회원작품- 건축비평 유연한 경계의 낮은 집 - 카페 인더스하버

최정우,Choi, Jungwoo 대한건축사협회 2023 建築士 Vol.657 No.-

통근비용절감을 통한 서울근교도시 거주자의 주택구입능력 개선효과

최정우,백성준,이종훈,Choi, Jung-Woo,Baek, Sung-Joon,Lee, Jong-Hoon 한국주거학회 2012 한국주거학회 논문집 Vol.23 No.5

This study has analyzed the effect of the housing affordability improvement of the residents in the metropolitan areas, applying Transit Supportive Home Loan (TSHL) which extends the loan amount according to the transportation cost saving based on Location Efficiency Mortgage (LEM) System in the USA. The previous studies focused on introducing LEM system to Korea, whereas this study has analyzed TSHL effect for the first time, taking into account the situation in Korea. For analysis, The Transportation Savings (TS) is calculated and Housing Affordability Index (HAI) is drawn by applying increased TS and DTI (Debt to Income), so the improvements of housing purchasing ability is examined by HAI's improvement. As a result, transit commute 1 (having own car) and transit commute 2 (without having own cars) respectively produce the TS of monthly average 36 thousand won and 110 thousand won in comparison with car using commute. Each additional loan (TSHL) amounts to 16.57 million won and 54.07 million won. As the distance is farther and the house price cheaper, the improvement of HAI is more outstanding. City hall area showed the highest improvements of HAI by 9.3% (transit commute 1) and 21.9% (transit commute 2) increase, in comparison with car using commute.

청각적 Oddball 작업 수행 시 난이도에 따른 사건관련 전위 및 감마대역 활동 변화 특성

최정우,윤진,김지현,김경환,Choi, Jeong-Woo,Yoon, Jin,Kim, Chi-Hyun,Kim, Kyung-Hwan 대한의용생체공학회 2009 의공학회지 Vol.30 No.4

The purpose of this study is to observe the change in gamma-band cortical activities (GBAs) due to task difficulty. Event-related potential and gamma-band activity were investigated using electroencephalograms recorded during auditory oddball tasks with two difficulty levels. For more difficult task, the amplitude of P300 decreased and the peak latency of P300 was delayed significantly compared to easier task. The induced GBA decreased considerably during the P300 latency period and the peak latency of the induced GBA was delayed for more difficult task. The results imply that the difficulty-related change in cortical information processing may be implemented as a change in the strength of local neuronal association.

