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기상 상태 변화에 따른 직육면체의 재질별 표면온도 변화 특성에 대한 실험 연구
김동건,최준혁,길태준,김정호,김태국,Kim, Dong-Geon,Choi, Jun-Hyuk,Kil, Tae-Jun,Kim, Jung-Ho,Kim, Tae-Kuk 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.2
The spectral radiance received by a remote sensor is consisted of the self-emitted component directly from the target surface, the reflected component of the solar irradiance at the target surface, and the scattered component by the atmosphere without ever reaching the object surface. In general, the self-emitted component is the most important part in the infrared signatures from the target. We measured the solar irradiation, sky irradiation, air temperature, wind velocity, wind direction, relative humidity, and atmospheric pressure together with the surface temperatures of rectangular parallelepiped targets. The measured diurnal surface temperature variations on the three different rectangular parallelepiped targets constructed by the steel, aluminum and bakelite are obtained at the same time intervals. The measured surface temperature results show that the top surface temperature of bakelite recorded up tp $7.6^{\circ}C$ higher than that of aluminium and $6.1^{\circ}C$ higher than that of steel at 11 AM on the sunny condition. A complete set of measured data including the surface temperature of rectangular parallelepiped targets together with the detailed weather information can be a valuable reference for future study.
아두이노를 이용한 위치정보 기반 안전한 자전거 애플리케이션
김동건,이호세,김소영,김태우,이형우,Kim, Dong-Gun,Lee, Ho-Se,Kim, So-Young,Kim, Tae-Woo,Lee, Hyung-Woo 한국사물인터넷학회 2016 한국사물인터넷학회 논문지 Vol.2 No.1
최근 자전거 이용자가 천만 명을 돌파하면서 자전거 라이딩은 일상생활의 요소로 자리 잡고 있다. 하지만, 이용자가 늘어날수록 사고의 위험에 무방비로 노출되면서 보다 안전하게 라이딩을 할 수 있는 예방 대책 수립이 절실하다. 이에 본 논문에서는 GPS 정보를 통하여 획득된 위치정보를 활용하여 사용자에게 주행 상황에 맞는 다양한 서비스를 제공할 수 있는 애플리케이션을 개발하였다. 이를 위해 안드로이드와 아두이노 기반 디바이스간 블루투스 송수신을 통해 자전거 전용 내비게이션 기능을 제공하여 안전성을 향상시킬 수 있었다. 향후 다양한 형태의 아두이노 센서로 확장할 경우 개인 맞춤형 모바일 IoT 서비스로 발전시킬 수 있을 것이라 기대한다. Bicycle users were surpassed a million recently as bicycle riding will be a key element of daily life. As users increase, we can expect that the user is more exposed to the risk of an unexpected accident. Therefore, we need to establish several preventive measures for a safe riding environment. In this paper, we developed mobile application by using the acquired GPS-based location information that provide safety services for the bike riding as a LBS service. In detail, we have been able to provide a bicycle safety navigation service by using the bluetooth transmission and reception method between Android and Arduino-based devices. As a future work, the safety could be improved if we expand various forms of Arduino sensors. As a result, a service developed in this study will be able to converge ahead to connect into several personalized mobile IoT services.
위성용 전개형 고안정 반사판 안테나 복합재 주반사판 설계 및 해석
김동건,구경래,김현국,송성찬,권성철,임재혁,김영배,Dong-Geon Kim,Kyung-Rae Koo,Hyun-Guk Kim,Sung-Chan Song,Seong-Cheol Kwon,Jae-Hyuk Lim,Young-Bae Kim 한국복합재료학회 2023 Composites research Vol.36 No.3
The deployable reflector antenna consists of 24 unit main reflectors, and is mounted on a launch vehicle in a folded state. This satellite reaches the operating orbit and the antenna of satellite is deployed, and performs a mission. The deployable reflector antenna has the advantage of reduce the storage volume of payload of launch vehicle, allowing large space structures to be mounted in the limited storage space of the launch vehicle. In this paper, structural analysis was performed on the main reflector constituting the deployable reflector antenna, and through this, the initial conceptual design was performed. Lightweight composite main reflector was designed by applying a carbon fiber composite and honeycomb core. The laminate pattern and shape were selected as design variables and a design that satisfies the operation conditions was derived. Then, the performance of the lightweight composite reflector antenna was analyzed by performing detailed structural analysis on modal analysis, quasi-static, thermal gradient, and dynamic behavior.
