건설현장에서 외국인 노동자의 생산성에 관한 연구-생산성 및 생산성 저해인자 평가를 중심으로-

최희복,신윤석,강경인 한국건축시공학회 2005 한국건축시공학회지 Vol.5 No.1

The Korean society faces a new issue of accepting foreign workers. Foreign labors in construction industry reached about 400,000 recently. Thus they have become one of the essential resources to fill up insufficient labor supplies in construction industry. And it is important how to manage foreign labors efficiently. However there are few studies focused on this subject. Purpose of this study is to research productivity of foreign labors in the domestic construction site. So investigate the value of foreign labors. Also this study forecast elements effect on foreign labors productivity in the construction industry. And research what element is more important to improve productivity and what element is more difficult to manage. In the result, this study is expected to prospect effective method of foreign labor's management in the domestic construction industry, so contribute to utilize foreign labors more efficiently.

중소규모 건설회사 CAD 활용현황과 대학교육 방안

최희복,장명훈 한국건축시공학회 2016 한국건축시공학회지 Vol.16 No.2

A survey of small-size contractors in Jeju was conducted to investigate college graduate's CAD (computer aideddesign) competence. Most of small-size contractors use CAD softwares to review and update drawings submitted froman architect. This research analyzed the curriculum of the architectural engineering in several national universities. TheCAD classes have 4 or 6 hours per week and use AutoCAD primarily. This research proposes that a CAD class needsat least 6 hours per week, 2D drawing is the main theme in the curriculum, and exercises to make 3D models are alsoincluded in the CAD class. The improved methods, Internet cafe and real time feedbacks using a smartphone, toevaluate the reports and exercise results are necessary. 건축공학을 전공한 학생들이 보유해야할 CAD 활용능력을 조사하기 위해 제주지역 중소규모 건설회사를 대상으로 설문을 실시하였다. 소규모 건설회사는 CAD 소프트웨어를 사용하여 기존 도면을 수정하고 있다. 또한 지방의국립대학의 CAD 수업현황을 분석하였다. 기존의 CAD 수업은 4시간 또는 6시간으로 진행하고 있으며 AutoCAD를175주로 사용하고 있다. CAD 수업은 6시간 실습이 필요하다고 판단되며 2D 도면 작성이 주요 실습내용이 되어야 하고 3D 모델 작성도 수업에 편성되어야 한다. 수업의 결과를 평가할 수 있는 방법의 개선도 필요하며, 인터넷을 활용하거나 스마트폰을 이용한 실시간 피드백을 대안이 될수 있다.

순환골재 내부의 미세균열 발생형태 및 흡수 특성

최희복,김백중,강경인,이종구,Choi, Hee-Bok,Kim, Beak-Joong,Kang, Kyung-In,Yi, Chong-Ku 대한건축학회 2011 대한건축학회논문집 Vol.27 No.3

Many researchers have reported strength reduction of concrete when recycled aggregate is introduced to the mix. However, the causes of such reduction and preventive measures are yet to be established. In this study, effect of recycled aggregate on concrete is investigated by microscopic examinations of micro-cracks present in the recycled aggregate (RG) and by measuring moisture absorption rate of RG. The results showed the followings: 1) the shape and extent of micro-cracks vary by type and size of RG, 2) recycled aggregate concrete (RAC) containing RG formed the failure surface along the micro-cracks inside RG, 3) moisture uptake, which may alter local water content in wet concrete, mostly took place via micro-cracks of RG reaching depth of about 3 mm within the first 1 hr, much faster rate than that of natural aggregate of the same type. Based on the results of this study, it is recommended that the size of RG be kept less than 10 mm for production of high quality RG with a small amount of micro-cracks.

순환골재콘크리트의 공학적 특성 및 내구성

최희복,신윤석,안성훈,정헌수,강경인 대한건축학회 2007 大韓建築學會論文集 : 構造系 Vol.23 No.9

A part of research about durability and a research of basic about RAC had been gone. Therefore, for application to structure of RAs substantially, we grasp special quality of freezing-thawing resistivity, the stress - strain relation, shear stress - shear strain and drying shrinkage that influence directly in durability of concrete structure. The result is as following. 1) The effect of the quality and the replacement ratio of RAs that get in stress-strain curve of a RAC are very small. 2) The shear stress-strain relation of a RAC receives big effect by the grade and replacement ratio of RAs. 3) The relative dynamic elasticity modulus of RAC by increase of freezing-thawing cycle number rises as the replacement ratio of RAs increases. 4) The freezing-thawing resistance of RAC receives bigger effect by proper interior air content and concrete moisture content than the replacement ratio of RAs. 5) The weight change ratio by freezing-thawing cycle is high as the replacement ratio of RAs increases. Specially, weight decrement by freezing-thawing is very high in used the RG than RS.

