미세혈관 감압술중 뇌간청각유발전위 감시장치의 유용성

김태준,고용,김영수,오성훈,김광명,오석전,Kim, Tae Joon,Ko, Yong,Kim, Young Soo,Oh, Seong Hoon,Kim, Kwang Myung,Kim, Nam Kyu,Oh, Suck Jun 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.5

Objective : Surgery for the microvascular decompression is mostly concerned with injury to the cranial nerves or brain stem by cerebellar retraction. Intraopeartive brain stem auditory evoked potentials(BAEPs) has been continuously monitored on surgery to evaluate the extent of injury, recovery of the nerves and prognosis. Methods : Of the 161 cases of CP angle surgery from Feb. 1996 to Apr. 1998, 103 cases were monitored during operation. Thirty five patients who had undergone similar surgery were selected and evaluated ; 23 patients were monitored and 12 were not during surgery. If monitor showed more than 0.5 mSec delay of latency, surgeon was given a warning not to retract brain any more. If more than 1mSec delay, surgeon was informed to stop surgery and wait for the returning of evoked potentials. The level of amplitudes and delay of latencies during the initial stage of operation, opening the dura, insertion of teflon patches, and closing the dura and recovery were then compared. Resuls : Twenty patients were male and 15 were female. Their average age was 50.26 years. Mean amplitude during the initial stage of operation was $0.60{\pm}0.25mV$, at opening the dura $0.56{\pm}0.26$, after teflon patches insertion $0.49{\pm}0.20$, and after closure of dura $0.47{\pm}0.28mV$. Mean latency during the early stage of operation was $6.08{\pm}0.67mSec$, at opening of dura $6.38{\pm}0.55$, insertion of teflon $6.97{\pm}0.59$, and closing the dura $6.17{\pm}0.54$. There was statistical significance in the difference of amplitudes between each procedures, and in the difference of latencies. For the complete recovery of amplitude and latency, it usually took average 5.65 minutes(0-20 min). In monitored group, only one patient required more than 20 minutes to recover and suffered from hearing disturbance after surgery. Others were recovered within 10 minutes without complications. However, 4 out of 12 patients who were not monitored showed hearing disturbance, and 1 patient had temporary facial palsy and dizziness(p=0.000). Conclusion : The results indicate that continuous intraoperative monitoring of BAEPs during CP angle surgery is seen mandatory procedure to prevent operative complications.

두경부암 환자의 방사선 치료시 자체 제작한 고정용구 (Shoulder Retractor)에 대한 유용성 평가

김태준,진선식,김동현,김동욱,정원규,김경태,Kim, Tae Jun,Jin, Sun Sik,Kim, Dong Hyun,Kim, Dong Wook,Chung, Weon Kuu,Kim, Kyoung Tae 대한방사선치료학회 2014 대한방사선치료학회지 Vol.26 No.1

