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제어기 공용화를 위한 LED 헤드램프 제어용 플랫폼 통합제어기 개발
박충섭(Choongseob Park),박동서(Dongseo Park),이은정(Eunjung Lee),김대현(Daehyun Kim),손유진(Yoojin Son),최윤석(Yunsuk Choi4),박상현(Sanghyun Park),문주환(Juwhan Moon),노태선(Taesun Rho),강소정(Sojeong Kang),이동주(Dongju Lee),김영수(You 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6
For the LED front lamp system, Universal Controller is gradually getting expanded in the world. For corresponding the technical trend and system optimization, we have approached in terms of vehicle level as well as LED load level. By understanding lamp system architecture and hardware functional distribution, we could make discrete LDMs into Universal LDM based on CAN communication. It enables us to control LED lamp very flexible and scalable with regardless of lamp variation depend on regional and specified option. Additionally, it is very compatible with future technologies such as pixel and matrix control in connection with autonomous driving.
An Analysis of Shortened Experiments for Environmental Chamber
Sanghyun Choi,Cheolho Bai,Mo Chung,Namho Kyong,Hangsuk Suh 대한설비공학회 2001 International Journal Of Air-Conditioning and Refr Vol.9 No.3
Environmental chamber (EC) is an experimental facility used to analyze the characteristics of thermal response of testing objects by the artificial control of weather conditions. The EC in KIER can simulate the weather conditions by the control of temperature, humidity, and, solar radiation. A two-storied testing building is located inside EC. For the exact thermal response analysis of testing building, monthly or yearly scheduled operations are necessary. Although this long term operation gives the exact experimental data, it requires a high operational cost, long duration, and lots of manpower. Therefore it is necessary to perform the shortened experiments without sacrificing the validity of the obtained results. Since the characteristics of thermal response from the shortened experiments are different from the full time results, the analytical method to analyze the thermal response from the shortened experiments to estimate a full times results is developed in this study. The thermal response of testing building is performed using commercial software TRNSYS.
Optimization of Herbicidin A Production in Submerged Culture of Streptomyces scopuliridis M40
( Sanghyun Ha ),( Keon Jin Lee ),( Sang Il Lee ),( Hyun Jung Gwak ),( Jong-hee Lee ),( Tae-woon Kim ),( Hak-jong Choi ),( Ja-young Jang ),( Jung-sub Choi ),( Chang-jin Kim ),( Jin-cheol Kim ),( Hyeong 한국미생물 · 생명공학회 2017 Journal of microbiology and biotechnology Vol.27 No.5
Herbicidin A is a potent herbicide against dicotyledonous plants as well as an antibiotic against phytopathogens. In this study, fermentation parameters for herbicidin A production in submerged culture of Streptomyces scopuliridis M40 were investigated. The herbicidin A concentration varied with the C/N ratio. High C/N ratios (>4) resulted in a herbicidin A production of more than 900 mg/l, whereas maximally 600 mg/l was obtained at ratios between 1 and 3.5. In 5-L batch fermentation, there was a positive correlation between the oxygen uptake rate (OUR) and herbicidin A production. Once the OUR increased, the substrate consumption rate increased, leading to an increase in volumetric productivity. Mechanical shear force affected the hyphal morphology and OUR. When the medium value of hyphal size ranged from 150 to 180 μm, high volumetric production of herbicidin A was obtained with OUR values >137 mg O<sub>2</sub>/l·h. The highest herbicidin A concentration of 956.6 mg/l was obtained at 500 rpm, and coincided with the highest relative abundance of hyphae of 100-200 μm length and the highest OUR during cultivation. Based on a constant impeller tip speed, which affects hyphal morphology, herbicidin A production was successfully scaled up from a 5-L jar to a 500-L pilot vessel.
Sea Clutter Covariance Matrix Estimation and Its Application to Whitening Filter
Sanghyun Choi,Hoongee Yang,Jimin Song,Hyeonmu Jeon,Jongmann Kim,Yongseek Chung 한국전자파학회JEES 2021 Journal of Electromagnetic Engineering and Science Vol.21 No.2
The accurate estimation of clutter covariance matrix (CCM) is essential in designing a radar detector/filter to suppress sea clutter. This estimation might not be easily accomplished because of the scarcity of valid training vectors adjacent to the range cell under test (CUT). We propose a new CCM estimation algorithm that is derived by modeling time-series clutter returns into a clutter Doppler spectrum in the frequency domain and exploiting mutual independence among spectral components. To justify its excellence over the conventional sample covariance matrix (SCM) algorithm, we design two filters—a maximum signal-to-interference-plus-noise ratio (SINR)-based filter and a whitening filter—that use the estimated CCMs and compare their performance in a numerically simulated sea clutter scenario. Comparisons are made by showing the eigenvector spectra of the estimated CCMs and the frequency responses and outputs of the filters. Moreover, SINRs at the target Doppler bin are examined and compared with a theoretical, analytically derived SINR.
