Celay/In-Ceram, Conventional In-Ceram, Empress 2 전부도재관의 변연적합도에 관한 비교 연구

양재호,여인성,이선형,한중석,이재봉,Yang, Jae-Ho,Yeo, In-Sung,Lee, Sun-Hyung,Han, Jung-Suk,Lee, Jai-Bong 대한치과보철학회 2002 대한치과보철학회지 Vol.40 No.2

There have been many studies about marginal discrepancy of single restorations made by various systems and materials. But many of statistical inferences are not definite because of sample size, measurement number, measuring instruments. etc. The purpose of this study was to compare the marginal adaptations of the anterior single restorations made by different systems and to consider more desirable statistical methods in analysing the marginal fit. The in vitro marginal discrepancies of three different all-ceramic crown systems (Celay In-Ceram. Conventional In-Ceram. IPS Empress 2 layering technique) and one control group (PFM) were evaluated and compared. The crowns were made from one extracted maxillary central incisor prepared with a 1mm shoulder margin and $6^{\circ}$ taper walls by milling machine. 10 crowns per each system were fabricated. Measurements or a crown were recorded at 50 points that were randomly selected for marginal gap evaluation. Non-parametric statistical analysis was performed for the results. Within the limits of this study, the following conclusions were drawn: 1 Mean gap dimensions and standard deviations at the marginal opening for the maxillary incisor crowns were $98.2{\pm}40.6{\mu}m$ for PFM, $83.5{\pm}18.7{\mu}m$ for Celay In-Ceram, $104.9{\pm}44.1{\mu}m$ for conventional In-Ceram, and $45.5{\pm}11.5{\mu}m$ for IPS Empress 2 layering technique. The IPS Empress 2 system showed the smallest marginal gap (P<0.05). The marginal openings of the other three groups were not significantly different (P<0.05). 2 The marginal discrepancies found in this study were all within clinically acceptable standards ($100\sim150{\mu}m$). 3. When the variable is so controlled that the system may be the only one, mean value is interpreted to be the marginal discrepancy of a restoration which is made by each system and standard deviation is to be technique-sensitivity of each one. 4. From the standard deviations. the copy-milling technique (Celay/In-Ceram) was not considered to be technique-sensitive in comparison with other methods. 5. Parametric analysis is more reliable than non-parametric one in interpretation of the mean and standard deviation. The sample size of each group has to be more than 30 to use parametric statistics. The level of clinically acceptable marginal fit has not been established. Further studies are needed.

Protective Effects of N-acetylcystenine and Selenium against Doxorubicin Toxicity in Rats

Yeo-sung Yoon,Sun-don Kim,Min-hye Lee,Heung-shik S.Lee,In-se Lee,Je-kyung Sung,Eun-sung Park 대한수의학회 2003 Journal of Veterinary Science Vol.4 No.2

Effects of N-acetylcysteine and Selenium against Doxorubicin Toxicity in RatsEun-sung Park, Sun-don Kim1, Min-hye Lee, Heung-shik S. Lee, In-se Lee, Je-kyung Sung and Yeo-sung Yoon*

In-depth considerations for better polyelectrolytes as interfacial materials in polymer solar cells

Yeo, Jun-Seok,Kang, Minji,Jung, Yen-Sook,Kang, Rira,Lee, Seung-Hoon,Heo, Youn-Jung,Jin, Sung-Ho,Kim, Dong-Yu,Na, Seok-In Elsevier 2016 Nano energy Vol.21 No.-

