(Gd₁-x-y TbxCey)₂(MoO₄)₃단결정의 육성과 형광특성

기문광,정중현,김중환 釜山水産大學校 1992 釜山水産大學 硏究報告 Vol.32 No.2

This paper studied the concentration effect and energy transfer process between ??ion and ?? ion in gadolinium molybdate crystal in order to inquire into the possibility for obtaining new laser material. Compound were prepared by the usual solid state reaction technique. All of these compounds have been grown as single crystal by Czochralski method. Absorption spectra of ?? in Gd�(MoO�)�were observed broad and strong. Extraordinally in different materials absorption band is shift to longer wavelength. Energy transfer efficiency from ?? to ?? is merely 17% for (x=0.001, y=0.001) crystal. But in the case of (x=0.1, y=0.001) crystal, intensity of emission spectra of ?? were a thousand times higher than that of former crystal due to a high degree of energy transfer efficiency.

都市景觀에서 時間의 連續性으로 본 非定形 建築의 造形的 意味에 관한 硏究

문정필,김기환 대한건축학회 2004 대한건축학회논문집 Vol.20 No.1

Townscape exist not only in terms of irregular architecture in reference to space component or time continuity, but it is composed with wide a meanings. With townscape as an component of irregular architecture, as well as a time continuum. Such a background the introduction of concept is including harmony with continuous variety progress townscape with architecture form sense of an irregular architecture form. As follow is detail of this study. First, in terms of a time continuum, it provides meaning which dynamical time spirit and time continuity in the form of irregular architecture considering with that the present state of the connection from the past memory of environmental landscape and regenerative function. Second, in terms of this study it was determined, that the time continuum or flow as it relates to architecture on this study was that it was found that as this time continuum when it relates to human senses, and human life in generals negates, any reference to Einstein both theory of simultaneity, as it relates to urban space and architecture form by both in terms of this study, movement and time continuum.

프랭크 게리와 피터 아이젠만의 建築造形에 나타난 力動性에 관한 硏究

문정필,김기환 대한건축학회 2003 대한건축학회논문집 Vol.19 No.5

This study aims to search common flow types in factors of dynamic design using Frank Gehry and Peter Eisenman by compare with their architectural works and background. The common characteristics of these architectural thinking and architectural works unlimited in architectural concept but Gehry drew plastic architecture type Interchanges in art by expended thinking and Eisenman is deduced language type of architecture applied with language model. Even Frank Gehry and Peter Eisenman had different view of ideological characteristic, we could find that dynamic plastic common type of expression in visual. The major results were as follows; 1) Dynamic factor of changeable design factor, 2) The pursuit of digital media, 3) Formal composition trends, 4) Dynamic design using architectural materials and color. The result of these common types are tension, movement, dynamic color, media expression including nonlinear deformation, fractal, spastical folder concept, expressed mixed factor with dynamics. Frank Gehry and Peter Eisenman using 3 dimension space and form design with compute technology, also they raised value in use by using metal materials after analyzed properties of matter and property. Moreover, they solved construct-ability and economical efficiency with dynamic form to visual value of architectural works by high standard of color pattern. The dynamic plasticity of architecture is set important facts contemporary architecture.

방사선치료 조사영역 내에 발생한 설암 환자에서 입체조형방사선치료 경험 : 증례보고

조문준,장지영,김기환,김병국,송창준,김준상,김재성 충남대학교 암공동연구소 2003 암공동연구소 업적집 Vol.3 No.

Objectives : We report an interim result of conformal radiotherapy in a patient with early stage cancer at the base of the tongue, which developed in a previously irradiated area. Materials and Methods : A 64-year-old male patient was diagnosed with T4NOMO supraglottic cancer. He received 72Gy of radiation therapy from 21 November 1988 to 24 February 1989. He had local failure and underwent a salvage total laryngectomy on 28 August 1989. Subsequently, he did well. In early 1999, he suffered from throat pain. He had a 2.5cm ulcerative mass at the base of his tongue, in the area that had been irradiated previously. Biopsy showed squamous cell carcinoma. After workup, he was diagnosed with base of tongue cancer with T2NOMO. Surgery was not feasible because the morbidity was not acceptable. Since it was difficult to re-irradiate the area with a curable dose using conventional 2D radiation therapy with an acceptable morbidity, we decided to try conformal radiotherapy. We used 7 static beam ports with field sizes from 7×6.4 to 8×8㎠, using 6 and 10MV photons. The fractionation regimen was 1.8Gy, 5 times per week. He received 64.8Gy in 36 fractions from 9 April 1999 to 1 June 1999. Results : In the 21 months since radiotherapy, the patient has not experienced any acute or chronic complications, such as xerostomia. He experienced relief of pain shortly after the start of radiotherapy, showed a complete response, and is still doing well. Conclusion : Conformal radiotherapy can be used to treat cancer that develops within a previously irradiated field, with curative intent.

