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관성항법장치를 이용한 K2전차 전차포 자세측정 방법 및 명중률에 미치는 영향에 대한 연구
김성호,김건국,권혁민,유석진,박병훈,이병길,김의환,Kim, Sungho,Kim, GunKook,Kwon, Hyukmin,Yu, Sukjin,Park, Byunghoon,Lee, Byunggil,Kim, Euiwhan 한국군사과학기술학회 2016 한국군사과학기술학회지 Vol.19 No.2
In the original design of K2 tank the Vertical Sensor Unit(VSU) was mounted to measure the attitude of the main gun to enhance the hit probability. In this research, as a part of efforts to reduce the cost of K2, it was theoretically simulated and evaluated to use the data from Inertial Navigation System(INS) for the calculation of the gun attitude instead of the direct measurement using VSU. It was found that the negative effect of INS approach is negligible and the elimination of VSU is technically possible and beneficial to the system.
G-induced Loss of Consciousness(G-LOC) 예측을 위한 신체 부위별 Electromyogram(EMG) 신호 분석
김성호,김동수,조태환,이용균,최부용,Kim, Sungho,Kim, Dongsoo,Cho, Taehwan,Lee, Yongkyun,Choi, Booyong 한국군사과학기술학회 2017 한국군사과학기술학회지 Vol.20 No.1
G-induced Loss of Consciousness(G-LOC) can be predicted by measuring Electromyogram(EMG) signals. Existing studies have mainly focused on specific body parts and lacked of consideration with quantitative EMG indices. The purpose of this study is to analyze the indices of EMG signals by human body parts for monitoring G-LOC condition. The data of seven EMG features such as Root Mean Square(RMS), Integrated Absolute Value(IAV), and Mean Absolute Value(MAV) for reflecting muscle contraction and Slope Sign Changes(SSC), Waveform Length (WL), Zero Crossing(ZC), and Median Frequency(MF) for representing muscle contraction and fatigue was retrieved from high G-training on a human centrifuge simulator. A total of 19 trainees out of 47 trainees of the Korean Air Force fell into G-LOC condition during the training in attaching EMG sensor to three body parts(neck, abdomen, calf). IAV, MAV, WL, and ZC under condition after G-LOC were decreased by 17 %, 17 %, 18 %, and 4 % comparing to those under condition before G-LOC respectively. Also, RMS, IAV, MAV, and WL in neck part under condition after G-LOC were higher than those under condition before G-LOC; while, those in abdomen and calf part lower. This study suggest that measurement of IAV and WL by attaching EMG sensor to calf part may be optimal for predicting G-LOC.
가비지 컬렉션과 마모도 평준화 대상 블록의 구분을 위한 블록 소거 횟수 기반 모니터링 기법
김성호,황상호,이명섭,곽종욱,박창현,Kim, Sungho,Hwang, Sang-Ho,Lee, Myungsub,Kwak, Jong Wook,Park, Chang-Hyeon 대한임베디드공학회 2017 대한임베디드공학회논문지 Vol.12 No.3
In this paper, we propose BCMR (Block Classification with Monitor and Restriction) to ensure the isolation and to reduce the interference of blocks between a garbage collection and a wear leveling. The proposed BCMR monitors an endurance variation of blocks during the garbage collection and detects hot blocks by making a restriction condition based on this information. The proposal induces a block classification by its update frequency for the garbage collection and the wear leveling, so we will get a prolonged lifetime of NAND flash memory systems. In a performance evaluation, BCMR prolonged the lifetime of NAND flash memory systems by 3.95%, on average and reduced a standard deviation per block by 7.4%, on average.
Effects of Body Movements in Using Virtual Reality Headsets
Sungho Kim(김성호),Yeonoh Hong(홍연오),Ki Joon Kim(김기준),Dong-Hee Shin(신동희) 한국HCI학회 2016 한국HCI학회 학술대회 Vol.2016 No.1
Although reasonably priced portable virtual reality (VR) devices are being rapidly introduced, there still exists a critical problem related to the visually induced motion sickness, which is largely caused by both actual and perceptual movements induced in users’ vestibular systems. Thus, this study examines whether engaging in body movements (hand gesture vs. no hand gesture) makes changes to users’ VR experience and perceptions. Results indicated that body movements induced during VR interactions lead to greater arousal, and the effect of body movement (on users’ feelings of presence) was moderated by eyewear usage.
