결정궤환 기반 IEEE802.11p 다이버시티 모뎀 개발

윤상훈,진성근,신대교,임기택,정한균,Yoon, Sang-Hun,Jin, Seong-Keun,Shin, Dae-Kyo,Lim, Ki-Taeg,Jung, Han-Gyun 한국전기전자학회 2015 전기전자학회논문지 Vol.19 No.3

본 논문에서는 IEEE 802.11p WAVE 모뎀을 위한 다이버시티 모뎀 구조를 제안하고 설계하였으며, 이를 실차에 장착하여 성능테스트를 수행하였다. 제안한 구조는 듀얼채널과 다이버시티 기능을 선택적으로 수행할 수 있으며, 선택적 안테나 다이버시티와 Maximum Ratio Combining (MRC) 다이버시티 기능 중하나를 선택하여 수신할 수 있다. 개발된 구조는 HDL로 설계되어 Xillinx Kintex7보드를 이용하여 실도로에서 실차에 장착하여 테스트를 수행하여 성능을 검증하였다. 실험결과 개발된 다이버시티 모뎀은 단일 채널 모뎀에 비하여 안정적인 통신 성공률을 유지할 수 있으며, 전송거리도 안테나 후면 수신시 최소 100%이상 향상됨을 확인하였다. In this paper, we designed a decision feedback based diversity modem hardware architecture for IEEE802.11p WAVE and tested the modem on the road with car attached shark antenna. One of the dual channel modem and the diversity single modem with maximum ratio combining algorithm can be selected on the designed architecture. The designed modem have been implemented on the Xillinx Kintex7 FPGA. We tested the modem performance on the smart highway experience road. As experimental results, we can verify the performance of the diversity modem on real road and the enlarged communication range by more than 100%.

IEEE802.11p를 위한 QAM demapper 최적화

윤상훈(Sang-Hun Yoon),장수현(Soohyun Jang),진성근(Sungkeun Jin),신대교(Dae-kyo Shin),정한균(Han-gyun Jeong),임기택(Ki-Taeg Lim) 한국통신학회 2016 한국통신학회 학술대회논문집 Vol.2016 No.11

다중 경로 패이딩 환경에서의 잔영 주파수 오프셋 검출기

윤상훈(Sang-Hun Yoon),신대교(Dae-kyo Shin),정한균(Han-gyun Jeong),임기택(Ki-Taeg Lim) 한국통신학회 2013 한국통신학회 학술대회논문집 Vol.2013 No.6

시변 채널 추정에 용이한 IEEE 802.11p 용 등화기

윤상훈(Sang-hun Yoon),신대교(Dae-kyo Shin),정한균(Han-gyun Jeong),임기택(Ki-Taeg Lim) 한국통신학회 2014 한국통신학회 학술대회논문집 Vol.2014 No.1

유체역학적 추력편향제어의 성능개선에 관한 수치해석적 연구

윤상훈(Sang-Hun Yoon),전동현(Dong-Hyun Jun),송명준(Myung-Jun Song),조용호(Yong-Ho Cho),이열(Yeol Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.4

부유동을 초음속 주유동 흐름과 같은 방향으로 분사하는 동축류 방식의 추력편향 제어기법에 대한 연구를 수치해석적으로 수행하였다. 다양한 노즐출구 높이, 코안다 플랩 반경, 그리고 계단식 플랩에 대해서 주유동의 코안다 효과에 의한 추력편향 성능을 관찰하였다. 본 연구의 수치해석 결과는 동일한 경계조건에서 얻어진 유동가시화 및 압력측정 결과와 비교되어 좋은 일치로 보였다. 코안다 플랩 반경 변화와 계단식 플랩은 코안다 효과를 향상시키고, 이를 통하여 추력편향 제어의 성능도 개선될 수 있음이 관찰되었다. Thrust vectoring control by injecting jet over a curved wall to control co-f1owing supersonic main jet direction was investigated by numerical simulations. For various nozzle heights and coanda wall radii, and for setting a base step at the nozzle exit, the performance-characteristics of coanda flows were observed. The present numerical results were validated by comparing with Schlieren flow visualizations and wall pressure measurements obtained for the identical boundary conditions, and it showed a good agreement. It was also noticed that changes in coanda wall radius and addition of base step could enhance the coanda effect, and thus the performance of the present co-flowing thrust vectoring control technique.

