• 대한방사선기술학회지:방사선기술과학
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• 제41권6호
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• pp.595-602
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• 2018

Quality control (QC) of Computed Tomography (CT) devices is based on image quality measurement on AAPM CT phantom which is a standard phantom. Although it is possible to control the accuracy of the CT apparatus, it is expensive and has a disadvantage of low penetration rate. Therefore, in this study, we make image quality measurement phantom at low cost using FFF (Fused Filament Fabrication) type three-dimensional printer and try to analyze the usefulness, compare it with existing standard phantom. To print a phantom, We used three-dimensional printer of the FFF system and PLA (Poly Lactic Acid, density: $1.24g/cm^3$) filament, and the CT device of 64 MDCT (Aquilion CX, Toshiba, Japan). In addition, we printed a phantom using three-dimensional printer after design using various tool based on existing standard phantom. For image quality evaluation, AAPM CT phantom and self-generated phantom were measured 10 times for each block. The measured data were analyzed for significance using the Mannwhiteney U-test of SPSS (Version 22.0, SPSS, Chicago, IL, USA). As a result of the analysis, phantom fabricated with three-dimensional printer and standard phantom showed no significant difference (p>0.05). Furthermore, we confirmed that image quality measurement performance of a phantom using three-dimensional printer is similar to the existing standard phantom. In conclusion, we confirmed the possibility of low cost phantom fabrication using three dimensional printer.

• 한국건축시공학회지
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• 제13권1호
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• pp.90-100
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• 2013

Deck-plates are widely used on construction sites, and have the advantage of enabling contractors to achieve a relatively uniform quality. But nevertheless, quality deviation in deck-plate construction can occur as the result of differences in site conditions and the experience of crew workers. In this study, the authors present a site quality evaluation prototype for building deck-plate construction. Through analyses of case studies and interviews with experts, standard quality check sheets and a quality management index were developed by estimating the importance of quality check items based on a Failure Mode and Effects Analysis (FMEA) method. The applicability and effectiveness of the prototype was evaluated through a case study and interviews with case participants. It was found that the prototype promoted an active quality management as a way of continuously improving quality management in deck-plate construction instead of passive quality inspection practice.

• 품질경영학회지
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• 제51권2호
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• pp.185-202
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• 2023

Purpose: The purpose of this study is to identify key performance evaluation items and factors that are effective and practical for project management of defense standard standard improvement projects, and to develop a quantitative performance evaluation model. Methods: For the development of a performance evaluation model for defense standard improvement projects, we analyzed past major project performance and derived evaluation items and factors. To increase the objectivity and efficiency of project evaluation, we developed an evaluation index that enables relative evaluation of evaluation targets, and calculated the main importance of evaluation items using the Analytic Hierarchy Process (AHP) method based on the main opinions of expert groups. Results: The study resulted in the identification of main performance items for defense standard improvement projects, which were classified into defense standard conformity review performance and defense standard improvement performance items. We also simplified the evaluation model by integrating various evaluation items into similar evaluation factors. Additionally, we developed a quantitative evaluation index that enables relative evaluation of the targets and verified the objectivity and validity of the suggested performance evaluation model by reevaluating it using performance data from past commissioned professional institutions Conclusion: Developing a quantitative evaluation model for defense standard improvement projects is expected to provide a means of measuring the effectiveness of the project, and to be used as a tool to determine the appropriateness and effectiveness of medium and long-term project plans.

• 무역상무연구
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• 제43권
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• pp.75-97
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• 2009

Article 35 of the CISG defines standards for determining whether goods delivered by the seller conform to the contract in terms of type, quantity, quality, and packaging. When we apply these article 35(1), (2) of the CISG to the business connection, we will face several issues in the business connection. Fist, we will face the interpretation of contracts. When we interpret the contract, we must remember the article 8 of the CISG. Statements made by and other conduct of a party are to be interpreted according to the intent of parties. Therefore parties of contract must describe their intent correctly. Second, we must make out a contract in written about the promised contents. And it is needed to insert a merger clause in order to prevent part of contract from disagreeing with each other. Third, there are several interpretation of fitness for the purpose for which the goods would ordinarily be used. So it is important to describe the quality standard to be applied. If it does not describe the standard, it is helpful to apply the reasonable quality test. Fourth, there may be some doubt regarding the question of whose standard-that of the seller's or that of the buyer's state-is relevant in order to determine which characteristics the goods must have in order to be fit for their ordinary purpose. Ultimately, the question of the relevant standard is a matter of the interpretation of the contract.

