인장력을 받는 ㄱ형강 접합부의 감소계수 U값에 관한 연구

표영석,윤성호,나승욱,신영록,김보영,최문식 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)

This study focuses on the inspect of effective net area design code, according to limited state design criteria of steel structures, recently established in Korea, by an experiment on the joint of angle tension members on the ground. reduction factor. The methods of this study were to compare other study results on effective net area rupture mode and ultimate capacity, and to evaluate the propriety of the criteria design code. The result is that code in force limited state design criteria of steel structures and AISC-LRFD joint of angle tension members predicted load and experiment depend on ultimate capacity difference. Therefore, it is thought that there is need for supplemental test and study to effective net area of tension joint focused on bolted connection of angle.

Synergistic effects of alkylated graphene oxide on the properties of polypropylene-based carbon nanocomposites.

Yun, Young Soo,Pyo, Hye-Ri,Lee, Jae Yun,Chin, In-Joo,Jin, Hyoung-Joon American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.10

<P>Polypropylene (PP)/carbon black (CB)-alkylated graphene oxide (AGO) hybrid nanocomposites were prepared via solution process and the synergistic effects of AGO on the properties of the PP/CB nanocomposites were investigated. AGO at a content of only 0.2 wt% formed an overlapped network structure in the PP matrix and affected the electrical, thermal and mechanical properties of the PP/CB nanocomposites. Specifically, PP/CB (5 wt%)-AGO (0.2 wt%) nanocomposites exhibited an electrical percolation threshold at lower CB contents than the PP/CB nanocomposites did, and the sheet resistance was decreased to 2.3 x 10(7) omega/sq. The thermal degradation temperature and recrystallization temperature of the PP/CB (10 wt%) nanocomposites were increased by 11.3 and 1.6 degrees C, respectively, by the addition of 0.2 wt% AGO. In addition, the Young's modulus of the PP/CB (10 wt%) nanocomposite was increased from 438.1 to 540.1 MPa.</P>

Caffeine이 지구성 운동 수행능력에 미치는 영향과 억제성 아미노산에 의하여 활성화되는 이온통로의 조절작용

김은경,김영표,천병옥,이계영,김연정,임백빈,조영욱,김창주,김성수 대한스포츠의학회 1999 대한스포츠의학회지 Vol.17 No.1

To investigate the effect and mechanism of caffeine on endurance exercise, two experiments were performed. First, to test caffeine effect on aerobic exercise, 200-300g Sprague-Dawley rats were used and three groups, control group, low caffeine injection group and high caffeine injection group, were divided. Blood smpling by heart puncture were done at rest, after 30 min treadmill exercise, and after maximal exercise. Blood glucose, free fatty acid concentration were detected and following results were obtained. Glucose concentration showed significant difference between groups(p=0.0305) and also significant changes were exhibited between time(p=0.0004). Free fatty acid concentration had no difference between groups. but had significance between times(p=0.00065). Exercise endurance performance time showed significant difference(p=0.02350 in high caffeine injection group compared to control group. In this experiments, endurance exercise capacity was increased by caffeine injection. Therefore, second experiment was performed to investigate the effect of caffeine on ion current induced inhibitory amino acid neurotransmitter. GABA and glycine. Single periaqueductal gray neuron was acutely dissociated and nystatin perforated patch clamp was performed under voltage clamping condition. Caffeine evoked outward current in PAG neuron dose dependent manner. 1mM of caffeine application had no response. but 3mM caffeine evoked about 32.5±8.539pA outward ion current and 10mM caffeine evoked about 215.46±19.4pA outward current. 10^-2mM GABA activated Cl￣current and recorded by inward current. Caffeine inhibited GABA activated Cl￣ current concentration dependent manner. 10^-2mM of caffeine had no effect on 1-^-2mM of GABA response. but 10^-1mM caffeine inhibited GABA activated Cl￣ current about 5.74±2.13%, 1mM caffeine inhibited about 17.25±2.70%, 10mM caffeine inhibited GABA response about 45.31±7.71%. 10^-1mM of glycine activated Cl￣ current and also recorded by inward current. Caffeine inhibited glycine activated Cl￣ current concentration dependent manner. 10^-2mM caffeine decreased glycine activated Cl￣ current about 4.61±1.650%, 10^-1mM caffeine decreased about 6.49±2.24%, 1mM caffeine decreased about 26.82±4.27%, and 10mM caffeine decreased glycine response about 94.47±1.39%. These results suggest that caffeine inhibite inhibitory amino acid, GABA and glycine, this response causes excitation of CNS and this seems to be the basic mechanism of increasing effect to aerobic exercise performance by caffeine.

