김중업의 「경주 석굴암 보수공사 설계」(1961-1962)에 관한 고찰

우동선,김태형,Woo, Don-Son,Kim, Tae-hyung 한국건축역사학회 2021 건축역사연구 Vol.30 No.4

This study examines the Gyeongju Seokguram Grotto restoration project (1961-1962) by architect Kim Chung Up (1922-1988) and introduces the documents he wrote at the time of planning. The study highlights Kim's Plan attempt to adopt Buckminster Fuller's idea of the Geodesic Dome, while inheriting the architect Pai Ki Hyung's previous design plan which was nullified. As Seokguram Grotto's water leak and deterioration issues have been brought up, the four-times survey was carried out by experts team between 1958 and 1960, under Ministry of Education's direction. Pai designed an initial restoration plan based on the survey's result, which was a double-dome structure with a concrete film on the outer periphery as a way to protect Seokguram Grotto in January 1961. However, as drawbacks, such as the heavy load of the concrete dome, and non-installation of entrance hall, have been indicated in the review process, the Cultural Properties Committee rejected the plan. Subsequently, Kim was appointed as the supervisor of the second restoration project. Kim drew up a process management schedule to be implemented from August 1961 to December 1963 and designed the conception plans for the second restoration design. This study analyzes Kim's Plan by examining sketches, site plans, floor plans, and sections. Kim planned to maintain the idea of the double-dome structure proposed by Pai while applying Buckminster Fuller's idea of the Geodesic Dome. Kim planned to lighten the dome structure by applying a steel-frame Geodesic Dome so that the dome structure could be supported by its own. The study is expected to reclaim the omitted parts from Seokguram Grotto's historical description and Kim's careers.

반사형 쌍안정 카이랄 스플레이 네마틱 액정표시소자

김태형,이중하,신정국,장지향,김정수,전철규,권순범,윤태훈,김재창,Kim, Tae-Hyung,Lee, Joong-Ha,Shen, Zheng-Guo,Jang, Ji-Hyang,Kim, Jeong-Soo,Jhun, Chul-Gyu,Kwon, Soon-Bum,Yoon, Tae-Hoon,Kim, Jae-Chang 한국광학회 2011 한국광학회지 Vol.22 No.1

쌍안정 카이랄 스플레이 네마틱 액정표시소자는 스플레이 상태와 $-\pi$ 꼬인 상태를 쌍안정 상태로 사용하는 메모리 액정표시소자이다. 셀 갭/피치의 값이 0.25일 경우 완전한 쌍안정 상태를 갖지만, $-\pi$ 꼬인 상태에서 스플레이 상태로 전이시키기 위하여 fringe 전계를 인가할 경우 픽셀영역은 전계의 왜곡에 의해서 완전한 스플레이 상태가 아니라 $-\pi$ 꼬인 상태를 부분적으로 유지하게 된다. 본 논문에서는 화소영역에서 두 안정한 상태가 공존하지 않는 $-\pi$ 꼬인 상태를 어두운 상태로 사용하는 반사형 쌍안정 카이랄 스플레이 네마틱 액정표시소자를 제안한다. 제작된 반사형 액정표시소자는 30:1의 고명암비를 나타냈으며, 응답속도는 수직전압 8 V, fringe 전압 12 V의 구동 전압으로 각각 쓰기 응답시간이 950 ms, 리셋 응답시간이 450 ms였다. 또한 제안된 셀은 +C 광학 보상 필름을 사용하여 좌우 방향에서 $180^{\circ}$의 광시야각을 나타냈다. Bistable chiral splay nematic liquid crystal display (BCSN LCD) is a memory type liquid crystal display using splay and $-\pi$ twist states as two stable states. When the cell thickness to pitch (d/p) ratio is 0.25, splay and $-\pi$ twist states have permanent memory time. However, when the transition from $-\pi$ twist state to splay state is caused by a fringe field, pixel regions show that the splay state is not perfect, but rather includes a contribution from the $-\pi$ twist state. In this paper, we propose a reflective BCSN LCD using $-\pi$ twist state in which the two stable states do not coexist. The fabricated reflective BCSN LC cell shows a high contrast ratio of over 30:1 and response times of 950 ms and 450 ms in vertical and fringe field switching, respectively. The proposed cell also shows wide viewing angle characteristics of $180^{\circ}$ in left- and right directions.

