긴 말뚝기초의 축하중 전이 거동에 관한 연구

김명학,이호근,이성철,김상현 인제대학교 1999 仁濟論叢 Vol.14 No.3

현행 우리 나라 말뚝 기초는 대부분 선단 지지 말뚝으로만 설계되어 말뚝 주변에서 크게 발휘되는 주변 마찰력을 무시하므로 매우 비경제적인 설계가 이루어지고 있고, 뿐만 아니라 말뚝 축하중 전이 거동은 전혀 반영하지 못한 추정 설계 (또는 예비 설계) 만이 이루어지고 있는 실정이다. 본 연구에서는 국내 외의 말뚝 설계 사례들을 각 지반 종류별로 선정하여, 이들을 APILEPLUS로 해석하여 예측된 계산치와 측정된 결과치 들을 분석하여 축하중 전이 특성을 고찰하였다. 하중 전이 실험이 수반된 말뚝 정재하 시험 결과, 주변마찰력의 전지지력에 대한 비율은 점성토의 경우 80%를 상회하였으며, 사질토의 경우 70% 정도였다. 그리고, APILEPLUS에 의한 예측 결과에 대한 마찰력 분담률은 점성토의 경우 95% 이상이었으며, 사질토의 경우 60-70% 정도였다. 말뚝 선단이 단단한 지층에 관입되어 있더라도 사질토층 이외의 지층에서는 마찰력에 의해 지지되고 있으며, 사질토층에서도 상대관입 깊이가 10 이하로 극히 작은 단말쪽이 아닌 경우에는 마찰력이 전체 극한 지지력의 20%이상을 차지하고 있었다. 따라서, 현행 설계 개념에서 무시하고 있는 마찰력을 고려한 설계를 수행할 때에 비로소 말뚝 기초의 최적화 설계가 이루어질 수 있을 것이다. Current design method on pile foundation in Korea depend highly on the estimated design method without performing the pile load test, which means most pile foundation have been designed as end-bearing capacity pile only. Due to the neglect of side shear friction capacity of pile that should be large enough to support the superstructure, the highly uneconomical and estimated design has been conducted. Thus the behavior study of axial load transfer for long piles has not been considered. In this study, several research examples with different types of soil in domestic and out of country were selected to analyze the axial load transfer, with comparison between measured results in field and estimated results by the calculated from the program APILEPLUS. The friction ratio from pile load test showed more than 80% in cohesive soils and about 70% in cohesionless soils, while from the program APILEPLUS more than 95% in cohesive soils. Even though the tip of pile penetrated into a relative hard layer, except being installed in a cohesionless soil, mostly a side friction resistance supported the pile. In case of being installed in a cohesionless soil, the friction ration was more than 20%. Therefore, the proper and economical design procedure that shall utilize both end hearing and side friction resistance should be conducted.

현장타설말뚝 건전도 시혐의 평가기준에 관한 연구

김명학;안종현 인제대학교 2012 仁濟論叢 Vol.27 No.1

Tests of field concrete piles for Sonic Test domestic and foreign research data through the principles and background theory, and comparative analysis of the limitations of test methods and test methods appropriate to national circumstances in the construction and evaluation criteria used in the proposed regulations and the test sound explore the different types of tube compression and tensile strength tests halryeol availability through testing, analysis, construction economics and applied field was analyzed and suggested. It is able to accurately predict that CrossholeSonic Logging Test inspection of the various methods of pile Drilled shaft field of Sonic Test and relatively easy assay. However, calculated from the results that pile with my Sonic Logging Test delivery rate is difficult to assess the integrity of piles. According to several study, more reasonable inspection standards currently being applied to improve the Sonic Test on-site Drilled shaft of stakes to secure the level of design will be need to make. As other studies, KS Secretary of metals other than White Pipe and BS White Pipe PE pipe, PVC pipe, ABS pipe, compression strength test and tensile test results for a fixed piping to replace the tube in the most appropriate management of the ABS's projections, compared to Rigid adhesion to glass 1/ 3 the price and weight, smaller castle construction facilitates usability in the economy and the inspection pipes were analyzed to replace metallic conduit.

