Equivalent Circuit Analysis of Induction Motors Considering Magnetic Saturation for Automotive Applications

Su‑Jin Lee,김성일,Pil‑Wan Han,김창업 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.4

This paper deals with the characteristics analysis of 3-phase induction motors for electric power steering applications by combining fnite element analysis with an equivalent circuit model. Induction motors for automobiles have high magnetic saturation due to size limitations. Accordingly, to improve the accuracy of the equivalent circuit analysis, it is necessary to consider the magnetizing reactance according to the magnetizing current. An equivalent circuit analysis method that takes into account the magnetic saturation of 3-phase induction motors is proposed and verifed through a test.

전자구개도(EPG)를 이용한 한국어 치경마찰음 /ㅅ, ㅆ/의 조음운동적 특성

김지영(Ji-Yeong Kim),우승탁(Seong-Tak Woo),김미진(Mi-Jin Kim),오다희(Da-Hee Oh),김수진(Su-Jin Kim),하지완(Ji-Wan Ha) 한국언어청각임상학회 2021 Communication Sciences and Disorders Vol.26 No.2

배경 및 목적: 본 연구는 전자구개도를 사용하여 한국어의 치경마찰음인 /ㅅ/와 /ㅆ/를 조음운동적 측면에서 비교 분석해보고, 치경마찰음 조음 시 나타나는 혀-구개 접촉에 관한 정보를 제공하기 위한 목적으로 시행되었다. 방법: 한국어가 모국어이며 발음에 문제가 없는 정상 성인 5명이 전자구개도를 착용하여 치경마찰음을 분절음 차원에서뿐 아니라 단어 내 위치 및 모음문맥을 달리하여 녹음한 후 팰라토그램을 분석하였다. 결과: 그 결과, /ㅅ/와 /ㅆ/는 협착의 너비와 혀-구개 최대접촉구간에서 유의한 차이를 보였다. /ㅆ/에서 협착의 너비가 더 좁고 전체 혀-구개 접촉구간은 더 넓게 나타났다. 단어 내 위치에 따른 차이는 유의하지 않았지만, 고모음인 /ㅣ/ 문맥에서는 저모음인 /ㅏ/에 비해 협착의 위치가 후방화되었으며, 지속시간도 가장 긴 것으로 나타났다. 또한 혀-구개 접촉 구간도 가장 넓게 나타났다. 논의 및 결론: 본 연구는 전자구개도를 사용하여 한국어 치경마찰음의 혀와 구개 접촉에 관한 정보를 제공했다는 점에서 그 의의를 갖는다. 또한 본 연구의 결과는 한국형 전자구개도의 개발의 기초자료로써 그 의미가 있다. Objectives: The present study is aimed an electropalatographic investigation of Korean fricatives /s/ and /s*/. All data from this study is based on the production of 5- adult speakers who speak Korean as their first language. Methods: Electropalatography (EPG) is an instrumental technique for showing tongue and palate contact during speech. The participants recorded /s/ and /s*/ in CV (/si/, /sɑ/, /su/, /s*i/, /s*ɑ/, /s*u/) and VCV (/ɑsi/, /ɑsɑ/, /ɑsu/, /ɑs*i/, /ɑs*ɑ/, /ɑs*u/) context using EPG and then, four variables were analyzed: row of medial groove (RMG), medial groove width (MGW), medial groove length (MGL), and maximum contact frame (MCF). Results: There was significantly greater medial groove width and maximum contact frame for / s*/ compared to /s/. The difference between /si/ and /sɑ/ was also found in the row of medial groove, medial groove width and maximum contact frame. /si/ was produced further back, and had a longer medial groove length. Also, it showed more total tongue-palate contact than /sa/. Conclusion: A various range of palatal contact patterns were found between typical adults for perceptually normal /s/ and /s*/. The results provided the information about tongue–palate pattern of Korean fricatives /s/ and /s*/. These findings would be utilized to build the basic data and useful information for Korean EPG system.

