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Study on thermal behavior of a cuboid on reflecting platforms under transient weather conditions
길태준,한국일,김태국 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.5
The purpose of this study is validating the factors which affect the surface temperature of a cuboid under transient solar irradiance. Thesurface temperature is determined by considering the material property and weather conditions including the solar irradiance which playsa major role in thermal signature profile in clear daytime. This study focuses on verifying the unsteady temperature prediction result obtainedfrom a SW developed in this study by comparing with those results obtained from a commercial SW and measurement. In thispaper, a cuboid on reflecting platforms with different surface reflectivity is used for verifying the measured and calculated temperaturesby considering a diurnal variation of climatic changes. The developed SW predicts the surface temperature of the cuboid considering thereal-time weather data from measurements. From this study it is observed that the developed SW is compared fairly well with the commercialSW RadThermIR, and the developed SW shoes better agreements with the measured data as compared to the RadThermIR data. We also found that the use of proper radiative surface properties is very important to obtain more accurate modeled results especially forhighly reflecting system with solar irradiation.
기업 도태현상(Shakeout)속에서의 적응전략과 선택 메커니즘: 미국 자동차 시장을 대상으로
길태준,이정동,백철우 한국혁신학회 2017 한국혁신학회지 Vol.12 No.1
There are many Shakeout phenomena in which the number of entrants in a newly created industry reaches a certain point, and the total number of companies suddenly decreases. On the other hand, according to the view of selection and adaptation of the evolutionary economics, the firm is an active entity that can be selected by the environment but can adapt to the market environment through adaptation efforts. The purpose of this study is to apply the concepts of adaptation and selection of evolutionary economics to product level analysis and expand it to the discussion of industry level as Shakeout. For this purpose, the US automobile market in 1905-1942 was divided into the Shakeout period and pre and post Shakeout period, and the adaptation strategy and the selection mechanism were analyzed using the Cox risk proportional model. As a result of the analysis, it was confirmed that product differentiation strategy in the Shakeout period enhances the survival probability and the product imitation strategy does in the rest of the period. It implies that it is important to form a Dominant Design through mutual imitation process before Shakeout while it is important to develop a unique product through product differentiation because it faces intense price competition when following Dominant Design in Shakeout period. 새로 생성된 산업에서 다수의 진입이 발생하다가 일정 시점에 달하면 총 기업 수가 급감하는 Shakeout 현상이 종종 발견된다. 한편 진화경제학의 선택과 적응의 관점에 따르면 기업은 환경에 의해 선택되기도 하지만 적응 노력을 통해 시장 환경에 적응할 수 있는 능동적존재이다. 본 연구는 진화경제학의 적응과 선택의 개념을 제품수준 분석에 적용하여 이를Shakeout 이라는 산업수준의 논의로 확대하는 것을 목표로 한다. 이를 위해 1905-1942년미국 자동차 시장을 대상으로 Shakeout 시기와 그 전후로 산업단계를 구분하여 적응전략과선택 메커니즘을 Cox 위험 비례모형을 이용하여 분석하였다. 분석결과 Shakeout 시기에서는제품 차별화 전략이, 나머지 시기에서는 제품 모방전략이 생존 확률을 높이는 적응전략임을확인하였다. 이는 Shakeout 이전 시기에는 상호간 모방과정을 통해 Dominant Design을 형성시키는 것이 중요한 반면 Shakeout 시기에는 Dominant Design을 따라가면 치열한 가격경쟁에 직면하기 때문에 오히려 제품 차별화를 통해 독자적인 제품을 개발하는 것이 중요함을시사한다.
거제도 인근해상에서 운용되는 함정의 적외선 신호 변화 특성에 대한 연구
길태준,김태국,Kil, Tae-Jun,Kim, Tae-Kuk 한국군사과학기술학회 2014 한국군사과학기술학회지 Vol.17 No.1
It is essential to understand the infrared signature of a naval ship to survive against various missile attacks under variable environmental conditions. As guided missiles are developing to equip more accurate IR seekers, research works for countermeasure and IR stealth technology are strongly required. But challenging works are continuously suggested for predicting and analyzing IR signal status of naval ships to achieve low observable performance under various weather conditions, variable missions and developing threats. In this study, overall guidelines of setting design criteria for low observable ships are proposed by considering varying environmental conditions including daily and seasonal variations. Test and evaluation criteria for newly constructed ships for target and background temperature difference is proposed as a design criteria which can be predicted by change of condition and ship's speed. Through the proposed techniques and procedures, it is expected to establish the measurement and evaluation criteria by using temperature, IR Signal differences between the ship and the background.
길태준(Tae-Jun Kil),김재영(Jae-Young Kim),김소미(Somi Kim),김학진(Hak-Jin Kim),남웅(Woong Nam) 대한구강악안면외과학회 2010 대한구강악안면외과학회지 Vol.36 No.3
An osteochondroma is an osseous protuberance with cartilaginous growth potential, usually arising in skeletal bone and relatively uncommon in the craniofacial bone. Osteochondroma of the craniofacial region usually occurs at the condyle or the tip of the coronoid process, and rarely arises in the mandibular body, symphysis, ramus, and similar areas. Excision of the lesion including the periosteum is curative, and recurrence or malignant change (usually to a chondrosarcoma) after treatment is rare. We present an atypical case of osteochondroma in the left mandibular inferior border with review of literature.
김종윤,김학진,길태준,김재영,김형준,차인호,남웅,Kim, Jong-Yun,Kim, Hak-Jin,Kil, Tae-Jun,Kim, Jae-Young,Kim, Hyung-Jun,Cha, In-Ho,Nam, Woong 대한악안면성형재건외과학회 2010 Maxillofacial Plastic Reconstructive Surgery Vol.32 No.2
Osteoblastoma is a rare tumor of bone representing less than 1% of all tumors of the maxillofacial region. This is a neoplasm of bone characterized by a proliferation of osteoblasts forming bone trabeculae. Because the clinical feature of benign osteoblastoma is nonspecific and osteoblastoma has a pleomorphic histologic appearance, the differential diagnosis is difficult problem. We studies the case records 3 new patients with osteoblastoma. We discussed the case from clinical, radiologic, and histologic feature for differential diagnosis. Three cases from our clinic is reported and analized with previously described cases.
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.