Welding is one of representative manufacturing processes in the industrial field. Cryogenic storage containers are also manufactured through welding, and conversion to laser welding is issue in the field due to many advantages. Since welding causes thermal-elastic deformation, design considering distortion is required. Prediction of distortion through FEM is essential, but laser welding has difficulties in the field because there is no representative heat source model. The author presented the model that can cover various models using a multi-layer heat source model in previous studies. However the previous study has a limitation which is a welding heat source model must be derived after performing bead on plate welding. Thus this study was attempted to estimate the welding heat source parameters by comparing the shape of bead under various conditions. First, the difference between penetration shape and welding heat source parameters according to welding power was analyzed. The radius of the welding heat source increased according to the welding power, and the depth of the welding heat source also increased. The correlation between the penetration shape and the welding heat source parameter appears at a similar rate, however the follow-up research is necessary with more model data.

Nanoporous silica aerogel insulation material is both lightweight and efficient; it has important value in the fields of aerospace, petrochemicals, electric metallurgy, shipbuilding, precision instruments, and so on. A theoretical calculation model and experimental measurement of equivalent thermal conductivity for nanoporous silica aerogel insulation material are introduced in this paper. The heat transfer characteristics and thermal insulation principle of aerogel nano are analyzed. The methods of SiO2 aerogel production are compared. The pressure range of SiO2 aerogel is 1Pa-atmospheric pressure; the temperature range is room temperature-900K. The pore diameter range of particle SiO2 aerogel is about 5 to 100 nm, and the average pore diameter range of about 20 ~ 40 nm. These results show that experimental measurements are in good agreement with theoretical calculation values. For nanoporous silica aerogel insulation material, the heat transfer calculation method suitable for nanotechnology can precisely calculate the equivalent thermal conductivity of aerogel nano insulation materials. The network structure is the reason why the thermal conductivity of the aerogel is very low. Heat transfer of materials is mainly realized by convection, radiation, and heat transfer. Therefore, the thermal conductivity of the heat transfer path in aerogel can be reduced by nanotechnology.

본 연구의 목적은 화산 활동 모형 만들기 실험에 대한 초등 교사들의 인식을 분석하는 것이다. 이에 ‘화산 활동 모형 만들기’ 실험으로 실제 수업을 진행한 경험이 있는 30명의 초등 교사들에게 설문을 통해 교사들이 생각하는 학교 과학 탐구의 목표를 바탕으로 해당 실험에 가진 장점과 개선점을 알아보았다. 결과에 의하면, 교사의 50-60%가 경력이나 근무 지역에 관계없이 교과서 화산 모형 만들기 실험으로 수업을 진행하였다. 교사들이 언급한 현재 교과서 화산 모형 만들기 실험의 장점은 안전하고 학생들의 창의성에 개발에 유용하다는 것이었다. 반면, 교사들은 현재 교과서 화산 모형 만들기 실험의 문제점으로 현재 교과서 화산 모형 만들기 실험은 이 수업이 추구해야 하는 본질과 괴리가 있으며 실제 화산 활동 모습과도 다르고 단순한 만들기 활동에 한정되고 있다는 점을 제시하였다. 탐구의 특성에 근거해서 분석해 본 교사가 생각하는 학교 과학 탐구의 주요 목표는 과학적 지식 적용, 탐구 능력 개발 및 학생 호기심 함양이었다. 이러한 목표에 비추어 볼 때 현재의 교과서 화산 모형 만들기 실험은 세 가지 모두를 충족하지 않고 있다. 그리고 교사들은 모형 실험은 실제성을 충족해야만 한다고 강조하였다.

