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Jeonghwan Lee 인문사회과학기술융합학회 2017 예술인문사회융합멀티미디어논문지 Vol.7 No.8
This study attempts to calculate R&D efficiency of patent applications and patent grants by analyzing 18 government-supported research institutes in Korea. Then, we focus on evaluating which external socioeconomic factors affect R&D efficiency. We analyzed efficiency determinants by ruling out inputs directly affecting the efficiency of patent application and patent grants using the Tobit regression method. The results showed that the important determinants affecting the efficiency of patent applications and grants positively are those belonging to the Research Council of Industry Technology, and a higher number of patent grants for the past five years. But the number of years of service for CEOs and the number of years since establishment did not derive statistically significant results for the efficiency of patent applications and grants. A higher number of part-time employees in total full-time workers did not exhibit statistically significant results in efficiency of patent grants, even though it had a positive impact on efficiency of patent applications.
Effects of RESET Current Overshoot and Resistance State on Reliability of RRAM
Jeonghwan Song,Daeseok Lee,Jiyong Woo,Yunmo Koo,Euijun Cha,Sangheon Lee,Jaesung Park,Kibong Moon,Misha, Saiful Haque,Prakash, Amit,Hyunsang Hwang IEEE 2014 IEEE electron device letters Vol.35 No.6
<P>Current overshoot has severe effects on the reliability of resistive random access memory (RRAM). It is well known that the current overshoot during the SET process is caused by parasitic capacitance. In this letter, we observed a different type of current overshoot during the RESET process. The RESET current overshoot was confirmed to have severe effects on the endurance of RRAM. We also demonstrated the relation between the current overshoot and the intrinsic capacitive elements of each state of RRAM. Finally, an optimized pulse shape was proposed to minimize the current overshoot and was experimentally verified to significantly improve the variability and endurance in a typical RRAM device with a W/Zr/HfO<SUB>2</SUB>/TiN structure.</P>
( Jeonghwan Lee ),( Seong Woo Lee ),( Jae Wook Lee ),( Ho Jun Chin ),( Kwon Wook Joo ),( Yon Su Kim ),( Curie Ahn ),( Suhnggwon Kim ),( Jeong Yeon Cho ),( Jin Suk Han ) 대한신장학회 2012 Kidney Research and Clinical Practice Vol.31 No.3
Background: Acute renal failure (ARF) with severe loin pain and patchy renal vasoconstriction (PRV) is a syndrome presenting with sudden loin pain after anaerobic exercise. We aimed to investigate the clinical characteristics and the efficacy of diagnostic imaging studies of patients with this syndrome. Methods: We retrospectively selected 17 patients with ARF accompanied by loin or abdominal pain who showed multiple patchy wedge-shaped delayed contrast enhancements on a computerized tomography scan. Information about the clinical characteristics, including the nature of pain and combined symptoms, suspected causes, such as exercise, drug or alcohol intake, and renal hypouricemia, and the results of laboratory and imaging tests were gathered. Results: The mean age of patients with episodes of ARF accompanied by loin pain was 23.0±6.5 (range 16-35) years old. Pain was mainly located in the loin (70.6%) or abdominal area(76.5%) and continued for approximately 3.5±4.0 days. Exercise was suspected as a primary cause of disease in 12 (70.6%) patients. Maximal serum creatinine was 5.42±3.16 (1.4-12.1)mg/dL3.1±1.8 (1-7) days after the onset of pain. The peak level of serum uric acid was 9.41±2.91 (6.0-15.8) mg/dL. All of the patients recovered to near-normal renal function, and one patient showed hypouricemia after recovery. Conclusion: ARF with severe loin pain and PRV can present with loin or abdominal pain, even without a history of anaerobic exercise. Careful history taking and appropriate imaging studies are critical in the diagnosis and management of this syndrome.
Jeonghwan Hwang,Weon Shik Han,Sungwook Choung,Wonwoo Yoon 대한지질학회 2021 대한지질학회 학술대회 Vol.2021 No.10
Immobilization of dissolved Cs<SUP>+</SUP> is dominantly affected by geochemical sorption to illitic clays in aquifer environments. The illitic clays have multiple sorptive sites (e.g., frayed edge, type II, and planar sites), which cause variable Cs<SUP>+</SUP> immobilization. This study investigated the sorption capacities and contributions of multiple sorptive sites on illitic clays under various competing K<SUP>+</SUP> (DIW–1.0×10<SUP>-1</SUP> mol/L) and Cs<SUP>+</SUP> concentrations (1.0×10<SUP>−7</SUP>–1.0×10<SUP>−3</SUP> mol/L). Experimental results revealed that 10 illitic clays had diverse sorption isotherms for Cs<SUP>+</SUP> with varying Langmuir-Qmax (0.009–0.033 eq/kg). In addition, the competing K<SUP>+</SUP> disrupted Cs<SUP>+</SUP> sorption to illitic clays, decreasing Kd,Cs in the order of DIW<1.0×10<SUP>−3</SUP><1.0×10<SUP>−1</SUP> mol/L of K<SUP>+</SUP>. Multisite cation exchange model confirmed that the amount of sorbed Cs<SUP>+</SUP> was significantly linked to sorption capacities of multiple sorptive sites: frayed edge sites (2.30×10<SUP>−6</SUP>–1.06×10<SUP>−4</SUP> eq/kg), type II sites (2.30×10<SUP>−4</SUP>–4.80×10<SUP>−3</SUP> eq/kg), and planar sites (8.60×10<SUP>−3</SUP>–3.13×10<SUP>−2</SUP> eq/kg). The frayed edge sites predominantly sorbed Cs<SUP>+</SUP> at low Cs<SUP>+</SUP> concentrations, whereas the type II and planar sites contributed to Cs<SUP>+</SUP> sorption at relatively high concentrations. According to 1-D cation exchange transport simulations, the retardation factors ranged 1.26–125.78 depending on the types and capacities of multiple sorptive sites, implying that the sorption of individual sorptive sites plays an important role to Cs<SUP>+</SUP> immobilization in actual radioactive contamination sites.