편측 신장 무형성 및 쇄항을 동반한 Mayer-Rokitansky-Kuster-Hauser(MRKH) 증후군 1례

김태형,김진희,김수영,Kim, Tae-Hyung,Kim, Jin-Hee,Kim, Soo-Yung 대한소아신장학회 2006 Childhood kidney diseases Vol.10 No.2

MRKH 증후군은 비뇨생식기계 및 골격계에 기형을 동반하지만 쇄항에 대한 동반 기형유무 검사상에서 MRKH 증후군으로 진단된 경우는 거의 보고되고 있지 않다. 이에 저자들은 쇄항을 주소로 내원한 34주 미숙아에서 MRKH 증후군으로 진단된 본 증례를 경험하였기에 문헌고찰과 함께 보고하는 바이다. The clinical features of the Mayer-Rokitansky-K$\ddot{u}$ster-Hauser(MRKH) syndrome include normal female secondary sex characteristics, normal genitalia, congenital absence of vagina, rudimentary or bipartite uterus, normal ovarian function and normal ovulation, 46, XX, karyotype, frequent association of renal, skeletal and other congenital anomalies. We experienced a case of a premature infant with MRKH syndrome who had imperforate anus and unilateral renal agenesis.

Modeling of the Tensile Strength of Unsaturated Granular Soil Using Soil-water Characteristic Curve

김태형,김찬기,김태훈,Kim Tae-Hyung,Kim Chan-Kee,Kim Tae-Hoon Korean Geotechnical Society 2004 한국지반공학회논문집 Vol.20 No.7

본 연구는 불포화 상태 전 범위에 대한 사질토의 인장강도 모델화 가능성을 조사하기 위해 실시 되었다. 새로 개발된 직접인장시험기법을 이용하여 인장시험이 실시되었다. 측정된 결과는 Rumpf 및 Schubert가 동일크기의 이상적인 구에 대해 개발한 이론적인 인장강도 모델들에 의한 예측 값과 비교 되었다. 이를 위해 석션-포화실험을 통해 얻어진 흙-수분특성곡선을 이용하여 이론모델에 있어 중요한 요소인 불포화상태(pendular, funicular, capillary) 구분 및 음의 간극수압 값을 산정하는데 사용하였다. Pendular 상태에서 불포화모래의 비선형 거동이 Rumpf의 모델에 의해 적절이 묘사되었다. Funicular 및 capillary상태의 경우, 함수비가 증가함에 따라 인장강도가 증가하다 최고 값이 도달한 후 다시 감소하는 실험 측정치의 경향도 Schubert의 모델에 의해 적절히 묘사되었다. 본 비교 연구는 이상적인 단일 크기의 입자에 대해 개발된 이론적인 모델이 다양한 크기를 갖는 불포화 사질토의 인장강도를 예측할 수 있다는 가능성을 뒷받침해준다. This study was conducted to explore the tensile strength models in granular soil at the full range of unsaturated state. Direct tension experiments were carried out with a newly developed direct tension technique. The measured experimental data were compared with theoretical models developed by Rumpf and Schubert for monosized ideal particulate solids at the unsaturated state. To do this, the soil-water characteristic curve obtained from a suction-saturation experiment was used to define the unsaturation state and the negative pore water pressure with different water content levels, which are important factors in theoretical tensile strength models. The nonlinear behavior of the tensile strength for unsaturated granular soil at the pendular state is appropriately simulated with Rumpf's model. For the funicular and capillary states, the predicted trend by Schubert's model is properly matched with the experimental data: tensile strength steadily increases and reaches a maximum value and then decreases until it reaches zero. This comparison supports the concept that the tensile strength of unsaturated real granular soil can be approximately simulated with theoretical models.

로브곡선을 이용한 자동차용 신강재의 저항 점 용접성 평가 기술 개발

김태형,이동옥,이세헌,Kim, Tae-Hyung,Lee, Dong-Ock,Rhee, Se-Hun 대한용접접합학회 2005 대한용접·접합학회지 Vol.23 No.4

The resistance spot welding is one of the most commonly used welding process for joining the sheet metal in automotive manufacturing process due to higher deposition rates and higher economy achieved. Control variables in the resistance spot welding for achieving high quality are welding current, welding force and welding time. Generally at the manufacturing scene, welding current Vs welding time lobe diagram is used to estimate weldability because controlling welding force is not practical due to economical reasons. However new automotive steel plates have been developed to make lightweight automobiles and to improve resistance against rusting. Also the weldability of these steel plates are worst than the existing steel plates because of changing bare metal and surface plating effect. In consequence of above mentioned reasons, it is necessary to use welding force to present the lobe diagram. In this study, we obtained the welding force Vs welding current lobe diagram for commonly used GA steel plate and found that the second order repression model of tensile shear strength was useful in reducing the number of experiments, and the indentation, and thickness change during welding were used as a response to estimate quantitatively expulsion.

