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제조업의 품질보증체제 확립을 위한 협력업체 관리방안 연구
이정석 인하대학교 공학대학원 2008 국내석사
품질보증(Quality Assurance)이란 간단히 말해서 고객의 요구에 맞는 품질을 보증하는 것으로 검사위주의 소극적인 활동에서 제조공정에서부터 고객의 기대를 만족시키는 제품을 생산할 수 있는 공정관리 위주의 품질보증을 넘어 제품의 기획 및 개발 단계에서부터 고객의 기대를 충족시킬 수 있는 제품을 생산하기 위한 예방 위주의 품질보증활동으로 변천 되어져 왔다. 이러한 흐름 속에서 기업들은 예방위주의 품질보증체계 확립을 위해 각고의 노력을 기울이고 있고 개별 회사들에 적합한 품질보증체계를 개발하고 있다 그러나 점차 기업들의 외주 협력회사 의존도가 높아지고 있고 자체 품질보증체계 강화만으로는 고객의 기대가치에 부응하기 어렵고 지속적인 품질비용의 증가라는 어려움에 직면하게 된다. 본 논문에서는 국내의 문헌 조사와 함께 협력업체의 선정 및 평가 관리 그리고 지원, 육성방안에 대해 알아보았다. 또한, 국내의 ‘R'사와 ’D'사의 품질보증체제의 확립을 위한 업체평가 관리 및 지원‧육성책에 대한 근래의 개선의 사례를 들어 분석한 후 그 문제점을 도출하였다. 이러한 문제점에 대한 해결책으로 모업체와 실효성있는 공급체인상의 품질보증체계 확립을 위한 의식전환의 방향과 합리적인 업체평가와 개별 협력업체에 적합한 지원/육성 방향을 정립하고자 하였다. 실질적 업체평가를 위한 협력업체 분류‧세분화를 통해 모업체는 공급시장 상황이나 여건의 변화에 따라 신속하고 유동적인 변화를 꾀할 수 있고 시장상황에 적합한 구매전략수립을 할 수 있으며 구매전략과 연계한 업체평가를 통해 차별화된 육성/지원/퇴출 전략을 수행할 수 있게 된다. 또한 다각화된 협력업체 지원‧육성방안의 적용 시 각 그룹별 협력업체들에게 적합하고 모업체의 전략과 목표 달성을 위해 실질적 기업활동이 가능하게 됨으로서 다변화된 고객 품질에 대한 기대충족에 부응하고 모업체와 협력업체간 불신의 벽을 넘어 상호신뢰를 바탕으로 한 자율적인 협력관계를 촉진시키고 질적 심화를 이루어 낼 수 있는 여건조성의 틀을 마련하게 될 것이다
인산염과 가스흡수제 첨가를 통한 된장의 褐變進行 抑制에 대한 硏究
李政石 忠南大學校 産業大學院 2005 국내석사
Browning of commercial Doenjang product during storage and marketing is a main concern in the industry. There have been many studies on the improvement on the quality of Doenjang. In this study, phosphate and gas absorber treatments ware introduced in manufacturing of Doenjang to improve the color of commercial Doenjang. Doenjang treated with phosphate and gas absorber(sample C), Doenjang treated with phosphate only (sample B), and the control were prepared and their physicochemical and sensory properties were determined during storage at 30℃ for 28 days. Sample C was the best in terms of color as well as sensory evaluation according to panel test, resulting in preventing browning of Doenjang during storage. Sample B was also better than control. These results suggest that commercial production of Doenjang should introduce phosphate and gas absorber treatment to improve the quality of Doenjang and prevent undesirable browning reaction during storage and marketing.
