기동헬기 생존장비 설계 및 입증

이병화,김성우,오우섭,구연덕,Lee, Byoung-Hwa,Kim, Sung-Woo,Oh, Woo Seop,Koo, Yeon-Deog 한국군사과학기술학회 2013 한국군사과학기술학회지 Vol.16 No.2

Visual information and aural warning of independent aircraft survivability equipment increase the pilot workload and limit the effective countermeasures. For increase the aircraft survivability, Integrated design of survivability display and aural warning need to consider pilot intuitions. If pilot aware the threat by intuition, evade or escape from the threat using the countermeasures equipment, it will increase the survivability. This paper describe the design and verification of for Utility Helicopter survivability equipment.

Localization Algorithm without Range Information in Wireless Sensor Networks

이병화,엄두섭,Lee, Byoung-Hwa,Lee, Woo-Yong,Eom, Doo-Seop 한국전기전자학회 2007 전기전자학회논문지 Vol.11 No.4

A sensor network is composed of a large number of sensor nodes that are densely deployed in a field. Each sensor performs a sensing task for detection specific events. After detecting this event, location information of the sensor node is very important. Range-based scheme of the proposed approaches typically achieve high accuracy on either node-to-node distances or angles, but this scheme have a drawback because all sensor nodes have the special hardware. On the other hand, range-free scheme provides economic advantage because of no needed hardware even if that leads to coarse positioning accuracy. In this paper, we propose a range-free localization algorithm without range information in wireless sensor networks. This is a range-free approach and uses a small number of anchor nodes and known sensor nodes. This paper develops a localization mechanism using the geometry conjecture (perpendicular bisector of a chord). The conjecture states that a perpendicular bisector of a chord passes through the center of the circle.

온라인 오픈마켓에 노출된 한(韓)스타일 한복상품 조사를 통한 마케팅 방향제시

이병화(Byoung-hwa Lee) 아시아민족조형학회 2011 아시아민족조형학보 Vol.9 No.1

The purpose of this research was to propose the direction of Hanbok-marketing and the focus through the trend of Han-styled Hanbok in on-line market. Research Methods was investigated Open-market, G-market, Auction, 11th-street and the investigation period has been from the April, 1st to the April, 10th, 2011. The results were as follows; 1. Han-styled Hanbok products have been available for customers with 175 webpages and 9,551 merchandises. 2. The Image classification result have had 5 sorts of images, that is, traditional hanbok, improvement hanbok, life hanbok, Fusion-hanbok, uniform. 3. The professionalism of business has been required by detailed items of Han-styled hanbok following T.P.O. Conclusion and Marketing focus; First, the marketing strategy available with the detailed classification of Han-styled hanbok product has been suitable for business own product images. Second, Find directions in the product competitiveness or the service marketing for the competitive edge have been necessary for multiple competition. Third, the brand-marketing informed of own brands or images has been available. Forth, as a sort of fashions, the Han-styled product"s era has arrived with available various marketings in fashion business.

선박엔진내 유동의 텀블 및 거동해석에 관한 연구

이병화(Byoung-hwa Lee),설동일(Dong-il Seol),장영준(Young-june Jang),전충환(Chung-hwan Jeon) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5

Many researches have been studied on in-cylinder flow as one of dominant effects for an engine combustion. Specially because the combustion flame speed is mainly determined by the turbulence at the end of compression process. Tumble and Turbulence ahead of combustion is very important phenomenon. As this phenomenon make research certainly, combustion condition will effectively be improve. This paper describes analytical results of the tumble flow, intensity, turbulence inside the cylinder of maritime engine. 3-D computation has been performed by using STAR-CD v3.26 solver and es-ice.

O2/N2 와 O2/CO2 분위기에서 석탄의 연소 및 질소산화물의 특성에 관한 연구

이병화(Byoung-hwa Lee),김성곤(Seong-gon Kim),이천성(Cheon-sung Lee),송주헌(Ju-hun Song),장영준(Young-june Chang),전충환(Chung-hwan Jeon) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.40

The characteristics of combustion and emissions from pulverized coals with O2/N2 and O2/CO2 environment at different O2 concentration (12, 21, 31%) were investigated in an drop tube furnace. Results showed that the char burning rate was faster as O2 concentration was higher and char burning rate with O2/CO2 was decreased those of O2/N2 due to the lower rate of oxygen diffusion into coal surface through the CO2 rich boundary layer. NO concentration increased with increasing O2 concentration, but declined at 31% O2 concentration. On the other hands, NO indexes decreased monotonically with increasing O2 concentration. This facts indicated that the reduction of NO was increased in higher O2 concentration due to formation of HCN. The NO concentration with O2/CO2 was lower than those of O2/N2 entirely due to enhancement of the NO reduction reaction with carbon monoxide. Almost no effect of temperature on NO emission at 1300℃.

