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쿼드로터 무인항공기 경로유지 유도설계 및 X-Plane을 이용한 시뮬레이션
김현규,송윤정,노정호,송용규 한국항공우주학회 2013 한국항공우주학회 학술발표회 논문집 Vol.2013 No.11
쿼드로터는 회전익 항공기로 수직 이착륙이 가능하고, 비행체가 좌우 대칭이므로 자이로 효과가 적어 제어가 용이하다는 장점으로 인해 항공촬영 등 다양한 분야에 많이 이용되고 있다. 하지만 기체가 불안정 하므로 제어기 없이는 조종이 매우 어렵다는 단점이 있다. 본 논문에서는 Matlab/Simulink를 이용하여 쿼드로터의 자세제어를 위한 자세제어기와 경로 오차 유도 알고리즘을 개발하고 시뮬레이션 프로그램인 X-Plane을 이용하여 자세제어기와 유도 알고리즘의 성능을 검증하였다. Quadrotor, a kind of rotorcraft, not only can take off and land vertically but also can easily be controlled its attitude because of bisymmetry, so it is used for a lot of field like aerial photographing. However, it also has weakness that can hardly be controlled without a controller due to unstability of body. In this paper, we developed attitude controller for handling quadrotor"s attitude and algorithm for inducing aircraft to follow cross track using Matlab/Simulink and verified their performance with simulation program, X-Plane.
게임 과몰입 증상의 결정요인(신체적 측면, 행동적 측면, 정신적 측면)에 관한 연구
김현규,김하균 사단법인 인문사회과학기술융합학회 2018 예술인문사회융합멀티미디어논문지 Vol.8 No.1
There are accelerating paradigm shift from informatization society to intelligent society and internet and smart phone use is common in all age. As a result of this, It occurs very serious problems in Internet games excessive immersions. Game excessive immersion refer to the state of experiencing tolerance, withdrawal symptoms and disability in daily life related to game use. Until industrialization and urbanization, our play culture was with nature. The play culture with nature has been taken over by Internet game. In recent years, with the importance of nature learning, forest activity programs are spreading widely. We expect to bring healing effects of internet game excessive immersion by meeting the desire for play in nature. The empirical results of this study are summarized as follows. First, hypothesis H1 was partially adopted. Hypothesis H1 among the symptom of excessive immersion on game showed that physical aspects and accidental crime aspects did not have a significant effect on healing program. Second, hypothesis H2 was adopted. Healing programs (consultation and treatment, forest experience activity) had a positive significant effect on perceived usefulness. 우리나라는 정보화 사회를 지나 지능화 사회로 패러다임 변화가 가속되고 있으며 전 연령대에서 인터넷 및 스마트 폰 이용이 일상화 되었다. 이로 인한 부작용으로 인터넷 게임 과몰입이 발생하고 있는데 이는 매우 심각한 수준이다. 게임 과몰입은 게임사용과 관련한 내성, 금단증세 그리고 일상생활의 장애를 경험하는 상태를 말한다. 산업화와 도시화가 되기 전까지 우리의 놀이문화는 자연과 함께 하였다. 자연과 함께하는 놀이문화를 인터넷 게임에 빼앗긴 것이다. 최근 자연학습의 중요성과 함께 숲 체험활동 프로그램이 널리 확산되고 있다. 자연 속에서 놀이에 대한 욕구를 충족함으로써 인터넷 게임 과몰입의 치유 효과를 가져 올 것으로 기대한다. 본 연구의 실증분석 결과를 요약하면 다음과 같다. 첫째, 가설 H1은 부분적으로 채택되었다. 가설 H1의 게임 과몰입의 증상 중에서 신체적 측면과 사고범죄의 측면은 숲 체험활동에 유의한 영향을 미치지 않는 것으로 나타났다. 둘째, 가설 H2는 채택되었다. 치유 프로그램(상담ㆍ치료, 숲 체험활동)은 인식된 유용성에 정(+)의 유의한 영향을 미쳤다.
코로나 19 상황에서 고객의 셀프서비스기술에 대한 귀인 경향이 패스트푸드점 재방문의도에 미치는 영향: 그림자노동의 관점을 중심으로
김현규,정남호,부백 한국정보시스템학회 2022 情報시스템硏究 Vol.31 No.3
Purpose The purpose of this study is to examine whether customers’ shadow work and risk perception have an impact on revisit intention to the fast-food restaurant, with mediating role of different types of attribution tendencies. We also added perceived unfairness in the research model, in order to verify its mediating effect on the relationship between attribution tendencies and revisit intention. Design/methodology/approach Applying the shadow work perspective and attribution theory, we designed a research model to confirm the hypotheses. After collecting the data from 331 customers who have used self-service technology in a fast-food restaurant, we conducted an analysis of measurement model and structural model by using Smart-PLS 3.0. Findings This study confirmed that Forced Use of self-service technology can enhance the tendency of dispositional attribution which would negatively affect perceived unfairness and revisit intention. On the other hand, affective risk perception was proven to affect situational attribution, which positively affects revisit intention. Purpose The purpose of this study is to examine whether customers’ shadow work and risk perception have an impact on revisit intention to the fast-food restaurant, with mediating role of different types of attribution tendencies. We also added perceived unfairness in the research model, in order to verify its mediating effect on the relationship between attribution tendencies and revisit intention. Design/methodology/approach Applying the shadow work perspective and attribution theory, we designed a research model to confirm the hypotheses. After collecting the data from 331 customers who have used self-service technology in a fast-food restaurant, we conducted an analysis of measurement model and structural model by using Smart-PLS 3.0. Findings This study confirmed that Forced Use of self-service technology can enhance the tendency of dispositional attribution which would negatively affect perceived unfairness and revisit intention. On the other hand, affective risk perception was proven to affect situational attribution, which positively affects revisit intention.
김현규,김용태,박성우,유형준,유재명,최문기,임성희,김두만,박철희,임해성 대한내분비학회 1998 Endocrinology and metabolism Vol.13 No.2
Cushings syndrome in pregnancy is rare. This is explained by the syndromes association with amencerhea, infertility and abortions. Matemal and fetal risks increase markedly when pregnancy does occur in woman with hypercortisolism. Since pregnant women without Cushings syndrome develop some features of Cushings syndrome, such as hypertension, hyperglycemia and striae, a high index of clinical suspician must be maintained to prevent delay in diagnosis. The physiologic changes in adrenocorticostemid metabolism during pregnancy further complieate the diagnosis. We describe a case of Cushings syndmme in pregnancy secondary to an adrenal cortical adenoma which was diagnosed immediately after a preterm delivery in 24-year-old woman with preeclampsia (J Kor Soc Endocrinol 13:264-270, 1998).
Comparative Study of Leg Mechanisms for Fast and Stable Water-Running
김현규,이상호,임은주,정경민,서태원 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.17 No.3
Bio-inspired water-running robots are widely researched for fast and energy-efficient locomotion on water surfaces. The leg mechanism is very important for achieving fast and stable cyclic motion locomotion of the footpads. In this paper, four-bar, Klann, and Watt-I leg mechanisms are compared for water-running robotic platforms. Each mechanism was compared using many groups of random variables to achieve the best performance for fast and stable water running. Many solutions for composing each mechanism were obtained based on random variables that satisfy constraint conditions. Kinematical analysis of the mechanisms was then conducted using the random variables. The four-bar and Klann mechanisms showed better performance for generating propulsion. The lifting forces were similar among the three mechanisms. The results can be a guideline for choosing mechanisms for water-running robots.