목 적 : 본 연구에서는 두경부 암 환자의 방사선 치료 시 Neck node lower region까지 Target이 위치한 환자의 경우 기존의 상품화 된 두 가지 고정용구와 자체개발한 Shoulder Retractor의 유용성을 비교 평가하고자 한다. 대상 및 방법 : 본원에서 치료한 두경부암 환자 6명을 대상으로 사용한 고정용구의 종류에 따라 각각 2명씩 분류하여 좌, 우 Shoulder 위치변화와 Set up의 정확성을 OBI를 이용한 2D/2D 영상정합 위치보정 후 좌표 분석을 통해 비교하여 유용성을 확인해 보았다. 결 과 : 고정용구 종류에 따른 영상정합 위치보정 값(OBI A-P상 좌, 우 Shoulder 위치변화값)에 대한 평균값과 표준편차는 A그룹에서는 RT.Shoulder $1.07mm{\pm}3.99mm$, LT.Shoulder $-4.35mm{\pm}2.09mm$이고, B그룹에서는 RT.Shoulder $-0.37{\pm}5.91mm$, LT.Shoulder $1.26{\pm}5.28mm$, C그룹에서는 RT.Shoulder $-0.63{\pm}2.44mm$, LT.Shoulder $0.25mm{\pm}1.61mm$으로 나타났다. SET UP의 영상유도좌표 분석에서는 평균 및 표준편차 값이 A그룹에서 Vrt $-2.06{\pm}2.68mm$, Lat $-1.11{\pm}8.15mm$, Lng $0.34{\pm}3.78mm$, Rot $0.51{\pm}0.77^{\circ}$이고, B그룹에서 Vrt은 $-1.18{\pm}1.82mm$, Lat $-0.94{\pm}2.13mm$, Lng $-0.67{\pm}1.98mm$, Rot $0.91{\pm}1.04^{\circ}$이고, C그룹에서 Vrt은 $0.12{\pm}2.18mm$, Lat에서 $-0.79{\pm}1.62mm$, Lng에서 $-0.79{\pm}2.64mm$, Rot $0{\pm}0.49^{\circ}$으로 나타났다. 결 론 : 자체개발한 고정용구는 좌,우 Shoulder의 위치변화에 대한 재현성을 유지시킴에 있어 유용함을 알수있었고, 환자 변위요소(환자가 잡은 줄을 놓치는 현상과 발 끝의 위치와 모양에 따라 잡은줄이 한쪽으로 치우치는 현상)와 환자의 체중 변화로 인한 환자 자세의 고정문제를 줄임으로써 Set up의 오차를 줄이고 환자의 재현성을 유지시키는데 도움이 될 것으로 사료된다. Purpose : We compared the set-up accuracy and right-left Shoulder position variation of the manufactured device and other commercial shoulder-retractors in the head and neck radiation treatment. Materials and Methods : Six patients consist of three groups which were used three different Shoulder retractors. We measured position corrections of left and right Shoulder and the couch after the image guidance by using on board imager (OBI) for six head and neck patients who has the extended target to the neck node lower region. Results : The position variation correction of left (right) Shoulder after image guidance were $1.07{\pm}3.99mm$ ($-4.35{\pm}2.09mm$), $-0.37{\pm}5.91mm$ ($1.26{\pm}5.28mm$), $-0.63{\pm}2.44mm$ ($0.25{\pm}1.61mm$) for group A, B and C. The vertical, lateral, longitudinal position and angular corrections of the couch after image guidance were $-2.06{\pm}2.68$, $-1.11{\pm}8.15$, $0.34{\pm}3.78mm$, and $0.51{\pm}0.77$ degree for group A, $-1.18{\pm}1.82$, $-0.94{\pm}2.13$, $-0.67{\pm}1.98mm$, and $0.91{\pm}1.04$ degree for group B and $0.12{\pm}2.18$, $-0.79{\pm}2.64$, $0.79{\pm}2.64$, and $0.00{\pm}0.49$ degree for group C. Conclusion : In this preliminary study, we found the positioning accuracy of the manufactured Shoulder retractor is comparable to other commercial Shoulder retractors. We expect that the reproducibility and accuracy of the patient set-up could be improved by using the home made Shoulder retractor in the head and neck radiation treatment.

요통과 하지방사통에 대한 경막외 스테로이드 주입후 발생한 치명적 합병증 - 증례보고 -

김태준,김충현,정진환,백광흠,김재민,오석전,Kim, Tae Joon,Kim, Choong Hyun,Cheong, Jin Hwan,Bak, Koang Hum,Kim, Jae Min,Oh, Suck Jun 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.3

Epidural steroid injection(ESI) has been a commonly applied conservative therapy for the management of chronic low back pain and sciatica. However, there are many reports concerning various local, systemic and neurological complications related to ESI. We report two cases with fatal complications after ESI for low back pain and sciatica. In both patients, ventriculitis and meningitis were causative factors to be fatal. Aseptic procedures and careful post-procedure assessment are essential to avoid serious complications following ESI.

불규칙한 격자 위에서의 확산속도 지배반응에 대한 몬테 카를로 모의실험 연구

김태준,김형희,김효준,Kim, Taejun,Kim, Hyeonghee,Kim, Hyojoon 대한화학회 2012 대한화학회지 Vol.56 No.6

GEP 모형을 이용한 교각주위 국부세굴 예측

김태준,최병웅,최성욱,Kim, Taejoon,Choi, Byungwoong,Choi, Sung-Uk 대한토목학회 2014 대한토목학회논문집 Vol.34 No.6

