초고층 철골대각가새골조의 내진성능평가

김선웅,Kim, Seon-Woong 한국전산구조공학회 2011 한국전산구조공학회논문집 Vol.24 No.3

본 논문은 강풍대이면서 약진대에 위치하는 내풍설계된 초고층건물이 경험할 수 있는 잠재적 지진에 대한 내진성능평가를 통해서 탄성내진설계의 가능성을 검토하는 것이다. 최근에 가장 각광받고 있는 구조시스템인 초고층 철골대각가새골조를 내풍설계하고, 내풍설계과정에서 상당한 시스템초과강도가 유입됨을 확인하였다. 초고층 철골대각가새골조에 대하여 다양한 지반조건에 따른 응답스펙트럼해석과 내진성능평가를 수행하였다. 우리나라와 같이 강풍대에 위치하면서 약진대에 속하는 환경하에서 세장비 5.2이상의 초고층 철골대각가새골조는 500년 재현주기 지진동에 대해서는 탄성저항할 수 있음을 보여주었고, 세장비 6.9의 초고층 철골대각가새골조는 2400년 재현주기 지진동에 대해서도 탄성설계가 가능함을 확인하였다. 500년 재현주기 지진동에 대해서 초고층 철골대각가새골조는 부재수준에서 지반조건에 관계없이, 2400년 재현주기 지진동에 대해서도 $S_E$지반을 제외하고는 세장비 5.2이상의 모델에서 모두 "즉시거주" 수준을 나타내었다. 시스템수준에서 초고층 철골대각가새골조는 500년 재현주기 지진동에 대해서 세장비 5.2이상의 모델은 $S_A$와 $S_B$지반에서는 즉시거주, $S_C{\sim}S_E$ 지반에서는 "인명안전" 수준을 나타내었다. 2400년 재현주기 지진동에 대해서는 500년 재현주기보다 한 단계 낮은 내진성능수준을 보여주었다. This paper is to investigate the possibility of the elastic seismic design for highrise buildings through seismic performance evaluation for potential earthquakes that wind-designed highrise buildings located in strong wind zone and low seismicity can be experienced. Highrise steel diagrid frames which is the most loved structural system in recent years were wind-designed and the substantial system overstrength due to wind design procedure is verified, For the highrise steel diagrid frames, the response spectrum analysis and the seismic performance evaluation by various soil sites were conducted. It was showed that highrise steel diagrid frames with slenderness of greater than 5.2 under strong wind and low seismic zones such as Korea peninsula can resist elastically for the 500 year return period earthquake and have the possibility of seismic design for the 2400 year return period earthquake. In the member level, highrise steel diagrid frames with slenderness of greater than 5.2 all presented the immediate occupancy level regardless of soil sites for the 500 year return earthquake and excluding the $S_E$ soil site for the even 2400 year return period earthquake. In the system level, highrise steel diagrid frames with slenderness of greater than 5.2 showed the immediate occupancy level for $S_A$ and $S_B$ soil sites and the life safety for $S_C$ to $S_E$ soil site in the 500 year return period. The seismic performance level of highrise steel diagrid frames for the 2400 year return period earthquake displayed one step lower than the 500 year return period earthquake.