상악 완전 무치악 및 하악 부분 무치악 환자에서 임플란트 지지형 고정성 보철물을 이용한 전악 수복 증례 보고

김태형,오경철,문홍석,Kim, Tae-Hyung,Oh, Kyung-Chul,Moon, Hong-Seok 대한치과보철학회 2019 대한치과보철학회지 Vol.57 No.4

넓은 영역의 무치악 부위를 수복하기 위한 전통적인 방법은 의치를 이용한 치료다. 하지만, 임플란트를 활용할 경우 보철물의 안정과 유지, 그리고 지지의 측면에서 더 유리하며, 저작효율이 향상되는 등 기능적으로 더 양호한 결과를 얻을 수 있다. 이 같은 임플란트를 이용한 치료방법은 크게 가철성과 고정성 방식으로 분류될 수 있으며, 치조골의 흡수정도, 악간관계, 환자의 선호도, 사회 경제적 요인 등을 고려하여 적절한 접근 방식을 선택하여야 한다. 한편, 지르코니아의 물성이 크게 개선됨에 따라, 임플란트 지지형 고정성 보철물의 재료로서 단일구조 지르코니아가 각광을 받고 있다. 단일구조 지르코니아는 지르코니아 코어에 세라믹을 비니어링 한 보철물이나 금속 도재관보다 파절과 chipping의 빈도가 적으며 지르코니아 자체가 충분한 두께를 가질 수 있어 구조적으로 좋은 물성을 지닐 수 있다. 최근에는 투명도가 증진된 단일구조 지르코니아도 출시되어, 전치부 보철물을 위한 재료로도 널리 사용되고 있다. 본 증례의 남환은 상악 양측 구치부의 결손 및 다수 잔존치의 중등도 이상의 전반적 만성 치주염 이환으로 인해, 하악 양측 견치 및 좌측 제1, 2 소구치를 제외한 모든 치아를 발치한 후, 상악 8개 및 하악 3개의 임플란트 식립을 동반한 전악 수복 치료를 받았다. 보철물 장착 후 1년 간의 경과 관찰 기간 동안 기능적, 심미적으로 만족할만한 결과를 얻어 이를 보고하는 바이다. A conventional approach for the treatment of long-span edentulous areas is the use of removable dentures. However, placing implants in these areas results in superior functional outcomes by increasing the stability, support, and resistance of the prostheses and improving the masticatory efficiency. Treatment modalities utilizing implants can be further classified into either removable or fixed-type prostheses. Several factors such as the amount of alveolar bone resorption, inter-arch relationship, patient preferences, and socioeconomic status should be considered when determining the appropriate treatment approach. Monolithic zirconia has been considered a suitable material for implant-supported fixed dental prosthesis, because of the drastic improvement in its mechanical properties. It exhibits fewer incidences of fracture and chipping of the prostheses, and has greater bulk of material than metal-ceramic crowns and zirconia-veneered ceramics. Moreover, highly translucent monolithic zirconia is also available in the market, and its application is gradually increasing for anterior tooth rehabilitation. The present report describes a patient who underwent full-mouth rehabilitation with fixed dental prostheses (eight upper and three lower implant placements). All teeth, except bilateral mandibular canines and left mandibular first and second premolars, were extracted after the diagnosis of generalized chronic moderate-to-advanced periodontitis of the remaining teeth. The patient reported satisfactory esthetic and functional outcomes during the one-year follow-up visit.

결막 내 이식했던 양막을 이용한 난치성 각막 윤부결핍 질환 치료 1예

김태형,정재훈,전연숙,김재찬,Tae Hyung Kim,Jae Hoon Jeong,Yeoun Sook Chun,Jae Chan Kim 대한안과학회 2011 대한안과학회지 Vol.52 No.9