복합운동 프로그램이 비만여성의 신체조성과 식욕조절 호르몬에 미치는 영향

김수민,김병완,송영은 대전대학교 기초과학연구소 2016 自然科學 Vol.30 No.-

The purpose of this study is to identify effects of 12 weeks walking-resistance exercise and running-resistance exercise on body composition and appetite regulating hormones. Participants consist of 17 overweight women who are 40's and have higher than 30% of the percentage body fat. They are randomly divided into two groups; Walking and Resistance Group (WRG, n=9) and Running and Resistance Group (RRG, n=8). For the walking group, exercise intensity of walking is gradually increased by 50%-70% every 4 weeks. There are 4 exercise sessions a week. On the other hand, there are 4 exercise sessions provided for the running group. Each session lasts for 30 minutes. The exercise is performed with intensity of 60% HRmax, (from 1st to 4th week), 70% HRmax (from 5th to 8th week) and 75% HRmax (from 9th to 12th week). The common resistance exercises provided to both groups are Bench press, Lat pull-down, Leg extension, Triceps extension, Leg curl, Biceps curl, Calf raises and Sit-up, which are performed with 60-70% of 1RM. First, for the body composition, it is found that weight, BMI and percentage body fat of the WR group and the RR group are significantly decreased during the exercise period. Second, for appetite regulating hormones, leptin in both groups shows statistically significant decrease while ghrelin is significantly increased. According to the results of 12 weeks duration combined exercise for the Walking and Resistance Group and the Running and Resistance Group, it is shown that body composition has been positively changed and appetite regulating hormone are improved. Therefore, this study concludes that the combined exercise is effective to treatment of obesity.

척수손상 환자에서 골 대사의 생화학적 변화

김상수,서정환,김완호,김연희 大韓再活醫學會 1997 Annals of Rehabilitation Medicine Vol.21 No.6

Carbonyl 화합물에 대한 Trimethyl-Silylcyanide의 첨가 반응

한완수,박철영,이일규 中央大學校 自然科學硏究所 1988 自然科學硏究所 論文集 Vol.2 No.-

Trimethylsilylcyanide is found to be a good reagent for the formation fo trimethylsilylcyanohydrin ethers from the direct reaction with carbonyl compounds. To obtain organic cyanoderivatives, trimethylsilylcyanide was addes to vbarious carbonyl compounds (acetaldehyde, acetone, cyclohexanone, propiophenone, benzophenone) in the presence of Lewis acid catalysts at room temperature. Addition of small amounts of Lewis acid catalysts to the reactions increased the yields of trimethylsilylcyanide carbonyl addition products. The results of these reactions indicated that the yields in trimethylsilycyanide addition reaction to the highly hindered carbonyl compounds were affected by the nature of catalysts employed, and increased as below. AlCl₃>SnCl₄≫ZnCl₂

타리비드 정(오플록사신 100㎎)에 대한 파비드 정의 생물학적동등성

박완수,조성희,이헌우,임호택,홍성제,서성훈,류재환,이경태 한국약제학회 2005 Journal of Pharmaceutical Investigation Vol.35 No.1

The purpose of the present study was designed to evaluate the bioequivalence of two ofloxacin tablets, Tarivid (Jell Pharm. Co., Ltd.) and Favid (ILHWA Co., Ltd.), according to the guidelines of Korea Food and Drug Administration (KFDA). Twenty-four normal male volunteers, 23.67±3.12 year in age and 68.50±7.23 kg in body weight, were divided into two groups and a randomized 2x2 cross-over study was employed. After four tablets containing 100 mg of ofloxacin were orally administered, blood was taken at predetermined time intervals and concentrations of ofloxacin in plasma were deter mined using HPLC. Pharmacokinetic parameters such as AUC_(t) and T_(max) were calculated and ANOVA test was utilized for the statistical analysis of the parameters using logarithmically transformed AUC_(t), and C_(max) and untransformed T_(max). There were no sequence effects between two formulations in these parameters. The 90% confidence intervals for the log transformed data were acceptance range of log 0.8 to log 1.25 (e.g., log 0.94-log 1.04 and log 0.90-log 1.07 for AUC_(t) and C_(max) respectively). The major parameters. AUC_(t) and C_(max) met the criteria of KDFA for bioequivalence indicating that Favid tablet is bioequivalent to Tarivid tablet.

