• 동력기계공학회지
• /
• 제17권6호
• /
• pp.102-107
• /
• 2013

In this paper, the performance analysis for evaporation capacity, total work and efficiency of the ocean thermal energy conversion(OTEC) power system using mixed refrigerant(R32,R152a) is conducted to find the effect of hot wasted water on OTEC power system. The system in this study is applied with two stage turbine, regenerator, cooler and separator on Organic Rankine Cycle. The commercial program HYSYS is used for the performance analysis. The main results were summarized as follows : The efficiency of the OTEC power cycle has a largely effect on the evaporation capacity and total work. As increasing temperature of heat source water, evaporator's capacity is decreased but total work increase. Otherwise, using hot wasted water bring effects not only increasing system efficiency but also declining evaporator's capacity. Thus With a thorough grasp of these effect, it is necessary to find way to use hot wasted water emitted by power plant and so on.

• 대한통합의학회지
• /
• 제11권3호
• /
• pp.137-145
• /
• 2023

Purpose : The purpose of this study was to identify the degree of work ethics of an occupational therapist and examine the correlation between work ethics and organizational commitment. In this study, we aimed to investigate the effects of occupational therapists' work ethics on organizational commitment. Through this study, we aim to determine the importance of work ethics and find a way to improve organizational commitment in occupational therapists. Methods : We conducted nationwide surveys on occupational therapists working in hospitals and other institutions from April 24, 2023 to May 30, 2023. We evaluated general characteristics, work ethics, and organizational commitment. General characteristics were analyzed using a frequency analysis. Work ethics and organizational commitment were examined using descriptive statistics. The correlation among work ethics and organizational commitment was analyzed using the Pearson correlation coefficient. Additionally, a multiple regression analysis was conducted to identify factors that affected organizational commitment. Results : The results of this study were as follows. First, the average score of work ethics was 3.32 ± .32. Second, a significant positive correlation was observed between work ethics and organizational commitment (p<.01). And as a result of the correlation between work ethics sub-factors and organizational commitment, wasted time (r=.261, p<.01), centrality of work (r=.366, p<.01), morality/ethics (r=.470, p<.01), leisure (r=.189, p<.05), delay of gratification (r=.410, p<.01), hard work (r=.437, p<.01), self-reliance (r=.233, p<.01) showed a statistically significant correlation. Third, the sub-factors of work ethics that influenced organizational commitment, including morality/ethics (𝛽=.302, p<.01), hard work (𝛽=.271, p<.01), and delay of gratification (𝛽=.205, p<.01) were identified. Conclusion : In conclusion, the results of this study underscore the importance of work ethics in influencing organizational commitment. Through this study, we recognized the importance of work ethics, which may serve as basic data to promote work ethics and improvement of organizational commitment.

• 대한기계학회논문집A
• /
• 제32권12호
• /
• pp.1140-1145
• /
• 2008

In conventional cutting system of Heat-Shrink-Tube, workers operate cutting system after considering about length and quantity of heat-shrink-tube. So, not only work time and production cost is increased but also material is wasted because the data that workers have to consider is so much. In this paper, an effective cutting system of heat-shrink-tube was developed to reduce production cost, work time and waste of material. The cutting system consists of a supervisory computer installed inside a control room, a on-site computer installed on the work area, and a PLC system. In the developed system, a supervisory computer send work order to the on-site computer using LAN and the on-site computer operates the cutting system of the heatshrink-tube after it makes an array production order. Also, the on-site computer reports information to the supervisory computer when an accident happened.

• 한국멀티미디어학회논문지
• /
• 제16권5호
• /
• pp.657-666
• /
• 2013

현대사회는 소셜 미디어, 비즈니스, 바이오 인포메틱스 같은 다양한 응용프로그램에서 지속적으로 생산되어 지고 있는 수많은 데이터의 빠른 유입으로 특징지어 지고 있다. 이에 따라 폭발적으로 증가하고 있는 대규모 데이터를 보다 효율적으로 분석하고 처리 할 수 있는 방법이 그 어느 때보다 강조 되고 있다. 지난 몇 년간 학계에서는 배치 지향 시스템 (batch oriented system) 환경 내에서 병렬 처리를 효과적으로 지원할 수 있는 맵리듀스 기법이 활발히 연구 되어 왔으며, 맵리듀스 기법은 다양한 분야에서 성공적으로 사용되고 있다. 그러나 이 기법은 데이터의 상대적 유용성 (data utility)을 고려하지 않기 때문에, 멀티미디어 응용프로그램 사용자의 특성 (즉, 높은 혹은 낮은 스코어를 가지는 몇몇 결과물에 관심을 가지는 사용자들의 특성)으로 인하여 효과적인 성능을 보여 주지 못하고 있다. 따라서 본 논문에서는 이러한 문제점을 해소하기 위해, 맵리듀스 상에서의 데이터 분할 방식을 제안한다. 또한, 제안된 분할 방식에 대한 성능 실험을 통하여 우리가 제안하는 데이터 분할 방식이 기존 방식보다 성능 향상을 자져올 수 있음을 보여준다.