물리현상의 난해성으로 인해 수학적인 관계식이 제시되기 어려운 경우 인공지능 기술에 근거한 다양한 기법이 적용되어 왔다. 수리학 분야의 대표적인 예로 교각주위 국부세굴 문제를 들 수 있다. 본 연구에서는 유전자 알고리즘의 진화된 방법인 GEP 기법을 이용하여 교각주위 국부세굴을 예측하는 방법을 제시하였다. 64개의 실험 자료를 이용하여 GEP 모형을 학습시켜 회귀식을 구축하였으며, 33개의 실험 자료를 이용하여 구축된 모형의 검증을 실시하였다. 평형세굴심 예측을 위하여 차원을 갖는 일반 변수와 표준화된 변수로 GEP 모형을 구축하여 예측 결과를 비교하였는데, 차원을 갖는 변수에 의한 GEP 모형이 세굴심을 더 잘 예측하는 것으로 나타났다. 구축된 GEP 모형을 두 가지 현장 실측자료에 적용하였다. 적용 결과, 실험 자료에 적용한 경우에 비해 예측의 정확도가 낮아지는 것을 확인하였다. 또한, 현장 실측자료를 이용하여 학습시킨 경우 실험 자료를 이용하는 경우 보다 예측 능력이 많이 향상되는 것으로 나타났다. GEP 모형의 적용성을 위해 ANN 모형과의 비교를 수행하였으며, 본 연구에서 사용된 GEP 모형이 교각주위 국부세굴 예측에 대하여 실내 및 현장 모두 ANN 모형보다 우수한 것으로 나타났다. Artificial Intelligence-based techniques have been applied to problems where mathematical relations can not be presented due to complicatedness of the physical process. A representative example in hydraulics is the local scour around bridge piers. This study presents a GEP model for predicting the local scour around bridge piers. The model is trained by 64 laboratory data to build the regression equation, and the constructed model is verified against 33 laboratory data. Comparisons between the models with dimensional and normalized variables reveals that the GEP model with dimensional variables predicts better. The proposed model is now applied to two field datasets. It is found that the MAPE of the scour depths predicted by the GEP model increases compared with the predictions of local scours in laboratory scale. In addition, the model performance increases significantly when the model is trained by the field dataset rather than the laboratory dataset. The findings suggest that apart from the ANN model, GEP model is a sound and reliable model for predicting local scour depth.

최적 레이턴시 기반 공정 큐잉 알고리즘의 대역폭 이용도

김태준,Kim, Tae-Joon 한국정보처리학회 2007 정보처리학회논문지 C : 정보통신,정보보안 Vol.14 No.2

널리 이용되고 있는 공정 큐잉 방식인 WFQ(Weighted Fair Queoing)는 특히 인터넷 전화와 같이 저속이지만 엄격한 지연한계를 요구하는 서비스에 대해 대역폭 이용도가 저하되는 고질적인 문제점을 갖고 있었다. 이러한 WFQ의 문제점은 흐름의 레이턴시가 최적화 되지 않았기 때문으로 최근에 밝혀졌고, 이어서 최적 레이턴시 기반 공정 큐잉 방식인 LOFQ(Latency-Optimized Fair Queuing)가 도입되었다. 그리고 LOFQ에 점유자원 최적화 기능을 추가하여 대역폭 이용도를 개선하고, 반복적으로 수행되던 자원변환 알고리즘을 개선하여 수행 복잡성을 줄이는 등 LOFQ의 성능특성이 향상되었다. 하지만 여전 시뮬레이션에 의해 성능을 평가하고 있어 평가의 정확성과 소요시간 측면에서 어려움이 있다. 따라서 본 연구에서는 LOFQ의 대역폭 이용도를 수학적으로 계산하는 방법을 연구하고자 한다. WFQ (Weighted Fair Queuing) is the most popular fair queuing algorithm, but it had the inherent drawback of a poor bandwidth utilization, particularly under the traffic requiring a low rate but tight delay bound such as internet phone, It was recently identified that the poor utilization is mainly due to non optimized latency of a flow and then LOFQ(Latency-Optimized Fair Queuing) to overcome the drawback was introduced, LOFQ was also improved through introducing an occupied resource optimization function and the implementation complexity of recursive resource transformation was reduced with revising the transformation scheme. However, the performance of LOFQ has been evaluated by means of simulation, so that there are some difficulties in evaluating the performance in the terms of the accuracy and evaluation time, In this paper, we develop how to analytically compute the bandwidth utilization in LOFQ.