야구경기 볼카운트에 따른 안타발생빈도에 관한 연구

이용완,오수일 江原大學校附設體育科學硏究所 1994 江原大學校附設體育科學硏究所論文集 Vol.- No.18

This study was tried to be analyzed in the object of ninety five games, ninety eight schools had joined in three competitions in order to find out hits-made-percentage according to ball count in these high school baseball games. The conclusions to this analysis were as follows. 1. Hits-made-ratio (HMR) according to the ball count. HMR was the highest when the ball count was no ball, no strike (0-0) and as a whole hits were made within the third ball. But batting average was over 30% when ball count was advantageous for hitters. Each team in each game produced 7.99 hits on the average and hit more than one when ball count was no ball, no strike (0-0) and one ball, one strike (1-1). Thes was almost the same as HMR. Superior schools in the competitions were higher than non-superior schools in HMR and Batting Average. 2. HMR according to the base-runner or no base-runner HMR was high in case runner was on no base, but BA was high when runner was no bases. These were almost same between superior them and non-superior team, but superior teams were high in batting ability irrespective of runner. 3. HMR according to the ball count when there is base runner or not. HMR and BA was high irrespective of runner in third ball of pitcher. In HMR there is little difference batween superior team and non-superior team, but in BA superior team was high under the various ball counts. 4. HMR according to the pitched number. HMR according to the pitched number was produced within the third ball of pitcher. 5. HMR according to ball count was high in the first ball of pitcher. Especially when ball count was advantageous for hitter, percentage of slugging very frequent. This tells that slugging gives a great influence on winning the game. 6. Bases on balls, hit by pitched ball, sacrifice hits, batting obstruction, errors and strikeouts according to the ball count. Bases on balls was so high in 3-2 that hitters was patient, and hit by pitched ball, sacifice hits ans errors happened so often in 0-0 that discomfort of pitcher, bunt and discomfort of defence could be showed, in the first pitching. Stride-outs after two strikes is the reason why hitters was not flexible to the various changed balls.

巴豆가 흰쥐 흉부대동맥 혈관수축에 미치는 영향

朴完洙,金亨煥,安德均,崔湖榮 대한본초학회 2002 大韓本草學會誌 Vol.17 No.2

Objectives : We have examined the vasoconstriction response to the various extracts of Crotonis Fructus (CF, Seed of Croton tiglium L.), defatted CF (DCF), roasted CF (RCF), and Croton oil in rat isolated thoracic aorta. Methods : We have examined the thoracic aorta segments obtained from rats immediately after delivery were mounted in organ baths superfused on a polygraph. Results : We found that the thoracic aorta segments responded to various extracts of CF with a dose-dependent vasoconstriction. In comparison to the 100 mM KCl induced contraction, it was contracted by 150% (water extract of CF), 144.5% (70% ethanol extract of CF), 80.1% (water extract of DCF) and 96.6% (ethanol extract of DCF) after addition of the 3 mg/ml each extract. The thoracic aorta segments were contracted by 118.5% (0.01 mg/ml Croton oil), 133.8% (3 mg/ml RCF for 10min), 123.1% (20min), 117.8% (30min), and 103.9% (40min). Conclusions : In the conclusion, CF, DCF, and RCF induced dose-dependent contraction in the isolated rat thoracic aorta. And it's major component, Croton oil, has potent vasoconstriction effect.