웨이브렛 변환을 이용한 DCT 적응 서브 밴드 필터 알고리즘

김선웅,김성환,Kim, Seon-Woong,Kim, Sung-Hwan 한국음향학회 1996 韓國音響學會誌 Vol.15 No.1

적응 LMS 알고리즘은 그 구조적 간결성으로 인해 많은 방면엣 활용되어 오고 있다. 이 논문에서는 입력 신호를 임의의 대역폭을 가진 서브밴드로 분할하여 처리한다. 각 서브밴드엣 신호의 동적범위가 줄어들 수 있으며 각 대역에서 독립적으로 수행되는 적응 필터링은 이로 인해 기존의 LMS 필터링보다 빠른 수렴 속도를 얻을 수 있다. 각 대역에서의 적응 필터링은 DCT 변환을 잉용하여 입력 신호의 백색화후 수행되며 이에 따라 탭입력 공분산 행렬의 고유치 분포율이 작아져 빠른 수렴 속도를 얻게 된다. 최종적으로, 각 서브밴드에서 필터링된 출력신호는 전 대역에 걸쳐 주파수 성분을 가지도록 합성 과정을 거쳐야 한다. 이 과정에서 웨이브렛 필터 뱅크는 스펙트럼 상에 간섭이 없는 완벽한 신호 복원을 가능하게 한다. 전산 모의 실험에서 가산성 백색 잡음이 가해진 음성신호 입력의 경우 제안된 알고리즘은 신호대 잡음비가 높아질수록 기존의 정규화 LMS(normalized LMS)보다 우수한 성능을 보였다. Adaptive LMS algorithm has been used in many application areas due to its low complexity. In this paper input signal is transformed into the subbands with arbitrary bandwidth. In each subbands the dynamic range can be reduced, so that the independent filtering in each subbands has faster convergence rate than the full band system. The DCT transform domain LMS adaptive filtering has the whitening effect of input signal at each bands. This leads the convergence rate to very high speed owing to the decrease of eigen value spread Finally, the filtered signals in each subbands are synthesized for the output signal to have full frequency components. In this procedure wavelet filter bank guarantees the perfect reconstruction of signal without any interspectra interference. In simulation for the case of speech signal added additive white gaussian noise, the suggested algorithm shows better performance than that of conventional NLMS algorithm at high SNR.

초고층 건물의 방폭 및 연쇄붕괴방지설계법의 소개

김선웅,Kim, Seon-Woong 한국공간구조학회 2011 한국공간구조학회지 Vol.11 No.4

발효콩 유지의 3T3-L1 지방전구세포와 고지방식이를 급여한 C57BL/6J 생쥐에 대한 항비만 효과

김선웅(Seon-Woong Kim),김남석(Nam-Seok Kim),오미진(Mi-Jin Oh),김하림(Ha-Rim Kim),김민선(Min-Sun Kim),이다영(Da-Young Lee),윤석후(Suk-Hoo Yoon),정문웅(Mun-Yhung Jung),김훈중(Hun-Jung Kim),이창현(Chang-Hyun Lee),오찬호(Chan-Ho Oh) 한국식품영양과학회 2017 한국식품영양과학회지 Vol.46 No.3