Surgical Correction of Medial Patellar Luxation including Release of Vastus Medialis without Trochleoplasty in Small Breed Dogs: A Retrospective Review of 22 Cases

최희복,김상연,한창훈,장아람,정혜진,황태성,이희천,황용현,이원재,이성림,이재훈 한국임상수의학회 2018 한국임상수의학회지 Vol.35 No.3

In 22 dogs with medial patellar luxation (MPL) of grade 3 or lower, resection of the vastus medialis obliquemuscle, patellar anti-rotational suture, fascia lata overlap, and tibial tuberosity transposition (TTT) were undertakento stabilize the patella without trochleoplasty. Data including signalment, clinical symptoms, details of the affectedhindlimb, preoperative and postoperative patellar luxation grades, postoperative recovery time, and postoperativecomplications were obtained from medical records. The grade of lameness was evaluated preoperatively andpostoperatively. Mean (± SEM) grade of medial patellar luxation was 2.64 ± 0.11 preoperatively and 0.2 ± 0.27postoperatively. Mean (± SEM) grade of lameness was 1.73 ± 0.27 preoperatively and 0.18 ± 0.15 postoperatively. Patellar reluxation occurred in 1 of 22 (4.5%) cases requiring additional surgery. At final follow-up, 2 of the 22 (9.0%)dogs, including one with reluxation, had occasional lameness. Client-based questionnaire results demonstrated significantimprovements in all parameters. Surgical treatment of MPL that included resection of the vastus medialis oblique withoutfemoral trochlear groove deepening improved surgical outcomes in dogs with up to grade 3 MPL.

현무암 석분슬러지를 재활용한 마감용 드라이몰탈의 기능성 평가

최희복,이동욱,고동우 대한건축학회지회연합회 2021 대한건축학회연합논문집 Vol.23 No.2

As basalt is used widely in construction area as architectural materials, the amount of basalts sludge is increasing rapidly. Basalt sludge is being treated with an industrial waste, so an economical and environmental problems occurs. The suitable mixture ratio to manufacture the dry mortar which changed the part of the fine aggregate to a basalt sludge in a cement mortar was derived. Physical performance, anion radiometric quantity, far-infrared radiation radiometric quantity and heatconductivity were measured and the performance as the functional finishing material was estimated. Based on the results of previous studies, the mixing ratio of basalt stone powder sludge was further subdivided from 0 to 20%, and the mixing ratio was applied in units of 10% for basalt stone powder sludge replacement rate of 20% or more. The replacement rate of basaltic stone sludge was changed to 0%, 3%, 6%, 9%, 12%, 15%, 21%, 30%, and 40%, and the changes of far-infrared emission energy, anion emission and thermal conductivity were analyzed. The result is that 1) the far-infrared emissivity of mortar using basalt stone sludge showed 0.933 higher than existing mortar. This result shows far-infrared emissivity better than other functional finishes. 2) The anion radiation did not show a consistent trend according to the replacement rate of basal rock powder, but showed an increase of 5% to 12% compared to general cement mortar. 3) If the basalt stone sludge was replaced by approximately 21%, the physical properties were increased compared with the general cement mortar, and the far-infrared emissivity and anion radiation as functional mortar were improved.

