휨부재의 인장철근비 변화에 따른 섬유보강에폭시 판넬의 보강효과평가

강성후,박선준,송영국 東新大學校 工業技術硏究所 2003 工業技術硏究 Vol.9 No.-

FREP is a stiffener that is increasingly used in construction fields today. Concerning it, however, the mechanical characteristics of structures reinforced with it, reinforcement design methods, etc. have not been systematically established yet. The present study evaluated the mechanical characteristics of FREP such as fracture behavior, bending stress enhancement, etc. through a bending test using as variables steel ratio of RC beams reinforced with FREP and the thickness of FREP reinforcement. The RC Beams used in the test showed two types of fraction, which were bending tension fraction and edge stripping fracture, and when the ratio of steel ratio (ρ) to FREP ratio (ρ_(F)) is larger than 1.8, it showed edge stripping fracture. Under same reinforcement condition, if steel ratio is relatively low, reinforcement effect appeared to be high. In addition, if reinforcement thickness increases, the flexural rigidity rises and, as a result, the maximum load also increases, but an excessive increase of reinforcement thickness makes stress concentrate on the reinforced end and cause unexpected brittle fracture (edge stripping fracture) even at a light load.

3경간 중로식 아치교량의 풍하중에 대한 동적안전성

강성후,박선준,정철호 東新大學校 工業技術硏究所 2003 工業技術硏究 Vol.9 No.-

Recently, bridges have been momentous as not only regarding function but also concerning aesthetics. However, when beauty is considered in the design, it is also essential that stability and economics be considered. Moreover, when considering stability, an arch bridge is one of the most stable structures. The most important element is a rise ratio when regarding beauty and economics of arch bridges. Only the effect of dead load has been considered to decide the rise ratio. Therefore, in this study, when going over the rise ratio of 3-Span half through type arch bridges, I examined the problems, that the determination of the rise ratio by the dead load has, by adding the factor of a determination of optimum rise ratio, which is not only the effect of the dead load that has been currently considered but also the problem with respect to wind-resistant dynamic stability that is now taken seriously.

유한요소법을 이용한 고성능 콘크리트의 파괴거동

강성후,박선준,박상균 東新大學校 1999 論文集 Vol.11 No.-

As structures made of concrete are getting more high-rise and large-sized, it is necessary to fortify the concrete, the basic material of construction. Concrete's degree of strength is getting more improved due to these basic needs and researches on the subject are actively under way. This study is to predict mechanical behavior and fracture behaviors of high performance concrete. For that purpose, The writer fixed water-cementitious ratio at 33% and used finite element method based upon results of three-point bending tests by having six different types of test pieces with varying mixture ratio of silica fume, water reducer, and superplasticizer. With the finite element method, The writer compared the result of three-point bending test with fracture parameters which was acquired from nonlinear fracture analysis, from which mechanical behavior and fracture behavior of high performance concrete were predicted and usefulness of applied programs was verified.

R.C. 라멘교의 윤하중분포폭 산정식 제안

강성후,박선준,김규형 東新大學校 工業技術硏究所 2001 工業技術硏究 Vol.7 No.-

The wheel load distribution width is used to consider transverse distribution effect when bridge is designed. But, the wheel load distribution width of R.C. slab which has a structural difference is used to design the R.C. rahmen bridge. This study aims to propose equations of wheel load distribution width for R.C. rahmen bridge. MIDAS GENw program, finite element analysis program, was utilized to calculate the wheel load distribution width. Result of finite element analysis that use MIDAS GENw was analyzed by SPSS that is the statistical analysis program. The proposed equations in this study compared with domestic bridge design code and AASHTO LRFD code. These equations can be used usefully when R.C. rahmen bridge design.

