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Myoung-Jae Lee,Chang Bum Lee,Dongsoo Lee,Seung Ryul Lee,Jihyun Hur,Seung-Eon Ahn,Man Chang,Young-Bae Kim,U-In Chung,Chang-Jung Kim,Dong-Sik Kim,Hosun Lee IEEE 2010 IEEE electron device letters Vol.31 No.7
<P>An alternative approach of controlling bistable resistance switching in NiO was investigated. By fabricating a multilayer structure of three NiOx layers with varying oxygen content, bistable resistance switching could be localized. By varying the enveloping oxygen partial pressure during NiOx layer deposition from 10% to 30%, improved resistance and switching voltage distribution from cycle to cycle was achieved. In addition, more localized switching could emulate sub-100-nm-sized cells showing decreased reset current values on the order of 100 A. X-ray photon spectroscopy analysis shows a clear grading near the interfaces of successive NiO layers.</P>
Torque Sensor based Robot Arm Control using Disturbance Observer
Hosun Lee,Yonghwan Oh,Jae-Bok Song 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
In this paper, a robust torque control method is proposed for a robot arm which is equipped with joint torque sensor. The proposed controller is used to control the joint torque and make it to be equal with the torque controller reference input torque. A flexible joint robot model will be introduced to model the robot arm system. The disturbance observer scheme is used to reduce the disturbance effects on the system. The PI torque controller is implemented using the characteristics of disturbance observer. The performance of the proposed controller is demonstrated through experiments with a one degree of freedom robot arm.
Hosun Lee,Shin Ok Koh,Moo Suk Park 한국영양학회 2011 Nutrition Research and Practice Vol.5 No.5
The beneficial effects of total parenteral nutrition (TPN) in improving the nutritional status of malnourished patients during hospital stays have been well established. However, recent randomized trials and meta-analyses have reported an increased rate of TPN-associated complications and mortality in critically ill patients. The increased risk of complications during TPN therapy has been linked to the development of hyperglycemia, especially during the first few days of TPN therapy. This retrospective study was conducted to determine whether the amount of dextrose from TPN in the 1st week in the intensive care unit (ICU) was related to the development of hyperglycemia and the clinical outcome. We included 88 non-diabetic critically ill patients who stayed in the medical ICU for more than two days. The subjects were 65±16 years old, and the mean APACHE (Acute Physiology and Chronic Health Evaluation) Ⅱ score upon admission was 20.9±7.1. The subjects received 2.3±1.4 g/kg/day of dextrose intravenously. We divided the subjects into two groups according to the mean blood glucose (BG) level during the 1st week of ICU stay: < 140 mg/dl vs ≥140 mg/dl. Baseline BG and the amount of dextrose delivered via TPN were significantly higher in the hyperglycemia group than those in the normoglycemia group. Mortality was higher in the hyperglycemia group than in the normoglycemia group (42.4% vs 12.8%, P = 0.008). The amount of dextrose from TPN was the only significant variable in the multiple linear regression analysis, which included age, APACHE Ⅱ score, baseline blood glucose concentration and dextrose delivery via TPN as independent variables. We concluded that the amount of dextrose delivered via TPN might be associated with the development of hyperglycemia in critically ill patients without a history of diabetes mellitus. The amount of dextrose in TPN should be decided and adapted carefully to maintain blood glucose within the target range.
Optical Study of ZnO and Zn_(1-x)Mg_(x)O Thin Films Grown on Sapphire substrate
Lee, Hosun,Kang, T. D.,Park, W. I.,Yi, G. C. 경희대학교 자연과학종합연구원 2002 자연과학논문집 Vol.8 No.-
We grew ZnO and Zn_(1-x)MgxO thin films on sapphire substrate by metal-organic vapor epitaxy and measured pseudo-dielectric functions using variable angle spectroscopic ellipsometry. We analyzed the pseudo-dielectric functions using multi-layer model. The dielectric functions of ZnO and Zn_(1-x)Mg_(x)O were fitted using Holden's model dielectric function. We used anisotropic layer modeling for ZnO, whereas we approximated isotropic payer modeling for Zn_(1-x)Mg_(x)O alloys. In terms of the amplitude of dielectric function, ZnO thin film showed the best optical quality.
