Hwan Jin Kim | Korea University of Technology and Education (original) (raw)

Drafts by Hwan Jin Kim

This paper explores the motivations of firms to form technological alliances by testing the compa... more This paper explores the motivations of firms to form technological alliances by testing the comparative effects of social networks and absorptive capacity on partner selection, governance and alliance performance. Our results show that absorptive capacity has a greater impact on technological alliance partner selection than social networks. Moreover, while absorptive capacity had a significant impact on technological alliance performance neither absorptive capacity nor social networks were found to significantly affect the choice of technological alliance governance structure. From this, we posit the primary motivation for forming technological alliances among Korean high-tech SMEs is to increase firm absorptive capacity.

This paper examines the impact of two main alliance motivation theories, transaction cost economi... more This paper examines the impact of two main alliance motivation theories, transaction cost economics (TCE) and resource based view (RBV), on alliance processes among Korean manufacturing high-tech ventures. Results show that TCE and RBV are complimentarily explaining the formation of inter-firm alliances. TCE variables are more related with alliance partner characteristics while RBV is more linked with partner capabilities. Both show positive effects on performance. No significant effect is found on determining an alliance governance structure. While selecting appropriate technological alliance partners show positive effects on performance, no significant effect is found between alliance governance structure and performance. Factors of both theories impacting each alliance stage and analytical explanations of such impacts are discussed.

This paper examines governance structures influenced by relational and performance risk in interf... more This paper examines governance structures influenced by relational and performance risk in interfirm alliances. Risk perspectives and transaction cost economics (TCE) generate conflicting hypotheses about predicting alliance governance structures. In a highly risky situation, TCE suggests protective governance mechanisms such as equity joint ventures, whereas risk perspectives suggest more flexible mechanisms such as contract-based alliances. Hypotheses are formulated based on risk perspectives; next, they are empirically tested using 3,228 alliance data records generated during the past 5 years for high-tech industries. The results suggest that risk perspectives provide a better rationale than TCE for choosing an alliance governance structure in a high-tech industry. In the conclusion, we discuss critical issues in current debates about predicting alliance governance structures.

Although entrepreneurial orientation (EO) has been shown to play a key role in increasing firm pe... more Although entrepreneurial orientation (EO) has been shown to play a key role in increasing firm performance (FP), the effects of EO have been extremely oversimplified. The plethora of empirical studies on EO and FP suggest that the EO-FP relationship is linearly positive regardless of the amount of EO investment. The results show that EO increases FP at the bounded level (i.e., an inverted U-shape). We argue that the excessive use of EO and organizational incapability may contribute to the non-linearity of such effects. We also find that highly dynamic environments enhance the EO-FP relationship. We present prescriptive implications to practitioners on the antecedent conditions for EO practices.

Purpose – Entrepreneurial orientation (EO) and dynamic capabilities (DCs) are two important pilla... more Purpose – Entrepreneurial orientation (EO) and dynamic capabilities (DCs) are two important pillars of increasing performance in fast-changing environments. However, little is known about how the effects of EO and DCs on performance are reconciled, integrated and balanced in terms of contingency factors. In this study, the authors examine three contingencies – firm, market and product characteristics – that significantly affect the level of EO and DCs that firms pursue. Design/methodology/approach – Using survey data on 252 Korean manufacturing SMEs, this study analyzes the influence of EO and DCs on performance using hierarchical regression models. Findings – The results show that EO plays a critical role in small and young firms' performance but that DCs are more critical in incumbent firms. Further, both EO and DCs enhance performance in dynamic markets, and EO increases performance under radical product development, while DCs show negative effects. Originality/value – Given the importance of EO and DCs in increasing firm performance, a lack of empirical attempts have been made to reconcile the effects of EO and DCs in a single research setting. This study provides important and unique implications that can bridge the empirical gaps regarding the complementary roles of EO and DCs by exploring three contingency factors – firm, market and product characteristics – with respect to firm performance.

