• 국제학술발표논문집
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• The 1th International Conference on Construction Engineering and Project Management
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• pp.389-396
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• 2005

Despite very good reputation that Korean construction industrial firms had enjoyed until early 1990's in overseas markets, their participation abroad drastically declined after the delivery of two(2) million unit-housing project in the early 1990's and the foreign currency crisis that took place in the late 1990's. The revival of booming construction industry in domestic market is far beyond the expectation due to the long recession of the construction economy and government's severe restriction against real estate development. Under such crucial circumstances, the construction industrial firms' strategy to survive is the more active business promotion in overseas markets. However, the Korean construction industrial firms have to abandon the labor intensive strategy, through that they have enjoyed until the early 1990's, and turn to management oriented strategy which may be a new prosperous horizon and a new challenge as well, because the labor cost of newly developing countries is much more competitive. The aim of this study is to suggest how to cope with current market situations through a chronological survey based on the cost data prevailed during four decades from the 1960's until the 1990's in overseas markets.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2023년도 봄 학술논문 발표대회
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• pp.359-360
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• 2023

As data management and analysis technology advances, there is active discussion on how to utilize data generated in construction projects. Among them, the materials produced during the supervision work are highly useful because their generation cycle and format are regulated according to relevant laws. In this study, we analyzed whether the data produced during the supervision work in the construction phase of apartment housing can be utilized for project performance management. First, this study identified key data necessary for performance management through FGI with experts in the field of apartment housing. Next, we collected supervisory data from the case project and identified whether the data was generated, its cycle, and storage format. As a result of the analysis, the supervisory data contained various information that could measure the performance of construction projects and had the advantage of standardized data. In the future, utilizing supervisory data is expected to enable effective performance management of apartment housing construction projects.

• Journal of Preventive Medicine and Public Health
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• 제47권1호
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• pp.47-56
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• 2014

Objectives: The purpose of this study was to investigate the current status of and problems with the Safe Community Programs in Gangbuk-gu, one of the 25 districts of the capital city of Korea. Methods: The study subjects were 396 individuals who were involved in Safe Community Programs between 2009 and 2011. We examined the effectiveness and willingness of respondents to participate as a safety leader of the Safe Community Program with a questionnaire. We examined the injury death rates of Gangbuk-gu by using of the death certificate data of Korea's National Statistical Office. Descriptive statistics and chi-squared tests were used. Results: The effectiveness of programs did not differ but active participation differed significantly among subjects (p<0.05). The injury death rate of Gangbuk-gu as a whole increased during the implementation period. However, senior safety, in particular, may be a helpful program for reducing injuries in Gangbuk-gu. Conclusions: This study suggests that the lack of active participation may be a major problem of Safe Community Programs in Gangbuk-gu. Therefore, Safe Community Programs should be expanded to the entire district of Gangbuk-gu and more active participation programs should be developed.

• Journal of Biosystems Engineering
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• 제39권4호
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• pp.377-388
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• 2014

Purpose: Determining the spatial structure of data is important in understanding within-field variability for site-specific crop management. An understanding of the spatial structures present in the data may help illuminate interrelationships that are important in subsequent explanatory analyses, especially when site variables are correlated or are a combined response to multiple causative factors. Methods: In this study, correlation, principal component analysis, and single and nested variogram models were applied to soil electrical conductivity and chemical property data of two fields in central Missouri, USA. Results: Some variables that were highly correlated, or were strongly expressed in the same principal component, exhibited similar spatial ranges when fitted with a single variogram model. However, single variogram results were dependent on the active lag distance used, with short distances (30 m) required to fit short-range variability. Longer active lag distances only revealed long-range spatial components. Nested models generally yielded a better fit than single models for sensor-based conductivity data, where multiple scales of spatial structure were apparent. Gaussian-spherical nested models fit well to the data at both short (30 m) and long (300 m) active lag distances, generally capturing both short-range and long-range spatial components. As soil conductivity relates strongly to profile texture, we hypothesize that the short-range components may relate to the scale of erosion processes, while the long-range components are indicative of the scale of landscape morphology. Conclusion: In this study, we investigated the effect of changing active lag distance on the calculation of the range parameter. Future work investigating scale effects on other variogram parameters, including nugget and sill variances, may lead to better model selection and interpretation. Once this is achieved, separation of nested spatial components by factorial kriging may help to better define the correlations existing between spatial datasets.

