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알츠하이머 치매 환자에서의 인지영역별 기능과 병식과의 연관성
김영돈(Youngdon Kim),김상하(Sang Ha Kim),명우재(Woojae Myung),최준배(Junbae Choi),윤혜연(Hyeyeon Yoon),강효신(Hyo Shin Kang),나덕렬(Duk L. Na),김성윤(Seong Yoon Kim),이재홍(Jae-Hong Lee),한설희(Seol-Heui Han),최성혜(Seong Hye Choi),김 대한노인정신의학회 2014 노인정신의학 Vol.18 No.2
Objective:The aim of this study was to investigate the association between cognitive subdomains and insight into one’s cognitive impairment in patients with Alzheimer disease (AD). Methods:We recruited 1,722 patients with AD from the Clinical Research of Dementia of South Korea study and designed a cross-sectional study. Each patient’s cognitive subdomain was assessed by using the Seoul Neuropsychological Screening Battery-Dementia version. Severity of dementia was evaluated by Korean version of Mini-Mental Status Examination (K-MMSE) and Clinical Dementia Rating Sum of Boxes (CDR-SB). Insight into one’s cognitive impairment was categorized as ‘with insight’ and ‘without insight’ through interview with patient’s caregivers. Results:Among the 1,722 patients with AD, 1,475 patients were included in the ‘with insight’ group and the remaining 247 patients were included in the ‘without insight’ group. Subjects in the ‘without insight’ group had lower K-MMSE and CDR-SB scores than those in the ‘with insight’ group. After controlling for demographic data and dementia severity, higher scores on both attention function (odds ratio=1.12, 95% confidence interval : 1.03-1.21) and frontal-executive function (odds ratio=1.03, 95% confidence interval : 1.01-1.05) significantly predicted the membership to ‘with insight’ group. Conclusion:In patients with AD, attention and frontal-executive function were associated with insight into one’s cognitive impairment.
철근 콘크리트 교량의 열화 평가를 위한 지표투과레이더 자료의 완전파형역산
안영돈(Youngdon Ahn),최용규(Yongkyu Choi),장한누리(Hannuree Jang),이동권(Dongkweon Lee),장한길로(Hangilro Jang),신창수(Changsoo Shin) 한국지반환경공학회 2024 한국지반환경공학회논문집 Vol.25 No.2
Reinforced concrete bridge decks are the first to be damaged by vehicle loads and rain infiltration. Concrete deterioration primarily occurs owing to the corrosion of rebars and other metal components by chlorides used for snow and ice melting. The structural condition and concrete deterioration of the bridge decks within the pavement were evaluated using ground-penetrating radar (GPR) survey data. To evaluate concrete deterioration in bridges, it is necessary to develop GPR data analysis techniques to accurately identify deteriorated locations and rebar positions. GPR exploration involves the acquisition of reflection and diffraction wave signals due to differences in radar wave propagation velocity in geotechnical media. Therefore, a full-waveform inversion (FWI) method was developed to evaluate the deterioration of reinforced concrete bridge decks by estimating the radar wave propagation velocity in geotechnical media using GPR data. Numerical experiments using a GPR velocity model confirmed the deterioration phenomena of bridge decks, such as concrete delamination and rebar corrosion, verifying the applicability of the developed technology. Moreover, using the synthetic GPR data, FWI facilitates the determination of rebar positions and concrete deterioration locations using inverted velocity images.
