MIMO 릴레이 네트워크에서 비디오 적응적인 중요도 인지 네트워크 코딩

윤지선(Jisun Yoon),안천수(Chunsoo Ahn),신지태(Jitae Shin) 한국통신학회 2012 韓國通信學會論文誌 Vol.37 No.9

무선 릴레이-OFDM 시스템에서의 네트워크 코딩과 MIMO 기법의 결합 Capacity 성능 분석

윤지선(Jisun Yoon),이상태(Sangtae Lee),신지태(Jitae Shin) 한국통신학회 2011 한국통신학회 학술대회논문집 Vol.2011 No.2

네트워크 코딩과 MIMO 기법을 이용한 무선 릴레이-OFDM 시스템의 BER 성능 분석

윤지선(Jisun Yoon),이상태(Sangtae Lee),김현태(Hyuntai Kim),신지태(Jitae Shin) 한국통신학회 2011 한국통신학회 학술대회논문집 Vol.2011 No.2

Network coding 을 사용한 무선 릴레이 시스템에서 Adaptive Modulation 과 MIMO 결합 기법의 성능분석

윤지선(Jisun Yoon),이상태(Sangtae Lee),박진현(Jinhyun Park),신지태(Jitae Shin) 한국통신학회 2011 한국통신학회 학술대회논문집 Vol.2011 No.6

장소 맥락에 따른 로봇 얼굴 디자인에 대한 사용자 인식 차이 ‑ 공공장소와 사적장소를 중심으로

윤지선(Yoon, Jisun),류한영(Ryoo, Han Young),최지원(Choi, Jiwon),정승은(Chung, Seungeun) 인제대학교 디자인연구소 2021 Journal of Integrated Design Research (JIDR) Vol.20 No.1

