측두하와에 발생한 혈관주위 세포종 1예

고태경,홍종철,정진숙,박헌수 대한이비인후과학회 2010 대한이비인후과학회지 두경부외과학 Vol.53 No.8

Hemangiopericytoma is an uncommon vascular tumor in the head and neck region that originates from Zimmerman’s pericytes, the small, spindle-shaped pericapillary cells. Clinical diagnosis of such a lesion is an extremely challenging task because there are very few detailed reports of such lesions and one would hardly think of a diagnosis such as hemangiopericytoma while examining a lesion. Only 15% of hemangiopericytomas are localized in the cervicofacial region,with occurrence in the infratemporal fossa is particularly exceptional. In this article, we report an unusual case of hemangiopericytoma originating from the right infratemporal area and extending into the pterygomaxillary fissure, the buccal fat pad, and the hard palate. We present a case of infratemporal fossa hemangiopericytoma that was treated by resection of the transantral approach. Korean J Otorhinolaryngol-Head Neck Surg 2010;53:511-4

전장하에서 PLZTd의 반강유전-강유전 상전이의 동시적 X-선 회절 측정

고태경,조동수,강현구 한국세라믹학회 1996 한국세라믹학회지 Vol.33 No.11

PLZT(x/70/30)의 x=7.5, 8.0, 8.5, 10.5 조성에 대하여 전계인가와 동시에 X-선 회절측정을 전계 20kV/cm에 이르기까지 수행하였다. 모든 PLZT는 입방상에 속하였다. x=7.5, 8.0, 8.5에서 PLZT는 4~8kV/cm의 낮은 전계에 이르기까지 반강유전적인 특성을 보였으며 보다 높은 전계에서는 강유전적인 특성을 나타내었다. 온도에 따른 유전상수의 측정에 따르면 x=7.5, 8.0, 8.5 조성에서 PLZT는 완화형 강유전체와 유사하였으며 50-7$0^{\circ}C$에서 확산적인 반강유전-상유전 상전이가 나타났다. 자발분극-전계(P-E) 이력곡선은 이들이 반강유전적인 특성을 가지고 있음을 보여주었다. 매우 넓은 큐리점의 분포는 이들 PLZT의 결정구조에서 La 치환에 의한 양이온 및 빈자리의 무질서도가 상당함을 시사한다. PLZT (10.5/70/30)의 전계에 따른 변형은 매우 미미하였으며 이력현상이 없는 상유전적인 특성을 보였다. 전계인가에 따른 변형률은 La 치환량이 증가함에 따라 감소하였다. PLZT(7.5/70/30)에서 110회절선의 강도는 전계인가에 민감하게 변화하여, [110] 방향에 평행한 자발분극을 가지는 분역이 전계인가로 유도된 PLZT의 강유전상에서 발달된 것처럼 여겨진다. In-site X-ray diffraction measurements under electric field up to 20kV/ cm were carried out on PLZT (x/70/30) with x=7.5, 8.0, 8.5, and 10.5 All of PLZT belonged to cubic phases. At x=7.5, 8.0 and 8.5 PLZT behaved as an antiferroelectric under low electric fields up to 4-8 kV/cm. PLZT became ferroelectric at the higher electric fields. The high-temperature measurements on the dielectric constants of PLZT with x=7.5, 8.0 and 8.5 showed that they were similar to relaxor ferroelectrics and underwent a diffuse phase transition from antiferroelectrics to paraelectrics at 50-7$0^{\circ}C$. Their P-E hysteresis curves confirmed that they were antifer-roelectrics. The broad distribution of Curie points suggests that there is a significant disorder of cations and vacances in the crystal structure of those PLZT due to La-substitution. The variation of the lattice strain of PLZT(10.5/70/30) with electic field was very small and did not show any hysteresis confirming that it was paraelectric. The degree of the electric-induced strain variation decreased as La doping increased. In PLZT(7.5/70/30) the intensity of 110 reflection changes sensitively by applying electric field. Some domains with polarization parallel to [110] appeared to be developed in the field-induced ferroelectric phase of the PLZT.