• 아태비즈니스연구
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• 제10권4호
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• pp.31-47
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• 2019

The recently revised Act on External Audit has taken effect as of November 2018, where standard audit hour rule is included to enhance the audit quality requiring appropriate audit hour input. It has two issues, one is how much the standard audit hours should be and the other is how to control the auditor proficiency between positions when deciding standard audit hours. This paper focuses on the latter issue and studies if auditor proficiency measured with the KICPA position proficiency weight is economically meaningful and has audit quality implication. The KICPA proficiency weights of partner and junior CPA are 1.2, and 0.4 with senior CPA being 1. The results are as follows. First, we find that the audit proficiency decreases discretionary accruals, the proxy of audit quality. Second, the degree to which the audit proficiency decreases discretionary accruals is pronounced with non-big4 firm. The results imply that the KICPA position proficiency weight reflects auditor experiences which help to improve audit quality.

• 한국산학기술학회논문지
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• 제21권9호
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• pp.128-133
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• 2020

본 연구는 고품질의 천일염을 생산하기 위한 제조공정의 실증연구를 위해 수행되었다. 이전의 연구에서 구명한 제조공정 설계기준을 실제 천일염 제조시스템에 적용하여 그 성능을 평가하였다. 본 연구에 적용된 설계인자는 건조열풍온도와 세정수의 온도이었으며, 설계기준은 각각 100 ℃이하, 10 ℃이하이었다. 공정의 성능평가기준은 천일염의 국제 식품기준 (I)(염도 95 %이상, 수분 4 %이하)과 고품질 천일염제조를 위한 품질기준 (II)(염도 97 %이상, 수분 2 %이하)의 두 가지를 적용하였다. 주요 품질평가 항목은 수분, 염도이었으며, color 특성도 측정하였다. Color 특성은 L*, a*, b*값과 백도를 측정하였고, 측정결과는 p<0.05수준에서 유의하였다. 천일염의 제조공정은 총 5단계(원료, 건조 전, 건조 후, 냉각 후, 최종제품)로 구분되며, 각 공정별로 품질의 변화를 측정하였다. 측정된 품질은 3단계 공정부터 국제품질기준 (I)을 만족하였다. 또한, 품질측정 결과는 4단계 공정부터는 고품질 천일염 제조기준 (II)을 만족하였다. 따라서 이러한 결과는 제시된 천일염 제조시스템의 성능이 적합한 것으로 나타내었다. 또한, 향후에 높은 수준의 제조기준을 적용한 고품질 천일염 제조기술을 통해서 국제 시장에서의 품질 경쟁력을 확보할 것으로 기대된다.

• 한국경영과학회지
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• 제39권1호
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• pp.1-12
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• 2014

This article proposes a variable sampling interval (VSI) $\bar{X}$ control chart using weighted standard deviation (WSD) method for skewed populations. The WSD method decomposes the standard deviation of a quality characteristic into upper and lower deviations and adjusts control limits and warning limits of a control chart in accordance with the direction and degree of skewness. A control chart constant is derived for estimating the standard deviation of skewed distributions with the mean of sample standard deviations. The proposed chart is compared with the conventional VSI $\bar{X}$ control chart under some skewed distributions. Simulation study shows that the proposed WSD VSI chart can control the in-control average time to signal (ATS) as an adequate level better than the conventional VSI chart, and the proposed chart can detect a decrease in the process mean of a quality characteristic following a positively skewed distribution more quickly than the standard VSI chart.

