• 전기화학회지
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• 제6권3호
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• pp.203-207
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• 2003

아연공기전지는 공기중의 산소를 사용하므로 cathode의 재활용이 가능하다는 장점이 있으며 아연의 이론용량이 820(mAh/g)로 상당히 높다 또한 아연공기전지는 저율방전에서 방전말기까지 아주 평탄한 방전전압을 유지한다. 그러나, 고율방전에서는 방전전압이 낮아지고 에너지가 감소하며 cathode에 포함되어 있는 PTF도의 함량에 따라 저항 및 기공율에 많은 변화를 보이고 있다. 이에 본 연구에서는 전지의 에너지, 방전용량, 방전전압, DC저항, GSM, ASTM에 의한 기공율 측정을 통해 cathode내의 PTFE함량이 아연공기전지에 미치는 영향을 연구하였다. 그 결과 결합제의 함량이 감소할수록 전지의 특성이 향상되었으며 $15wt\%$일 때 가장 우수한 전지특성을 얻을 수 있었다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2008년도 춘계 학술발표회 제20권1호
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• pp.53-56
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• 2008

본 연구는 주거용 고층 건물에서 폭넓게 사용되고 있는 플랫 플레이트 구조에서 장방형 기둥-슬래브 접합부를 대상으로 실시한 6개의 실험결과를 분석한 것이다. 연구의 목적은 지진하중과 같이 반복적으로 작용하는 횡하중에 대하여 기둥 단면의 형상비(${\beta}$c=$c_1/c_2$)에 따른 접합부의 이력거동을 비교 평가 하는 것이다. 기둥 형상비는 $b_o$가 일정해 지도록 0.33${\sim}$3($c_1/c_2$=1/3, 1/1, 3/1)으로 선정하였다. 슬래브 휨철근비는 1.0%, 1.5%로 변화시켰으며, 중력전단력비($V_g/V_c$) 등 접합부의 이력거동에 영향을 줄 수 있는 다른 영향인자들은 일정한 조건으로 계획하여 기둥 형상비의 영향을 고찰할 수 있도록 하였다. 실험을 통해서 뚫림전단파괴 양상과 균열 패턴, 접합부의 강성, 변형능력 등을 변수에 따라 분석하였다.

• 복식
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• 제63권6호
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• pp.113-126
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• 2013

The purpose of this study is to analyze the current use of mannequins that are designed to display Hanbok and put forward suggestions for improvement. In order to carry out the study, an analysis on the mannequins that are currently in the market was conducted along with a survey with professionals who are in charge of the display. The significance of the study is that it has gathered the opinions of professionals who are currently participating in the displays of Hanbok to lay the foundation for improvements. As Hanbok is a flat-pattern costume unlike the Western ones, the most prominent way to display is to lay them on the floor or hang them on the wall. Nevertheless, the mannequin displays are needed to show the beauty of Hanbok as the silhouette can only be completed when it is put on a body. A new type of mannequins that can portray the distinctive features of Korean beauty more effectively need to be developed. Although the museum and enterprise slightly differ in their preferences and requirements for the mannequins, both agree on the following criteria; the shape should be adjusted: the protruding breasts of the mannequin are not suitable for Hanbok, the body should be disassembled: all parts of the body should be separable and it should be flexible at the joints so that it can produce various poses, the face should represent the "koreaness" and the material should be soft. Based on these findings, we put forth the suggestion that a more suitable mannequin should be developed to portray the beauty of Hanbok.

• 대한기계학회논문집B
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• 제34권12호
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• pp.1111-1119
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• 2010

본 연구에서는 내경 5.0mm 원관을 납작하게 한 납작관에 대하여 R-410A 를 사용하여 응축열전달 실험을 수행하였다. 실험은 포화온도와 열유속을 각각 $45^{\circ}C$ 와 10kW/$m^2$으로 고정한 상태에서 질량유속과 건도를 변화시키며 수행되었다. 실험결과 납작관의 종횡비가 열전달계수에 미치는 영향은 유동양식에 따라 달리 나타났다. 환상류에서는 종횡비가 증가할수록 증가하고 성층류에서는 종횡비가 증가할수록 감소하였다. 한편 납작관의 마찰손실은 종횡비가 증가할수록 증가하였다. 기존 상관식들은 납작관의 열전달계수와 마찰계수를 적절히 예측하였다.

