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Yoon, Jungjin,Sung, Hyangki,Lee, Gunhee,Cho, Woohyung,Ahn, Namyoung,Jung, Hyun Suk,Choi, Mansoo The Royal Society of Chemistry 2017 Energy & environmental science Vol.10 No.1
<P>With rapid and brilliant progress in performance over recent years, perovskite solar cells have drawn increasing attention for portable power source applications. Their advantageous features such as high efficiency, low cost, light weight and flexibility should be maximized if a robust and reliable flexible transparent electrode is offered. Here we demonstrate highly efficient and reliable super flexible perovskite solar cells using graphene as a transparent electrode. The device performance reaches 16.8% with no hysteresis comparable to that of the counterpart fabricated on a flexible indium-tin-oxide electrode showing a maximum efficiency of 17.3%. The flexible devices also demonstrate superb stability against bending deformation, maintaining >90% of its original efficiency after 1000 bending cycles and 85% even after 5000 bending cycles with a bending radius of 2 mm. This overwhelming bending stability highlights that perovskite photovoltaics with graphene electrodes can pave the way for rollable and foldable photovoltaic applications.</P>
Son, Yoon Jun,Kang, Jin Soo,Yoon, Jungjin,Kim, Jin,Jeong, Juwon,Kang, Jiho,Lee, Myeong Jae,Park, Hyun S.,Sung, Yung-Eun American Chemical Society 2018 The Journal of Physical Chemistry Part C Vol.122 No.13
<P>Dye-sensitized solar cells (DSSCs) are highly efficient and reliable photovoltaic devices that are based on nanostructured semiconductor photoelectrodes. From their inception in 1991, colloidal TiO<SUB>2</SUB> nanoparticles (NPs) with the large surface area have manifested the highest performances and the particle size of around 20 nm is generally regarded as the optimized condition. However, though there have been reports on the influences of particle sizes in conventional DSSCs employing iodide redox electrolyte, the size effects in DSSCs with the state-of-the-art cobalt electrolyte have not been investigated. In this research, systematic analyses on DSSCs with cobalt electrolytes are carried out by using various sizes of NPs (20-30 nm), and the highest performance is obtained in the case of 30 nm sized TiO<SUB>2</SUB> NPs, indicating that there is a reversed power conversion efficiency trend when compared with those with the iodide counterpart. Detailed investigations on various factors-light harvesting, charge injection, dye regeneration, and charge collection-reveal that TiO<SUB>2</SUB> particles with a size range of 20-30 nm do not have a notable difference in charge injection, dye regeneration, and even in light-harvesting efficiency. It is experimentally verified that the superior charge collection property is the sole origin of the higher performance, suggesting that charge collection should be prioritized for designing nanostructured TiO<SUB>2</SUB> photoelectrodes for DSSCs employing cobalt redox electrolytes.</P> [FIG OMISSION]</BR>
Impact of Demographic Changes on Inflation and the Macroeconomy
YOON, JONG-WON,KIM, JINILL,LEE, JUNGJIN Korea Development Institute 2018 KDI Journal of Economic Policy (KDI JEP) Vol.40 No.1
Ongoing demographic changes have brought about a substantial shift in the size and age composition of the population, which are having a significant impact on the global economy. Despite potentially grave consequences, demographic changes usually do not take center stage in many macroeconomic policy discussions or debates. This paper illustrates how demographic variables move over time and analyzes how they influence macroeconomic variables such as economic growth, inflation, savings and investment, and fiscal balances, from an empirical perspective. Based on empirical findings-particularly regarding inflation-we discuss their implications on macroeconomic policies, including monetary policy. We also highlight the need to consider the interactions between population dynamics and macroeconomic variables in macroeconomic policy decisions.