수질화학 조성이 수자원환경에서의 미세 부유입자 응집 거동에 미치는 영향 연구

최정우,이병준,Choi, Jeong Wooa,Lee, Byung Joon 한국수자원학회 2017 한국수자원학회논문집 Vol.50 No.11

생체고분자물질은 수자원환경에서 점토, 미생물, 바이오매스 등 부유입자들을 응집시키고, 침전, 퇴적시키는 역할을 한다. 본 연구는 다양한 수질화학 조건이 생체고분자물질에 의한 부유입자 응집에 미치는 영향을 파악하고자, 수질화학 조건을 제어하여 응집실험을 수행하였다. 각 응집실험은 이온강도, 2가 양이온 농도, 휴믹물질 분율이 제어된 실험조건에서 Kaolinite 현탄액에 생체고분자물질인 Xanthan Gum을 주입하여 수행하였다. 수체가 가지는 응집능은 응집체 크기 및 잔류 고형물 농도를 측정을 통하여 평가하였다. 본 연구에서, 이온강도 증가는 점토입자 및 생체고분자물질 간 정전기적 반발력을 감소시키고 생체고분자물질이 점토입자 간 가교를 형성하여 응집을 증대시킨 것으로 파악되었다. 이온강도가 0.001에서 0.1 M NaCl로 증대될 경우, 응집을 증진시켜 응집체 크기는 약 3배 이상 증대되고 부유고형물농도는 약 2.5배 이상 저감되었다. 또한, 2가 양이온이 수체에 존재하는 경우, 점토입자-생체고분자물질 혹은 생체고분자물질 상호 간 가교를 형성하여, 즉 점토-$Ca^{2+}$-고분자 또는 고분자-$Ca^{2+}$-고분자 가교를 형성하여, 생체고분자물질에 의한 부유입자 응집을 증대시켰다. 수체에 $Ca^{2+}$가 낮은 농도라도 존재할 경우, 응집을 크게 증진시켜 부유고형물농도가 원 주입농도에 비하여 20배 이상 저감되는 것으로 나타났다. 하지만, 휴믹물질이 존재하는 경우, 점토입자 표면에 흡착되어 점토입자의 정전기적 반발력을 증대시켜 생체고분자물질의 흡착을 방해하고 응집을 감소시켰다. 수체에 휴믹물질이 존재할 경우, 응집을 저감시켜 부유고형물농도는 저감되지 않고 원 주입농도와 유사하게 나타났다. 본 연구의 결과는 수자원환경에서 부유입자 및 퇴적물 거동을 이해하고 수질 및 퇴적물에 대한 최적 관리 방안을 도출하기 위한 기초 자료로 활용될 수 있으리라 기대된다. Extracellular Polymeric Substances (EPS) in the water environment assemble fine, colloidal particles, such as clays, microorganisms and biomass, in large flocs, which are eventually subject to sedimentation and deposition and determine water/sediment quality and quantity. This study hence aimed to investigate the way that water and colloidal chemistry affects EPS-mediated flocculation of colloidal particles, using a jar-test experiment. Especially, ionic strength, divalent cation and humic substances concentrations were selected as experimental variables in the jar-test experiments, to elucidate their effects on EPS-mediated flocculation. A higher ionic strength increased flocculation capability, reducing electrostatic repulsion between EPS-attached colloidal particles and enhancing particle aggregation. 0.1 M NaCl ionic strength had higher flocculation capability, with 3 times larger floc size and 2.5 times lower suspended solid concentration, than 0.001 M NaCl. Divalent cations, such as $Ca^{2+}$, built divalent cationic bridges between colloidal particles and EPS (i.e., $colloid-Ca^{2+}-EPS$ or $EPS-Ca^{2+}-EPS$) and hence made colloidal particles to build into large, settelable flocs. A small $Ca^{2+}$ concentration enhanced flocculation capability, reducing suspended solid concentration 20 times lower than the initial dosed concentration. However, humic substances, adsorbed on colloidal particles, reduced flocculation, because they blocked EPS adsorption on colloidal particles and increased negative charges and electrostatic repulsion of colloidal particles. Suspended solid concentration in the tests with humic substances remained as high as the initial dosed concentration, indicating stabilization rather than flocculation. Findings about EPS-mediated flocculation in this research will be used for better understanding the fate and transport of colloidal particles in the water environment and for developing the best management practices for water/sediment quality.

회원작품 - 천연기념물센터 전시관 리노베이션

최정우,Choi, Jungwoo 대한건축사협회 2018 建築士 Vol.594 No.-

뇌졸중 후 양안의 동측 상방 수평반맹을 호소하는 환자 한의 치험 1례

최정우,김서영,김하리,신희연,양승보,조승연,박성욱,고창남,박정미,Choi, Jeong-Woo,Kim, Seo-Young,Kim, Ha-Ri,Shin, Hee-Yeon,Yang, Seung-Bo,Cho, Seung-Yeon,Park, Seong-Uk,Ko, Chang-Nam,Park, Jung-Mi 대한중풍순환신경학회 2019 대한중풍.순환신경학회지 Vol.20 No.1

■ Objectives The purpose is to report the case of Korean medicine in the treatment of bilateral superior altitudinal hemianopia after a stroke. ■ Methods The patient was treated with acupuncture, electroacupuncture, bee venom, and herbal medicine. The visual field defect was assessed using humphrey visual field analyzer and confrontation visual field test. ■ Results After treatment, humphrey visual field analyzer and confrontation visual field test showed improvement in field of vision ■ Conclusion This study suggested that Korean medical treatment could be an effective option for treating visual field defect after stroke.

