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      • KCI등재

        Robust voltage model flux estimator design with parallel vector compensator for sensorless drive of induction motor

        Gwon‑Jae Jo,Jong‑Woo Choi 전력전자학회 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.1

        Flux estimator (FE) is critical for achieving high-performance sensorless drive of induction motors. A voltage model (VM) is an excellent candidate for a FE since it does not require speed information and has a simple structure. A VM using a closed-loop style has excellent sensorless drive capability over a wide speed range. However, it is limited by the uncertainties such as offset and parameter mismatch. This paper presents an improved a closed-loop style FE. To overcome the problems inherent in the conventional FE, a hybrid strategy for the changeover between control modes is applied. In the setting of the FE’s cutoff frequency (CF), the influences of the offset and parameter mismatch are analyzed. The phase distortion and acquisition of the back electromotive force are also analyzed. From this analysis, a vector compensation strategy for the flux linkage is applied. This strategy facilitates the CF setting, which improves the robustness against both the offset and parameter mismatch. Finally, the effectiveness of the proposed FE in a sensorless driven induction motor is verified using simulations and experiments under various conditions.

      • KCI등재

        중국의 국유기업제도 개혁과정에 관한 연구

        백권호 계명대학교 국제학연구소 2000 국제학논총 Vol.5 No.-

        The reform of state enterprise system has been the foremost part of the reform process in China since she had proclaimed often door policy together with economic system reform at December 1978. Even though it is generally being accepted that the system reform has been quite successful in China comparing with those of other former socialist countries in once-called eastern europe before, there is no clear evidence yet to have succeeded specially in the field of state enterprise reform. So China has been executing three major reform programs as a millenium project in the sectors of state enterprise system, financing market rood governmental organization that are quite closely interrelated one another in the viewpoint of governance structure of state enterprise system. Since 1992, the year when China has defined her economic system as socialistic market economy or market economy of socialism, she has been experimenting a thoroughly different system's reform from the conventional system of socialism in terms of social paradigm or ideology. The focal point of this reform process is introducing a market for property rights combined with a capital market. This paper tries to review all the reform process of Chinese state enterprise system from 1978 when starting her system's reform at the viewpoint of 'ser-M' approach developed by Cho & Lee(1995). In this approach, 's' denotes as a CEO(subject) of a firm, while 'e' as business environment and 'r' as resources of a firm respectively, where 'M' means for interaction mechanism among above three factors. This paper suggests that the process of reform for chinese enterprise system is on the verge of drastic chage in terms of governance structure from power delegation to limited corporation. The proclamation of market economy including capital & property one makes it possible for China to reform the state enterprise system into contemporary limited corporation system. The reform of labor market which not only external but also internal including CEO's, also plays a very important role as a pushing factor for the state enterprise reform. Finally, stepwise and try & error-based reform process makes it possible for China to minimize a transaction cost of purchasing(or selecting) a reform product for institutional change thru learning mechanism.

      • KCI등재
      • KCI등재
      • PM 공간에서 공통 부동점 정리

        정권수,조정구 順天大學校 師範大學 附屬 科學敎育硏究所 1994 科學과 敎育 Vol.2 No.-

        PM 공간에서 타입 (A)의 양립 사상의 성질을 이용하여 Fisher의 일반화된 축소 사상의 조건을 만족하는 사상들의 공통 부동점 정리를 증명하였다.

