Investigation on Delamination Characteristics of 2-Ply Clad Metals and Adhesive Joints for Aluminum/Stainless Steel via the Peel Test

Jun‑Hyung Sim,Yungeun Ha,Min‑Kyun Kim,Min‑Joong Kim,Young‑Rae Cho 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.2

Bonding properties are important for metallic multilayer composites (MMCs) comprising different materials or materialswith different mechanical properties. In this study, we fabricated 2-ply Al/stainless steel (STS) clad metals and Al/adhesive(adh)/STS joints. To manufacture samples with various mechanical properties, T6 heat treatment was performed on cladmetals, and adhesive joints of several thicknesses were prepared. For each sample, the bonding strength was characterizedvia a T-peel test and the results were analyzed using the peeling angle. For 2-ply Al/STS clad metals, the T6 heat treatmentresulted in opposite trends in the mechanical properties. The bonding strength of 2-ply Al/STS clad metals was affectedby the peeling angle, i.e., a small peeling angle provided a small bonding strength at the interface. However, for the 2-plyAl/adh/STS joints, the bonding strength of adhesives on metals depended on each adherend of the stress state. As the differencein mechanical properties between the two adherends increased, the difference in each peeling angle of Al and STSalso increased. The peeling angle of adherends reached a limiting value when the sample contacted the clamping jig head;therefore, a new term, apparent bonding strength (ABS), is necessary to differentiate this new strength from the bondingstrength obtained under non-contact conditions. We believe that the concept of peeling angle and ABS proposed herein willplay a crucial role in describing the delamination behavior and bonding strength of MMCs via the peel test.

인공지능 기반 가상 비서의 BIM 설계 적용에 관한 기초연구

김형준(Kim, Hyung?Jun),전한종(Jun, Han-Jong) 대한건축학회 2018 대한건축학회 학술발표대회 논문집 Vol.38 No.1

In this research, in order to solve the problem of degradation of business efficiency of building design utilizing BIM, a process was constructed using virtual assistant based on artificial intelligence technology. In the constructed process, the designer can learn the command customized to the virtual assistant applied to the BIM architecture design work, using the A-BIM algorithm. These A-BIM algorithms are utilized in the form of artificial intelligence algorithms built in the understanding structure of the designer. As a result, it is expected that the efficiency of operations can be improved by fusing the conventional artificial intelligence technology and the A-BIM algorithm, rather than developing artificial intelligence to be applied to the field of BIM architectural design.

Identification of Genes Modulated by High Extracellular Calcium in Coculture of Mouse Osteoblasts and Bone Marrow Cells by Oligo Chip Assay

Kim, Hyung-Keun,Song, Mina,Jun, ji-Hae,Woo, Kyung-Mi,Kim, Gwan-Shik,Baek, Jeong-Hwa The Korean Academy of Oral Biology 2006 International Journal of Oral Biology Vol.31 No.2

Calcium concentration in the bone resorption lacunae is high and is in the mM concentration range. Both osteoblast and osteoclast have calcium sensing receptor in the cell surface, suggesting the regulatory role of high extracellular calcium in bone merabolism. In vitro, high extracellular calcium stimulated osteoclastogenesis in coculture of mouse osteoblasts and bone marrow cells. Therefore we examined the genes that were commonly regulated by both high extracellular calcium and 1,25(OH)_(2)vitaminD_(3)(VD3) by using mouse oligo 11 K gene chip. In the presence of 10 mM[Ca^(2+)]e or 10 nM VD3, mouse calvarial osteoblasts and bone marrow cells were co-cultured for 4 days when tartrate resistant acid phosphatase-positive multinucleated cells start to appear. Of 11,000 genes examined, the genes commonly regulated both by high extracellular calcium and by VD3 were as follows; 1) the expressions of genes which were osteoclast differentiation markers or were associated with osteoclastogenesis were up-regulated both by high extracellular calcium and by VD3; trap, mmp9, car2, ctsk, ckb, atp6b2, tm7sf4, rab7, 2) several chemokine and chemokine receptor genes such as sdf1, scya2, scyb5, scya6, scya8, scya9, and ccr1 were up-regulated both by high ectracellular calcium and by VD3, 3) the genes such as mmp1b, mmp3 and c3 which possibly stimulate bone resorption by osteoclast, were commonly up-regulated, 4) the gene such as c1q and msr2 which were related with macrophage function, were commonly down-regulated, 5) the genes which possibly stimulate osteoblast differentiation and/or mineralization of extracellular matrix, were commonly down-regulated;slc8a1, admr, plod2, lox, fosb, 6) the genes which possibly suppress osteoblast differentiation and/or mineralization of extracellular matrix, were commonly up-regulated;s100a4, npr3, mme, 7) the genes such as calponin 1 and tgfbi which possibly suppress osteoblast differentiation and/or mineralization of extracellular matrix, were up-regulated by high extracelluar calcium but were down-regulated by VD3. These results suggest that in coculture condition, both high extracellular calcium and VD3 commonly induce osteoclastogenesis but suppress osteoblast differentiation/mineralization by regulating the expression of related genes.