희토류원소(Y, Nd, Sm, Gd)의 치환에 의한 $Bi_4Ti_3O_{12}$의 결정화학 및 유전물성

고태경,방규석 한국세라믹학회 1995 한국세라믹학회지 Vol.32 No.10

Bi4Ti3O12 (BIT) and its rare earth (Y, Nd, Sm, Gd)-substituted derivatives were synthesized using a sol-gel method to investigate their microstructures, cystal structures and electrical properties depending on the subsituted elemetns. Nd- or Sm-substitution into BIT appeared to be favorable, while Y- or Gd-substitution occurred with a pyrochlore phase. This suggests that a smaller trivalent rare earth ion may not be favorable in the structure of BIT. The rare earth derivatives showed that their particle sizes and shapes were considerably different depending on the kinds of substituted elements. Y-substitution resulted in developing a relatively even particle size and a dense microstructure. In structure, they may be similar to the pseudo-orthorhombic BIT but close to a paraelectric tetragonal phase. Their a (or b) axes were shortened, compared to the one of BIT. Such a distortion may result a decrease in the tilting of TiO6. BIT and the derivatives showed that their dielectric constants and losses were 40~120 and less than 0.03, respectively in the frequency range of 1~10 MHz. The dielectric loss of Y-substituted derivative was the lowest one and changed a little to frequency. Curie points were observed in all the derivatives like BIT to suggest that they would be ferroelectric. The temperature stability of the delectric properties of the derivatives below the Curie points were relatively better than the one of BIT.

세라믹 엑튜에이터 응용을 위한 Sn 치환의 PLZT(7.5/70/30)의 변형특성

고태경,강현구,박재환 한국세라믹학회 1998 한국세라믹학회지 Vol.35 No.5

PLZT(7.5/70/30) was initially a cubic phase having diffuse phase transition at high temperatures. Sn-sub-stitution for PLZT(7.5/70/30) underwent an irreversible phase transition from cubic to rhom-bohedral structure. However PLZTS(7.5/70/30/y=5 & 10) could be reversibly switched from paraelectric to ferroelectric phase under electric field without showing a significant change in crystal structure. With in-creasing the amount of Sn-substitution the P-E behaviors of the PLZTS became more antiferroelectric which was similar to the effect of La-substitution of PLZT. Our study may suggest that Sn-substitution ef-fectively weakens a formation of long-range order between polar Ti-or Zr- containing octahedra which greatly affects strain properties.

WAVE 시스템에서의 WLAN 전파간섭에 관한 실험적 연구

고태경,정준시,정연희,강범구 대한전자공학회 2021 대한전자공학회 학술대회 Vol.2021 No.6

지능형교통체계(ITS: Intelligent Transport Systems)는 전자·정보·통신·제어 등의 기술을 교통체계에 접목시켜 효율적이고 안전성 있는 교통환경을 조성하는 시스템이다. 그러나 ITS는 인프라를 중심으로 차량과 도로 간 교통정보를 한 방향으로만 수집하고 제공한다는 한계가 존재했다. 차세대지능형교통체계(C-ITS: Cooperative Intelligent Transport Systems)는 이러한 ITS의 단점을 보완하고자 인프라 – 자동차, 자동차 – 자동차 간 양방향 통신을 통해 좀 더 높은 효율성과 안전성을 추구하는 차세대 교통 시스템으로 ITS 전용 5.9GHz 대역에서 WAVE(Wireless Access in Vehicular Environments) 방식의 차량사물 통신기술과, C-V2X(Cellular-V2X:이동통신기반 차량통신)가 국내에서 사용되고 있다. 하지만 최근 주파수 분배표가 일부 개정됨에 따라 무선랜(WLAN: Wireless LAN)의 주파수대역이 넓어져ITS 전용 주파수대역과 인접하게 되면서 무선랜 전파간섭에 의한 품질저하가 우려되고 있다. 이에 본 논문에서는 그간 C-ITS 실증사업을 통해 기 구축된 WAVE 시스템에 대해 무선랜 사용에 따른 전파간섭의 영향의 차이를 실험을 통해 알아보고자 한다. Intelligent Transport System(ITS) provides an efficient and safe transportation environment by combining technologies such as electronics, information, communication and control into transportation systems. However there was limit revolved around infrastructure to ITS collecting and providing traffic information between vehicles and roads in one direction. C-ITS(Cooperative Intelligent Transport Systems) is a next-generation transportation system that seeks higher efficiency and safety through bidirectional communication between vehicle and infrastructure. However, due to the recent amendment of table of frequency allocation, the frequency band of the wireless LAN(WLAN) has widened and is adjacent to the ITS-only frequency band, raising concerns about quality degradation caused by WLAN interference. In this paper, we want to find out the difference in the impact of radio interference on WAVE systems built through C-ITS demonstration projects through experiments.