연구배경 오늘날 로봇들은 인간의 감성적인 부분까지도 보살필 수 있는 존재로 주목받으며 다양한 서비스 분야에 적용되고 있다. 이러한 서비스 로봇들의 외형을 살펴보면 대부분 인간형 디자인을 적용하고 있으며, 공통적으로 얼굴이 있다는 특징을 지닌다. 로봇에게 있어 얼굴이 중요한 이유는 사용자들이 이들과 상호작용할 때 가장 먼저 마주하게 되는 부분이기 때문이며, 로봇에 대한 첫인상을 결정하는 데 가장 큰 영향을 미치기 때문이다. 또한 인간의 대면 상호작용에 있어 공공장소와 사적장소로 분류되는 장소 맥락은 상호작용의 결과에 주요한 영향을 미치는 요소라 할 수 있는데, 이러한 사실은 인간-로봇의 상호작용의 과정에도 동일하게 적용 가능한 사실로 판단된다. 연구방법 다양한 수준으로 나타나고 있는 인간형 로봇의 얼굴 디자인을 얼마나 인간적으로 느껴지는 지에 따라 분류하였으며, 그 분류를 활용하여 공공장소와 사적장소에서 수준별 로봇의 얼굴들이 호감도와 지각된 유용성에 대해 어떻게 다르게 인식되는지와 특정 수준의 로봇 얼굴 디자인에 대한 인식이 맥락에 따라 차이가 있는지 살펴보았다. 연구결과 수준별 분류 조사 결과 로봇의 얼굴 디자인을 인간적인 정도에 따라 5개의 수준으로 분류할 수 있었으며, 이에 대해 가장 추상적인 디자인부터 가장 인간적인 디자인까지를 수준1에서 수준5로 정의하였다. 장소 맥락에 따라 수준별 로봇의 얼굴에 대한 호감도 인식을 분석한 결과, 공공장소에서는 수준2, 수준4가 호감도가 높은 그룹으로 분류되었고, 사적장소에서는 수준1, 수준2, 수준4가 호감도가 높은 그룹으로 분류되었다. 수준1의 경우 장소 맥락에 따른 호감도의 차이가 통계적으로 유의미하게 나타났다. 장소 맥락에 따라 수준별 로봇의 얼굴에 대한 지각된 유용성 인식을 분석한 결과, 공공장소에서는 수준2, 수준4가 지각된 유용성이 높은 그룹으로 분류되었으며, 수준3과 수준4는 지각된 유용성이 중간인 그룹에도 포함되었다. 사적장소에서는 수준1, 수준2, 수준3, 수준4는 지각된 유용성이 높은 그룹으로 분류되었다. 하지만 로봇의 장소 맥락에 따른 지각된 유용성의 차이는 통계적으로 유의미하지 않았다. 결론 본 연구의 결과를 통해 사용자들은 로봇 얼굴의 인간적인 정도를 판단하는 데에 얼굴형보다 얼굴요소 개수에 영향을 받지만, 공공장소와 사적장소에서의 호감도나 지각된 유용성의 경우 얼굴 요소개수와 상관없이 인상을 좌우하는 얼굴형이나 얼굴 요소 간의 비례 등에 영향을 크게 받는 것을 확인할 수 있었다. 또한 사적장소에서는 공공장소에서와 달리 추상적인 로봇 얼굴 디자인이 거부감을 낮추는 요인으로 작용하여 호감도가 높은 것을 확인할 수 있었고, 지각된 유용성의 경우 장소 맥락에 따른 인식의 차이가 없음을 알 수 있었다. 이는 향후 로봇 얼굴을 디자인할 때 사용자가 로봇을 대면하게 되는 장소와 로봇 얼굴 인상에 대한 고려가 필요함을 시사한다. Background Today’s robot has been recognized as a being to care human emotion, and applied to various service fields. Most service robots have human-like design and a human face in common. Designing a face for a robot is important in human-robot interaction because user faces its face at first, and it has the greatest effect on determining the first impression. Furthermore, the context of a place which can be classified as public and private is a major factor for the outcome of the human’s face-to-face interaction, and this seems to be equally applicable to the process of human-robot interaction. Methods This research categorized human-type robot face designs into various levels of similarity with human face, and explored how robot faces are perceived differently for likeability and perceived usefulness in public place and private place and differences of users’ perception about different levels of robot faces depending on the context of places using levels of robot faces, which were derived from the categorizing research. Result In classification research, designs of robot faces were categorized into 5 different levels. The least human-like face design was defined as level-1, and the most human-like face design was defined as level-5. As a result of analyzing the likeability of the robot face according to the context of the place, level-2 and level-4 were classified as high group in public places, and level-1, level-2, and level-4 were classified as high group in private places, In the case of Level 1, the difference in likeability according to the context of the place was statistically significant. As a result of analyzing the perceived usefulness perception of the robot face according to the context of the place, level-2 and level-4 were classified into groups with high perceived usefulness in public places, and level-3 and level-4 were also included in middle group. In private places, level-1, level-2, level-3, and level-4 were classified as high group. However, the difference in perceived usefulness according to the context of the place of the robot face was not statistically significant. Conclusion Through the results of this study, users are influenced by the number of facial elements rather than the face shape in determining the humanity of the robot"s face. But in the case of likeability and perceived usefulness in public and private places, they are more influenced by the proportionality between facial elements. In addition, we find that in private places, unlike in public places, abstract robot face design serves as a factor in reducing repulsion. This suggests that it is necessary to consider the place where the user faces a robot when designing the robot face in the future.

소아 천식의 진단에서 호기산화질소와 메타콜린 및 adenosine-5`-monophosphate 기관지유발시험의 비교

윤지선 ( Jisun Yoon ),박준성 ( Jun Sung Park ),조현주 ( Hyun Ju Cho ),이은 ( Eun Lee ),양송이 ( Song I Yang ),홍수종 ( Soo Jong Hong ),유진호 ( Jinho Yu ) 대한천식알레르기학회 2016 Allergy Asthma & Respiratory Disease Vol.4 No.2