• 한국작물학회지
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• 제47권
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• pp.200-215
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• 2002

There are some international standards and organization controling the quality characteristics of varieties and seeds such as UPOV, OECD, ISTA, AOSA. The National List system to check variety performance such as quality characteristics of plant varieties and seeds was established by each countries. The UPOV (International Union for the Protection of New varieties of Plant) regulates the requirement of plant variety protection that is distinctness (D), uniformity (U), stability (S) (here in after called DUS), Novelty and Denomination, and some quality characteristics are used to examine the requirement of plant variety protection by each crops. OECD (Organization for Economic Cooperation Development) seed scheme regulates the seed certification for seed trade between countries. ISTA (International Seed Testing Association) and AOSA(Association for Official Seed Analyst) regulates the seed analysis standard and methods. Most of the countries in Europe has the National List system, which check the value for cultivation and use(VCU), that is to say, variety performance such as yield, quality and stress to environment. All the seeds should be enlisted in the National List before sell the seed in their country. All the quality characteristics checked variety performance are for instance, amylose and amylopectin content in rice, molting quality, $\beta$-glucan, protein in barley, protein and sugar content in soybean, sugar and amylopectin content in corn etc. Conditions for the protection of new variety of plant are DUS. Quality characteristics may be the important characteristics and used to check DUS in crop by crop. It is very important to develop a new characteristics and establish standard method fur examine the VCU and DUS test for each crop.

• 한국컴퓨터정보학회논문지
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• 제23권11호
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• pp.143-149
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• 2018

The purpose of this study is to propose a management method to maintain the pleasant indoor air quality of the dental clinic by measuring and analyzing the indoor air quality of the dental clinic. The measurement was conducted in two rooms, a lobby where many residents stay in the reception room for waiting for medical treatment, and a VIP room where treatment activities are mainly performed. Measurement items are Temperature, Humidity, $CO_2$, CO, $NO_2$, $CH_2O$, VOC, $PM_{10}$ and measurement were taken on April 27, 2018. As a result of analyzing the temperature and humidity of the dental clinic, it was analyzed that the average indoor temperature was maintained at $25^{\circ}C$ and the humidity was kept at around 50%, maintaining proper indoor temperature and humidity environment. $CO_2$ was 855ppm in the VIP Room, which satisfied the maintenance standard. In the case of the lobby, it was analyzed to be 1,160ppm, which exceeded the maintenance standard and it is judged that the carbon dioxide generated by the respiration of the people staying in the lobby is the main reason. The mean concentration of formaldehyde in the VIP room was analyzed as $436{\mu}g/m^3$, exceeding the maintenance standard, and $2,100{\mu}g/m^3$ for the VOC exceeded the recommended standard. It was analyzed that the concentration was relatively higher due to the use of disinfectant and other drugs. The mean concentration of PM-10 in the lobby was analyzed as $65{\mu}g/m^3$ and it was analyzed that it satisfied the maintenance standard. To maintain a pleasant indoor air quality in a dental clinic it is necessary to minimize the effects of formaldehyde, VOC, $CO_2$ in the VIP rooms and lobby. For this purpose, the entire ventilation system and air purification system of the dental clinic should be installed. In case of the VIP room, local exhaust ventilation should be installed and workers should wear personal protective equipment.

• 한국물환경학회지
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• 제36권5호
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• pp.364-372
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• 2020

The "Master Plan for the Revitalization of Water in the Nakdong River" is designed for the fundamental improvement of water quality in the Nakdong River. The water quality and flow of the Nakdong River system tributaries was monitored in this study. Among the living environmental standard parameters of 195 rivers, BOD (Biochemical oxygen demand), T-P (Total phosphorus) and TOC (Total organic carbon) were assessed to analyze the water quality from 2012 to 2019. We examined the role of TOC. It was found that 12 rivers exceeded the water quality of the second grade (3.0 mg/L BOD standard, 0.1 mg/L T-P standard, 4.0 mg/L TOC standard) based on BOD and T-P concentrations: the Gumi stream, Gisegok stream, Yongha stream, Yongho stream, Changnyeong stream, Gajwa stream, Gwangok stream, Yeongsan stream, Toerae stream, Hwapo stream, Sangnam stream and Hogye stream. These rivers require strategies to improve the quality of the Nakdong River. Based on the ongoing project, it is possible to supplement the "Master Plan for the Revitalization of Water in the Nakdong River" and manage it after verifying it as a component of people's life and therefore used to establish water quality control measures.