전기저항식 로드셀을 이용한 균등긴장시스템 개발 및 성능실험

박원태(Park Weon-Tae),천경식(Chun, Kyoung-Sik) 한국산학기술학회 2016 한국산학기술학회논문지 Vol.17 No.2

MS(Multi-Strand) 케이블은 여러 개의 강연선으로 이루어져있어, 케이블 시공시 각 강연선을 차례대로 개별적으로 긴장한다. 그리고 마지막 강연선이 정착되었을 때, 모든 강연선에 동일한 장력이 도입되어야하며, 이것이 MS 균등긴장의 핵심기술이다. 본 연구에서는 엑스트라도즈(Extradosed)교 및 사장교의 사재케이블(Stay Cable)에 적용되는 2,200MPa 초고강 도 강연선들을 균등하게 긴장, 제어할 수 있는 MS 케이블 균등긴장시스템을 개발하였다. 개발한 균등긴장시스템은 전기저항 식 로드셀, 유압잭, 유압펌프 그리고 통합제어기로 구성되며, Master 강연선과 Slave 강연선의 장력변화를 실시간으로 예측하 며 제어하는 알고리즘을 탑재하였다. 개발시스템의 기능과 성능을 검증하기 위해 균등긴장 실험을 수행한 후, 광양 태인2교 (ED교)의 사재케이블 가설긴장에 성공적으로 적용하였다. Because MS(Multi-Strand) cables consist of many strands, a jacking force is applied to each strand one by one for cable construction. All strands should have an equal tensile force when the last one is wedged. This is the core technology for MS iso-tensioning. In this study, a new MS cable iso-tensioning system was developed for controlling and jacking the high-strength strands, with an ultimate tensile strength of 2,200MPa, for a stay cable of extra-dosed/cable-stayed bridges. The newly developed iso-tensioning system consists of electrical resistance load cells, hydraulic jacking devices, hydraulic pumps, and integrated controllers. Moreover, it is embedded with an algorithm that can control and predict the variations in tensile forces of the Master and Slave strands in real time. Actual experiments were carried out to verify the function and performance of the newly developed system. This system was applied successfully to the stay cable construction of 2nd Tae-in extra-dosed bridge in Gwangyang.

갑상선기능항진증과 원발성항인지질항체증후군에 동반된 무도병 환자 1례

박종원,김동현,박태환,권오상 대한신경과학회 1998 대한신경과학회지 Vol.16 No.2

통일비용 조달방안 및 통일정책에 관한 연구

장원태 경복대학 1998 京福論叢 Vol.2 No.-

통일비용 조달방안은 크게 국내에서 조달하는 방안과 해외에서 조달하는 방안으로 나눠볼 수 있다. 남한에서의 자금 조달 방안으로서는 ▲증세 ▲행정·재정개혁을 통한 재정기반 강화 ▲채권발행 ▲민간자금 동원 ▲국유재산불하 ▲군비 감축 등이 있다. 해외자금의 조달 방법에는 직접투자 유치, 증권투자, 차관도입, 일본의 배상금, 국제적 북한 지원기금, 프로젝트 파이낸싱(Project financing)등이 있다. 한편 정부는 다음과 같은 노력이 필요하다. 첫째, 정부가 비용이 가장 적게 드는 방식으로 통일을 추진해야 한다. 둘째, 통일정책은 통일비용에 대한 지불능력을 향상시켜 나가는 방향으로 추진되어야 한다. 셋째, 통일의 당위성과 통일에 따르는 편익을 국민에게 제대로 인식시키도록 노력해야 한다. 넷째, 국민들로 하여금 통일의 가능성에 대해 확신을 갖도록 해야한다. 다섯째, 국민들이 자발적으로 호응할 수 있는 통일재원조달 방안을 마련해야 한다. 여섯째, 국내산업의 경쟁력을 강화해야 한다. 일곱째, 통일 자발적으로 호응할 수 있는 통일재원조달 방안을 마련해야 한다. Having to raise more the cost of reunification than the people are willing to pay, the government can face tax resistance. Therfore, we must think other methods. Their methods are an increase in government debt through bond issues, participating private capital, enforcing fiscal foundation though government reform, reducing military force, inducing foreign capital, and using project financing Meanwhile, It can take the following preemptive measures. 1. Follow plans to minimize cost of reunification and minimize negative sentiments arising from the cost 2. Help the North help itself by increasing South's economic aid to the North. 3. Instill positive attitude in South Korean tax payers about the benefits of reunification. 4. Instill confidence in realization of reunification. 5. Prepare polities to secure funds through voluntary cooperation. 6. Strengthen domestic economy. 7. Maximize return on investments made in the North.

