• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 2001년도 추계학술대회 학술발표 논문집
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• pp.83-86
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• 2001

In injection molding, short shot is one of the frequent and fatal defects. Experts of injection molding usually adjust process conditions such as injection time, mold temperature, and melt temperature because it is the most economic way in time and cost. However it is a difficult task to find appropriate process conditions for troubleshooting of short shot as injection molding process is a highly nonlinear system and process conditions are coupled. In this paper, a fuzzy neural network(FNN) has been applied to injection molding process to shorten troubleshooting time of short shot. Based on melt temperature and fill time, a reasonable initial mold temperature is recommended by the FNN, and then the mold temperature is inputted to injection molding process. Depending on injection molding result, specifically the insufficient quantity of an injection molded part, an appropriate mold temperature is recommend repeatedly through the FNN.

• 한국환경농학회지
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• 제40권1호
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• pp.20-32
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• 2021

BACKGROUND: Bacterial shot hole of stone fruits is a seriuos plant disease caused by Xanthomonas arboricola pv. pruni (Xap). Techniques to control the disease are required. In this study, microorganisms with antibacterial activity were isolated to develop as a microbial agent against the bacterial shot hole. METHODS AND RESULTS: An isolate with the strongest activity among the isolates was identified as Streptomyces avidinii based on 16S rRNA gene sequence analysis and designated Streptomyces sp. J46. J46 showed suppression of bacterial leaf spot with a control value of 90% at 10 times-diluted cell free supernatant. To investigate antibacterial metabolites produced by J46, the supernatant of J46 was extracted with organic solvents, and the extracts were subjected to chromatography works. Antibacterial metabolites were not extractable with organic solvents. Both reverse and normal phase techniques were not successful because the metabolites were extremely water soluble. The antibacterial metabolites were not volatiles but protein compounds based on hydrolysis enzyme treatment. CONCLUSION: Our study suggests that Streptomyces sp. J46 may be a potential as an microbial agent against bacterial shot hole. Further study to identify the metabolites is required in more detail.

• 한국공작기계학회논문집
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• 제11권4호
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• pp.44-53
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• 2002

Injection molding process factors such as molding temperature, injection pressure, flow rate and flow velocity, must be controlled properly in filling and packing phases in the injection molding process. In this study, effects of these factors on the injection molding were investigated through the flow analysis for the filling and packing phases. Molding troubles like flow mark weld line, sink ma가 short shot and warpage car be caused by these injection molding process factors. Among them the short shot was caused by the fact that the packing pressure could not reach properly to the filling end part in the packing phase and hence the flow rate could not be supplied to the full. In addition as the flow rate for the volumetric shrinkage during the f개zen phase could not be supplied Properly by the packing pressure, the short shot appeared. Here, the volumetric shrinkage reduced with increasing the packing pressure and also the warpage of molded part increased with increasing the packing Pressure.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 C
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• pp.1334-1336
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• 2001

In this study, laser ablation atomic fluorescence (LAAF) spectroscopy has been applied for a nanometer-scale surface analysis of Na-doped polymethyl methacrylate (PMMA). LAAF spectroscopy is a new sensitive element detection technique which involves atomizing of a sample by the laser ablation and detection of ablated plume by laser-induced fluorescence (LIF) spectroscopy. Using this technique in the detection of Na atoms with Na-doped PMMA, a detection limit is obtained as 36 fg for single laser shot. Further, the depth distribution in the sample is measured with a very high spatial resolution using a two-layer PMMA sample by observing the shot-by-shot LIF intensity from the Na atoms.

