CoAP 기반 클라우드 환경 IoT 구조 설계 및 구현

박영기,양현식,김영한,Park, Young-Ki,Yang, Hyun-Sik,Kim, Young-Han 대한임베디드공학회 2015 대한임베디드공학회논문지 Vol.10 No.3

In the IoT(Internet of Things) environment, methods that user can access sensor node directly to collect sensing data or manage sensor in a gateway have a limitations. To solve this problem, cloud based sensor network architectures are proposed. In this paper, we proposed CoAP based IoT architecture that a lightweight gateway is used for data gathering instead of using a heavy traditional one and users can request sensing data through IoT applications running in the cloud environment and analyze signaling message cost. By doing so, our system can reduce message cost compared to the traditional gateway based system.

400 nm급 폴리에스터 해도형 초극세사 편성물의 감량 및 염색 특성

박영기,조아라,이정진,Park, Young Ki,Jo, A Ra,Lee, Jung Jin 한국섬유공학회 2015 한국섬유공학회지 Vol.52 No.5

The weight reduction and dyeing properties of circular-knitted fabrics, fabricated from sea-island-type polyethylene terephthalate (PET) ultramicrofiber with a single fiber that is approximately 400 nm in diameter, were investigated. It was found that the dissolution ratio was dependent on the process temperature and the concentration of the sodium hydroxide (NaOH) solution used during alkali treatment. The use of a penetrating agent reduced the dissolution rate when using a 1 wt% NaOH solution, but accelerated the dissolution when using a 2 wt% NaOH solution. The dissolution ratio reached its theoretical maximum when the fabric was treated at $95^{\circ}C$ for approximately 40-50 min with a 1 wt% NaOH solution and for approximately 15-20 min with a 2 wt% NaOH solution. Under these treatment conditions, a large number of the sea components were dissolved, although some island components were not separated even in the case of treatment at $95^{\circ}C$ for 50 min with a 1 wt% NaOH solution, as monitored by scanning electron microscopy (SEM). The use of a cationic dye staining method also allowed for observation of the dissolution behavior. The color yield of the disperse dye on the alkali-treated fabric was dependent on the dyeing temperature, and the K/S value decreased as the dyeing temperature increased from $110-130^{\circ}C$. The build-up property of the fabric was generally good, the wash fastness was very poor to poor, and the light fastness was poor to fair.

Vision Tracking을 이용한 주행 차량의 교통정보 산출 기법

박영기,임상일,조익현,차재상,Park, Young ki,Im, Sang il,Jo, Ik hyeon,Cha, Jae sang 한국ITS학회 2020 한국ITS학회논문지 Vol.19 No.5

Recently, for a smart city, there is a demand for a technology for acquiring traffic information using an intelligent road infrastructure and managing it. In the meantime, various technologies such as loop detectors, ultrasonic detectors, and image detectors have been used to analyze road traffic information but these have difficulty in collecting various informations, such as traffic density and length of a queue required for building a traffic information DB for moving vehicles. Therefore, in this paper, assuming a smart city built on the basis of a camera infrastructure such as intelligent CCTV on the road, a solution for calculating the traffic DB of moving vehicles using Vision Tracking of road CCTV cameras is presented. Simulation and verification of basic performance were conducted and solution can be usefully utilized in related fields as a new intelligent traffic DB calculation solution that reflects the environment of road-mounted CCTV cameras and moving vehicles in a variable smart city road environment. It is expected to be there. 최근 스마트시티 구축을 위하여 지능형 도로인프라를 이용한 차량의 교통정보를 취득하고, 이를 효율적으로 관리하기 위한 기술의 개발이 요구되고 있다. 그동안 도로의 교통정보를 분석하기 위해서는 루프 검지기, 초음파 검지기, 영상식 검지기 등의 다양한 기술들이 활용되고 있었다. 그런데, 이러한 종래의 기술들은 도로내에서 이동하는 차량을 대상으로 교통정보 DB 구축을 위해 필요한 교통 밀도, 대기행렬의 길이등 다양한 교통 DB의 수집에 어려움이 있었다. 따라서, 본 논문에서는 도로위에 지능형 CCTV등 카메라 인프라를 기본으로 구축되는 스마트 시티를 가정하여 도로의 CCTV카메라를 이용하여 도로 CCTV의 Vision Tracking을 이용한 주행차량의 교통DB산출하는 솔루션을 제시하고, 이에 대한 모의실험과 기초성능 검증을 행하였다. 본 논문에서 제시한 솔루션은 일반론으로 발전시켜야할 숙제는 여전히 남아있지만, 가변하는 스마트시티 도로환경속에서 도로부착형 CCTV카메라 이동차량 환경을 반영한 새로운 지능형 교통DB산출솔루션으로 관련 분야에서 유용하게 활용될수 있을것으로 기대된다.

