• 전기학회논문지
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• 제61권11호
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• pp.1743-1747
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• 2012

The research of superconducting fault current limiter (SFCL) for reduction of the fault current is actively underway in the worldwide. In this paper, we analyzed the characteristics of a SFCL using the transformer and superconducting elements combined mutually in accordance with the fault types. The structure of this SFCL was composed of the secondary and third windings of a transformer connected to the load and the superconducting element, respectively. The provided electric power flew into the load connected to the secondary winding of the transformer in normal state. On the other hand, when the fault occurred in power system, the fault current was limited by closing the line of third winding of the transformer. At this time, the effect of the fault was minimized by opening the fault line in secondary winding of a transformer in power system. The sensing of the fault state was performed by the current transformer(CT) and then turn-on and turn-off switching behavior of the secondary line in the transformer was performed by the silicon-controlled rectifier(SCR). As a result, the proposed SFCL limited the fault current within one-cycle efficiently. Also, the degradation of the superconducting element in the normal state was avoided.

• 대한한의학원전학회지
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• 제19권2호통권33호
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• pp.97-107
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• 2006

From the study on the relation of voice and O-jang(五臟廳), the conclusion is as follows. The function of breathing out in larynx is involved with lung and kidney. Lung press out the air, at the same time, kidney supports that to maintenance the density of air constantly. So the person who has short breathing can not make strong voice, and also if having a weak kidney in upper Cho[下蕉], their voice will be changed so very softly to cannot make hard type of voice and lingering sounds. Opening and Closing of vocal cords are controled by liver and spleen. when vocal cords are contracted, liver makes tension, whereas spleen does in slackness. So liver is likely to make high-piched sounds in tension of vocal cords, and spleen is the same to do smoothy and husky sounds through relaxing the vocal cords. In the rising condition of liver function, the temp of speech become fast, and more the pronunciation is clearer, it means that the function of thinking by spleen is operated well. Otherwise, indistinct pronunciation means that in the body seup-sa(濕邪) spreads. Also depression of emotion in speech often makes Gi(氣) of heart weaker, whereas it means regular condition of heart including Simpo(心包) that expression of emotion looks happy.

• 한국융합학회논문지
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• 제5권3호
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• pp.41-44
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• 2014

Sequential object analysis are playing vital role in real time application in computer vision and object detections.Measuring the similarity in two images are very important issue any authentication activities with how best to compare two independent images. Identification of similarities of two or more sequential images is also the important in respect to moving of neighborhoods pixels. In our study we introduce the morphological and shared near neighborhoods concept which produces a sufficient results of comparing the two images with objects. Considering the each pixel compare with 8-connectivity pixels of second image. For consider the pixels we expect the noise removed images are to be considered, so we apply the morphological transformations such as opening, closing with erosion and dilations. RGB of pixel values are compared for the two sequential images if it is similar we include the pixels in the resultant image otherwise ignore the pixels. All un-similar pixels are identified and ignored which produces the similarity of two independent images. The results are produced from the images with objects and gray levels. It produces the expected results from our process.

• 한국세라믹학회지
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• 제35권10호
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• pp.1061-1069
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• 1998

The thermal instability of Al2TiO5 Ceramics was contrlled by solid solution with MgO SiO2 and ZrO2 through electrofusion in an arc furnace. The thermal expansion properties of Al2TiO5 composites show the hysteresis due to the strong anisotropy of The crystal axes of these material. These phenomena are ex-plained by the opening and closing of microcracks. The difference in microcracking temperatures e.g 587.6(ATG2), 405.9(ATG3) and 519.7$^{\circ}C$(ATG4) is caused by the difference in grain size and stabilizer type. The thermal shock behaviour under cyclic conditions between 750-1400-75$0^{\circ}C$ show no change in mi-crostructure and phase assemblage for all three stabilized specimens. After the thermal loading test at 110$0^{\circ}C$ for 100hrs. ATG1 and ATG2 materials decomposes completely to its components corundum and ru-tile in both cases. However with approximatelly 20% retention of the Al2TiO5 Thus in order to prevent decomposition of the stabilized material in the critical temperature range 800-130$0^{\circ}C$ it must be traversed within a short period of time.

• 조명전기설비학회논문지
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• 제29권11호
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• pp.89-95
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• 2015

As a solution of improving the energy efficiency in power system, Low Voltage DC (LVDC) distribution systems different from conventional ones have been constantly researched. As in conventional AC distribution system, LVDC distribution system can suffer from High Impedance Fault (HIF) which may cause a failure of protective relay due to relatively low change in magnitude of fault current. In order to solve the problem, a scheme for detecting HIFs is presented in this paper. Closing Opening Difference Operation (CODO) based on Mathematical Morphology (MM), one of the MM-based filters, is utilized to make fault signals discriminable. To verify performance of the scheme, a simple LVDC distribution system is modeled by using ElectroMagnetic Transient Program (EMTP) software. Computer simulations according to various conditions are performed and comparison studies with a scheme using Wavelet Transform (WT) in an aspect of simulation time are also conducted.

