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박현준(HyunJun Park),탁원준(WonJun Tak),한범구(BumKu Han),곽동기(DongGi Kwag),황재혁(JaiHyuk Hwang),김병규(Byungkyu Kim) 한국항공우주학회 2009 韓國航空宇宙學會誌 Vol.37 No.5
본 논문에서는 위성 본체에 장착된 태양 전지 패널을 위성으로부터 분리하기 위한 새로운 개념의 비폭발식 분리 메커니즘을 제안하였으며, 구동기로서 형상기억합금을 이용한 스프링 형상의 구동기를 채택하였다. 먼저 제안된 분리 메커니즘을 구동하기 위해서 필요한 구동력을 측정하였으며, 구동하기에 적절한 구동기를 제작하기 위하여 이론적 계산을 통하여 스프링 형상의 형상기억합금 구동기를 설계/제작 하였다. 최종적으로 분리 메커니즘과 형상기억합금 구동기를 통합하고 분리 장치의 반응속도시험, 사전 하중(Preload) 시험, 충격시험을 통하여 검증하였다. 상기한 소형위성용 비폭발식 저충격 분리장치 개발을 통하여 그동안 사용되었던 선진국의 폭발식 분리장치를 대체할 수 있는 위성 부품의 국산화에 계기를 마련하고자 한다. This paper describes the development of non-explosive separation(NES) device which can be equipped on a small satellite. It comprises mechanism itself and spring-type shape memory alloy(SMA) actuator. In order to design SMA actuator properly, the necessary actuation force is measured. Based on that result, SMA actuator is designed and fabricated. Finally, SMA actuator and the proposed mechanism are integrated. In order to evaluate performance of the developed NES, we carried out a response time test, preload test and shock level test. In near future, we expect to replace the imported NES device with the developed device.
The Impact of Customer-Centric Strategy for Brand Creation
Hyunjun Park(박현준) 융복합지식학회 2018 융복합지식학회논문지 Vol.6 No.2
This research investigates how the brand of a company is vital for sustainability and growth. Typically, companies follow the market trend to produce products by analyzing the market only. However, this approach can have short-term profitability. On the other hand, the customer-centric strategy can create a brand where customers are aware and can trust a specific company because of their specific brand entity. Thus, this paper will focus on the customer needs as a priority instead of following the market trend. Moreover, it produces products that can benefit the customer instead of creating a better product to gain market share. Therefore, this research paper explored a cosmetic company called Pinkwonder which have successfully utilized and applied the customer-centric strategy from the beginning and created an organic cosmetic brand where the customers can trust. Currently, the organic cosmetic industry is trendy and attractive industry, especially in South Korea. Thus, there are many different competitors with various organic products to match and follow the current market trend. Therefore, these companies have followed the market trend and have obtained some of the market shares. This paper will explore the differences and importance in brand creation for growth and sustainability between the market trend follower versus customer centric-strategy. Also, it will attempt to discover that the customer-centric strategy may be more viable and sustainable in the long-term.
Social Media Influencer (SMI) Impact on Millennials
Hyunjun Park(박현준),Kyungmi Kim(김경미) 융복합지식학회 2018 융복합지식학회논문지 Vol.6 No.1
In this paper, we investigate how the company The Flying House Media have successfully strategically innovated by utilizing social media influencers (SMI) to have an impact on the new millennial generation. The cohort of millennial generations specific characteristics are based on discovering creative outlet, desire instant, and direct feedback. Therefore, this research has discovered that a new communication method of video content through social media from YouTube, Facebook, Twitter and more with an honest and meaningful story using SMIs has influenced the consumers successfully to purchase by exploring and examining the company The Flying House Media.
다리를 이용한 클램핑 방식의 자벌레 이동방식 대장내시경로봇
박현준(Park Hyunjun),임상혁(Leem Sanghyuck),김병규(Kim Byungkyu) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.6
본 논문은 자벌레 이동장치의 전, 후반부에 각각 여섯 개의 다리로 이루어진 고정장치를 사용하여 인체내에서 원활하게 이동할 수 있는 대장내시경로봇을 제안하였다. 또한, 관탐사용 이동장치로 기 개발된 하나의 공압선을 이용한 자벌레 이동방식을 적용하여 공압선과 이동환경 사이의 마찰을 줄여주어 이동 성능을 높여주었다. 이동 성능을 평가하기 위하여 로봇을 직경 15㎜, 길이 110~250㎜ 의 크기로 설계 및 제작 후, 아크릴 관과 죽은 돼지의 창자에서 이동실험을 수행하였다. 실험을 통하여 로봇은 곡관의 반경이 25㎜ 이상이면 이동이 가능함을 알 수 있었고, 직관의 경우 수평관에서 33㎜/s, 수직관에서 12.1㎜/s 의 이동 속도를 보여주었다. 결론적으로 하나의 공압선을 이용하여 구동되고 양단에 다리로 구성된 고정장치를 장착한 제안된 로봇은 대장내시경 로봇으로써 신뢰성이 높은 이동성능을 보여주었다. For the reliable clamping of a robotic colonoscope inside the colon, we propose a clamping module consisting of six legs at the front and a trigger at the rear. In addition, a pneumatic-line based locomotive mechanism, which was developed previously for in-pipe inspection, is adopted to reduce the friction force between the pneumatic lines and the locomotion environment. In order to evaluate locomotion performance, a robot with a diameter of 15 ㎜ and a length of 110?250 ㎜ is used. Based on control signal from LabVIEW, it is tested in acrylic pipe and pig’s colon. The proposed robot is able to move in the curved path which has a radius of over 25 ㎜. The speed of the robot is 33 ㎜/s in a straight path and 12.1 ㎜/s on a vertical path. The proposed robot, which has one pneumatic line and two clamping modules, conclusively shows reliable locomotion performance under in vitro condition.
RGO-키토산 복합체를 이용한 하이드로겔의 합성과 종이기반 이산화질소 검출 센싱 플랫폼 개발 응용
박현준(Hyunjun Park),김웅(Woong Kim),박주형(Joohyung Park),김우창(Woochang Kim),김민우(Minwoo Kim),김치현(Chihyun Kim),이원석(Wonseok Lee),박진성(Jinsung Park) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
In this study, we proposed that conductive composites like hydrogel using RGO and Chitosan. We are synthesized and detected a toxic gas, nitrogen dioxide (NO₂), using them. Heat the Graphene Oxide solution (GO) with ascorbic acid and reduced it to reduced graphene oxide(rGO). Then using acetic acid to make it acidic condition and add the chitosan powder to the rGO solution. When the chitosan powder is dissolved in acidic condition, it has the properties of gelation. The synthesized rGO gel has its own gel property, which is advantageous in creating and synthesizing structures by the desired mask. In particular, it has good adhesion with paper, so it can be used as a gas sensor to measure NO₂ by coating on paper. We confirmed that the detection result of NO₂ concentration range from 1 to 100 ppm. Conventional NO2 detection sensors have added nano conductive materials (nanowires, nanoparticles etc.) that increase conductivity to rGO, but the hydrogel condition has sufficient conductivity and advantage that can be manufactured from customizable sensors that are independent of shape.