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차량용 BLAC 모터의 스테이터 코어 재질별 영향도에 관한연구
이주헌(Juhun Lee),이상목(Sangmok Lee),이창훈(Changhoon Lee),김찬호(Chanho Kim),신헌철(Huncheol Shin) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11
In this paper, by reviewing the characteristics of stator core materials that directly affect the electrical and mechanical effects of BLAC motors for 8P/12S cores. The actual performance of the motor and the resultant value of the cogging torque by the iron loss and coercive force of the electric steel will be checked. The low magnetic permeability and low magnetizing force in the region of high magnetic flux density(B) result in a decrease in cogging torque due to the magnetic properties of the stator. Depending on the grade of the stator core, it affects motor performance and efficiency. In order to verify this, the actual motor was assembled and evaluated.
Incidence rate of progression for borderline ovarian tumor
( Juhun Lee ),( Jong Mi Kim ),( Yoon Hee Lee ),( Gun Oh Chong ),( Dae Gy Hong ) 대한산부인과학회 2022 대한산부인과학회 학술대회 Vol.108 No.-
Objective: To evaluate incidence rate of disease progression for borderline ovarian tumor, after primary surgical treatment. Methods: Totally 177 patients were reviewed. They were diagnosed with borderline ovarian tumor on surgical biopsy from January 2011 to April 2022. They underwent surgical resection of lesions as the primary treatment. Salpingo-oophorectomy was performed for the adnexa showing lesion, and hysterectomy with contralateral adnesectomy was also performed for patients who did not want to preserve fertility. Most had been observed without particular adjuvant medication. They had been evaluated for disease progression with abdomen CT per 3 to 6 months. The disease progression group included metastasis or recurrence or development from residual ovary within follow-up period. Results: The metastasis or recurrence or development from residual ovary of disease was found in 11 of 177 (6.2%). Among those 1 (9.1%) underwent adjuvant chemotherapy with carboplatin by 4 cycles. The mean age (range) was 42.55 years (20-72). The mean progression-free survival was 18.45 months (3-57). In histologic subtype mucinous borderline tumor was 5 (45.5%), serous was 4 (36.4%) and seromucinous was 2 (18.2%). The mean size of lesion was 15.4 cm (6.4-27) on preoperative CT or MRI. For preoperative serum tumor markers the mean CA125 was 218.7 U/mL (5.7-785.6) and the mean CA19-9 was 1011.63 U/mL (2.31-7000.00). In the permanent biopsy report capsular invasion of tumor was found in 2 (18.2%), stromal microinvasion was 3 (27.3%) and intraepithelial carcinoma was 2 (18.2%). 3 (27.3%) were found to have lesions in other areas such as peritoneum, pelvic lymph node, aortocaval lymph node at each. For ascites or washing cytology, the result of atypical cells was found in 1 (9.1%). Conclusion: Gynecological oncologists need to explain the probability of progression or recurrence or development from residual ovary to patients with borderline ovarian tumor and the incidence rate was 6.2% in our institution for the last decade.
Juhun Lee,Jong Mi Kim,Gun Oh Chong,Dae Gy Hong,Yoon Hee Lee 영남대학교 의과대학 2023 Yeungnam University Journal of Medicine Vol.40 No.-
Background: Over the last two decades, serum levels of anti-Müllerian hormone (AMH) have been shown to be reliable markers of ovarian reserve. This study aimed to compare baseline serum AMH levels and well-controlled clinical factors between patients with unilateral and bilateral ovarian endometriomas during the menstrual phase. Methods: We conducted a retrospective study. We enrolled 136 patients aged 18 to 36 years who were diagnosed with unilateral or bilateral ovarian endometriomas. Serum AMH levels of all patients and their latest two to three menstrual cycles were measured before surgery for ovarian endometriomas. The latest menstrual cycle length ranged from 26 to 30 days. Patients with irregular menstruation, a recent medication history of hormonal drugs other than oral contraceptive pills, a previous history of ovarian surgery, or any medical history influencing ovarian function were excluded. Results: Of the 136 patients, 76 (55.9%) had unilateral ovarian endometriomas and 60 (44.1%) had bilateral ovarian endometriomas. Serum AMH levels were not significantly different between the two groups in the follicular phase, luteal phase, or at any random time point. Conclusion: Serum AMH levels were not significantly different between unilateral and bilateral ovarian endometriomas in the follicular and luteal phases, or at any random time during the menstrual cycle when various confounding factors were excluded.