모바일 시각 검색 시스템의 성능 향상을 위하여 개선된 Speeded Up Robust Features(SURF) 알고리듬
서정진(Jungjin Seo),윤경로(Kyoungro Yoon) 한국방송·미디어공학회 2012 방송공학회논문지 Vol.17 No.2
In the paper, we propose enhanced feature extraction and matching methods for a mobile environment based on modified SURF. We propose three methods to reduce the computational complexity in a mobile environment. The first is to reduce the dimensions of the SURF descriptor. We compare the performance of existing 64-dimensional SURF with several other dimensional SURFs. The second is to improve the performance using the sign of the trace of the Hessian matrix. In other words, feature points are considered as matched if they have the same sign for the trace of the Hessian matrix, otherwise considered not matched. The last one is to find the best distance-ratio which is used to determine the matching points. We find the best distance-ratio through experiments, and it gives the relatively high accuracy. Finally, existing system which is based on normal SURF method is compared with our proposed system which is based on these three proposed methods. We present that our proposed system shows reduced response time while preserving reasonably good matching accuracy.
Jung-Ro Yoon(윤정로),Yoonjung Kim(김윤정),Jungjin Yu(유중진),Jae-Hyuk Yang(양재혁) 대한정형외과학회 2014 대한정형외과학회지 Vol.49 No.5
본 증례에서는 관절경 수술 시 우연히 발견된 흑색 반월상 연골판에 대한 보고이다. 추가적인 검사에서 이전에 환자는 몰랐던 알캅톤뇨증이 확인되었다. 슬관절 관절경 치료 이후 환자의 주증상이었던 반복적인 슬관절 삼출과 불편감은 완화되었다. In this report, a case of a black meniscus with underlying ochronosis is described. Further analysis by laboratory findings showed that the patient had underlying alkaptonuria, which was previously undiagnosed. The patient’s symptoms showed improvement after arthroscopic treatment.
Carbon-sandwiched perovskite solar cell
Ahn, Namyoung,Jeon, Il,Yoon, Jungjin,Kauppinen, Esko I.,Matsuo, Yutaka,Maruyama, Shigeo,Choi, Mansoo The Royal Society of Chemistry 2018 Journal of Materials Chemistry A Vol.6 No.4
<P>Promising perovskite solar cell technology with soaring power conversion efficiencies has the common problems of low stability and high cost. This work provides a solution to these problems by employing a carbon sandwich structure, in which the fullerene bottom layer solves the stability issue and the carbon nanotube top electrode layer offers the merits of having high stability and being low-cost. Devices fabricated using different hole-transporting materials infiltrated into carbon nanotube networks were examined for their performance and stability under constant illumination in air. Polymeric hole-transporting layers show much higher stability when combined with carbon nanotubes due to their compact nature and stronger interaction with the carbon network. As a result, the encapsulated device showed high stability both in air and under light illumination, maintaining up to 80% of the initial efficiency after 2200 hours under actual operation conditions. Cost analysis also shows that using the polymeric hole-transporting materials in carbon nanotube films brings the fabrication cost down to less than 5.5% that of conventional devices. Our study proposes a promising cell structure toward highly stable and low-cost perovskite photovoltaic technologies for the future.</P>
감성 및 상황 정보 융합 기반의 확장된 협업 필터링 기법을 이용한 음악추천시스템
최현석(Hyunsuk Choi),배효철(Hyochul Bae),서정진(Jungjin Seo),윤경로(Kyoungro Yoon) 한국방송·미디어공학회 2011 한국방송공학회 학술발표대회 논문집 Vol.2011 No.7
본 논문에서는 사용자의 개인적 취향에 맞는 음악을 추천할 수 있는 사용자 감성/상황 정보 융합 기반의 협업 필터링의 확장을 이용한 음악추천시스템을 소개한다. 본 논문에서 제안하는 시스템은 확장된 협업 필터링 방식을 사용하여 추천을 해준다. 이를 위해 본 논문에서는 추천의 근거가 되는 감성과 무드를 Thayer 음악 무드 모델을 이용하여 총 12 가지의 감성 정보, 8cluster 의 무드 정보로 분류했다. 또한 사용자의 상황 정보, 활동 & 날씨 & 시간에 대해서도 분류하였다. 분류된 정보는 음악감상 UI 를 이용하여 사용자 별 감성, 상황 그리고 음원의 무드 정보로 수집이 되었고, 수집된 정보를 기반으로 사용자 감성과 청취 곡 횟수를 퓨전하여 평가치 매트릭스를 만들었으며, 이를 바탕으로 단계적 협업 필터링에 의해 사용자 취향에 맞는 음악을 추천해 주는 방법이다.