해사 빅데이터를 활용한 공간분석 알고리즘 기반의 해상교통망 프레임워크에 관한 연구
이정석 한국해양대학교 대학원 2023 국내박사
최근 세계적으로 해운 물동량의 증가와 선박의 거대화의 추세는 해사 산업 분야에 많은 변화를 가져오고 있다. 유럽 국가와 여러 선진 국가들의 경우에는 해상교통의 흐름을 보존하고 안전한 선박의 운항을 위해 최우선으로 항행구역을 고려하고 있다. 이러한 요구들은 여러 국가의 해양공간 계획에서 잘 구분되고 있으며 대용량의 해상교통 데이터와 최신 분석 방법을 활용하여 해상교통로 또는 해상교통망으로 분석하고 공공에 제공한다. 하지만 우리나라의 경우 최근 해상풍력발전단지의 육상입지 대체, 해양관광 활성화 등으로 연안해역을 운항하는 선박들의 관습적 해상교통 흐름에 변화를 유발하고 있지만, 해상교통 보존 연구는 미비한 상황이다. 이에 따라 선박들의 관습적인 통항로를 구축하여 해역이용 수요 증가 및 해상교통 여건의 악화에 대비한 해상교통로의 보존 및 관리 체계가 필요하다. 또한 항만과 항만을 아우르는 해상교통망을 구축하기 위해 해사 빅데이터, 인공지능, 공간분석 알고리즘을 활용하여 실제 선박에 적용이 가능할 방법을 고안할 필요성이 있다. 본 연구에서는 해사 빅데이터를 활용하여 다양한 데이터 분석에 사용하였다. 최근 해운산업에도 비정형, 정형 데이터를 수집하고 처리하는 기술이 발달하였고 선박 운항 기술에 데이터 분석 결과를 접목하는 다양한 연구가 진행되고 있다. 또한 AIS 데이터, 해양공간 정보, 전자해도 등 다양한 형태의 데이터를 해사 분야와 접목하여 안전한 선박 운항과 해양 환경 보호에 도움을 줄 수 있다. 한편 해사 산업에 데이터가 폭발적으로 증가하고 있어 이를 분석하기 위한 기술의 한 가지를 인공지능 알고리즘 개념에 통합하였다. 인공지능 알고리즘이란 대용량의 데이터를 활용하여 학습하고 인간의 의사결정을 모방하는 것을 목적으로 한다. 컴퓨터 기술의 발달에 따라 인공지능 알고리즘은 해양산업의 전통적인 운영 과정을 점진적으로 변화시키고 있다. 또한, 지리정보시스템을 활용하여 해사 공간 빅데이터를 효과적으로 분석하고 시각화 한다. 이러한 추세에 따라 해상교통로와 해상교통망을 구축할 수 있으며 실제 선박 운항에 적용 가능성이 존재하는 것을 의미한다. 본 연구의 구성인 해상교통로의 추출, 해상교통망 탐지, 지리정보 시스템의 네트워크 기반 항해계획 내용은 해사 빅데이터 활용, 인공지능 적용, 공간분석 알고리즘을 통합한 프레임워크를 기반으로 제안하였다.
High performance nanocarbon field emitter
By taking advantage of the superior material properties and high aspect ratio geometry of nanocarbon materials, many researchers have been able to devote their efforts toward the development of nanocarbon emitters, which are capable of providing low turn-on voltage, high emission current density and long-term emission stability. Electron beams of field emitter are widely employed in various applications, including X-ray photography and computed tomography (CT) scans in hospitals, fault detection of semiconductor devices, airport security, and terahertz generation. Moreover, electron beam generators are progressively becoming more miniaturized, light-weighted, and low-powered so that they can be applied to diverse areas. For a high performance field emitter, new concept of field emitter is needed to overcome the previous research. In this thesis, four novel approaches are developed in terms of fabricating the multidimensional field emitters. 1) CNT point emitter with graphene interfacial layer: we report graphene as an interfacial layer between the metal and CNTs to improve the interfacial contact. The interfacial graphene layer results in a dramatic decrease of the electrical contact resistance by an order of 2 and an increase of the interfacial thermal conductivity by 16%. Such a high improvement in the electrical and thermal interface leads to superior field emission performance with a very low turn-on field of 1.49 V μm−1 at 10 μA cm−2 and a threshold field of 2.00 V μm−1 at 10 mA cm−2, as well as the maximum current of 16 mA (current density of 2300 A cm−2). 2) CNT line emitter using clamping process: we report a robust and scalable method to fabricate high-performance carbon nanotube (CNT) line emitters by using a macroscopic mechanical clamping process. The process utilizes a handheld, metallic tongs (which also serves as an electrode for field emission) to pick up vertically aligned, super-grown CNTs from a substrate. By applying mechanical compression to a CNT forest in the uniaxial direction, the hemicylindrical shape of CNT structure strongly held with the tongs electrode is fabricated. With robust mechanical, thermal, and electrical contact characteristics created by mechanical clamping of CNTs, the CNT line emitter shows superior field emission performance with an emission current of 43 mA, a current density of 2700 mAcm-2, and stable operation over 10 hours. Furthermore, an extremely high emission current of 103 mA is achieved by clamping multiple CNT forests in a single tongs, showing prompt applicability of the present emitter for high-power electron beam sources. 3) Holey graphene film as a planar field emitter: we introduce an emitter in the shape of a hole, or hole emitter. An array of holes in graphene film can serve as a planar emitter, in which each circular hole is an emitter. Because of the nature of the sidewall emission through the edge of graphene film, the present planar emitter does not need any cumbersome process of leveling off emitter height and contriving to obtain the desirable inter-distance between emitters. Therefore, the screening effect and the field emission uniformity considered as obstacles in developing high efficiency planar emitters are easily resolved by an optimal design of the circular hole array. Moreover, the graphene film emitter is so flexible that it can be wrapped around a cylindrically shaped anode. This flexibility allows the present emitter to be used as a high power electron beam source because of the focusing of the emitted electron beams rendered by the concavely curved surface. 4) Carbonized cork emitter for multi-dimensional field emission: to broaden the range of application of electron beams, low power field emitters are needed that are miniature and light. We introduce here carbonized cork as a material for field emitters. The light natural cork becomes graphitic honeycomb upon carbonization, with the honeycomb cell walls 100-200 nm thick and the aspect ratio larger than 100, providing an ideal structure for the field electron emission. Compared to nanocarbon field emitters, the cork emitter produces a high current density and long-term stability with a low turn-on field. The nature of cork material makes it quite simple to fabricate the emitter. Furthermore, any desired shape of emitter tailored for the final application can easily be prepared for point, line, or planar emission.