      • Ag_2Se電極을 利用한 할로겐산이온과 할로겐화이온의 混合物의 電位差 適定

        印權植,閔泰원 東國大學校 1977 論文集 Vol.16 No.-

        銀 이온 選擇性 電極을 指市電極으로 使用하여 브롬산이온(BrO_3^-)과 요오드산이온 (IO_3^-)의 단독정량과 요오드산이온(IO_3^-), 요도드화이온(I^-)과 브롬화이온(Br^-)의 혼합물을 전위차 적정법으로 定量하였다. 사용한 銀 이온 選擇性 電極은 直接 製作한 Ag_2Se電極 이었다. 混合物 電位差 滴定을 할때는 理論的인 當量點과 變曲點의 誤差를 감소시키기 爲하여 뭉침제로서 에칠알콜, 질산나트륨, 덱스트린, 니트로벤젠 등을 사용하였다. 뭉침제를 사용함으로서 I^-과 IO_3, Br^-와 IO-3^-, 또한 Br^-, I^-, IO_3^-의 混合物 定量時 第一, 第二變曲點에서 誤差를 줄일 수 있었으며 비교적 좋은 結果를 얻었다. Potentiometric titration of iodide, bromide and iodate in mixtures, bromate, iodate with silver nitrate using silver ion-selective electrode, indicator electrode, has been studied. Silver ion-selective electrode was a sintered silver selenide electrode which had been prepared in this laboratory. In the titration of mixture solution, early alcohol, sodium nitrate, dextrin, and nitrobenzene as flocculant have been used to decrease the relative error of inflection point to theoretical equivalent point. The relative error of first and second inflection point in the titration of iodide and iodate, bromide and iodate, bromide, iodide, and iodate, respectively, was decreased, and attained the good results.

      • 스포츠센터 직원의 의사소통과 직무성 및 직무만족의 관계

        한권상,임상호 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.6

        This study is designed to shed a light on the relationship between communication, job performance and job satisfaction on sport center employee 250 employees were chosen from sport center located in Seoul. Among 250 questionnaires distributed and collected, 23 were excluded from the study because they were not either thoughtfully or completely answered. As a result, only 227 questionnaires were adopted and analyzed. The reliability test by using Cronbach's alpha method has the following results: the reliability in upward communication is .9132., the reliability in downward communication is .8505, the reliability in horizontal communication is .8963, the reliability in job satisfaction is .8282, the reliability in pay, promotion is .8406, the reliability in work environment is .8007 and the reliability in association is .7988. This paper utilizes the statistical data analysis methods including correlation analysis and regression analysis. The findings acquired based on the aforementioned research methods and data analysis are as follows: First, job performance showed a significant difference about upward communication, and upward communication had 28.2%(R²=.282) of influence about job performance. Second, job performance showed a significant difference about downward communication, and downward communication had 23.6%(R²=.236) of influence about job performance. Third, job performance showed a significant difference about horizontal communication, and horizontal communication had 30.0%(R²=.300) of influence about job performance. Fourth job satisfaction showed a significant difference about upward communication, and upward communication had 28.3%(R²=.283) of influence about job satisfaction Fifth, job satisfaction showed a significant difference about downward communication, and downward communication had 26.1%(R²=.261) of influence about job satisfaction. sixth, job satisfaction showed a significant difference about horizontal communication, and horizontal communication had 18.4%(R²=.184) of influence about job satisfaction. seventh, job performance showed a significant difference about job satisfaction and job satisfaction had 43.6%(R²=.436) of influence about job performance.

      • 한국음악 선율의 多音性(Mehrstimmigkeit)연구 : 영산회상에 기하여

        송권준 부산대학교 예술대학 2003 藝術論文集 Vol.17 No.-

        Recently the issue, of special feature of melody line in Korean traditional music, was proposed. As a new idea "mehrstimmigkeit" was proposed instead of "heterophony" of melody line in Korean traditional music. As a result on study of mehrstimmigkeit of Yeongsanhoesang 靈山會相, the representative instrumental music, there are three types of mehrstimmigkeit. The three types are two-tones, three-tones, four-tones type per one beat in five instrumental melody, Daegun 大琴·Piri??·Haegum奚琴·Gayaeum伽倻琴·Geomungo玄琴. The melodies of mehrstimmigkeit form 41% of all in Yeongsanhoesang. And two-tones type of mehrstimmigkeit form 31%. three-tones type 9.4%, four-tones type 0.6% of all. The most colorful tune among 9 tunes Yeongsanhoesan is Sanghyeondoduri. On the contrary the most monotonous tune is Garakdeori. The most numerous type of between each instrumental melody in two-tones type is "wind melody:string melody", for instance "Daegum·Piri·Haegum:Gayagum·Geomungo" The most numerous type of between each instrumental melody in three-tones type is "wind melody(Daegum·Piri·Haegum): string melody(Gayagum):string melody (Geomungo)". In four-tones type there are a few types but no peculiarity. The "mehrstimmigkeit", a special feature in Yeongsanhoesang melody line, explains Hwa-I-Bu-Dong和而不同(means harmony of dissimilary) in Korean traditional music.

