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.

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.

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.

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.

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.

북한 지역개발 방향에 대한 연구

이상준,Lee, Sang-Jun 한국토지주택공사 토지주택연구원 2015 LHI journal of land, housing, and urban affairs Vol.6 No.2

남북간의 극심한 개발격차를 줄이기 위해서 우리는 중단기에 북한경제회생의 기반을 마련하는데 초점을 맞출 필요가 있다. 이러한 측면에서 식량부족과 에너지부족문제의 해결, 재해복구 등을 통한 경제회생의 기반 마련이 중요하다. 장기적으로는 남한지역과의 지역개발격차를 축소함과 동시에 북한지역내 균형발전을 도모하는 것이 필요하다. 향후 북한의 지역개발은 북한이 갖고 있는 정책과 우리의 정책 그리고 중국 등 주변국의 정책동향을 종합적으로 고려해서 추진할 필요가 있을 것이다. 북한의 지역개발을 위한 우리와 북한 그리고 국제사회의 협력은 다음과 같은 방향으로 추진될 필요가 있다. 먼저 한반도의 장기적인 발전측면에서 북한 지역발전의 성장동력을 육성 한 후 그 효과를 주변에 전파하는 것이 필요하다. 장기적으로 북한지역 발전의 중요한 동력이 될 첨단산업과 고부가 관광서비스산업(MICE), 물류산업 등을 육성하는 것이 필요하다. 북한의 지역별 여건과 지역발전의 효율성을 고려한 맞춤형 발전전략을 추진하는 것이 필요하다. 지역별 특성을 고려하여 제조업중심형, 관광서비스업중심형 발전 전략을 추진하는 것이 필요하다. 북한의 지역개발이 체계적이고 지속가능한 방식으로 진행되기 위해서는 정부와 민간 그리고 국제사회의 지속가능한 협력체계를 구축하는 것이 필요하다. 정부나 국제금융기구차원의 인프라지원과 민간의 투자를 연계할 수 있는 방안이 이러한 측면에서 모색될 필요가 있을 것이다. 북한의 지역개발이 성공적으로 추진됨으로써 한반도 공동번영의 토대를 마련하기 위해서는 우리내부적인 정책준비가 필요하다. 이러한 측면에서 북한 지역개발사업에 대한 우리 정부지원의 원칙과 기준을 분명하게 설정할 필요가 있다. 우리의 대북정책에 공간개발 마인드를 접목하는 것이 필요하다. 드레스덴 선언의 실현을 위한 세부 실천방안을 공간적 개발차원에서 검토하는 것이 필요하다. 북한 주민들의 민생인프라 개선과 지역개발을 접목하는 시각이 고려될 필요가 있다. In order to minimize regional disparities between the North and the South, it is very important to reduce shortages of food and energy in North Korea in the short and mid-term. In the long term, it is important to reduce not only regional disparities between two Koreas but also regional disparities in North Korea. It is important to consider national policies of the North, the South and other countries in Northeast Asia in the process of building regional development policies for North Korea because the future of regional development in North Korea depends on policies of stakeholder in Northeast Asia. This study suggest some policy directions for regional development in North Korea. At first, building new industries, such as hi-tech industries and MICE, is important for regional development potentials in North Korea. Also, we should take some special development strategies according to regional potentials in North Korea. For example, Nampo region should be specialized through hi-tech industries. Wonsan region should be specialized through MICE. Finally, this study suggests some policy issues to the South Korean government. Financial support from South Korean government about inter-Korean economic cooperation should have priorities on the regions where have potentials of hi-tech industries and MICE. Also, we should implement inter-Korean economic cooperation policies under consideration about spatial aspects.

하드웨어개발의 방향 - 복제ㆍ모방에서 창의자세로

이상준,Lee, Sang-Jun 한국과학기술단체총연합회 1984 과학과 기술 Vol.17 No.11

안와 및 안부속기 림프종 환자의 임상양상 및 예후인자의 분석

이상준,정재호,최희영,Sang Jun Lee,Jae Ho Jung,Hee Young Choi 대한안과학회 2013 대한안과학회지 Vol.54 No.1

Purpose: To study the clinical features, pathophysiologic and radiologic characteristics, and prognostic factors in patients with orbital and adnexal lymphoma. Methods: The medical records of patients who were diagnosed with orbital and adnexal lymphoma, and patients who were treated and observed, were retrospectively reviewed. Information regarding age, sex, initial symptoms and signs when visiting the hospital, mass location and features, histology and staging, response to treatment and side effects, and prognosis were collected. Results: Fifty-four patients, with an equal number of men and women, were diagnosed with orbital and adnexal lymphoma. The average age was 50.9 years (14 to 82 years). The main symptom was orbital swelling, and the main site was conjunctiva. Histologically, Mucosa-Associated Lymphoid Tissue (MALT) lymphoma was the most observed. The major ocular complication was dry eye syndrome, which showed good response with ophthalmic treatment. Radiologic features did not have prognostic relevance. Conclusions: Most orbital and adnexal lymphomas were MALT lymphomas. Proper therapy according to stage can result in a good response and remission. In the present study, the therapy complications were well-controlled with medical treatment, and radiologic features of a mass could not be considered as a prognostic factor.

New SPICE Modeling for Bias-Dependent Gate-Drain Overlap Capacitance in RF MOSFETs

이상준,이성현,Lee, Sangjun,Lee, Seonghearn The Institute of Electronics and Information Engin 2015 전자공학회논문지 Vol.52 No.4

기존의 BSIM4 모델과 다이오드를 사용한 BSIM4 Macro 모델의 바이어스 종속 게이트-드레인 오버렙 캐패시턴스 $C_{gdo}$ 시뮬레이션의 부정확성에 대하여 자세히 분석하였다. 이러한 Macro 모델은 기존의 BSIM4 모델보다 더 정확하지만 선형영역에서 사용될 수 없음을 발견하였다. 기존 모델들의 부정확성을 제거하기 위해서 물리적인 바이어스 종속 $C_{gdo}$ 모델 방정식을 사용한 새로운 BSIM4 Macro 모델을 제안하였고 전체 바이어스 영역에서 유효함을 입증하였다. The inaccuracy of the bias-dependent gate-drain overlap capacitance $C_{gdo}$ simulation in original BSIM4 and BSIM4 macro model using a diode is analyzed in detail. It is found that the accuracy of the macro model is better than of the BSIM4. However, the macro model cannot be used in the linear region. In order to remove the inaccuracy of the conventional models, a new BSIM4 macro model with a physical bias-dependent $C_{gdo}$ equation is proposed and its accuracy is validated in the full bias range.

모발건조기에 대한 발화 연구

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