• 한국경영과학회지
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• 제33권2호
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• pp.87-101
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• 2008

This paper considers an order scheduling model to minimize the total weighted tardiness of orders. Each order requires different types of products. Each type of product is manufactured on its dedicated machine specified in advance. The completion time of each order is represented by the time when all the products belonging to the order are completed. The objective of this paper is to find the optimal production schedule minimizing the total weighted tardiness of a finite number of orders. In the problem analysis, we first derive a powerful solution property to determine the sequence of two consecutive orders. Moreover, two lower bounds of objective are derived and tested along with the derived property within a branch-and-bound scheme. Two efficient heuristic algorithms are also developed. The overall performances of the proposed property, branch-and-bound and heuristic algorithms are evaluated through various numerical experiments.

• 국제학술발표논문집
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• The 9th International Conference on Construction Engineering and Project Management
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• pp.50-56
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• 2022

Change Orders generally impact cost and schedule performance of highway projects. However, highway projects that do not have any change orders also face cost growth and schedule delays. This study seeks to determine the cost and schedule performance of Texas DOT projects by collecting project data for 120 highway projects completed between 2016 to 2020. For the study, we selected project data that has zero or negative change orders which were then grouped and analyzed based on their Project Types i.e., maintenance works; structural works; restoration and rehabilitation works; and safety works. The study found that performance of Maintenance and Safety type projects had less cost and schedule growth among the data analyzed. Statistical tests also found that even though the projects have no change orders, Rehabilitation and Restoration type projects experienced significant schedule growth compared to others. However, the data did not show any significant cost and schedule growth for the projects when statistical tests were performed on overall data. The study concluded that highway projects are experiencing schedule growth even though the projects had no change orders. Results from the study can help planners, engineers, and administrators to gain better insight on how different types of highway projects are performing in terms of cost and schedule and eventually derive appropriate solutions to minimize cost and schedule growth in such projects.

• Environmental Engineering Research
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• 제19권4호
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• pp.317-329
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• 2014

The diversity of cyanobacteria in Sri Lanka was studied in different water reservoirs, paddy fields, brackish water and tsunami affected areas using light microcopy, 16S rRNA sequences, followed by phylogenetic analysis. Based on light microscopy, 24 genera were identified from environmental samples belonging to the orders Chroococcales, Oscillatoriales, Pleurocapsales and Nostocales. In cultures, 33 genera were identified from all five cyanobacterial orders, including Stigonematales. Based on 16S rRNA gene sequences and their morphology, two isolates were identified up to species level, 72 to genus level, one isolate up to family and 11 up to order level. Twelve isolates couldn't be assigned to any taxonomic level. The results of 16S rRNA gene sequences along with the phylogenetic analysis indicated that some cyanobacterial isolates could be accommodated to genus or order level. The 16S rRNA sequence analysis data in this study confirmed that order Nostocales and order Pleurocapsales cyanobacteria are monophyletic while orders Chroococcales, Oscillatoriales and Stigonematales cyanobacteria are polyphyletic. Polyphasic approach including the combination of light microscopy, cultures and the analysis of 16S rRNA gene sequences provide a promising approach to ascertain the diversity of cyanobacteria in different habitats.

• 대한토목학회논문집
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• 제34권5호
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• pp.1599-1608
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• 2014

본 연구는 대표적인 건설경기지표인 건설수주액의 변화가 전문건설업체의 경영성과지표에 미치는 영향을 분석하고 각 경영성과지표 사이에 관계를 파악하여 건설수주액의 변화에 따른 전문건설업체의 대응전략을 제시하기 위한 목적으로 수행되었다. 토목중심의 전문건설업체는 유동비율이 건설수주액에 큰 영향을 미치는 것으로 나타났으며, 건설수주액이 자기자본비율에 큰 영향을 주고 있어 건설수주액 자체가 기업의 안정성과 직결된다고 판단된다. 특히, 유동비율이 건설수주액에 관계가 있다는 것은 최근 시공능력평가에서 이에 대한 지표의 중요성이 강조되기 때문인 것으로 판단되며, 이에 대한 개선을 통해 수주활동을 개선할 수 있을 것으로 판단된다. 실제로 전문건설업체에서는 충분한 자산과 많은 매출액을 확보한 상태에서 부도가 나는 이른바 흑자부도가 발생하는데, 이는 기업이 단기적으로 채무에 대한 지급능력이 떨어지기 때문이며, 이러한 유동비율은 기업의 존폐가 직결된다 할 수 있다.