• Journal of Biosystems Engineering
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• 제38권1호
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• pp.1-8
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• 2013

Purpose: Path planning and tracking algorithms applicable to various agricultural operations, such as tillage, planting, and spraying, are needed to generate steering angles for auto-guidance tractors to track a point ahead on the path. An optimal coverage path algorithm can enable a vehicle to effectively travel across a field by following a sequence of parallel paths with fixed spacing. This study proposes a path generation and tracking algorithm for an auto-guided Korean tractor with a tillage implement that generates a path with C-type turns and follows the generated path in a paddy field. A mathematical model was developed to generate a waypoint path for a tractor in a field. This waypoint path generation model was based on minimum tractor turning radius, waypoint intervals and LBOs (Limit of Boundary Offsets). At each location, the steering angle was calculated by comparing the waypoint angle and heading angle of the tractor. A path following program was developed with Labview-CVI to automatically read the waypoints and generate steering angles for the tractor to proceed to the next waypoint. A feasibility test of the developed program for real-time path tracking was performed with a mobile platform traveling on flat ground. The test results showed that the developed algorithm generated the desired path and steering angles with acceptable accuracy.

• 한국산학기술학회논문지
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• 제18권8호
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• pp.344-349
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• 2017

최근 전 세계적으로 고층건물의 외벽청소, 대형 구조물의 벽면검사, 조선에서의 벽면 용접 등 다양한 용도의 벽면이동 로봇들이 개발되고 있다. 기존에 개발된 벽면이동 로봇 중 바퀴형 이동로봇은 요철이 있는 벽면을 이동할 수 없다는 단점이 있으며 보행형 이동로봇은 복잡한 링크구조로 인해 많은 액추에이터가 필요로 하고, 더불어 제어가 복잡해지며 내구성의 문제가 발생한다. 또한 로봇의 무게가 무겁다는 단점이 있다. 본 논문에서는 이러한 단점을 극복하기 위해 간단한 구조를 가진 새로운 벽면이동 로봇을 제시한다. 본 논문의 벽면이동 로봇은 단 한 쌍의 축과 액추에이터를 이용하여 고릴라의 보행방식을 모사하여 이동하며, 진공펌프와 흡착패드를 이용하여 벽면에 진공 흡착한다. 본 논문에서 개발한 로봇의 구성요소로는 이동을 위한 DC모터, 흡착을 위한 진공펌프, 제어를 위한 마이크로 컨트롤러, 기타 동력전달과 형체 유지를 위한 축과 프레임이 있다. 로봇의 성능은 수직 및 수평에서 실험적으로 검증하였다. 본 논문에서 개발한 벽면이동 로봇을 기반으로 다양한 장치를 탑재한 산업현장, 재난재해 현장에서 다양한 기능을 수행하는 로봇의 개발이 가능할 것이라 전망한다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2013년도 제45회 하계 정기학술대회 초록집
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• pp.277.2-277.2
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• 2013

Petri dishes and glass slides have been widely used as general substrates for in vitro mammalian cell cultures due to their culture viability, optical transparency, experimental convenience, and relatively low cost. Despite the aforementioned benefit, however, the flat two-dimensional substrates exhibit limited capability in terms of realistically mimicking cellular polarization, intercellular interaction, and differentiation in the non-physiological culture environment. Here, we report a protocol of culturing embryonic rat hippocampal neurons on the electro-spun polymeric network and the results from examination of neuronal cell behavior and network formation on this culture platform. A combinatorial method of laser-scanning confocal fluorescence microscopy and live-cell imaging technique was employed to track axonal outgrowth and synaptic connectivity of the neuronal cells deposited on this model culture environment. The present microfiber-based scaffold supports the prolonged viability of three-dimensionally-formed neuronal networks and their microscopic geometric parameters (i.e., microfiber diameter) strongly influence the axonal outgrowth and synaptic connection pattern. These results implies that electro-spun fiber scaffolds with fine control over surface chemistry and nano/microscopic geometry may be used as an economic and general platform for three-dimensional mammalian culture systems, particularly, neuronal lineage and other network forming cell lines.

