• Title/Summary/Keyword: Required

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Required Pressurant Mass for Cryogenic Propellant Tank with Pressurant Temperature Variation (가압가스 온도에 따른 극저온 추진제탱크 가압가스 요구량)

  • Kwon, Oh-Sung;Kim, Byung-Hun;Cho, In-Hyun;Ko, Young-Sung
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.38 no.12
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    • pp.1202-1208
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    • 2010
  • The prediction of the required pressurant mass for maintaining the pressure of propellant tanks during propellant feeding is an important issue in designing pressurization system. The temperature of pressurant fed into propellant tank is the critical factor in the required pressurant mass and is one of the most crucial design parameters in the development of pressurization system including designing the weight of pressurant tanks and the size of heat exchanger. Hence a series of propellant drainage tests by pressurizing propellant stored in a cryogenic propellant tank have been performed with measuring the temperature distribution inside ullage and the required pressurant mass according to the temperature condition of pressurant. Results shows that the required pressurant mass decreases as the temperature of pressurant increases. However, the rate of the actual pressurant mass to the ideal required pressurant mass increases.

An Empirical Study on Setting Up of an Appropriate Organization for Efficient Operation of ERP Systems (ERP 시스템의 효율적 운영을 위한 적정 조직 설계에 대한 실증적 연구)

  • Nam, Ho-Ki;Park, Sang-Min;Kim, Jhong-Hyun
    • Journal of the Korea Safety Management & Science
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    • v.12 no.4
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    • pp.117-125
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    • 2010
  • Today, many companies have introduced an ERP system - an enterprise resources planning - in order to improve corporate credibility through transparent management and for quick responses to market situations through quick decision making. After the construction of an ERP system, many companies are having difficulty in calculating the appropriate number of personnel required for running the system because of a lack of standard for doing so, as well as a lack of pertinent procedures. As a result, the companies are having to resort to a trial-and-error approach. Therefore this paper studied a model for calculating the appropriate number of personnel required for efficiently running an ERP system after its construction, as well as for constantly meeting its performance targets. The developed model was applied empirically to calculate an appropriate number of personnel required, and an organization was set up according to this. Therefore, the purpose of this study was to present an optimized model for calculating the number of personnel required for operating an ERP system, that which addresses problems of existing models, in order to help companies organize the operation personnel and its size, as well as to provide more objectivity to the calculated number of personnel required and to improve credibility.

A Systematization Model of the Design Phase VE Selection by the Analysis of the Required Items in the Apartment (공동주택 설계VE의 요구항목 분석을 통한 대상선정 체계화 모델)

  • Jung, Ho-Geun;Yang, Jin-Kook;Lee, Sang-Beom
    • Proceedings of the Korean Institute Of Construction Engineering and Management
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    • 2007.11a
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    • pp.1015-1018
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    • 2007
  • VE is one of the most effective and systematic tool available to achieve the required function at minimum cost and manage in many industrial fields. The purpose of the preparation phase VE job plan is to establish a cooperation system referring to groups for the successful implementation of VE, and to achieve a common objective to collect sufficient materials required in the analysis phase. The Quality Model is used to measure the requirement of shareholders(users and owners)in the project. It also offers a guideline on decision making when executing the function definition, function arrangement, function evaluation, and the idea evaluation of VE. However, the current the preparation phase business confirms that the required items of owners and users has not suggested definite goals and directions. This study analyzes the problems of current work in the preparation phase from case study, survey and interviews of experts. It then proposes a new process after understanding the required items of owners, users and experts.

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Improved Method for VE Items Selection by Analysing the Required Items of Stakeholder on the Apartment in Design Phase (공동주택의 설계VE단계에서 주체별 요구항목 분석을 통한 대상선정 개선방안)

  • Jeong, Ho-Geun;Yang, Jin-Kook;Lee, Sang-Beom
    • Korean Journal of Construction Engineering and Management
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    • v.9 no.4
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    • pp.111-119
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    • 2008
  • VE is one of the most effective and systematic tool available to achieve the required function at minimum cost and manage in many industrial fields. The purpose of the preparation phase VE job plan is to establish a cooperation system referring to groups for the successful implementation of VE, and to achieve a common objective to collect sufficient materials required in the analysis phase. The Quality Model is used to measure the requirement of shareholders(users and owners)in the project. It also offers a guideline on decision making when executing the function definition, function arrangement, function evaluation, and the idea evaluation of VE. However, the current the preparation phase business confirms that the required items of owners and users has not suggested definite goals and directions. This study analyzes the problems of current work in the preparation phase from case study, survey and interviews of experts. It then proposes a new process after understanding the required items of owners, users and experts.