Recent research has shown that many companies in the fashion industry are increasingly weaving close relationships with the art world, to appropriate art values and meanings to be associated with their own products and brands (Hagdtvedt & Patrick, 2008a; 2008b). Businesses related to the fashion luxury sector have been especially prone to using such strategies to transform their products into true artworks to address the issue of commodification resulting from high production volumes (Dion and Arnoult, 2011; Riot, Chameret & Rigaud, 2013). Over the past two decades, the luxury market has undergone huge structural changes through mergers and acquisitions that have transformed an industry made up of small, family businesses into major financial conglomerates and brand owners (Roux & Floch, 1996; Crane 2012). Secondly, globalization and openness to new fast-growing markets such as Asia, have led these luxury conglomerates to increase sales volumes, failing in one of the basic characteristics of such goods: rarity. But if the real rarity of luxury products is a promise that companies can no longer guarantee their own consumers, the elitism of these products can be ensured through an artificial rarity. Jean-Noël Kapferer used the neologism artification recently introduced by French sociologists Nathalie Heinich and Roberta Shapiro and applied it to the analysis of luxury goods (Kapferer, 2012; 2014; Heinich and Shapiro, 2012; Shapiro and Heinich, 2012). He stressed that a strategy based on art implemented by luxury companies is useful mainly to support the perception of rarity by the final consumer. Artification is based on the notion that art –related objects or persons are associated with positive values. Enhancing a corporate image in the consumer’s mind means building positive ties to the brand that will initiate a form of benevolence towards the brand, providing the legitimization of corporate actions and, in some cases, resulting in the purchase of goods and services produced and distributed by the company (Keller, 1993; Aaker, 1996; Aaker & Joachimsthaler, 2000; Keller, 2003). We decided to analyse the effect of Artification on brand value by focusing on the four dimensions of Awareness, Image, Quality and Loyalty by using the same CbBE ( Customer-based Brand Equity) structure previous authors tested on country of origin effect on consumers, based on the main hypotheses further explained (Pappu, Quester & Cooksey, 2006). The first hypothesis relates to the dimension of Awareness and aims to test the level of brand recognition in final consumers when the logo is modified by an artist. • H1 – Consumers’ awareness remains strong when the brand is ‘artified’. We analyze then the Image, as the second dimension of CbBE. Due to the complexity of this dimension, we posited two hypotheses connected to it: • H2a – Consumers’ free associations to the brand are connected to the artworld when the brand is ‘artified’ (e.g. consumers indicate words as art, contemporary art or the name of the artist). • H2b – Consumers’ evaluation of the brand image points to stronger positive associations when the brand is ‘artified’ The last two hypotheses we mention are connected to the dimensions of Quality and Loyalty: • H3 – Consumers’ evaluation of Quality increases when the brand is ‘artified’.  H4 – Consumers’ Loyalty to the brand increases when the brand is ‘artified’. • The analysis was conducted through a between-subjects randomized experiment and manipulated art presence (with art versus without art). Starting from the same panel, two groups were created: one including the treatment (visual arts) and one including no treatment at all. Furthermore, we limited ourselves in this experiment to images of products and pattern created by Louis Vuitton that are actually on the market, associating them randomly to the research units in order to obtain two statistically consistent groups subjected to the different treatment (with art or without art)4. The two groups were labelled ‘artified’ group and control group, the first grouping the respondents to the questionnaire containing images of Louis Vuitton Logo, pattern and product modified by art collaboration with Yayoi Kusama; and the second grouping the respondents to the questionnaire containing images of Louis Vuitton Logo, pattern and product in its standard design. The questionnaire was distributed between the months of May and June 2015 via Qualtrics survey software. It was divided into four distinct blocks: the first concerned the presentation of the survey, the declaration of authorization signed by the participants and the demographic information; the second and the third blocks of questions were identical, with the same series of questions but based on different images used. There were 880 respondents, 825 of whom correctly filled the questionnaire we submitted to them. The control group was made of 413 respondents, 73.13 % of whom were female and 26.87 % male. The ‘artified’ group was made of 71.60 % female