본 연구에서는 발효콩 유지가 비만 억제 및 예방, 3T3-L1 지방전구세포의 성장 및 분화 억제 효과를 관찰하기 위해 실험을 실시하였다. 3T3-L1 지방전구세포에 발효콩 유지를 처리하여 세포생존율을 측정한 결과, NF군 100 μg/mL에서 3T3-L1 지방전구세포의 생존율을 유의적으로 감소시켜 세포독성이 나타났다. 분화를 유도한 다음 세포 내 triglyceride 함량을 측정한 결과, 비발효콩 유지(NF) 처리군보다 발효콩 유지처리군에서 triglyceride 함량 저해 효과가 높게 나타났으며, 특히 BS, LBA, BLO군 순으로 높게 나타났다. 또한, BS군, LBA군, BLO군 순으로 지방세포분화 관련 유전자인 PPARγ의 mRNA 발현을 농도 의존적으로 감소시켰으며, PPARγ 유전자와 상관관계에 있는 C/EBPα 유전자도 농도 의존적으로 감소시켰다. 그리고 adiponectin 유전자 발현은 농도 의존적으로 증가시켰다. 고지방식이로 비만을 유도한 C57BL/6J 생쥐를 이용하여 항비만 활성을 관찰한 결과, 총 체중증가량은 대조군에 비해 4주째에 감소하는 경향이 나타났다. 혈액 내 지질농도를 측정한 결과 중성지방, 총콜레스테롤, LDL-콜레스테롤 함량은 LBA, BLO군에서 유의적으로 낮게 나타났으며(P<0.05), HDL-콜레스테롤 함량은 대조군보다 증가하였으나 유의적인 차이는 나타나지 않았다. 동맥경화 지수인 AI(atherogenic index)는 대조군보다 감소시키는 경향을 보였다. 비만관련 호르몬인 adiponectin의 농도는 SO, BS, LBA, BLO군에서 유의적으로 증가하였고(P<0.05), insulin 농도는 유의적으로 감소하였다(P<0.05). Leptin은 대조군보다 감소하였으나 유의적인 차이는 나타나지 않았다. 따라서 이러한 결과를 종합하여 볼 때 발효콩 유지가 3T3-L1 지방전구세포의 mRNA 단계에서부터 지방분화를 억제하여 항비만 활성을 가지고 있는 것으로 추정되고, 고지방식이로 비만이 유도된 C57BL/6J 생쥐에서 총체중을 감소시키고, 혈액 내 지질농도인 triglyceride와 총콜레스테롤, LDL-콜레스테롤 및 HDL-콜레스테롤과 비만관련 호르몬인 adiponectin, insulin, leptin을 조절하여 항비만 활성을 가지고 있는 것으로 확인되었다. 이 결과로 발효콩 유지가 항비만 생리활성을 나타내는 새로운 식품 소재로서 이를 활용한 기능성 식품 개발의 가능성이 있다고 생각된다. This study investigated the manufacturing of fermented soybean oil using a fermenting strain commonly processed for soybeans [Bacillus amyloliquefaciens (BA), Bacillus subtilis (BS), Lactobacillus acidophilus (LBA), and B. subtilis+L. acidophilus (BLO)] and evaluated its anti-obesity activities. Cytotoxicity of four kinds of fermented soybean oils was not observed in 3T3-L1 preadipocytes at 10 and 50 μg/mL. Triglyceride content was reduced by 20.6% in the BLO group at a treatment concentration of 50 μg/mL. The simultaneous treatment of fermented soybean oil and differentiation induction medium decreased PPARγ and C/EBPα gene expression at a concentration of 50μg/mL and blocked adipocyte differentiation by increasing adiponectin gene expression. The inhibitory effect of adipocyte differentiation was greatest in the BLO group. C57BL/6J mice were examined for 4 weeks after being separated into seven groups [normal diet group (N), high fat diet group (C), group fed high fat diet combined with regular soybean oil (SO), group fed non-fermented soybean oil (NF), and groups fed high fat diet combined with 5% fermented soybean oil (BA, BS, LBA, and BLO)] to identify the effects of soybean oil on body weight, serum lipid, adiponectin, insulin, and leptin levels in mice with high fat diet-induced obesity. The body weight and serum lipid level of the C group increased drastically compared to those of the N group. In contrast, the group fed a diet combined with fermented soybean oil showed decreases in weight, serum total cholesterol, LDL-cholesterol, and triglyceride levels compared to those of the C group. Moreover, soybean oil was found to be effective in the BLO group. In conclusion, fermented soybean oil has positive effects in prohibiting adipocyte differentiation increased by high fat diet and improving serum lipid composition. Therefore, fermented soybean oil can be used as a functional food material with anti-obesity activity.