약물 중단에도 지속되는 약인성 파킨슨증후군 환자의 한의 치험 1례

최정우,김서영,전규리,황예채,조승연,박정미,고창남,박성욱,Choi, Jeong-woo,Kim, Seo-young,Jun, Gyu-ri,Hwang, Ye-chae,Cho, Seung-yeon,Park, Jung-mi,Ko, Chang-nam,Park, Seong-uk 대한한방내과학회 2021 大韓韓方內科學會誌 Vol.42 No.6

This study examined the effectiveness of Korean medical treatment in a patient with persistent drug-induced parkinsonism after drug discontinuation. The changes in symptoms were assessed using the unified parkinson's disease rating scale (UPDRS), postural instability-gait disturbance (PIGD) score, and the 20 m gait time and steps. After 22 days of hospitalization, the UPDRS, PIGD score, and 20 m gait time and steps showed clinically significant improvement. The improvement persisted after discharge. This study indicated that Korean medical treatment could be an effective alternative therapy for treating persistent drug-induced parkinsonism after drug discontinuation.

탄산칼슘 분말을 충진시킨 열가소성 탄성체 복합재의 제조 및 차음 특성

최정우,황연,Choi, Jung-Woo,Hwang, Yeon 한국재료학회 2010 한국재료학회지 Vol.20 No.9

Composites of ceramic powders and an elastomer-based matrix were prepared by mixing $CaCO_3$ powders with polyethylene and polypropylene elastomers, and their mechanical and sound insulation properties were measured. $CaCO_3$ powders with 0.7 ${\mu}m$ and 35 ${\mu}m$ particle size were added to elastomers up to 80 wt%. Scanning electron microscopy photographs showed uniform distribution of the $CaCO_3$ powders in the matrix. While density and surface hardness increased, melt index, tensile strength and elongation of the composites decreased as the amount of added $CaCO_3$ powders increased. As more $CaCO_3$ powders were added sound transmission loss of the composites increased owing to the increase of density. Addition of 0.7 ${\mu}m$ sized $CaCO_3$ powders resulted in a slightly higher transmission loss than the addition of 35 ${\mu}m$ sized powders because of the increased interface area between the elastomer matrix and the $CaCO_3$ powders. Composites with a polyethylene matrix showed higher transmission loss than those with a polypropylene matrix because the tensile strength and hardness of the polyethylene-based composites were low and their elongation was high.

보행장애를 호소하는 초기 다계통 위축증(MSA-C) 환자 한의 치험 1례

최정우,김서영,김하리,전규리,조승연,박성욱,박정미,고창남,Choi, Jeong-Woo,Kim, Seo-Young,Kim, Ha-Ri,Jeon, Gyu-Ri,Cho, Seung-Yeon,Park, Seong-Uk,Park, Jung-Mi,Ko, Chang-Nam 대한중풍순환신경학회 2020 대한중풍.순환신경학회지 Vol.21 No.1

■ Objectives The purpose of this case is to report the effectiveness of Korean medicine in the treatment of early stage multiple system atrophy-cerebellar ataxia(MSA-C) ■ Methods The patient was treated with acupuncture, bee venom, and herbal medicine. The clinical symptoms was assessed using unified multiple system atrophy rating scale(UMSARS) and 20M gait time and steps. ■ Results After treatment, UMSARS score and 20M gait time and steps showed improvement. ■ Conclusion This study suggested that Korean medical treatment could be an effective option for treating early stage MSA-C.

오염수 내의 유기인 화합물의 측정을 위한 광섬유 바이오센서 ( 제 1부 : 장치 설계 및 개발 )

최정우,민준홍,이원홍 ( Jeong Woo Choi,Jun Hong Min,Won Hong Lee ) 한국센서학회 1994 센서학회지 Vol.3 No.2

Fiber-optic biosensor for the detection of organophosphorus compounds in a contaminated water was developed, which was the component of pesticides and agricultural agent. The detection principle of designed sensor was the pH variance induced by a reaction of acetylcholinesterase enzyme inhibited by organophosphorus compounds. The pH variance was detected by the optical system to measure the organophosphorus compounds. Litmus was selected as the pH-sensitive dye suitable to the enzyme reaction and a light source to be detected by the optical system. The enzyme entrapped in Ca-alginate gel was immobilized at the inner wall to maintain the high activity of enzyme and to be reused for a long period. The optical fiber was used to miniaturize and control remotely the sensor system. The He-Ne laser with 632 nm was selected as the light source to prevent light intensity fluctuation by the product. Cheap plastic optical fibers were used as the transmission part of the light and the phototransistor was used as the reception part of light based on the wavelength of He-Ne laser. The proposed fiber-optic biosensor has the linear analytical range of 0 ppm-1.5 ppm with response time of 5 minutes.