• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2002년도 추계학술대회 논문집
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• pp.456-461
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• 2002

Nowadays, there are required more speed and accurate machining in order to improve the productivity through the reduction of cutting and non-cutting time. In this study, the high-speed HMC is specially designed to do remote control and high-speed mechanism with 30000rpm, 50000rpm, 40m/min, 100m/min and bridge type structure. Every structural deformation and vibration that is generated from all of factor is analyzed being based on the virtual manufacturing technologies: thermal characteristic analysis, machine-ability, tool wear measuring system, driving characteristic of linear motor and so on. As the application of these results had been consisted of three axes to move slight and rigid finally. Therefore, table errors that are resulted in change of work weight can be removed.

• 한국의류학회지
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• 제34권5호
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• pp.856-865
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• 2010

Many efforts to develop the domestic fashion industry have continued under the influence of a rapidly changing fashion industry environment. The fashion industry has emerged as a future growth industry leading lifestyle and as a core industry for the culture biz. Since the 2000's the markets that combined party and fashion wear as a new cultural trend has grown and an in-depth study of design development for party wear is required. This study presents basic materials for design development for the future domestic woman character casual brand prior to the design development by analyzing design characteristics of domestic female character casual brands. In the research methods, nine brands were selected based on the discussion of ten fashion specialists and then the brand concept, target, configuration of items, price, and design characteristics were analyzed. The following conclusions were drawn from this study. First, each brand concentrated the main focus on establishing a clear and unique brand identity that meets the needs of consumers to enhance competitiveness in the woman's dress market. To enhance competitiveness, many character casual brands targeting women aged 20's and 30's (including BEART) held party wear goods exhibitions as the market for party wear has increased significantly. Second, according to study results of the selected nine brand designs, it was found that the style characteristic of each brand varies depending on concept. However, all nine brand designs developed various styles such as feminine and cute style making use of laces, ruffles, A line silhouette, colorful motifs, and a stylish style that used layers with various materials along with unique decorations based on romantic emotions. Third, seven hundred and thirty eight pictures of nine brands were analyzed by items without identifying brands. According to the result of the analysis, the percentage of items used by brands was as follows: a one-piece dress was 34.5%, jacket 25.7%, skirt and pants 15.5%, blouse and shirt 13.6%, and tops 10.6%. The result showed that one-piece dresses accounted for the highest percentage. Frill accounted for 16.6%, the highest percentage followed by ribbons at 16% in regards to detail and trimming.

• 한국의류학회지
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• 제39권5호
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• pp.745-754
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• 2015

This study analyzed Korean middle-aged men's fashionable styles according to ageless trends as their representative characteristic and deriving their special features from men's magazines. Literature and case studies were conducted together. The research findings are as follows. First, it showed uniformity, conformity, passive clothing selection and consumption in 1990s as characteristics of middle-aged men's wear by period. However, clothing became an expressive way to pursue individuality and an ageless trend gradually, and middle-aged men positioned themselves as subjects of a consumer market for men's wear after 2010 through active clothing selection and consumption. Second, along with a trend change preferring a comfortable and active to formal atmosphere, it showed that casual style became diversified and segmented gradually in Korean middle-aged men's ageless trend and fashionable style. Third, as for formative characteristic changes in middle-aged men's fashionable style by period, it contained a slim silhouette, bright and splendid colors and patterns, increase of light, active and functional materials, generalization of casual items and pursuit of individuality by various mix & match styles. Fourth, in Korean men's ageless trend and changing fashionable style, four kinds of special characteristics were derived that included a change of the traditional clothing symbolism, weakened conformity & pursuit of personality, obscured boundaries between age and wearing style, and active embracing of a trend.

• 비파괴검사학회지
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• 제30권4호
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• pp.330-337
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• 2010

본 논문은 원전 증기발생기(SG, steam generator) 세관의 정밀 진단을 위한 차세대 탐촉자인 배열형 와전류 탐촉자의 특성 해석에 대한 3차원 전자기 수치해석을 수행하였다. 다양한 결함 해석을 위해 ASME(American Society of Mechanical Engineers) 표준시험편과 X-probe combo 표준보정시험편(inline EXP/spiral groove combo standard)을 선정하여 탐상신호를 획득하고, 실제 실험 신호와 비교하여 결과의 타당성을 검증하였다. 표준 보정 시험편의 해석 결과를 바탕으로 원전 SG 세관에서 주로 발생하고 있는 pitting, SCC(stress corrosion cracking), multiple SCC, wear 결함에 대하여 탐상신호를 획득하였다. 해석 대상으로는 원자력발전소 SG 세관으로 사용하고 있는 Inconel 600 도체관을 사용하였고, 이때의 시험주파수는 300 kHz이다. 본 논문을 통하여 각각의 결함에 대한 신호 특성을 파악하여 배열형 와전류 탐촉자의 결함의 종류에 따른 신호 특성을 확인할 수 있었다. 본 논문의 결과는 배열형 와전류 탐촉자의 와전류 탐상 신호 평가시 도움이 될 것이다.

