내풍설계를 위한 초고층 무량판 건축물의 횡강성 및 고유주기 산정

박제우,김홍진,조지성,Park, Je-Woo,Kim, Hong-Jin,Jo, Ji-Seong 한국전산구조공학회 2010 한국전산구조공학회논문집 Vol.23 No.1

건축물의 풍진동은 건축물의 사용성평가에 중요한 구조설계 요인 중 하나이다. 신뢰성있는 풍하중 및 풍진동을 구하기 위해서는 정확한 고유주기의 예측이 필요하며 이러한 고유주기에 오차가 있을 경우 하중을 과대 또는 과소평가하게 되는 문제를 유발한다. 본 논문에서는 최근 본격적으로 증가하고 있는 초고층 무량판 구조시스템의 건축물에 대하여 계측을 통한 횡강성 산정식의 유효성을 검정하였다. 이를 위하여 최근 건설된 초고층 무량판 구조시스템이 적용된 3개의 건물에 대하여 계측 결과와 해석 모델의 고유주기를 비교 분석하였다. 이때, 무량판 구조물의 횡강성에 영향을 미치는 요인들에 대하여 각 케이스별로 해석을 수행하였으며, 특히 일반적으로 사용되고 있는 콘크리트의 할선탄성계수와 동탄성계수가 적용 되었을 때의 구조물의 고유주기 변화를 비교하였다. 그 결과 풍진동에 의한 건물의 변형률은 매우 적기 때문에 할선탄성계수의 적용보다는 동탄성계수의 적용이 보다 정확한 해석의 결과를 가져올 것으로 판단된다. Wind-induced vibration is one of the important structural design factors for serviceability of tall buildings. In order to evaluate the reliable wind-loads and wind induced-vibration, it is necessary to obtain the exact natural period of buildings. The discrepancy in the natural period estimation often results in the overestimation of wind loads. In this study, the effectiveness of lateral stiffness estimation method for tall buildings with flat plate system is evaluated. For this purposed, the results of finite element analysis of three recently constructed buildings are compared with those obtained from field measurement. For the analysis, factors affecting on the lateral resistance such as cracked stiffness of vertical members, elastic modulus of concrete, effective slab width, and cracked stiffness of link beam are considered. Form the results, it is found that the use of non-cracked stiffness and application of dynamic modulus of elasticity rather than initial secant modulus yields closer analysis result to the as-built period.

비정상 주행패턴 분석을 통한 WIM 시스템 개선 연구

박제우 ( Park Je-u ),김영백 ( Kim Young Back ),정경호 ( Chung Kyung Ho ),안광선 ( Ahn Kwang Seon ) 한국인터넷정보학회 2010 인터넷정보학회논문지 Vol.11 No.4

WIM(Weigh-In-Motion) 시스템은 고속으로 이동 중인 차량의 무게를 측정하는 시스템이다. 기존의 WIM 시스템에서는 등속을 기준으로 차량의 무게를 측정하며 오차율이 10% 범위에 있다. 하지만 운전자의 가ㆍ감속 조작과 같은 비정상 주행패턴을 고려하고 있지 않으므로 실제 오차율은 더욱 크다. 이러한 오차를 최소화하기 위해서 비정상적인 주행패턴을 찾고 이를 적용한 개선된 WIM 시스템이 필요하다. 본 논문에서는 기존의 WIM 시스템의 오차율에 영향을 미치는 비정상 주행패턴을 분석하고 오차율을 최소화하는 개선된 WIM 시스템을 설계한다. 개선된 WIM 시스템은 기존의 시스템에 루프센서를 추가한 다단 루프구조를 가진다. 또한 내부적으로 정의된 측정 함수를 개선하여 비정상 주행패턴별로 측정된 무게를 보정한다. 실험 분석 결과 개선된 WIM 시스템은 기존의 최대 평균 오차율 22.98% 에서 8% 미만으로 오차율이 감소한 사실을 알 수 있다. WIM(Weigh-In-Motion) is the system measuring the weight of the vehicle with a high-speed. In the existing WIM system, vehicle weight is measured based on the constant speed and the error ratio has 10%. However, because of measuring the driving pattern, that is abnormal driving pattern which is like the acceleration and down-shift of the drivers, it has the error ratio which is bigger than the real. In order to it reduces the error ratio of WIM system, the improved WIM system needs to find the abnormal driving pattern. In order to reducing the error ratio of these WIM systems, the improved WIM system can find abnormal driving patterns. In this paper, the improved WIM system which analyzes the abnormality driving pattern influencing on the error ratio of WIM system of an existing and minimizes the error span is designed. The improved WIM system has the multi step loop structure of adding the loop sensor to an existing system. In addition, the measure function defined as an intrinsic is improved and the weight measured by the abnormal driving pattern is amended. The analysis of experiment result improved WIM system can know the fact that the error span reduces by 8% less than in the existing the maximum average sampling error 22.98%.