XLPE 절연체의 등가 및 가변온도 가속열화실험을 통한 기계적 특성 비교 분석

김태준,황재상,정성훈,김태영,Taejoon, Kim,Jae-Sang, Hwang,Sung Hoon, Jung,Tae Young, Kim 한국전력공사 2022 KEPCO Journal on electric power and energy Vol.8 No.2

Recently, as the number of years of operation has increased for more than 30 years, interest in evaluating the remaining life of major power facilities such as transformers and ultra-high voltage cables is increasing. In particular, the risk of failure is increasing because the underground transmission XLPE cable has been built since 1980 and has been operating in excess of 30 years of design life or close proximity. Therefore, it is necessary to develop an algorithm to evaluate the residual life of the XLPE cable considering the load to determine the risk of failure. Since load data is large amount of data, it is necessary to make the variable load information equivalent to the time unit first in order to calculate the remaining life of the system quickly. In overseas literature, transformers are reported to be standardized for variable load equivalent conversion formulas, but they have not been reported for ultra-high voltage cables. Therefore, in this paper, whether the equivalent conversion formula of a transformer can be applied to XLPE cables was reviewed through accelerated degradation tests under equivalent and variable temperature conditions, and considerations were studied when evaluating the remaining operating life of XLPE cables based on the experimental results.

그 넉넉하고 풍요로운 고향의 추석 달

김태준,Kim, Tae-Jun 대한출판문화협회 1991 출판저널 Vol.91 No.-

RSVP-라우터간 가용자원 이동을 통해자원 이용 효율을 높이는 자원예약 방식

김태준,Kim, Tae-Joon 한국정보처리학회 2008 정보처리학회논문지 C : 정보통신,정보보안 Vol.15 No.4

서비스의 요구 품질을 보장하기 위해서 서비스의 트래픽 흐름 수용에 필요한 네트워크 자원을 예약해야 하며, 이를 위해 자원예약 프로토콜(RSVP)이 도입되었다. 그러나 경로상의 임의 RSVP-라우터가 자원부족으로 트래픽 흐름을 수락할 수 없으면 다른 RSVP-라우터에 아무리 여유자원이 많이 있다 해도 그 흐름을 수용할 수 없다. 이러한 문제를 해결하기 위해 본 논문에서 RSVP-라우터간 가용자원 이동을 통해 자원이용 효율을 높이는 자원예약 방식을 제안한다. 제안방식에서 RSVP-라우터는 최근에 연구된 최적 레이턴시 기반 공정 패킷 스케줄러를 사용한다. 평가 네트워크에 제안된 자원예약 방식을 적용한 결과 기존 방식에 비해 수용 흐름의 수를 최대 165%까지 개선할 수 있음을 확인하였다. Providing Quality-of-Service (QoS) guarantee requires the reservation of resource needed to accommodate the traffic flow of service for which resource reservation protocol (RSVP) was introduced. However, if any RSVP-capable router on the path fails to accommodate the traffic flow due to lack of resource, the flow is not allowed no matter how much surplus resources other routers on the path have. In order to solve this problem, this paper proposes a resource reservation method with available resource migration between RSVP-capable routers in which the routers use the recently developed latency optimized fair queuing scheduler. The results of the simulation applying the proposed method to an evaluation network show that it may yield the gain of up to 165% compared to that in the original one in terms of the number of admitted flows.

한방 치료로 호전된 만성 설염 치험 1례

김태준,곽병문,이유정,김희택,kim, Tae-Jun,Kwak, Byeong-mun,Lee, You-Jung,Kim, Hee-Taek 대한한방안이비인후피부과학회 2021 한방안이비인후피부과학회지 Vol.34 No.3

Objectives : The purpose of this study is to report the effectiveness of Korean medical treatments on chronic glossitis using Yanggyeok-sangagam based on tutakbeop(透托法), and Ikgibohyeol-tanggagam based on botakbeop(補托法) and bobeop(補法). Methods : We treated a 83-year-old female patient who had glossitis by Korean medicine and acupuncture treatment. These treatments were performed from 2020.8.4. to 2021.3.4. We have confirmed the improvement of white plaque like a pseudomembranous pattern lesion and pain. We recorded images that include change of symptoms. Results : After the treatments were done, the scores of numeric rating scale(NRS), oral assessment guide(OAG) and oral health impact profile-14(OHIP-14) were decreased. The NRS score was decreased from 7 to 1. The OAG score was decreased from 20 to 9. The OHIP-14 score was decreased from 34 to 5. Conclusions : According to the result, Korean medical treatments such as Korean medicine and acupuncture treatment, followed by the cure rules- tutakbeop(透托法), botakbeop(補托法) and bobeop(補法) can be effective for the treatment of chronic glossitis.