and 28.40 % male. We analyzed the four dimensions of Awareness, Image, Quality and Loyalty individually and in a comparative manner between the control and ‘artified’ groups. In the CbBE model, dimensions are analyzed individually since Awareness and brand Image measures are not comparable because they are collected through different measure methods, respectively through multiple choice and open-ended questions. Such dimensions as Image, Quality and Loyalty which were raised through Likert scales were then subjected to mono multivariate statistical analysis. The main results are shown in table 1. By reading the results for CbBE, Hypothesis H1 [Consumers’ awareness remain strong when the brand is ‘artified’] has been confirmed. The aided brand awareness shows no important differences between the two groups, so visual artists may modify logos or the appearance of luxury products without the fear of compromising brand awareness in the final consumers. Hypothesis H2a [Consumers’ free associations to the brand are connected to the arts when the brand is ‘artified’ (e.g. the word art, contemporary art or the name of the artist)] was not confirmed. Hypothesis H2b was partially confirmed as Generic Associations and Brand Personality were impacted by the use of the visual arts, while Organizational Associations were not. Brand loyalty and Perceived Quality were not impacted by the Visual Arts either, so Hypothesis H3 and H4 were not confirmed. As a main result for CbBE analysis, the Visual Arts have an impact on Customer-based Brand Equity, limited to Brand Image dimensions. The fact that Brand Image is one of the most complex dimensions of brand value opens the way to the development of future analysis and research in the visual arts as external source for brand equity, especially for Brand Personality. The main results of our research show that an artification effect is visible especially at the level of brand image and brand personality, two complex and valuable components of Brand Value from a consumer perspective. This opens to further in-depth analysis of these two components for future research. Large luxury groups (such as Cartier and Prada) have long used an art-based strategy to increase the value of their products, avoiding the risk of a loss of prestige perceived by the final consumer who would no longer recognize the exclusivity of a product that seems to be increasingly more industrial than handmade. Art can therefore contribute to alter and rework the image and market position of a specific brand or an entire product line, ensuring the transition from an ordinary image to a prestigious one, or strengthening the existing prestigious perception (Hetsroni & Tukachinsky, 2005; Lee et Al., 2015). We believe that a strategy based on art implemented by luxury companies is beneficial mainly to support the perception of rarity by the final consumer. Luxury goods would have to be unique or at least not produced in too high volumes precisely because of their craftsmanship and the care with which they are made. Rarity is not compatible with the increase in sales volumes required by the financial holdings that own the same luxury brands (Roux and Lipovetsky, 2003; Kapferer, 2012; 2014; 2015). The artification process we researched would have exactly the dual purpose of improving the brand image of companies that apply it, while increasing the perception of luxury in end consumers. What is more, we believe that the luxury brands from the industry sector that belong to large financial conglomerates now have the strength to simultaneously apply all the components in the artification process, by sustaining activities of sponsorship, philanthropy or generic collaboration with artists. The fact that luxury products are an integral part of the world of visual arts combined with the fact luxury brands have now the strong support base of large financial conglomerates can ensure the right economic and cultural support needed for the application of such a strategy. In the case of fashion companies, we believe artification is a process in itinere. In our experiment free associations to the brand show that only 2 consumers out of 880 remembered or knew the name of the artist (Yayoi Kusama) and 10 people indicated the substantive ‘art’ or ‘contemporary arts’ as free associations in the ‘artified group’ (only 2 in the control group). This shows that luxury brands ‘art-based strategy cannot only concentrate on temporary collaborations with artists. Luxury brands as Louis Vuitton must act as art institutions able to display arts collections to the widest public and bestow art status and global recognition to collaborating artists (Masè and Cedrola, 2017). This strategy relies on LV ability to raise consumers’ awareness of the arts. While the art-oriented public recognizes artistic collaborations, the larger public does not yet is still very much aware of new designs. Novelty is equally perceived by both, but is partially decoded by one category of consumers.