경량바닥판의 진동해석을 위한 유한요소모델링 및 실험검증

박제우(Park, Je-Woo),김홍진(Kim, Hong-Jin),조봉호(Cho, Bong-Ho),하태휴(Ha, Tae-Hyu) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.10

Due to the lack of design standard and the difficulty of analysis, the vibration analysis of lightweight floors has received less attention than typical structural analysis. In this paper, the finite element model for lightweight floors is presented based on rigid link and realistic support restraints. The rigid rink is used to solve the problem of difference in the centroid of beam, joist, and flooring material and to guarantee the same behavior of those members. Two different support restrains, all fixed restraint and mixture of fixed and released restraint, are used in the analysis. The finite element model is verified through the impact loading test of the real scale floors that have different joist condition and middle beam. The finite element analysis results indicate that the different joists having same moment of inertia yield similar natural frequencies, while the test results of real scale floors shows that the closed shaped joist floor yields higher natural frequency than the open shaped joist floor. The test results also indicate that the finite element analysis using the mixture of fixed and released support restraint yields closer natural frequencies to those of actual floors.

난소홀몬이 가토 Insulin 131I 대사에 미치는 영향

박제우(JW Park) 대한산부인과학회 1966 Obstetrics & Gynecology Science Vol.9 No.11

Twenty one of ovariectomized rabbits were divided into 3 groups: the first group for control, the second group for estrogen stimulated group and the third group for progesterone stimulated group. In each group, after a single injection of insulin-131I(30-100μc.), blood samples were withdrawn at the interval of 10 minutes for 50 minutes and plasma disappearance of injected insulin-131I with time were observe. On the other hand, 50 minutes after injection of insulin-131I of plasma-time curves, turnover rates of insulin and half time, which is the time required to turnover a half insulin pool, were valulated from each group. On the other hand, 50 minutes after injection of insulin-131I, animals were sacrificed and various tissues were excised. Weighed tissues were mixed with 10% trichloroacetic acid(TCA) in motor and divided into 2 fractions by centrifugation. Each fraction of tissue homogenate was counted for radioactivity by means of well type scintillation counter. Insulin-131I spaces in various tissues were calculated by obtaining the ratio of radioactivities of TCA precipitable fractions of tissues to that of plasma, while 131I compound space, which is the distribution spaces of degradated products of injected insulin-131I, were calculated with ratios of radioactivities of TCA soluble fraction of tissues to that of plasma. Alterations in turnover rates of insulin by ovarian hormons were analyzed by connection the distribution spaces of insulin-131I in various tissues of each group. 1) After a single injection of insulin-131I, plasma disappearance of insulin-131I was decreased exponentially with time showing straight line on the semilogarithmic paper. Therefore, turnover rate can be calculated by obtaining the slope of radioactivities of plasma insulin-131I vs. time curve and also half time(t½)of insulin turnover by the first order kinetic equation. The turnover rate of insulin was mean of 1.90%/min. in the first group, 2.53%/min. in the secon group and 2.18%/min. in the third group. These data showed that turnover rates of insulin were increased by stimulation with ovarian gormones. 2) Insulin-131I space in the kidney tisseue showed most highest value and averaged about 700%, which value represents about 7 times of concentration of plasma insulin-131I in the kidney. In the other tissues insulin-131I space were decreased by in order of spleen, skin, heart, liver, small intestine, uterus, adipose, skeletal muscle and brain tissues. However, there were little differences in insulin-131I space between control and ovarian hormone stimulated groups. 3) In order to observe the degradation of insulin in various tissues, 131I compound spaces were determined by ratio between radioactivities of TCA soluble fractions of tissues and plasma. 131I compound spaces in kidney, liver, spleen and adipose tissues showed more than 100%, in which tissues radioactivities of TCA soluble fractions were more concentrated than in the plasma. It seems that these tissues would be principal sites of insulin degradation. In the other tissues, 131I compound spaces were decreased by in order of small intestine, heart, skin, uterus, skeletal muscle and brain tissues. However, there are remarkable increase in the 131I compound spaces of kidney and liver which have insulinase system by stimulation of ovarian hormones and also degradation of

LCVA를 이용한 초고층 주거용 건물의 풍진동 저감

박제우(Park Je-Woo),김흥진(Kim Hong-Jin),이광재(Lee Kwang-Jae),김대근(Kim Dai-Keun),조지성(Jo Ji-Seong) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)

Increasing heights of tall buildings often require supplementary damping system for occupant comfort in windy condition. This paper presents a liquid column vibration absorber (LCVA) installed in a 64-story building, which is the highest residential building with flat plate structural system in Korea, for mitigation of wind-induced motion. LCVA is a special type of secondary mass-type dampers relying on the motion of a column of liquid in a U-shaped container to counteract the forces acting on the structure. Since it has different dimensions for vertical and horizontal portions of container, it has benefits of easy tuning and wide natural frequency range. To evaluate the control performance of LCVA, an experiment using 1/20 scaled model is performed. The test structure is excited using a sinusoidal signal ranging 0.1~3.0㎐ with 5.5㎜ displacement, and acceleration and displacement of the structure, water height, and shear force are measured. Experiment results indicate that the LCVA increase the energy dissipation capacity of the building significantly

