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Ki-Hwan Kwon,Nahm-Gyoo Cho 한국정밀공학회 2006 International Journal of Precision Engineering and Vol.7 No.1
A spectral analysis and numerical simulation are employed to assess the effects of the stylus tip radius on measuring surface profiles. Original profiles with fractal spectral densities are generated and then are numerically traced with circular tipped stylus. Instead of their spectral densities, the accumulative power spectrums of traced profiles are analyzed. It is shown that the minimum wavelength of traced profile relates directly to the radius r of the stylus tip and the root-mean-square (rms) roughness σo of original profile. From this accumulation spectral analysis, a formula is developed to estimate the minimum wavelength of traced profile. By using the concept of the minimum wavelength, an appropriate stylus tip radius can be chosen for the given rms roughness σo of the profile.
Outward Foreign Investment Policy in Korea: A Review on Policy Issues and Performance
Ki-Hwan Kwon 한국무역학회 2006 Journal of Korea trade Vol.10 No.3
Korea made substantial efforts to integrate its economy with more globalized economies during the 1990s. For its future competitiveness, every sphere of the Korean national economy has witnessed major policy changes to integrate the domestic economy with the cross-bordering economy. The outward foreign investment policy, among all of the domestic economic policy changes, has undergone a key transformation to enable Korean firms to go abroad. This paper traces the origin and evolution of Korean outward foreign investment policies over the last four decades in response to the changes in the global economy. Moreover, this paper describes the transformation of the role of the Korean government in three different phases and identifies the recent issues in outward foreign investment in Korea.
Ki Hwan Kwon,Ji Ae Lee,임윤정,Beom Jae Lee,Moon Kyung Joo,Yu Ra Sim,Wonjae Choi,Taehyun Kim,Ji Yoon Kim,Ei Rie Cho,진윤태,Jong-Jae Park 대한내과학회 2020 The Korean Journal of Internal Medicine Vol.35 No.4
Background/Aims: Oral sulfate solution (OSS) is an emerging cleansing agent for bowel preparation. However, data comparing OSS to other conventional bowel preparations in Asian patients are limited. Therefore, the objective of this study was to compare the efficacy and tolerability of OSS to ascorbic acid plus polyethylene glycol (AA + PEG) in Asian patients. Methods: This was a prospective, randomized, parallel, investigator-blind study performed in two university hospitals in Korea. Bowel preparation efficacy was evaluated using both the Ottawa Bowel Preparation Scale (OBPS) and Boston Bowel Preparation Scale (BBPS). Results: Among 173 patients, 86 received OSS while 87 received AA + PEG for bowel preparation. Total OBPS score was 2.80 ± 2.48 in the OSS group and 4.49 ± 3.08 in the AA + PEG group, indicating significantly (p < 0.001) better efficacy with OSS. Total BBPS was higher in the OSS group (7.43 ± 1.49 vs. 6.51 ± 1.76, p < 0.001), indicating superior bowel preparation quality with OSS. Preparation-related adverse events were generally acceptable. Patients receiving OSS had more nausea (1.92 ± 0.94 vs. 1.54 ± 0.76, p = 0.004) and abdominal cramping (1.45 ± 0.78 vs. 1.17 ± 0.51, p = 0.006) than those receiving AA + PEG. However, overall satisfaction and taste were similar between the two groups. Conclusions: OSS had a non-inferior bowel cleansing efficacy than AA + PEG regardless of colon segment.
Clinical value of procalcitonin in patients with suspected nosocomial bloodstream infection
( Ki Hwan Kwon ),( Seong Yeon Park ),( Seok Lae Chae ),( Hee Jin Huh ),( Jae Woo Chung ) 대한내과학회 2015 대한내과학회 추계학술발표논문집 Vol.2015 No.1
Purpose: Procalcitonin (PCT) might be a useful marker to exclude bacteremia or to predict the severity of bloodstream infection (BSI). However, the ability of PCT levels to differentiate BSI from non-BSI episodes was not evaluated in patients with nosocomial BSI. Methods: We retrospectively reviewed 814 medical records of the patients with suspected BSI that developed more than 48 hours after hospital admission. PCT, C reactive protein (CRP), white blood cell (WBC) count and estimated glomerular filtration rate (eGFR) were obtained. Results: Of 814 patients, 134 (16.5%) had BSI episodes and 680 (83.5%) had non-BSI episodes. Serum PCT was significantly elevated in patients with BSI than non-BSI (7.11 18.96 vs 1.67±5.94, p <0.01), The optimal cutoff value was 0.27. At the cutoff value, the sensitivity of PCT was 74.6% (95% confidence iinterval[CI[: 66.4-81.7) specificity was 56.3% (95% CI: 52.7-60.2), positive predictive value was 25.3% (95% CI: 21.1-29.8), negative predictive value was 91.8% (95% CI: 88.8-94.3). The area under curve (AUC) of PCT (0.701) was significantly larger than those of CRP (0.566) or WBC (0.527). PCT is significantly higher in eGFR <60 (mL/min/1.73 m>2) group than eGFR≥60 group (4.99±13.72 vs 1.63±7.22, p<0.01), but no significant difference between 30<eGFR ≤ 60 group and eGFR ≤ 30 group (4.26±12.86 vs 5.73±14.54, p=0.42). Conclusions: Low serum PCT is useful biomarker to distinguish BSI from non-BSI in patients with suspected nosocomial BSI, however, renal function should be taken into account.