Avoidable Causes of Delayed Enteral Nutrition in Critically Ill Children
Lee, Hosun,Koh, Shin Ok,Kim, Hyungmi,Sohn, Myung Hyun,Kim, Kyu-Earn,Kim, Kyung Won The Korean Academy of Medical Sciences 2013 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.28 No.7
<P>To evaluate the incidence of delayed enteral nutrition (EN) and identify avoidable causes of delay, we retrospectively reviewed medical records of 200 children (median age [range]; 37.5 [1-216] months) who stayed in the intensive care unit (ICU) for a minimum of 3 days. Among 200 children, 115 received EN following ICU admission with a median time of EN initiation of 5 days after admission. Of these, only 22 patients achieved the estimated energy requirement. A significant decrease in the final <I>z score</I> of weight for age from the initial assessment was observed in the non-EN group only (-1.3±2.17 to -1.57±2.35, <I>P</I><0.001). More survivors than non-survivors received EN during their ICU stay (61.2% vs 30.0%, <I>P</I>=0.001) and received EN within 72 hr of ICU admission (19.8% vs 3.3%, <I>P</I>=0.033). The most common reason for delayed EN was gastrointestinal (GI) bleeding, followed by altered GI motility and hemodynamic instability. Only eight cases of GI bleeding and one case of altered GI motility were diagnosed as active GI bleeding and ileus, respectively. This study showed that the strategies to reduce avoidable withholding EN are necessary to improve the nutrition status of critically ill children.</P>
Lee, Chungyeol,Chang, Dae Ryun,Kim, Nayeon,Lee, Hosun Korean Marketing Association 2016 ASIA MARKETING JOURNAL Vol.17 No.4
Do corporate social responsibility (CSR) initiatives lead to positive outcomes for companies? Although it is commonly accepted that CSR is a necessary component of modern marketing communication, the empirical evidence shows that that is not always the case. If CSR is sometimes not conducive to better marketing, it behooves firms to determine the right conditions that foster more effective CSR. It is in that vein that this study aims to add to the growing body of marketing and CSR literature through a series of experiments that examines the dynamics between prior attitude toward the company, the fit between the company and the CSR cause, and consumers' accessible thoughts. This study finds that the prior corporate reputation has an impact on how consumers evaluate the CSR activities of companies. Moreover, we show that the degree of accessible thoughts and their valence can change the moderating effect of the fit between the company and the CSR cause. This is because negative information is perceived as being more diagnostic than positive information in an evaluation situation. We demonstrate that companies that have lower prior public reputations can improve the evaluation of their CSR activities in two major ways: (1) by finding CSR causes that have a lower fit with their business, or (2) by providing information that allow consumers to access more positive thoughts about the CSR activity.
Characterization of Strained Silicon-Germanium Alloys Using Spectroscopic Ellipsometry
Lee, Hosun 경희대학교 자연과학종합연구원 1996 자연과학논문집 Vol.2 No.-
We have measured the pseudo-dielectric functions of strained Si_(1-x)Ge_(x)(0.l2≤x≤0.45) alloys grown on Si substrates using spectroscopic ellipsometry. The E_(l), E_(l)+△_(1) and E'_(0) gaps were determined performing lineshape fitting analysis on the second derivative spectra of the pseudo-dielectric functions. The change of these higher gaps were studied as a function of the Ge compositions. Compared to the E_(l) gap of relaxed SiGe/Si reported in literature, our data show that the E_(l) gap decreases with the increasing strain although classical elasticity theory predicts the increase of the E_(l) gap based on the available values of the deformation potentials of silicon and germanium. We discuss the discrepancy.
Nutrition Intervention Process for Heart Failure Patients according to Their Nutritional Problems
( Hosun Lee ),( Suk Yong Jeong ),( Hae Ryeon Choi ),( Seok-min Kang ) 한국임상영양학회 2021 Clinical Nutrition Research Vol.10 No.2
Patients with heart failure (HF) need nutritional management such as sodium restriction and healthy eating habits to relieve symptoms and to manage chronic disease. This case study examined 3 patients who had different nutritional problems and responded positively to the nutrition management program. Patient 1 and 2 had high levels of energy intake and were obese. Patient 1 had a habit of irregular binge eating and frequently consumed sweetened snacks and fast foods. He was advised to eat regular 3 meals per day with balanced food choices. He decreased his energy consumption to the recommenced intake and his body mass index had dropped to 22.9 kg/m<sup>2</sup> by his second follow-up visit. Patients 2 ate 3 meals regularly but ate a large amount of food. Although he decreased his energy intake to 97% of the recommended intake, he should be advised to increase his protein intake at the 1st follow-up session because he decreased his protein intake less than 90% of the recommended amount. Patient 3 reduced food intake by half due to dyspnea caused by HF before hospitalization, but symptoms improved after discharge and his energy as well as sodium intake increased. In the second follow-up, his nutritional diagnosis was excessive sodium intake and nutritional intervention was performed to reduce sodium intake. This study showed that additional nutritional problems might arise throughout the nutritional intervention process. Therefore, follow-up nutritional counseling should be held to evaluate the compliance with the nutrition management guidelines and to decide whether additional nutrition problems are suggested.