스월유동장의 화염전파에 미치는 난류특성의 영향에 관한 연구

이상준,이종태,이성열,Lee, Sang-Jun,Lee, Jong-Tae,Lee, Seong-Yeol 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.10

Flow velocity was measured using a hot wire anemometer. Turbulence intensity was in proportion to mean flow velocity regardless of swirl velocity. And integral length scale has proportional relation with swirl velocity regardless of measurement position. Flame speed calculated by radius of visualized flame was increased and then decreased according to lapse of time from spark. Maximum flame speed was increased according to increase of turbulence intensity. Burning speed and flame transport effect increased with increase of swirl velocity, but ratio of burning speed to flame speed decreased with increased of swirl velocity. Mass fraction burned versus volume fraction burned was increased in proportion to the increase of turbulence intensity, caused by increase of combustion promotion effect according to increase of turbulence intensity and scale.

스월유동장에 있어서 연소속도에 미치는 난류특성의 영향에 관한 연구

이상준,이종태,이성열,Lee, Sang Jun,Lee, Jong-Tai,Lee, Song-Yol 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.1

Flow velocity was measured by, use of hot wire anemometer. Turbulence intensity was in proportion to mean flow velocity regardless of swirl velocity. And integral length scale has proportional relation with swirl velocity regardless of measurement position. Turbulent burning speed during flame propagation which was determined by flame photograph and gas pressure of combustion chamber was increased with the lapse of time from spark and was decreased a little at later combustion period. Because of combustion promotion effect, turbulent burning speed was increased according to increase of turbulence intensity. Burning speed ratio i.e. ratio of turbulent burning speed ($S_BT$) to laminar burning speed ($S_BL$) was found out by use of turbulence intensity u' and integral length scale $l_x$ , $\delta_L$ is width of preheat zone in laminar flame.

기억성 경도인지장애 및 알츠하이머 치매 환자에서 해마, 편도체, 뇌들보, 내후각 피질과 혈중 지질, 호모시스테인, 엽산 농도와의 연관성

이상준,김태형,허량,최승은,이봉주,김경미,이정구,김홍대,문치웅,김영훈,Lee, Sang Jun,Kim, Tae Hyung,Huh, Lyang,Choi, Seung Eun,Lee, Bong Ju,Kim, Gyung Mee,Lee, Jung Goo,Kim, Hong Dae,Mun, Chi Woong,Kim, Young Hoon 대한생물정신의학회 2015 생물정신의학 Vol.22 No.4

Objectives In this study, the authors evaluated the correlation between levels of serum lipid, homocysteine, and folate with volumes of hippocampus, amygdala, corpus callosum, and in patients with amnestic mild cognitive impairment (aMCI) or Alzheimer's disease (AD) type. Methods The study recruited patients who visited the dementia clinic of Haeundae Paik Hospital in Korea between March 2010 and June 2014. Among those, patients who had taken the neurocognitive test, brain magnetic resonance imaing, tests for serum lipid, homocysteine, folate, and apolipoprotein E (APOE) genotyping and diagnosed with aMCI or AD were included for analysis. Bilateral hippocampus, entorhinal cortex, amygdala and corpus callosum were selected for region of interest (ROI). The cross-sectional relationships between serum lipid, homocysteine, folate and ROI were assessed by partial correlation analysis and multiple linear regression analysis. Results In patients with aMCI, old age (> 80) and APOE ${\varepsilon}4$ carrier were associated with AD [odds ration (OR) : 12.80 ; 95% confidence interval (CI) : 2.25-72.98 and OR : 4.48 ; 95% CI : 1.58-12.67, respectively]. In patients with aMCI or AD, volumes and thickness of ROI were inversely correlated with levels of serum lipid and homocysteine. In multiple linear regression analyses, higher total cholesterol level was related to lower left, right hippocampus volume and left amygdala volume ; higher low-density lipoprotein cholesterol was related to lower right entorhinal cortex thickness ; higher homocysteine level was related to lower corpus callosum volume. Conclusions Higher serum lipid and homocysteine levels are associated with decreased volume of hippocampus, amygdala, corpus callosum and entorhinal cortex thickness in patients with aMCI or AD. These findings suggest that serum lipid and homocysteine levels are associated with AD as a modifiable risk factor.

생체 인식 시스템을 위한 심전도 개인인식 알고리즘 개발

이상준,김진권,이영범,이명호,Lee, Sang-Joon,Kim, Jin-Kwon,Lee, Young-Bum,Lee, Myoung-Ho 대한의용생체공학회 2010 의공학회지 Vol.31 No.5

This paper is about the personal identification algorithm using an ECG that has been studied by a few researchers recently. Previously published algorithm can be classified as two methods. One is the method that analyzes ECG features and the other is the morphological analysis of ECG. The main characteristic of proposed algorithm uses together two methods. The algorithm consists of training and testing procedures. In training procedure, the features of all recognition objects' ECG were extracted and the PCA was performed for morphological analysis of ECG. In testing procedure, 6 candidate ECG's were chosen by morphological analysis and then the analysis of features among candidate ECG's was performed for final recognition. We choose 18 ECG files from MIT-BIH Normal Sinus Rhythm Database for estimating algorithm performance. The algorithm extracts 100 heartbeats from each ECG file, and use 40 heartbeats for training and 60 heartbeats for testing. The proposed algorithm shows clearly superior performance in all ECG data, amounting to 90.96% heartbeat recognition rate and 100% ECG recognition rate.