구조실험을 위한 데이터 모델은 구조실험에 관련된 실험정보를 정형화하여 표현하므로 데이터 저장소를 개발하는데 이용할 수 있다. 데이터 모델은 특히 대규모의 구조실험정보 또는 일반적인 다양한 실험정보를 위한 데이터 저장소에 효과적인데 예를 들면 NEES에서 개발한 NEEShub Project Warehouse가 있다. 본 논문은 데이터 모델의 구성과 사용을 평가하기 위한 평가요소를 제안하고 있다. 클래스의 속성이 값을 갖는지를 의미하는 AVE(attribute value existence)란 용어를 도입하여 속성의 사용성에 대한 Attribute AVE, 클래스의 사용성에 대한 Class AVE, 하위레벨에 있는 클래스를 포함하는 Class Level AVE, 하나의 프로젝트의 모든 클래스를 포함하는 Project AVE, 모든 프로젝트를 포함하는 데이터 모델에 대한 Data Model AVE를 정의하였다. 이러한 평가요소들을 NEES 데이터 모델의 프로젝트들에 적용하였는데 데이터 모델내의 클래스와 객체에 대한 사용성을 수치적으로 기술하여 평가하는 것이 가능하였다.

스파이럴 기초를 국내 온실 기초로 사용한 사례는 거의 없으며 일본에서 스파이럴을 온실 기초로 사용한 사례가 있다. 현재 국내에서는 스파이럴 기초가 다른 분야에서 연약지반 보강 기초로 많이 사용되고 있어, 앞으로 온실기초의 보강을 위한 기초로 활용 가능할 것으로 기대된다. 본 연구에서는 스파이럴 기초의 기초 설계 자료를 제공할 목적으로 모형실험을 통해 기초의 매립깊이, 흙의 다짐률, 스파이럴 직경, 흙에 따른 인발하중 측정결 과를 비교분석하여 다음과 같은 결론을 얻을 수 있었다. 농경지 및 간척지 흙의 극한 인발저항력 비교결과 농경지 흙이 간척치 흙보다 상대적으로 1.2~3.0배 더 큰 값을 나타냈다. 또한 두 흙 모두 매립깊이, 다짐률이 증가할수록 극한 인발저항력은 증가하는 경향을 관찰할 수 있었고, 모두 비슷한 하중-변위 곡선을 보였다. 실험조건에 따른 극한 인발저항력은 매립깊이 증가에 따른 인발 하중 상승효과 보다 직경 크기 증가에 따른 상승효과가 더 크게 나타났다. 그리고 다짐률 증가에 따른 극한 인발저항력은 다른 조건들에 비해서 증가 폭이 상당히 큰 경향을 보였다. 따라서 일반적인 농경지뿐만 아니라 간척지와 같이 연약지반에 스파이럴 기초를 설치할 경우에도 기초의 매립깊이, 다짐율, 스파이럴 직경 등을 증가 시키면 인발저항력이 높아져 연약지반 보강 기초로 사용 가능 할 것으로 판단된다.

Acoustic target strength (TS) measurement and theoretical acoustic scattering models were applied to estimate the TS for assessing the fish biomass. TS measurement was made of ex situ sailfin sandfish Arctoscopus japonicus at 70 and 120 kHz, and then compared to backscatter model prediction. The live sandfish was tethered in seawater using monofilament lines. Measurements were made versus incidence angle, −50° to 50° relative to dorsal aspect directions. Distorted wave Born approximation (DWBA) model was used to calculated TS pattern. The TS values of sandfish (body length: 16.2 cm) at 70 and 120 kHz were ‒66.94 dB and ‒64.45 dB, respectively, and were about 20 dB lower than TS of other fishes in Korea waters. These TS levels were distributed within the range of the theoretical TS. Ex situ measurement and theoretical TS may be applied to improve acoustical detection and biomass estimation of the sandfish, and is necessary to measure with various lengths.

