천식 소아에서 혈청 렙틴과 만니톨 기관지 과민성과의 관계

유정경 ( Jung Kyung Yoo ),신재영 ( Jae Young Shin ),유정섭 ( Jueng Sup You ),정수인 ( Soo In Jeong ),송준섭 ( Joon Sup Song ),양승 ( Seong Yang ),황일태 ( Il Tae Hwang ),이하백 ( Ha Baik Lee ),백혜성 ( Hey Sung Ba다 ) 대한천식알레르기학회 2014 Allergy Asthma & Respiratory Disease Vol.2 No.1

Purpose: Epidemiological data indicate that obesity is a risk factor in asthma, however effects related to obesity and adipokines on airway inflammation and bronchial hyper-responsiveness (BHR) have not yet been demonstrated in the human airway. The aim of this study was to investigate the relationship between serum adipokine levels and BHR to mannitol in asthmatic children. Methods: Serum adipokine levels were measured and pulmonary function tests were perfomed: baseline, postbronchodilator inhalation, methacholine inhalation, and mannitol inhalation. The response to mannitol was expressed as the dose causing a 15% decrease in forced expiratory volume in one second (FEV1) (PD15), and as the response-dose ratio (RDR) (% fall in FEV1/cumulative dose). Results: Sixty-nine prepubertal children between the ages of 6 and 10 years were participated in the study. They comprised asthmatic children (n=40) and healthy (n=29). Twenty-two subjects (55.5%) with asthma had a positive mannitol bronchial provocation test (BPT) result. The body mass index (BMI) was higher in those asthmatics with positive mannitol BPTs than in asthmatics with negative mannitol BPTs and in the control group (19.30 kg/m2 vs. 17.60 kg/m2 vs. 17.93 kg/m2, P=0.035, P=0.046). Serum leptin levels were also significantly higher in asthmatics with positive mannitol BPTs than in asthmatics with negative mannitol BPTs and in the control group (10.58 ng/mL vs. 5.49 ng/mL vs. 6.75 ng/mL, P=0.002, P=0.016). Leptin values were significantly associated with a PD15 (r=.0.498, P=0.022) and RDR to mannitol (r=0.346, P=0.033) in asthmatic children after adjustment for BMI. Conclusion: Serum leptin levels were significantly associated with BHR to mannitol in asthmatic children. (Allergy Asthma Respir Dis 2014;2:30-37)

한국인 대학생의 영어학습 경험과 제2언어 자아 연구

유정원(Yoo Jung Won),신동일(Shin Dong Il) 팬코리아영어교육학회(구 영남영어교육학회) 2016 영어교육연구 Vol.28 No.3

This study explores how four Korean university students’ L2 (second language) selves differ from and expand on their experiences of English language learning and use. It also investigates their own definitions of successful language learners. Research data were collected from semi-structured interviews, weekly journals and a self-assessment questionnaire. This study found three perceptions of four Korean university students’L2 selves as (un)successful: (1) After successfully experiencing TOEIC-taking success and necessary communicative skills, an ought-to L2 self as unsuccessful was possibly transformed into an ideal L2 self as successful; (2) Whenhigh TOEIC scores were not successfully acquired, an ought-to L2 self was negatively reinforced; and (3) the participants who have formed an ideal L2 self to communicate in authentic English struggled to accept a newly constructed test-taker identity. It was found that their L2 selves have changed over time and space. The hegemonic mediation occurred between ideal and ought-to L2 self when co-existing selves were in conflict, or in needs of negotiation.

대변위 측정을 위한 다중화된 광섬유 센서

유정애 ( Jung Ae Yoo ),권일범 ( Il Bum Kwon ),조재흥 ( Jae Heung Jo ),서대철 ( Dae Cheol Seo ) 한국센서학회 2005 센서학회지 Vol.14 No.3

A multiplexed bend loss type single-mode fiber-optic sensor system was prepared to measure the displacement of several cm of the civil engineering structures such as many bridges, tunnels and various buildings. This bend loss type fiber-optic sensor used the signal difference between two reflection signals due to various bend losses generating at a pair of optical connectors by using OTDR (optical time domain reflectometer) for measuring displacements. And the experiments were conducted for showing the measurement feasibility on the range of 10 cm, and the multiplexing experiments were also performed to measure the displacements of 5 measuring positions of an object by setting these 5 fiber-optic sensors on a single mode fiber simultaneously.