김치에서 분리한 Lactobacillus sp. JC-7과 Lactobacillus acidophilus 88간의 Electrofusion 최적조건 설정

조영배,최현정,백형석,전홍기 부산대학교 유전공학연구소 1997 분자생물학 연구보 Vol.13 No.-

김치 발효 숙성기간을 연장하고 신선도를 오랫동안 유지 할 수 있는 김치발효 starter의 개발을 목적으로 최적숙성기에 있는 김치로부터 bacteriocin생성능이 없는 유산균을 분리하여 동정하였으며, bacteriocin생성능이 우수한 L.acidophilus 88을 융합시키기 위해 electrofusion에 대한 최적 조건을 검토하였다. 분리균주는 Lactobacillus속으로 동정되어 Lactobacillus sp. JC-7이라 명명하였다. Electrofusion에 의해 생성된 융합주를 식별하기 위해 streptomycin(2.5㎎/ml)에 내성을 나타내는 Lactobacillus sp. JC-7변이주와 kanamycin(600㎍/ml)에 내성을 나타내는 L.acidophilus 88변이주를 분리하였다. Electrofusion을 100V/㎝, 120msec(72ohms,1670 capacitance) 에서 수행했을 때 융합효율이 가장 양호하였으며 전기장의 세기와 시간이 중가할수록 융합 효율이 현저히 감소하였다. 2가 양이온은 농도가 중가할수록 대체적으로 융합효율을 감소시키는 경향을 나타내었으나 1mM MGCl_2에서는 대조군에 비해 융합효율이 약간 증가하였다. PEG매개에 의한 융합법의 융합효율을 비교한 결과, 융합효율은 chemical fusion<electrofusion<electrofusion+20% PEG순을 나타내었다. Evaluation of Optimum Conditions for the Electrofusion between Lactobacillus sp. JC-7 Isolated from Kimchi and Lactobacillus acidophilus 88. Young-Bae Jo, Hyun-Jung Choi, Hyung-Suk Baik and Hong-Ki Jun*. Department of Microbiology, Pusan National University, Pusan 609-735,Korea-A lactic acid bacterium was isolated from kimchi. The isolated strain was identified as the genus Lactobacillus thrugh its morphological characteristics and named as Lactobacillus sp. JC-7. The optimum conditions for the electrofusion between streptomycin(2.5㎎/ml)resistant mutant of Lactobacillus acidophilus 88 and kanamycin(600㎍/ml) resistant mutant Lactobacillus sp. JC-7 were evaluated. The highest number of fusants were obtained at a capacitance value of 120msec(1670㎌), a field strength of 100V/㎝,and a pulse controller setting of 72Ω. The potimum pH of elecroporation buffer was 7.5 and the concentration of divalent cation was 1mM MG^2+. Electrofusants were efficiently obtained by addition 20% polyethylene glycol to electroporation buffer. The yield of fusion was better than that of using polyethylene glycol mediated chemical induction.

제 3 대구치 발치시 환자의 호흡 패턴이 스트레스 변화 양상에 미치는 영향

이상명,김형욱,박양호,김진철,박준우,이성준,안재목,Rhee, Sang-Myung,Kim, Hyung-Wook,Park, Yang-Ho,Kim, Jin-Cheol,Park, Jun-Woo,Rhee, Sung-Jun,Nyamdorj, Selenge,Ahn, Jae-Mok 대한구강악안면외과학회 2007 대한구강악안면외과학회지 Vol.33 No.5

Purpose: Heart rate variability(HRV) is the clinical consequence of various influences of the autonomic nervous system(ANS) on heart beat. HRV can estimate the potential physiologic rhythm from the interval between consecutive beats(RR interval or HRV data). It is known as RSA which represents respiration-related HR rhythmic oscillation. Previous studies demonstrated a specific breathing pattern(0.1Hz, 6breaths/min) to improve a physiological body condition related to the stress. In this paper, the level of stress would be evaluated in terms of three phases of the dental treatment, combined with 6breaths/min. Methods: These phases include before, during and after tooth extraction or anesthesia or something.36 patients' stresses were assessed using HRV stress analyzer in each phase in Kangdong Sacred Heart Hospital, and Chuncheon Sacred Heart Hospital, Hallym University Medical Center from Jun. to Sept. of 2007. HRV 5-min data collected were analyzed in time-domain and frequency-domain to evaluate the activity of autonomic nervous system(ANS) which represents the level of stress. Results: All HRV parameters including HF(high frequency), LF(low frequency) and LF/HF ratio showned a significant change affecting the ANS balance. There was a 6.4% difference between R(LF/HF)s on general breathing pattern for balance of Autonomic nervous system, but on controlled breathing pattern, 0.1Hz, was made narrow till 1.4%. The activity of ANS has increased by 1.4% on general breathing pattern, and by 2.9% on controlled breathing pattern, 0.1Hz. Conclusion: After analysis of preoperative stress changes and effect of breathing pattern of 0.1 Hz on the stress in 36 patients who have undergone third molar extraction, following was concluded. In the preoperative stage, the sympathetic change was the greatest?after the?anesthetic injection, and stress was relieved by controlling the breathing pattern to a frequency of 0.1Hz.