노천 발파패턴에 따른 발파상수의 정량적 평가

강성후,박선준 東新大學校 工業技術硏究所 2002 工業技術硏究 Vol.8 No.-

The actual ground vibrations due to prism cut and trench cut blasting at power plant field have been measured, and the data were analyzed using reliability index(β) to the blast constants and attenuation coefficients. In this study, blast vibrations were suggested with wave component parts of ground vibration to the blast patterns, and were suggested with the division of ultimate limit state(,8 =0), serviceability limit state(β=1.28) and safety state(β =3) respectively. The reliability index 0 means 50% data line obtained by the least squares best-fit line. The reliability index 1.28 and 3 represent bounds below 90%, and 99.9% of the data, respectively. The vibration constants K(particle velocity) for prism cut were evaluated to 333, 619, 1419, respectively and the attenuation coefficients of vibrations was -1.94. From this study, inference and analysis methods of vibration equations using reliability theory were established.

파괴에너지를 고려한 콘크리트 배합설계 프로그램

강성후,박선준,노호현 東新大學校 工業技術硏究所 2001 工業技術硏究 Vol.7 No.-

In the concrete structure, there are many possibilities existing cracks that are produced and developed from the infinitesimal crack in the member, fatigue or corrosion being not existing in the early period. Also, it is not enough to explain the fracutre behavior using the strength theory. Because the concrete reach to the shear due to main cracking after developing infinitesimal crack when it is received the tension stress. But it is hard to solve the structural problem of concrete, because current analysis and design methods of structure are based on the strength of concrete. Hence the subject of this thesis is programming the design of automatic mix design program to do automatic concrete mix design and to consider fracutre energy depending on mix condition.

Rat의 복강내에 투여한 5-fluorouracil-polyglycolic acid 제형이 장기에 미치는 영향에 관한 연구

강대영,송규상,최정목,노승무,정경수,오정연,김진향,양준묵,최선웅,이진호,조준식,민병무,김용백,김창식,박근성,김승영,김학용,인현빈 충남대학교 의과대학 지역사회의학연구소 1998 충남의대잡지 Vol.25 No.1

For more effective intraperitoneal chemotherapy, the authers made 5-fluorouracil-polyglycolic acid composite disks(FU-PGA disks) with 5-fluorouracil and polyglycolic acid, a biodegradable polymer. We inserted the FU-PGA disk into the peritoneal cavites of Sprague-Dawley male rats, the control and three experimental groups; one FU-PGA disk insert group(300mg/kg), two FU-PGA disk insert group(600mg/kg), and three FU-PGA disk insert group(900mg/kg). The control group received a similar number of PGA disk inserts. A pharmacokinetic study was performed to measure the 5-fluorouracil concentration in the peritoneal fluid, blood, and tissues(liver, kidney and heart) at 24 hours, 72hours and 168 hours after insertion of the FU-PGA disk. Light and electron microscopic studies were done. The results were as follows: 1) The number of white blood cells and platelets decreased after FU-PGA insertion. The degree was proportional to the duration and amounts inserted. The change in the number of red blood cells varied slightly. 2) Light microscopically, slight changes were noted at 168 hours in the 3 disk insert group (900mg/kg). Mild fatty change and hepatocyte degeneration around the central veins of the liver were noted, with vacuolar degeneration in the proximal convoluted tubules of the kidney. 3) Electron microscopically,the liver showed focal increases of lipid droplets in the hepatocytes, and irregular nuclear membrane with focal nucleolar segregation of the fibrillar and granular elements. Also the double membranous structure of the hepatocytes and Kupffer cells was widened with bleb formation. The kidney showed wide separation of the nuclear double membrane in the proximal convoluted tubular cells and mesangial cells, with vacuolation and myelin figure formation in the mitochondria of the proximal convoluted tubular cells, at 72 hours and 168 hours in the 2 to 3 FU-PGA insert groups. The heart showed focal loss of cristae,vacuolation and myelin figure formation in the mitochondria of the 2 to 3 FU-PGA insert groups. In conclusion, despite the large amont of FU-PGA inserted, the histopathological changes in the liver, kidney and heart were slight, and consonant with the very low amount of 5-fluorouracil concentrations detected in the liver, kidney and heart. The above results suggest that the FU-PGA composite can serve as a new device for releasing drugs in a controlled manner and easily targeted to intraperitoneal organs. This device can improve the efficacy of intraperitoneal chemotherapy for gastric cancer.