과학기술위성3호 소형영상분광기 발사모델 환경시험 결과

이상준,김정현,이준호,이치원,장태성,강경인,Lee, Sang-Jun,Kim, Jung-Hyun,Lee, Jun-Ho,Lee, Chi-Won,Jang, Tae-Sung,Kang, Kyung-In 한국광학회 2011 한국광학회지 Vol.22 No.4

과학기술위성3호 부탑재체인 소형영상분광기 COMIS(Compact Imaging Spectrometer)는 400 - 1050 nm의 관측 대역에서 분광 관측을 수행하는 영상 분광기이다. COMIS는 2012년 고도 700 km의 원 궤도에서 발사 된 후 27 m의 공간분해능과 2 - 15 nm의 파장 분해능을 갖도록 설계되었다. 본 논문에서는 COMIS 비행 모델의 환경시험 수행결과를 기술한다. 발사 환경인 진동 가진에 의한 영상분광기의 광학적, 구조적인 변화 여부와 우주환경인 열.진공 상태에서의 기능 시험을 수행하여 안정성 및 신뢰성을 검증 받았다. 우주공간에서의 환경으로 일컬어지는 고진공($10^{-5}$ torr이하)과 $-30^{\circ}C{\sim}35^{\circ}C$의 고온 및 저온의 열적 변화 상태를 모사하는 시험에서 정상적인 기능을 보였고, 10 grms의 랜덤 진동 가진 전.후의 고유 진동수는 1% 이내의 변화량을 보였다. 환경시험 전 후로 영상분광기의 변조전달함수(MTF, Modulation Transfer Function) 측정을 하여 광학 성능이 유지됨을 확인하였다. 환경시험을 마친 영상분광기는 현재 과학기술위성3호 본체와의 조립을 진행 중에 있으며 2012년 발사 예정에 있다. A compact imaging spectrometer (COMIS) was developed for a microsatellite STSAT-3. The satellite is now rescheduled to be launched into a low sun-synchronous Earth orbit (~700 km) by the end of 2012. Its main operational goal is the imaging of the Earth's surface and atmosphere with ground sampling distance of 27 m and 2 - 15 nm spectral resolution over visible and near infrared spectrum (0.4 - 1.05 ${\mu}m$). A flight model of COMIS was developed following an engineering model that had successfully demonstrated hyperspectral imaging capability and structural rigidity. In this paper we report the environmental test results of the flight model. The mechanical stiffness of the model was confirmed by a small shift of the natural frequency i.e., < 1% over 10 gRMS random vibration test. Electrical functions of the model were also tested without showing any anomalies during and after vacuum thermal cycling test with < $10^{-5}$ torr and $-30^{\circ}C\;-\;35^{\circ}C$. The imaging capability of the model, represented by a modulation transfer function (MTF) value at the Nyquist frequency, was also kept unvaried after all those environmental tests.

소프트웨어는 인공지능을 목표로

이상준,Lee, Sang-Jun 한국IT전문가협회 1987 소프트웨어세계 Vol.1 No.-

Stereoscopic PIV 기법을 이용한 선박용 프로펠러 후류의 3차원 속도장 측정

이상준,백부근,윤정환,Lee, Sang-Joon,Paik, Nu-Geun,Yoon, Jong-Hwan 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.12

A stereoscopic PIV(Particle Image Velocimetry) technique was employed to measure the 3 dimensional flow structure of turbulent wake behind a marine propeller with 5 blades. The out-of-plane velocity component was determined using two CCD cameras with the angular displacement configuration. Four hundred instantaneous velocity fields were measured for each of four different blade phases and ensemble averaged to investigate the spatial evolution of the propeller wake in the near-wake region from the trailing edge to one propeller diameter(D) downstream. The phase-averaged velocity fields show the potential wake and the viscous wake developed along the blade surfaces. Tip vortices were generated periodically and the slipstream contraction occurs in the near-wake region. The out-of-plane velocity component and strain rate have large values at the locations of tip and trailing vortices. As the flow goes downstream, the turbulence intensity, the strength of tip vortices and the magnitude of out-of-plane velocity component at trailing vortices are decreased due to viscous dissipation, turbulence diffusion and blade-to-blade interaction.