광커넥터의 반사를 이용한 다중화된 굽힘 손실형 단일모드 광섬유 변위센서

유정애,조재흥,권일범,Yoo Jung-Ae,Jo Jae Heung,Kwon Il-Bum 한국광학회 2004 한국광학회지 Vol.15 No.5

교량과 각종 건물을 비롯한 대형 토목 구조물에서 발생하는 수 mm의 변위를 한 개의 광섬유로 간편하게 측정하기 위하여 광커넥터에서 반사가 굽힘 손실에 의하여 변하는 현상을 이용한 새로운 다중화된 광섬유 변위센서를 제안하고 실험하였다. 한 쌍의 광커넥터 양끝에서 반사광의 신호차이가 두 광커넥터 사이에서 발생한 굽힘 변위에 의해서 달라지는 것을 Optical Time Domain Reflectometer로 측정하여 선형으로 그 변화가 측정되는 변위센서를 만들고, 이 센서 4개를 직렬형으로 배열하여 여러 지점의 변위를 동사에 측정이 가능한 다중화 센서 시스템을 구성하고 실험하였다. 그 결과 이 변위센서를 이용하면 4개 지점에서 각각 최대 6 mm까지의 변위를 6%의 오차범위 내에서 0.9942의 선형성을 가지고 변위를 측정할 수 있음을 확인하였다. We propose and present a new multiplexed bend loss type single-mode fiber-optic sensor system for displacement measurement in order to measure the displacement of several mm of civil engineering structures such as bridges and buildings. We make a bend loss type fiber-optic sensor for measuring displacements using the signal difference between two reflection signals due to various bend losses generating at a pair of optical connectors by using the optical time domain reflectometer. And we fabricate a multiplexed bend loss type fiber-optic sensor detecting linear displacements of 4 measuring positions of an object by setting these new 4 fiber-optic sensors on a single mode fiber simultaneously. We find that the multiplexed fiber-optics displacement sensor has linearity of 0.9942, maximum displacement of 6 mm, and accuracy of 6% for 4 measuring points.

231 - 292 MHz 대역 주파수도약용 Tracking Filter의 설계

유정혁(Jung Heuk Yoo),방성일(Sung Il Bang) 대한전자공학회 2001 대한전자공학회 학술대회 Vol.2001 No.6

대화형 IPTV 서비스를 위한 사용자 중심의 패키지 콘텐츠 운용 시스템

김광용,이영일,유정주,류원,정재길,정회경,Kim, Kwang-Yong,Lee, Young-Il,Yoo, Jeong-Ju,Lyu, Won,Jeong, Jae-Gil,Jung, Hoe-Kyung 한국정보통신학회 2009 한국정보통신학회논문지 Vol.13 No.11

최근 IPTV(Internet Protocol Television) 서비스는 방송 영상과 함께 다양한 데이터를 제공받을 수 있는 대화형(Interactive) 서비스 특성을 제대로 살리지 못한 단순 방송 서비스 수준에 머무르고 있다. 이에 IPTV 사업자는 소비자(시청자)의 참여를 유도하고 방송 콘텐츠의 독점적 서비스 방식을 탈피하기 위해 노력하고 있다. 하지만 기존의 서비스 시스템이 각 사업자 간의 통합된 솔루션을 사용하지 않기 때문에 상호운용성 문제가 발생한다. 이를 해결하기 위해서는 생성된 패키지 콘텐츠를 공유하고 배포하기 위한 프레임워크 및 시스템이 필요하다. 본 논문에서는 대화형 IPTV 서비스를 위한 사용자 중심의 콘텐츠 공유 및 배포 프레임워크를 제안하였다. 또한 프레임워크를 구성하는 핵심 요소인 패키지 콘텐츠 저작 및 소비 시스템을 설계하였다. Recent IPTV services still remain as simple broadcasting services that cannot make the most of interactive features together with various content-associated data. So, IPTV providers are making efforts to break from monopolistic style, so as increasing the user's participation m service. However there is an interoperability problem because no common solution is employed across different providers. To solve this problem, there needs to be a framework for a framework for generating, sharing and distributing package contents. In this paper, we propose user-centered package contents application framework for interactive IPTV services. We also design a package content authoring and consuming system which plays core parts in the proposed framework.

운동의 선호유형에 따른 심리,생리적 반응

문창일 ( Chang Il Mun ),유정인 ( Jung In Yoo ),김동진 ( Dong Jin Kim ) 한국스포츠정책과학원(구 한국스포츠개발원) 2008 체육과학연구 Vol.19 No.1