김동건,길경석,Kim, Dong-Geon,Kil, Gyung-Suk 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.9
This paper conducted a study on how the heat radiation of light emitting diode(LED) luminaires affects the indoor temperature increase. The effect was compared with that of a 20 W compact fluorescent lamp(CFL) and a 50 W MR16 halogen lamp which are most widely used inside of cruises, a LED downlight and a 4W MR16 LED replacing each of them. We installed a luminarie inside a thermally shielded chamber, measuring the temperature changes under the same volume every 5 minutes and compared the result with theoretically calculated heat radiation. The temperature changes in the chamber was measured four times, on seven hours' period in order to keep sufficient time once the temperature reaches the thermal equilibrium state. The results showed that the temperature of the 20 W E26 CFL and the 10 W LED downlight increased by $21.1^{\circ}C$ and $10.4^{\circ}C$ respectively, while that of the 50 W halogen MR16 and the 4 W LED MR16 increased by $33.9^{\circ}C$ and $4.8^{\circ}C$ respectively. The experimental heat radiation were calculated from the results and the experimental heat radiation of the CFL and the LED downlight were 171.5 cal and 86.5 cal, and those of the halogen MR16 and the LED MR16 were 275.3 cal and 36.5 cal. Therefore, the heat radiation was reduced by 49.5% and 86.7%, respectively, by replacing conventional light source with LED. In conclusion, we can expect a reduction of power consumption in air condition system and the effect on indoor temperature increase by application of LED luminaires.
IT기업의 학습지향성과 환경불확실성의 상호작용이 마케팅역량에 미치는 영향
김동건,신택현,Kim, Dong-Gun,Shin, Tack-Hyun 한국시뮬레이션학회 2016 한국시뮬레이션학회 논문지 Vol.25 No.3
본 연구는 우리나라 IT기업을 대상으로 환경불확실성과 학습지향성의 상호작용이 조직성과의 하나인 마케팅역량에 미치는 영향을 탐색적으로 살펴보고자 하였다. AMOS와 SPSS를 활용한 통계분석 결과, 직원수 500인 미만의 소규모 조직일수록 자신들이 직면한 환경불확실성에 보다 적극적으로 그리고 유연하게 대응하려는 경향이 농후했으며, 이 같은 환경에의 반응을 통해 마케팅역량의 증대라는 긍정적 성과를 가져왔다. 반면에 직원수 500인 이상인 기업의 경우는 그 어떤 유의한 상호작용효과도 보여주지 못했다. 이 같은 연구결과는 조직규모에 따른 경쟁 환경 및 시장지배력의 차이가 IT기업의 환경적응 메커니즘에서도 차이를 가져온 것이라는 추론을 가능케 한다. 다만, 이 같은 유추는 IT기업의 유형과 특성이 매우 이질적이라는 점에서 일정한 한계를 지닌다. 따라서 IT산업의 표본을 확장한 후속연구와 타산업과의 비교연구에 대한 필요성이 있다. This study intended to exploratively depict the influence of interaction between Environmental Uncertainty and Learning Orientation of Korean IT companies on Marketing Capability which was adopted as one of the organizational performance indicator. Statistical Results based on AMOS and SPSS showed that smaller-sized companies under 500 employees are more inclined to desperately and flexibly meet and adapt to their environmental uncertainty, resulting positive performance, that is, marketing capabilities. On the other hand, larger-sized companies over 500 employees showed no significant interaction effect. This result of the study induces the reasoning that the differences in competitive environment and market leadership accrued by organizational size may also incur differences in environmental adaptive mechanism. However, this reasoning can have some limitation in that the types and traits of IT firms are so different. Therefore, this topic suggests the necessity of follow-up researches using enlarged samples in IT industry and comparative studies in other industries.
A Rate Dependent Plasticity Model under Cyclic Loading of Metals
김동건,Kim, Dongkeon,Dargush, Gary F. Korean Society for Advanced Composite Structures 2013 복합신소재학회논문집 Vol.4 No.1
In real world applications, the response of structures may be dependent on the rate of loading and thus can be affected by transient loading, especially when the rate of loading is significant. In such situations, the rate of loading may become a major issue to understand structures during earthquake excitation or under blast or high velocity impact. In some cases, the rate effect on structures under strong earthquake excitation cannot be ignored when attempting to understand inelastic behavior of structures. Many researchers developed the constitutive theories in cyclic plasticity and viscoplasticity. In this study, numerical simulation by cyclic visocoplasticity models is introduced and analyzed. Finally, the analytical results are compared with experimental results as a means to evaluate and verify the model.