• 복식문화연구
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• 제3권2호
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• pp.323-346
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• 1995

The increasing number of senior citizens, combined with the power of purchasing due to discretionary income have vaulted the elderly into the position of an attractive future target market. Therefore, it would be crucial for marketers to understand elderly's purchasing behavior. The purpose of this study was to identify clothing purchasing behavior of elderly women. For this study, questionnaires were administered to 600 women over 55 years of age. However, the sample that was analyzed fer statistical analysis was involved 418 elderly women. Statistical analysis were majorly descriptives such as frequencies and percentages. The major results of this study were summarized as follows. 1. In relation to problem recognition in purchasing process, motives of purchasing apparel were identified as a happy event in home such as a wedding and a birthday, a change of seasons and a casual discovery of a suitable clothing in shopping, in orders. 2. In relation to information search, important information on apparel and fashionability were thought as display racks in a store, opinion from friends and family and fashionability from others or streets, in orders. 3. In relation to selecting a store in purchasing process, older consumers assessed that attractive price, design suited to my age, variety in one store and apparel product quality were important store attributes, in orders. In terms of a purchase place, older consumers purchased clothing mainly on department stores, wholesale stores such as Namdaemoon or Dongdaemoon market, mainly retail stores located close to home and discount stores of well known brand, in orders. 4. In relation to alternative evaluation in purchasing process, older consumeres considered that style or appearance suited to me, color, design, comfort and fitness were important selection criteria, in orders. 5. In relation to purchase choice, 61.7% of the respondents paid money by themselves and 68.9% paid on cash in purchasing apparel. 6. In relation to outcomes of purchase, older consumers solved their complaint against a unsatisfactory product mainly by returning the unsatisfactory clothing. Also, there were those who took no action against the unsatisfactory product and who altered the clothing for fitness by themselves.

• Journal of Forest and Environmental Science
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• 제27권3호
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• pp.169-181
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• 2011

The purpose of this study was to understand the geographical and environmental distribution of animals and plants in Baekdudaegan region using field survey and GIS data. Crucial factors were selected and analyzed to understand the distributional characteristics of wild animals (16 species in 5 orders) and rare endemic plants (20 species in 12 orders). These crucial factors include stand factor (forest type, DBH class, and crown density), soil factor (bed rock, soil texture, and organic matter), geographical factor (elevation, slope, aspect) and climatic factor (temperature, rain fall, humidity). Finally, ten crucial factors were selected by statistical analysis and categorized for analyzing geographical and environmental features. Three orders such as Rodentia, Carnivora, and Artiodactula in wild animal showed the similar habitat characteristics with the small diameter and the elevation range from 801 to 1,000m. The Hydropotes inermis of Artiodactyla and Rattus norvegicus of Rodentia were different in the type of orders, but they had the similar habitat characteristics with the coniferous forest and loam. On the other hand, four orders such as Tubiflorales, Liliales, Ericales, and Rhamnales in the rare and endemic plants were showed high occurrence rate in the organic matter between 4 and 6%. The Rodgersia podophylla of Rosales and Gastrodia elata Blume of Microspermae were different in the type of orders, but they had the similar habitat characteristics with the stand factor and soil factor.