윤영돈(Youngdon Yoon),최순옥(Soonok Choi) 한국도덕윤리과교육학회 2015 도덕윤리과교육 Vol.- No.46
우리는 신자유주의 질서와 이로 인한 무한 경쟁이 삶의 전 영역에 침투된 피로 사회 속에서 살아가고 있다. 본 연구는 이러한 피로 사회에서 “어떻게 노동의 의미를 찾고, 직업윤리의 방 향을 설정할 것인가”를 연구 문제로 삼았다. 하나의 직업은 소명직, 전문직, 생계직의 성격을 지니는데, 이러한 근거를 우리는 서양의 역사적 맥락, 즉 고대 희랍의 노동관, 루터와 칼빈을 중심으로 한 근세 프로테스탄티즘의 노동관 및 자본주의 정신과의 관계를 중심으로 살펴본다. 노동의 의미를 고찰하는 데 있어서 소외 문제를 다루는 것은 필수불가결한 과제이다. 이에 소 외된 노동의 문제를 마르크스의 견해를 중심으로 해명하며, 상품으로 소외된 감정과 관련한 감정노동의 문제에 대해서도 논구한다. 끝으로 우리 시대에 소득 양극화와 비정규직을 양산하 는 시장논리의 폐해를 극복할 수 있는 직업윤리의 전제조건으로서 ‘인간은 더불어 사는 존재’ 라는 공유된 이해에 기반하여 직업윤리의 방향설정에 대해 다룬다. We are living in a fatigue society where turbulence of neo-liberalism permeates every aspects of our lives. Our concern in this project begins with a question “how can we find the meaning of labor and establish the direction of vocational ethics?” A vocation that we are executing in a society is characterized by 3 different kinds of calling, profession and occupation. We can constitute the meaningful concept of vocation through investigating the view of labor in ancient Greek, and the relationship between protestantism and capitalism focusing on Luther & Calvin. In addition, to examine the meaning of labor, it is necessary to solve the problem of alienation. For this, we clarify the question of alienated labor which Marx raised, and examine that of emotional labor related with alienated emotion as goods. In order to overcome abusive practices of market place which leads to income polarization and temporary workers nowadays, we deal with the notion of shared understanding as a premise of vocational ethics which is based upon a belief that man is by nature a social being. In conclusion, we propose a direction towards vocational ethics.
In-situ 졸-겔 법을 이용한 저가습 작동용 수소 이온 교환막 연료전지용(PEMFC) 나피온/TiO<sub>2</sub> 복합막
최범석 ( Beomseok Choi ),고영돈 ( Youngdon Ko ),김화중 ( Whajung Kim ) 한국공업화학회 2019 공업화학 Vol.30 No.1
저가습 작동을 위한 수소 이온 교환막 연료전지용 Nafion/TiO<sub>2</sub> 복합막을 졸-겔 법을 이용하여 제조하였다. 이때 Nafion 막에 TiO<sub>2</sub> 나노 입자를 함침시키기 위하여 TiO<sub>2</sub> 전구체 용액에 1일부터 7일까지 함침 시간을 달리하여 복합막을 제조 하였다. 담금 시간이 증가할수록 Nafion막 내에 함침되는 TiO<sub>2</sub> 함량이 증가하였다. TiO<sub>2</sub> 함량이 증가함에 따라 막의 표면의 친수성이 증가하면서 접촉각은 감소하는 것을 보여주었다. 물 흡수력(water uptake)과 복합막을 통한 수소 이온 전도도는 담금 시간이 4일인 경우 가장 높게 나타났고 4일 이상인 경우에는 오히려 감소하는 경향을 보여주었다. 담금 시간이 7일인 경우에는 큰 TiO<sub>2</sub> 입자들이 막의 표면과 내부에 생성되어 애노드에서 캐소드로의 수소 이온 전도를 방해하게 되는 결과를 초래하였다. 전지 성능 시험 결과 물 흡수력 및 수소 이온 전도도의 결과와 상당히 일치하는 것을 보여주었다. 즉, 0.6 V에서 담금 시간이 1일, 3일, 4일 및 7일인 경우 전류 밀도가 상대 습도(relative humidity, RH) 40%에서 각각 0.54, 0.6, 0.63 A/㎠ 및 0.49 A/㎠를 나타내었다. Nafion 분산액과 TiO<sub>2</sub> 입자를 혼합하여 제작한 막과 Nafion 115를 이용하여 RH 40%에서 수행한 전지 성능 결과와 비교할 때 졸-겔 법을 이용하여 제조한 복합막의 경우 약 66%의 전지 성능 향상을 얻을 수 있었다. Nafion/TiO<sub>2</sub> composite membranes were prepared via an in-situ sol-gel process with different immersing periods from 1 day to 7 days for the low humidifying proton exchange membrane fuel cell. As the immersing time increased, the TiO<sub>2</sub> content within the Nafion membrane increased. The contact angle decreased with the increased TiO<sub>2</sub> content in the composite membrane due to the increased hydrophilicity. The water uptake and proton conductivity reached