ESPI 기법을 이용한 폴더식 정보 통신기기의 힌지부 내구 수명 평가

이태훈,장석원,장경영 한국비파괴검사학회 2004 학술대회 논문집 Vol.- No.-

Folder type electronic devices have hinge to support the rotational motion of folder. This hinge is stressed by the rotational inertia moment of folder at the maximum open limit position of folder. This stress is repeated whenever the folder is open, and it is a cause of hinge fracture. In this paper, the reliability evaluation for the hinge fracture in the folder type cellular phone is discussed. For this, the durability testing machine using crack-rocker mechanism is developed to evaluate the life cycle of the hinge, and the degradation after repetitions of opening and shutting is evaluated from the deformation around the hinge, where the deformation is measured by ESPI (electronic speckle pattern interferometer). Experimental results showed that ESPI was able to measure the deformation of hinge precisely, so we could monitor the change of deformation around the hinge as the repetition number of folder open is increased.

복합적층 원뿔형 쉘의 링 보강효과 연구

박원태,최재진,손병직 한국안전학회 2004 한국안전학회지 Vol.19 No.1

In this study, composite laminated conical shells with ring stiffeners are analyzed. A versatile 4-node shell element which is useful for the analysis of conical shell structures is used. An improved flat shell element is established by the combined use of the addition of non-conforming displacement modes and the substitute shear strain fields. The proposed element has six degrees of freedom per node and permits an easy connection to other types(beam element) of finite elements. And 3-D beam element is used for ring stiffeners. Optimum location and optimum section properties of ring stiffeners are obtained. It is shown that the thickness of conical shell is reduced about 201/o by optimum ring stiffeners.

트리아민-구리(Ⅱ)-이미다졸염 착물의 촉매작용에 관한 연구

김태원,홍순영,민재기,김창석 漢陽大學校 環境科學硏究所 1992 環境科學論文集 Vol.13 No.-

Acetylsalicylic acid의 가수분해 반응에서 imidazole과 몇 가지 triamine-copper(Ⅱ)-imidazolate complex들의 촉매효과를 비교 하였다. 촉매로서는 imidazole(ImH)과 그 2- 또는 4-치환 유도체, diethylenetriamine-copper(Ⅱ)-imidazolate complex(C₂C₂CuIm)와 그 imidazole-ring 치환 유도체 및 N-(2-aminoethy1)-1, 3-propanediamine-copper(Ⅱ) imidazolate complex(C₂C₂CuIm)와 그 imidazole-ring 치환 유도체들을 택하였다. 촉매효과의 비(kcat값으로 비교)는 ImH : C₂C₂CuIm = 1.00 : 2.81 : 2.66로 나타났으며 촉매의 효과는 이들 complex의 imidazole-ring의 전자주는 치환기에 의해 증가 하였다. Catlytic effects of imidazole and several of triamine-copper(Ⅱ)-imidazolates were investigated for the hydrolysis of acetylsalicylic acid. As catalysts, imidazole(ImH) and its 2- or 4-substituted derivatives, diethylenetriamine-copper(Ⅱ)-imidazolate complex(C₂C₂CuIm) and its imidazole-ring substituted derivatives, and N-(2-aminoethyl)-1, 3-propanediamine complex(C₂C₂CuIm) and its imidazole-ring substituted derivatives were chosen. The ratio of efficiency among these catalysts was observed to bh ImH : C₂C₂CuIm : C₂C₂CuIm = 1.00 : 2.81 : 2.66, and the effect of catalytic action was enhanced by an electron-releasing substituent on imidazole-ring of the complex.

