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제지공정 Short Circulation의 동특성 해석
전준석,여영구,김영곤,강홍,Jeon, Jun-Seok,Yeo, Young-Gu,Kim, Young-Gon,Kang, Hong 한국펄프종이공학회 2003 펄프.종이기술 Vol.35 No.4
Analysis of the elements affecting short circulation in highly integrated paper mills and identification of the interactions among these elements are very important tasks to prevent operational perturbations such as web breaks. In the present work a dynamic model for the short circulation is developed to analyze tuning methods for the outputs to follow set points during grade change operations. Steady state operation data are used to investigate dynamic characteristics of responses for input changes.
전준석,박우철,김창선 국립7개대학공동논문집간행위원회 2003 공업기술연구 Vol.3 No.-
The push pull forward converter is a very suitable circuit for low output voltage, high output current applications with a wide input voltage range. All the magnetic components (output inductor, transformer, input filter) can be integrated into a single core. The integrated magnetics can reduce the number of the magnetic components. Developed the push pull forward converter rating are of 36~72V input and 3.3V/30A output. In this converter, the efficiency was measured by 76.4% at full load and 82.95% at half load. The maximum efficiency is up to 83.% at 200kHz switching frequency, 11A output.
외적주의집중에 따른 테니스기능 과제시 피드백 정보제공의 운동학습효과
전준석 한국체육과학회 2007 한국체육과학회지 Vol.16 No.4
The study examined whether the learning advantages of an optimal presentation of external focus feedback on tennis skill task. Participants without experience in tennis were required to practice forehand stroke. The practice phase consisted of 100 practice trials. They were randomly assigned to there experimental condition(10% external focus feedback, self control external focus feedback, and yoked group). One day after practice, a retention test of 30 trials without instructions was performed. I reached some conclusions as follow : First, appeared that self controled external focus feedback has more effective achievement than yoked group at practice performance. Second, tennis score's correctness degree was lower than last practice point of acquisition step usually in retention test who enforce day later but 10% external focus feedback showed that achievement score increases fast. At the beginning of the retention test on the following day, the accuracy of shot placements was generally lower than at the end of practice. Yet, three groups showed relatively rapid improvements across trial blocks. Self control external focus feedback group was more effective than 10% external focus feedback group at retention test. Tennis skill acquisition took effect that self control external focus feedback has more effective achievement.
요약 형식의 결과지식과 간격의 차이가 양궁 기록에 미치는 효과
전준석 한국스포츠심리학회 2004 한국스포츠심리학회지 Vol.15 No.1
본 연구는 Guay, salmoni, 와 Lajoie(1999)의 연구를 바탕으로 KR 간격조건과 요약된 형식의 KR조건의 상호작용효과 및 독립된 방식에서 안내가설의 지지여부를 통한 효과적인 KR 제공방법을 알아보기 위해 두 가지의 KR 간격 조건(20%, 100%)과 함께 세 가지의 요약형식 KR(ST, SUM, AVE)로 구분하여 총 6가지 형태의 KR(ST-20%, 100%, SUM 20%, 100%, AVE 20%, 100%)을 연구하였다. 양궁선수들을 대상으로 KR 간격과 요약 형식의 KR 조건에서 안내가설의 효과를 통한 효과적인 KR 제시 조건을 규명하고자 50m 실거리 과제를 선정하여 연습단계 30회 파지단계 30회를 실시 다음과 같은 결론을 얻었다. 절대오차에서는 파지수행에 있어서 ST조건이 효과적인 것으로 나타났으나 가변오차에서는 모든 조건에서 차이가 없는 것으로 나타났다. 요약형식의 KR제공 형태보다는 KR 간격의 조건이 학습에 보다 영향력이 있는 것으로 나타났으며, KR의 제공은 100%의 제공간격보다는 20%제공간격이 효과적임을 입증하였다. The participants were assigned to one of six conditions. The two spacing conditions were KR after every trial (100%) and after every fifth (20%). The three summarizing techniques were single trial KR, summary KR, and average KR. The six conditions were: single trial KR following every trial (ST-100%), single trial KR following every fifth trial (ST-20%), summary KR after each block of 5 trials (SUM-20%), summary KR of the most recent 5 trials presented after every trial (SUM-100%), average KR after each block of 5 trials (AVE-20%), and average KR of the most recent 5 trials presented after every trial (AVE-100%). Participants(n=3 per group) performed 30 acquisition trials of archery task, followed by 30 delayed(24 hour) no-KR retention trials. The results of this study are as follows: For the target goal, acquisition performance was more accurate(AE) for the 20% spacing condition than the 100% spacing condition, and more accurate during retention effect were significant for the 20% spacing condition and ST condition in absolute constant error. There were no significant main effects or interactions for VE during the acquisition trials, but more accurate (VE) for the 20% spacing condition than the 100% spacing condition during retention performance. The analysis indicated that AE and VE score was greater for the 100% spacing condition than the 20% spacing condition.
최소침습적 치조정 접근법을 통한 상악동점막 거상술: 증례보고 및 문헌고찰
전준석,김영균 대한구강악안면임플란트학회 2017 대한구강악안면임프란트학회지 Vol.21 No.3
Maxillary sinus lifting by crestal approach is minimal invasive method and has several advantages over lateral approach. Being crestal approach safely, a variety of techniques were developed. This report demonstrates clinical cases of successful crestal sinus lifting with that ways and explains that techniques. With these techniques, implants were placed safely without excessive bleeding and membrane perforation. Postoperative x-ray also showed successful results in all the ways thus these new techniques should be recommended as safe sinus lifting technique.
Neural network을 이용한 OPR예측과 short circulation 동특성 분석
전준석,여영구,강홍,박시한 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.1
제지공장의 short circulation의 동특성을 규명하고 제어하는 것은 효율적인 공정 운영의 필수 요소이다. 현재 제지공장은 지종교체 상황에서의 시간과 비용 절감을 위하여 최신의 기기를 도입하여 공정효율을 꾀하고 있다. 본 연구에서는 neural network를 이용한 One Pass Retention(OPR) 예측 방법을 제안하였고 이를 이용하여 short circulation의 동특성을 분석하였다. Short circulation에서는OPR의 변화가 제지성상에 큰 영향을 주는 인자이며 OPR에 영향을 미치는 인자도 다양하므로 지종교체시의 조업 데이터를 통한 학습의 결과로 OPR을 예측한 후 이 결과를 모델식에 적용하여 short circulation이후의 유량과 농도를 유추하였다. 이로부터 short circulation에서의 input과 output의 관계와 각 인자들의 관계를 분석할 수 있었다.