HEV용 다익 원심팬의 공력학적 설계 연구

윤상훈(Sang-Hun Yoon),박현우(Hyun-Woo Park),조용호(Yong-Ho Cho),이찬(Chan Lee),이열(Yeol Lee) 한국유체기계학회 2011 유체기계 연구개발 발표회 논문집 Vol.2011 No.11

동축류의 코안다 효과를 이용한 초음속 제트의 추력편향제어에 관한 실험적 연구

윤상훈(Sang-Hun Yoon),전동현(Dong-Hyun Jun),허준영(Jun-Young Heo),성홍계(Hong-Gye Sung),이열(Yeol Lee) 한국항공우주학회 2012 韓國航空宇宙學會誌 Vol.40 No.11

이차원 초음속 코안다 유동의 특성에 관한 실험적 연구가 진행되었다. 다양한 슬롯높이대 코안다 벽의 곡률반경 비 및 표면거칠기, 그리고 제트의 전압 변화에 대하여 충격파 구조 및 이력현상과 같은 코안다 유동의 특성이 유동가시화를 통하여 관찰되었다. 그 결과 초음속 코안다 제트의 이력현상은 코안다 표면거칠기의 영향을 받는 것으로 나타났다. 또한 강한 압축성 주제트의 추력편향제어를 위하여 이러한 동축류 코안다 유동이 적용되었고, 이 경우 유체역학적 추력제어의 성능은 코안다 플랩의 곡률반경에 대한 슬롯높이의 비 뿐만 아니라 주제트의 전압에 큰 영향을 받음이 확인되었다. The characteristics of two-dimensional supersonic coanda flow was experimentally investigated. For various ratios of slot height to coanda wall’s radius of curvature, surface roughnesses, and jet stagnation pressures, the characteristics of the supersonic coanda flow such as shock structures and hysteresis were observed by flow visualization. It was found that the characteristics of hysteresis of the coanda jet was related to the surface roughness of the coanda wall. The study was further extended for application of the tangentially injected coanda jet to control co-flowing highly compressible main jet direction. It was noticed that the stagnation pressure of the main jet as well as the ratio of the slot height to coanda wall’s radius of curvature wall was an influencing factor in the performance of the fluidic thrust vectoring method.

Online Review Analysis of Tourist Attractions Using Topic Modeling: Focusing on Hallasan Mountain and Seongsan Ilchulbong Peak

윤상훈(Sang-hun YOON),김근형(Keun-hyung KIM),김한준(Han-Joon KIM) 제주대학교 관광과경영경제연구소 2021 産經論集 Vol.41 No.1

Purpose: The purpose of this paper is to examine how the representative tourist attractions of Jeju, Hallasan and Seongsan Ilchulbong, are perceived by tourists. The analysis was conducted by comparing Hallasan Mountain and Seongsan Ilchulbong Peak to more clearly understand the perception of tourists about the two tourist destinations. In particular, in order to exclude the researcher s point of view as much as possible, the online review data of tourism reviews written freely by tourists was used, rather than data collection in a survey method. Research design, data and methodology: In this paper, online review data was collected, frequently appeared words and topics of interest were extracted using text mining techniques, and two tourist sites were compared. By developing a Python web crawler, online reviews of Hallasan and Seongsan Ilchulbong were collected from a world-class tourist website called Tripadvisor. Text pre-processing was performed to remove unnecessary words from online reviews collected through Python program. For each Korean sentence in online review to which text preprocessing was applied, the tokenization technique using the Python library was applied, and morphemes, which are the smallest words with meaning, were extracted. After extracting only words corresponding to nouns, verbs, and adjective parts of speech from morpheme words, the frequency of appearance was calculated. Online reviews converted into morpheme words were classified as common topics through vectorization and topic modeling. In the online review of Hallasan and Seongsan Ilchulbong, frequent words and common themes were compared qualitatively. Conclusions: The most frequent nouns appearing in Hallasan reviews were courses , and Youngsil and Seongpanak appearing frequently, suggesting that tourists prefer the ‘Yeongsil’ and ‘Seongpanak’ courses to the Gwaneumsa course when climbing Hallasan Mountain. The adjective that often appears in Seongsan Ilchulbong was noisy , and Seongsan Ilchulbong was reminiscent of a noisy atmosphere with many tourists. The main topics in the Hallasan Review were Course Information , Seasonal Climbing , and Hiking . The main topics in the Seongsan Ilchulbong review were tourism activities and experience activities . It could be inferred that Hallasan is a tourist destination for tourists, and Seongsan Ilchulbong Peak is recognized as a tourist destination for both experiential and tourist activities.