• International Journal of Computer Science & Network Security
• /
• 제21권9호
• /
• pp.339-345
• /
• 2021

The rapid development of various applications in networking system, business, medical, education, and other domains that use basic data access operations such as insert, edit, delete and search makes data structure venerable and crucial in providing an efficient method for day to day operations of those numerous applications. One of the major problems of those applications is achieving constant time to search a key from a collection. A number of different methods which attempt to achieve that have been discovered by researchers over the years with different performance behaviors. This work evaluated these methods, and found out that almost all the existing methods have non-constant time for adding and searching a key. In this work, we designed a multi-indexes hashing algorithm that handles a collision in a hash table T efficiently and achieved constant time O(1) for searching and adding a key. Our method employed two-level of hashing which uses pattern extraction h₁(key) and h₂(key). The second hash function h₂(key) is use for handling collision in T. Here, we eliminated the wasted slots in the search space T which is another problem associated with the existing methods.

• 한국고분자학회:학술대회논문집
• /
• 한국고분자학회 2006년도 IUPAC International Symposium on Advanced Polymers for Emerging Technologies
• /
• pp.21-22
• /
• 2006

Significant progress has been realized in the design and synthesis of light emitting polymers with emission over the whole range of the visible spectrum. However up to seventy-five percent of charge recombination events can lead to triplet states that decay non-radiatively. Following the pioneering work in the field of small molecule organic light emitting devices it has been found that solution processible iridium polymer complexes can be used to harness the wasted triplet energy. In this paper new results concerning electrophosphorescence of solution processible tethered iridium polymer derivatives will be presented. Furthermore our approaches to the design of new high triplet energy conjugated polymer hosts will be reported.

• Macromolecular Research
• /
• 제15권2호
• /
• pp.129-133
• /
• 2007

Significant progress has been realized in the design and synthesis of light emitting polymers that emit over the entire visible spectrum. However, up to seventy-five percent of charge recombination events can lead to triplet states that decay non-radiatively. Following the pioneering work in the field of small molecule organic light emitting devices, it has been found that solution processible iridium polymer complexes can be used to harness the wasted triplet energy. In this paper, new results with respect to the electrophosphorescence of solution processible tethered iridium polymer derivatives are presented. Furthermore, our approaches to the design of new high triplet energy conjugated polymer hosts are also reported.

• 한국측량학회지
• /
• 제27권3호
• /
• pp.331-345
• /
• 2009

본 연구의 목적은 공간데이터 구축공정에 표준으로 적용 가능한 관리방법론을 연구하는데 있다. 우리나라는 아직까지 구축공정 및 품질관리에 대한 체계적인 기준인 정립되지 않은 실정이어서 국가예산이 낭비될 우려의 소지가 있다. 또한 현재 공간데이터 구축과 관련된 법규는 기준이 명확하지 않은 경우가 있어서 공간데이터의 품질에 대한 신뢰성이 부족한 실정이다. 공간데이터의 제작 및 품질검사와 관련이 있는 법규, 국토지리정보원에서 수행한 공간데이터의 품질관련 연구 등 각종 문헌자료, 지방자치단체의 지리정보시스템을 구축한 경험이 있는 주요 업체의 공간데이터 제작공정 및 작업방법에 대하여 조사, 분석하였다. 분석한 내용을 기반으로 GPS에 의한 기준점 측량, 수준측량, 항공사진촬영, 수치지도 제작, 지형도 제작, 수치표고자료 제작, 항공사진 DB 구축, 정사영상지도 제작 등 8개 사업을 대상으로 선정하고 표준화된 관리방법론을 제시하였다.

• 한국가구학회지
• /
• 제27권1호
• /
• pp.49-58
• /
• 2016

In modern society, designers started feeling moral and social responsibility in the aspect of environment as a position of suggesting something new. Rather than creating another waste to make something innovative, the concept of Upcycling which is about adding design or utilization to the existing recyclable materials to raise their value to products or art works has started settling down. Among them, there have been various researches on the use of offcut waste to be dumped. Such use of waste can be found in Jogakbo (patchwork), one of our traditional boudoir crafts. This could be connected to the concept of the modern Upcycling in the aspect of giving new values to the wasted pieces of fabric through needlework. Therefore, this study suggested Stitch work as new Upcycling furniture by seeking for the common connections between Upcycling and traditional Jogakbo, and then reinterpreting them in the same viewpoint. It was an opportunity not only to rediscover 'the esthetics of waste' by changing the awareness of 'behavior of dumping', but also to reinterpret or reconsider the tradition. Based on this, it is expected to continuously have new attempts to use offcut waste for eco-friendly design in the future, and also to have opportunities to seek for new directions of Upcycling to rediscover new values through the revaluation of valuelessness.

• Membrane and Water Treatment
• /
• 제13권3호
• /
• pp.121-128
• /
• 2022

A tremendous amount of energy resources is being wasted in cleaning wastewater to save the environment across the globe. Several different procedures are commercially available to process wastewater. In this work, membrane filtration technique is used to treat the textile wastewater because of its cost effectiveness and low environmental impacts. Mixed Matrix Membrane (MMM) consist of Polyvinyl Alcohol (PVA) in which Graphene Oxide (GO) was added as a filler material. Five different membranes by varying the quantity of GO were prepared. The prepared membrane has been characterized by Scanning Electron Microscopy (SEM), X-Ray Diffractometry (XRD), Fourier Transformed Infrared Spectroscopy (FTIR) and Water Contact Angle (WCA). The prepared membranes have been utilized to treat textile wastewater. The synthesized membranes are used for the elimination of total dissolve solids (TDS), total suspended solids (TSS), Methylene blue (MB) dye and copper metallic ions from textile wastewater. It is concluded that amount of GO has direct correlation with the quality of wastewater treatment. The maximum removal of TDS, TSS, MB and copper ions are found to be 7.42, 23.73, 50.53 and 64.5% respectively and are achieved by 0.02 wt% PVA-GO membrane.