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양승필,고동훈 제주관광대학 2004 論文集 Vol.10 No.-
The purpose of this study is as follows; First, this study developed the instruments of measurement to measure the quality of HAS(information quality, system quality, and service quality). Second, this study investigated statistically perception differences of the quality by t-test between hotel employees in Jeju and those in Seoul. The hypotheses were developed from reviewing the former literatures and tested empirically. The Questionnaires were collected from 214 middle or higher managers at deluxe hotels located in Seoul and Jeju during February 13 to March 10,2004. This study was conducted using frequency analysis, descriptive analysis, and t-test by statistical packages of SPSS SPSSWIN version 10.0. The results of this study showed that hotel employees in Jeju perceived positively the quality of HAS than those in Seoul.
강승필,고봉수 제주대학교 사범대학 2001 백록논총 Vol.3 No.1
This paper discusses practical uses of the Black-Scholes formula or, more generally, the Black-Scholes Partial Differential Equation, as a tool for hedging an options portfolio. In those process, there are several parameter Delta, which is the derivative of the option value with respect to change in the price S of the underlying asset, Gamma, which is the derivative of the Delta with respect to S, Theta, which is the derivative of the option value with respect to the time, Vega, which is the derivative of the option value with respect to the volatility, and Rho, which is the derivative with respect to the short-term interest rate.
Ko, Seung-Pil,Shin, Jong Mok,Jang, Ho Kyun,You, Min Youl,Jin, Jun-Eon,Choi, Miri,Cho, Jiung,Kim, Gyu-Tae IOP 2018 Nanotechnology Vol.29 No.6
<P>Doping effects in devices based on two-dimensional (2D) materials have been widely studied. However, detailed analysis and the mechanism of the doping effect caused by encapsulation layers has not been sufficiently explored. In this work, we present experimental studies on the n-doping effect in WSe<SUB>2</SUB> field effect transistors (FETs) with a high-k encapsulation layer (Al<SUB>2</SUB>O<SUB>3</SUB>) grown by atomic layer deposition. In addition, we demonstrate the mechanism and origin of the doping effect. After encapsulation of the Al<SUB>2</SUB>O<SUB>3</SUB> layer, the threshold voltage of the WSe<SUB>2</SUB> FET negatively shifted with the increase of the on-current. The capacitance–voltage measurements of the metal insulator semiconductor (MIS) structure proved the presence of the positive fixed charges within the Al<SUB>2</SUB>O<SUB>3</SUB> layer. The flat-band voltage of the MIS structure of Au/Al<SUB>2</SUB>O<SUB>3</SUB>/SiO<SUB>2</SUB>/Si was shifted toward the negative direction on account of the positive fixed charges in the Al<SUB>2</SUB>O<SUB>3</SUB> layer. Our results clearly revealed that the fixed charges in the Al<SUB>2</SUB>O<SUB>3</SUB> encapsulation layer modulated the Fermi energy level via the field effect. Moreover, these results possibly provide fundamental ideas and guidelines to design 2D materials FETs with high-performance and reliability.</P>
Kyung-Pil Ko,Soon-Mi Choi,Jung-Woo Lee,Rock-Kil Ko,Seung-Hyun Moon,Chan Park,Sang-Im Yoo IEEE 2014 IEEE transactions on applied superconductivity Vol.24 No.6
<P>We tried to optimize the BaSnO<SUB>3</SUB> (BSO) doping content in GdBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7-δ</SUB> (GdBCO) coated conductors (CCs) on CeO<SUB>2</SUB>-buffered ion-beam assisted deposition (IBAD)-MgO templates. The BSO-doped GdBCO CCs with various x vol% ( x=0, 2, 3, 4, 5, and 6) relative to GdBCO were prepared at 800°C with the oxygen pressure of 300 mtorr by pulsed laser deposition (PLD), and their pinning properties were characterized by measuring magnetic hysteresis curves for the applied field parallel to the c-axis of GdBCO (B//c) up to 5 T and field-orientation dependence of transport critical currents for 1, 3, and 5 T at 65 and 77 K, respectively. Among all samples, a 5 vol% BSO-doped GdBCO CC exhibited the highest maximum pinning force density (F<SUB>p,max</SUB>) values of 32.5 GN/m<SUP>3</SUP> near 4 T at 65 K and 6.5 GN/m<SUP>3</SUP> near 3.2 T at 77 K, for B//c (θ = 180 <SUP>°</SUP>), and also the highest minimum transport critical current density (Jc,min) of 0.39 MA/cm<SUP>2</SUP> at 77 K in 1 T and 0.68 MA/cm<SUP>2</SUP> at 65 K in 3 T, for θ = 120<SUP>°</SUP>, evidencing that 5 vol% is the optimum BSO content. Observation of BSO-doped GdBCO CCs by transmission electron microscopy revealed that the effective flux pinning of BSO-doped GdBCO CC was attributed to the BSO nanorods of ~ 10-nm diameters roughly aligned along the c-axis of the GdBCO matrix.</P>
Kyoung-Pil Ko,Rock-Kil Ko,Sung-Yun Lee,Ho-Kyum Kim,Seung-Hyun Moon,Sang-Soo Oh,Sang-Im Yoo IEEE 2009 IEEE transactions on applied superconductivity Vol.19 No.3