대사성 산증을 동반한 알코올성 간질환 환자의 단기 예후

배기선,유권,조유경,심기남,정성애,문일환 대한간학회 2004 Clinical and Molecular Hepatology(대한간학회지) Vol.10 No.2

목적: 알코올성 간질환에서의 대사성 산증은 지속적인 과량의 알코올 섭취로 인한 당 신생 합성의 억제와 BOHB/AcAc 비율의 증가, 단기간의 금식으로 인한 저혈당, 인슐린 분비 저하, 유리 지방산과 케톤체 형성의 증가, 구토와 수분 섭취 부족에 의한 심한 탈수에 의해 발생하는 것으로 알려져 있다. 알코올성 케톤산증과 감별할 질환으로는 당뇨병성 케톤산증, 젖산증, 살리실레이트, 메탄올, 에틸렌글리콜 중독 등이 있다. 본 연구는 대사성 산증을 동반한 알코올성 간질환으로 내원하여 입원한 환자들을 대상으로 생존군과 사망군에서 임상적 양상 및 검사 소견들의 차이를 비교하여 단기 예후와 연관 있는 인자들을 알아보고자 하였다. 대상과 방법: 만성 알코올 남용자이면서 대사성 산증을 동반하여 입원한 알코올성 간질환 환자 29명을 생존군(18명)과 사망군(11명)으로 나누어 임상 소견과 검사실 소견을 비교하였다. 결과: 1) 대상 환자군은 연령은 36-65세였으며, 성별은 남자가 26명이었고 여자가 3명이었다. 2) 임상 증상은 의식저하, 복통, 구토, 호흡 곤란, 토혈, 흉통 등 다양하게 나타났으며, 신체검사 소견은 탈수, 황달, 빈혈, 간비대, 복수, 부종 등이었고 두 집단을 비교했을 때 사망군에서 복수가 유의하게 더 많은 빈도로 관찰되었다. 일일 평균 음주량은 사망군에서 유의하게 더 많았고(198 vs. 123, P=0.034) 음주 기간과 총 음주량은 두 군 간에 유의한 차이를 보이지 않았다. 4) 내원시 혈액검사 소견을 비교하였을 때 사망군에서 동맥혈 산염기 차이가 유의하게 낮았고 헤모글로빈, 혈소판도 유의하게 낮았다. 사망군에서 총 비리루빈, 크레아티닌, 무기인, 암모니아가 유의하게 높았고 알부민, 클로라이드가 유의하게 낮았다. 사망군에서 프로트롬빈 시간이 유의하게 연장되었으며 섬유소원은 유의하게 낮았고 D dimer는 유의하게 높았다. 결론: 대사성 산증을 동반한 알코올성 간질환 환자에서 일일 알코올 섭취량을 파악하고 복수의 유무, 동맥혈 산염기 차이, 헤모글로빈, 혈소판, 총 빌리루빈, 알부민, 크레아티닌, 무기인, 클로라이드, 암모니아, 프로트롬빈 시간, 섬유소원, D dimer 등을 검사하는 것이 단기 예후를 예측하는 데 도움이 될 것으로 사료된다. 향후 많은 환자들을 대상으로 하여 예후 관련 인자들에 대한 전향적이고 체계적인 연구가 요망된다. Background/Aims: Alcoholic liver disease with metabolic acidosis may have possible causes such as alcoholic ketoacidosis, diabetic ketoacidosis, lactic acidosis. Salicylate, methanol, and ethylene glycol intoxication should also be considered. The aim of this study was to investigate the short-term prognostic factors in patients with alcoholic liver disease with metabolic acidosis. Methods: Clinical data related to twenty-nine patients with alcoholic liver disease and metabolic acidosis was analysed retrospectively. Patients were divided into two groups according to the outcome (survival or death). Past medical history, and physical, laboratory and radiologic data at admission were compared. Results: The amount of daily alcohol intake differed significantly between the two groups (P=0.034), but duration and total amount of alcohol intake did not differ significantly between the two groups (P=0.128; P=0.360). The presence of ascites differed significantly between two the groups (P=0.019). On laboratory testing, the following differed significantly: base excess (P=0.038), hemoglobin (P=0.019), platelet (P=0.040), total bilirubin (P=0.007), albumin (P=0.012), creatinine (P=0.014), phosphorus (P=0.021), chloride (P=0.010), ammonia (P=0.003), prothrombin time (P=0.033), fibrinogen (P=0.011) and D-dimer (P=0.024). Review of the medical history of the patients showed diabetes (10/29), cirrhosis (10/29), and hepatocellular carcinoma (1/29). Combined conditions at admission were sepsis (8/29), pneumonia (7/29), acute renal failure (6/29), rhabdomyolysis (5/29), gastrointestinal hemorrhage (4/29), acute pancreatitis (3/29), acute respiratory distress syndrome (2/29), and acute myocardial infarction (1/29). Conclusions: The amount of daily alcohol intake, base excess, hemoglobin, platelet, total bilirubin, albumin, creatinine, phosphorus, chloride, ammonia, prothrombin time, fibrinogen and D-dimer seemed to be useful parameters in predicting short-term prognosis of patients with alcoholic liver disease with metabolic acidosis. Further study is needed to define the significance of these factors. (Korean J Hepatol 2004;10:117-124)