A Study on Countermeasure against Trauma and PTSD of Police Officers -Focused on In-depth Interview with Targets- (경찰공무원의 심리적 외상(Trauma)과 외상후 스트레스 장애(PTSD) 대응 방안에 관한 연구 -대상자 심층면접을 중심으로-)

  • Kang, Gil-Ju;Lee, Sang-Yeol
    • Korean Security Journal
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    • no.56
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    • pp.31-54
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    • 2018
  • The objective of this study is to provide psychological welfare promotion method of police officers who experience trauma and PTSD due to police activity in local community while handling various accidents and protecting civil life and safety at the forefront of the national disaster accident site. For this objective, following countermeasure was presented through trauma/PTSD-related literature and in-depth interview with police officers who experienced trauma and PTSD. First, psychological examination is required to be performed positively and realistically for the police officers. As police officers have high emotional labor stress not only by physical burden but also by civil service, a regular psychological examination shall be established systematically together with physical rest. Second, proper action for the regular psychological examination result of the police officers is required. Third, a psychological support system for the police officers is required to be established and for this objective, expansion of police-operated mindful accompanying center and its devoted operation are required to be performed. Fourth, an opportunity of getting rid of stress of police officers shall be provided and for this objective, required budget for activating club activity is required to be allocated and activity condition should be created.

Prediction of Shunt-Dependent Hydrocephalus after Primary Supratentorial Intracerebral Hemorrhage with a Focus on the Influence of Craniectomies

  • Park, Yong-sook;Cho, Joon
    • Journal of Korean Neurosurgical Society
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    • v.65 no.4
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    • pp.582-590
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    • 2022
  • Objective : Hydrocephalus after intracerebral hemorrhage (ICH) is known to be related to poor prognosis and mortality. We analyzed predictors of permanent hydrocephalus in the patients with surgically treated supratentorial ICH. Methods : From 2004 to 2019, a total of 414 patients with surgically treated primary supratentorial ICH were included. We retrospectively analyzed age, sex, preexisting hypertension and diabetes, location and volume of ICH, presence and severity of intraventricular hemorrhage (IVH), and type of surgery. Results : Forty patients (9.7%) required shunt surgery. Concomitant IVH was higher in the 'shunt required' group (92.5%) than in the 'shunt not required' group (67.9%) (p=0.001). IVH severity was worse in the 'shunt required' group (13.5 vs. 7.5, p=0.008). Craniectomy (47.5%) was significantly high in the 'shunt required' group. According to multivariable analysis, the presence of an IVH was 8.1 times more frequent and craniectomy was 8.6 times more frequent in the 'shunt required' group. In the comparison between craniotomy and craniectomy group, the presence of an IVH was related with a 3.9 times higher (p=0.033) possibility and craniectomies rather than craniotomies with a 7-times higher possibility of shunt surgery (p<0.001). Within the craniectomy group, an increase in the craniectomy area by 1 cm2 was correlated with a 3.2% increase in the possibility of shunt surgery (odds ratio, 1.032; 95% confidence interval, 1.005-1.061; p=0.022). Conclusion : Presence of IVH, the severity of IVH and decompressive craniectomy were related to the development of shunt dependent hydrocephalus in the patients with ICH. The increasing size of craniectomy was related with increasing rate of shunt requirement.

Estimation of Appropriate Number of Radiologic Technologist Based on Analysis of Time Required for Computed Tomography (전산화단층촬영의 소요시간 분석에 기반한 방사선사의 적정인력 산정에 관한 연구)