데스크탑 밀링머신의 고속 스핀들 설계 해석

장성현,황현영,정우영,홍정표,최영휴 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-

During a decade, there are many researches on microfactory which is the miniature, flexible, and efficient manufacturing system for the micro/meso scale machining device. Moreover many micro machine tool has developed in Japan, U.S., Europe, and Korea. Already we are developing a desktop milling machine with 380×450×450 ㎣ machine size for microfactory or BT (Bio technology) factory. In this study, we carried out the design analysis of a high speed spindle system for our desktop milling machine by using ADROS, which is our own developed S/W for dynamic design analysis of rotor systems. As the result, we obtained some analyzed dynamic characteristics of a spindle system, such as natural frequency, whirl frequency, critical speed, and harmonic response.

심한 골병변으로 발현된 기능성 낭종성 부갑상선 선종

전숙,김영희,박지영,고관표,박철영,김덕윤,우정택,김성운,김진우,김영설,고석환 대한내분비학회 2003 Endocrinology and metabolism Vol.18 No.2

낭종성 부갑상선 선종과 심한 골병변을 동반한 부갑상선 기능항진증은 매우 드문 질환으로서, 저자들은 양측 고관절의 통증을 초기 주소로 내원한 환자에서 고칼슘혈증과 부갑상선 호르몬 증가, 골병변의 방사선적 소견을 통해 부갑상선 기능항진증을 진단하고, 경부 초음파와 컴퓨터 단층 촬영, 부갑상선 스캔검사 및 수술중 부갑상선 낭종액 검사 등을 통해 기능성 부갑상선 낭종의 한 종류인 낭종성 부갑상선 선종을 진단하고 수술적 제거를 통하여 정상화된 1예를 경험하였다. A cystic parathyroid adenoma is rare. A case of primary hyperparathyroidism, with the cystic formation of a parathyroid adenoma and a severe bony lesion, is reported. A 52-year-old male was admitted due to pain in both hips and for evaluation of hypercalcemia. The plasma level of the intact parathyroid hormone (iPTH) was elevated to 1424 pg/mL. Ultrasonography and the computed tomography revealed a parathyroid cyst on the left thyroid lower pole. Parathyroid scintigraphy detected a parathyroid adenoma. A radiograph showed a subperiosteal bone resorption on the phalanges, and a brown tumor (osteitis fibrosa cystica) on the femur shaft was noted. A surgical excision of the parathyroid adenoma was performed. The PTH level in the cystic fluid was increased. A histological examination confirmed a cystic parathyroid adenoma. The PTH level was normalized after the operation (J Kor SOC Endocrinol 18:214-220, 2003).

후두 및 하인두 편평세포암종의 경부곽청술에서 Level Ⅰ의 절제는 필요한가?

최은창,김영호,김동영,이세영,홍원표 대한이비인후과학회 1999 대한이비인후과학회지 두경부외과학 Vol.42 No.7

사범계 체육교육과 지망생들의 기초운동능력검사 기준치 설정에 관한 연구

표내숙,황영성,권오륜,박철준 釜山大學校 附設 體育科學硏究所 2001 體育科學硏究所 論文集 Vol.17 No.-

This study was analyzed the validity and the reliability of evaluation norm, which was used in choosing and grading events of the General Motor Ability Test. The General Motor Ability Test has been done for applicants for entrance to the department of physical education, college of education, Pusan National University. The subjects of this study were 200 applicants(men : 159, women : 41) for three years (1999-2001). They were tested in six events : 1) 100m Dash, 2) 1500m Run (men), 800m Run (women), 3) Wall Bound Pass, 4) Chinning(men),Push Up(wonen), 5) Zig Zag Run, 6) Trunk Flexion. The results could be summerized a s follows: 1. For women, their average records were shown normal distribution in 100m Dash. 1500m Run and Trunk Flexion. But in Wall Bound Pass and Chinning, their records were distributed over two extreme poles. Therefore it's necessary to regulate the interval sizes and rules of Wall Bound pass and Chinning. The interrelation between events were generally reliable. Between 100m Dash and Wall Bound Pass, and between Wall Bound Pass and Chinning are mutually related. so more studies must be done. 2. For women, their average records were shown normal distribution in 100m Dash, 800m Run and Trunk Flextion, too. But the interval sizes of Zig Zag Run. Push Up must be adjusted to higher. Also it's necessary to regulate the interval sizes and rules of Wall Bound Pass like men's instance. it's impossible to analyze correctly interrelation between events because of the small number of subject. From the analysis of the General Motor Ability Test, we could realized the necessity of regulation the standard and interval sizes in several events : Wall Bound Pass and Chinning for men, all events especially Wall Bound Pass for women.

