21 ± 0.42점, 편측 주입 시 3.8 4± 0.52점으로 양측주입을 통해 획득한 영상의 점수에서 높게 나타났으며 통계적으로 유의한 차이를 보였다. 결론 : Poor vein 환자의 cardiac 검사 시 Reverse Y connector를 이용하여 양측 상지에 조영제를 주입한 결과 편측주입에 비해 심장혈관 내에서의 조영증강 효과와 재구성 영상의 질 향상, 혈관통의 감소, 그리고 혈관외유출 등 부작용을 감소시킴으로서 검사에 대한 만족도 향상 등 장점들이 많아 임상적용을 적극 권장하는 바이다. Purpose : This study evaluated on the usefulness of both sides injection using Reverse Y connector compared to ordinary one side contrast media injection for poor vein patient in Cardiac CTA. Materials and method : The study included 18 patients (5male, 12females, mean age 64) who had poor vein through Cardiac CTA in between February, 2012 to August, 2014. Examining process went as the following, we obtained a image from automatic contrast media injection at a speed of 4~4.5 mL/sec after gaining IV route through 24G catheter in both of arms. A comparison of the image qualities and degree of vascular contrast enhancement was made between the two groups and evaluated statistically by SPSS program. Result : By using reverse Y connector, we obtained a image and the initial image and obtained result was Ascending aorta and RCA and LM’s contrast enhancement level was shown as 418.82 ± 36.99~391.05 ± 56, 419.82 ± 35.83~389.23 ± 51.67, 422.41 ± 38.94~392.70 ± 53.74, which are higher HU value than others and shown difference in between statistically. Also the qualification score for two examination will be 4.21 ± 0.42 and 3.84 ± 0.52, so therefore the image of both injection tells an outstanding difference. Conclusion : Reverse Y connector is used to test out contrast media by IV line and when it was done, it brought higher quality for evaluating the increasing level and higher quality than previous injection exam. The contrast media injection through both veins divides the pressure that gets into one vein to both veins, so angiodynia, extravasation problems could be minimized and the increasing attenuation value has been shown that Cardiac CTA Reverse Y connector usage can be very useful.
이동창(Dong Chang Yi),이선표(Sun Pyo Lee),이명훈(Myoung Hoon Lee),이의학(Euhark Lee) Korean Society for Precision Engineering 2006 한국정밀공학회지 Vol.23 No.8
In this paper, a uniform speed controller for an ultrasonic rotary motor is developed using the phase-difference method. The phase difference method uses traveling waves to drive the ultrasonic motor. The traveling waves are obtained by adding two standing waves that have a different phase to each other. A compact phase-difference driver system is designed and integrated by combining VCO(Voltage Controlled Oscillator) and phase shifter. Theoretically the relationship between the phase difference in time and the rotational speed of the ultrasonic motor is sine function, which is verified by experiments. Then a series of experiments under various loading conditions are conducted to characterize the motor's performance that is the relationship between the speed and torque. Proportional-integral control is adopted for the uniform speed control. The proportional control unit calculates the compensating phase-difference using the rotating speed which is measured by an encoder and fed back. Integral control is used to eliminate steady-state errors. Differential control for reducing overshoot is not used since the response of ultrasonic motor is prompt due to its low inertia and friction-driving characteristics. The developed controller demonstrates reasonable performance overcoming disturbing torque and the changes in material properties due to continuous usage.