Purpose: Asthma is a chronic airway inflammatory disease characterized by bronchial hyperresponsiveness and reversible airway obstruction. Bronchial challenge with methacholine or adenosine-5`-monophosphate (AMP) has been used to diagnose asthma. Recently, measurement of exhaled nitric oxide (eNO) can also be used for the diagnosis of asthma. The aim of this study was to compare the diagnostic value for asthma between challenge with methacholine or AMP and eNO in children with chronic nonspecific respiratory symptoms. Methods: One hundred thirty-three children who have chronic nonspecific respiratory symptoms were enrolled. Bronchial challenge with methacholin and AMP were performed, and eNO was measured in all subjects. Subjects were defined as asthma based on the clinical symptoms and bronchodilator response during follow-up of at least 3 months after test. Results: Thirty-three subjects (34%) were finally diagnosed as asthma among 97 patients after 3-month follow-up. The area under the receiver operating characteristic curves for the diagnosis of asthma were 0.903 (95% confidence interval [CI], 0.838-0.969; P<0.001) for methacholline challenge, 0.867 (95% CI, 0.783-0.950; P<0.001) for AMP challenge, and 0.588 (95% CI, 0.467-0.709, P=0.156) for eNO measurement. The cutoff values of these tests were methacholine PC20 (provocative concentration of methacholine causing a 20% fall in forced expiratory volume in one second) 12.0 mg/mL (sensitivity, 87.9%; specificity, 82.8%), AMP PC20 566.2 mg/mL (sensitivity, 84.8%; specificity, 85.9%), and eNO 18.5 ppb (sensitivity, 45.5%; specificity, 71.9%). Conclusion: Measurement of eNO may be inferior to challenge with methacholine and AMP for the diagnosis of asthma in children. (Allergy Asthma Respir Dis 2016;4:100-106)

패킷 손실 환경에서 무기준법을 이용한 H.264/AVC 비디오의 객관적 영상품질 평가지표

김현태(Hyuntai Kim),김요한(Yohan Kim),윤지선(Jisun Yoon),신지태(Jitae Shin) 한국정보과학회 2011 정보과학회논문지 : 정보통신 Vol.38 No.3

보다 나은 영상서비스를 위해 부호화된 영상의 수신시 품질을 평가하는 방법이 중요한 요소중에 하나이다. 본 연구는 객관적 영상 품질 평가방법 중에서 실시간 화질 평가에 적합한 무기준법으로 복잡도가 적으면서도 정확도가 높으며 주관적 화질을 반영하는 H.264/AVC 영상에 적용한 무기준법 화질평가를 제안한다. 제안하는 무기준법 화질평가 방법은 양자화 파라미터와 움직임 벡터 정보, 패킷 손실의 위치, 손실의 패턴, GOP 크기를 이용하여 부호화 과정의 화질열화와 전송과정에서의 패킷 손실에 따른 화질 열화를 고려하여 측정하였으며 사람의 인지적인 품질을 반영하기 위한 주관적 화질평가(DMOS)와의 상관관계를 사용하여 기존방법과 비교하여 성능을 검증하였다. Objective video-quality assessment method is one of essential components to indicate better user-quality. This work proposes a video-quality metric with no-reference method for encoded H.264/AVC that offers less complexity and higher accuracy and that is well-matched with subjective video quality. The proposed quality metric uses the bitstream information such as quantization parameters, motion vectors, locations and patterns of packet loss, and the Group of Picture (GOP) size. The proposed one includes two parts: the encoding distortion and the transmission distortion. The encoding distortion is from lossy encoding and the transmission distortion from the error propagation properties with packet loss. The performance of the proposed metric outperforms the existing schemes in terms of the correlation with subjective Differential Mean-Opinion-Score (DMOS) which reflects the human perception quality.