TPO 시트재와 유도가열공법을 적용한 고내풍성 지붕마감 공법

최희복,신윤석,최진철,이보형,강경인 한국건축시공학회 2009 한국건축시공학회지 Vol.9 No.1

Strong winds according to global warming cause the increase of the frequency and the repair cost of damaged roofs. In the United States, Factory Mutual Insurance Company(FMIC) promotes the roofing design that resists heavy wind-load, as the means of strict criteria. This fact reveals that more durable roofing system will be also required in Korea. Therefore, this study aims at developing such a system with high wind-resistance performance using Thermoplastic polyolefin(TPO) and Electromagnetic induction technology(EIT) than the previous systems. The system presented in this study consists of 4 main devices as follow; 1) a disc to fix sheets for TPO & EIT method, which can conduct structural design according to site condition, such as region, building height, and wind load. 2) a nail to have about 30% stronger lifting-up capacity than that of the previous nail. 3) a disc to fix sheets, which has triangle protuberance not to damage sheets in the repeatable wind load, and 4) a electromagnetic induction device to combine a disc and a sheet by heating uniformly and quickly adhesive agent on the disc. The results of mock-up test illustrate that the system provides wind-resistant performance to achieve satisfactorily the structural design criteria of FMIC. In addition, the system is faster, chipper, and easier than the existing system, and is expected that this roofing system can be applied to the rehabilitations of an existing as well as a new building.

아동의 만다라 미술치료 효과에 대한 메타분석

최희복,박성현 한국예술치료학회 2014 한국예술치료학회지 Vol.14 No.1

본 연구는 2003년부터 2011년까지 국내에서 일반 아동을 대상으로 실시한 만다라미술 치료의 효과성을 검증한 논문을 메타분석(meta-analysis)하였다. 연구 결과를 요약하면 다음과 같다. 총 15편의 연구대상 논문들에서 산출된 99개의 평균 효과 크기는 .226으 로 통계적으로 유의한 효과크기였다. 정서변인(주의집중, 자아존중감)의 효과크기는 .54로 중간 이상의 효과크기를 보였다. 추가적인 분석에서 자아존중의 효과크기가 .52 로 주의집중의 효과크기 .44보다 높았다. 자아존중의 하위 변인별 크기순으로 보면 학 교 관련 자아존중감, 사회관련 자아존중감, 일반관련 자아존중감, 가정관련 자아존중 감 순으로 나타났다. 반면에 행동변인에 포함된 공격성, 폭행, 과잉행동, 충동성 등의 경우 효과의 크기가 r=-.56으로 유의미 하지 않게 나타났다. 학년별 변인에서는 저학년(1∼3학년)의 효과크 기는 r=.16이며 고학년(4∼6학년)의 효과크기는 r=.29로 저학년의 만다라 프로그램의 효과는 고학년에 비해 상대적으로 효과가 적었다. 회기수별 효과크기는 20회 미만의 프로그램 진행보다는 20회이상 실시한 경우에 그 효과의 크기가 더 컷다. 회기당 시 간별 효과크기로는 회기당 60분미만의 경우 효과크기는 r=.42였고, 회기당 60분 이상 의 경우 효과크기는 r=.21로 60분미만의 경우보다 효과크기가 작았다. 본 연구는 아동 의 만다라 미술치료 프로그램의 효과연구 결과를 종합하고, 프로그램 개발 및 효과적 인 운영에 필요한 정보를 제공하였다는데 의의가 있다. The purpose of this study is analyze the results of previous studies and to make an integrated conclusion by performing meta-analysis about theses testing the effect of mandala art therapy. The research results are as follows. First of all, the mean effect size calculated in the total 15 of subject theses is .226 and it was significant. According to interpretative criterion of the effect size purposed by Cohen(1988), the grand mean effect size of mandala art therapy showed the effect size below median. Next, the conclusion about the mean effect size by dependent variables of mandala art therapy in children is as follows. The effect size of emotional variables (attention, self-esteem) was .54 and showed the effect size below median. In the additional analysis, the effect size of self-esteem was .52 and was higher than .44, the effect size of attention. The size-order by sub-variables of self-esteem was shown to be school-related self-esteem, society-related self-esteem, general self-esteem, and household-related self-esteem. On the other hand, in the case of behavioral variables including aggression, assault, hyperactivity, and impulsiveness, the effect size was r=-.56 and insignificant. Lastly, as treatment characteristic variables, the effect sizes grade level, the number of treatment, and duration time per treatment were analyzed. As for the grade level variable, the effect size of the lower grades (first∼third grade) was r=.16 and the effect size of the upper grades (fourth∼sixth grade) was r=.29, and so the effect of mandala program for the lower grades was relatively small, compared with the upper grades. In the effect sizes by the number of treatment, program performance more than 20 times was more effective than the performance less than 20 times. In the case of the effect sizes by duration time per treatment, the analysis was conducted as the treatment less than 60 minutes and more than 60 minutes and the effect size of the treatment less than 60 minutes was r=.42 and the effect size of the treatment more than 60 minutes was r=.21 and it was smaller than the effect size of the treatment less than 60 minutes. In other words, children’s mandala art therapy program was more effective in less than 60 minutes per treatment. This study is significant in the sense that it put together the research results on the effects of children’s mandala art therapy program and provided information for the program development and effective operation.

