고온 환경하에서의 램제트 엔진 연소실 열구조 해석

이제준(Je-Jun Lee),이영신(Young-Shin Lee),김재훈(Jae-Hoon Kim),변성우(Seong-Woo Byun),김현수(Hyun-Soo Kim),구송회(Song-hoe Koo),문순일(Soon-Il Moon) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11

The combustor, diffuser and nozzle are main components of the ramjet engine. The objective of this study is thermo structure analysis of the combustor. The combustor is composed of 17-4 PH stainless steel housing and Inconel 718 liner. Temperature conditions of housing and liner are quite different. The combustor liner is rapidly heated up to 700℃, so that is reached plastic zone locally. The temperature of combustor housing rises to 400℃. The thermal stress of liner is large than housing stress. The nonlinear thermal analysis with mechanical properties of both housing steel and liner inconel such as Young’s modulus, thermal expansion coefficient and thermal conductivity is conducted. The analysis of the transient temperature and thermal stress of combustor is carried out the finite element method with code Nastran. The structural assessment of combustor is evaluated.

Fe-0.7%C-2.3%Si강의 미세조직과 기계적 성질에 미치는 잔류 오스테나이트 변태 거동

손제영 ( Je Young Son ),권도영 ( Do Young Kwon ),김지훈 ( Ji Hun Kim ),김원배 ( Won Bae Kim ),예병준 ( Byung Joon Ye ) 한국주조공학회 2012 한국주조공학회지 Vol.32 No.3

This steel has been synthesized integrating concepts from Austempering Ductile Cast Iron (ADI) technology. While ADI has excellent mechanical and physical properties, the Young`s modules of ADI is approximately 20% lower than steel. In addition, the presence of graphite nodules in ADI can be sites of crack initiation, where fracture takes place at graphite matrix interface. Because of this limitations of ADI, there has been a growing interest in austempered steels as structural materials in resent years. In this investigation, a new steel with microstructure composed of ferrite and austenite and with simultaneous high tensile strength (1,150MPa) and high ductility (33%) was developed. The goal of this investigation is to obtain a better understanding of deformation and transformation behaviour in high carbon retained austenite(γHC) and over-saturated ferrite(α) during the plastic deformation. A detailed study of the microstructure of this steel was carried out by means of X-ray diffraction (XRD) and electron back scattering diffraction (EBSD) technic. In this way it was shown that BCC phase (BCC) took up the larger part of the nominal strain whereas the a part of retained austenite responded to the mechanincal load by partial martensite transformation, and misorientation change in the retained austenite after plastic strain could be attributed to the large elongation.

김수영 시에 나타난 '자연'과 '몸'에 관한 사유

박지영 민족문학사학회 2002 민족문학사연구 Vol.20 No.-

김수영에게 몸과 자연에 대한 사유는 그의 시적 인식과 긴밀한 관계를 가지고 있다. 김수영은 1950년대 말에 서구적 근대성의 허구성을 깨닫는 순간 자연과 몸에 대한 사유를 통해 새로운 길을 모색하게 된다. 물론 당시에는 이 사유방식에 의구심을 갖고 있었지만 이성적 역사 인식의 최고점인 혁명의 실패는 그로 하여금 자연과 몸에 대한 사유로 돌아오게 한다. 그 결과 몸에 대한 인식은 그에게 진정한 대상 중심적인 ‘사랑’을 깨닫게 하고, 그것이 자연에 대한 사유와 결합되었을때 그의 시적인 인식은 변이를 일으키게 된다. 그 결과 중 하나가 바로 ‘온몸’의 시론이다. ‘온몸에 의한 온몸의 이행’이라는 이 온몸의 시론은 시쓰기를 통해서 존재의 전이를 꾀하는 김수영 특유의 詩作방범에 대한 가장 적절한 표현이다. 그리고 또 하나는 자연의 생성적 능력을 시적인 사유로 전환시킨 것이다. 그는 시 속에서 자연물에 내재하고 있는 혼돈의 전복적 시간을 표현하려 한다. 이러한 모든 인식의 결과가 바로 시「풀」이 된다. I tried to demonstrate in this paper that Kim Soo-young’ thinking about body and nature has a close relation with his poetic recognition. He searched a new way as soon as he noticed the fictitiousness of western modernity in the late 1950s. Failure in revolution which is the summit of reasonal thinking about history made him ponder on body and nature, though skepticism about modernity got appeared in that times. He perceived ‘love’ which placed the object in center through thinking about body, and his poetic recognition became changed by being bond with thinking about nature. The poetics of ‘the entire body’ showed this point, which is expressed as the shift of the entire body by itself. This poetics was a very appropriate expression of his unique versification method which attempts the transition of being by writing poems. It included the transition from the creative capacity of nature to poetic thinking. He tried to express overthrowing time o chaos inherent nature in his poems, I think, which was appeared very cohesively in his poem 「Grass」.