<P>We report a successful fabrication of GdBa2Cu3O7-delta (GdBCO) coated conductor on the ion-beam assisted deposition (IBAD) MgO template with a new buffer layer of BaZrO3 (BZO). The BZO films were deposited on the IBAD-MgO template at various substrate temperatures (T-S) and oxygen partial pressures (PO2) by pulsed laser deposition (PLD). In the broad ranges of T-S and PO2, all BZO layers showed almost uniform in-plane texture (Delta phi of similar to 6 degrees), implying that BZO is an attractive buffer layer. The surface roughness of BZO layer was sensitive to PO2 but not to T-S. On the optimally processed BZO buffer layer with 5.1 nm RMS roughness, GdBCO coated conductor deposited at T-S of 750 degrees C and PO2 of 400 mTorr exhibited Delta phi of 4.4 degrees, T-c,T-zero of 90.3 K, and J(c) of 1.35 MA/cm(2) (77 K, self-field).</P>
Intake of Soy Products and Other Foods and Gastric Cancer Risk: A Prospective Study
Ko, Kwang-Pil,Park, Sue K.,Yang, Jae Jeong,Ma, Seung Hyun,Gwack, Jin,Shin, Aesun,Kim, YeonJu,Kang, Daehee,Chang, Soung-Hoon,Shin, Hai-Rim,Yoo, Keun-Young Japan Epidemiological Association 2013 Journal of epidemiology Vol.23 No.5
<P><B>Background</B></P><P>Gastric cancer, the most common cancer in the world, is affected by some foods or food groups. We examined the relationship between dietary intake and stomach cancer risk in the Korean Multi-Center Cancer Cohort (KMCC).</P><P><B>Methods</B></P><P>The KMCC included 19 688 Korean men and women who were enrolled from 1993 to 2004. Of those subjects, 9724 completed a brief 14-food frequency questionnaire at baseline. Through record linkage with the Korean Central Cancer Registry and National Death Certificate databases, we documented 166 gastric cancer cases as of December 31, 2008. Cox proportional hazard models were used to estimate relative risks (RRs) and 95% CIs.</P><P><B>Results</B></P><P>Frequent intake of soybean/tofu was significantly associated with reduced risk of gastric cancer, after adjustment for age, sex, cigarette smoking, body mass index, alcohol consumption, and area of residence (<I>P</I> for trend = 0.036). We found a significant inverse association between soybean/tofu intake and gastric cancer risk among women (RR = 0.41, 95% CI: 0.22–0.78). Men with a high soybean/tofu intake had a lower risk of gastric cancer, but the reduction was not statistically significant (RR = 0.77, 95% CI: 0.52–1.13). There was no interaction between soybean/tofu intake and cigarette smoking in relation to gastric cancer risk (<I>P</I> for interaction = 0.268).</P><P><B>Conclusions</B></P><P>Frequent soybean/tofu intake was associated with lower risk of gastric cancer.</P>
( Seung Won Jung ),( Moo Woong Kim ),( Soo Kyung Cho ),( Hyun Uk Kim ),( Dong Cheol Lee ),( Byeong Kab Yoon ),( Jong Pil Jeong ),( Young Choon Ko ) 대한결핵 및 호흡기학회 2013 Tuberculosis and Respiratory Diseases Vol.74 No.5
Aspergillus causes a variety of clinical syndromes in the lung including tracheobronchial aspergillosis, invasive aspergillosis, chronic necrotizing pulmonary aspergillosis, allergic bronchopulmonary aspergillosis, and aspergilloma. Aspergilloma usually results from ingrowths of colonized Aspergillus in damaged bronchial tree, pulmonary cyst or cavities of patients with underlying lung diseases. There are a few reports on endobronchial aspergilloma without underlying pulmonary lesion. We have experienced a case of endobronchial aspergilloma associated with foreign body developed in an immunocompetent patient without underlying lung diseases. A 59-year-old man is being hospitalized with recurring hemoptysis for 5 months. X-ray and computed tomography scans of chest showed a nodular opacity in superior segment of left lower lobe. Fiberoptic bronchoscopy revealed an irregular, mass-like, brownish material which totally obstructed the sub-segmental bronchus and a foreign body in superior segmental bronchus of the lower left lobe. Histopathologic examinations of biopsy specimen revealed fungal hyphae, characteristic of Aspergillus species.
A case of hemolytic uremic syndrome preceded by intussusception
Ko, Eun-Young,Kim, Joo-Young,Lee, Hye-Jin,Lee, Hyun-Seung,Han, Ji-Whan,Kim, Young-Hoon,Kim, Jin-Tack,Cheong, Hae-Il,Jang, Pil-Sang The Korean Pediatric Society 2011 Clinical and Experimental Pediatrics (CEP) Vol.54 No.4
Hemolytic-uremic syndrome (HUS) is the most common cause of acute renal failure in young children. It is classically characterized by the triad of microangiopathic hemolytic anemia, thrombocytopenia, and uremia. Further, not only is intussusception one of the differential diagnoses of HUS but it may also become a complication during disease progression. We report a case of HUS. preceded by intussusception in a previously healthy 17-month-old boy. The patient presented at the emergency department with bloody stools that developed the day after reduction of intussusception. HUS was diagnosed 4 days after the reduction of intussusception. The patient was provided only supportive care and his laboratory test findings were normal at discharge.
Ko, Bong-Soo,Kang, Seung-Pil Korean Mathematical Society 2007 대한수학회지 Vol.44 No.2
By variational methods, we prove the existence of positive solutions of a class of indefinite weight semilinear elliptic boundary value problems on critical Sobolev exponent.