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Kim Han-Sung,Kwon Hyeok-Jung,Kim Kui-Young,Lee Jae-Sang,Kim Yujong 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.80 No.8
The report presents the operation status of and upgrade plan for the 100-MeV proton linac at the Korea Multi-purpose Accelerator Complex (KOMAC). First, an operation history of the 100-MeV linac since its commissioning in 2013, such as operation hours, user services, machine availabilities, and downtimes, is discussed. Second, the status of the beamlines in service or under development is described in a detailed manner. Finally, the Korea Spallation Neutron Source (KSNS), which is part of the upgrade plan for the 100-MeV proton linac to expand its utilization fields, is discussed.
Rigid Axle Type 이 적용된 차량의 Brake Judder 개선에 관한 연구
김유종(Yujong Kim),정현범(Hyunbum Jung) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
Brake-induced vibration of a vehicle such as brake judder has received considerable attention in recent years and<br/> sometimes has been the subject of recall after marketmore and more because it makes comfort and ride performance<br/> poor and gives customers complaints.<br/> In this study, we try to introduce a reduction case of brake judder transferred to the drivers and passengers via<br/> suspension, steering system and vehicle body using a variety of analysis and modification of rear axle. And we<br/> suggest optimal stiffened rear axle without increasing weight.
김유종(Yujong Kim),허훈(Hoon Huh) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Mechanical properties of two kinds of auto-body steel sheets are presented over a wide range of strain rates and temperatures. Tensile tests were conducted at different strain rates and temperatures to determine constitutive models for the two materials. At high temperature, strain rate sensitivity is negative and Portevin?Le Chatelier effect is observed because of dynamic strain ageing (DSA). Widely known constitutive models such as Zerilli-Armstrong and Khan-Huang-Liang models cannot describe DSA effect. Therefore, the models are modified in order to describe material strengthening due to DSA at high temperature. The modified constitutive models give good correlations with experimental data over a wide range of strain rates and temperatures including the range in which material strengthening due to DSA occurs.
점용접부 파단을 고려한 ULSAB-AVC 모델의 충돌해석
김유종(Yujong Kim),하지웅(Jiwoong Ha),허훈(Hoon Huh),임지호(Jiho Lim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Finite element crash analysis can be a great method to design a safe and reliable car in the design process. Today, auto makers try to enhance the accuracy of crash analysis by considering spot-weld failure during the analysis because it has a great effect on the crashworthiness of a car. In this study, the effect of spot-weld failure on the crash analysis of a car is investigated. Spot-weld failure models with different failure criteria are employed to the ULSAB-AVC models and the crashworthiness is evaluated and compared for each models. The intrusion distance and the intrusion velocity of the center pillar are measured for each model after the crash analysis following US-NCAP side impact test The result shows that the crashworthiness of the ULSAB-AVC model is dramatically changed by adopting spot-weld failure models with different spot weld failure criteria.
음향시뮬레이션을 이용한 익산 나바위성당의 음향성능 개선
김채영(Chaeyoung Kim),진유종(Yujong, Jin),김재수(Jaesoo Kim) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
호남의 대표적인 근대건축물인 익산 나바위성당은 1897년 본당을 건립한 이후 지금까지 다양한 종교적 활동이 이루어졌으며 최근에는 성당 일부를 복원하는 공사를 하였으나 시설의 노후화에만 초점이 맞추어져 음향적 결함 및 성능개선은 검토되지 않았다. 따라서 나바위성당은 시설개선 후에도 상당한 음향적 결함이 발생하여 선행연구에서 나바위성당의 음향적 결함 및 문제점에 대한 다양한 자료를 제시했다. 이러한 선행 연구자료를 바탕으로 본 연구에서는 음향시뮬레이션을 이용하여 나바위성당의 최적화된 음향성능 개선안을 제시하고자 하였다. 이러한 자료는 향후 나바위성당의 리모델링시 최적화된 음향성능 확보를 위한 유용한 자료로 활용될 수 있을 것으로 사료된다.
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.
A Contrastive Pragmatic Study of Gratitude Responses Expressions
Yujong Park,Suyun Kim 담화·인지언어학회 2016 담화와 인지 Vol.23 No.4
The goal of this study is to identify and contrast the pragmatic features of Korean EFL learners in the communicative act of responses to gratitude. For the current study, 12 EFL learners and five English native speakers performed role plays in six different task situations in which they carried out the speech act of gratitude responses. Eight Korean native speakers also participated in order to provide baseline intra-cultural data as a possible source of the learners’ deviant realization behaviors from target norms. The data, collected from a role-play task, were analyzed in terms of contrastive pragmatics. In the analysis, overall, recognizing the object of gratitude through acceptance was most frequently used by all three groups. However, specific uses of strategies of the EFL learners (e.g., avoiding responding to gratitude, minimizing the favor) were consistent with those of the Korean native speakers, indicative of an L1 effect. Responses to compliments were frequently entirely missing or removed when compared to those of the English native speakers. Pedagogical implications and limitations are discussed.
Procedural Display and Shadowing in L2 English Lessons
Yujong Park(박유정),Heeju Kim(김희주) 담화·인지언어학회 2018 담화와 인지 Vol.25 No.1
This study investigates how young children (5 and 6 years old) participate in L2 English classrooms through in-depth analyses of video recordings taken from kindergarten English lessons in Korea. Of special interests are: the children’s coordination of verbal and nonverbal actions with talk, and how such action types are produced to accomplish participation in a L2 classroom setting from a younger age. The analyses highlight two interactional phenomena of interest for our understanding of the children’s conduct, namely “shadowing” and ‘procedural display”. “Procedural display” refers to a condition in which the children work to appear successful, while minimal learning may be going on. “Shadowing” refers to the carefully tailored delivery of action, which repeats an immediately preceding move of another participant. It is shown how these different types of resources are intertwined, sequentially organized and collaboratively deployed in children’s construction of locally accountable actions to successfully participate in L2 English lessons.