2013년 여름철 집중관측기간(장마기간: 2013년 6월 20일-7월 7일, 집중호우기간: 2013년 7월 8일-30일) 동안 이동식 기상관측시스템의 레윈존데 관측 자료를 전 지구 통합예측시스템 3차원 자료동화에 이용하여 그 효과를 살펴보았다. 효과 분석을 위한 2가지 모의실험 중 규준실험은 기존 기상청 관측 자료만 사용한 것이고 관측시스템실험은 기상청 관측 자료에 이동식 기상관측시스템의 레윈존데 자료를 추가한 것이다. 장마기간 동안 두 실험의 500 hPa 지위고도, 850 hPa 기온, 300 hPa 풍속의 관측 및 분석검증 비교 결과 큰 차이를 보이지 않았는데, 이는 고정관측소의 레윈존데 자료(0000 UTC 및 1200 UTC)만을 기준으로 검증이 이루어졌기 때문이다. 하지만, 종관기상관측시스템의 시간별 누적 강수량 자료를 이용한 강수검증에 있어서 관측시스템실험의 평균 공정임계지수가 규준실험에 비해 2% 수준으로 개선된 결과를 보였다. 특히 강수검증에서 긍정적인 효과가 나타난 사례만 비교한 경우, 관측시스템실험의 평균 공정임계지수가 규준실험에 비해 41%까지 개선된 결과를 보여 이동식 기상관측시스템 레윈존데 관측 자료가 수치모델의 예측정확도 향상에 유용함을 알 수 있었다.

The OGS model is configured and used for simulation of the LASGIT project. The modeling conditions and the simulation results from the previous work by Walsh and Calder (2009) are analyzed to see if the simulation configuration is done correctly and to apply for the LASGIT project. Except for the unrealistic modeling conditions used previously, the simulation results successfully demonstrated helium propagation that is typical for the two-phase flow. The results indicated that the relations of capillary pressure and the relative permeability against water saturation used previously should be updated. An elaborated simulation with more realistic parameters should be used to improve the weak points of preliminary work.

본 연구는 미리 지정된 항로를 따라 항해하기 위한 선박의 Track-keeping에 대한 기초 실험 연구 분석결과를 제시하였다. 항로상에 위치한 여러 가지 변침점을 설정하고, 해당 선박이 그 항로를 항해하도록 알고리즘을 구성, 모형선을 이용한 실험 결과를 보여주었다. 지정된 구역에서 GPS로 변침점을 설정하고, 그 포인트를 Data화하여, 미리 프로그램된 알고리즘에 입력하면 해당 선박이 자동으로 항로를 항해하도록 설계되었다. PD 제어를 이용하여 침로 유지 알고리즘을 구성하였고, 선박 자동 Track-keeping 결과는 모니터링 가능토록 하였고, 변수를 설정 변경하도록 설계되었다. 제시된 알고리즘은 실험을 통하여 그 알고리즘의 효용성을 확인할 수 있었으며, 실선의 항해 자동화 및 충돌회피, 자동접안 등의 다양한 분야에 응용될 수 있을 것으로 판단된다.

This research presents an analysis of algorithm for ship track-keeping along a given trajectory. For the track-keeping problem , the m aneuver of w ay-point ship guiding through a sim ple path are presented. In order to solve the problem above, a desired trajectory is usually determ ined by G PS points in a pre-fixed place then these points are set in a pre-program m ed navigation that the ship w ill be autom atically tracked. Proportional-D erivative (PD ) control is useful for fast response controllers w ill be used in this program and the results of ship auto track-keeping experim ents will be explained in order to illustrate the adjustm ent in controlling param eters. These results can be utilized as a step to carry out the experim ent of ship collision avoidance system and autom atic berthing in the future.

This study proposes the generation mechanism of various design matrix using generalized linear model for design of experiment. Design generation method of GLM analysis, factorial design(FD) with center points, ANOVA design with lack-of-fit test, and response surface design are introduced. In central composite(CC) design, orthogonal blocking and fractional factorial design(FFD) are presented. We compare the design of Box-Benhken(BB) and face-centred central compsite design.