Helicobacter pylori와 대장균의 Shuttle Vector 개발

조명제,이우곤,이상룡,김경희,안영숙,김성희,김현주,류복덕,최여정,윤영혜,백승철,전영석,이광호 경상대학교 유전공학연구소 1997 遺傳工學硏究所報 Vol.16 No.-

In this study, a vehicle vector using cryptic plasmids was constructed for gene transfer in Helicobacter pylori. pHP51(3.9 kb) and pHP489(1.2 kb) were selected for constructing vectors from cryptic plasmid of H. pylori isolates in Korea. The HindⅢ-digestedDNA fragment(1.2kb) of pHP489 and 1.6kb DNA fragment of pHP51 were ligated with a kanamycin resistance gene(aph3'-Ⅲ) from C. jejuni to produce the recombinant plasmids pHP489K and pHP51K, respectively. Transformation frequency of pHP51K by electroporation was low. But pHP489K could be effectively transformed into various H. pylori strains. In order to design an intermdiate vehicle vector for gene transfer into H. pylori, pBlueHP489K was prepared by recloning pHP489K DNA into pBluescript and pTZ19R vector. This vector permitted the DNA fragment containing pHP489 sequence, aph3'-Ⅲ, and cloned DNA to be cut and self-ligated in the SacⅠ site after cloning. ureA and ureB gene were inserted into pBlueHP489K, resulting in pBlueHP489K/AB. The DNA fragment containing pHP489, kanamycin resistance gene(aph3'-Ⅲ), and urease structural gene was cut away from pBlueHP489K/AB and self-ligated to generate pBlueHP489K/AB. pBlueHP489K/AB made urease-negative H. pylori strains restore their urease activity. By this experiment, pBlueHP489K was confirmed to be the vehicle system for transferring H. pylori genes.

공황장애환자에서 광장공포증 동반여부에 따른 스트레스대처방식의 차이

최은영,제영묘,이대수,정영인 대한생물치료정신의학회 2001 생물치료정신의학 Vol.7 No.1

In an attempt to know the factors affecting the development of agoraphobia following panic attacks, the author investigated whether there are differences between coping strategies of panic disorder with and without ago-raphobia. Thirty-seven patients meeting the criteria of DSM-IV panic disorder were divided into 2 subgroups, one group with agoraphobia, another without agoraphobia. Questionaires for the severity of panic symptoms, and of anticipating anxiety for panic attacks, multidimensional coping scale for stress were administered to panic subjects. The results were summarized as follows. 1) Group of panic disorder with agoraphobia complaints trembling or shaking more than group of panic disorder without agoraphobia. 2) There was no differences of degree for the severity of anticipating anxiety between two groups. 3) Group of Panic disorder with agoraphobia had higher score on BDI than Group of panic disorder without agoraphobia. 4) Group of panic disorder with agoraphobia had lower score on active coping, positive interpretation, acceptance than group of panic disorder without agoraphobia, and the differences of these strategies between two groups were not correlated with the score on BDI at the time of investigation. In conclusion, these results suggest that the coping strategies for stress may be a predictor of agoraphobia in patients with panic disorder.