우리나라 都市勤勞者들의 政治的 信賴 및 效能感에 관한 硏究 : With Special Reference to the Industrial Areas of Jeonju, Kunsan City 全州地方 工團과 群山市 地域을 中心으로

全炯元 群山大學校 1985 論文集 Vol.11 No.-

It is very meaningful to study the Political Trust and Efficacy of Urban Factory Workers not only because they are contributing to the economic development of our country, and the various problems surrounding them are gradually worsened, but because to catch their political behaviors is crucial to the formulation of reasonable labor policies and thus obtaining their effectiveness. Therefore the purposes of this thesis are firstly to point out general level of urban factory workers' political trust and efficacy, secondly to find out variables which affect their political behaviors and finally to explain the relationship between variables to be found and level of their political trust and efficacy. To measure the urban factory workers' political behaviors we implemented the research survey through a questionaire with the samples of 300 factory hands who work at the industrial areas of two cities, Jeonju and Kunsan. Collected data were analyzed using the method of statistical analysis, Chi-Square(X?). Their political behaviors are compared and categorized by "Paige's Model," 'Efficacy-Trust 4 Combinations," which is composed of 4 types of behavior, allegiant, subordinate, dissident, alienated. Two main hypotheses and seven subhypotheses were established. Concerning the hypotheses the major findings of this study are as follows: 1. Urban factory worker's efficacy and trust all are high in Korea. 2. They have allegiant political behavior. 3. With the relations between the personal attributes and their behaviors, those who are female, younger have relatively higher trust. 4. With the relations between the socio-economic characteristics and their behaviors, those who have the higher degree of satisfaction of the social distribution, of rationality, have relatively higher trust. 5. There is a significant relation between the only factor, the degree of satisfaction of social distribution of wealth among the socio-economic variables and their political efficacy. The higher degree of satisfaction is, the lower political efficacy becomes. Finally, I would like to make a point of suggestion with reference to the findings above. To ascertain if hypotheses of this study have high generality we need to make a comparative study through other areas in Korea.

眞空中에 있어서 金屬被膜의 潤滑特性

金泰玉,金亨資 동아대학교 공과대학 부설 한국자원개발연구소 1994 硏究報告 Vol.18 No.2

The space world under zero gravity and super vacuum has only friction and inertia when the space machine works. The friction is always in contact surface and unsteady. The surroundings under super vacuum make surface friction more complicate. Therefor method to stably lubricate friction surface for long time in space machine is very important. Actived new surface by friction under super vacuum is optimally supplied by lubrication film of soft metal's vapor film. Lubricating film bonded soft metal vapor film prevent bond of same kind base metal from toughness and make a limit low friction.

서울시 수유동 단독주거지의 확장에 따른 주거지 변화특성에 대한 연구

전병권,김형우 대한건축학회 2004 대한건축학회논문집 Vol.20 No.4

This study would analyze, making an independent residential site formed after the Korean War and its surrounding area an object of research, a residential circumstance of a residential area considered in complex plan dimension and of a nearly residential area naturally formed, while laying stress on a transitional aspect, each characteristic and an interrelation. Through analysis of the transitional aspects of these residential circumstances, the researcher obtained the following findings; First, a difference in physical structure of residential area was a fundamental element which determines quality of residential circumstances at the early stage of its formation, but later on it became a favorable condition for new construction activities. Second, from the analysis of a unit lot, it's found that while new construction activity in the public housing complex area was given preference in a lot in which residential circumstance was backward, its surrounding residential area was developed centering around a favorable lot in a given condition for land. Third, though there was a significant difference showing in the composition of road and unit block between the two areas, a discriminating property in the process of resolving the problem of securing receptive spaces following the increase of cars was not found, and with insufficient open space, traditional life mode, in which open external space is centered, was conducted into closed internal one. Fourth, in case of the object area of analysis, positive development of common residence-type housing after the late 1970's from the first generation single housing at the age of constructing the complex was made. From this analysis, the necessity of recognizing the limitations of development mode of existing housing units for the reception of a rapid increase of population and for copying with rapidly changing life mode and for the betterment of physical circumstance has been proposed, and a new alternative idea for the reform of residential circumstances of the complex would be needed.

정책 집행력 제고를 위한 품질관리 기법 도입에 관한 연구

전형원 군산대학교 지역개발연구소 1999 地域開發硏究 Vol.11 No.-

품질관리에 관한 이론적 연구

전형원 군산대학교 지역개발연구소 1996 地域開發硏究 Vol.8 No.-

Today's Government is being pressured to change its management by the surrounding environment. Namely, It is continuously being called upon to focus on achieving customer satisfaction, to make continuous improvements, and to give everyone responsibility. American Government has already introduced the so-called Quality Management which first developed in the private sector and spread to many public organizations. The results from a variety of researches show surprising success. This paper does a theoretical research on the basic structure of Quality Management for the basement of its application toward Korean Government; with a special emphasis on the steps, the tools and techniques.