車輛用 無接点式 点火裝置에 關한 硏究

姜錤文,田炳實,김종교,金煥溶 全北大學校 1979 論文集 Vol.21 No.-

We choose the magnet detecting system of many that a ignition signal voltage can be induced in a pick-up coil by the rotation of timing rotor in distributor. As the timing rotor rotates with cam gear, the magnetic flux alternating rate changes through timing rotor-magnet-bracket-pick up coil. At this time, a detecting transistor detects the ignition signal on the pick-up coil and makes it a switching signal. This switching signal is amplified by transistors and applied to the primary of ignition coil in transistor ignition system without break point. In CDI ignition system without break point, the amplified switching signal is applied to the gate of SCR, a switching element. When a signal triggers the gate, a very high voltage appeared instantaneously in the secondary of ignition coil. A transistor and a CDI ignition circuit without point are designed respectively in fig. 6 & fig. 12. As a result of practical test on road, the CDI ignition system without break point among them presented the best running characteristics as fig. 14.

방사선치료 조사영역 내에 발생한 설암 환자에서 입체조형방사선치료 경험 : 증례보고

조문준,장지영,김기환,김병국,송창준,김준상,김재성 충남대학교 암연구소 2003 암연구소 업적집 Vol.3 No.-

Objectives : We report an interim result of conformal radiotherapy in a patient with early stage cancer at the base of the tongue, which developed in a previously irradiated area. Materials and Methods : A 64-year-old male patient was diagnosed with T4NOMO supraglottic cancer. He received 72Gy of radiation therapy from 21 November 1988 to 24 February 1989. He had local failure and underwent a salvage total laryngectomy on 28 August 1989. Subsequently, he did well. In early 1999, he suffered from throat pain. He had a 2.5cm ulcerative mass at the base of his tongue, in the area that had been irradiated previously. Biopsy showed squamous cell carcinoma. After workup, he was diagnosed with base of tongue cancer with T2NOMO. Surgery was not feasible because the morbidity was not acceptable. Since it was difficult to re-irradiate the area with a curable dose using conventional 2D radiation therapy with an acceptable morbidity, we decided to try conformal radiotherapy. We used 7 static beam ports with field sizes from 7×6.4 to 8×8㎠, using 6 and 10MV photons. The fractionation regimen was 1.8Gy, 5 times per week. He received 64.8Gy in 36 fractions from 9 April 1999 to 1 June 1999. Results : In the 21 months since radiotherapy, the patient has not experienced any acute or chronic complications, such as xerostomia. He experienced relief of pain shortly after the start of radiotherapy, showed a complete response, and is still doing well. Conclusion : Conformal radiotherapy can be used to treat cancer that develops within a previously irradiated field, with curative intent.