모바일 네트워크 사용자의 패킷 송신 및 수신에 대한 비교 분석

박제우(Jewoo Park),박재성(Jaesung Park) 한국통신학회 2015 한국통신학회 학술대회논문집 Vol.2015 No.06

유한요소법을 이용한 경량바닥판의 진동 해석 및 평가

박제우(Park Je-Woo),김홍진(Kim Hong-Jin),조봉호(Cho Bong-Ho),하태휴(Ha Tae-Hyu) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(구조계)

In this paper, the finite element model for lightweight floors is presented based on rigid link and realistic support restraints. Two different support restrains, all fixed restraint and mixture of fixed and released restraint, are used in the analysis. The finite element analysis results indicate that the different joists having same moment of inertia yield similar natural frequencies, while the test results of real scale floors shows that the closed shaped joist floor yields higher natural frequency than the open shaped joist floor. The test results also indicate that the finite element analysis using the mixture of fixed and released support restraint yields closer natural frequencies to those of actual floors.

면역전기영동법에 의한 자궁경관점액중의 혈청단백에 대하여

박제우(JW Park),권영조(YJ Kwon),임수덕(SD Lim) 대한산부인과학회 1966 Obstetrics & Gynecology Science Vol.9 No.11

In recent years the analysis of the protein components in the cervical mucus has drawn more attention with respect to the possible occurrence of a biologic infertility cause by an immune reaction between sperm antigen and cervical mucus antibodies, and antimicrobial prophyractic immunity. Immunoelectrophoretic studies on cervical mucus have already been undertaken by several workers, but there is not complete agreement as regards to proteins in cervical scretions obtained from nonpregnant women as yet probable due to differences in techniques used. It was the purpose of this study to investigate in single, undiluted specimens the appearance of serum proteins in cervical mucus of Korean women during different stages of the menstrual cycle. Summary 1) A complete study of the proteins of normal cervical mucus has been made by immunoelectrophoresis in cases of Korean women. 2) Albumin, transferrin, and gamma globulin(IgG) were always found, and in the half of the cases alpha-2 globulin and IgA were present. 3) No significant differences in protein component of cervical mucus were found in regard to menstrual cycle. 4) The possible role of cervical mucus(especially, IgG and IgA) in the production of biological infertility and antimicrobial prophylactic immunity was discrssed together with the limits and merits of the immuno elctrophoretic method in the study of the cervical mucus.

스크류 형 건식진공펌프 기술 현황 및 응용

노명근,황태경,박제우,Noh, Myung-Keun,Hwang, Tae-Kyoung,Park, Jea-Woo 한국진공학회 2008 Applied Science and Convergence Technology Vol.17 No.4

반도체 및 디스플레이 공정과 같이 진공의 높은 청결도의 진공이 필수적으로 요구되어 지는 산업분야가 확대됨에 따라 건식진공펌프의 중요성은 급격히 증대되어 왔다. 다단루츠형 진공펌프와 함께 건식진공펌프 양대 축의 하나를 형성하는 스크류형 건식진공펌프는 공정부산물 발생이 많은 고 난이도 응용분야에서 그 장점을 발휘하여 왔다. 최근 들어 에너지 효율이 획기적으로 개선된 스크류형 건식진공펌프의 개발이 활발히 진행되고 있다. 이 총설논문에서는 스크류형 건식진공펌프의 전반적 기술사항들을 살펴보고 실제 반도체 공정에의 응용 및 스크류형 건식진공펌프의 향후 발전 방향에 대하여 살펴보았다. As the industry requiring clean vacuum condition like semiconductor and display manufacturing expands, importance of dry vacuum pumps has been increased. Screw-type dry vacuum pump, occupying major share with multi-stage roots pump in dry-pump market, has big strength specially in harsh application area accompanying serious by-product accumulation. Recently, development in screw-type pump has been focused on improving energy efficiency. In this article, technology of screw-type dry vacuum pump is reviewed and the requirement for actual industrial application is considered. In addition, the expected evolution for screw-type dry pump in near future is also described.

건물의 상시진동과 인력가진에 의한 동적특성 계측 비교

장영주(Jang Young-Ju),박제우(Park Je-Woo),이지훈(Lee Jee-Hoon),김홍진(Kim Hong-Jin) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)

This paper is concerned with comparisons of dynamic property by transient vibration and synchronized human excitation. Dynamic property including damping ratio and natural frequency is very important data of stability and usability of building. To obtain the reliability data, experiments were conducted to six buildings ranging from four to twelve stories. Dynamic property was analyzed by measuring transient vibration and synchronized human excitation using natural frequency of building. The synchronized human excitation measurement is finding dynamic property from obtained through free vibration wave after sympathy by human excitation using natural frequency of building. From the analyzed results, synchronized human excitation was more reliable data than transient vibration measurement about first mode.