• 패션비즈니스
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• 제21권6호
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• pp.47-65
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• 2017

This study is intended to compare an actual wedding dress being made completely through 3D software, and compare it with an actual dress of a real model by using collective tools for comparative analysis. The method of the study was conducted via a literature review along with the production of the dresses. In the production, two wedding dresses for the small wedding ceremony were designed. Each of the design was made into both 3D and an actual garment. The results are as follows. First, the 3D whole body scanner reflects the measure of the exact human body size, however there were some difficulties in matching what the customer wanted, because the difference of the skin color and the hair style. Second, the pattern of the dress is much more easily altered than it was in the real production. Third, the silhouette of the virtual and the actual person with the dress was nearly the same. Fourth, textile tool was much more convenient because of the use of real-time rendering on the virtual dresses. Lastly, the lace and biz decoration were flat, and the luster was duller than in reality. Prospectively, the consumer will decide their own design of variety through the use of the avatar without wearing the actual dresses, and they would demand what the another one desired, different from the presented ones by making the corrections by themselves. Through this process, the consumer would be actively participating in the design, a step which would finally lead to the two way designing rather than the one way design of present times.

• 한국컴퓨터정보학회논문지
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• 제24권4호
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• pp.137-144
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• 2019

The purpose of this study was to provide basic data for the development of a prototype of a garment that allows middle aged men to look idealized by examining the type of perception of middle aged men based on their subjective evaluation and their characteristics. This study used the Q methodology, which is a subjective research method that finds correlations among middle aged men across subjective attributes. The types of perception of body shape of middle aged men were analyzed as three types: leaning forward shape with bird legs, developed upper body shape with thick legs, protruding abdomen obesity body shape. The leaning forward shape with bird legs was recognized as the lowest in the BMI index, and the shoulder and chest were sagging, legs were thinner than the body and leaned forward. And that the hip were protruding and had a flat rectangular shape. Developed upper body shape with thick legs was the second overweight type of BMI index. It was recognized that the ankle and calf thighs were thick and the upper abdomen protruded upper body development body. Protruding abdomen obesity body shape was the most obese type with BMI index. In this type, the height was the smallest, and the upper abdomen came out and the abdomen protruded, and the abdomen was more exuded than the chest, and the neck was thick and the hips were recognized as the big body. The middle aged men's recognitive body shape was classified as a similar to actual body shape. However, in the recognition type, the frontal and side body types were mixed and classified. It is necessary to study the ergonomic pattern considering the features of each body type. This suggests that psychological effects can be obtained that allow the body shape that changes with age to be accepted more positively.

• 식품보건융합연구
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• 제5권3호
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• pp.1-5
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• 2019

The field experiment was conducted in vegetable area, Institute of Horticultural Sciences in University of Agriculture, Faisalabad in order to recognize morphological and fruit growth pattern and yield of Tinda (Praecitrullus fistulosus) gourd germplasm lines. Sixteen germplasm lines in which one line is used as check are included were sown and grown on flat beds in field. The field experiment was arranged as randomized complete block design (RCBD) with three replications. Data on days to maturity, fruit per vine, fruit weight in grams, fruit diameter and total yield obtained were recorded. The fruit texture is marked as phenotype parameter. All parameters were collected and then analyzed statistically. All lines and replications showed different results among each other according to parameter. The maximum DTM (days to maturity), F/P (fruit per plant), FW (fruit weight), FD (fruit diameter) and Yield were recorded was $L_0$ (68.66), $L_3$ (1.66), $L_{10}$ (248.33), $L_{13}$ (8.50) and $L_0$ (599.33) and the minimum were recorded was $L_1$ (56), $L_{11}$ (0.33), $L_0$ (198), $L_9$ (7) and $L_4$ (421) grams respectively. All lines showed smooth texture of fruits with no hairs when mature at harvesting stage.