HHT를 이용한 이상거동 시점 추정 기법 개발

김태헌,박기태 한국구조물진단유지관리공학회 2015 한국구조물진단유지관리공학회 논문집 Vol.19 No.2

Recently, buildings tend to be large size, complex shape and functional. As the size of buildings is becoming massive, the need for structural health monitoring (SHM) technique is increasing. Various SHM techniques have been studied for buildings which have different dynamic characteristics and influenced by various external loads. “Abnormal behavior point” is a moment when the structure starts vibrating abnormally and this can be detected by comparing between before and after abnormal behavior point. In other words, anomalous behavior is a sign of damage on structures and estimating the abnormal behavior point can be directly related to the safety of structure. Abnormal behavior causes damage on structures and this leads to enormous economic damage as well as damage for humans. This study proposes an estimating technique to find abnormal behavior point using Hilber-Huang Transform which is a time-frequency signal analysis technique and the proposed algorithm has been examined through laboratory tests with a bridge model using a shaking table. 최근의 건축물은 복합적인 기능과 형태를 보이고 있으며, 크기가 거대해짐에 따라 구조물 건전성 감시 (Structural Health Monitoring)기술의 수요 또한 증가하고 있다. 구조물마다 고유한 동특성을 가지고 있으며, 다양한 외력의 영향을 받기 때문에 구조물의 건전성을 평가하는 다양한 방법들이 연구되고 있다. 이상거동 시점이란 구조물이 비정상적 (Abnormal)으로 진동하는 시점으로 손상을 명확히 검출하기 위해서는 이상거동의 시점을 기준으로 전과 후를 비교하여야 한다. 즉, 이상거동은 구조물 손상의 이상 징후이며, 정확한 이상거동 시점의 추정은 구조물의 안전과 직결될 수 있다. 이상 거동은 손상을 유발하고 이는 곧 막대한 경제적 피해 및 심각한 인명 피해로 이어지므로 본 연구에서는 시간-주파수 신호분석 기법인 힐버트-황 변환을 이용한 이상거동 시점 추정 기법을 제안하고 진동대를 이용한 모형실험을 통해 제안한 알고리즘의 검증을 수행하였다.

공복에 의한 백서소장 유당분해효소의 활성도 유도 및 그 기전에 관한 연구

김태헌,송인성,김정룡,이국래,임선희 대한소화기학회 1997 대한소화기학회지 Vol.29 No.6

Backgrounds/Aims: To investigate the influence of fasting upon the activity and the gene expression of the intestinal lactase, and to evaluate the effects of systemic hormones on the activity of intestinal lactase after fasting, we had done this experiment. Methods: Forty adult Wistar rats with 200 gm of average weight were divided into 4 groups, of which three groups vvere starved for 1(Group A), 3(Group B), 5 days(Group C) before sacrifice, and the other was a contol group. Their blood was obtained by cardiac punture before sacrifice. And their small intestines were obtained and divided into 3 equal length. Mucosal homogenates were prepared for measurement of specific activities of disaccharidases. Total RNA was extracted for determination of the amount of lactase mRNA by northern and slot hybridization. The serum thyroxine(T₃) and triiodothyronine(T₄) levels were assayed by RIA, Results: Fasting caused a significant increase in lactase activity(p$lt; 0.05), but the amount of the corresponding mRNA was not significantly different(p$lt;0.05). Sucrase activity in the brush border membranes by starvation was slightly decreased, which was not statistically significant. T₃ and T₄ were significantly decreased after starvatic$gt;n(p(0.05). Conclusions: These results indicate that intestinal hydrolases respond non-coordinately to food deprivation. In addition, the thyroid status of the animals has an influence on the aclaptation of intestinal lactase to starvation. And these adaptive processes seem to be partly controlled at a post-transcriptional level.

C / S 환경의 매핑 시스템 개발을 위한 복제 일관성 모델의 설계 및 구현 ( Design and Implementation of Replication Consistency Model for Mapping System in C / S )

김태헌,노치환,이병욱 대한전자공학회 1997 대한전자공학회 학술대회 Vol.1997 No.11

체외수정 및 배아의 자궁내 이식에 있어서의 수정율과 임진율에 관한 연구

김태헌,황맹균 釜山醫師會 1989 釜山醫師會誌 Vol.25 No.3

가토에서 ALSA S-1을 이용한 자가혈장필러와 히알루론산 필러의 지속성 연구

김태헌,김석권,이근철 대한미용성형외과학회 2012 Archives of Aesthetic Plastic Surgery Vol.18 No.2

The ALSA plasma gel filler from ALSA S-1 machine showed better duration than those from the traditional methods. In respect of durability, we injected the ALSA plasma gel filler to the rabbits to see pattern of alteration and the histologic changes in process of time. Twenty-four rabbits were injected with the ALSA plasma gel filler and the hyaluronic acid filler in both sides of its back. The authors assumed the injection site an ellipsoid and evaluated the relative change in volume by measuring the major axis, minor axis, and height after the 1st, 2nd, 4th, 8th and 16th week after the injection. A histologic section was taken on weeks 1st,2nd, 4th, and 16th week. Four weeks after the injection, there was a significant volume decrease in the ALSA plasma gel filler compare to the hyaluronic acid filler. On 16th week, only 2% volume left in the ALSA plasma gel filler group compare to that in the hyaluronic acid filler group, 34%. In histology, both groups showed neither inflammatory change nor foreign body reaction. In this study, we observed an insufficient duration of the ALSA plasma gel filler in comparison with the hyaluronic acid filler.

