• Title/Summary/Keyword: life-cycle

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Performance Evaluation of Rough Rice Low Temperature Drying Using Heat Pump (열펌프를 이용한 벼의 저온건조성능평가)

  • Kim, Hoon;Han, Jae-Woong
    • Food Engineering Progress
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    • v.13 no.4
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    • pp.308-313
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    • 2009
  • This study was conducted to design and fabricate a heat pump that can produce some weather conditions similar to those of the dry season of the rough rice in Korea, and to investigate basic performances of the apparatus. During the drying test, the amount of energy consumption and drying characteristics were measured at four different temperature levels ranging between 20$^{\circ}C$ and 50${^{\circ}C}$. In the psychrometric chart, the freezing capacity and refrigerant circulation ratio of the heat pump were 173 kJ/kg and 49.6 kg/hr, respectively. Therefore, coefficient of performance was 5.5, which was superior to that of refrigerant R-22 (4.0) in standard refrigeration cycle. In addition, the time to reach target drying temperature (30${^{\circ}C}$) and relative humidity (40%) were 6 minutes and 7 minutes, respectively. Temperature differences between the drying temperature and the rice were 1.5${^{\circ}C}$ and 8.5${^{\circ}C}$ at the drying temperatures of 21.9${^{\circ}C}$ and 48.7${^{\circ}C}$, respectively. This result demonstrated that the increased temperature of the rice in the drying section decreased sufficiently in the tempering section. At the drying temperatures of 21.9, 30.7 38.8, and 48.7${^{\circ}C}$, drying rates were 0.29, 0.61, 0.85, and 1.26%/hr, respectively, which were similar to those of commercial dryer. In addition, the amounts of energy consumption were 325, 667, 692, and 776 kJ/kg, respectively. These results showed that this dryer saved up to 86% of energy consumption compared with the commercial dryer, which uses 4,000-5,000 kJ/kg of fossil fuel.

Record management system and Registry System in the Gabo Reform (갑오개혁기 기록관리제도와 등기실체제(Registry System))

  • Lee, Seung-Hwi
    • The Korean Journal of Archival Studies
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    • no.17
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    • pp.85-114
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    • 2008
  • One of the features of record management during the Gabo Reform is that the documents office controled producing and distribution of records. The records completed the operations were sent the record office and classified and arranged. previous researches understood this record management system during Gabo Reform were introduced from Japan. This article clarifies that new record management system settled through Meiji Restoration were introduced from German(Prussian) registry system at the time. However, German registry system managed current records and this system was based on modern record management system which open the records to the public with archives. Japan accepted only registry system, current record management system of German, and didn't established archives at Meiji regime. It is same with Joseon Dynasty during the Gabo Reform regime. Therefore, the record related regulation at the Gabo Reform regime could not be judged to be a modern system. The regulations on records at Gabo Reform regime had no terms about people's right or open the records to the public which decides modern record regulations. The meaning of record system during Gabo Reform regime is that the value of records and name of organizations coincides with record life cycle. The documents office managed current records and record office classified and filed closed records. Concept of "current record=document=documents office, non-current record=record= record office" didn't succeed to today. The term 'record' is used as current record or non-current record without difference.

A Study on Management and Utilization of Non-disclosure Records (비공개 기록의 관리와 활용에 관한 연구)

  • Ahn, Ji-Hyun
    • The Korean Journal of Archival Studies
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    • no.13
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    • pp.135-178
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    • 2006
  • The response of public organizations on information offerings has affirmed that the arrangement of the management of records is an important project to be implemented ahead of the enforcement of the information disclosure system. In particular, the absence or non-disclosure of information of public organizations on records containing significant information and abuse of the secret disposition of information has demonstrated that it is imperative to improve radically the management of secret or non-disclosed records as well as overall changes of awareness. This study reviewed the reality of the current non-disclosure and management of confidential records based on the awareness on such records and proposed improvement measures. The study on non-disclosed and confidential records has been discussed from legal and administrative perspectives so that the main focus has been on the institutional aspect. Yet, there is a limitation on such discussions in that there cannot be fundamental access to issues of non-disclosed and confidential records. That is because the management of information classified as non-disclosed and confidential can be improved fundamentally when all processes from the production of the records to their management are carried out reasonably. Accordingly, since our record management system is divided into three phases of the disposition division, record center, and archives and takes a management record by being applied to the flow of the life cycle of records, we have reviewed overall issues from the production of non-disclosed and confidential records to the utilization of the records pursuant to these steps and offered directions for improvement.