어음행위의 표현대리에 관한 소고

강선준 숭실대학교 법학연구소 2007 法學論叢 Vol.17 No.-

현대 상거래에서 어음과 수표는 지급수단으로 매우 유용하게 쓰이고 있다. 상거래가 대리에 의해서 법률행위가 이루어지는 경우에 대부분 유가증권인 어음행위 등도 대리의 법리에 따른다. 어음은 유가증권으로서 유통증권의 성질이 강하기 때문에 배서ㆍ교부 등 어음행위에서 민법상의 표현대리가 그대로 적용하기 어렵다. 어음법은 민법에 대한 특별법적인 지위를 가지기 때문에 민법상의 표현대리의 법리는 어음법상 약간의 수정을 통하여 적용되는 것이 타당하다. 어음행위의 표현대리의 성립에 있어서는 민법상의 원칙에 따라 선의ㆍ무과실일 경우에 표현대리가 성립한다는 주장이 있지만 상법상 중과실을 악의와 같이 취급 하는 점 등을 고려해볼 때 경과실이 있는 자는 보호받을 수 있는 무중과실설의 입장이 타당하다. 어음행위의 표현대리의 상대방이 민법상에는 법률상의 당사자가 대리인의 상대방으로 한정이 되어 있지만 어음이 전전 유통되는 특성상 대리인의 상대방뿐 만 아니라 어음의 전득자 등에게까지 확장되는지 여부에 대해서는 견해가 대립한다. 어음은 거래안전의 보호와 유통성의 이념을 강하게 추구하고 있는 점 등을 미루어 볼 때 제3자의 범위를 확대하는 것이 타당하다. 어음행위의 표현대리가 인정이 되면 민법 제135조에 제1항에 따라 계약상의 의무를 성실하게 이행하거나 손해배상의 책임을 지게 된다. 다만 어음법 제8조의 적용을 검토할 필요가 있다. 본인과 대리인의 책임관계에 있어서 어음법 제8조의 적용을 부정하는 학설과 어음소지인과 양자의 중첩적인 책임을 인정하는 학설, 어음소지인이 본인 또는 대리인 일방에 대해서만 책임을 물을 수 있는 택일설 등으로 나누어진다. 어음소지인은 어음금에 대한 변제를 받게 되면 소기의 목적을 달성하기 때문에 택일설 만으로 충분한 보호가 가능하다. 대리권의 범위를 초과하는 월권대리의 경우 역시 본인과 대리인 사이에 부담하는 책임에 대하여 본인 무책임설, 책임병존설, 책임분담설 등으로 대립되고 있다. 대리의 법리에서 본인의 책임을 일정부분 인정하는 것이 타당다고 생각되므로 표현대리의 법리에 따라 월권대리인이 정당한 사유가 있는 경우 본인은 어음금 전액에 대하여 책임을 져야 한다. 요컨대, 유가증권의 특질을 가진 어음과 어음법의 가장 큰 법적 이념 중의 하나는 유통성의 보호와 권리양도에 관한 법률관계에 있다. 민법상 표현대리의 법리는 무권대리로 법익을 침해받은 당사자를 보호하기 위한 사법상의 원리 중의 하나이다. 그러나 상법이 민법의 특별법이라는 점과 특히 어음은 유통성을 중심으로 하는 거래의 안전을 보호를 최우선시 하는 점 등을 살펴볼 때 어음행위에 있어서는 표현대리 성립에 중과실이 없을 것과 어음행위의 표현대리 상대방을 제3의 전득자 까지 확대하는 등의 수정적용이 필요하다. Recently around the world, millions of business transactions are using the check and promissory note. The more increase the business trade, the more promissory note has important functions and roles as means of payments in modem economic society. In general, promissory note must act by a principal but sometimes it is not, promissory note which is acted by agent who has not unauthorized make many specific problems such as exceeding authority and not vesting the authority. According to the Korea Civil Code, a principal is a responsibility for holder who has deal with agent act in principal's name illegally. Because of the negotiability of the promissory note, there are a lot of serious discussion or the protection and taking care of lights between the bill holder and a principal. However, the Korea Bills of Exchange and Promissory Notes Act regulate only a single article that covers various obligations related to apparent representative agent who has not unauthorized. Therefore this study will examine cases and theories regarding to responsibility under the law and make an alternative plan about the promissory note's agent hasn't rights. In this Thesis, we explained that a third party in good faith and has no gross negligence is able to press a principal or unauthorized agent to take responsibility for the business transaction specially in using promissory note and the limit of application the Korea Civil Code and the Korea Bills of Exchange and Promissory Notes. We have focused on becoming a topic how to protect the promissory note holder in due process and a principal. It is necessary for us to achieve the negotiability of promissory note and protection of the truth of promissory note at the same time and the balance of interests between holder in due process and a principal.

