항우울제 복용과 폐렴으로 인한 입원 간의 상관관계

최하람,김형래,유시연,손제영,김재송,손은선,금민정,유윤미 한국병원약사회 2022 병원약사회지 Vol.39 No.3

Background : Pneumonia is one of the acute respiratory diseases leading to death in the elderly population, and the death rate from pneumonia is gradually increasing. However, there are not enough studies analyzing the impact of antidepressant use on the occurrence of pneumonia so far. Thus, the purpose of this study was to analyze if the use of antidepressants impacts hospitalization from pneumonia in patients older than 50. Methods : This is a retrospective, case-control study of patients older than 50 admitted to Severance Hospital January 2018-December 2019. Afterwards, patients diagnosed with pneumonia were used as a case group and patients who were not diagnosed with pneumonia were used as a control group. The final target patient was selected by propensity score matching. Based on the index date of each patient, the recency, components, dose, and duration of antidepressant prescription for the previous a year were investigated. Results : The use of antidepressants significantly increased the risk of hospitalization for pneumonia (model 3: adjusted OR [aOR] 1.69, 95% CI 1.31-2.17). As a result of analysis by class of antidepressants, except for model 1, taking atypical antidepressant significantly increased the risk of hospitalization from pneumonia (model 2: aOR 1.55, 95% CI 1.01-2.39; model 3: aOR 1.56, 95% CI 1.31-2.17). Also, in all models, the group taking TCA significantly increased the risk of hospitalization for pneumonia (model 3: aOR 1.68, 95% CI 1.02-2.79). Conclusion : The use of antidepressants significantly increased the risk of hospitalization for pneumonia. The longer and more recent antidepressant use, the higher the risk of hospitalization for pneumonia. However, considering the limitations of this study, a long-term and prospective study is needed.

360 VR에서 GUI 종류에 따른 시선 이동 경향성에 대한 연구

최하람,남상훈 차세대컨버전스정보서비스학회 2022 차세대컨버전스정보서비스기술논문지 Vol.11 No.4

The 360 ​​VR video has no frame boundaries and the user’s eye movement is characterized by increased freedom. Due to these characteristics, users may miss an essential part of the 360 ​​VR video narrative, and their gaze may not move according to the direction of the narrative intended by the director. Therefore, a directing technique that considers the movement of the user’s gaze in the 360 ​​VR video is required. In order to analyze the directing technique considering the movement of the user’s gaze in the 360 ​​VR video, it is necessary to analyze the user’s visual information, and in this case, eye-tracking technology is used. In this paper, the user’s gaze movement tendency according to the type of GUI in the 360 VR video was analyzed using the 360 ​​VR eye tracking system. Based on the gaze tracking system, an experiment was conducted to analyze the user’s gaze movement tendency according to the size, frequency, time, and number of GUI. The results were derived that the larger the GUI size, frequency, time, and number values, the more active gaze movements were induced, and the longer the GUI exposure time, the more subjects’ gaze movements were induced. 360 VR 영상은 프레임의 경계가 없으며 사용자 시선 이동의 자유가 높아졌다는 특징이 있다. 이러한 특징 때문에 사용자는 360 VR 영상 내러티브의 필수적인 부분을 놓칠 수도 있으며 연출자가 의도한 서사의 흐름대로 시선이 이동하지 않을 수도 있다. 따라서 360 VR 영상에서 사용자의 시선 이동을 고려한 연출 기법이 필요하다. 360 VR 영상에서 사용자의 시선 이동을 고려한 연출 기법을 분석하기 위해서는 사용자의 시각 정보를 분석하는 과정이 필요하며 이때 시선 추적 기술이 활용된다. 본 논문에서는 360 VR 시선 추적 시스템을 활용하여 360 VR 영상에서 GUI의 종류에 따른 사용자 시선 이동 경향성을 분석하였다. 시선 추적 시스템을 기반으로 GUI의 크기, 빈도 시간, 개수에 따른 사용자 시선 이동 경향을 분석한 실험을 진행하였다. GUI의 크기, 빈도, 시간, 개수의 값이 클수록 시선 이동이 활발하게 유도되며 GUI의 노출 시간이 길수록 가장 많은 피실험자의 시선 이동을 유도하였다는 결과가 도출되었다.