국내 혈액질환 환자에서 침습성 진균 감염의 구제치료로서 Caspofungin의 효과와 안전성

최수미,박선희,이동건,최정현,유진홍,민우성,신완식,김춘추 대한감염학회 2005 감염과 화학요법 Vol.37 No.5

목적 : 본 연구에서는 국내 혈액질환 환자들에서 일차 항진균제를 부작용으로 인해 투여할 수 없거나, 일차 항진균제에 반응이 없는 침습성 진균 감염증의 구제치료로서 caspofungin의 효과와 이상반응에 대한 임상 경험을 소개하고, 예후인자를 분석해 보았다. 재료 및 방법 : Caspofungin은 첫날 70 mg, 이틀째 부터 50 mg을 하루 일회 투여하였고, caspofungin 종료시 그리고 종료 4주 후 반응을 평가하였다. 결과 : 총 55명의 환자가 분석에 포함되었고, 남자 32명, 여자 23명, 평균 나이는 38.2세(16-65세)였다. 기저 질환은 급성 백혈병 33명, 골수이형성 증후군 12명, 만성 백혈병 3명, 기타 7명이었다. 진균 감염은 확진 1명, 가능 5명, 추정 47명, 불확실 2명이었고, 감염 장소는 폐를 침범한 경우가 49명, 파종감염 6명이었다. 전체적으로 41.8% 환자에서 양호한 반응을 보였으며, 치료군, 치료후 기저질환의 상태, 침습성 진균 감염 진단시 호중구 감소증 여부, 스테로이드 등 면역억제제 사용 여부가 유의한 예후인자였다. 약제관련 이상반응은 14.5%에서 관찰되었고, 발열, 피부 발진, 간기능 저하 등으로 나타났다. 이중 4명에서 이상반응과 관련하여 투약을 중지하였고, 약제 중단 후 증상은 모두 호전되었다. Caspofungin 관련 신독성은 관찰되지 않았다. 결론 : Caspofungin은 국내 혈액질환 환자에서 침습성 진균 감염증의 구제치료에 효과적으로 안전하게 사용될 수 있겠다. 최근 여러 항진균제들이 개발되어 임상에 도입되고 있는 바, 항진균 작용 범위, 독성, 약역동학적 특성, 비용-효과면 등을 고려하여 환자별로 직절한 항진균제를 선택하도록 해야 할 것이다. Background : Invasive fungal infection (IFI) is an important cause of morbidity and mortality in patients with hematologic malignancy. Patients with IFI who fail to standard therapy have poor prognoses. We investigated the efficacy and safety of caspofungin (CAS) in Korean adults with hematologic diseases and IFI who did not respond to the conventional antifungal therapy. Materials and Methods : Patients with IFI refractory or intolerant to standard antifungal therapy received CAS 50 mg IV daily after 70 mg loading dose on day 1. Efficacy and safety of CAS were assessed in patients who received more than one dose. Favorable response [complete (CR) or partial (PR)] was defined as significant improvement of all clinical symptoms, signs, and radiologic abnormalities. Results : From Feb. 2004 to Feb. 2005, 55 patients who met the inclusion criteria were enrolled. There were 32 male and 23 female patients with mean age of 38.2 years (range, 16-65). Underlying diseases were acute leukemia (33 cases), myelodysplastic syndrome (12 cases), chronic myelogenous leukemia (3 cases), and other hematologic diseases (7 cases). Thirty-six patients were receiving chemotherapy and 13 patients were under hematopoietic stem cell transplantation (HSCT). The number of proven, probable, possible, and indeterminate IFI cases was 1, 5, 47, and 2, respectively. Conventional amphotericin B, intravenous itraconazole, and liposomal amphotericin B were administered for average of 14.9 days prior to administering CAS. Mean duration of CAS therapy was 12.8 days (range, 1-45). Twenty-three patients (41.8%) showed favorable responses (CR : PR=8 : 15) at the end of CAS therapy. Chemotherapy group, neutropenic state, remitted state of underlying disease, and no steroid therapy were significant prognostic factors for favorable response. Eight (14.5%) patients developed drug-related adverse events such as fever, skin eruption, and hepatic dysfunction which were reversible after discontinuation of CAS. Drug-related nephrotoxicity was not observed. Conclusion : On the basis of our investigation, CAS was effective and safe as a salvage therapy of refractory IFI or as an alternative for patients intolerant to standard antifungal agents.

비전시스템을 이용한 로봇 위치 제어에 관한 연구

장완식,신광수,백은석 조선대학교 생산기술연구소 1996 生産技術硏究 Vol.18 No.1

This paper presents three-dimensional robot task using the vision control method. A minimum of two cameras is required to place points on end effecters of n degree-of-freedom manipulators relative to other bodies. This is accomplished using a sequential estimation scheme that permits placement of these points in each of the two-dimensional image planes of monitoring cameras. Estimation model is developed based on a model that generalizes known manipulator kinematics to accommodate unknown relative camera position and orientation, etc. This model uses six uncertainty-of-view parameter estimated by the iteration method. The method is tested experimentally with three-axis manipulator in two ways; a) the estimation model test, b) a three-dimensional point placement task. These results show that control scheme used is precise and robust.