<P><B>Abstract</B></P> <P>We perform a comprehensive study to achieve better polyelectrolytes (PEs) as electron-transport layers (ETLs) in polymer solar cells (PSCs). Three well-known PEs – PFN, PEIE, and WPF – are chosen as model systems and investigated with variations in their backbone structures and the state of the amine functionalities on their side chains. Respectively optimized PSCs using the three PEs exhibit different cell-performances, mainly owing to the diode characteristics of built-in potential and recombination strength. To identify how such deviated device-performances correlate with the structural features of PEs, the modulated interfaces of ITO/PEs and PEs/active layer are studied in detail. It is found that conjugated backbones and larger counter-anions on side chains can promote the modulation of ITO work functions (WFs) and that a large amount of protonated amines on PEs is beneficial for junction properties with a subsequent active layer. Additionally, our results indicate that interfacial dipole and electrical doping between the PE and active layer, in addition to WF modulation of the ITO cathode, are important for device efficiency. Accordingly, with the aid of the molecular features of PEIE, PEIE-PSCs exhibit excellent device efficiency and stability compared with PFN- and WPF-PSCs. In the PTB7-th:PC<SUB>71</SUB>BM system, a remarkable power-conversion efficiency of 9.97% is achieved with a single PEIE ETL.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Chemical structure and performance of polyelectrolytes (PEs) in PSCs are correlated. </LI> <LI> Interfacial dipole and doping between PEs and active layer lead to efficient PSCs. </LI> <LI> PEIE-based PSCs have excellent device efficiency and high stability. </LI> <LI> Especially, in the PTB7-th system, encouraging efficiency of 9.97% is achieved. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

초등학교 학생,예비 교사,현직 교사의 실험 기구 명칭과 용도에 대한 이해

여상인 ( Yeo Sang In ),이병문 ( Lee Byeong Mun ) 한국초등과학교육학회 2004 초등과학교육 Vol.23 No.1

This study was based upon the survey on the name of 13 basic experimental instruments used in elementary science class: Schale, evaporating dish, mortar & pestle, beaker, erlenmeyer flask, spuit(medicine dropper), graduated cylinder, balance, spatula, dropping bottle, gas collecting bottle, funnel, alcohol burner, and their uses. To implement this study, an open-ended, written questionnaire was administered to the subjects of in-service elementary school teachers, future elementary teachers who have attended at the Gyeongin national university of education, and elementary students in Korea. The findings of this study were as follows: The rates of in-service and pre-service elementary school teachers that knew correct name of experimental instruments were not high, the elementary school student`s rates were especially very low. In this study, we found several reasons which they wrote inaccurately: the name to be represented at the textbook that they had studied, the confusion of the name about a fortis pronunciation, the recognition as the vocabulary like flask and cylinder to be meaningless, the habit to say in an everyday life, wrong expression in the internet and general book. All respondents had a wide range of perceptions of uses for the experimental instruments. Their understanding of uses for evaporating dish, erlenmeyer flask, balance, gas collecting bottle were very poor. And then most of them understood that graduated cylinder, beaker, and erlenmeyer flask were tools to measure the volume of solution or liquid, so they did not exactly distinguish the difference of their uses.

스키 리조트 이용자의 여가갈등에 관한 연구

한우진(Woo Jin Han),이장희(Jang Hee Lee),여인성(In Sung Yeo) 한국여가레크리에이션학회 2005 한국여가레크리에이션학회지 Vol.29 No.-

Although various studies concerning leisure conflict have been conducted in the U.S, there is little research in this area for Korean. There are many both unasked and unanswered questions in the experience of leisure conflict between or among various leisure activity group. Therefore, an attempt to understand the experience of leisure conflict in ski resort between skier and snowboarder may provide new insights into the nature of leisure conflict of Korean. The purpose of this study was to examine differences of leisure conflict by demographic variables and investigated effect of user’s characteristics in leisure conflict between skier and snowboarder.For this study, 482 participants were selected from 2 ski resorts located in Kangwon Province for one month from January 15th to February 15, 2005, using the convenience sampling method. For the data analysis SPSS 12.0 for Windows version was utilized. The hypothesis tests were conducted with independent t-test, one-way ANOVA, and Multiple Linear Regression to solve problems of the study. On the basis of the results, the conclusions were drawn as follows; 1. There are differences in leisure conflict between or among skier and snowboarder’ demographic characteristics(gender and age group) 2. Leisure conflicts of skier are effected by user’s background in both in-group and out-group. 3. Leisure conflicts of snowboarder are effected by user’s background in both in-group and out-group.