Purpose: To report the use of amniotic membrane (AM) as a mesenchymal stem cell (MSC) carrier in cornea perforation with severe limbal stem cell deficiency due to a chemical burn on both eyes. Case summary: The patient in the present study is a 43-year-old man with a history of bilateral alkaline chemical injury six years previously. The patient suffered from total limbal stem cell deficiency (LSCD) in the injured eyes and underwent numerous operations including autologous conjunctival flap, AM graft, penetrating keratoplasty, keratolimbal autograft and ex vivo expanded limbal allogrft. However, the patient’s ocular condition deteriorated due to persistent LSCD, which led to corneal perforation resulting in the need for an urgent therapeutic operation. In the patient’s past ocular history, Ahmed valve implantation was performed for uncontrolled IOP. Revision of the Ahmed tube due to exposure and conjunctival erosion was performed again via placement of an AM over the exposed tube one year previous to presentation to our hospital. The authors performed a transplanted AM graft at the cornea perforation using sub-conjunctival AM believed to contain MSCs. Six months postoperatively, the ocular surface was well mainatained and the graft remained healthy. Transplanted AM showed morphological and immunohistochemical findings similar to those of MSCs. Conclusions: Results from the present study confirm that AM transplanted into the conjunctiva is a useful carrier of bone marrow-derived MSCs in severe ocular surface diseases. J Korean Ophthalmol Soc 2011;52(9):1104-1108

자동차 차체 제조 공정에서 용접 공정 오류 검출을 위한 지능형 모니터링 시스템 개발

김태형,유지영,이세헌,박영환,Kim, Tae-Hyung,Yu, Ji-Young,Rhee, Se-Hun,Park, Young-Whan 대한용접접합학회 2010 대한용접·접합학회지 Vol.28 No.4

In resistance spot welding, regardless of the optimal condition, bad weld quality was still produced due to complicated manufacturing processes such as electrode wear, misalignment between the electrode and workpiece, poor part fit-up, and etc.. Therefore, the goal of this study was to measure the process signal which contains weld quality information, and to develop the process fault monitoring system. Welding force signal obtained through variety experimental conditions was analyzed and divided into three categories: good, shunt, and poor fit-up group. And then a monitoring algorithm made up of an artificial neural network that could estimate the process fault of each different category based on pattern was developed.

마이크로파 탐색기의 HPRF 파형에 대한 지표면 부엽 클러터 분포의 추정

김태형,변영진,이재웅,Kim, Tae-Hyung,Byun, Young-Jin,Yi, Jae-Woong 한국군사과학기술학회 2009 한국군사과학기술학회지 Vol.12 No.1

Tracking and detecting targets by the M/W seeker is affected by the clutter reflecting from the earth's surface. In order to detect the look-down retreating targets, which appear in the sidelobe clutter region, in the M/W seeker of High PRF mode, it is necessary to understand statistical characteristics of the surface sidelobe clutter. Statistical analysis of sidelobe clutter is conducted for several configurations of the surface using data obtained by the CFT (Captive Flight Test) of the M/W seeker in High PRF mode. The probability density function(PDF) fitting is conducted for several configuration and conditions of the surface. PDFs and PDF parameters, which best describe statistical distribution of sidelobe clutter, are estimated.

연속 웨이브렛 역변환의 특성 및 멀티 뱅크 시스템

김태형,윤동한,Kim Tae-hyung,Yoon Dong-han 한국정보통신학회 2005 한국정보통신학회논문지 Vol.9 No.2

이 논문은 신호 f(t)의 실제적인 스케일 정보를 나타내는 웨이브렛 플랜을 중심으로 연속 웨이브렛 역변환의 특성에 대하여 논하였다. 웨이브렛 변환에 비해 역변환의 적용이 상대적으로 미비한 이유는 수치적인 연산의 복잡성에 기인한 것이며, 이 논문은 웨이브렛 역변환의 안정된 복원을 위한 방법에 대하여 연구하였다. 웨이브렛 역변환의 안정적인 구현은 신호 f(t)에 대한 실제적인 스케일 정보를 지니고 있는 웨이브렛 플랜이라는 새로운 "시간-스케일" 공간을 통하여 실현하였으며, 이는 완전한 멀티 필터 뱅크 시스템과 동일한 특성을 나타낸다. 즉 연속 웨이브렛 변환을 통해 신호 f(t)의 모든 스케일 성분을 독립적으로 주파수 전체 대역에 걸쳐 분산하고 다시 역변환을 통해 원래의 신호를 복원하는 과정은 필터뱅크이론의 분석과 합성과정과 일치한다 이 논문에서는 연속 웨이브렛 역변환을 이용하여 "시간-스케일" 필터를 통한 신호 f(t)의 스케일 분해와 웨이브렛 멀티 필터 뱅크이론에 대하여 논하였다. This paper is contribute to Inverse continuous wavelets transform(ICWT) which permits to determine real 'time-scale' plan. The application of ICWT is not yet represented because of the numerical difficulty. If the signal can be reconstructed stably by ICWT, the multi scale filter bank system which composed by analysis and synthesis process can be designed. In this work, we represent the ICWT which leads to nearly perfect reconstruction of signal and the multi-scale filter bank system.