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Performance Advantage for Electric Vehicles under Competition
Dawoon Jung(정다운),Byung Cho Kim(김병조),Myungsub Park(박명섭) 한국경영학회 2018 經營學硏究 Vol.47 No.1
Although most electric vehicles (EVs) can cover the majority of daily driving needs, customers are anxious that they will run out of electricity on the road before arriving at the destination. Thus, the availability and accessibility of charging stations become critical for increasing sales in EV market. As well as charging convenience, customers are attracted by high-performance, meaning that all relevant features (acceleration, maximum speed, braking, riding comfort, durability, safety, charging time, etc.) need to be balanced. However, in many cases, achieving the optimal balance requires additional expense so that it may cause pressure on price despite its expected benefits. Thus, we investigate how the EV manufacturers can cope with the trade-off between lowering price and improving performance under competition. Then, we compare the equilibrium performance levels and prices of EVs when performance improvement costs of competing firms differ. We also examine the equilibrium decision from the social perspective and provide the implications of how the socially favorable decision is different from that for manufacturers.
Jung, In Hye,Chung, Yong-Yoon,Jung, Dawoon E.,Kim, Young Jin,Kim, Do Hee,Kim, Kyung-Sik,Park, Seung Woo Neoplasia Press 2016 Neoplasia Vol.18 No.8
<P>Severe combined immunodeficiency (SCID) mice have widely been used as hosts for human tumor cell xenograft study. This animal model, however, is labor intensive. As zebrafish is largely emerging as a promising model system for studying human diseases including cancer, developing efficient immunocompromised strains for tumor xenograft study are also demanded in zebrafish. Here, we have created the <I>Prkdc</I>-null SCID zebrafish model which provides the stable immune-deficient background required for xenotransplantation of tumor cell. In this study, the two transcription activator-like effector nucleases that specifically target the exon3 of the zebrafish <I>Prkdc</I> gene were used to induce a frame shift mutation, causing a complete knockout of the gene function. The SCID zebrafish showed susceptibility to spontaneous infection, a well-known phenotype found in the SCID mutation. Further characterization revealed that the SCID zebrafish contained no functional T and B lymphocytes which reflected the phenotypes identified in the mice SCID model. Intraperitoneal injection of human cancer cells into the adult SCID zebrafish clearly showed tumor cell growth forming into a solid mass. Our present data show the suitability of using the SCID zebrafish strain for xenotransplantation experiments, and <I>in vivo</I> monitoring of the tumor cell growth in the zebrafish demonstrates use of the animal model as a new platform of tumor xenograft study.</P>
Dynamic 3-D Visualization of the Korea Pathfinder Lunar Orbiter Attitude Control Simulator
Dawoon Jung,Jae Wook Kwon,Kwangyul Baek,Han Woong Ahn,Jong-Wook Choi 제어로봇시스템학회 2020 제어로봇시스템학회 국제학술대회 논문집 Vol.2020 No.10
Visualizing the Korea Pathfinder Lunar Orbiter (KPLO) attitude control behavior is useful for verifying dynamical characteristics unseen in previous Earth-orbiting satellite missions. This paper describes a visualization component of the LUNASIM simulator running unmodified attitude control flight software that is able to communicate with an external program to animate realistically in three dimensions the simulated attitude and orbital state, thruster firings, and solar array rotations of KPLO at faster-than real-time speeds for intuitive design verification. Visualization is also supported when LUNASIM is connected to a processor emulator in a fully end-to-end simulated ETB environment. Results are presented illustrating accurate spacecraft dynamics during special mission scenarios such as roll maneuvering while Sun-pointing near the ecliptic plane, yaw-flipped lunar orbit attitude, and slewing to image the lunar surface while in 45-degree tilted attitude. These results demonstrate the value of visualizing attitude control simulator output for novel spacecraft missions.
JUNG, IN HYE,KIM, DO HEE,YOO, DA KYUNG,BAEK, SUN YOUNG,JEONG, SEONG HOON,JUNG, DAWOON E.,PARK, SEUNG WOO,CHUNG, YONG-YOON ANTICANCER RESEARCH 2018 IN VIVO -ATHENS- Vol.32 No.4
<P>Background/Aim: Natural killer (NK) cells are one of the lymphocytes clinically used for various cancer types. Cytotoxicity of NK cells to cholangiocarcinoma (CC), however, has not yet been studied. Nor NK cell therapy against CC has been clinically applied. In this study, relevance of NK cell therapy for anti-tumor efficacy against CC was pre-clinically investigated. Materials and Methods: Human HuCCT-1 cells, an intrahepatic CC cell line, were xenografted into nude mice. The HuCCT-1 tumor-bearing nude mice then received multiple infusions of ex vivo-expanded human NK cells (SMT01) and in vivo cytotoxic activity of the NK cells against the CC cells was evaluated. Results: SMT01 infusion resulted in significant inhibition of the CC tumor growth. Body weight of the mice administrated with chemotherapy was found to be maintained at the lowest level among all treatment groups while all the SMT01 infusion groups well maintained their body weight. Conclusion: The present in vivo study demonstrates that NK cells contain cytolytic activity against cholangiocarcinoma and show beneficial effect of NK cell therapy in relevance to quality of life. Further investigation of the NK cell-based immunotherapy can be useful to determine cancer therapeutics for the specific tumor.</P>
Multifaceted adsorption of α-cyano-4-hydroxycinnamic acid on silver colloidal and island surfaces
Jung, Dawoon,Jeon, Kooknam,Yeo, Juhyun,Hussain, Shafqat,Pang, Yoonsoo Elsevier 2017 APPLIED SURFACE SCIENCE - Vol.425 No.-
<P><B>Abstract</B></P> <P>The surface adsorption of organic nitrile compounds on the silver colloidal and island surfaces has been studied using surface-enhanced Raman scattering (SERS). α-Cyano-4-hydroxycinnamic acid (CHCA) with nitrile and carboxyl groups shows various surface adsorption on the silver surfaces. In acidic conditions, the surface adsorption of CHCA via the nitrile group with a more or less tilted geometry to the surface was found. When the solution pH increases, the carboxylate and nitrile groups of deprotonated CHCA participate in the surface adsorption, whereas the molecular plane of CHCA becomes more parallel to the surface. The ν(CN) band in SERS of CHCA is the indicator of the surface adsorption geometry. The strongly red-shifted and broadened ν(CN) band in SERS represents the surface adsorption via π-electrons of the CN bond (side-on geometry; π-coordination). Nitriles adsorbed on the surface via the nonbonding electron pair of the nitrogen atom (end-on geometry; σ-coordination) often cause the blue-shifts and small band broadening in ν(CN) in SERS. The surface adsorption geometry of organic nitriles based on many previous experimental results was further confirmed by the surface adsorption of CHCA on the silver island surfaces and dinitrile compounds on the silver colloidal surfaces.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Organic nitriles show two distinct adsorption geometries on silver nanosurfaces. </LI> <LI> Surface adsorption via nitrile and carboxylate groups showed strong pH dependence. </LI> <LI> SERS is a powerful tool for the molecular structure of surface-adsorbed species. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>