• 한국의상디자인학회지
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• 제24권3호
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• pp.17-31
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• 2022

The purpose of this research is to suggest diverse directions for eco-friendly knit designing through analyzing the characteristics of Stella McCartney's knit designs. The first stage of the research was to explore the characteristics of eco-friendly fashion design based on literature review. The next stage was to categorize the characteristics of eco-friendly design found in Stella McCartney' knit fashion based on the precedent analysis. The data collected showed 274 examples from 40 Stella McCartney collections, including Spring, Resort, Pre-Fall, and Fall Ready-to-wear collections between 2013 and 2022. All information was collected using www.vogue.com. As a result, the characteristics of Stella McCartney's knit design were classified into four directopms: 1) Perpetual Naturalism, 2) Cultural Complexity, 3) Practical Functionality, and 4) Subcultural Reproducibility. The first characteristic, 'Perpetual Naturalism' values the continuous symbiosis between animals and human beings, thereby protecting global environmental value. Stella McCartney's knit design continuously showed a longing for nature's beauty through fashion design, which allowed people to enjoy the meaning of symbiosis between human beings and animals. Second, 'Cultural Complexity' is the characteristic that appears in Stella McCartney's knit fashion design when collaborating with various artists and/or mixing traditional knit motives inspired by traditional cultures and retro moods. Third, 'Practical Functionality' is the design characterisitic that allows items to be worn for a long time as it is comfortable, simple, and practical. Stella McCartney's knit designs pursue easy-to-wear designs that are comfortable and have practical designs with simple details. Lastly, 'Subcultural Reproducibility' showed in Stella McCartney's knit designs reflect Hippie culture, which pursued a rejection of conventional values, and promoted sustainable energy. This culture peaked in the 1960s and 1970s, when 'Beatles' were mainly working. Additionally, retro styled knit designs inspired by other various music genres from the 1980s and 1990s appeared in this category as well.

• 복식문화연구
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• 제16권5호
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• pp.937-954
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• 2008

The Gollyongpo was worn by the King and the Crown Prince in Joseon dynasty as an ordinary wear. The research on the Gollyongpo is focused on the historic record of Joseon dynasty, Joseonwangjosillok. This study will analyze literature, paintings and relics. First, I have researched Ming's(China) representative document daminghuidian, and excavated relics from the tomb dingling. I examined the usage and characteristic, through various remaining literature data, artifacts and paintings. The Gollyongpo was worn for the various ceremonies as well as an ordinary wear. According to the periode, the style and color had changed. The King wore the red Gollyongpo with 5 clawed dragon pattern, the Crown Prince wore black one with 4 clawed pattern, and the eldest son of the Crown Prince wore black one with 3 clawed dragon emblem. After the Daehan Empire, the Emperor wore gold outfit and the Crown Prince wore red outfit. Sonyongpo recorded in the Gungjungbalgi is concerned as Gollyongpo with narrow straight sleeve, one of the Sejong University Museum's Collection. There is some Possibility that the Gollyongpo painted in Bongsado is woven with dragon design, I would leave this matter for next research task.

• 한국정밀공학회지
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• 제23권1호
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• pp.64-71
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• 2006

Ultraprecision machining and MEMS technology have been taken more and more important position in machining of microparts. Micro endmilling is one of the prominent technology that has wide spectrum of application field ranging from macro parts to micro products. Also, the method of micro-grooving using micro endmill is used widely owing to many merit, but has problems of precision and quality of products due to tool wear and tool fracture. This investigation deals with state monitoring using acoustic emission(AE) signal in the micro-grooving. Characteristic evaluation of AE raw signal, AE hit and frequency analysis for condition monitoring is presented. Also, the feature extraction of AE signal directly related to machining process is executed. Then, the distinctive micro endmill state according to the each tool condition is classified by the fuzzy C-means algorithm.

• Tribology and Lubricants
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• 제27권3호
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• pp.134-139
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• 2011

The mechanical equipments which are exposed to impure environment undergo significant reductions in their own lifetimes. Several environmental test procedures have been developed to analyze these phenomena. Moreover in the industry to require shorter development duration, accelerated life testers artificially add test containments into machines. In this research JIS Z 8901 test powder was added into internal gear pumps which are used as oil pumps in vehicles and thus the effects of the addition on the degradation of the pumps were examined. Three kinds of contaminants were selected. Two of the contaminants are identical in particle size but different in the composition of the ingredients. The other pair have identical ingredients and composition but different particle size. The quantity of contaminants was also an interesting factor in this study. The results show that each JIS contaminant caused notable degradation in the discharge flow characteristic of pumps while friction torque degradation did not have any tendency. Finally leakage rates were deduced and equivalent wear volume ratios were calculated.

• 한국기계가공학회지
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• 제16권2호
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• pp.108-113
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• 2017

The performance of refrigerant oil at the thrust bearing and at the journal bearing of a scroll compressor is a significant factor. This paper presents the friction and anti-wear characteristics of nano-fluid with a mixture of a refrigerant oil and nano powders. The particle size distribution and oxidation stability of nano powders prepared by the electrical explosion method were analyzed by TEM and BET. It was found that the nanoparticles showed a spherical morphology with sizes ranging of 40-60 nm and were covered with graphite layers of 2-4 nm. The thermal conductivity of POE oil was 0.1-0.5W/mk higher than that of POE oil. The coefficient of friction of Cu-POE was found to be 0.1 higher than that of Al2O3. The cooling capacity of the heat pump with nanofluid increased to 3.67%, and the performance was improved by 5.83%.

• 한국분말재료학회지
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• 제20권4호
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• pp.291-296
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• 2013

SKD11 (ASTM D2) tool steel is a versatile high-carbon, high-chromium, air-hardening tool steel that is characterized by a relatively high attainable hardness and numerous, large, chromium rich alloy carbide in the microstructure. SKD11 tool steel provides an effective combination of wear resistance and toughness, tool performance, price, and a wide variety of product forms. The CNTs was good additives to improve the mechanical properties of metal. In this study, 1, 3 vol% CNTs was dispersed in SKD11 matrix by mechanical alloying. The SKD11+ CNT hybrid nanocomposites were investigated by FE-SEM, particle size distribution, hardness and wear resistance. The CNT was well dispersed in the SKD11 matrix and the mechanical properties of the composite were improved by CNTs addition. It shows good feasibility as cold work die tool.