한 대학 신입생의 우울수준과 관련변인에 관한 연구

이명학,남해성,손석준,이정애,김병우 대한보건협회 1994 대한보건연구 Vol.20 No.2

1994년도 한 대학 1년생을 대상으로 8개항목의 생활만족지수(LSI-W) 그리고 20개항목의 우울지수(CES-D) 및 관련변인들을 조사하여 각각의 점수와 우울증의 유병률을 계산하고 서로간의 관련성을 조사하여 다음과 같은 결과를 얻었다. 1. 생활만족지수의 평균점수는 9.98이었고 비흡연군, 비음주군, 운동을 하는 군에서 평균점수가 유의하게 높았다(p<0.01). 2. 우울지수의 평균점수는 17.2였고 여학생에서 남학생보다 유의하게 높았고, 우울증의 유병률은 19.8%이었고 여학생에서 남학생보다 유의하게 높았다(p<0.01). 3. 우울증세 고위험군과 저위험군에 있어서 건강에 대한 본인의 생각과 본인이 인지하는 체중에서 차이가 있었으며, 생활만족지수, 가족수, 체중, 신장에서 유의한 차이를 보였다(p<0.05). 4. 우울지수와 생활만족지수, 연령, 종교활동기간, 신장, 체중등과는 음의 상관을 나타내고(p<0.01), 가족수, 수면시간, 경제수준과는 양의 상관을 보였다(p<0.01). 5. CES-D에 영향을 미치는 변수를 알아보기 위한 단계적 로지스틱 회귀분석에서 생활만족도, 성별, 건강에 대한 본인의 생각, 본인이 인지하는 체중, 흡연, 음주가 CES-D에 의한 우울증 발현에 있어서의 유의한 요인으로 나타났다(p<0.05). The questionnaire survey using the Center for Epidemiological Studies-Depression Scale(CES-D) and 8-items Life Satisfaction Index Well-being(LSI-W) and other variables was conducted to determine the prevalence of depression and to identify the correlation among CES-D and related factors. Study population was the whole freshman group newly enrolled in a university. The results were as follows; 1. Mean score of LSI-W was 9.98 and that score was higher in non-smokers, non-drinkers and exercise group (p<0.01). 2. Mean score of CES-D was 17.2 and the prevalence of depression was 19.8%. And those were significantly higher in female than in male(p<0.01). 3. Perceived health status, perceived weight, LSI-W, family size, weight and height were significant variables between high and low risk group of depression(p<0.05). 4. CES-D score was negatively correlated with LSI-W, age, duration of religious life, height, weight and po-sitively correlated with family size, sleeping time and economic status(p<0.01). 5. In the regression analysis significant predictors of the depression were sex, preceived health status, weight, smoking and drinking(p<0.05).

2-Vinylpyridine과 Methylmethacrylate의 Anion共重合

李學沂,金祐埴,鄭明秀 慶北大學校 1975 論文集 Vol.20 No.-

2-Vinylpyridine and methylmethacrylate were copolymerized with n-butyllithium as an initiator in n-hexane at o˚ to determine the reactivity ratio of this monomer system. r_1=0.041(2-vinylpyridine) r_2=1.14 (methylmethacrylate) From the reactivity ratio and Q-e value, it was known that the copolymerization of this monomer system is anionic and controlled by the polar effect of the monomer.

Gitelman씨 증후군 1예

차영학,송명준,신요식,김성민,김영욱,김윤권,김소연,김영중,조민구,이권전 全南大醫大 2001 전남의대학술지 Vol.37 No.3

양방향 재하시험을 통한 선단지지층에 따른 선단지지력 산정

김명학;우화영 인제대학교 2012 仁濟論叢 Vol.27 No.1

The drilled shaft in the domestic construction sites are usually installed in soft rock or weathered rock layer. The formula of bearing capacity of the drilled shafst were adapted from foreign codes, which are not suitable in domestic subsurface condition. The most of formular of the end bearing capacity of drilled shafts are using uniaxial compressive strength of rock cores, which are hard to obtain in most of domestic weathered rock layer. In this study, several domestic area of bi-directional loading tests were analyzed. And the correlation of SPT N value and unit end resistance were analyzed. Also, appropriate design unit end resistance of domestic weathered/soft rock layer is suggested according to SPT N values.