生理活性物質의 生産 : Ⅰ. 枸杞子로부터 callus 및 multiple shoot의 誘起

김대현,김병원 東國專門大學 1994 金龜論叢 Vol.2 No.1

본 硏究에서는 藥用植物인 구기자의 大量增殖을 통한 藥用成分의 大量生産 및 藥理效果의 臨床的 適用 可能性을 조사하고자 구기자葉으로부터 shoot를 大量增殖 시킬 수 있는 方法과 캘러스를 誘導하는 方法을 調査하고자 하였다. 구기자葉으로부터 캘러스의 誘導는 0.001㎛의 BA와 5㎛의 2,4-D 濃度에서 가장 좋았다. 대량증식을 위하여 구기자葉으로부터 multiple shoot를 誘起시킨 결과, 2㎛의 BA와 0.2㎛의 NAA, 4%의 sucrose, pH 5.6, 그리고 0.2% casein hydrolysate를 첨가시 葉조직 切片당 약 40.6개의 shoot가 誘起되었다. 그리고 배양 6주후 대량증식된 2cm 크기의 shoot는 截取하여 MS배지 농도를 1/4-8/4로 稀釋한 培地에 移植한 결과, 줄기의 伸長은 6/4MS 그리고 뿌리의 발근율은 7/4MS에서 가장 양호하였으며, 재분화된 소식물체들은 5주간의 순화과정을 거쳐 일반토양에 活着시킬 수 있었다.

보강재로 보강된 개방 원뿔형 쉘의 해석

박원태,최재진,손병직 한국안전학회 2004 한국안전학회지 Vol.19 No.4

In this study, open conical shells with ring and stringers are analyzed. A versatile 4-node shell element which is useful for the analysis of conical shell structures is used and 3-D beam element is used for stiffeners. An improved flat shell element is established by the combined use of the addition of non-conforming displacement modes and the substitute shear strain fields. The proposed element has six degrees of freedom per node and permits an easy connection to other types(beam element) of finite elements. Optimum location and optimum section properties of ring and stringer are obtained. It is shown that the thickness of conical shell can be reduced about 20~50% by appropriate location of stiffeners.

비호지킨 림프종의 임상적 고찰

김태원,조은택,조기섭,정재용,허재봉,장영,박유환,정춘해 조선대학교 1995 The Medical Journal of Chosun University Vol.20 No.1

A retrospective clinical and histologic study of 30 non-Hodgkin's lymphomas diagnosed at the Department of Hemato-oncology of the Chosun University from January 1989 to December 1993 is presented. Among total 30 cases whose sexes were mentioned, male were 18 and female were 12 and the ratio is 1.5:1. The peak incidence of non-Hodgkin's lymphoma was found in the third decade. The case distributions by Working formulation were summarized in table 3. The most common histopathologic type of non-Hodgkin's lymphoma was the diffuse large cell type of intermediate grade. The presenting symptoms at the time of first visit to the hospital were summarized in table 4. The most common symptoms were palpable mass. Lymph node enlargements were found in 87 %, and most frequently on cervical area(35%). The incidence of primary nodal lymphoma is more frequent than extranodal lymphoma, 1.2:1. The most common primary site of extranodal lymphoma is the gastrointestinal tract. In the laboratory findings, the data of hemoglobin and hematocrit were summarized in table 8, 9, Values of hemoglobin and hematocrit of female patients greater than those of male patients. The results of the immunophenotypings of nodal and extranodal lymphoma indicates that the B-cell lymphoma are predominant(B:T=1.4:1). The clinical stage was Ⅱ in 9 cases(30%) Ⅲ in 9 cases(30%), Ⅳ in 8 cases(26.7%), Ⅰin 4 cases(13.3%), 28 cases were treated with CHOP regimen. Among them, 17 cases(60.8%) achieved a complete remission. 5 cases had a partial response. The most frequent toxicities were toxic hepatitis.

Laves상 ZrV_2계 수소저장합금 전극의 Ni 치환에 따른 열역학적 안정성에 관한 연구

조태환,최원경 단국대학교 2000 論文集 Vol.35 No.-

Thermodynamic properties of laves phase ZrV_2 were studied in terms of the equilibrium hydrogen pressure. ZrV_2 alloy with high equilibrium hydrogen pressures at room temperature, which is usually difficult to charge, was substituted with Ni partialy. Partial substitution of Ni made not only the equilibrium pressure to be reduced remarkably, but also the enthalpy change depending on the formation of metal hydride to be agreed to the value in gas phase reaction and electrochemical reaction.