Enterprise Competitiveness and Corporate Performance Creation Strategies by Stage of Growth on Firm (벤처기업의 성장단계별 기업경쟁력 및 기업 성과 창출 전략)

  • Park, DaIn;Park, ChanHi
    • Asia-Pacific Journal of Business Venturing and Entrepreneurship
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    • v.13 no.6
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    • pp.177-189
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    • 2018
  • Business environment is always full of challenges. Despite various strategic efforts, there are so many failure cases of misfit. With the weaker resource base and institutional foundation, startup firms find it more difficult to find the right spot in the stiff competition. In the middle of evolutionary process, the startup firms need proper strategies meeting the differential challenges along the multiple stages of growth. Following the idea of product life cycle, this study applies the four stages of growth-startup, initial growth, accelerated growth, matured, and decliing. The next step for the startup manager is meeting each stage of growth with proper strategic efforts, including strategy, structure, decision-making pattern, and control method. When the knowledge factor is introduced, there is a potential for higher performance. Based on the 'Detailed Survey on Startup Ventures in 2017,' this study explores the impact of the government subsidy program on the firm competitiveness and performance-along the four stages of growth. In each stage, the strategy factors showed differential impact.

Development of Model Requirements Checklist for Utilizing BIM in Construction Phase - Focused on the MEP - (시공단계 BIM 활용을 위한 모델 요구조건 체크리스트 개발 - MEP를 중심으로 -)

  • Kim, Woojin;Park, Jinho;Cha, Yongwoon;Hyun, Changtaek;Han, Sangwon
    • Korean Journal of Construction Engineering and Management
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    • v.20 no.1
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    • pp.22-31
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    • 2019
  • The application of BIM that can manage and integrate information generated during the entire life cycle of buildings in domestic and overseas construction projects is becoming active. When BIM is utilized in the construction phase, it can shorten the construction period, reduce the occurrence of reworks and improve collaboration capability. However, there are limitations in applying BIM to the construction phase due to the insufficient definition level of domestic BIM guidelines and inadequate design standards. In this regard, this study developed BIM model requirements checklist for the application of BIM in the construction phase. To develop the checklists, 21 domestic and overseas BIM guidelines, three public construction projects and four private construction projects to which construction BIM was applied, were analyzed. Based on the guidelines and cases, a total of 62 construction BIM model requirements (31 model objects and 31 attribute rules) and proposed construction BIM model requirement checklists by dividing the 61 requirements according to the requirement and purpose for utilization were identified. It is expected that the practical applications of the checklists proposed in this study will improve the level of BIM model in construction phase. In addition, this study has its significance as a basic research that can be used in the development of standardized guidelines for BIM model in construction phase from academic aspects.

Carbon Footprint Analysis of Mineral Paper using LCA Method (전과정 평가기법을 활용한 미네랄 페이퍼의 탄소발자국 연구)

  • Kim, Byoung Jik;Kang, Seong Min;Lee, Jeongwoo;Sa, Jae Hwan;Kim, Ik;Jeon, Eui Chan
    • Journal of Climate Change Research
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    • v.4 no.3
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    • pp.201-210
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    • 2013
  • In recent years, with the rising interest to reduce greenhouse gas emissions, the demand for using environmentally friendly product with low greenhouse gas emission is increasing in the printing industry as well. In this study, the carbon footprint of environmentally friendly product mineral paper that uses less plastic and wood than normal printing paper materials was analyzed by utilizing the life cycle assessment (LCA) technique. An analysis utilizing the LCA technique was done per the Korea carbon footprint certification guidelines and, for scope of study, it included the premanufacturing stage and manufacturing stage except for the use and disposal stages. As a result of the study, the emission coefficient of the mineral paper was calculated to be $0.81kg\;CO_2eq/kg$ and the emission from electricity usage of the entire greenhouse gas emission was calculated to be 45.85% ($0.37kg\;CO_2eq/kg$). In order to reduce greenhouse gas emission, required are the efforts to reduce the environmental loads by using energies that have relatively lower environmental loads, such as improvement in electricity usage efficiency and renewable energy, by increasing product completion rates during the manufacturing process of mineral paper.

Basic Research for Preparation of a Disabled-Inclusive Public Disaster Management System (장애포괄적 재난관리체계 마련을 위한 기초 연구)

  • Kim, Soungwan;Roh, Sungmin
    • 재활복지
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    • v.20 no.1
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    • pp.1-22
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    • 2016
  • This research aimed to examine the problems in a current national emergency management system that does not consider the disabled in the face of manmade catastrophes and natural disasters, and to conduct an expert opinion survey to explore the direction of disabled-inclusive public disaster management system. As a result of the analysis, the respondents of the survey revealed a need for a designated government department for disaster management systems for the disabled and the experts preferred the Ministry of Public Safety and Security (50%) than the Ministry of Health and Welfare (37.5%). However, 12.5% of the surveyed experts perceived cooperation between the two Ministries, rather than selecting a certain ministry, as necessary to establish a disaster management system for the disabled. Additionally, the experts recognized the response period (43.8%) of the disaster management life cycle to be the most important phase. Thus, at the disaster response period, the experts suggested utilizing an emergency alarm system to effectively rescue the disabled in the face of disaster. Based on this discussion, the paper explores ways to establish a disabled-inclusive public disaster management system.