• 한국멀티미디어학회논문지
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• 제23권12호
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• pp.1454-1463
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• 2020

An important factor in eye-tracking PC interface for general paralyzed patients is the implementation of the mouse interface, for manipulating the GUI. With a successfully implemented mouse interface, users can generate mouse events exactly at the point of their choosing. However, it is difficult to define this interaction in the eye-tracking interface. This problem has been defined as the Midas touch problem and has been a major focus of eye-tracking research. There have been many attempts to solve this problem using blink, voice input, etc. However, it was not suitable for general paralyzed patients because some of them cannot wink or speak. In this paper, we propose a mouth-pop-up, eye-tracking mouse interface that solves the Midas touch problem as well as becoming a suitable interface for general paralyzed patients using a common RGB camera. The interface presented in this paper implements a mouse interface that detects the opening and closing of the mouth to activate a pop-up menu that the user can select the mouse event. After implementation, a performance experiment was conducted. As a result, we found that the number of malfunctions and the time to perform tasks were reduced compared to the existing method.

• 한국수산과학회지
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• 제56권2호
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• pp.259-264
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• 2023

Day-night vertical euphausiid distribution was investigated at three stations in the East Sea using a Multiple Opening/Closing Net and Environmental Sensing System (MOCNESS). Three euphausiid species were recognized. Euphausia pacifica was more dominant than Thysanoessa longipes. Euphausiids were collected at Station 1 at night, Station 2 at sunset, and Station 3 during the daytime. At Station 1, calyptopis and furcilia stages were concentrated from the surface to 30 m and 20-40 m, respectively. Juveniles and E. pacifica were distributed in strata shallower than 30 m. At Station 2, calyptopis and furcilia stages were dominant in strata from the surface to 40 m. Juveniles were not recorded in strata at 30-100 m. However, E. pacifica occurred in these strata. At Station 3, calyptopis and furcilia stages occurred in the upper 40 m of strata. E. pacifica was distributed deeper than 100 m and rarely occurred above 100 m. The furcilia stages weakly migrated, whereas the calyptopis stages did not. Juveniles and E. pacifica showed a clear migration pattern. Vertical distribution of euphausiids in the northern East Sea varied by life stage and time of day.

• 한국주거학회논문집
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• 제23권1호
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• pp.27-41
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• 2012

The objective of this study is to develop the blind control strategy and method which reduce negative effect of incoming daylight on visual comfort of occupants, minimize psychological anxieties caused by frequent motions of a blind, and maximize positive effect of incoming daylight and solar irradiation by opening/closing of a blind. As previous researches on blind controls have limited outdoor environmental conditions to those in specific regions, orientations and dates, these resulted in problems at various conditions for general-purpose application. Major problem is that the time interval and amount of blind movement do not meet the control objective at the end of control zone and discontinuous curve. To overcome these limitations revealed in the previous researches, following tasks were performed in this study. 1) To establish the control objective to accomplish the goal of this study. 2) To develop the control methods and algorithms which prevent glare on the work-plane at any time and which control the time interval and amount of blind movement to follow the control objective at various profile angle curves. 3) To validate the general-purpose applicability and performance of the developed control methods and algorithms by simulation and its data analysis at various conditions. It was found that the proposed methods and algorithms can prevent the direct glare on the work-plane at all the time and also increase the incoming daylight and solar irradiation.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제27권3호
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• pp.239-249
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• 2001