사용자 참여를 위한 어포던스 요소를 기반으로 혼합현실 지역 문화 실감형 콘텐츠 개발

최하람,남상훈 한국멀티미디어학회 2023 멀티미디어학회논문지 Vol.26 No.7

Realistic content based on immersive technology stimulates the human senses and enables a realistic experience like reality. Realistic content can increase immersion and presence, which can induce users to participate in the content. Accordingly, cultural institutions and museums are developing realistic content to enable users' sensory experience and provide immersion. Using Mixed Reality in art galleries and museums can provide users with additional information about the content. In addition, users can virtually experience artifacts and historical people that cannot be experienced at present. Affordance, which is important in user experience, can provide a high sense of immersion and interaction to users in realistic content. Therefore, it is necessary to consider affordance in developing realistic content. In this paper, regional-culture realistic content using mixed reality was developed. Sculptor Moonshin, who cannot be seen currently, was developed as virtual content. To participate user in the content, the content was developed based on Hartson's affordance, and the developed content was demonstrated and experienced in cooperation with Changwon City Moonshin Art Museum.

360 VR 영상에서 사용자 시선 유도 요소에 대한 연구

최하람,강동현,남상훈 차세대컨버전스정보서비스학회 2020 디지털예술공학멀티미디어논문지 Vol.7 No.4

In the 360 VR video, the size of the screen has been expanded and the degree of freedom for the user's gaze within the video has increased, so the user's gaze may not move as intended by the director in the 360 VR video. Therefore, from the stage of directing, a directing technique considering 360 VR video is required. In this paper, Thirty cases were analysed 360 VR music video uploaded on Youtube from 2015 to 2020. The factors that can cause the user's attention are classified into ‘object movement’,‘CG insertion’, and ‘camera movement’. "Object movement" refers to inducing a user's gaze movement by moving an object(musician) appearing in a video. 'Insert CG' is used when it is necessary to induce the user to move their gaze to a place not watching. 'Camera movement' is used when it is necessary to induce gaze movement in the direction intended by the director by inducing gaze movement in the direction of camera movement. If such a gaze-inducing element is appropriately used in a 360 VR video where the user's field of view is extended, the user’s gaze can be induced as the director intended. 360 VR 영상은 스크린의 크기가 확장 되었고 영상 내에서 사용자 시선의 자유도가 높아졌기 때문에 사용자의 시선이 연출자가 의도한 대로 이동하지 않을 수도 있다. 따라서 연출 단계에서부터 360 VR 영상을 고려한 연출 기법이 필요하며 본 논문에서는 유튜브에 업로드 된 20편의 360 VR 뮤직비디오를 분석하고 사용자의 시선 이동을 유발할 수 있는 요소를 ‘오브젝트의 움직임’, ‘CG 삽입’, ‘카메라의 이동’으로 정리 및 연구하였다. ‘오브젝트의 움직임’은 오브젝트가 이동하면서 사용자의 시선 이동을 유도하는 것이고 ‘CG 삽입’은 사용자가 시청하고 있지 않은 곳으로 시선 이동을 유도해야 할 때 사용되며 ‘카메라의 이동’은 카메라의 이동 방향으로 시선 이동을 유도하여 연출자가 의도한 방향으로 시선 이동을 유도해야할 때 사용된다. 사용자의 시야가 확장된 360 VR 영상에서 이러한 시선 유도 요소를 적절히 사용하면 연출자의 의도대로 사용자의 시선을 유도할 수 있다.

Analysis of Orbital Lifetime Prediction Parameters in Preparation for Post-Mission Disposal

최하연,김해동,성재동 한국우주과학회 2015 Journal of Astronomy and Space Sciences Vol.32 No.4

Atmospheric drag force is an important source of perturbation of Low Earth Orbit (LEO) orbit satellites, and solar activity is a major factor for changes in atmospheric density. In particular, the orbital lifetime of a satellite varies with changes in solar activity, so care must be taken in predicting the remaining orbital lifetime during preparation for post-mission disposal. In this paper, the System Tool Kit (STK®) Long-term Orbit Propagator is used to analyze the changes in orbital lifetime predictions with respect to solar activity. In addition, the STK® Lifetime tool is used to analyze the change in orbital lifetime with respect to solar flux data generation, which is needed for the orbital lifetime calculation, and its control on the drag coefficient control. Analysis showed that the application of the most recent solar flux file within the Lifetime tool gives a predicted trend that is closest to the actual orbit. We also examine the effect of the drag coefficient, by performing a comparative analysis between varying and constant coefficients in terms of solar activity intensities.