Evaluation of Mitigation Technologies and Footprint of Carbon in Unhulled Rice Production (벼 생산 단계에서 탄소발생량과 감축요소 평가)

  • Lee, Deog Bae;Jung, Soon Chul;So, Kyu Ho;Jeong, Jae Woo;Jung, Hyun Chul;Kim, Gun Yeob;Shim, Gyo Moon
    • Journal of Climate Change Research
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    • v.3 no.2
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    • pp.129-142
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    • 2012
  • This study was carried out to evaluate carbon footprint during unhulled rice production and to compare mitigation technologies of methane, main carbon source during rice production, Carbon footprint of unhulled rice was a sum of $CO_2$ emission of agri-materials manufacture, rice cultivation and waste treatment. It was emitted 1.40 kg $CO_2$ during unhulled rice production, its distribution was 71.1% by $CH_4$ emission of rice cultivation, 11.8% of $N_2O$ emission by nitrogen application and 7.6% of complex fertilizer manufacture. $CH_4$ emission could be mitigated by some technologies; cultivation of the early maturing rice variety emitted lower by 44.4% than the mid maturing variety, intermittent drainage of submerged water by 43.8% than the continuous flooding condition, direct seeding by 32.0% than transplanting cultivation, no-ploughing by 20.9% than ploughing cultivation. It means that LCA on Global Warming Potential and the statistical data on innovated technical practice are key tools to systemize Measurable-Reportable-Verifiable (MRV) system for carbon footprint and carbon emission trade in the farm base.

The Improvement of maintainability evaluation method at system level using system component information and fuzzy technique (시스템의 구성품 정보와 퍼지 기법을 활용한 시스템 수준 정비도 평가 방법의 개선)

  • Yoo, Yeon-Yong;Lee, Jae-Chon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.20 no.3
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    • pp.100-109
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    • 2019
  • Maintainability indicates the extent to which maintenance can be done easily and quickly. The consideration of maintainability is crucial to reduce the operation and support costs of weapon systems, but if the maintainability is evaluated after the prototype production is done and necessitates design changes, it may increase the cost and delay the schedule. The evaluation should verify whether maintenance work can be performed, and support the designers in developing a design to improve maintainability. In previous studies, the maintainability index was calculated using the graph theory at the early design phase, but evaluation accuracy appeared to be limited. Analyzing the methods of evaluating the maintainability using fuzzy logic and 3D modeling indicate that the design of a system with good maintainability should be done in an integrated manner during the whole system life cycle. This paper proposes a method to evaluate maintainability using SysML-based modeling and simulation technique and fuzzy logic. The physical design structure with maintainability attributes was modeled using SysML 'bdd' diagram, and the maintainability was represented by an AHP matrix for maintainability attributes. We then calculated the maintainability using AHP-based weighting calculation and fuzzy logic through the use of SysML 'par' diagram that incorporated MATLAB. The proposed maintainability model can be managed efficiently and consistently, and the state of system design and maintainability can be analyzed quantitatively, thereby improving design by early identifying the items with low maintainability.

Recessive Resistance: Developing Targets for Genome Editing to Engineer Viral Disease Resistant Crops (바이러스 열성 저항성: 병저항성 작물 개발을 위한 유전자 교정 소재 발굴 연구의 동향)

  • Han, Soo-Jung;Heo, Kyeong-Jae;Choi, Boram;Seo, Jang-Kyun
    • Research in Plant Disease
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    • v.25 no.2
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    • pp.49-61
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    • 2019
  • Plant viruses are among the important pathogens that cause severe crop losses. The most efficient method to control viral diseases is currently to use virus resistant crops. In order to develop the virus resistant crops, a detailed understanding of the molecular interactions between viral and host proteins is necessary. Recessive resistance to a pathogen can be conferred when plant genes essential in the life cycle of a pathogens are deficient, while dominant resistance is mediated by host resistance (R) genes specifically interacting with effector proteins of pathogens. Thus, recessive resistance usually works more stably and broadly than dominant resistance. While most of the recessive resistance genes have so far been identified by forward genetic approaches, recent advances in genome editing technologies including CRISPR/Cas9 have increased interest in using these technologies as reverse genetic tools to engineer plant genes to confer recessive resistance. This review summarizes currently identified recessive resistance genes and introduces reverse genetic approaches to identify host interacting partner proteins of viral proteins and to evaluate the identified genes as genetic resources of recessive resistance. We further discuss recent advances in various precise genome editing technologies and how to apply these technologies to engineer plant immunity.