순환골재콘크리트와 이형철근 사이의 부착성능

최희복,강경인 大韓建築學會 2008 大韓建築學會論文集 : 構造系 Vol. No.

This research is main object to study bond performance between concrete and rebar by the replacing ratio of recycled aggregate and the quality of recycled aggregate etc. as main experiment factor. Result is as following. 1) Slip was small or similar than normal concrete to replacing ratio 50% of recycled aggregate, increased in concrete that replacing ratio 100% of recycled aggregate. 2) Bond strength of recycled coarse aggregate concrete was similar with normal concrete, but bond strength of recycled fine aggregate concrete decreased according as recycled aggregate replacing ratio increases. 3) The <TEX>$\sqrt[{\tau}b]/{fck}$</TEX> of recycled aggregate concrete decreased according as relative absorption increases, and decrease tilt of <TEX>$\sqrt[{\tau}b]/{fck}$</TEX> is obvious in more than relative absorption 3. 4) According as water-cement ratio is decrescent, the <TEX>$\sqrt[{\tau}b]/{fck}$</TEX> of recycled aggregate concrete decreased, and specially it was notable in recycled fine aggregate concrete.

단면증대 철근콘크리트 보의 휨성능평가

최희복,고동우 한국복합신소재구조학회 2018 복합신소재구조학회논문집 Vol.9 No.3

단면증대공법은 경제성과 시공상 보편적으로 사용되는 공법으로 우리나라의 철근콘크리트 기둥을 보강하기 위한 공법으로 널리 사용되어 왔다. 이와 관련하여 단면증대된 부재의 성능에 관한 실험적 또는 해석적 연구는 수행된 사례가 있으나, 휨성능과 단면증대 부분의 표면거칠기 범위의 상관관계에 대한 연구는 수행되지 않았다. 따라서, 본 연구에서는 단면증대된 보의 휨성능을 평가하기 위해 표면거칠기의 범위를 변수로 한 단면증대보의 휨실험을 수행하였다. 그 결과는 다음과 같다. (1) 시공에서 사용되는 방법에 따라 거칠기 처리가 된 표면의 거칠기 이력을 분석한 결과 인접 산과 골의 차이는 6mm를 초과하였다. (2) 거칠기 이력이 측정된 거리가 600mm를 초과하연, 거칠기 지표는 일관된 결과를 나타내었다. (3) 표면거칠기처리를 하지 않은 보의 휨성능과 비교할 때, 표면거칠기가 된 보의 휨강성은 25%증가하고, 항복강도는 9%, 최대강도는 6%증가하였다. (4) 모든 시험편은 표면거칠기 처리의 유무에 상관없이 단면해석결과 나타난 항복강도보다 높은 강도를 나타내었다. Because of the economy and construction simplicity, Jacketing method has been widely used in strengthening RC columns in Korea. Although some studies on the performance of jacketed elements have been conducted by experimental or analytical methods, the correlation between the flexural performance and the range of the surface roughness of the jacketed element has not been performed. Flexural tests were performed to evaluate the flexural capacity of jacjeted beams. The valuable of this study is the range of surface roughness. The test results are as follows; (1) Depending on the method currently used in practice, the depth of the siphoned surface has exceeded the 6 mm shown in most drawings, (2) A stable roughness index value was obtained when the measured distance of the roughness history was more than 600 mm, (3) Compared to beams with no surface roughness, stiffness of full surface roughness treated beam increased by 25 %, yield strength of that increased by 9 %, and maximum strength increased by 6 %, (4) All specimen showed greater yield strength than the yield strength as a result of the cross section analysis, regardless of whether surface roughness was treated or not.