알레르기비염 동반 여부에 따른 소아 아토피 천식 환자의 호기산화질소 농도와 기관지 과민성

박준성 ( Junsung Park ),이은 ( Eun Lee ),양송이 ( Song I Yang ),윤지선 ( Jisun Yoon ),조현주 ( Hyun Ju Cho ),홍수종 ( Soo Jong Hong ),유진호 ( Jinho Yu ) 대한천식알레르기학회 2015 Allergy Asthma & Respiratory Disease Vol.3 No.6

Purpose: Children with asthma frequently have allergic rhinitis (AR) as a comorbidity. Asthmatic children with AR have a higher exhaled nitric oxide (eNO) level and bronchial hyperresponsiveness (BHR) than those without. The purpose of this study is to investigate the difference in lung function, eNO, and BHR between atopic asthma with and without AR, and the association of eNO and BHR with atopic intensity in total asthmatics. Methods: We recruited 69 atopic asthmatic children with AR, 19 atopic asthmatic children without AR, 38 children with AR, and 43 nonatopic controls. We measured forced expiratory volume in one second (FEV1) and forced expiratory flow at 25% to 75% of forced vital capacity (FEF25%-75%), dose response slope (DRS) of bronchial challenge with methacholine and adenosine 5’-monophosphate (AMP), the levels of eNO, and the ratio of sum of allergen wheal diameter to histamine using skin prick tests. Results: Atopic asthmatic children with AR had a higher eNO level compared to those without AR (P<0.05). However, there was no difference in FEV1 %predicted, FEF25%-75% %predicted, methacholine DRS, and AMP DRS between asthmatic children with and without AR. In total asthmatics, methacholine DRS and AMP DRS significantly correlated with eNO levels (r=0.338, P<0.001; r=0.365, P<0.001), but not with total IgE levels. However, eNO significantly correlated with total IgE levels (r=0.479, P<0.001). Conclusion: These results suggest that AR may enhance airway inflammation but may not lead to enhanced BHR in children with asthma. (Allergy Asthma Respir Dis 2015;3:425-431)

단일기관에서 전산을 통해 수집된 자발적 소아 약물유해반응 보고사례의 분석

박근미 ( Geun-mi Park ),박주현 ( Joo Hyun Park ),정주원 ( Joo Won Jung ),한혜원 ( Hye Won Han ),김재연 ( Jae Youn Kim ),이은 ( Eun Lee ),조현주 ( Hyun-ju Cho ),김영호 ( Yeongho Kim ),윤지선 ( Jisun Yoon ),유진호 ( Jinho Yu ),김태범 대한천식알레르기학회(구 대한알레르기학회) 2016 Allergy Asthma & Respiratory Disease Vol.4 No.5

Purpose: The incidence of adverse drug reactions (ADRs) is increasing. However, studies on the prevalence of ADRs in children are rare. The aim of this study was to investigate the causative drugs and clinical features of ADRs for children in a tertiary university hospital of Korea. Methods: We retrospectively collected ADRs by a computerized self-reporting system in Asan Medical Center. ADRs of children under the age 18 were collected from January 2005 to August 2015, and we analyzed only ADRs containing current symptoms among total ADR data. Results: A total of 1,408 ADR cases were reported, There were 764 male (54.3%) and 644 female patients (45.7%), and the mean age was 11.5±5.8 years (range, 0.18 years). Antibiotics (n=479, 34.0%) were the most common causative drugs, followed by tramadol (n=173, 12.3%), nonsteroidal anti-inflammatory agents (NSAIDs) and acetylsalicylic acid (n=103, 7.3%), narcotics (n=91, 6.5%), antineoplastics (n=87, 6.2%), and sedatives (n=82, 5.8%). The most common clinical features were skin manifestations (n=500, 34.4%). Gastrointestinal symptoms (n=435, 29.9%) were the second most common clinical features, followed by neuropsychiatric symptoms (n=155, 10.7%) and respiratory symptoms (n=123, 8.5%). Among antibiotics, glycopeptides (n=110, 23.0%), third-generation cephalosporins (n=83, 17.3%), and penicillin/ß-lactamase inhibitors (n=60, 12.7%) were the most frequently reported causative drugs. Conclusion: Antibiotics were the most reported common causative drugs of ADRs in children, followed by tramadol, NSAID, and narcortics. Compared with adults, the prevalence of contrast medium-induced ADR was lower in children with a higher prevalence of sedative-associated ADR. Greater attention to possible ADRs in children is needed among medical personnel. (Allergy Asthma Respir Dis 2016:4:354-359)