CMOS 아날로그 전류모드 곱셈기의 선형성과 동적범위 향상을 위한 회로설계 기법에 관한 연구
Daniel Juhun Lee,김형민(Hyung-Min Kim),박소연(So-Youn Park),노태민(Tae-Min Nho),김성권(Seong-Kweon Kim) 한국전자통신학회 2020 한국전자통신학회 논문지 Vol.15 No.3
이 논문에서는 아날로그 전류모드 인공지능 프로세서에서 핵심 디바이스 중에 하나인 아날로그 전류 모드곱셈기 회로의 선형성과 동적범위 향상을 위한 설계 기법을 소개한다. 제안하는 회로는 4 quadrant Translinear loop를 NMOS 트랜지스터만으로 구성하여, 트랜지스터의 물리적 Mismatch를 최소화하는 설계로 0.35𝜇𝑚 CMOS 공정에서 117𝜇𝑚 x 109𝜇𝑚로 구현가능하였으며, 최대 전고조파왜율 0.3% 의 선형성을 확보할 수 있었다. 제안한 아날로그 전류모드 곱셈기는 전류모드 인공지능 프로세서의 핵심 회로로 유용할 것으로 기대된다. In this paper, we present a design method for improving the linearity and dynamic range of the analog current mode multiplier circuit, which is one of the key devices in an analog current mode AI processor. The proposed circuit consists of 4 quadrant translinear loops made up of NMOS transistors only, which minimizes physical mismatches of the transistors. The proposed circuit can be implemented at 117𝜇𝑚 x 109𝜇𝑚 in 0.35𝜇𝑚 CMOS process and has a total harmonic distortion of 0.3%. The proposed analog current mode multiplier is expected to be useful as the core circuit of a current mode AI processor.
이병화(Byounghwa Lee),송주헌(Juhun Song),이천성(Cheonsung Lee),장영준(Youngjune Chang),전충환(Chunghwan Jeon) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
This study is to investigate the effect of the moisture, volatile matter and size in the coal on the pulverized coal combustion characteristics by means of a three-dimensional numerical simulation method. The results show that combustion temperature in the boiler utilizing sub-bituminous coal is entirely getting lower as the moisture content increases. When sub-bituminous coal is utilized in order to get equivalent output power in the boiler which was designed for bituminous coal, it should be considered not only heating value but cooling effect driven from increasing air and coal. The more volatile matter content in a coal is, the more combustion occurs quickly and rapidly near burner. Therefore, as the temperature near region of burner becomes high, the burner is expected to be damaged. Also, mean temperature at the elevation burner located is higher than those of other elevation, because of characteristics of volatile matter. On the other hand, temperature in the part of super-heater where is rear region of boiler is lower, for the combustion time of particle is very short. However, as the particle size increases, the temperature rear region of boiler show tendency to return back to conditions where temperature is similar to bituminous coal condition, for combustion burning time of coal can be keep longer. This implies that in order to apply sub-bituminous coal into the boiler designed for bituminous coal, enlarging pulverized coal particle size could be an alternative to maintain appropriate temperature in the rear region of the boiler.
미분탄 연소로에서 연소특성에 미치는 석탄특성에 관한 연구
이병화(Byounghwa Lee),송주헌(Juhun Song),이천성(Cheonsung Lee),장영준(Youngjune Chang),전충환(Chunghwan Jeon) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.10
This study is to investigate the effect of the moisture, volatile matter and particle size in the coal on the pulverized coal combustion characteristics using CFD. The results show that as the moisture content in coal increases, flame temperature decreases because of heat loss driven from latent heat of vaporization and reduction of heating value. As the volatile matter content in the coal increases, the temperature in the region near the burner increases, while the temperature in rear region of boiler decreases. The solution to keep the temperature in the rear region of boiler is suggested that particle size is needed to be larger. As the particle size increases, the temperature in the rear region of boiler show tendency to increase, for combustion burning time of coal could be extended.