沖積河川에서의 不定流 流砂移送에 관한 수치모델

表永平,申喆植 東新大學校 1996 論文集 Vol.8 No.-

A one-dimensional numerical model for unsteady sediment transport on artificial alluvial river channel is developed. The Lax-Wendroff two-step explicit scheme for water motion and a forward time centered space explicit scheme for sediment motion are developed to simulate the sediment transport rate and the variation of channel bed level. The sensitivity studies show that higher peak stage level, steeper channel slope and longer flooding duration produce more channel bed erosion, and median grain size, D_50=0.4mm give maximum volume loss in this study. Finally, the numerical model is found to produce reasonable results from the various sensitivity tests which reveal that the numerical model has properly responded to changes of each model parameter.

아동의 또래지위와 우정의 질 및 친구간 갈등해결전략과의 관계

김표선,성영혜 숙명여자대학교 아동연구소 2004 兒童硏究 Vol.17 No.2

The purpose of this study is to find to relationship among the children's peer status, friendship quality, and conflict resolution strategie in children's friendship. The object of this study were 417 children in 5th grade of elementary school in Seoul. The measuring instruments used for study were peer nomination developed by Coie and Dodge(1983), Friendship Quality Scale developed by Lee and Koh(1999) and a Scale on Friendship Conflict Resolution Strategies (Rhee, Koh & Oh, 2000). The Collected data was analyzed by SPSSWIN statistical program. The frequency and percentage were calculated to investigate the general characteristics of the subjects. One-Way analysis was performed to find relationship among the children's peer status, friendship quality Mutiple Regression was performend to find relationship among the children's peer status, friendship quality, and conflict resolution strategie in children's friendship. The major results of this study are as follows, First, concerning about peer status and friendship quality, pouplar group have a positive friendship but, rejected group have a conflictive friendship. Second, while popular group used various strategy in conflict resolution, neglected group used evasive strategy. Third, concerning about relation between quality of friendship and frienship conflict resolution strategy, while the group which has high degree of emotional stability, intimacy and human desire used negotiation, cooperation and concession strategy, the group with has low degree of cooperation and pleasure of friendship used evasion and away strategy. Fourth, concerning the effect of friendship quality according to peer status which influence conflict resolution strategy between friendship, each popular, average, rejected and neglected group gas different quality of friendship and according the lower factor of friendship quality, each group has different conflict resolution strategy. Therefore I suggest that according to the peer status, arbitration program should be selected with propriety.

種目別 運動選手들의 競技不安에 關한 調査 : 少年體典釜山市 代表選手를 中心으로 Centering on Representative Athletic Meeting of the Whole of Country Body and Girls in Pusan

表內淑,趙榮濟 釜山大學校 附設 體育科學硏究所 1988 體育科學硏究所 論文集 Vol.4 No.-

The purpose of this study is to develop the standard level of anxiety for competition, which can be effectively used to lessen the level of anxiety and then increase athletic performance in various categories of sports. For this study SCAT method developed by Martens was applied to 22 non players and to 88 players who were to participate in the athletic meeting of the whole of a country boys and girls. The results of my investigation summarized as follows; 1) The scores of SCAT difference wasn't between the groups of elementary school players and middle school players. But the groups of Handball player were t=2.94>t=2.58(p=0.01). The anxiety scores of the groups of middle school players were lower than those of elementary school players. The difference of the score is significant at the level of significance,1%. 2) In the groups of middle school players showed between Track and field players and non players, between swimming player and non players at the level of significance 5%. Namely, the anxiety score of the groups of Track and field and swimming players were higher than those of various categories of sports. 3) The score difference between the groups of individual sport players and that of team sport players showed significant at the level of significance 1%. In the groups of middle school player showed between the groups of individual sport players and that of team sport players were t=3.30>t=2.58(p=0.01). The anxiety scores of the groups team sport players were lower than those of individual sport players. The difference of the score is significant at the level of significance 5%.