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Shin, Jisoo,Kim, Min,Kang, Boseok,Lee, Jaewon,Kim, Heung Gyu,Cho, Kilwon The Royal Society of Chemistry 2017 Journal of materials chemistry. A, Materials for e Vol.5 No.32
<▼1><P>The control of the molecular energy levels of the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) is crucial to the design of highly efficient polymer solar cells (PSCs).</P></▼1><▼2><P>The control of the molecular energy levels of the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) is crucial to the design of highly efficient polymer solar cells (PSCs). In particular, the fine control of the HOMO energy level is vital because it can ensure that polymer solar cell devices have a high open circuit voltage (<I>V</I>oc) and a high short circuit current density (<I>J</I>sc). We systematically synthesized a series of polymers substituted with different numbers of fluorine (F) atoms in conjugated side chains to fine-tune the HOMO energy levels of the donor polymer, and then optimized the associated solar cell devices by varying the length of the alkyl chain in the conjugated side chains. A series of conjugated side chains with non-fluorinated (0F), mono-fluorinated (1F), and di-fluorinated (2F) alkoxyphenyl groups at the <I>meta</I> position were synthesized and introduced into the donor polymer. The strong electron-withdrawing properties of fluorine were found to reduce the HOMO energy level and yield high <I>V</I>oc values up to 1.01 V. The substitution of the conjugated side chain with fluorine affects not only the energy level of the polymer but also its intermolecular packing and crystallinity due to the resulting intermolecular interactions, and was found to be effective in the control of <I>J</I>sc and FF. A maximum efficiency of 7.64% was achieved for the polymer with the mono-fluorinated conjugated side chain.</P></▼2>
CREEC: Chain Routing with Even Energy Consumption
Jisoo Shin,서창진 한국통신학회 2011 Journal of communications and networks Vol.13 No.1
A convergecast is a popular routing scheme in wireless sensor networks (WSNs) in which every sensor node periodically forwards measured data along configured routing paths to a base station (BS). Prolonging lifetimes in energy-limited WSNs is an important issue because the lifetime of a WSN influences on its quality and price. Low-energy adaptive clustering hierarchy (LEACH)was the first attempt at solving this lifetime problem in convergecast WSNs, and it was followed by other solutions including power efficient gathering in sensor information systems (PEGASIS) and power efficient data gathering and aggregation protocol (PEDAP). Our solution—chain routing with even energy consumption (CREEC)—solves this problem by achieving longer average lifetimes using two strategies: i) Maximizing the fairness of energy distribution at every sensor node and ii) running a feedback mechanism that utilizes a preliminary simulation of energy consumption to save energy for depleted sensor nodes. Simulation results confirm that CREEC outperforms all previous solutions such as LEACH, PEGASIS, PEDAP, and PEDAPpower aware (PA) with respect to the first node death and the average lifetime. CREEC performs very well at all WSN sizes, BS distances and battery capacities with an increased convergecast delay.
Shin, Jisoo,Choi, Eun Jung,Cho, Jung Ho,Cho, Ann-Na,Jin, Yoonhee,Yang, Kisuk,Song, Changsik,Cho, Seung-Woo American Chemical Society 2017 Biomacromolecules Vol.18 No.10
<P>Electrically conductive hyaluronic acid (HA) hydrogels incorporated with single-walled carbon nanotubes (CNTs) and/or polypyrrole (PPy) were developed to promote differentiation of human neural stem/progenitor cells (hNSPCs). The CNT and PPy nanocomposites, which do not easily disperse in aqueous phases, dispersed well and were efficiently incorporated into catechol-functionalized HA (HA CA) hydrogels by the oxidative catechol chemistry used for hydrogel cross-linking. The prepared electroconductive HA hydrogels provided dynamic, electrically conductive threedimensional (3D) extracellular matrix environments that were biocompatible with hNSPCs. The HA CA hydrogels containing CNT and/or PPy significantly promoted neuronal differentiation of human fetal neural stem cells (hfNSCs) and human induced pluripotent stem cell-derived neural progenitor cells (hiPSC-NPCs) with improved electrophysiological functionality when compared to differentiation of these cells in a bare HA CA hydrogel without electroconductive motifs. Calcium channel expression was upregulated, depolarization was activated, and intracellular calcium influx was increased in hNSPCs that were differentiated in 3D electroconductive HA CA hydrogels; these data suggest a potential mechanism for stem cell neurogenesis. Overall, our bioinspired, electroconductive HA hydrogels provide a promising cell-culture platform and tissue-engineering scaffold to improve neuronal regeneration.</P>
Engineered Chondroitin Sulfate Hydrogel for Cartilage Tissue Engineering
Jisoo SHIN,Eun-Hye KANG,Soojeong CHOI,Donyoung KANG,Hyungsuk LEE,In Sik YUN,Seung-Woo CHO 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
Biomaterials mimicking the extracellular matrix (ECM) for cartilage tissue engineering have been broadly studied. Among those ECM-like biomaterials, chondroitin sulfate (CS), which is the main component of the cartilage ECM, has been paid attention. However, current CS-based hydrogel systems with unsuitable degradation kinetics, insufficient mechanical property, and lack of integration remain challenging. In this study, we utilized mussel-inspired catechol (CA) chemistry to overcome such limitations. Engineered CA functionalized CS hydrogel (CS-CA) showed tunable physical and mechanical properties, and excellent tissue adhesion. Furthermore, the chondrogenic differentiation of human adipose-derived mesenchymal stem cells was promoted by incorporating decellularized cartilage tissue dice. Finally, the transplantation of autologous cartilage dice using tissue-adhesive CS-CA hydrogels enhanced cartilage integration with host tissue and neo-cartilage formation. Our study showed a great potential of the CS-CA hydrogel system for cartilage tissue engineering.