변환된 자기회귀이동평균 모형에서의 예측구간추정

조혜민,오승언,여인권,Cho, Hye-Min,Oh, Sung-Un,Yeo, In-Kwon 한국통계학회 2007 응용통계연구 Vol.20 No.3

시계열자료를 분석하는데 있어 중요한 목적 중에 하나가 미래값에 대한 예측이다. 일반적으로 자기회귀이동평균모형에서는 백색잡음이 정규분포를 따른다는 가정 하에서 모수의 추론과 예측 및 예측구간의 추정이 이루어지고 있다. 그러나 자료가 이러한 가정을 만족하지 않는 경우, 자료를 가정에 맞게 변환시킨 후 분석하는 방법을 생각해 볼 수 있다. 이 논문에서는 변환된 자료를 분석하여 얻은 결과를 이용하여 본래의 척도에서의 미래값에 대한 예측구간을 추정하는 문제에 대해 알아본다. 제안하는 방법에서는 먼저 적절한 변환을 이용하여 자료를 정규가정을 만족하도록 변환시키고 변환된 자료를 이용하여 미래값에 대한 예측구간을 추정한 후, 역변환을 이용하여 예측구간을 추정한다. 이 논문에서는 시계열분석에서 모델링이 상대적으로 어려운 왜도의 문제를 해결하기 위해 Yeo-Johnson 변환을 중심으로 한 방법론을 소개한다. 모의실험 결과 제안된 방법에 의한 단측예측구간의 포함확률이 변환을 사용하지 않은 구간보다 명목수준에 가까운 것을 확인하였다. One of main aspects of time series analysis is to forecast future values of series based on values up to a given time. The prediction interval for future values is usually obtained under the normality assumption. When the assumption is seriously violated, a transformation of data may permit the valid use of the normal theory. We investigate the prediction problem for future values in the original scale when transformations are applied in ARMA models. In this paper, we introduce the methodology based on Yeo-Johnson transformation to solve the problem of skewed data whose modelling is relatively difficult in the analysis of time series. Simulation studies show that the coverage probabilities of proposed intervals are closer to the nominal level than those of usual intervals.

A Short-Channel TFT of Amorphous In–Ga–Zn–O Semiconductor Pixel Structure With Advanced Five-Mask Process

Joon-Young Yang,Sung-Hoon Jung,Chang-Seung Woo,Ju-Hyun Lee,Jung-Ho Park,Myung-Chul Jun,In-Byeong Kang,Sang-Deog Yeo IEEE 2014 IEEE electron device letters Vol.35 No.10

<P>We propose a new five-mask etch-stopper amorphous In-Ga-Zn-O semiconductor pixel structure for a high-resolution advanced-high-performance in-plane-switching (AH-IPS) display device. A short-channel length (under 5 μm) thin-film transistor (TFT) was successfully fabricated using a selfaligned damage preventing layer. The linear field effect mobility of the 4-μm channel length TFT was 10.4 cm<SUP>2</SUP>/V · s. Using the proposed structure, we successfully fabricated a 9.7-in AH-IPS quad-extended graphics array liquid-crystal displays panel.</P>

Creep Property and Correlation of Diffusion-Welded Alloy 800H Tubes for Printed Circuit Heat Exchangers and Steam Generators

Dong‑Ha Kim,Sunghwan Yeo,Jun‑Hwan Kim,In‑Jin Sah,Jong‑Bae Hwang,Sang‑ji Kim,Young‑Kook Lee 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.10

Thermal creep tests were conducted on diffusion-welded Alloy 800H tubes at 700 °C under various hoop stresses between 70 and 140 MPa using an in-situ creep measurement system. The tube-type creep specimens obtained from diffusion-welded Alloy 800H plates at 1150 °C and 10 MPa for 2 h achieved a uniform thickness with only 1.8% variation. The primary and secondary creep regimes were clear in the stain curves, while tertiary creep and subsequent material rupture were not observed due to the premature leakage of Ar gas at the interface of diffusion welding. The acquired creep strain data do not match well with the reference creep data of the Alloy 800H, which requires further work to explain the whole details. In such a context, a modified Garofalo correlation was used to fit the acquired creep data resulting in the meaningful parameters for primary creep strain and secondary creep rate. The Ar gas leakage at the interface of diffusion welding was confirmed by leakage test and microstructure investigations. The current study points to the requirement for a better diffusion welding process for Alloy 800H for use in printed circuit heat exchangers and steam generators.

