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Enhancement of Biomolecular Mass Transport by Electrophoresis in Nanoscale Biosensors
김효기,권성훈 한국바이오칩학회 2009 BioChip Journal Vol.3 No.2
We discuss the importance of active biomolecular transportation in nanoscale biosensors. Simulation results based on finite element method show the effect of electrostatic field driven by molecular transportation, and indicate that active driving force is necessary for efficient biomolecular detection in sample solution with low target concentration. Our numerical model provides a guideline to design nanoscale biosensors by considering various design parameters such as electric field intensity, molecular concentration, and sensor size.
슬라이딩 모드 제어를 이용한 단상 유도전동기의 저 전류 기동 시뮬레이션
김효기,이병하,Kim, Hyo-Ki,Lee, Byung-Ha 한국조명전기설비학회 2007 조명·전기설비학회논문지 Vol.21 No.8
단상유도전동기의 기동전류를 줄이기 위하여 슬라이딩모드 제어기가 적용된다. 단상유도전동기의 기동전류가 정격치 이하로 유지되도록 슬라이딩모드 제어기의 스위칭 기능을 조절함으로써 전동기 입력전압이 제어되며 또한 속도도 제어된다. 슬라이딩 모드 제어기의 스위칭은 속도 오차 신호와 속도 변화량에 대하여 적절이 수행된다. 단상 유도 전동기의 기동특성이 슬라이딩 제어기를 사용하여 크게 향상될 수 있음을 보여 준다. In this paper, the Sliding Mode Controller is applied to reduce the starting current of the single phase induction motor. The input voltage to the single phase induction motor is controlled so that the starting current of the motor may be maintained within the rating value and the velocity is also controlled, by adjusting the switching function of the Sliding Mode Controller. The switching of sliding control made appropriately with regard to velocity error signal and acceleration signal. It is shown that the starting characteristics of the single phase induction motor(SPIM) can be greatly enhanced through the sliding control of single phase induction motor.
김효기,심준섭 한국정책분석평가학회 2012 政策分析評價學會報 Vol.22 No.3
금융감독규제 기관의 금융규제 정책은 직접적인 대상인 금융기관 종사자들의 인식에 커다란 영향을 미친다. 따라서 금융기관 종사자가 금융감독규제 기관을 얼마나 신뢰하는가는 금융규제의 수용성을 결정하는 중요한 요인이다. 본 연구는 금융감독규제 기관의 독립성, 책임성, 투명성, 공정성, 전문성이 금융감독규제 기관에 대한 신뢰를 매개로 금융규제의 수용성에 미치는 영향을 구조방정식모형을 통해 실증적으로 분석하였다. 이를 위해 금융기관 종사자들을 대상으로 설문조사를 실시하고 분석에 필요한 자료를 수집하였다. 분석결과, 금융감독규제 기관의 독립성, 책임성, 투명성, 공정성, 전문성은 대상기관의 신뢰를 증진시키며, 신뢰는 금융규제의 수용성에 긍정적인 영향을 미치는 것으로 나타났다. 본 연구는 금융규제 의 수용성에 영향을 미치는 요인들에 대한 보다 분명한 관계를 실증분석했다는 점에서 커다란 의의를 갖는다.
김효기,김훈엽,박다원,김홍규 대한내시경복강경외과학회 2019 Journal of Minimally Invasive Surgery Vol.22 No.1
Transoral approach for thyroidectomy recently gains a lot of attention among the thyroid surgeons, with the merits of cosmetic outcomes and minimal flap dissection. We’ve successfully introduced the robotic surgical system to the transoral approach for thyroidectomy. For transoral robotic thyroidectomy, we made 3 incisions in the gingival-buccal sulcus for three intraoral ports. An additional axilla port was inserted for counter-traction and later drain insertion. Herein, our unique procedures of transoral robotic thyroidectomy (TORT) are described in the treatment of a patient with papillary thyroid carcinoma.
탈수 칼륨 및 칼슘-제올라이트 A 구조에서 큰바구니의 8-고리에 존재하는 양이온 1가 및 2가와 골격산화물 이온에 대한 화학 특성
손만식,박경원,백우현,김효기 국립경상대학교 공과대학 부설 첨단소재연구소 1992 尖端素材 Vol.2 No.-
Starting with the structural unit of 8-ring in supercage for dehydrated ?? and Ca-zeolite A, we studied chemical characterization and electronic structure and properties of monovalent ?? and divalent ?? cations with framework oxide ions of the above materials by semiempirical molecular orbital theory. On 8-ring in the supercage for dehydrated Tl and Ca-zeolite A, framework oxide ions are strongly bonded by chemical bonding. This results show structure stability of structural skeleton for z대lite A. When ?? or ?? cations are incorporated in 8-ring, framework oxide ions with ?? cation are bonded by chemical antibonding while framework oxide ions with ?? cation are weakly bonded by chemical antibonding. Charge transfer in ?? with framework oxide ions is moved ?? to 8-ring. Then, net charge of O atoms in 8-ring including ?? cation are increased. But, net charge of O atoms in 8-ring including ?? cation are decreased. With these results, we here indicate that ?? ion are located in the 8-ring and ?? ion are not located in the 8-ring. These results are supported by the recent X-ray experimental study by Kim et al..
응급의료센터에 내원한 복부통증 노인 환자에 대한 간호기록 분석
이효기,김종임 대한근관절건강학회 2019 근관절건강학회지 Vol.26 No.1
Purpose: This study was done to analyze nursing assessment and nursing care for pain in the electronic nursing recordsfor the elderly patients with abdominal pain visiting the Emergency Medical Center. Methods: This study is a descriptivestudy based on nursing records from January to December 2015. A total of 1155 records for elderly patients with abdominalpain were gathered. Results: The mean age of elderly patients whose records were analyzed was 75.2 years. Analysisof nursing records regarding pain management showed that semi-urgent severity (93.7%), direct emergency room visits(58%), and 6.01 hours of emergency room stay (6.01 hours)were the most frequently documented characteristics of theelderly patients with pain complaints. Recording time of nursing assessment for abdominal patients was 1.01 hour; theaverage pain intensity was 3.97. The mostly used nursing intervention for abdominal pain was medication (65.1%). Therewas no record of non-pharmacological pain nursing interventions. Conclusion: The results of this study showed thatimproving knowledge and nursing practice for pain management is much of necessity. In particular, development of thenon-pharmacological nursing interventions for pain is needed. Further research is also imperative to develop and evaluaterecord systems for pain management that can be used in the emergency room.
문효기(Moon Hyo-Gi),유정호(Yu Jung-Ho),김창덕(Kim Chang-Duk) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.7
In order to obtain good project performance, the performance of construction work process should be improved. Traditionally, good project performance means a project is on budget and on time with expected quality. Thus, most project managers have used project performance indicators concerning time, cost, quality, safety, profitability, etc. However, these performance indicators focus on a phase of company or project, and it is difficult of these performance indicators to discover potential problems. Thus, this paper suggests three concepts, based on TFV, that are reliability, efficiency and effectiveness to measure the performance of task and we apply them to construction site for usability.