'담장 허물기'에 따른 주거환경변화에 대한 거주자 의식 조사

나경욱(Na Kyoung-Wook),전명화(Jeon Myung-Hwa),정미렴(Jung Mi-Ryum),박영기(Park Young-Ki) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(계획계)

The purpose of this study is to survey about the changes of the resident's behavior and psychology after house's opening of fence project in Seoul. This research attempts to evaluate the people through a view of physical, psychological and social way. The method of evaluation used a field investigation, an interview and a checklist that was made from related references. The result of this study, the residential satisfaction has slightly improved after opening of fence. Especially the people could reduce the stress of parking. But the people have a serious anxiety that concerns with privacy and crime prevention because of the indefinite area. On the other hand, the change of the people's behavior and psychology about the area of defence has extended from their garden to neighbour and the street of the area.

복분자 딸기 열매의 품종별 기능성 성분 및 항산화 활성

박영기 ( Young Ki Park ),최선하 ( Sun Ha Choi ),김세현 ( Sea Hyun Kim ),장용석 ( Yong Seok Jang ),한진규 ( Jing Yu Han ),정헌관 ( Hun Gwan Chung ) 한국목재공학회 2008 목재공학 Vol.36 No.1

품종별에 따른 복분자 딸기 열매의 항산화 활성 및 기능성 성분 함량을 비교 분석하였다. 우수한 품종으로 개발한 정금 1, 2, 3, 4, 5호(10년생)와 도입종 블랙베리(Rubus fructicosus)를 사용하였다. DPPH법을 이용한 항산화 활성은 2 mg/㎖ 농도에서 46.58에서 78.55% 범위에 있었으며, 이 중 정금 1호의 항산화 활성이 우수하였다. 총 페놀 함량과 비타민 C 함량 및 안토시아닌 중 베리류의 대표성분인 cyanidin 3-glucoside의 함량을 측정한 결과 정금 1호가 다른 품종에 비해 우수한 결과를 나타내었다. To compare varietal differences in Rubus coreanus Miq. (Rosaceae), we evaluated antioxidant activity and the contents of functional substances. In this study, five new cultivars selected as superior berries in yield and weight of fruit, R. coreanus (Jungkeuam 1, 2, 3, 4, and 5), and one foreign berry, R. fructicosus were used. The contents of the major anthocyanin, cyanidin-3-glucoside(C3G) in berries and antioxidant capacity including, free radical scavenging activity and reducing power were measured. The contents of total phenol and vitamin C were also investigated. Among 5 cultivars and one foreign berry, Jungkeuam 1 had the richest C3G and high levels in vitamin C. DPPH radical scavenging activity of berries was ranged from 46.58 up to 78.55%.

프랜차이즈 커피전문점의 마케팅믹스활동이 소비자의 만족 및 행동의도에 미치는 영향

박영기(Park, Young-Ki),이상희(Lee, Sang-Hee) 한국호텔외식관광경영학회 2015 한국호텔외식경영학회 학술발표논문집 Vol.- No.-

The purpose of this study is to verify effects of customers" perceived marketing mix activities on customer satisfaction and behavioral intention to provide preliminary data for effective coffee house management. The questionnaire was distributed from March 2nd to 31st in 2015, of the 300 distributed questionnaire 264 copies were used in the analysis. To analyze the data, frequency, reliability, factor, pearson correlation, multiple regression were used with SPSS 18.0 program. The findings are as followed; First, it appeared that product(t=8.642, p=.000) and place(t=2.384, p=.000) showed a positive significant effect on customer satisfaction. Second, product(t=5.017, p=000), price(t=4.828, p=.000), promotion(t=2.473, p=.014) showed a positive significant effect on behavioral intention. Third, customer satisfaction(t=7.139, p=.000) showed a positive significant effect on behavioral intention. In this study, the quality of coffee is the most important factor in managing a successful coffee house. These results will help the manager and owner who managing the middle-scale franchised coffee house to the successful management. Limitations and future directions were also discussed.

휴대용 케이블 길이측정기 개발 및 활용방안에 대한 고찰

박영기(Young-ki Park),이상호(Sang-ho Lee),이경철(Kyung-cheol Lee),이대환(Dae-hwan Lee) 대한전기학회 2022 대한전기학회 학술대회 논문집 Vol.2022 No.7

배전선로 지중화 사업은 1988년 서울올림픽을 기점으로 서울과 대도시를 중심으로 급속하게 확대되었고 최근에는 신도시 등 대규모 택지개발에 지중케이블을 사용하고 있다. 지중케이블에서 고장이 발생하는 경우 고장점까지의 거리 측정이 필요하며 신설케이블은 정확한 케이블 거리를 알아야 자재산출과 잔자재 여입 등을 정확하게 처리할 수 있다. 그런데 아직까지 케이블의 거리를 측정하는 장비가 없는 실정으로 지중케이블의 거리 산출의 이론적 근거와 제품의 설계에 대하여 고찰해 보고자 한다.