서로 다른 형태의 임플란트의 식립토크가 골에 미치는 열변화에 관한 연구

김민호,여인성,김성훈,한중석,이재봉,양재호,Kim, Min-Ho,Yeo, In-Sung,Kim, Sung-Hun,Han, Jung-Seok,Lee, Jai-Bong,Yang, Jae-Ho 대한치과보철학회 2011 대한치과보철학회지 Vol.49 No.2

연구 목적: 임플란트 식립시에 발생할 수 있는 열변화는 임플란트의 실패를 초래할 수 있다. 식립토크에 따른 열변화 양상을 파악함으로 임플란트의 형태에 따른 차이점과 적절한 식립토크가 어떤 것인지 파악하고자 한다. 연구 재료 및 방법: 실험재료로는 두께 15 - 20 mm의 소 견갑골을 가로 35 mm, 세로 40 - 50 mm 크기가 되도록 골편으로 자르고 이중에 피질골의 두께가 2 - 3 mm 되는 표본을 선정한 후 표본의 반을 $36.5^{\circ}C$ 수조에 실온 $25^{\circ}C$에 노출 시켜 내부 온도는 평균 $36.5^{\circ}C$, 표면온도 $28^{\circ}C$가 되도록 설계하였다. $4.5{\times}10\;mm$의 외부육각을 가지는 Br${\aa}$nemark 형태의 임플란트와 $4.8{\times}10\;mm$의 Microthread 형태를 지니는 내부연결 형태의 임플란트를 과도한 식립토크로 식립하고 온도 측정은 계측점에서 0.2 mm 이내에 열전대를 위치시켜 기록하였다. 삼차원유한요소 분석은 골의 형태를 가로 4 cm, 세로 4 cm, 높이 2 cm의 직육면체로 가정하고, 직육면체 윗면에서 2 mm까지를 피질골, 그 아랫부분을 해면골이라고 가정하였다. 마찰열은 매식이 종료된 상황에서 골에 남는 cavity 모양을 기초로 경계조건을 부여하였다. CAD 프로그램인 SolidWorks 소프트웨어를 이용하였고, 이를 유한요소 구조해석용 프로그램인 Abaqus 6.9-1로 불러들여 해석하였다. 결과 및 결론: In vitro실험에서 Microthread type의 임플란트가 상대적으로 더 높은 최고점 온도를 보여주고 있으며 이는 임플란트의 형태에 따른 마찰열 발생이 주요 원인으로 보인다. 유한요소분석을 통해 살펴본 결과 Br${\aa}$nemark 형태의 임플란트의 경우 50 Ncm이상에서 Microthread를 가지는 형태의 경우에는 35 Ncm이상에서 Eriksson 등이 보고한 역치를 초과하는 온도가 발생하였다. 이를 통해 볼 때 Microthread type 이 식립토크에 따른 온도 증가가 더 민감함을 알 수 있다. 실험결과를 통해서 서로 다른 형태의 임플란트 식립시에 임플란트의 형태에 따라 적절한 삽입토크를 부여하는 것이 성공적인 임플란트 시술에 중요한 요소 중에 하나임을 알 수 있었다. 특히 Microthread를 갖는 임플란트 형태는 높은 초기고정성을 얻을 수 있다는 장점이 있는 반면 과도한 식립 토크로 인한 열 손상 가능성을 가질 수 있으므로 골량과 골질의 신중한 평가와 적절한 수술기법이 필요할 것으로 생각된다. Purpose: This study aims at investigating the influence of various insertion torques on thermal changes of bone. A proper insertion torque is derived based on the thermal analysis with two different implant designs. Materials and methods: For implant materials, bovine scapula bone of 15 - 20 mm thickness was cut into 35 mm by 40 - 50 mm pieces. Of these, the pieces having 2 - 3 mm thickness cortical bone were used as samples. Then, the half of the sample was immersed in a bath of $36.5^{\circ}C$ and the other half was exposed to ambient temperature of $25^{\circ}C$, so that the inner and surface temperatures reached $36.5^{\circ}C$ and $28^{\circ}C$, respectively. Two types of implants ($4.5{\times}10\;mm$ Br${\aa}$nemark type, $4.8{\times}10\;mm$ Microthread type) were inserted into bovine scapula bone and the temperature was measured by a thermocouple at 0.2 mm from the measuring point. Finite element method (FEM) was used to analyze the thermal changes at contacting surface assuming that the sample is a cube of $4\;cm{\times}4\;cm{\times}2\;cm$ and a layer up to 2 mm from the top is cortical bone and below is a cancellous bone. Boundary conditions were set on the basis of the shape of cavity after implants. SolidWorks was used as a CAD program with the help of Abaqus 6.9-1. Results: In the in-vitro experiment, the Microhead type implant gives a higher maximum temperature than that of the Br${\aa}$nemark type, which is attributed to high frictional heat that is associated with the implant shape. In both types, an Eriksson threshold was observed at torques of 50 Ncm (Br${\aa}$nemark) and 35 Ncm (Microthread type), respectively. Based on these findings, the Microthread type implant is more affected by insertion torques. Conclusion: This study demonstrate that a proper choice of insertion torque is important when using a specific type of implant. In particular, for the Microthread type implant, possible bone damage may be expected as a result of frictional heat, which compensates for initial high success rate of fixation. Therefore, the insertion torque should be adjusted for each implant design. Furthermore, the operation skills should be carefully chosen for each implant type and insertion torque.