• 지구물리와물리탐사
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• 제7권1호
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• pp.7-13
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• 2004

In this paper, we demonstrate that Common Mid-Point (CMP) cross-correlation gathers of multi-channel and multi-shot surface waves give accurate phase-velocity curves, and enable us to reconstruct two-dimensional (2D) velocity structures with high resolution. Data acquisition for CMP cross-correlation analysis is similar to acquisition for a 2D seismic reflection survey. Data processing seems similar to Common Depth-Point (CDP) analysis of 2D seismic reflection survey data, but differs in that the cross-correlation of the original waveform is calculated before making CMP gathers. Data processing in CMP cross-correlation analysis consists of the following four steps: First, cross-correlations are calculated for every pair of traces in each shot gather. Second, correlation traces having a common mid-point are gathered, and those traces that have equal spacing are stacked in the time domain. The resultant cross-correlation gathers resemble shot gathers and are referred to as CMP cross-correlation gathers. Third, a multi-channel analysis is applied to the CMP cross-correlation gathers for calculating phase velocities of surface waves. Finally, a 2D S-wave velocity profile is reconstructed through non-linear least squares inversion. Analyses of waveform data from numerical modelling and field observations indicate that the new method could greatly improve the accuracy and resolution of subsurface S-velocity structure, compared with conventional surface-wave methods.

• 한국운동역학회지
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• 제22권2호
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• pp.159-171
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• 2012

The purpose of this study was to provide information about kinematic variables of the gliding and delivery motion of Hyung-Keun Lee, a high school shot putter who was ranked 1st at the 2011 National Sports Festivals. Three-Dimensional motion analysis using a system of 4 video cameras at a sampling frequency of 60 Hz was conducted during shot-putting events at the 2011 National Sports Festivals. During the gliding and delivery phase of the player the results showed following characteristics; 1) The gliding technique types of the player appeared to be the short-long technique as the gliding and stance length ratio were $42.3{\pm}3.87$ % and $57.7{\pm}3.87$ %, respectively. In addition, the trajectory of shots during the gliding and delivery phase showed different trajectory patterns with "S-shaped" type of elite players due to the deviation from a central axis of the APSS (athletic-plus shot system). 2) The horizontal velocity of COG made from gliding should maintain the velocity during transition and release phase, but the player showed a small momentum for a gradual decrease of velocity. 3) Therefore, the player requires to adjust an appropriate ratio between gliding and stance length with a strong muscle power at the trunk, throwing arm, and the lower extremity during gliding and delivery phase.

• 한국멀티미디어학회논문지
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• 제10권8호
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• pp.967-980
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• 2007

동영상에서의 관심 객체를 추출하는 것은 비디오 내용 분석과 비디오 검색 및 압축의 성능을 개선시키는데 큰 역할을 한다. 관심 객체는 단순히 사람 눈의 시선을 끄는 대상물이 아니라 내용전개의 중심이 되거나 제작자가 표현하려고 하는 핵심 객체를 의미한다. 이러한 관심 객체는 움직이는 객체뿐만 아니라 정지해 있는 객체도 될 수 있으나, 사람의 관심을 절차적으로 표현하는 것이 어렵기 때문에 관심 객체를 명확하게 정의하기가 곤란하다. 이에, 본 논문에서는 동영상 샷에서의 움직이는 객체의 위치, 크기, 움직임 패턴의 변화에 대한 조건을 정의하여 필터링에 의해 사람의 관심을 끄는 움직임 관심 객체를 추출하는 방법을 제시하고, 아울러 동영상 샷에서 정지되어 있는 객체에 대해서도 컬러/텍스처 특이성, 위치, 크기, 출현 빈도 등에 대한 조건을 정의하여 정지 관심 객체도 추출할 수 있는 방법을 제안한다. 제안한 방법을 50개의 동영상 샷에 대하여 실험한 결과, 사람이 선정한 움직임 및 정지 관심 객체를 84% 정도 추출할 수 있음을 확인할 수 있었다.

• 한국운동역학회지
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• 제19권2호
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• pp.311-322
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• 2009