병저항성 육종을 위한 고추 유전자원의 저항성 평가

이상준,김병섭,Lee, Sang-Jun,Kim, Byung-Sup 한국원예학회 2012 원예과학기술지 Vol.30 No.2

본 시험은 고추의 육종을 위한 병 저항성 고추를 선발하고자 하였다. 국내에서 시판중인 역병 저항성 품종인 PR계통 21품종, 미국에서 도입해온 36품종과 역병감수성 품종인 '슈퍼마니따'를 사용하여 역병, 탄저병, 흰가루병의 병 저항성 검정을 수행하였다. $Phytophthora$ $capsici$에 의해 발병하는 고추역병의 유묘검정은 서로 다른 교배형(A1, A2, Sterile)을 가지는 3 균주를 사용하여 접종하였다. 그 결과 대부분의 PR계통 고추들은 각각의 교배형에 대하여 저항성 또는 중도저항성을 나타내는 것으로 조사되었다. '역강홍장군'은 서로 다른 교배형의 세 가지 균주에 대하여 저항성을 나타냈으며, 'PR-다따'와 'PR-마니따'는 각각의 교배형에 저항성 또는 중도저항성을 보였다. 외래종의 경우, 'NuMex J.E.Parker', 'Omni Color'과 'SCM-334' 품종은 세 가지 균주에 저항성을 나타냈고, 'Sweet Banana'와 'Tabasco'를 포함한 몇몇 품종들은 각각의 균주에 중도저항성을 나타냈다. 흰가루병에 대하여 'Orange Habanero', 'black Cuban'은 저항성을 나타냈으며, '슈퍼마니따'와 'PR 금동'은 중도저항성을 나타냈다. 'Santa Fe Grnade', 'NuMex Pinata' 품종은 흰가루병에 매우 심한 감수성인 것으로 조사되었다. 탄저병의 경우, 'Aji Limon'과 'C. baccatum var. pendelum 3-4' 품종은 저항성인 것으로 조사되었다. 'Pobalno', 'Omni Color', 'Negro', 'Mesilla', 'Mulato', 'Bhut Jolokia', 'Big Dipper', 'Black Cuban', 'NuMex Pinata'와 'NuMex Big Jim'은 중도저항성을 나타내는 것으로 조사되었다. '태산'을 제외한 대부분의 PR계통들은 탄저병에 대하여 감수성 내지 심한 감수성인 것으로 확인되었다. 본 연구에서 확인된 저항성 개체는 이후에 고추 병저항성 육종에 유용한 유전자원으로 이용될 수 있다. For initiation of resistance breeding program of the red pepper, 21 PR ($Phytophthora$ resistance) cultivars, 36 cultivars collected from USA and 'Supermanitta' which is a susceptible cultivar against phytophthora blight were assayed against phytophthora blight, powdery mildew, and anthracnose. For seedling assay of phytophthora blight, three different mating type strains of $Phytophthora$ $capsici$ were used (A1, A2, Sterile). The result showed that most of the pepper of PR cultivars were resistance or moderately resistance at each mating type. 'Yeokganghongjanggun' was resistant to all three $P.$ $capsici$ strains and 'PR-Datta' and 'PR-Manitta' were resistant or moderately resistant at each type. In case of the collected cultivars, 'NuMex J.E.Parker', 'Omni Color', and 'SCM334' were resistant to all the three types and some cultivars including 'Sweet Banana' and 'Tabasco' were moderately resistant to each type fungi. 'Orange Habanero' and 'Black Cuban' were resistant to powdery mildew and 'Supermanitta' and 'PR Keumdong' were moderately resistant, while 'Santa Fe Grande', 'NuMex Pinata' and 'Puya' were very susceptible. In the case of anthracnose, 'Aji Limon' and 'Capsicum baccatum var. pendulum 3-4' were resistant and 'Pobalno', 'Omni Color', 'Negro', 'Mesilla', 'Mulato', 'Bhut Jolokia', 'Big Dipper', 'Black Cuban', 'NuMex Pinata', and 'NuMex Big Jim' were moderately resistant. The most PR cultivars except 'Taesan' were susceptible or very susceptible. These resistant individuals identified through this experiment can be used as sources of resistance to pepper pathogens in the future breeding programs.

모발건조기에 대한 발화 연구

이상준,주희선,안성일,Lee, Sang-Jun,Ju, Hui-Seon,An, Seong-Il 한국화재조사학회 2003 한국화재조사학회 논문지 Vol.2 No.1

가연성 액체에 의한 바닥재 소훼흔 연구

이상준,황태연,안성일,박한석,Lee, Sang-Jun,Hwang, Tae-Yeon,An, Seong-Il,Park, Han-Seok 한국화재조사학회 2005 한국화재조사학회 논문지 Vol.6 No.1

연소의 특성으로 대부분의 화재현장에서 상단 부위에 존재하는 가연물은 대류현상 등에 의해 소실되어 연소 후 나타나는 흔적을 식별하기 곤란하며, 바닥 부분의 바닥재 등의 경우는 화재발생 이후 상승 연소하는 화염에 의해 소훼된 가연물 등이 소락하여 질식소화되므로 비교적 초기의 연소패턴을 유지하고 있는 점을 착안하여, 바닥에서 나타나는 흔적 등을 비교 검토하여 연소의 촉매제로 사용된 물질의 종류를 추론함으로써 초기에 진행되는 수사에 많은 도움을 줄 수 있다.