Changes in orexin-A and neuropeptide Y expression in the hypothalamus of the fasted and high-fat diet fed rats

Yeo Sung Yoon,Eun Sung Park,Seong Joon YI,Jin Sang Kim,이흥식,In Se Lee,Je Kyung Seong,Hee Kyung Jin 대한수의학회 2004 Journal of Veterinary Science Vol.5 No.4

This study was aimed to investigate the changes of orexin-A (OXA) and neuropeptide Y (NPY) expression in the hypothalamus of the fasted and high-fat diet fed rats. For the experiments, the male Sprague-Dawley (SD) rats were used as the model of high-fat diet-induced obesity. The mean loss of body weight (MLBW) did not show the linear pattern during the fasting; from 24 h to 84 h of fastings, the MLBW was not significantly changed. The numbers of OXA-immunoreactive (IR) neurons were decreased at 84 h of fasting compared with those in other five fasting subgroups. The NPY immunoreactivities in the arcuate nucleus (ARC) and the suprachiasmatic nucleus (SCN) observed at 84 h of fasting were higher than that observed at 24 h of fasting. The number of OXA-IR neurons of the LHA (lateral hypothalamic area) in the high-fat (HF) diet fed group was more increased than that of the same area in the normal-fat (NF) diet fed group. The NPY immunoreactivities of the ARC and the SCN were higher in HF group than those observed in the same areas of NF group. Based on these results, it is noteworthy that the decrease of the body weight during the fast was not proportionate to the time-course, implicating a possible adaptation of the body for survival against starvation. The HF diet might activate the OXA and the NPY in the LHA to enhance food intake. This study was aimed to investigate the changes of orexin-A (OXA) and neuropeptide Y (NPY) expression in the hypothalamus of the fasted and high-fat diet fed rats. For the experiments, the male Sprague-Dawley (SD) rats were used as the model of high-fat diet-induced obesity. The mean loss of body weight (MLBW) did not show the linear pattern during the fasting; from 24 h to 84 h of fastings, the MLBW was not significantly changed. The numbers of OXA-immunoreactive (IR) neurons were decreased at 84 h of fasting compared with those in other five fasting subgroups. The NPY immunoreactivities in the arcuate nucleus (ARC) and the suprachiasmatic nucleus (SCN) observed at 84 h of fasting were higher than that observed at 24 h of fasting. The number of OXA-IR neurons of the LHA (lateral hypothalamic area) in the high-fat (HF) diet fed group was more increased than that of the same area in the normal-fat (NF) diet fed group. The NPY immunoreactivities of the ARC and the SCN were higher in HF group than those observed in the same areas of NF group. Based on these results, it is noteworthy that the decrease of the body weight during the fast was not proportionate to the time-course, implicating a possible adaptation of the body for survival against starvation. The HF diet might activate the OXA and the NPY in the LHA to enhance food intake.