Sanghyun Choi,Chang Soo Lee,Jaehoon Lim,Seung Joon Lee,Sung Don Yang 한국재난정보학회 2013 한국재난정보학회 논문집 Vol.9 No.2
철도의 고속화가 진행됨에 따라 보다 경제적인 고속선용 교량 시스템의 개발을 위한 연구가 활발히 진행되고 있다. 이 논문에서는 기존의 프리스트레싱기법에 새로운 방식으로 추가적인 프리스트레스를 도입할 수 있는 바이프리스트레싱기법을 이용한 신형식 거더를 소개하였다. 추가적인 인장력은 단면 상부에 설치된 강봉 사이에 쐐기형 핀바를 삽입하여 도입할 수 있다. 신형식 거더가 적용된 철도교량의 고속선 적용성은 동적해석을 통한 안정성 검토를 통하여 수행하였다. 동적안정성 검토는 30m, 35m 및 40m 경간의 교량시스템에 대한 KTX 이동하중해석을 통하여 수행하였다. 검토 결과 개발된 교량은 구조적 안정성, 주행 안전성, 승차감 확보를 위하여 검토되고 있는 제한값을 모두 만족하는 것으로 나타났다.
Sanghyun Choi,Soonjung Kwon 한국재난정보학회 2014 한국재난정보학회 논문집 Vol.10 No.2
선하역사는 역사 건물의 상부에 위치한 노반구조물을 통하여 열차 운행으로 인한 진동이 직접 역사 구조물로 전달되므로 소음·진동에 취약한 구조이다. 선하역사 내부의 소음은 주 로 구조물의 진동으로 인하여 발생하는 고체소음이므로 보다 효율적인 진동 저감 대책의 수립을 위해서는 역사의 구조 형식, 부재 및 재료 등의 구성 요소에 따른 구조적 거동 및 감쇠 특성의 파악이 중요하다. 이 논문에서는 선하역사와 인접 교량과의 접속부의 역학적 특성에 따른 진동 특성 변화에 대한 검토 결과를 제시하였다. 해석 대상 역사는 대천역이 며, ABAQUS로 유한요소해석을 수행하였다. 접속부 특성은 접속 교량이 있는 경우와 없는 경우, 그리고 있는 경우 라멘식과 받침형식으로 구분하여 검토를 수행하였다.
The changing epidemiology of herpes zoster over a decade in South Korea, 2006–2015
Choi, Jae-Ki,Park, Sun Hee,Park, Sanghyun,Cho, Sung-Yeon,Lee, Hyo-Jin,Kim, Si-Hyun,Choi, Su-Mi,Lee, Dong-Gun,Choi, Jung-Hyun,Yoo, Jin-Hong Elsevier Ltd. 2019 Vaccine Vol. No.
<P><B>Abstract</B></P> <P><B>Background</B></P> <P>In South Korea, the population is rapidly aging and the prevalence of comorbidities has increased. We investigated longitudinal changes in the herpes zoster (HZ) considering demographic changes and comorbidities in the era of universal single-dose varicella vaccination.</P> <P><B>Methods</B></P> <P>We used the population-based database of the National Health Insurance Service in South Korea, with approximately 50 million subscribers during 2006–2015. HZ cases were identified using ICD-10 codes and comorbid conditions were also collected. Incidence rates (IRs) and incidence rate ratios (IRRs) per year were calculated adjusting for age, sex, comorbidities and socioeconomic status, and the temporal trends were examined using segmented negative binomial regression analysis.</P> <P><B>Results</B></P> <P>Over a decade, the adjusted HZ IR increased significantly from 4.23 to 9.22 per 1000 person-years (adjusted IRR 1.05, 95% confidence interval [CI] 1.04–1.06). However, during 2012–2015, the increasing trends decelerated (adjusted IRR per year 1.01, 95% CI 0.98–1.04) and slope changes differed by age. There was a declining trend in children under 9 years, sustained increase in adults aged 30–39 years, and near-plateau in those aged 50–69 years. Nonetheless, the age distribution of HZ incidence did not change over a decade, with the peak in adults aged 60–79 years. HZ-associated hospitalization rates also increased, with a deceleration in the increasing trends during 2012–2015.</P> <P><B>Conclusions</B></P> <P>The HZ burden increased independently of demographic changes and prevalence of comorbidities. However, different trajectories by age group necessitate continuous HZ surveillance for better understanding of these changes, and to provide evidence for development of preventive strategies.</P>
Nondestructive damage detection in structures using changes in compliance
Choi, Sanghyun,Park, Sooyong,Stubbs, Norris Elsevier 2005 International journal of solids and structures Vol.42 No.15
<P><B>Abstract</B></P><P>A methodology to identify damage in a structure is presented in this paper. The method utilizes a new form of damage index based on the changes in the distribution of the compliance of the structure due to damage. The changes in the compliance distribution are obtained using the mode shapes of the pre-damaged and the post-damaged state of the structure. The validity of the method is demonstrated using numerically generated data from beam structures and experimental data from a free–free beam structure with inflicted damage. In the numerical and experimental examples, the damage identification performance of the proposed method is compared with that of the existing strain-energy-based method. The results of the numerical and experimental studies indicate that the proposed compliance-based damage index method can be used in damage identification of the structure.</P>