간동맥 색전술후 담낭변화에 관한 초음파소견

김태헌 대한영상의학회 1987 대한영상의학회지 Vol.23 No.1

Currently transcatheter arterial embolizationis widely used in Korea as a palliative treatment in patients with inoperable heptocellular carcinoma. Embolization of cystic artery is frequently unavoidable in TAE but the effect on gallbladder, its significance and sonographic findings hae not yet been fully ascertained. We analyzed 29 cases of gallbladder in post TAE state by means of sonographc evaluation. The results were as follows. 1. Initial change was observed on the 1st day of TAE. 2. Maximum enlargement of the gallbladder occurred within 3 dayw. 3.Relief of pain was mostly noted in one week. 4. No surgical intervention was necessary for complication of gallbladder, if ever; some medical treatment was sufficient. 5. Non-visualizaton of gallbladder was experienced, possibly due to atrophic changes. 6. Even in the case of cystic artery salvation, mild gallbladder changes were still observed. 7. No significant difference as sonographic findings was discernable in use of vari us embolic materials.

유엔사의 DMZ와 MDL 통과 허가권에 대한 법적 검토

김태헌 법무부 2019 統一과 法律 Vol.0 No.39

The Korean War Armistice Agreement grants the United Nations Command(“UNC”) to have authority to cross Military Demarcation Line(“MDL”) or enter Demilitarized Zone(“DMZ”). Mostly the UNC has permitted to cross or enter. On June 2019, however, UNC unacceptably denied to enter a Guard Post situated in DMZ in Gosung County of Gangwon Province disregarding its purpose for promotion for peace. At this point, this article deals with UNC’s authority and any judicially effective measure against unfair UNC decision. Firstly, this article covers the current procedure on DMZ and MDL entrance. Even though Republic of Korea does not sign the Korean War Armistice Agreement, this Agreement has entered into legal effect as a treaty under Constitution of Republic of Korea. Nextly, the authority to permit is limited to purely military passage. United Nations Security Council Resolution which has been the ground for UNC establishment and the president of Republic of Korea, Syngman Rhee, granted only military command authority. On top of that, the Korean War Armistice Agreement assign UNC to permit all non-military passage by interpretation. In this regard, above-mentioned cases are evaluated as abuse of UNC authority. Nonetheless, it is not guaranteed to have judicially effective ways to appeal UNC’s unfair decision since it has international character. As a realistic and reasonable alternative, this article suggests a legislation between UNC and the Korea Government to defer state’s sovereignty. At the end, it is the most desirable to replace the Korean War Armistice Agreement to a peace treaty or a new arrangement leading to constitutional in terms of the Constitution article 3 and article 4. 국민이 대한민국 영토인 DMZ(비무장지대)와 MDL(군사분계선)을 통과하기 위하여는 정전 협정에 따라 유엔사의 허가를 받아야 하는데, 정전협정은 유엔사의 허가를 받아야 한다고만 규정하고 있다. 대체로 유엔사 허가와 관련된 문제는 없었던 것으로 보이나, 2019. 6. 초순 유엔사가 강원도 고성군 보존 GP 방문을 불허하는 등 평화적 목적의 방문이 명백함에도 불허가하는 사례 들이 확인되는바, 본 글은 유엔사의 허가권에 법적인 한계가 없는지, 한계를 일탈한 불허가에 대한 사법적 구제수단이 있는지, 합리적 개선 방안이 있는지 살펴보았다. 먼저 본 글은 대한민국이 정전협정의 서명 당사자가 아니고 정전협정상 아무런 권한이나 책임이 없음에도 불구하고 대한민국에서 정전협정이 대한민국 헌법상 조약으로서 국내법과 같은 법적 효력을 가진다는 점을 검토하였다. 다음으로 유엔사 허가권의 범위에 대하여 보건대, 이승만 대통령이 유엔군 사령관에게 이전한 것은 ‘군사 지휘권’에 불과하므로 이에 기속되는 유엔사가 허가권을 행사할 수 있는 범위는 군사적 성격에 한정된다고 봄이 상당하다. 해석상으로도 ① 유엔사의 설치 근거인 유엔 안보리 결의 제84호가 ‘한국 방어를 지원하고 평화 유지와 회복’을 위한 것임을 명시 하는 점, ② 정전협정의 목적이 ‘순전히 군사적 성격’에 관한 것임이 분명한 점에 비추어 결국 유엔사는 오로지 군사적 성격에 한정되는 사안에 대하여만 권한을 부여받은 것이고, 적대행위를 유발할 위험이 없는 비군사적 통과는 허가권 행사의 대상이 아니므로 재량의 여지 없이 일의적으로 허가해야 한다고 봄이 타당하다고 사료된다. 그렇다면 유엔사의 평화적 방문에 대한 불허가는 한계를 일탈하였다고 할 것이다. 그럼에도 불구하고 현 단계에서 국가기관이 아닌 유엔사의 법적 지위에 비추어 자의적 불허가를 배제할 수 있는 유효 적절한 사법적 구제수단이 있다고 보기 어렵다. 결국 유엔사의 허가권이 수권된 범위 내에서 합리적으로 행사될 수 있도록 유엔사와 협의를 통하여 유엔사 규정 등 관련 법제를 정비하고, 최종적으로는 정전협정에서 예정한 평화적 해결에 부합하는 방향으로, 또한 1975년 유엔 총회 결의가 희망한 대로 정전협정을 평화협정 내지 새로운 협약으로 대체하는 것이 헌법 제3조와 제4조 합치적이라고 판단된다.