Word2Vec를 이용한 토픽모델링의 확장 및 분석사례

윤상훈 ( Yoon Sang Hun ),김근형 ( Kim Keun Hyung ) 한국정보시스템학회 2021 情報시스템硏究 Vol.30 No.1

Purpose The traditional topic modeling technique makes it difficult to distinguish the semantic of topics because the key words assigned to each topic would be also assigned to other topics. This problem could become severe when the number of online reviews are small. In this paper, the extended model of topic modeling technique that can be used for analyzing a small amount of online reviews is proposed. Design/methodology/approach The extended model of being proposed in this paper is a form that combines the traditional topic modeling technique and the Word2Vec technique. The extended model only allocates main words to the extracted topics, but also generates discriminatory words between topics. In particular, Word2vec technique is applied in the process of extracting related words semantically for each discriminatory word. In the extended model, main words and discriminatory words with similar words semantically are used in the process of semantic classification and naming of extracted topics, so that the semantic classification and naming of topics can be more clearly performed. For case study, online reviews related with Udo in Tripadvisor web site were analyzed by applying the traditional topic modeling and the proposed extension model. In the process of semantic classification and naming of the extracted topics, the traditional topic modeling technique and the extended model were compared. Findings Since the extended model is a concept that utilizes additional information in the existing topic modeling information, it can be confirmed that it is more effective than the existing topic modeling in semantic division between topics and the process of assigning topic names.

정신장애인을 위한 미용치료 프로그램 "이미지-Up"

윤상훈(Sang Hun Yoon),이혜은(Hye Eun Lee) 한국정신건강사회복지학회 2012 정신보건과 사회사업 Vol.40 No.1

본 사례연구는 정신보건사회복지사 2급 수련 과정 중 수련 정신보건사회복지사에 의해 진행된 프로그램으로 정신과 입원 환자를 대상으로 전체 7회기 개방집단으로 진행하였다. 각 회기별 내용에는 오리엔테이션을 시작으로 네일아트, 손마사지, 얼굴관리 등 다양한 미용을 활용하여 진행하였다. 진행자는 미용을 할 수 있도록 기본개념과 활용 방법을 설명해주었고 환자 개개인이 스스로 자신의 신체를 가꿀 수 있도록 하였다. 미용치료 프로그램을 통하여 환자는 신체 일부를 가꾸면서 사회적으로 필요 없는 사람이 아닌 사랑하고 가꿔야 하는 인간이라는 사실을 스스로 깨닫게 하여 자존감을 향상시킬 수 있도록 개입하였다. 프로그램을 평가하는 도구는 Rosenberg(196가 개발한 자아존중감척도를 사용하여 사전·사후를 객관적으로 평가 하고, 각 회기 마다 환자의 참여도 및 활동에 따라 수련 정신보건사회복지사가 주관적으로 평가하였다. 선사시대부터 인간을 자신을 꾸미기 위하여 조개껍데기와 동물의 뼈·이빨을 사용하였다. 미용은시간, 공간, 이념을 뛰어넘어 인간의 기본적인 요구 중 하나이지만 이러한 욕구를 반영한 프로그램이 활성화 되어 있지 않다. 향후 다양한 미용매체를 활용하고 연구한다면 높은 효과를 볼 수 있는 프로그램이라고 생각된다. This case study was conducted entire seven sessions in an open group with hospitalized psychiatric patients by a mental health social worker during second level training program. Starting with the orientation session, nail art, hand massage, and facials management sessions were conducted by utilizing a variety of beauty. Social workers explained to the patients the basic concepts and utilizing methods for beauty so that individual patient can grow her/his own body. Through the beauty therapy program by growing a part of body, patients could realize she/he is not someone who is not needed socially but someone who should grow and be loved socially, and social workers intervened to improve self-esteem. We utilized self-esteem scale developed by Rosenberg(196 to evaluate our program, and evaluated pre and post results objectively. For each session, depending on the patient`s participation and activity social worker evaluated subjectively. Since prehistoric times, people have utilized shells and animal bones/teeth to decorate themselves. Beauty is the one of the basic human desires regardless of the time, but we do not have much of the beauty programs for the mentally handicapped. This program is expected to be highly effective with future studies utilizing various cosmetic media.