      • Urea 박테리아 전극에 관한 연구

        인권식,최창진,김봉원,손무정,김인탁 圓光大學校 基礎自然科學硏究所 1987 基礎科學硏究誌 Vol.6 No.2

        Proteus vulgaris 를 ammonia와 carbon dioxide gas-sensor에 고정시켜 감응도와 재현성이 우수한 요소에 대한 박테리아 전극을 직접 제조하여 pH, 온도, 완충용액, 박테리아의 양, 여러 가지 아미노산 및 무기염류에 대한 영향과 전극의 수명 등에 관하여 조사하였다. 먼저 ammonia-박테리아 전극은 25℃에서 pH 7.4인 0.05M phosphate 완충용액을 사용하였을 때가 최적이었으며, 7.0 ×10 exp (-4) -3.0 ×10 exp (-2)M 내에서 직선을 나타내었고, 이때 감응도는 116.7mV/decade였다. 한편, carbon dioxide-박테리아 전극은 30℃, pH7.0, 0.1M phosphate 완충용액에서 가장 우수한 감응을 보였다. 이 경우는 7.0 ×10 exp (-4) - 5.0 ×10 exp (-2)M 내에서 45.4 - 45.7mV/decade를 나타내었다. 이들 두 전극중에서 carbon deoxide-박테리아 전극을 이용하여 요소를 정량한다면 방해물질들의 방해가 최소화되었다. 실제 임상적 응용에서 분광 광도법과 비교한 결과 실험과정이 간단하고 편리하여 신속하게 많은 양의 시료분석이 가능하다. Bio-electrodes for urea have been constructed by immobilizing the Proteus vulgaris on ammonia and carbon dioxide gas-sensors. The bacteria containing urease convert each molecule of urea into two molecules of ammonia and one molecule of carbon dioxide gas. Ammonia-bacterial electrode based on ammonia gas-sensor has linearity in the range of 7.0 ×10 exp (-4) - 3.0 ×10 exp (-2)M urea in pH 7.4, 0.05M phosphate buffer solution at 25℃. While carbon dioxide-bacterial electrode based on carbon dioxide gas-sensor has linearity in the range of 7.0 ×10 exp (-4) - 5,0 ×10 exp (-2)M urea in pH 7.0, 0.1M phosphate buffer solution at 30℃. These electrodes were investigated for the effects of pH, temperature, buffer solutions, bacterial amounts and interferences, and life time. As the clinical applications, urea in urine was determined by these devices and was compared with spectrophotometric method. As the results, those methods were by far more simple and rapid than these method.

      • 現行 男唱歌曲의 노래선율 硏究

        송권준 부산대 예술대학 1997 藝術論文集 Vol.12 No.-

        Korean traditional lyric song (kagog 歌曲) are sung in two modes- pyoungjo (平調, the other name-ujo 羽調) and kyemyounjo (界面調)-and in two styles, sung by male and female. The pyoungjo kagog by male are all 11 tunes and the kyemyounjo are 13. Almost of precedent studies on kagog are dependent upon ancient notes for keomungo(玄琴). Therefore the result of studies on kagog is by accompanied melody of keomungo only. This study is on the melody of all songs in kagog by male. It was founded that cadence is related with construction of poetry and melody. Properly division of chapter is determined by cadence. There are three lineage in pyoungjo kagog. - isudaeyop 貳數大葉 lineage ; isudaeyoup 貳數大葉·junggeo 中擧·pyounggeo 平擧·tugeo 頭擧·wooling 羽弄·panyoup 半葉 - lak 樂 lineage ; woorak 羽樂·ollak 言樂 - pyoun 編 lineage ; woopyoun 羽編·pyoullak 編樂 Also there are three lineage in kyemyounjo kagog. - isudaeyop 貳數大葉 lineage ; isudaeyoup 貳數大葉·junggeo 中擧·pyounggeo 平擧·tugeo 頭擧·taepyoungga 太平歌·panypoup 半葉 - nong 弄 lineage ollong 言弄·pyoungnong 平弄 - pyoun 編 lineage pyounsudaeyoup 編數大葉·ollpyoun 言編·pyoullak 編樂

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