3경간 연속 중로식 강아치교의 내풍안정성을 고려한 라이즈 비 특성

강성후,박선준,최명기 東新大學校 工業技術硏究所 2004 工業技術硏究 Vol.10 No.-

The most important element is a rise ratio when regarding beauty and economics of arch bridges. Only the effect of dead load has been considered to decide the rise ratio. In this study, when going over the rise ratio of arch bridges, examined the problems, that the determination of the rise ratio by the dead load has, by adding the factor of a determination of optimum rise ratio, which is not only the effect of the dead load that has been currently considered but also the problem with respect to wind resistant dynamic stability that is now taken seriously. Synthetically, when deciding rise ratio that is investigated in basic step of design, it is not necessary to consider the evaluation wind resistant dynamic stability. Therefore the result of this research can be summarized as followes ; If it is identify oneself with rise ratio that the divided ratio due to the tie girder of the 3 continuous spans half-through steel arch bridges cannot cause a big effect in stability the wind resistant dynamic stability. If it is identify oneself with the relative stiffness ratio and girder depth ratio of the 3 continuous spans half-through steel arch bridges that the rise ratio proposes that it uses 0.10~0.30, divided ratio due to tie girder proposes that it uses 1.0~2.5 because of the wind resistant dynamic stability and the stress of the hanger. The rise ratio proposes that it uses 0.16~0.18 is given by the Japanese bridge construction association to obtained in investigation equation between an arch span length and the rise, using 0.1~0.2 at the basic design phase and the divided ratio which using 1.5 due to tie girder generally has been employed to main results and very well agrees with a research accomplishment results.

강박스 거더교 콘크리트 바닥판에 발생하는 크리이프와 건조수축에 관한 연구

강성후,박선준,김현일 東新大學校 工業技術硏究所 2002 工業技術硏究 Vol.8 No.-

It studies the non-structural crack factors that are produced in Steel Box Girder Bridge concrete floor plate using analytical method. It mainly studies humidity and design standard of concrete strength. It used MIDAS CIVIL Ver 5.4.0, a general structure analysis program that applies drying shrinkage rate of domestic road bridge design standard and standard value of creep coefficient, CEF-FIP standard equation and ACI standard equation from the aspect of creep, drying shrinkage and hydration heat to see the effect of the two factors on concrete crack and found the following result. The analytical results of this study showed that the initial stress, which was obtained by ACI standard, exceeds the allowable tensile stress between 5 to 18 days. This result means that even if a bridge is designed and constructed according to design standard, the bridge can have cracks due to various variables such as drying shrinkage, hydration heat and creep that produce stress in slab.