to the highest level for 4 day immersing period, then decreased as the immersing period increased. A 7 days of immersing time was shown to be too long because too much TiO<sub>2</sub> aggregates were formed on the membrane surface as well as interior of the membrane, interfering the proton transfer from anode to cathode. Cell performance results were in good agreement with those of the water uptake and proton conductivity; current densities under a relative humidity (RH) of 40% were 0.54, 0.6, 0.63 A/㎠ and 0.49 A/㎠ for the immersing time of 1, 3, 4 and 7 days, respectively at a 0.6 V. The composite membrane prepared via the in-situ sol-gel process exhibited the enhancement in the cell performance under of RH 40% by a maximum of about 66% compared to those of using the recasting composite membrane and Nafion 115.
흡착제를 이용한 매립지가스 내 CO<sub>2</sub> 분리 특성
허려화 ( Ryehwa Heo ),유영돈 ( Youngdon Yoo ),김문현 ( Munhyun Kim ),김형택 ( Hyungtaek Kim ),최익환 ( Ikhwan Choi ) 한국신재생에너지학회 2009 신재생에너지 Vol.5 No.4
The purpose of this study is to investigate selective adsorption of CO<sub>2</sub> from LFG (Landfill gas) by using commercialized NaX-type zeolite adsorbent under the ambient temperature and pressure. The experiment of CO<sub>2</sub> adsorption was carried out by using simulated LFG. The CO<sub>2</sub> adsorption capacity and separation efficiency of NaX-type adsorbent were investigated by analyzing gas flow rate and gas composition at inlet and outlet of the adsorption reactor. The adsorbed CO<sub>2</sub> were desorbed under decompression condition which 0.5 Torr or by air purge. Through the result to use simulated LFG, when the method of VSA was used, 73.2~75.3 mg of CO<sub>2</sub> was adsorbed per 1 g commercial adsorbent, when the method of air purge was used, 78.4~83.2 mg of CO<sub>2</sub> was adsorbed per 1 g of commercial adsorbent.
Temperature-Tracking Sensing Scheme With Adaptive Precharge and Noise Compensation Scheme in PRAM
Junyoung Ko,Jisu Kim,Youngdon Choi,Park, H. K.,Seong-Ook Jung IEEE 2015 IEEE Transactions on Circuits and Systems I: Regul Vol.62 No.8
<P>Phase-change random access memory (PRAM) is considered to be one of the most promising storage class memory candidates. In this paper, several circuit techniques are introduced to satisfy the target yield and sensing time requirements of an 8-Gb PRAM. First, we propose a temperature-tracking reference current generator to compensate for the variation in data current caused by the change in the resistance of phase-change materials. Second, an adaptive precharge scheme to solve the problem of large parasitic resistances and capacitances of a global bitline is proposed. Finally, we introduce noise compensation schemes to reduce coupling noise. The verification of the proposed circuit techniques is performed by HSPICE simulation using the 0.25- μm model parameters used in peripheral circuit of Samsung's 20 nm PRAM technology. The sensing scheme using temperature tracking reference current generator achieves 9.32σ ( ~ 100%) of read access pass yield in 8-Gb PRAM and 99 ns of the sensing time is achieved using the adaptive precharge scheme and noise compensation schemes.</P>