본 연구의 목적은 운동참가자들이 운동을 통해 경험하게 되는 정서적 경험과 생리적인 반응 사이의 관계를 밝히고자 하는데 있다. 이러한 연구 목적을 달성하기 위하여 선호/비선호 운동유형에 따라 경험하게 되는 심리·생리적 반응을 관찰하고 분석하였다. 실험에 참가한 대상자는 대학생으로서, 25명(남=19, 여=6)이 실험에 참가하였다. 이들은 평소에 일정시간 이상 신체활동을 유지하는 사람들이며, 신체적, 정신적으로 건강한 사람이었다. 수집된 자료에 대한 분석방법은 집단×시간에 따른 차이를 알아보기 위하여 반복측정분산분석(repeated measured ANOVA)을 실시하였으며, 측정 시점간의 차이 비교를 위해 paired-t test를 실시하였다. 이와 같은 연구과정을 거쳐 다음과 같은 결론을 얻을 수 있었다. 첫째, 운동 중 또는 운동 후 체험하는 정서경험에서 선호 운동유형 집단은 비선호 운동유형 집단에 비해 긍정적 정서경험이 높고, 부정적 정서 경험은 더 낮은 것으로 나타났다. 선호 운동유형 집단이 비선호 운동유형 집단보다 긍정적 웰빙(positive well-being; PWB)의 수준은 높게 나타나고 있으며, 심리적 스트레스(psychological distress; PD) 수준은 더 낮은 것으로 나타났다. 둘째, 동일한 운동 강도에서 선호된 운동유형 집단이 비선호 운동유형 집단보다 지각된 피로 수준과 운동 강도 지각이 더 낮았다. 선호 운동유형 집단이 비선호 운동유형 집단보다 신체적 스트레스(fatigue; FAT) 수준이 더 낮은 것으로 나타났으며, 선호 운동유형 집단은 HR(heart rate) 수준이 높음에도 주관적 운동 강도인 RPE (rating of perceived exertion)수준은 더 낮은 것으로 나타났다. 마지막으로 본 연구의 결과에 대한 시사점에 대해 논의 하였다. 또한 운동강도 측정을 위한 객관적인 지표의 사용(예, VO2max의 사용), 성별에 따른 차이 점검, 생태학적 타탕도를 높이기 위한 연구방법과 연구 방향 등을 제안하였다. The purpose of this study was to examine the relationship between affect and physiological response to physical exercise experiencing when participants are taking exercise. Psychological/physiological responses experienced by exercise mode were observed and analyzed. Twenty-five university undergraduates, 19 men and 6 women, served as participants in study. All participants were those who exercise more than certain hours a day and they were healthy both physically and mentally. The data were analyzed through SPSS 12.0 using repeated measured ANOVA to investigate the differences with group and time. At the same time, paired t-test were carried out. The results were as follows. First of all, in emotional experience during exercise or after exercise, high preference group had more experience of positive affect and less experience of negative affect than low preference group. It was appeared that high preference group had higher level of PWB (positive well-being) but had lower level of PD (psychological distress) than low preference group. The second, in the same exercise intensity, high preference group had lower level of perceived fatigue (physical distress or fatigue; FAT) and RPE (perceived exercise intensity) than low preference group. It was appeared that high preference exercise group had not only lower level of FAT but also much lower level of RPE in spite of having higher level of HR than low preference group. In conclusion, implications of these results and some recommendations including use of objective indicator for measuring exercise intensity (e.g.; using VO2max), differences between the sexes, research methods and future directions for making ecological validity higher were discussed.

Modified Brostrom 술식을 이용한 만성 족근관절 외측 불안정증의 치료

박용욱,정용기,유정한,이강일,Park, Yong-Wook,Chung, Yung-Khee,Yoo, Jung-Han,Lee, Kang-Il 대한족부족관절학회 1998 대한족부족관절학회지 Vol.2 No.1

Many surgical procedures have been described for the treatment of chronic lateral instability of the ankle. Tenodesis procedures using peroneus brevis tendon is traditionally common among them. Recently, the modified Brostrom anatomic procedure, that is, tightening the stretched out lateral ligaments to restore their norma] anatomy without the use of supplemental tissues and then suturing the lateral portion of the extensor retinaculum to the distal fibula over the ligament repair. has been gaining in popularity. We have reviewed 6 of 10 consecutive cases at an average of 17 months after modified Brostrom procedure. An excellent or good result was achieved in 5 cases, all of which had improved mechanical stability as measured radiographically. One case that had an unsatisfactory result was in patient who had had a previous Evans' operation. So, we believed that the modified Brostrom procedure is an excellent treating method for chronic lateral instability of the ankle.

직사각형 단면을 갖는 미세채널에서 완전 발달된 다층유동에 관한 해석

김중경,정찬일,장준근,유정열,Kim, Jung-Kyung,Jung, Chan-Il,Jang, Jun-Keun,Yoo, Jung-Yul 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.5

An analytical solution for a vertically stratified viscous flow in a microchannel with a rectangular cross-section is constructed, assuming fully developed laminar flow where the interfaces between the fluid layers are flat. Although the solution is for n-layer flow, restricted results to symmetrical three-layer flow are presented to investigate the effects of the viscosity and thickness ratios of the fluid layers and the aspect ratio of the microchannel on the flow field. Relations between the flow rate and thickness ratios of the fluid layers with varying viscosity distributions are found, considering the cross -sectional velocity profiles which vary noticeably with the three parameters and differ significantly from the velocity profiles of the flow between infinite parallel plates. Interfacial instability induced by the viscosity stratification in the microchannel is discussed referring to previous studies on the instability analysis for plane multilayer flow. Exact solution derived in the present study can be used for examining a diffusion process and three -dimensional stability analysis. More works are needed to formulate the equations including the effects of interfacial' tension between immiscible liquids and surface wettability which are important in microscale transport phenomena.

동절기 단열갱폼 취약부 보완 대책에 관한 연구

최석 ( Suk Choi ),임명관 ( Lim Myung-kwan ),유정일 ( Yoo Jung-il ),남경용 ( Nam Kyung-yong ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.1

Through previous studies, it was reviewed how to improve the insulation performance of weak areas by installing heated wires as a solution to the corners pointed out as weak areas when applying the insulation gang form and the existing pouring areas.