• 한국산학기술학회논문지
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• 제19권7호
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• pp.16-23
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• 2018

카오스는 비선형 과학 분야에서 매우 중요한 주제 중의 하나이며, Lorenz가 처음으로 소개한 이후 집중적으로 연구되어지고 있다. 카오스 시스템의 한 특성은 카오스 시스템에 의해 생성된 신호는 다른 어떤 시스템과 동기화되지 않는다는 것이다. 따라서 두 카오스 시스템은 서로 동기화되는 것이 불가능한 것처럼 보이지만, 만약 두 시스템이 적절한 방법으로 정보를 교환한다면 이 두 시스템은 동기화가 가능하다. 본 논문에서는 능동 제어와 슬라이딩 모드 제어, 그리고 리아프노프 안정도 이론을 기반으로 하는 변형된 Lorenz 카오스 시스템의 동기화 문제에 대해 다룬다. 동기화를 위해 고려한 기법은 선형상태 오차 변수에 의해 짝을 이룬 구동시스템과 응답시스템으로 구성된다. 이를 위해 우선 대상 카오스 시스템에 대해 간단히 살펴본다. 다음으로 능동제어, 슬라이딩 모드 제어 기법을 이용한 카오스 시스템의 동기화와 채터링 문제를 해결하기 위한 제어 방법을 도출한다. 전체 폐루프 시스템의 점근적 안정도는 리아프노프 안정도 이론에 의해 증명한다. 컴퓨터 시뮬레이션은 제안한 방법의 타당성을 확인하기 위해 그래픽으로 제시한다.

• 한국해양환경ㆍ에너지학회지
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• 제15권3호
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• pp.219-226
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• 2012

국제해사기구(IMO)는 선박평형수를 통한 수중생물의 이동을 막기 위해, 2004년 선박 평형수와 침전물 통제 및 관리를 위한 국제협약을 채택하였다. 34개 선박평형수 처리장치가 IMO 활성물질 승인을 받았고, 이 가운데 20개 처리장치가 최종승인을 받았다. 본 논문에서는 IMO 활성물질 승인을 받은 처리장치에 대한 작용 원리와 총잔류산화제(TRO) 농도를 고찰하였다. TRO 최대 허용 배출 농도는 중화장치를 통해 낮추어 대부분 0.2 ppm 이하의 농도를 보였으나, 최대 처리 허용 농도는 장치별로 1-15 ppm으로 큰 차이를 나타내었다. 처리장치 별로 TRO 처리 허용 농도의 차이는 처리장치의 특성 및 필터의 유무와 종류 등과의 연관성 보다는 생물 사멸시험 시 생물종 특성과 수온, 탁도 등 수질 특성에 기인하는 바가 크다고 판단된다.

• 디지털융복합연구
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• 제15권10호
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• pp.419-428
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• 2017

본 연구의 목적은 영어 읽기수업에서 스마트폰과 페이스북 활용이 학생들의 능동적인 수업참여를 유도하는지와 이러한 수업을 설계할 때 고려할 점은 무엇인지 파악하는 것이다. Practical English listening and reading 과목에서 학생들은 수업활동을 수행하기 위하여 스마트폰을 사용하였고 수업활동의 결과를 페이스북에 게시하여 다 함께 보면서 강의를 들었다. 스마트폰은 주로 인터넷을 검색하는 용도로 활용되었고 페이스북은 수업을 LMS 역할을 하였다. 학기 초 사전설문은 수업활동 과제를 설계하는데 이용되었고 학기말에 사후설문과 학생들의 인터뷰를 통해서 수업방식에 대한 학생들의 의견을 수렴하였다. 연구결과 본 ICT 활용 수업방식은 학생들의 능동적인 수업 참여를 유도하였음을 알 수 있었다. 고려할 점은 수업활동 범위 좁히기, 여유 있는 수업 진행, 수업활동의 절차 및 의의에 대한 충분한 설명, 교내 LMS 사용을 고려, 사이버 한눈팔기에 대한 대책 마련으로 나타났다.

