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고속 회전하는 RAP(Rocket Assisted Projectile)의 추력 및 유동 특성에 관한 연구
반영우(Youngwoo Ban),정현호(Hyunho Jung),박주현(Juhyeon Park),주형욱(Hyeonguk Joo),이치훈(Chihoon Lee),박용인(Yongin Park),윤종원(Jongwon Yoon) 한국추진공학회 2017 한국추진공학회 학술대회논문집 Vol.2017 No.5
고속 회전하는 로켓보조추진탄의 로켓 추진 유동특성을 수치해석적으로 연구하였다. 회전지상연소시험을 통해 연소실 내부 압력을 계측하였고 지상 조건, 작동 고도 조건, 기저부 압력 조건의 노즐압력비를 적용하여 수치해석을 수행하였다. 그리고 수치해석 결과를 등엔트로피 1차원 해와 지상회전시험 결과와 비교 하였다. 또한 동일 노즐압력비에서 유동의 회전 유/무에 따른 추력특성의 차이를 확인하였다. In this paper, a numerical study has been performed to analyze flow characteristics of rocket propulsion. Through the ground spin test, combustion chamber pressure was measured. Based on the experimental results, numerical analysis was conducted under various nozzle pressure ratio conditions such as standard, operating and base pressure conditions. And it was compared with quasi-1D solution and experimental result. In addition, the difference in thrust characteristics according to the spin/non-spin of the flow conditions was confirmed at the same nozzle pressure ratio.
김영우(Kim Youngwoo),김주혜(Kim Joo-hae),박영미(Park Youngmi) 한국외국어교육학회 2005 Foreign languages education Vol.12 No.1
Recently many universities have established new departments or programs for TESOL typically their career information has been just for future English "teachers." As our society becomes very specialized, career possibilities for TESOL majors are now wide and varied, and the students are allowed to choose diverse career tracks. However, there has been no attempt to provide more specific career information regarding the whole TESOL area for the students. This study investigates professions categorized under the term of English education by TESOL -related institutions or companies. Research into job markets and interviews constitute the main methodology of this study. The TESOL field can be divided into two major areas: "English Teaching" and "Materials Development." Occupations related to English Teaching include institute lecturers (infant, elementary school, middle/high school, and adult level), TESOL researchers, teachers (elementary school and middle/high school), and professors. Secondly, a career in Materials Development can be advanced in the fields of off-line materials (planners and editors, writers, advertisers, marketers), on-line materials (cyber-education planners, Web PD, multimedia material planners and developers), and imported materials (planners, presenters, marketers). The career information in this study will help students to understand the whole field of English education and to identify appropriate jobs to suit their interests and qualifications. In addition, departments or programs gem-ed to TESOL will be able to offer more in the way of concrete educational input, to the benefit of their students and their curricula.
개인가치 성향에 따른 공정여행의 관광지 선택속성이 행동 의도에 미치는 영향
주재식 ( Jaesik Joo ),김영우 ( Youngwoo Kim ),김현숙 ( Hyunsook Kim ) 인문사회 21 2023 인문사회 21 Vol.14 No.1
연구 목적: 이 연구는 공정여행 활성화라는 관점에서 공정여행의 추구에 영향을 미치는 변수 간의 구조적 상관관계를 분석하는 것이다. 연구 방법: 공정여행 상품기획 및 판매를 진행한 여행사를 중심으로 공정여행에 참여한 여행소비자 500명을 대상으로 설문한 조사자료를 실증분석을 위해 SPSS 23.0 통계분석 프로그램을 활용하여 공정여행 활성화 관점에서 공정여행의 추구에 영향을 미치는 변인 간의 구조적 관계를 검증하였다. 연구 내용: 개인가치 성향에 따른 관광지 선택속성의 차이, 행동 의도에 미치는 영향 고찰을 통해 기업차원에서 마케팅 방향과 공정여행 프로그램의 개발 활용 방안을 탐색하였다. 결론 및 제언: 개인가치 성향이 행동 의도에 미치는 영향력의 유의적인 변인이 없었고 관광지 선택속성이 행동 의도에 미치는 영향에서는 시설과 서비스와 자연과 문화 모두 정(+)의 영향력이 있었다. 공정여행을 통해 인식하는 가치가 여행자들과 여행자를 맞이하는 지역민들의 기대치를 충족시킬 수 있는 효과적인 관광정책 수립이 필요하며 국내 여행뿐만 아니라 외국인의 인바운드(inbound) 확대 등 지속가능한 관광산업 활성화를 위한 다양한 정책과 마케팅전략 등을 제언한다. The purpose of this study is to verify the structural correlation between variables that affect the pursuit of fair travel from the perspective of promoting fair travel. To this end, using the SPSS 23.0 statistical analysis program, empirical analysis was conducted on survey data of 500 travel consumers who participated in fair travel, centering on travel agencies that planned and sold fair travel products. Based on the results, the structural relationship between variables that affect the pursuit of fair travel was verified from the viewpoint of fair travel activation. The content of the study is to explore the marketing direction and development and utilization of fair travel programs at the corporate level by examining the difference in tourist destination selection attributes according to individual value propensity and the effect on behavioral intention. As a result of the study, there was no significant variable in the influence of individual value propensity on behavioral intention, and in the influence of tourist destination selection attributes on behavioral intention, facilities, services, and nature and culture all had a positive (+) influence. Based on results of this study, it is necessary to establish an effective tourism policy so that the value recognized through fair travel can meet the expectations of travelers and local residents who welcome them. In addition, it proposes various policies and marketing strategies to promote a sustainable tourism industry, such as expansion of inbound foreigners as well as domestic travel.