• 국제학술발표논문집
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• The 6th International Conference on Construction Engineering and Project Management
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• pp.387-391
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• 2015

Currently, there is insufficient research on the construction management performance since the CM system was introduced in Korea. For successful completion of construction projects, active use of construction mangers on projects is necessary by introducing construction management to the projects. In view of this, this study analyzed the annual CM performance from 1996 to 2013 but for the past 5 years from 2009 to 2013, a detailed analysis was carried out. For different sectors, CM performances were divided into public and private sectors, for project types, construction, civil and others, for project phases, pre-design, design, construction and post-construction phases, for contract types, sole and joint contract types, for project scale, the amount of the projects was taken into consideration and they were divided into large, medium and small scales and for the types of projects, they were divided into, shops, department stores, shopping centers, hospitals, government buildings, hotels, accommodation facilities, factories, buildings for workshops, office buildings, stadiums, playgrounds, schools and other construction types and all the data divided into such categories was analyzed. The results in this study can be used as a basic reference for studies in analysing construction management performances.

• 한국콘텐츠학회논문지
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• 제18권6호
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• pp.144-154
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• 2018

최근 국내 건설시장이 활기를 잃어가는 바, 새로운 활로는 찾는 측면에서 공적개발원조(ODA)를 활용한 해외건설시장 진출에 대한 논의가 진행되고 있다. 본 연구를 통해 아시아 지역에 대한 ODA 실적과 해외건설수주의 상관관계를 벡터오차수정모형(VECM)을 통해 실증적으로 도출하고, ODA를 활용한 해외 건설사업 수주의 실효성을 밝혀내고자 하는 목적이 있다. 연구결과, ODA 금액과 해외건설수주의 영향 관계가 예상과는 달리 낮은 상관관계를 보였다. 이는 영리 목적의 건설사업과 공공복리 증진을 위한 ODA사업은 근본적 성격이 다르고, ODA지원시점과 해외건설수주 시점이 상이하기 때문인 것으로 보인다. 또한, 우리나라는 여타 선진국에 비교해 ODA공여 경험과 규모 면에서도 이들에 비해 월등히 적다. 마지막으로, 이들의 사업규모에 많은 차이가 있었다. 결과적으로, 기존의 연구와 달리 이들의 관계에 대해 통계적 자료에 기초한 실증적 연구를 시도했다는 점에 본 연구의 의의를 둔다. 향후 ODA경험의 축적, 시계열 데이터 보완 등을 통해 보다 면밀한 관계가 도출될 것으로 기대되고, 이는 이론적, 실무적 근거로 제공할 수 있을 것이다.

• 한국응급구조학회지
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• 제18권2호
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• pp.95-108
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• 2014

Purpose: This descriptive study examined awareness of and ethical attitudes associated with Do Not Resuscitate (DNR) orders in 119 emergency medical technicians (EMTs). Method: In total, 255 paramedics and basic EMTs completed questionnaires between March and May, 2013. Data were analyzed using the SPSS WIN 18.0 program. Results: A chi-square analysis revealed significantly different responses given by paramedics and basic EMTs: Paramedics gave "the reason in which DNR is not necessary", as being "due to unclear DNR decision time" whereas basic EMTs answered that this was "due to a legal problem" ($x^2$ = 12.680, p < .05). Paramedics disagreed with the statement, "It is natural for medical teams to have less interest in patients with DNT orders", whereas basic EMTs agreed with the statement ($x^2$ = 6.666, p < .05). Conclusion: A unified manual on attitude toward DNR orders, taking account of social and culture factors, needs to be developed. This research provides a base line for future research.

• 한국건축시공학회지
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• 제14권5호
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• pp.459-465
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• 2014

본 연구는 건설경기지표와 경영성과지표의 상관분석을 통해 기계중심 전문건설업체의 경영안정화 전략을 제시하고자 하였다. 기계중심 전문건설업체는 건설수주액의 영향력이 다소 작지만 유동자산회전율에 장기적으로 영향을 미치고 있어 건설수주액의 변화에 따른 유동자산의 확보를 위한 경영전략이 수립되어야 할 것으로 판단된다. 즉, 유동자산의 운용을 증가시킬 수 있다는 것을 의미하며, 이러한 활동성 및 유동성의 확보를 통해 안정성 지표인 자기자본비율을 증가시킬 수 있을 것으로 판단된다.