이정석 충남대학교 산업대학원 2007 국내석사
In-Service Inspection is one of the most important processes to ensure the integrity of facilities of operational nuclear power plants. These inspection processes must comply with applicable codes, standards and regulatory requirements such as ASME Boiler and Pressure Vessel Code, Section XI, etc. Inspection plan must be established to identify examination areas, examination method, and examination schedule in accordance with those requirements. Examination must be implemented based on the approved examination plan and by qualified examiner using calibrated equipments as ASME Code. Indications detected as a result of examination must be evaluated for acceptance and indications exceeding allowable limits must be removed and/or corrected. Inspection processes generates a large amounts of examination report, evaluation report, etc., which must be controlled in an acceptable manner. The results of this study are as follows. 1. iSIMS can fulfil functionalities for planning of inspection, reporting of examination results, calibration of inspection equipments, management of resources including appropriate status reporting in communication with isometric drawings and 3 dimensional component layout models 2. This program can take advantage of information technology supporting inspection processes, archival of data generated and the fracture mechanics analysis of flaws detected during ISI. 3. Control of examination resources such as codes & standards, examination equipments and material, calibration blocks, examiners, procedures, references, etc. 4. Nuclear power plant is able to reduce the cost and establish systematic management through ISI database.
Objectives : The aims of this study was to find appropriate models to predict Body Image disturbance Severity with T-Score of SCL-90-R Subscales in a young Korean adults. Methods : Three hundreds and seventeen young healthy normal subjects ,who were university student, asked to fill out administered the Body Dysmorphic Disorder Examination-Self Report (Korean version of BDDE-SR ; K-BDDE-SR), Symptom checklist 90-Revision(Korean version of SCL 90-R). We calculated T-scores of SCL-90-R subscales standardized by sex and age. We log transformed K-BDDE-SR Total score with Natural logarithm. Stepwise multiple regression analysis was used. Dependent variable was log-transformed K-BDDE-SR and independent variables were T-scores of SCL-90-R subscales. We analysed data four times, for total subjects, male subjects, female subjects, and subjects who seem to have relatively severe body image disturbance, respectively. The statistics are carried out by SPSS 22.0. Results : Out of the 317 subjects, 123 were male and 194 were female. In analysis of total subjects, T-score of Interpersonal Sensitivity subscale was selected as statistically significant variable that increased log-transformed K-BDDE-SR total score. In analysis of male subjects, T-score of Depression subscale was selected as statistically significant variable and increased log-transformed K-BDDE-SR total score. In analysis of female subjects, T-scores of Interpersonal Sensitivity and Somatization subscales were selected as statistically significant and increased log-transformed K-BDDE-SR total score. In analysis of subjects having relatively severe body image disturbance, T-scores of Paranoid was selected as statistically significant and increasd log-tranformed K-BDDE-SR socres. Conclusions : Our study shows that increased T-score Interpersonal Sensitivity of SCL-90-R may be a risk factor of increased body image disturbance. But for male people increased depression subscale may be a risk factor and for female people increased Interpersonal Sensitivity and Somatization subscales may be risk factors. For people having relatively severe body image disturbance, increased paranoid subscale may be a risk factor. This result suggested that psychopathological mechanisms for increased body image disturbance may be different according to sex and severity of body image disturbance.