수입 펄프 가격의 시계열적 특성 분석

김선웅(Seon-Woong Kim),이석일(Seok-Il Lee),윤병삼(Byung-Sam Yoon) 한국펄프·종이공학회 2021 펄프.종이기술 Vol.53 No.6

초고층 철골중심가새골조의 내진성능평가

김선웅(Kim Seon-Woong) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.7

This paper aims to investigate the possibility of elastic or limited ductility seismic designs for highrise buildings through modal response spectrum analysis using elastic seismic design spectrum of various soil sites per KBC2009 as input ground motions for the potential earthquakes which wind-designed highrise steel concentrically braced frames can experience during the life cycle of highrise buildings under strong wind zone and low seismicity such as Korean peninsula. From wind design procedures, it was verified that substantial system overstrength to act as the potential factor increasing the possibility of elastic seismic design for highrise steel concentrically braced frames is flowed in. All analytical models except slenderness of 4 in SE soil site were able to resist elastically against SLE, while it was found that the models having slenderness greater than 6 in SA soil site and slenderness of 7 in SB soil site can behave elastically against MCE. Flange columns, which are the force-controlled members, showed the response of immediate occupancy level against SLE in all soil sites and MCE in SA and SB, when the slenderness is higher than 4. Deformation-controlled action of diagonals with slenderness above 4 were forecasted immediate occupancy level in all soil sites for SLE and immediate occupancy and life safety levels in most of the soil sites for even MCE. Moreover, high-rise steel concentrically braced frames with slenderness of above 4 were showed the performance level of immediate occupancy for SLE in all soil sites and ,for even MCE, models having slenderness of greater than 4 in SA soil site and slenderness of 7 in SB soil site were also presented immediate occupancy level according to seismic performance evaluation standard of system level. Finally, it was recognized that the elastic design of wind-designed highrise steel concentrically braced frames, that is, seismic design using the response modification factor of 1 is available in all soil sites for SLE and SA and SB soil sites for MCE under strong wind zone and low seismicity.

Reed-Solomon Codes 구현을 위한 오류값 도출

김선웅(Seon-Woong Kim) 산업기술교육훈련학회 2017 산업기술연구논문지 (JITR) Vol.22 No.3

This paper deals with the channel coding, which is adopted as an essential element for stable data transmission and storage, ranging from digital information transmission including high-speed Internet and digital broadcasting to massive data storage. Reed-Solomon coding is a representative block coding. It is used together with the interleaver because of its robustness against cohesive errors, and is adopted as a major coding scheme against the noises and channel distortions introduced into transmission channel. RS (204,188) encoding is adopted in the MPEG2 transport stream to obtain the coding gain of about 2dB. This reduces the requirement for the transmission power per bit to achieve the reference transmission error rate. In addition to the improvement of transmission data reliability, it also has the effect of enabling various transmission services due to the high transmission reliability. Since the decoder is located mostly at the end terminal equipment, it is important to design it to have advantages in implementation cost. For this purpose, we propose a simple implementation scheme for the derivative of polynomial on finite field and gave its verification through the simulation of RS(204,188) encoding and decoding.

채널 추정기를 위한 칼만필터의 파라미터 설정치 최적화에 대한 연구

김선웅(Seon-Woong Kim) 산업기술교육훈련학회 2017 산업기술연구논문지 (JITR) Vol.22 No.1

This paper deals with the initial value problem of Kalman filter in environment of time varying noise variance. Due to its rapid convergence rate and low steady state error properties, Kalman Filter is widely used as a fast acquisition algorithm in high speed channel estimation. But the wrong initial values of measurement noise variance R(0) and state prediction error variance Q(0) degrade the performance especially in time varying noise environment. In order to overcome this weakness there need to modify these variances to proper values expected with time elapse and we introduced a empirical study on an algorithm to realize that modification process. The simulation result shows the estimated measurement noise variance follows the abrupt change in variance of R(n) within 250 symbol times and the estimation error for R(n) converges very small amounts.

비정형 철골조 초고층건물의 경제성 및 내진 성능평가

김선웅(Seon-woong Kim) 한국강구조학회 2016 韓國鋼構造學會誌 Vol.28 No.3

시계열 모형을 이용한 활엽수 표백 크라프트 펄프 수입가격 예측

김선웅(Seon-Woong Kim),윤병삼(Byung-Sam Yoon),박종섭(Jong-Sup Park) 한국펄프·종이공학회 2020 펄프.종이기술 Vol.52 No.4