국가이론과 공간경제에의 국가간섭 ( Theories of the State and the State Intervention in Space Economy )

고태경 대한지리학회 1994 대한지리학회지 Vol.29 No.3

촉매제에 의한 BaTi-에톡사이드 솔의 옥소폴리머 변화에 대한 저각 X선 산란연구

고태경,배호기 한국결정학회 1993 韓國結晶學會誌 Vol.4 No.1

BaTi-에톡사이드로 부터 유도된 솔의 옥소폴리머에 대하여 저각 X선 산란을 이용하여 조사하였다. NH, OH를 사용하거나 혹은 촉매제가 없이 얻어진 솔에서 옥소폴리머 구조의 성장은 비슷하다. 이 솔들의 선회반경은 1.66-2.08nm이다. 이들은 차원 값이 1.6인 질량 프락탈의 거동을 따르며 이 거동은 NH40H 첨가량에 는 거의 무관하다. CHSCOOH를 촉매로 사용하여 얻은 솔의 선회반경은 2.87-3.67nm로서 염기성 촉매 혹은 촉매없이 얻은 솔에 비해 보다 큰 값을 가진다 이들 솔의 산란곡선은 중간 Q 영역에서 비슷하며 프락탈 차원은 1.8이다. 염기성 혹은 중성 수화조건으로 부터 얻 은 솔의 윽소폴리머는 짧은 사슬형 구조를 가질 것이나 산성 수화조건에서는 이들은 보다 분기되고 길어지는 사슬형으로 성장되는 경향을 가진다. Small angle X-ray scattering was used to study on the oxopolymers of sols derived from BaTiethoxide. The growths of the oxopolymers in tools obtained with NH40H as catalyst and catalystfree sol are similar. Their radii of gyration are 1.66-2.08nm. They exhibit a mass fractal behavior with a dimension of 1.6, which is almost inde pendent with amount of NH40H addition. Sols catalyzed with CHSCOOH have greater radii of gyration of 3.24-4.OOnm. Their scattering curves are similar in the intermediate Q region, showing a mass fractal dimension of 1.8. The oxopolymers of the tools from the base and the neutral hydrolysis conditions may have a short chain structure.

세계화에 따른 경제 · 정치적 동향 : 경제재구조와 기업가로서의 지방정부 ( Economic and Political Responses to Globalization : Economic Restructuring and Local Government as an Entrepreneur )

고태경 대한지리학회 1996 대한지리학회지 Vol.31 No.4

[연구논문]기술패러다임의 변화와 새로운 산업공간형성

고태경 비판사회학회 1994 경제와 사회 Vol.- No.24

비과 영역에서 두통과 안면통 : 1년 간의 경험

고태경,김소향,이재훈,배우용 대한비과학회 2012 Journal of rhinology Vol.19 No.1

Background and Objectives : Sinus headaches are frequently mistaken as primary headaches, and thus, emphasizes the necessity of a specific diagnosis of symptoms to treat patients properly. Therefore, the authors investigated the specific clinical symptoms of patients who visited a rhinologist complaining of headaches or facial pain. Subjects and Methods : The present study was performed with retrospective clinical analysis of 990 patients who visited rhinologists from August 2010 to August 2011. The presence and characteristics of headaches or facial pain, physical findings, and the results of treatment were investigated. Results : One hundred sixteen out of 990 rhinologic patients complained of headaches or facial pain. Nineteen out of 69 patients with acute rhinosinusitis (27.5%), 28 out of 317 patients with chronic rhinosinusitis (8.8%), 7 out of 11 patients with fungal sinusitis (63.6%), and 10 out of 222 patients with allergic rhinitis (4.5%) had headaches or facial pain. The symptoms of the majority of cases were ameliorated after an appropriate rhinologic treatment. Conclusion : The differential diagnosis of diseases causing headache or facial pain in the rhinologic field should be strongly considered in order to cure patients with headaches more accurately, minimizing erroneous prescriptions.