시간-주파수 해석법에 의한 CFRP의 파괴 거동

남기우,안석환,이상기,김현수,문창권 한국비파괴검사학회 2001 한국비파괴검사학회지 Vol.21 No.1

신호처리법으로 현재 많이 사용되고 있는 푸리에 변환은 신호의 주파수 성분이 사간에 따라 어떻게 변화하는지를 표현하지 못한다. 따라서 최근 이와 같은 푸리에 변환의 단점을 보완하여, 신호의 시간과 주파수에 대한 정보를 동시에 표현할 수 있는 시간-주파수 해석법들이 개발되었다. 본 연구에서는 음향방출을 이용하여 복합재료의 주요 발생원으로 알려져 있는 기지균열, 섬유분리, 섬유파괴 및 층간분리 등과 같은 파괴기구를 해석하였다. 각각의 파괴특성이 나타나도록 시험편을 제작하여 인장시험 시 검출된 음향방출신호의 시간-주파수 해석을 통해 전체 파괴기구의 특징을 분석하였다. Fourier transform has been one of the most common tools to study the frequency characteristics of signals. With the Fourier transform alone, however, it is difficult to tell whether signal's frequency contents evolve in time or not. Except for a few special cases, the frequency contents of most signals encountered in the real world change with time. Time-frequency analysis methods are developed recently to overcome the drawbacks of Fourier transform, which can represent the information of signals in time and frequency at the same time. In this study, damage process of cross-ply carbon fiber reinforced plastic (CFRP) under monotonic tensile loading was characterized by acoustic emission. Different kinds of CFRP specimens were used to determine the characteristics of AE signals. Time-frequency analysis methods were employed for the analysis of fracture mechanisms in CFRP such as matrix cracking, debonding, fiber fracture and delamination.

저작근 골막하 박리를 이용한 만성 재발성 탈구의 치험례

심재환,김기홍,문진석,민병진,이원학,홍광진 大韓顎顔面成形再建外科學會 2003 Maxillofacial Plastic Reconstructive Surgery Vol.25 No.3

Chronic recurrent dislocation(CRD) of the jaw has various etilogical causes, including trauma, congenital or acquired neurological illness, ingestion of certain medicines, incorrdination of the neuromuscular astivity of the chewing muscles, articular anatomical alteration, etc. Various surgical methods have been advocated for the treatment of the CRD. They may be divided into two groups: procedures designed to limit translation of the condyle and procedures eliminating obstacles in the condylar path. Hypomobility of mandible can be developed after BSSRO and it is probably caused by scar contracture, atrophy, and myofibrosis. Many authors, therefore, emphasized the importance of physical therapy especially after BSSRO to prevent the complication. Based on that idea, we designed more conservative surgical method to limit mandibular openning compared the methods that previously introduced and tried to treat the CRD. This new method consists of extensive subperiosteal dissection of masseter and the temporalis muscle under local anesthesia and use of intermaxillary elastics for some periods.

소아의 하악골 골절에 관한 임상적 연구

민승기,최문기,오승환,이동근 대한악안면성형재건외과학회 2000 Maxillofacial Plastic Reconstructive Surgery Vol.22 No.5

The jaws of children differ from those of adults in the aspects of architectural and mechanical properties, sites, form and treatment modality. This study reviews the result of treatment of pediatric mandibular fractures between 1994 and 1998 at dept. of Oral & Maxillofacial Surgery, School of dentistry, Wonkwang University by means of the age and sex distribution, mechanism of injury, location of fractures and associated patterns, fracture management, postoperative complications, any associated injuries to other organ systems. Total number of these study was 61 facial bone fractures in 32 patients. The results were as follows. 1.The pediatric mandibular fractures predominated in the age of 6∼12, and had no sexual predilection. 2.The main cause of pediatric mandibular fractures was the traffic related accidents(56.2%) 3.The condylar fracture only was 23 cases (37.7%) in total 61 sites of mandibular fractures and the symphysis fracture was 20 (32.7%) ; the highest incidence of mandibualr fracture was the symphysis with unilateral condyle combined fracture in 61 total mandibular fracture sites. 4.The major postoperative complication was deviation during mouth opening (41.2%) and the facial asymmetry(17.7%) in second. 5.Soft tissue laceration(53%) was the most associated injury with mandibular fracture and the abdominal injury(12.5%), the head injury(12.5%), and the extrimity injury (6.2%) in order.