Papers by Hwan Jin Kim

ABSTRACT In multicore processor, managing shared last level cache is important for overall system... more ABSTRACT In multicore processor, managing shared last level cache is important for overall system performance. Cache contention incurred by OS page caches is serious since the page caches are usually large but less likely reused. The non-reusable page caches, however, pollute the last level cache and interfere the performance of co-running memory-intensive applications. In this paper, we propose a new page cache management scheme which is aimed at minimizing cache pollution incurred by the non-reusable page caches. We identify the non-reusable page caches from a priori information of applications that read page caches once and are unlikely to be access them again. The page caches allocated by the applications are isolated from the other memory data by page coloring, a well-known cache partitioning technique. The isolation guarantees no cache pollution incurred by the non-reusable page caches. The evaluation of our prototype in Linux 2.6.39 showed that cache pollution by non-reusable page caches is successfully alleviated while reducing cache misses by up to 76%. The minimized cache pollution leads to the execution time reduction by up to 50% in our tested cases.

Medical Physics, Jun 1, 2014

To investigate whether tropical cyclones (TCs) are simulated correctly and verify forecast skill ... more To investigate whether tropical cyclones (TCs) are simulated correctly and verify forecast skill for TCs in numerical weather prediction models, it is necessary to derive trajectories of TCs from model output data and compare them with TC best track information. Because TC tracks are not model output variables, they can be diagnosed from basic variables as pressure, wind, and temperature of a model. A method to decide the TC center is to find out the center manually by looking at the weather charts. However, this manual method is not efficient and sometimes impossible to pinpoint the TC center. Furthermore, determining TC center manually from ensemble prediction results becomes increasingly inefficient. Thus an objective analysis of TC center and trajectory becomes an indispensable work. In this study, a TC tracker that has been developed (hereafter YSU TC tracker) for various model output format including netCDF used in WRF, binary data used in MM5, and GRIB used in GFS and ECMWF YOTC, with various projection including Lambert conformal and cylindrical equidistant (lat/lon) grid is applied for the model output to investigate the performance of the tracker. In detecting step, YSU TC tracker used mean sea level pressure, vorticity and geopotential height at 700 and 850hPa. In tracking step, a search area of next forecast time is determined with specified radius around TC center position of the next forecast time, guessed by using thresholds of cyclone movement such as direction, range of angle, and search radius based on TC speed between two consecutive analyses. The YSU TC tracker developed above was applied on the TCs occurred in 2008 in North Western Pacific. As a forecast data, 0.5° by 0.5° resolution NCEP GFS and ECMWF YOTC data on cylindrical equidistant grid were used. To investigate the performance of the YSU TC tracker, the YSU TC tracker was applied to the GFS data and the results are compared with those from the NCEP tracker. Average track positional errors from the best track data were similar for both trackers, implying that the YSU TC tracker performs as well as the NCEP tracker. To investigate the average forecast skill of the NCEP GFS and ECMWF YOTC data, the YSU TC tracker was applied on both data. The average track positional errors for both data were similar at the initial time, but the average track positional error of the NCEP GFS becomes larger than that of ECMWF YOTC data as the forecast time increases. More comprehensive results will be presented in the meeting.