  • Lee, Ki-Baek;Kim, Yung-Kyoon;Kim, Eun-Hye;Kim, Yon-Min
    • Journal of radiological science and technology
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    • v.45 no.3
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    • pp.213-223
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    • 2022
  • Although the number of computed tomography(CT) is increasing every year, it is insufficient to establish appropriate workload calculation standards of radiologic technologist to provide optimal medical services to patients, such as patient safety management and infection management. The purpose of this study is to present guidelines for calculating the appropriate workload of radiologic technologist by analyzing the work flow of CT procedures and the time required for CT examination in major hospitals. As for the study subjects and methods, the appropriate process for each step of CT examination was investigated to systematically present the process and time required for the actual examination, and the CT procedure time of 104,105 adult patients and 465 pediatric patients under the age of 6 were analyzed. For the time required, data according to the use of contrast medium, procedure type, and adult/child were collected and compared. The test time of CT examination using contrast medium took about 13 minutes when one radiologic technologist worked and about 9 minutes when two radiologic technologists worked. The time required for the procedures were statistically significant depending on the presence or absence of contrast medium, multi-phase procedure, and patient age (considering pediatric patients). As a result, in order to thoroughly perform patient safety and infection management, the appropriate workload increased by about 40% when there were two radiologic technologists. The limit workload was an average of 32 people per day with one radiologic technologist per 15 minutes, and 48 people per day with two radiologic technologist per 10 minutes. This is a marginal workload, and in the case of procedures that require more time to acquire radiographic images, the interval between reservations should be widened.

Methodology for Deriving Required Quality of Product Using Analysis of Customer Reviews (사용자 리뷰 분석을 통한 제품 요구품질 도출 방법론)

  • Yerin Yu;Jeongeun Byun;Kuk Jin Bae;Sumin Seo;Younha Kim;Namgyu Kim
    • Journal of Information Technology Applications and Management
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    • v.30 no.2
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    • pp.1-18
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    • 2023
  • Recently, as technology development has accelerated and product life cycles have been shortened, it is necessary to derive key product features from customers in the R&D planning and evaluation stage. More companies want differentiated competitiveness by providing consumer-tailored products based on big data and artificial intelligence technology. To achieve this, the need to correctly grasp the required quality, which is a requirement of consumers, is increasing. However, the existing methods are centered on suppliers or domain experts, so there is a gap from the actual perspective of consumers. In other words, product attributes were defined by suppliers or field experts, but this may not consider consumers' actual perspective. Accordingly, the demand for deriving the product's main attributes through reviews containing consumers' perspectives has recently increased. Therefore, we propose a review data analysis-based required quality methodology containing customer requirements. Specifically, a pre-training language model with a good understanding of Korean reviews was established, consumer intent was correctly identified, and key contents were extracted from the review through a combination of KeyBERT and topic modeling to derive the required quality for each product. RevBERT, a Korean review domain-specific pre-training language model, was established through further pre-training. By comparing the existing pre-training language model KcBERT, we confirmed that RevBERT had a deeper understanding of customer reviews. In addition, all processes other than that of selecting the required quality were linked to the automation process, resulting in the automation of deriving the required quality based on data.

A study on the effects of exhaust emission standards on the required ventilation rate in vehicle tunnels (차량 배출가스 규제기준이 소요환기량에 미치는 연구)

  • Kim, Hyo-Gyu;Ryu, Ji-Oh;Song, Seog-Hun;Jung, Chang-Hoon
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.19 no.3
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    • pp.409-420
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    • 2017
  • The amount of ventilation required in making the tunnel ventilation plan is an important factor for determining the capacity of the ventilation system. The amount of pollutant emission for each type of vehicle (basic emission amount for the design of ventilation volume) for estimating the required ventilation amount is based on the 'Standard for Allowing the Emission for the car manufacturing', proposed by Ministry of Environment. However, in 2013, the Ministry of Environment announced the 'Regulations on the calculation method of total emissions from vehicles' as a regulation for calculating the pollutants emitted from vehicles. In this regulation, there are the 'Emission factors for each type of vehicle'. Therefore, it is necessary to review the application of the Regulation to the estimation of the required ventilation volume for the road tunnel. In this study, the influence of the strengthened emission regulation in 2015 caused by the case of manipulation of emission volume for the diesel vehicle on the calculation of the required ventilation volume in the road tunnel has been checked. In addition, in this study, the required ventilation volume calculated according to the Standard for Allowing the Emission for the car manufacturing revised by Ministry of Environment and "Emission factors for each type of vehicle" and that calculated according to the EURO emission standard were compared for analysis. This study has implications that it provides the basic design data for calculating the reasonable ventilation capacity of the ventilation system based on the ground for calculating the required ventilation volume.