Complementarities in Platform Ecosystems: A Study of Coevolution of Made-in-Korea Digital Entertainment Phenomenon

Business ecosystems are pushed by competition to develop complementarities that increase their chances of survival. However, scholars continue to cite the lack of understanding in coevolution as a complementarity mechanisms of businesses, especially in the digital platform ecosystems. In this research-in-progress paper, we explore the development of complementarities, found in the coevolution of entities in digital platform ecosystems. Through initial case studies of globally developed Korean entertainment and culture industry, we discover a possible categorization of different types of coevolution in the digital platform ecosystem; namely ‘digital transformation’ – business coevolving with its environment, ‘platformization’ – core platform coevolving with its complementors, and ‘reconfiguration’- core ecosystem coevolving with its sub-ecosystems. Based on the findings, we suggest that there is a need to extend the definition of platform ecosystems to also incorporate the sub-ecosystems’ coevolutionary interaction. A new conceptual framework is presented with future plans to develop both the work and the model

The Red Queen Hypothesis and Improvisational Capabilities for Resilience: A Study of Korean Online Gaming Industry

Developing organizational resilience (OR) is now one of the core competencies for organizations’ survival. Yet, OR development, as a response to disruptions, is context specific. With previous studies highlighting the type of disruption addressed, we find that the technology-incurred disruptions have received less spotlight due to the prevailing ‘pro-ICT bias’. However, technology may also heavily disrupt organizations. Should an organization not be resilient towards it, its survival can be at risk. Among various methods and means of developing OR, digital resilience, which is to utilize information systems to develop resilience, is known to be critical. Therefore, we ask the following research question “How do organizations develop digital resilience addressing technology-driven disruptions? . Using the improvisational capabilities and the red queen hypothesis as our guide, we conduct an exploratory case study on the Korean online gaming industry. Preliminary analysis and results are shared and concluded with plans for future research developmen

EL2 deep donor state in semi-insulating GaAs revealed by frequency dependent positron mobility measurements

Positron mobility measurements carried out on semi-insulating GaAs, using the Doppler shift in annihilation radiation technique, show a sharp transition from a high mobility value ∼120 cm2 V-1 s-1 to a lower value ∼45 V-1 s-1 just below room temperature. The temperature of the transition is found to be dependent on the frequency of the applied AC bias. We show that this effect is an artifact due to the thermal ionization of the EL2 deep donor state, which in its ionized state forms a positive space charge that causes the positron to experience large electric fields. This observation suggests a new positron annihilation-based deep-level transient technique applicable to semi-insulating materials. © 1994 The American Physical Society.published_or_final_versio

Impact of acoustic enviornment on work in open-plan offices across job characteristics

© Proceedings of the 26th International Congress on Sound and Vibration, ICSV 2019. All rights reserved. This study aims to investigate the impacts of acoustic environment on the relationship between job characteristics and job satisfaction. Acoustic measurements and questionnaire surveys were conducted in open-plan offices in the UK and Korea. Background noise levels were recorded for 8 hours in each office and speech transmission index (STI) and sound pressure levels were measured for quantifying the single number quantities in ISO 3382-3. A total of 324 employees from 12 offices completed a questionnaire survey. The questionnaire included questions assessing noise disturbances and speech privacy, as well as job satisfaction and job characteristics. The result confirmed the strong impacts of job characteristics on self-rated job satisfaction. Background noise levels during working hours and reverberation time were negatively associated with job satisfaction; however, there were little influences of speech privacy and noise disturbance on job satisfaction. It was also observed that speech privacy, noise disturbance, background noise level, and cultural difference (Korea and UK) had moderating effects on the relationship between job characteristics and job satisfaction. In particular, greater speech privacy and lower background noise level increased the impacts of job characteristics on job satisfactio

Estimating liver weight of adults by body weight and gender

Aim: To estimate the standard liver weight for assessing adequacies of graft size in live donor liver transplantation and remnant liver in major hepatectomy for cancer. Methods: In this study, anthropometric data of body weight and body height were tested for a correlation with liver weight in 159 live liver donors who underwent donor right hepatectomy including the middle hepatic vein. Liver weights were calculated from the right lobe graft weight obtained at the back table, divided by the proportion of the right lobe on the computed tomography. Results: The subjects, all Chinese, had a mean age of 35.8 ± 10.5 years, and a female to male ratio of 118:41. The mean volume of the right lobe was 710.14 ± 131.46 mL and occupied 64.55% ± 4.47% of the whole liver on computed tomography. Right lobe weighed 598.90 ± 117.39 g and the estimated liver weight was 927.54 ± 168.78 g. When body weight and body height were subjected to multiple stepwise linear regression analysis, body height was found to be insignificant. Females of the same body weight had a slightly lower liver weight. A formula based on body weight and gender was derived: Estimated standard liver weight (g) = 218 + BW (kg) × 12.3 + gender × 51 (R 2=0.48) (female = 0, male = 1). Based on the anthropometric data of these 159 subjects, liver weights were calculated using previously published formulae derived from studies on Caucasian, Japanese, Korean, and Chinese. All formulae overestimated liver weights compared to this formula. The Japanese formula overestimated the estimated standard liver weight (ESLW) for adults less than 60 kg. Conclusion: A formula applicable to Chinese males and females is available. A formula for individual races appears necessary. © 2006 The WJG Press. All rights reserved.published_or_final_versio

Dark Matter Deficient Galaxies Produced via High-velocity Galaxy Collisions in High-resolution Numerical Simulations

Abstract The recent discovery of diffuse dwarf galaxies that are deficient in dark matter appears to challenge the current paradigm of structure formation in our universe. We describe numerical experiments to determine if so-called dark matter deficient galaxies (DMDGs) could be produced when two gas-rich, dwarf-sized galaxies collide with a high relative velocity of ∼300 km s−1. Using idealized high-resolution simulations with both mesh-based and particle-based gravito-hydrodynamics codes, we find that DMDGs can form as high-velocity galaxy collisions and separate dark matter from the warm disk gas, which subsequently is compressed by shock and tidal interaction to form stars. Then using the large simulated universe IllustrisTNG, we discover a number of high-velocity galaxy collision events in which DMDGs are expected to form. However, we did not find evidence that these types of collisions actually produced DMDGs in the TNG100-1 run. We argue that the resolution of the numerical experiment is critical to realizing the “collision-induced” DMDG formation scenario. Our results demonstrate one of many routes in which galaxies could form with unconventional dark matter fractions.</jats:p

Sorghum cobalt analysis on not determined wave length with atomic absorption spectrophotometer on background correction mode

This study was to know the better wave length on measuring cobalt content in forage sorghum hybrid (Sorghum bicolor) with an atomic absorption spectrophotometer. The analysis was on background correction mode with three wave lengths; 240.8, 240.7 (determined wave length or recommended wave length) and 240.6 nm, respectively. The larger absorbance value on the 240.7 nm, apparently, it might be considered as a good wave length but the smaller background value was a more important factor for the analysis as was shown on 240.6 nm. Correlation coefficients between the values on 240.7 nm: 240.6 nm and between them (240.8 nm: 240.6 nm) were higher and this common 240.6 nm was considered the better wave length.Key words: Atomic absorption spectrophotometer; background correction mode, cobalt analysis, forage sorghum, not determined wave lengths