본 연구는 골프 기술 가운데 하나인 페이드샷에 대하여 3차원 영상분석을 시도하여 비교분석한 연구이다. 연구 대상은 남자 프로 골프선수 3명을 대상으로 하였으며 7번 아이언으로 국한하여 실험을 실시하였다. 이때 운동학적 주요 변인들을 산출하여 그 변인들에 대한 특성을 파악하고 지도자와 선수들에게 자료를 제공함으로써 효과적인 지도 방법 및 원리를 제공하는데 목적을 두었다. 그 결과 클럽헤드의 궤도는 아웃사이드에서 인사이드의 형태로 나타나 클럽헤드의 궤적이 이상적인 패이드 샷에 영향을 미치는 것으로 판단된다. 신체중심은 후방으로의 움직임이 나타날 때 실패의 가능성이 높은 것으로 나타나 전방으로의 중심이동이 성공요인에 긍정적인 영향을 미치는 것으로 판단된다. 코킹은 임팩트 후 자연스럽게 팔로스로우를 하여 손목을 풀어 주었으며 움직임의 순서에서 어깨 동작이 먼저 이루어지고 허리가 따라가는 형태로 나타났다. 고관절 각속도는 지연히팅으로 인한 자연스러운 페이드샷이 이루어지는 형태와 일치되었으며 클럽헤드의 속도 또한 임팩트시 코킹이 풀리면서 빠른 것으로 나타났다.

• 한국콘텐츠학회논문지
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• 제8권9호
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• pp.66-73
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• 2008

본 논문은 변화하는 방송환경 속에서 텔레비전 영상제작기법은 시청률과 어떤 상관관계를 가지고 있는지를 알아보고자 하는 목적으로 출발하였다. 그 중에서 특히 가장 높은 시청률을 기록하고 있는 텔레비전 장르인 드라마에서의 영상제작기법과 시청률의 상관관계를 분석하였다. 본 연구를 위하여 TNS미디어 코리아의 2007년 시청률 톱 100 자료를 바탕으로 사극과 폭력적인 드라마를 제외하고, 홈드라마 중에서 6편을 표본으로 선정하였다. 영상분석을 위해서 방송사 홈페이지의 드라마 다시보기와 대본보기를 통해 영상의 화면의 크기와, 카메라워크를 분석하고, 샷의 평균지속시간, 장면의 평균지속시간 등을 산출하였다. 이들 영상분석 자료를 대상으로 상관분석을 실시한 결과, <시청률>은 <복합적 카메라워크>와 <샷의 평균 지속시간> 과 부적인 상관관계가 있으며, 그 관계는 매우 밀접한 것으로 드러났다. 그리고 여타의 다른 변인들과는 상관관계가 없음이 밝혀졌다. 이러한 결과는 텔레비전 드라마의 시청률을 높이기 위해서는 2가지 이상의 카메라워크가 결합된 복합적 카메라워크를 줄이고, 샷의 지속시간을 짧게 제작하는 것이 바람직하다는 것을 말해준다.

• 한국운동역학회지
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• 제13권2호
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• pp.13-28
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• 2003

The purpose of this study was to analyze the kinematic characteristics of Ice hockey slap shot. The subjects of this study were four professional ice hockey players. The reflective markers were attached on the anatomical boundary line of body and the subjects were asked to perform the shot. Ariel Performance Analysis System was used to capture and digitize the shooting image, the data were analyzed by LabView 6i. The results were as fellows. 1. The period of the back swing phase was $0.542{\pm}0.062sec$, the down swing phase was $0.28{\pm}0.056sec$ and the total swing time was $0.825{\pm}0.017sec$ 2. The maximum linear velocity of the stick blade for x direction was shown after 7% of impact, for y, z direction were shown before 2%, 8% of Impact. 3. The maximum velocity of each segment for the left arm was $2.35{\pm}0.05m/s$ in the upper arm, $3.56{\pm}0.34m/s$ in the forearm, $4.75{\pm}0.67m/s$ in the hand. 4. The maximum velocity of each segment for the right arm was $4.67{\pm}0.43m/s$ in the upper arm, $7.22{\pm}0.69m/s$ in the forearm, $9.42{\pm}0.89m/s$ in the hand. 5. The angle of left elbow was generally flexed from the ready stance to the impact and was $82.26{\pm}3.45^{\circ}$ the moment of Impact. 6. The angle of the left shoulder was increased ut the down swing phase and was $78.74{\pm}4.78^{\circ}$ on the moment of impact. 7. The angle of the right shoulder was decreased in the down swing phase and increased before the impact. and the angle was $51.28{\pm}3.54^{\circ}$ on the moment of impact.