주민참여형 농어촌 테마공원 개발계획 연구 : 청풍지구 농어촌 테마공원을 중심으로

박용순,윤영근,제상호,손경석 경기대학교 부설 관광종합연구소 2014 여가관광연구 Vol.21 No.-

Rural theme park is an on-going business that has been practiced by Ministry for Food, Agriculture,Forestry and Fisheries since 2007. The business aimed to facilitate urban and rural interchange and local economy activation. Rural theme park themed communities by using unique natural and cultural properties owned by the locals. the project adopts bottom-up development that reflects opinions of residents in the tourism planning process. However, it seems to be true that residents have been excluded from tourism planning process even if they were the host of the project for the reasons of lack of knowledge on community-based rural tourism development and lack of experience on bottom-up development. The case of Chung Poong Area in Je Cheon rural theme park used in this study has prioritize residents' involvement in planning procedure. This project emphasized the importance of residents' participation and their role in the entire process of tourism development that ranges from project site decision to the major business decision. Thus, this study suggests a direction that can be used for the future rural theme park projects and community-based project related to planning and design in rural area. 농어촌 테마공원(Rura1 Theme Park) 사업은 2007년부터 농림수산식품부에서 지속적으로 증가하고 있는 농촌관광 수요를 충족하고 농촌지역의 활성화를 위해 진행하고 있는 사업으로 도농교류 및 지역경제 활성화를 목적으로 하고 있다. 농어촌 테마공원은 농촌지역이 가지고 있는 고유한 자연적,문화적 자원 등을 주제로 지역특색에 맞게끔 다양한 형태의 테마공원을 조성하는 것으로 지역주민의 의견을 적극적으로 수렴하는 상향식 사업으로 진행해 나아가고 있다. 그럼에도 불구하고 사업의 실질적인 주체인 지역주민의 경우 주민참여형 농환지역개발사업에 대한 이해부족과 상향식 사업에 대한 경험부족 등으로 계획수립 과정에서 소외되고 있는 것 또한 현실이다. 본 연구는 제천지구 농어촌 테마공원 기본계획을 수립하는 과정에서 지역주민의 참여를 우선적으로 고려하였으며,대상지 선정에서부터 주요사업 도출과정에 이르기까지 계획수립의 전과정에서 걸쳐서 지역주민의 참여와 역할에 대해서 언급하고 있다. 따라서 향후 농어촌테마공원뿐만 아니라 농어촌지역계획 수립과 관련한 주민참여형 사업에 기초자료로 활용될 수 있는 방안을 제시하고자 한다.

Quartz fiber post의 물리적 특성에 관한 연구

이영수,강익제,Lee Young-Soo,Kang Ik-Je 대한치과보철학회 2002 대한치과보철학회지 Vol.40 No.1

The post core system has been used for reconstructon of severely damaged crown by caries or trauma. But problems such as crown exfoliation, post core fracture and root fracture have been reported. Ideal mechanical properies of the post require high fracture strength, high elastic limit and high resistance against fatigue and corrosion Modulus of elasticity of the post should be similar with that of dentine. Low hardness is also required for the convenience of post removal in failure. Furthermore, the post itself must be translucent for the esthetical purpose. Several types of the post have been developed to satisfy the criteria above mentioned. The purpose of this study was to find out the mechanical properties of quartz fiber post by comparing with those of gold post and zirconia post. The results of this study were as follows : 1. Maximal fracture strength and stiffness of quartz fiber post were similar with those of gold post and zirconia post. 2. Young's modulus and hardness of quartz fiber post were lower than those of gold post and zirconia post. Mechanical property of quartz fiber post against post fracture was similar with that of gold post and zirconia post. Mechanical property of quartz fiber post against root fracture was higher than that of gold post and zirconia post. Quartz fiber post could be removed easily due to low hardness.

남자 알코올 의존 환자의 기질적 특성에 관한 연구

김성곤,민영기,이덕기,김미영,송영상,권도훈,고영훈,박제민,정병선 대한생물치료정신의학회 2003 생물치료정신의학 Vol.9 No.1

목 적: 본 연구의 목적은 한국인 남자 알코올 의존 환자의 기질적 특성을 Temperament and Character Inventory(TCI)를 이용하여 조사하는 것이다. 방 법: DSM-Ⅳ 진단 기준에 맞는 알코올 의존 환자 30명과 정상인 36명을 대상으로 연구학적 특성을 조사하고, 기질적 특성을 한글판 TCI를 이용하여 조사하였다. 모든 대상자의 나이는 30~60세였다. 결 과: 1) 두 군간 평균 나이는 유의한 차이가 없었으나, 교육 정도와 결혼을 유지하고 있는 비율 및 취업률은 알코올 의존군이 정상 대조군에 비해 유의하게 낮았다. 2) 알코올 의존군에서는 정상 대조군에 비해 Harm Avoidance(HA) 점수와 Self-transcendence(ST)점수는 유의하게 높았으며, Self-directiveness(SD)점수는 유의하게 낮았다. 3) 알코올 의존군 내에서의 각 척도들 간의 상관관계는, HA와 SD 점수, HA와 Persistence(PE) 점수, ST와 SD 점수는 각각 유의한 음의 상관관계, ST와 PE 점수, SD 점수와 Cooperativeness(CO) 점수, Reward Dependence(RD)와 CO 점수는 양의 상관관계를 보였다. 결 론: 이러한 본 연구의 결과는 한국인 남성에서 수줍음을 잘 타며, 걱정도 많고, 염세적이고 쉽게 피로해지는 기질적 특성이 알코올 의존과 연관성이 있음을 의미한다. Objectives : The purpose of this study was to assess the temperament of male parients with alcohol dependence. Methods : The subjects were 30 patients who met DSM-Ⅳ criteria for alcohol dependence and 36 normal controls. All subjects completed Temperament and Character Inventory(TCI) which was developed by Cloninger. Results : 1) The educational level, marital status, and occupation in alcohol dependence group were significantly lower than those of normal control group, but there was no difference in the age between two groups. 2) Among the scores of TCI, the score of harm avoidance(HA) and self-transcendence(ST) were significantly higher in the alcohol dependence group than in the normal control group. 3) In the alcohol dependence group, a significant negative correlation among the scores of TCI was between HA and SD, HA and Persistence(PE), ST and SD, and positive correlation between ST and PE, SD and Cooperativeness(CO), Reward Dependence(RD) and CO. Conclusion : These results suggest that shy, fearful, pessimistic and fatigable temperament are related to developing alcohol dependence in Korean males.