대학생의 거부민감성이 대인관계 유능성에 미치는 영향에서 자기자비의 조절효과

최하나(Choi, Ha Na),서미아(Seo, Mia) 숭실대학교 사회과학연구소 2019 사회과학논총 Vol.22 No.1

본 연구는 대학생의 거부민감성이 대인관계 유능성에 미치는 영향에서 자기자비의 조절효과를 파악하기 위하여 수행되었다. 2017년 9월부터 10월까지 서울 경기지역에 재학 중인 대학생을 대상으로 자료를 수집하였으며 총 302부의 자료가 분석에 활용되었다. 자료는 SPSS 23.0을 이용하여 위계적 회귀분석을 사용하여 거부민감성과 대인관계 유능성의 관계에서 자기자비와 자기자비 하위변인들의 조절효과를 검증하였다. 연구결과는 다음과 같다. 첫째, 거부민감성이 대인관계 유능성에 미치는 영향에서 자기자비의 조절효과는 유의하였다. 둘째, 자기자비의 하위 변인인 자기친절, 보편적 인간성, 마음 챙김의 조절효과는 유의하였다. 셋째, 자기자비의 하위 변인인 자기 판단, 고립, 과잉동일시의 조절효과는 유의하지 않았다. 본 연구는 거부민감성이 대인관계 유능성에 미치는 부정적인 영향을 자기자비가 완충요인으로서 조절하고 있음을 확인하였고, 구체적으로는 부정적 하위변인보다는 긍정적 하위변인들의 조절효과가 유의함을 입증하였다. 이에 자기자비 수준을 높이는 상담 개입과 프로그램 개발을 통해서 거부민감성이 높은 대학생들의 대인관계 유능성을 높일 수 있을 것으로 기대된다. The purpose of this study was to examine the moderating effect of self-compassion on the relationship between rejection sensitivity and interpersonal competence. Total 305 data were analyzed by using SPSS program. Hierarchical regression analysis was used to test the moderating effect of self-compassion. The results of the study are as follows: First, rejection sensitivity was negatively correlated with interpersonal competence and self-compassion. Self-compassion was positively correlated with interpersonal competence. Second, self-compassion moderated the relationship between rejection sensitivity and interpersonal competence. Third, self-kindness, common humanity, mindfulness of self-compassion sub factors had a moderate effect between rejection sensitivity and interpersonal competence relationship. However, self-determination, universal humanity isolated, over-identification of self-compassion sub factors did not have moderate effects between rejection sensitivity and interpersonal competence. Based on the results, the need to enhance self-compassion in counseling and program development for interpersonal matters in university students.

삶은 현을 타고 흐른다 - 현악기 마이스터 김동인 씨 가족

최하연 샘터사 2009 월간 샘터 Vol.472 No.-

이중 색상 필터 조리개 카메라를 이용한 객체 검출

최하진(Hajin Choi),박진호(Jinho Park),박하실(Hasil Park),백준기(Joonki Paik) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.6

[오래된 LP가게 ‘리빙사’를 운영하는 정호용 씨 가족] 우리가 만들어내는 하모니

최하연 샘터사 2009 월간 샘터 Vol.478 No.-

메트로니다졸에 의한 가역성 소뇌병증

최하철,신병수,서만욱,김영현,오선영 대한평형의학회 2009 Research in Vestibular Science Vol.8 No.2

Metronidazole is a nitroimidazole antibiotic used for anaerobic infections, protozoan infections, and Helicobacter pylori infections. It may produce rare but well known neurological adverse effects including peripheral neuropathy, encephalopathy, cerebellar dysfunction, and seizures. We describe three patients with metronidazole-induced reversible cerebellar dysfunctions characterized by abnormal oculomotor findings, dysmetria, and ataxia. The diagnosis of metronidazole toxicity was made clinically and supported by the brain MRI findings. The neurological signs and abnormal signal intensity on MRI resolved after discontinuation of metronidazole. Metronidazole is a nitroimidazole antibiotic used for anaerobic infections, protozoan infections, and Helicobacter pylori infections. It may produce rare but well known neurological adverse effects including peripheral neuropathy, encephalopathy, cerebellar dysfunction, and seizures. We describe three patients with metronidazole-induced reversible cerebellar dysfunctions characterized by abnormal oculomotor findings, dysmetria, and ataxia. The diagnosis of metronidazole toxicity was made clinically and supported by the brain MRI findings. The neurological signs and abnormal signal intensity on MRI resolved after discontinuation of metronidazole.