A model experiment, simulation test using personal computer and real sea trial fishing were carried out to investigate the basic efficiency of bottom trawl net which can be used in the sea mount of North West Pacific, and experimental values were analyzed as the values of full-scale bottom trawl net. Hydrodynamic resistance for the full-scale trawl net according to the Koyama equation was 2.1 times higher than that of simulation and 2.4 times higher than that of model experiment at the average towing velocity. At the 3.5kt's of towing speed, net width of the full-scale trawl net was 2.5% smaller than that of simulation and 8.2% larger than that of model experiment. On the fishing experiment of the full-scale trawl net for the 3.5kt's of average towing speed, average net height of A group(same direction with external force) was 423.5% higher than that of model experiment and 457.1% higher than that of simulation and that of B group(opposite direction with external force) were 283.8% and 306.3% higher than in case of model experiment and Simulation respectively. Net mouth of the full-scale trawl net was 338.1-504.6% higher than those of model experiment and simulation in A group, and 525.2-745.3% higher in B group.

A model experiment using circulation water channel was carried out to investigate the dynamic characteristics of bottom trawl net which can be used in sea mount of North Pacific. Hydrodynamic resistance and shape variation according to the flow velocity and angle of hand rope transformation for net were measured, and experimental value was analyzed as the value of full-scale bottom trawl net. The results summarized are as follows; At the 30˚ of angle of hand rope to net, hydrodynamic resistance varied from 0.5kgf to 2.68kgf as the flow velocity increased between 0.31m/s and 0.92m/s, and formula of hydrodynamic resistance for the model net was Fm=3.04 · r1.53. At the fixed angle of hand rope, Net height was low and Net width was high according to the increase of flow velocity, and in addition, vertical opening was low and Net width was high by the increase of angle of hand rope at the fixed flow velocity. At the 30˚ of angle of hand rope to net, net opening area was 0.214m2 as flow velocity was 0.61m/s, and formula of net opening area for the model net was Sm=-0.22r+0.35. At the 30˚ of angle of hand rope to net, catch efficiency seemed to be highest as 0.319m3/s of filtering volume at the 0.76m/s(51kt's) of flow velocity. Shape variation of net showed the gradual laminar transform for the variation of flow velocity but there needed some improvements due to the occurrence of shortening at the ahead of wing net.

남해안에서 정치망 어구의 고정용으로 사용되고 있는 닻가지(fluke)가 하나인 스톡형닻(A형), 닻가지 2개가 한 방향으로 달려 있는 스톡형닻(B형), 닻가지 2개가 좌우로 달려 있는 스톡형닻(C형) 세가지의 모형을 제작하여 들의 종류(펄, 모래, 모래펄)와 닻줄의 길이(수심의 2배, 2.5배, 3배, 3.5배, 4배)에 따른 모형별 장력, 파주력, 파주력계수를 비교 분석하였다. 모형실험의 결과를 요약하면 다음과 같다. 1. 장력과 파주력은 저질별로는 펄에서 가장 크고, 모래펄, 모래 순으로 작아진다. 닻줄의 길이에 따라서는 닻줄이 길어질수록 장력과 파주력이 커지는 현상을 보였고, 닻의 종류별로는 B형이 가장 크고, A형, C형의 순으로 나타났다. 2. 닻가지의 단위면책당 파주력은 닻줄이 짧을 때는 A형이 가장 크고, 길 때는 A형과 B형이 거의 비슷하며, C형은 모든 길이에서 A형과 B형에 비하여 거의 절반 수준이었다. 3. 파주력계수는 펄에서 가장 크고, 모래펄, 모래 순이며, 닻의 종류별로는 A형이 가장 크고, B형, C형의 순으로 나타났다. 4. 정치망 고정용 닻의 성능은 조류방향이 항상 일정한 어장에서는 A형이 우수하며, 이상조류가 발생하는 어장에서는 B형이 어구의 안정적인 고정을 위하여 우수할 것으로 판단된다.