Neuromuscular Disord, 2007

The mean heat flow in Korea estimated in 365 locations (mines, coal fields, groundwater, hot spri... more The mean heat flow in Korea estimated in 365 locations (mines, coal fields, groundwater, hot spring wells) is 60 ± 11 mW/m2; mean geothermal gradients is 25.1 °C/km. High heat flow values appear in the southeastern part, the central western part, and the northeastern part of Korea. In the tectonic provinces, heat flow is 66 mW/m2 for Gyeonggi Massif, 65 mW/m2 for Okcheon Fold Belt, 60 mW/m2 for Yeongnam Massif, 72 mW/m2 for Gyeongsang Basin, and 75 mW/m2 for Yeonil Basin. In the aspect of the lithology, heat flow is 71 ± 2 mW/m2 for the sedimentary rock area, 68 ± 2 mW/m2 for the sedimentary/volcanic rock area, 67 ± 1 mW/m2 for the plutonic rock area, and 62 ± 2 mW/m2 for the metamorphic rock area. In the geological time sequence, heat flow is 78 ± 5 mW/m2 for the Cenozoic strata, 68 ± 1 mW/m2 for Mesozoic, 65 ± 3 mW/m2 for the Paleozoic strata, 67 ± 8 mW/m2 for the Proterozoic strata, and 62 ± 2 mW/m2 for the Archean strata. From the relationship between heat flow and Moho depth, we found that the shallow Moho depth area is likely to have higher heat flow values than the area of the thick crust. Heat production was measured by chemical analysis and gamma-ray logs on basement rocks (86 granite and 37 gneiss samples). The mean heat production is 2.15 μW/m3 for granite, and 2.22 μW/m3 for gneiss. The mean heat production is 2.52 μW/m3 for Gyeonggi Massif, 2.16 μW/m3 for Okcheon Fold Belt, 2.35 μW/m3 for Yeongnam Massif, and 2.01 μW/m3 for Gyeongsang Basin. The tectonic provinces with high mean heat flow tend to have low mean heat production. Therefore, heat production is unlikely to have a first-order importance in determining surface heat flow distribution in Korea. The analysis of 12 heat production and heat flow data sets from granite area in Gyeongsang Basin shows a linear relationship between heat production and surface heat flow, which is known as q=qr+AD, where q is surface heat flow, qr is reduced heat flow, A is heat production, and D is characteristic depth. We found q=47.06+12.29A for Gyeongsang Basin.

Acs Nano, May 11, 2012

Although oxide nanowires offer advantages for next-generation transparent display applications, t... more Although oxide nanowires offer advantages for next-generation transparent display applications, they are also one of the most challenging materials for this purpose. Exposure of semiconducting channel areas of oxide nanowire transistors produces an undesirable increase in the photocurrent, which may result in unstable device operation. In this study, we have developed a Zn(2)SnO(4) nanowire transistor that operates stably regardless of changes in the external illumination. In particular, after exposure to a light source of 2100 lx, the threshold voltage (V(th)) showed a negative shift of less than 0.4 V, and the subthreshold slope (SS) changed by ∼0.1 V/dec. ZnO or SnO(2) nanowire transistors, in contrast, showed 1.5-2.0 V negative shift in V(th) and an SS change of ∼0.3 V/dec under the same conditions. Furthermore, the Zn(2)SnO(4) nanowire transistors returned to their initial state immediately after the light source was turned off, unlike those using the other two nanowires. Thus, Zn(2)SnO(4) nanowires achieve photostability without the application of a black material or additional processing, minimizing the photocurrent effect for display devices.

The Korean Journal of Internal Medicine, 2010

Key Engineering Materials, Jul 9, 1998

Materials Letters, Nov 1, 1996

Cell Death Differentiation, 2006

Medical Physics, Jun 1, 2014

Neuromuscular Disord, 2007

Acs Nano, May 11, 2012

The Korean Journal of Internal Medicine, 2010

Key Engineering Materials, Jul 9, 1998

Materials Letters, Nov 1, 1996

Cell Death Differentiation, 2006

J Vasc Interven Radiol, 2009

This paper presents two of our recent developments in the area of III-V ternary and quaternary ma... more This paper presents two of our recent developments in the area of III-V ternary and quaternary materials growth technology for high efficiency thermophotovoltaic (TPV) cells. It is well recognized that growth of TPV cell materials from melts or solutions presents the most economical option. We have investigated bulk substrate growth from melt as well as epitaxial growth from liquid phase. In the bulk crystal growth area, we have been concentrating on the growth of 50 mm or larger diameter device quality ternary III-V substrates. In the epitaxial growth arena, we have developed a new thermochemistry for growing ternary and quaternary compounds on binary substrates from quaternary solutions. Some of the recent results pertaining to the bulk growth of GaInSb and epitaxial growth of GaInAs, InAsSb and GaInAsSb on GaAs substrates will be discussed here.

Exp Therm Fluid Sci, 2009