<tex> $W$</tex>-Band Multichannel FMCW Radar Sensor With Switching-TX Antennas
Lee, Seokchul,Joo, Joungmyoung,Choi, Junhyeok,Kim, Wansik,Kwon, Hosang,Lee, Sangho,Kwon, Youngwoo,Jeong, Jinho IEEE 2016 IEEE SENSORS JOURNAL Vol.16 No.14
<P>In this paper, a multichannel frequency-modulated continuous wave (FMCW) radar sensor with switching-transmit (TX) antennas is developed at W-band. To achieve a high angular resolution, a uniform linear array consisting of 5 switching-TX and 12 receive (RX) antennas is employed with the digital beamforming technique. The overall radar front-end module comprises a W-band transceiver and TX/RX antennas. A multichannel transceiver module consists of 5 up-conversion and 12 down-conversion channels, where one of the TX channels is sequentially switched ON. The developed radar sensor generates multiple digital beams with high gain, low side lobe level, and narrow beamwidth. The design of each component in the radar module is described with the measurement results. The assembled FMCW radar sensor exhibits a measured angular resolution of less than 2 degrees, and a field of view of approximately 60 degrees.</P>
Sungsu Cha,Yujong Kim,Jinsik Ju,Youngwoo Joo,Byeong-No Lee,Soo Min Lee,Jae Hyun Kim,Pikad Buaphad,Byung Cheol Lee,Hyungki Cha,Jang Ho Ha,Hyung Dal Park,Ki Beak Song,Seung Hyun Lee,Heesoo Kim 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.6
The Korea Atomic Energy Research Institute (KAERI) has been developing a Container Inspection System (CIS) by using a dual-energy (9/6 MeV) S-band (= 2856 MHz) electron linear accelerator. The key components of the CIS are the electron linear accelerator (including an electron gun, an accelerating structure, an RF power source, cooling chillers, vacuum pumps, magnet power supplies, and two solenoid magnets with beam focusing and shielding functions), a tungsten target for X-ray generation, an X-ray collimator, a detector array, and a container moving system. Generally, in accelerators, beam focusing is mainly done by solenoids operating in the region of a few MeV to keep the shape of transverse beam symmetrically round so as to reduce the loss of electrons, which increases the beam current and the beam power. In addition, a specially-designed component is needed to protect against the radiation due to the lost electrons. In this paper, we describe the design, fabrication, and optimization of two specially- designed solenoids with focusing and radiation shielding functions for a dual-energy S-band electron linear accelerator for a CIS.
이선복(Seonbok Yi),좌용주(Yong-Joo Jwa),진미은(Mi-Eun Jin),길영우(Youngwoo Kil) 한국암석학회 2019 암석학회지 Vol.28 No.4
우리나라 선사시대 유적지 중 하나인 연천 삼거리에서 출토된 흑요석제 석기에 대한 산지를 유추해 보았다. 삼거리 흑요석제 석기에 포함된 미세결정 중 산화광물과 휘석은 연정 내지 포이킬리틱 조직을 보이며, 휘석의 미세결정은 그 조성이 헤덴버자이트 내지 오자이트의 조성을 가진다. 기질에 대한 주성분 산화물의 함량에서 삼거리 흑요석제 석기는 좁은 범위의 일정한 값을 나타내며 SiO₂ 함량이 73.8~75.5 wt.%의 산성의 유문암 조성을 나타낸다. 기질의 희토류원소 함량 역시 일정하며 뚜렷한 Eu 음의 이상을 보인다. 삼거리 흑요석제 석기의 이러한 광물학적 및 지구화학적 특징을 우리나라 주변 흑요석 대표 산지인 백두산과 일본규슈의 흑요석과 비교해 보았을 때, 흑요석제 석기의 원석이 백두산에서 유래되었을 가능성이 크다. We estimated the provenance of the obsidian artifacts from Samgeori site at Yeoncheon, one of the prehistoric sites in South Korea. Pyroxene microlites are of hedenbergite to augite compositions, and intergrown and/or overgrown with Fe-oxides showing poikilitic texture. Major oxides contents for the matrix of the obsidian artifacts exhibit a narrow compositional range, especially SiO₂ contents being 73.0~75.5 wt.% of acidic rhyolitic composition. Also, rare earth element (REE) contents are relatively constant in the obsidian artifacts, and the chondrite-normalized REE patterns show a strong Eu negative anomaly. These mineralogical and geochemical features of the Samgeori obsidian artifacts were compared with those from both the Baekdusan obsidians and Japanese Kyushu obsidians which have been thought to be two major obsidian provenances around South Korea. It is suggested that the Samgeori obsidian artifacts were possibly originated from the Baekdusan obsidians.