갑상선암의 초음파소견

김태헌 대한영상의학회 1989 대한영상의학회지 Vol.25 No.3

We analyzed 40 cases of high resolution US findings of thyroid carcinoma proven by surgical or needle biopsy. The results were as follows: 1. The incidence was predominent in female(M/F=1:5.6). 2. Recent increase of the tumor size or the size over 5cm accompanying mass effect upon adjacent structures(such as trachea) was proved as significant findings of malignancy. 3. The nature of the masses showed solid in 30 cases (75%) complex in 10 cases (25%) of which 5 cases(12.5%) were prodominently cystic. 4. The echo pattern of the masses was hypoechoic in 21 cases (70%) hyperechoic in 6 cases (20%) and isoechoic in 3 cases (10%) Heteropeneous in 23 cases(10%) Hemogeneus in 7 cases (18%) 5. Internal calcification of the masses were observed in 13 cases (32.5%) The nature of calcifications was small multiple irregular punctate in all cases. 6. Halo sign were present in 20 cases(50%) 7. Invasion of adjacent structures: Lymph node in 10 cases(25%) Muscles in 5 cases(12.5%) Trachea in 2 cases(5%) 8. The accuracy of preoperative sonographic diagnoisis was 62.5%s

수술 가능한(UICC T병기 1, 2 및 3), Child A인 간세포암 환자의 초기 치료로서 수술적 절제술과 경동맥 항암색전술의 생존율 비교

김태헌,이태림,이효석,김정룡,윤정환,우광훈,김강모 대한소화기학회 2000 대한소화기학회지 Vol.35 No.5

Background/Aims : This study was designed to compare the survival rates of patients with hepatocellular carcinoma (HCC) who were treated either with surgical resection (SR) or transarterial chemoembolization (TACE). Methods : From 1993 through 1994, 183 patients with HCC in UICC T1-3N0M0 and liver function of Child-Pugh class A were enrolled. The patients were divided into two groups (SR group and TACE group) according to the treatment modality. Stratification was performed according to the tumor stage (UICC or CLIP) and the degree of lipiodol retention. Survival rates of SR group and TACE group were compared. Results : When the both groups were stratified with UICC T stage, median survival of SR group and TACE group was 54 and 31 months, respectively, in UICC T1 HCC (p=0.0998), 65 and 37 months in T2 (p=0.0154), and 14 and 27 months in T3 (p=0.5432). In the stratification with CLIP stage, median survival of SR group was significantly longer in CLIP 0 or 1 HCC patients than that of TACE group. In the patients showing compact lipiodol uptake, median survival of SR group and TACE group in UICC T1 and T2 was 65 and 50 months (p=0.1529), and 65 and 48 months in CLIP 0 (p=0.1012), respectively. Conclusions : When compact lipiodol uptake is observed, repeated TACE may be as effective as surgery in patients with HCC of UICC T1, 2 or CLIP 0, as well as the patients with more advanced HCC.

임신 14주에 진단된 난소임신 1 예

김태헌,김종인,남동윤,이지민,배진곤 대한산부인과학회 2001 Obstetrics & Gynecology Science Vol.44 No.1

난소임신은 진단에도 많은 어려움이 있는 자궁외임신 중 희귀한 형태이다. Spiegelberg에 의해 진단기준이 기술되었는 데, 임신은 난소에 있어야 하고 난관을 침범하지 않아야 한다. 난소임신은 흔히 임신 1삼분기에 모성출혈을 일으키고, 응급수술을 필요로 하는 다량의 복강내 출혈을 일으킬 수 있으며, 황체출혈과 감별이 쉽지 않아 오진이 흔하다. 저자들은 난소임신 1례를 경험하였기에 간단한 문헌고찰과 함꼐 보고하는 바이다. Ovarian pregnancy is an uncommon form of ectopic gestation that is often difficult to diagnose. The diagnostic criteria were described in 1878 by Spiegelberg, which comprise that the pregnancy is in the ovary and does not involve the tube. Primary ovarian pregnancy results in maternal hemorrhage early in the first trimester, and is usually accompanied by rupture of ovary with hemoperitoneum to require emergency operation. Misdiagnosis is common because it is confused with a ruptured corpus luteum. One case of ovarian pregnancy was presented with a brief review of literatures.