저자는 1999년 6월부터 2000년 4월까지 경북대학교병원 구강악안면외과에서 하악골 후퇴를 위해 SSRO 혹은 LeFort I 골 절단술을 동반한 SSRO를 시행받은 환자 42명을 대상으로 술전, 술후 1개월, 술후 6개월에 각각 MKG를 이용하여 하악운동량 및 양상을 조사하고 이를 몇 가지 요소에 따라 군으로 나누어 계측치를 측정, 연구한 바 아래와 같은 결과를 얻었다. 1. 남녀 성별에 따른 두 군 사이에서, 좌측운동량의 변화 및 최대 개구속도의 변화량은 유의한 차이가 있었으며(p<0.05), 그 외의 항목은 차이가 없었다. 2. SSRO만을 시행 받거나 혹은 LeFort I을 동반하여 SSRO를 시행받을 경우, 수술방법에 따른 하악운동량의 변화는 유의성이 없었다.(p>0.05) 3. 하악골이동량에 따른 세 군에서 각 군사이의 하악운동량의 변화는 좌측 측방운동량에서는 $6{\sim}10mm$의 이동군이 가장 우수하였으며(p<0.05), 그 외의 항목은 통계적 유의성이 없었다. 4. 하악골의 개폐구 양상은 전두면 상에서 술전이 복잡편향형, 단순편향형, 복잡편위형, 단순편위형, 직선형 순이었고 술후 1개월에서는 단순편향형, 단순편위형, 복잡편위형, 직선형, 복잡편향형 순이며, 술후 6개월에서는 술전과 같은 순서였다. 또한 시상면상에서는 술전에 비일치형이, 술후 1개월에서는 일치형이 술후 6개월에서는 다시 비일치형이 우세하였다. 5. 술전 관절증의 증상유무에 따른 두 군사이의 하악운동량의 변화에는 통계적 유의성이 없었다(p>0.05). 6. 과두재위치장치를 적용한 군과 적용하지 않은 군에서, 두 군사이의 하악운동량의 변화에는 유의성이 없었다(p>0.05). 7. 술전 관절증이 있었던 환자중 술후 관절증의 완화가 나타난 경우가 63% 였으며, 과두재위치장치를 적용하지 않은 군에서 술후 관절증의 완화가 더 유의성있게 나타났다(p<0.05).를 보였으며 복합 레진은 유의차가 없었다. 상악 견치 (8%), 하악 제 1소구치 (5%) 순이었다. 10. I군에서 추정되는 낭의 발생 원인으로는 치수절단술을 받은 유치가 59.2%로 가장 많았고 이외에 심한 우식 및 치료 받지 않은 외상 병력등 기타 가능한 원인들이 있었다. 11.함치성 낭의 치료법으로는 I군의 경우 61.2%에서 조대술이 시행되었고, II군과 III군의 경우 61.1%, 80.0%에서 적출술이 시행되었다.mH I처치시 SM1과 SM2는 4조각의 절편으로 절단되어 같은 양상을 보였고, GS톤의 경우는 3조각의 절편으로 절단되었다. Kpn I, Sma I, Xho I 그리고 Pst I에는 절단되지 않았다.s subsp. salicinius와 유전자 유사치가 99.60%, 99.73%를 보여 Lactobacillus salivarius subsp. salicinius로 동정되었다. 이상의 결과를 종합하면 치아우식증이 없는 소아의 타액에서 분리된 유산균 중 과산화수소를 분비하여 인공치태 형성과 휘발성 유황화합물 생성을 억제하는 분리균주는 Lactobacillus salivarius subsp. salicinius로 동정되었다.적으로 낮은 수축률과 우수한 물성을 보였으며, 나노필러를 사용한 복합레진의 경우, 기존의 hybrid 필러를 이용한 레진에 비하여 수축응력을 감소시키지는 못하였다. 나노필러를 이용한 복합레진은 개발의 초기단계이며, 물성의 증가를 위한 연구가 필요할 것으로 사료된다.또 다른 약물인 glycyrrhetinic acid($100{\mu}M$)도 CCh 자극으로 인한 타액분비를 억제하였다. 이상의 결과로 미루어 gap junction은 흰쥐 악하선 세포로부터의 타액분비 조절에 중요한 역할을 하는데, 이는 gap junction이 세포막 $Ca^{2+}$ 통로를 조절함으로써 수용체 자극으로 유발된 세포내

• 한국산학기술학회논문지
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• 제18권11호
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• pp.755-761
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• 2017

교류 철도차량에 사용되는 주회로차단기 (Main Circuit Breaker)는 전차선 전원을 차량 내 투입 또는 차단하는 기능을 한다. 일반적으로 주회로차단기는 판토그라프와 주변압기 사이에 위치하며, 주회로차단기의 동작시점에 따라 차량에 투입되는 전원의 위상이 변화하게 된다. 투입전원의 위상에 따라 차량 내 돌입전류, 서지전압 등의 형태로 차량 전기장치 내 의도하지 않은 과도현상이 야기될 수 있으므로, 주회로차단기의 동작은 전차선 전원의 위상각에 따라 능동적으로 제어되어야 한다. 하지만 주회로차단기는 동작신호 인가 이후, 실제 개폐 동작 시까지 일정하지 않은 동작지연시간이 존재한다. 따라서 동작 지연시간을 예측하고, 이를 고려하여 주회로차단기를 개폐시점을 제어하는 지능형 제어기가 필요하다. 본 논문에서는 주회로차단기의 투입전원 위상 제어를 위하여 동작 메카니즘 및 동작 지연요소를 분석하였다. 그리고 차단기 및 구성품 별 반복동작시험을 통하여 동작 지연시간을 분석하고, 이를 예측하기 위한 이동평균 (Moving Average) 알고리즘을 제안하였다. 또한 지능형 제어기 개발 및 제작을 통하여 제안된 알고리즘을 구현하였으며, 주회로차단기와의 연동시험을 통하여 알고리즘의 성능을 검증하였다.