현덕의 소년,소녀 소설 연구 -조선일보 발행『소년』수록 작품을 중심으로-

박영기 ( Young-ki Park ) 한국어린이문학교육학회 2016 어린이문학교육연구 Vol.17 No.2

현덕은 1930년대 후반, 잡지『소년』에 7편의 소년·소녀 소설을 발표했다. 현덕은 1930년대 식민지경성을 배경으로 도시에서 살아가는 소년·소녀의 고민과 갈등에 집중하고 이들의 내면을 생생하게 묘사함으로써 아동소설에 대한 애착을 드러냈다. 작품의 공간적 배경은 주로 거리, 전찻길, 백화점, 대합실, 병원, 극장, 우체국, 전당국 등으로 1930년대 경성의 도시적 공간이며, 식민지 근대화의 상징적 공간이다. 거리의 상점에는 공, 쌍안경, 스케이트, 만화책, 사진기계, 활동사진, 환등기가 쌓여 있다. 그러나 화려한 도시의 이면에는 일제의 합법적이고 제도적인 수탈 속에서 부모를 잃고 하층민으로 전락해가는 식민지 조선의 어린 소년·소녀들의 삶이 있었다. 현덕은 이러한 현실을 작품 속에 생생하게 담아내며 어린 ‘노마’의 뒤를 잇는 주인공 ‘기수’를 탄생시킨다. 기수는 ‘부권부재(父權不在)’의 불안한 시대적 상황에서 흔들리지 않는 내면성으로 자기만의 정체성을 지켜내며, 1930년대의 ‘동정(同情)’이라는 가치를 충실히 지켜낸다. 그러나 아직은 친구를 도와줄 능력이 없기 때문에 기수의 삼촌이나 형님이 등장하여 갑자기 모든 상황이 해결된다. 이러한 결말은 공동체 속에서 아버지의 대리자 역할을 수행하는 어른들의 인정과 도움으로 갈등이 해결되는 구조를 지닌다. 전통적으로 가난한 자에 대한 공동의 원조 의무를 지녔던 전통적 가치를 작품 속에 되살리는 것으로, 현실적으로 부재한 부권을 공동체성으로 복원해 내려는 의지의 표현이다. Hyeonduk published 7 teenage novels in the magazine『Sonyeon』in the late 1930s. Hyeonduk focused on the worries and conflicts of teenagers who lived in the colonial city, Kyeongseong in the 1930s. He expressed an attachment to children``s novels by vividly describing the inner side of teenagers. The novel``s spatial backgrounds are in Kyeonseong``s urban center in the 1930s including streets, tramlines, department stores, station waiting rooms, hospitals, theaters, post offices and pawn shops. Those places are symbolic place of colonial modernization. There are many balls, binoculars, skates, cartoons, cameras, motion pictures and slide projectors in the street shops. However, there are miserable Chosun teenagers living in the dark side of this fancy city. They lost their parents due to the colonial exploitation policy of Japanese imperialism and are degraded as people of low rank. Hyeonduk vividly included these realities in his novels and produced a hero, ‘Gisoo’ who succeeds ‘Noma’. Gisoo kept his own identity with unshakable determination during the unstable period when paternal authority was absent. And he preserved the value of sympathy during the 1930s. However, because he still does not have the ability to help his friends, Gisoo``s uncle and elder brother solved all the problems. It is an ending structure that adults`` sympathy and help solve conflicts. It was a trial in the novel to revive the traditional value of communal aid responsibility for the poor. It was also an expression of will to restore paternal authority though community spirit.

호안블럭의 수리학적 특성에 관한 연구

박영기 ( Park Young-ki ),이동주 ( Lee Dong-joo ),이장춘 ( Lee Jang-choon ),정재성 ( Jung Jae-sung ),홍응기 ( Hong Woong-gi ),박희열 ( Park Hee-youl ) 한국환경기술학회 2003 한국환경기술학회지 Vol.4 No.1

교육과정 중 현장실습이 진로결정과 취업의사에 미치는 영향 - 관광관련학과 학생을 중심으로 -

박영기 ( Park Young-ki ) 한국호텔리조트학회(구 한국호텔리조트카지노산학학회) 2016 호텔리조트연구 Vol.15 No.4

This study analyzed what factors had effected on career decision and job intention of tourism related department students through the field placement to entities among the curriculum of the college, and purposes to drag practical implications appeared from the field placement. As a result of the analysis; first of all, motivation factors like field adaptability and necessity of foreign language studies, welfares such as satisfaction of quality of food and uniform, field placement programs like orientation and systematic field placement programs, and satisfaction of the amount received after the field placement had effected on the career decision. Second, motivation factors like field duty capability improvement by the field placement and various work experiences, welfare, such as satisfaction of lunch time and cleanliness of the changing room, regular interview with a responsible person of the trainee and training programs, and relationship with colleagues like maintaining good relationship with employees and help of a manager had shown to have an influence on the job intention. Third, selecting a career, time to search career and an opportunity to decide career were appeared to have the effects of the factors of various employment information. Therefore, the career decision made by the field placement had appeared to have an influence to the job intention.