• 한국전문물리치료학회지
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• 제25권1호
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• pp.47-52
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• 2018

Background: A limited hip rotational range of motion (ROM) has been considered to be one of characteristics of low back pain (LBP) in athletes. Although LBP frequently occurs in jiu-jitsu athletes, no previous has compared hip rotational ROM between jiu-jitsu athletes with and without LBP. Objects: The aim of the study was to compare ROM for hip internal rotation (IR) and external rotation (ER), and total hip rotation between jiu-jitsu athletes with and without LBP. Methods: Jiu-jitsu athletes were recruited for the LBP group ($n_1=15$) and control group without LBP ($n_2=15$). IR, ER, and total rotational range of hip joint were measured using a goniometer. Analysis of variance was used to compare the ROM between groups and sides. Results: The LBP group showed a significantly lower range of passive hip IR, passive total rotation, active IR, active ER, and active total rotation than the control group (p<.05). Dominant side of passive hip IR and active IR had a significantly lower ROM than non-dominant side (p<.05). In passive ER ROM, non-dominant side was significantly greater than dominant side (p<.05). Conclusion: Compared to jiu-jitsu athletes without LBP, athletes with LBP exhibit a loss of hip rotational ROM. Based on these results, clinicians and athletic trainers should measure hip rotational ROM when designing the management plan for jiu-jitsu athletes with LBP.

• 대한물리치료과학회지
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• 제10권1호
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• pp.30-37
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• 2003

Purpose : The purpose of this study is giving the healthy promotion and it's related data base for out-patients who had stroke via evaluating the general characters of their active daily living and physical therapy Method : This study researched 81 patients who had received physical therapy service in 6 general hospitals located Pusan city responded to the self-assessment questionnaires from July 2002 to August 2002. Conclusion : In this study, patients were composed of 61.7% of male, 65.4% of 50's-60's in the age, 56.8% of cerebral infarction, and 60.5% of right hemiplegia. 74.1% of patients received physical therapy after 6 months from an attack, only 62.9% used orthosis & gait aids, and 59.2% received medical care 2 or 3 times per week. 40.7% of patients had over 9 hours sleeping time and 22% had reduced $1{\sim}2hours$ before hospitalization. 90% did not have drinking and smoking. 91.4% had 3 times eating per day, and 67.7% did not have good nutrition. The reasons of that were their eating habit, 542% of eating-giver, 3.7% of economic problem. 46.9% of patients used healthy food. In active daily living, patients can't do drinking by cup, voiding & defication by themselves, however patients can't do wearing/take off, etiquette for dressing, bathing, stepping by themselves. 40.7% of patients don't wear orthosis, 55.6% of patients don't use W/C. Part of physical therapy that patients concerned importantly exercise for prevention of joint distortion, management of affected side, and 80% of patients was also concerned other's part, significantly. 71.8% of patients & care-givers want to receive physical therapy at home, and 74% of patients do physical therapy by themselves at home along teached hospitalization.

• 가정과삶의질연구
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• 제24권3호
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• pp.73-82
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• 2006

The purpose of this study was to investigate the related variables of university students' coping behavior concerning job-searching problems. The subjects were 436 senior students (212 men and 224 women) enrolled in a university in Gyeongbuk Province. Survey questionnaires were used to measure undergraduate students' coping behavior concerning job-searching problems, work commitment, their will to accept downward employment, sex role identity, grade, sex, perceived SES, and major. Data were analyzed by means, standard deviations, t-test, one-way ANOVA, Scheffe' test, and regression. Results are summarized as follows: (1) Male students' level of active and supportive coping behavior was higher than female students'. Male students' level of evasive coping behavior was lower than female students'. Students who perceive their economic condition as negative were higher in active and supportive coping behavior and lower in evasive coping behavior than the students who perceive their economic condition as positive. (2) The students who were strong in work commitment were higher in active coping behavior, and lower in evasive coping behavior than those who were not. (3) The students who were willing to accept downward employment were higher in active coping behavior than those who were not.(4) The students' coping behavior concerning job-searching problems differed according to their sex role identity. (5) Work commitment and sex role identity were influential variables on university students' job-coping behavior.