IRIS-HiSA: Highly Scalable and Available Carrier-Grade SDN Controller Cluster
Shin, Jisoo,Kim, Taehong,Lee, Byungjoon,Yang, Sunhee BALTZER SCIENCE PUBLISHERS 2017 MOBILE NETWORKS AND APPLICATIONS Vol.22 No.5
<P>As software defined networking (SDN) extends its applications to carrier-grade networks, the need for high scalability and availability of a SDN controller is becoming increasingly important. Although existing works have shown the feasibility of a distributed controller, the switches in the data plane are required to know some of the internal specifics such as the IP addresses of the individual controller instances. This constraint increases the operational complexity as the number of controller instances increases. In this paper, we propose a distributed controller cluster architecture called IRIS-HiSA. The main goal is to support seamless load balancing and failover with horizontal scalability, as is done in existing works, but one of the distinguishing features of IRIS-HiSA is to provide transparency to the switches in the data plane. Thus, the switches do not need to know the internal details of the controller cluster, and they simply access it in the same way a single controller is accessed. In addition to proving seamless load balancing and a failover, a performance evaluation is conducted to analyze the high scalability in which the throughput of the flow setup is proportionally increased with the number of controller instances.</P>
연료 물성치 변화가 가스터빈 노즐 분무 특성에 미치는 영향
신지수 ( Jisoo Shin ),김동환 ( Donghwan Kim ),박성욱 ( Sungwook Park ) 한국액체미립화학회 2018 한국액체미립화학회 학술강연회 논문집 Vol.2018 No.-
In heavy-duty gas turbine system, it is difficult to conduct experiments due to the huge requirements for space, cost, and time. On the other hand, the accuracy of analytical studies using CFD codes is increasing with advancing computer technology. Therefore, analytical studies of gas turbine using appropriate CFD code are needed. In stringent environmental regulations, the goal of gas turbine industry is to improve combustion efficiency and reduce exhaust emissions. The spatial distribution and the velocity distribution of fuel play an important role for combustion efficiency. For this reason, before the combustion analysis, the spray characteristics should be determined by spray analysis. Additionally, because the spray characteristics are dependent on the physical properties of the fuel, it is important to investigate the effect of fuel physical properties on spray characteristics. Therefore, in this study, the hollow cone spray of the gas turbine nozzle was modeled by LISA-TAB model using commercial CFD code, ANSYS Fluent 16.2. This model was validated by comparison with PDPA experiment and spray tomography. Also, VOF model was used to simulate the liquid film formation process of the nozzle sprayed from the slits. By using those models, the spray characteristics for various fuel properties were investigated.
신지수 ( Jisoo Shin ),조정호 ( Jung Ho Cho ),조승우 ( Seung Woo Cho ) 한국공업화학회 2015 공업화학전망 Vol.18 No.6
하이드로젤은 생체 조직과 유사한 물성과 다양한 특성으로 인하여 약물전달 및 조직공학 분야에서 유용한 생체재료로서 각광을 받고 있다. 다양한 기능성을 가지는 하이드로젤을 이용하여 각 응용 분야에서의 기존 문제점을 극복하고 나아가 더 진보된 소재로 개발될 수 있는 가능성을 보여주는 연구들이 활발히 진행되고 있다. 본 원고에서는 다양한 기능성 하이드로젤에 대해 설명하고 약물전달 및 조직공학 분야에서의 활용 방안을 소개하고자 한다.