실란커플링제 종류가 친수성 코팅 필름의 물성에 미치는 영향

이병화 ( Byoung-hwa Lee ),김은기 ( Eun-ki Kim ),이슬 ( Sul Lee ),임형준 ( Hyung-jun Lim ),이인표 ( In-pyo Lee ) 한국화학공학회 2016 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.54 No.2

고분자 필름의 친수성을 향상시키기 위하여 우수한 친수성을 보이는 코팅 용액을 졸-겔법으로 합성하였다. 코팅 용액은 입자 직경이 15 nm 크기의 콜로이드 실리카에 다양한 실란커플링제인 아미노실란, 에폭시실란과 아크릴실란을 각각 반응시켜 제조하였다. 콜로이드 실리카에 아미노실란을 첨가한 코팅 용액은 바로 겔화가 진행되어 코팅 용액을 제조할 수 없었다. 반면에 에폭시실란을 첨가한 코팅 용액은 실란커플링제/콜로이드 실리카의 질량분율(R값)이 0.10~0.15에서 접촉각 10~15°의 우수한 친수성을 나타내었다. 또한 아크릴실란을 첨가한 코팅 용액은 R값이 0.03~0.07에서 5~10°의 접촉각을 나타내어 아미노실란과 에폭시실란을 사용했을 때 보다 우수한 친수성을 나타내었다. In order to improve the hydrophilic property of polymer films, coating solutions which showed a good hydrophilic property, were prepared by the sol-gel method. The coating solutions were prepared by adding different types of silane coupling agents (aminosilane, epoxysilane and acrylsilane) to a colloidal silica (15 nm diameter). The solutions prepared by adding aminosilane resulted in gels which could not be used as coating solutions. On the other hand, the coating solutions prepared by the addition of epoxysilane showed contact angles of 10~15° and good hydrophilic property at R=0.10~0.15 (R=silane coupling agent/colloidal silica weight ratio). In addition, the coating solutions prepared by the addition of acrylsilane at R=0.03~0.07, exhibited contact angles of 5~10°, which means better hydrophilic property than aminosilane or epoxysilane.

센서 네트워크에서 모바일 앵커 노드(헬기)를 이용한 위치인식 알고리즘

이병화(Byoung-Hwa Lee) 한국항공우주학회 2011 韓國航空宇宙學會誌 Vol.39 No.8

센서 네트워크는 보통 넓은 지역에 조밀하게 센서 노드들이 분포되어 있는 형태로 구성된다. 이런 센서 노드들은 광활한 지역에 분포되는 관계로 초기에 헬기 등 기타 항공기를 이용해서 뿌려지는 것이 일반적이다. 각 센서 노드들은 특정 임무를 수행하며 획득된 정보를 자신의 위치 정보와 함께 최종 사용자에게 전달되는 형태로 운용된다. 여기서 노드들의 위치 정보가 필요하다. 본 논문은 센서 네트워크에서 헬기의 비콘 신호를 이용하여 센서 노드 사이의 거리정보를 필요로 하지 않는 알고리즘을 제안하였다. 센서 노도들은 위치를 계산하기 위해 헬기가 보내주는 주기적인 비콘 신호를 수신한다. 비콘 신호를 메모리에 저장하고 있다가 조건에 만족하는 다른 비콘 신호가 수신되면 이를 통해 자신의 위치를 추측한다. 이를 위해 본 논문에서는 기하학적 성질(현의 수직이동분)을 이용하였다. 기존에 존재하는 range-free 방식의 알고리즘과 비교 분석을 통해 제안하는 알고리즘의 정밀성을 입증하였다. Wireless Sensor Network is composed of a lot of sensor nodes that are densely deployed in a field. So generally this sensor nodes are spreaded using Helicopter or Fixed wing. Each node delivers own location and acquired information to user when it detects specific events. In this paper, we propose localization algorithm without range information in wireless sensor network using helicopter. Helicopter broadcasts periodically beacon signal for sensor nodes. Sensor nodes stored own memory this beacon signal until to find another beacon point(satisfied special condition). This paper develops a localization mechanism using the geometry conjecture(perpendicular bisector of a chord) to know own location. And the simulation results demonstrate that our localization scheme outperforms Centroid, APTT in terms of a higher location accuracy.

인터넷 쇼핑몰 환경에서 맞춤 한복상품 구매시스템 모형개발

이병화(Lee Byoung-Hwa) 한복문화학회 2011 韓服文化 Vol.14 No.3

The purpose of this study is a maximization of profits of purchaser and enterprise by developing the order made hanbck purchase system. In this study, 6 model compacted requests of purchaser have been offered by adding options on the basic model process of on-line purchase. As a result, model Ⅳ, Ⅴ, connected between virtual image present and pattern-CAD system, have been a high level of system required avatar, video animation and customers body image scan systems, though model Ⅰ, Ⅱ, Ⅲ have been easy way to realization by adding options. In conclusion, developed models present profits to both purchasers and salespersons. In other words, the purchaser can participate designing a hanbok expected to purchase in online and take the order made hanbok. On the other, the salesperson can utilize a purchasers data accumulated in DB and be relieved of a over-stocking by merchandising order production. Also, the order made hanbok will expand in on-line market based on models led to satisfactory purchase by compacting purchaser's request.

패션상품 창업 체험교육 프로세스에 관한 연구

이병화(Byoung-Hwa Lee) 한국의상디자인학회 2012 한국의상디자인학회지 Vol.14 No.3

전통 출생의류품 확산을 위한 DIY 상품 개발

이병화(Lee Byoung-Hwa) 한복문화학회 2017 韓服文化 Vol.20 No.1

The purpose of this study is to utilize and propagate the korean cultural heritage and to make jobs by developing DIY product. This study is limited to five items, which are a gangbo, a baenaet-jeogori, a dureongei, a tuckbaage and a sonssagea. Materials, which are white cottons; a gwangmock, an asa-myon, an ockyangmock or white cotton flannels, is basically used. To develope the product, it is cut out and divided to two sets by its size, which is the real size of a newborn baby or half size of it, broadening a customer"s choice. And it has been already cut out by its size and items to reduce its making time and record its making process. Therefore the pattern is not provided because of this simple process, which consist of only two steps, needlework(sewing) and ironing. In conclusion, the DIY package, traditional birth-clothes and developed as a prototype, was suggested as a practical marketing program and korean tradition culture will be rapidly spread and succeeded as a level of cultural heritage.