Quantitative Analysis on Air-Dispensing Parameters for Manufacturing Dome Lenses of Chip-on-Board LED System

Jeon, Eun-Chae,Lee, Je-Ryung,Je, Tae-Jin,Choi, Doo-Sun,Ham, Young-Bog,Lee, Eung-Sug,Choi, Sang-Kyu,Kim, Hwi Korean Society for Precision Engineering 2014 International Journal of Precision Engineering and Vol.15 No.11

A COB(chip-on-board) LED(light emitting diode) system has advantages such as low cost and good heat dissipation. LED chips are bonded on PCB(printed circuit board) directly without packaging process in case of COB LED systems. Dome lenses made of polymeric resin are generally covered on the bonded LED chips by air dispensing for preventing mechanical damage and making white light. However, it is hard to control the shape of dome lenses precisely due to viscosity of the polymeric resin. We analyzed the relationship of the shape of dome lenses and experimental conditions of the air dispensing in this study. We introduced a new parameter, air pressure * dispensing time, whose physical meaning is impulse per unit area, and obtained much clear relationship of dispensing parameters and shape parameters of the dome lens. This relationship was similar to viscoelastic behavior. The aspect ratio (height over diameter) was increased as the new parameter increased, and was converged to a certain value. The maximum aspect ratio could be calculated by Young's equation of contact angle.

신세대 우울증의 정신병리적 특성

제세령(Se Ryoung Je),안연우(Yun Woo An),Takahiro A. Kato,최태영(Tae Young Choi) 대한생물치료정신의학회 2023 생물치료정신의학 Vol.29 No.3

Objectives: This research probes into the characteristics of modern type depression (MTD) in South Korea, drawing parallels to Japan’s hikikomori state. It aims to bridge cultural value gaps and highlight its significance in South Korea, given the observed reclusive youth behaviors. Methods: Participants undertook a semi-structured interview assessing hikikomori tendencies and MTD. Also, self-reports were done using the 25-item Hikikomori Questionnaire (HQ-25), 22-item Tarumi’s Modern-Type Depression Trait Scale: Avoidance of Social Roles, Complaint, and Low Self-Esteem (TACS-22), Patient Health Questionnaire-9 (PHQ-9), Beck Depression Inventory-II (BDI-II), Young’s Internet Addiction Test (YIAT), Smartphone Addiction Scale-Short form Version (SAS-SV), Revised UCLA Loneliness Scale (RULS), Lubben Social Network Scale (LSNS-6). Scores were analyzed by group (MTD, control) using and logistic regression was done. Additional analysis was done by group (modern type with hikikomori and modern type without hikikomori). Results: Of 59 participants, 29 had MTD. In both groups, age and sex were matched with differences in education years. The MTD group contained 14 hikikomori individuals. Logistic regression identified the HQ-25 as a significant predictor for MTD. Notably, specific components like “low self-esteem” in TACS-22 and “isolation” in the HQ-25 significantly influenced MTD status. HQ-25 and RULS were significantly different between modern type with hikikomori and modern type without hikikomori. Conclusions: Using Japanese diagnostic criteria, this study illuminated MTD in Korean patients. The findings underscore isolation and low self-esteem predicted diagnosis of MTD. As MTD shares common pathological traits with hikikomori, the therapeutic interventions are important in Korea.