김성호(Kim Sungho) 한국문화융합학회 2021 문화와 융합 Vol.43 No.9
이 연구는 동시대 미술의 다원주의 미술의 경향에서 두드러지게 드러난 일상 통합의 문제를 분석한다. 이를 위해서 예술이 미학의 대상으로 대두된 시기로부터 20세기 미술을 거쳐 오늘날에 이르기까지 예술이 여러 장르로 범주화된 경향을 고찰한다. 시간 예술에 대한 공간 예술, 청각 예술에 대한 시각 예술과 같은 범주화는 동시대에서는 더 이상 유효하지 않다. 20세기 중반 이후 예술 통합이 가속화되었기 때문이다. 20세기 미술은 새로운 미디어를 다루는 예술가들에 의해서 다양한 장르 간 통합이 전개되었을 뿐만 아니라 새로움을 찾는 현대 미술이 일상의통합마저 도모한다. 본고는 이미 일상을 깊숙이 끌어안은 현대 미술의 다원화 경향을 이해하기 위해서 단토의 예술종말론이 야기한긍정적 다원주의 미술에 대한 고찰과 더불어 보드리야르의 미술무가치론이 야기한 부정적 견해를 함께 고찰했다. 이제 예술의 일상 통합에 관한 연구는 부정적 비판을 고려한 채 긍정적인 논의의 방향성이 무엇인지 살펴볼 과제를 남겼다. 본고는 니콜라 부리오의 포스트 프로덕션의 개념을 통해서 ‘부정과 긍정’의 선택의 문제가 아니라 예술을 위한 사용과 사용 주체의 인식이 더욱 주요함을 주장했다. 본고는 예술이 수용되는 오늘날 예술 현장에서의사회적 맥락과 소통 행위를 주목하면서 또 다른 연구의 방향성으로 전개될 필요성이 있다. 본고는 이러한 연구를전개하기 위한 하나의 방향타가 될 것이다. This study analyzes the problem of integration with the everyday life of art, which is prominently revealed in the trend of pluralistic art in contemporary art. Categorizations such as spatial art vs temporal art and visual art vs auditory art are no longer valid in contemporary times. This is because art integration has accelerated since the mid-20th century. In the 20th century art, not only the integration between various genres was developed by artists who deal with new media, but also modern art seeking novelty promotes the integration of everyday life. In order to understand the pluralistic trend of modern art that has already embraced our daily lives, this paper examines the positive pluralistic art caused by Arthur Danto s eschatology and also the negative views caused by Jean Baudrillard s art worthlessness. Now, research on the daily integration of art leaves the task of examining the direction of positive discussion while considering negative criticism. Through Nicola Burio’s post-production concept, this paper asserts that it is not a matter of the choice of “negative and positive” but that it is important to use it for art and the perception of the subject of use. This paper needs to be developed in another direction of research, paying attention to the social context and communication behavior in the art scene today, where art is accepted. This paper will serve as a rudder for developing such a study.
Leans 착각을 위한 지원 장치로 전정기관자극의 활용
김성호(Sungho Kim),엘라(May Jorella Lazaro),강요한(Yohan Kang),윤명환(Myung Hwan Yun) 대한인간공학회 2021 대한인간공학회 학술대회논문집 Vol.2021 No.11
Objective: 본 연구의 목적은 Galvanic Vestibular Stimulation (GVS) 기술을 활용하여 leans 착각에 대한 대응 효과를 확인하는 것이다. Background: Leans는 조종사들이 자주 경험하는 Spatial Disorientation (SD)의 유형으로 비행 임무 수행에 악영향을 미칠 수 있다. 조종사들의 비행 안전을 보장하기 위해서는 leans에 효과적으로 대응하는 방법에 대한 연구가 중요하다. Method: 본 연구는 공군 조종사 20명을 대상으로 GVS 장비를 착용한 상태에서 SD 시뮬레이터를 탑승하여 실험을 수행하였다. 실험 데이터는 3가지 GVS 조건(without GVS, step-GVS, ramped-GVS)에 따른 roll angle error와 주관적인 SD 척도를 활용하여 분석되었다. 또한, step-GVS와 ramped-GVS 조건에 대해서는 인지된 강도와 불편도 점수를 추가적으로 분석하였다. Results: 실험 결과, roll angle error와 주관적인 SD 척도 점수는 모두 step-GVS와 ramped-GVS 조건이 without GVS에 비해 낮은 것으로 나타났다. 한편, ramped-GVS의 불편도 점수는 step-GVS보다 유의하게 낮았다. Conclusion: 본 연구의 결과는 GVS가 leans에 대응하는 효과적인 방법으로 활용될 수 있음을 입증하는 객관적인 근거로 활용될 수 있다. Application: GVS 기술은 조종사의 leans 대응 훈련 또는 시스템 개발에 적용될 수 있다.
김성호(Sungho Kim) 한국비평이론학회 2009 비평과이론 Vol.14 No.2
Liberal or postmodern at its core, contemporary cosmopolitanism is an attempt to negotiate both globalization and multicultural particularism. this paper critically discusses three positions in today's cosmopolitanism: the liberal-universalist project of "cosmopolitan democracy"; the post-identitarian case for "actually existing cosmopolitanism"; and the "communitarian cosmopolitanism" offering apologia for the nation-state and internationalism. Archibugi's "cosmopolitan democracy" is an ideal response to the many problems and crises on our globe which seem to call for positive world governance. Yet doubts arise as to whether the transnational power of "a world parliament" will not be turned into a new global oligarchy. Arguments for "actually existing cosmopolitanism" invite no less criticism. Above all, the notion of the multiple belonging of "minoritarian cosmopolitans" comes curiously close to the viewpoint of frequent flyers, a new privileged class in the age of global capitalism. Finally, "communitarian cosmopolitanism" takes a stand against postnational discourses, stressing on local solidarity and democratization. The stress, though needful enough, should on local solidarity and democratization. The stress, though needful enough, should not lead us into an alliance with ethnocentric nationalism; local concerns should instead be substantially articulated with cosmopolitan interests.
김성호(SUNGHO KIM),김채환(CHAEHWAN KIM),오화진(HWAJIN OH),윤재륜(JAE RYOUN YOUN) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Injection molding is one of the most common operations in polymer processing. Good quality products are usually obtained and major post-processing is not required. However, residual stresses which exist in plastic parts after ejection affect the final shape and mechanical properties. Residual stresses are caused by polymer melt flow, pressure distribution, non-uniform temperature field, and density distribution. Residual stresses are predicted in this study by numerical methods using Hypermesh™, Moldflow™ and ABAQUS™. Residual stresses are measured by two methods, the Layer removal and Hole drilling method, but in this paper, we use hole drilling method because automotive part has complex shapes. We have presented that Hole drilling method is applicable to measure residual stresses. Residual stress distribution predicted by the thermal stress analysis is compared with the measuremental results obtained by Hole drilling method. And then we can verify them though 3D Scanning datum.