국제포트폴리오의 모형의 전략적 유용성과 그 한계

김명학 尙志大學校 1998 論文集 Vol.19 No.-

大都市 地下空間 開發과 活用에 關한 硏究

李啓鶴,梁明植 호남대학교산업기술연구소 1994 산업기술연구논문집 Vol.1 No.-

오늘날 우리나라 大都市는 都市化에 따른 都市로의 人口集中으로 도시의 限定된 空間에서 平面的인 擴散만을 거듭할 수 없을 것이며, 이에 대한 對策으로 都市의 地下空間의 활용이 절실히 요청된다. 未來都市에 비하면 立體的인 都市構造를 고려한 地下空間의 利用計劃은 물론, 交通計劃도 地上, 地中, 地下空間으로 하나의 體系속에서 다루어져야 한다. 本 硏究에서는 外國의 地下空間活用 實例와 우리나라 地下空間의 활용 상황을 살펴보고 앞으로 닥쳐올 地下空間時代를 대비하는 뜻에서 우리나라 地下空間 建設開發에 따른 問題點과 大都市의 地下空間開發 可能性 등을 검토하였다. Today in according as our country metropolies have beed civilized, it causes overpopulation. With the result, its plane level development meets the limitation of open space. It urgently needs to use underground space to solve this problem. The planning of underground space utilization is considered three dimensional city construction for future city and traffic plan are should be dealt with ground, in the ground and underground in the one system. This study is researched as to the examples of foreign countries planning of underground utilization. It is investigated our metropolies of underground space utilization's possiblility and the problems as a result of underground space construction development in preparing for underground era.

建設産業의 技術競爭力 提高를 위한 共同技術開發方案에 관한 硏究

李啓鶴,崔明奎 호남대학교 산업기술연구소 1997 산업기술연구논문집 Vol.5 No.-

건설시장의 개방과 함께 급변하는 기술환경의 변화는 우리가 필요로 하는 기술로의 접근을 어렵게 하고 있어 기술개발을 위한 관련 분야간에 상호 협력적인 연구개발이 필요하게 되었으며, 정부에서도 적극적인 기술협력을 통해 산업기술을 확보하는 전략을 추진하고 있다. 이에 따라 본 연구에서는 건설산업의 기술경쟁력 제고를 위해 국내 건설산업과 기술개발수준, 산ㆍ학간 공동기술개발에 관한 이론적 고찰과 함계 이에 대한 실태분석을 통해 공동기술개발의 내부 메커니즘을 파악하는 동시에 보다 실효성 있는 방안을 제시하였다. This study aims to propose the betterment ideas for cooperative research and technology development, simultaneously with grasping the mechanism of it. To achieve those aims. We attempted to define the meaning of cooperative research and technology development, and to survey and analyze the current condition and problem of cooperative research and development activities between industry-university relation in small and medium construction industries, and to formulate effective policy tools for the promotion of cooperative research and development activity.

흉·요추 불안정성 척추 손상 환자에서 전방감압술과 KANEDA Ⅱ와 SURGICAL TITANIUM MESH를 이용한 내고정술에 대한 임상적 고찰

이학준,김용현,이승명 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.6

The following is a retrospective study on the results of anterior spinal surgery with Kaneda Ⅱ instrumentation and Surgical Titanium MESH after thoracolumbar unstable spinal injuries. From July 1994 to June 1995, we operated on 14 patients at the Chosun University Kwang Yang hospital. Fourteen patients were followed for at least three months. Anterior spinal surgery was performed on the patients who had thoracolumbar unstable spine injuries. The procedure consisted of anterior decompression through corpectomy and stabilization with Kaneda Ⅱ instrumentation and Surgical Titanium MESH which was impacked with resected bone chip. Most of patients had demonstrated showed neurological improvement, relief of pain, immediate stabilization and early return to normal activities. Radiologic evaluation showed the correction of the fracture deformity with satisfactory outcome postoperatively.