( Jeonghwan Lee ),( Yong Chul Kim ),( Soie Kwon ),( Lilin Li ),( Sohee Oh ),( Do Hyoung Kim ),( Jung Nam An ),( Jang-hee Cho ),( Dong Ki Kim ),( Yong-lim Kim ),( Yun Kyu Oh ),( Chun Soo Lim ),( Yon Su 대한신장학회 2020 Kidney Research and Clinical Practice Vol.39 No.4
Background: The effect of each health-related quality of life (HRQOL) component on hemodialysis prognosis has not been well studied. We aimed to investigate the clinical factors associated with HRQOL and the effect of HRQOL after dialysis initiation on long-term survival in an Asian population. Methods: A total of 568 hemodialysis patients were included from a nationwide prospective cohort study. HRQOL was evaluated using the Kidney Disease Quality of Life (KDQOL) Short FormTM 1.3 at 3 months after dialysis initiation. The effect of each KDQOL item score on mortality was analyzed. Multivariable Cox analysis was performed after adjusting for age, sex, modified Charlson comorbidity index, and causes of primary kidney disease. Results: Old age, diabetes mellitus, high comorbidities, and low serum albumin levels were associated with poor physical health status. Decreased urine output was associated with both poor physical and mental health status. The scores of 3 indices in the kidney disease domain (effect of kidney disease, social support, and dialysis staff encouragement) showed significant associations with mortality, as did the 3 indices (physical function, physical role limitation, and body pain) in the physical health domain. Neither the 4 indices in the mental health domain nor the mental composite score showed a significant association with mortality. However, a high physical composite score was associated with decreased overall patient mortality (P = 0.003). The effect of physical composite score on survival was prominent among young or middle-aged groups. Conclusion: Poor physical health status 3 months after hemodialysis start correlates significantly with overall mortality.
THE EFFECT OF HYBRD MOBILE ENGINEERS ON POST-ACQUISITION KNOWLEDGE INTEGRATION
Jeonghwan Lee,Seungho Choi 한국인사조직학회 2017 한국인사ㆍ조직학회 발표논문집 Vol.2017 No.1
Acquisitions can be viewed as a way of capturing scarce, firm-specific resources whose services are difficult to sell in intermediate markets. This paper suggests a unique group of mobile engineers who departed from the acquiring firms to target firms or vice versa prior to acquisitions and then they interact their previous firms due to acquisitions. We refer to them as hybrid mobile engineers. We address how hybrid mobile engineers affect post-acquisition knowledge integration between acquiring and target firms. We find that the relational capitals of hybrid mobile engineers promote post-acquistion knowledge integration. Our findings do not support the positive relationship between their intellectual capitals and post-acquistion knowledge integration. In addition, the structural integratio positively moderates the relationship between the intellectual and relational capitals of hybrid mobile engineers and knowledge integration after acquisitions. The findings of this paper imply that hybrid mobile engineers is an important mechanism to intergae knowledge and people between target and acquiring firms.
The Effects of Human Mobility on Joint Knowledge Creation in High-technology M&As
Jeonghwan Lee,Namgyoo K. Park 한국전략경영학회 2013 한국전략경영학회 학술대회발표논문집 Vol.2013 No.11
This study examines how human mobility between two companies before M&As affect joint knowledge creation. We investigate the effect of mobility direction and human assets on joint knowledge creation by using the data of all 182 M&As events and 693 mobile engineers for the period 1973-2009. We predicted that mobile engineers in the focal firms involved in M&As at the firm level will play an important role as agents of joint knowledge creation since they experienced both organization routines involved in the M&A. However, there are no significant results showing the relationship between the number of mobile engineers in two companies and joint knowledge creation. Nevertheless, the firm-level intellectual and relational assets that mobile engineers accumulated in their previous firms have positive impacts on joint knowledge creation. This study also shows that both the number and the firm-level intellectual assets of mobile engineers from the acquiring firm to the target make greater contributions to joint knowledge creation compared to the number and firm-level intellectual assets of engineers who moved from the target to the acquirer. Nonetheless, there is no difference in the contribution made between firm-level relational assets with different mobility direction. This shows that relational assets are important in maintaining strong relationships and increasing joint knowledge creation regardless of mobility direction.