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정상인과 파킨슨병 환자에서 [I-123]IPT SPECT를 이용한 도파민 재섭취부위의 영상화
손형선,김의녕,이경진,나형균,손병철,최창락,Sohn, Hyung Sun,Kim, Euy Neyng,Lee, Kyung Jin,Rha, Hyung Keun,Son, Byung Chul,Choi, Chang Rhack 대한신경외과학회 2001 Journal of Korean neurosurgical society Vol.30 No.3
Objective : Dopamine transporter concentrations have been known to decrease in Parkinson's disease(PD). The aim of the present study was to evaluate the correlation between SPECT measurements of [I-123]N-(3-iodopropene-2-yl)-$2{\beta}$-carbomethoxy-$3{\beta}$-(4-chlorophenyl) tropane(IPT) as an imaging agent for measuring changes in transporter concentrations with PD. Patients and Methods : IPT labelled with $4.87{\pm}1.29mCi$($180.19{\pm}47.73MBq$) of [I-123] was intravenously injected into 23 patients(age : $58{\pm}12$) with PD and three normal controls(NC)(age : $37{\pm}7$) as bolus. Brain SPECT were then performed at 1 hour and 2 hours after injection on a double headed camera. The statistical parameters were the contrast ratio of left basal ganglia(BG) and right basal ganglia to occipital cortex(OCC) per milli curies of injected radiotracer at 1 hour and 2 hours. The correlations were evaluated between these parameters and Hoehn-Yahr classification of the patients. Results : The(BG - OCC)/OCC/mCi ratios at 1 hour and 2 hours for PD and NC were $0.14{\pm}0.07$ and $0.27{\pm}0.07$(1 hour) and $0.12{\pm}0.07$ and $0.34{\pm}0.04$(2 hour), respectively. The(BG - OCC)/OCC/mCi ratios of Parkinson's disease were decreased with higher grade of Hoehn-Yahr classification of the patients. The ratio between BG and OCC for PD were clearly separated from NC and may be useful outcome measures for clinical diagnosis. Conclusion : The findings suggest that IPT may be a very useful tracer for early diagnosis and treatment of PD and study of dopamine re-uptake site.
WLAN망 AP에서 사용자 인증과 자원관리 프로토콜의 구현 및 테스트
정선화 ( Sun-hwa Jung ),손형선 ( Hyung-seon Son ),박석천 ( Seok-cheon Park ) 한국정보처리학회 2005 한국정보처리학회 학술대회논문집 Vol.12 No.1
본 논문에서는 WLAN의 여러 가지 문제점을 해결하기 위해 WLAN망에서 유무선의 중계기 역할을 하고 있는 AP에 사용자 인증과 자원관리 기능을 지원하는 확장형의 AP를 제안하였다. 이를 위해 WLAN망 AP에서 사용자 인증과 자원관리 프로토콜의 메시지 및 동작 절차를 설계하고 구현하였다. 사용자 인증과 자원관리 프로토콜을 포함하고 있는 AP의 테스트를 위해 WLAN망에 구현한 두 대의 Main AP 및 Sub AP를 위치시키고, PC형 라우터를 통해 외부망과 연결하여 테스트망을 구축하였다. 이동단말과 테스트를 수행한 결과 본 논문에서 구현한 사용자 인증 모듈과 자원관리 모듈이 정상적으로 동작함을 확인하였다. 따라서 본 연구는 WLAN AP와 이동단말 간에 경제적이면서 신뢰적인 사용자 인증을 위한 기초 기반 기술로 활용될 수 있을 것으로 생각되며, WLAN 자원들을 효율적으로 관리하는데 일익을 담당할 것으로 사료된다.
파킨슨환자의 자기공명영상과 미세전극기록을 이용한 담창구 파괴술
이경진,손형선,박성찬,조경근,박해관,최창락,Lee, Kyung Jin,Son, Hyung Sun,Park, Sung Chan,Cho, Kyung Keun,Park, Hae Kwan,Choi, Chang Rak 대한신경외과학회 2001 Journal of Korean neurosurgical society Vol.30 No.1
Objective : The exact position of the lesion during the pallidotomy is critical to obtain the clinical improvement of parkinson's disease without damage to surrounding structure. Ventriculogrphy, CT(computed tomograpy) or MRI(magnetic resonance imaging) have been used to determine the initial coordinates of stereotactic target for pallidotomy. The goal of this study was to determine whether microelectrode recording significantly improves the neurophysiologic localization of the target obtained from MRI. Methods : Twenty patients were studied. They underwent a unilateral pallidotomy. Leksell frame was applied and T1 axial images parallel to the AC-PC(anterior commissure-posterior commissure) plane using a 1.5 Tesla MRI with 3mm slice thickness were obtained. Anteroposterior coordinate of target was chosen at 2mm in front of the midcommissural point and lateral coordinate between 19 and 22mm from the midline. The vertical coordinate was calculated on coronal slice using a fast spin echo inversion recovery sequence(FSEIR) related to the position of the choroidal fissure and ranged over 4-5mm below the AC-PC plane. Confirmation of the anatomical target was done on axial slices using the same FSEIR sequence . Microrecording was done at the pallidum contralateral to the symptomatic side using an electrode with a tip diameter of $1{{\mu}m}$ diameter tip and 1.1-1.4 mOhm impedance at 1000Hz. Electrophysiologic localization of the target was also confirmed intraoperatively by macrostimulation. Results : Microrecording techniques were reliable to define the transition from the base of the pallidum which was characterized by the disappearance of spike activity and by the change of the audible background activity. Signals from high amplitude neurons firing at 200-400Hz were recorded in the pallidal base. X, Y and Z coordinates of target obtained from the MRI were within 1mm from the X, Y, Z coordinates obtained with microrecording in 16 patients (80%), 15 patients(75%), 10 patients(50%) respectively. The difference of Y coordinate between on MRI and on microrecording was 4mm in only one patient. Conclusion : The MRI was accurate to localize the target within 1mm of the error from microrecording target in 70% of the patients. 4mm discrepancy was observed only once. We conclude that MRI alone can be used to determine the target for pallidotomy in most patients. However, microrecording technique can still be extremely valuable in patents with aberrant anatomy or unusual MRI coordinates. We also consider physiologic confirmation of the target using macrostimulation to be mandatory in all cases.
태전모반 (太田母斑) 에 대한 유전학적 ( 빈도를 중심으로 ) 및 임상적 연구
황선욱(Sun Wook Hwang),정태복(Tae Bock Chung),손형선(Hyung Son Sohn),김영표(Young Pio Kim) 대한피부과학회 1984 대한피부과학회지 Vol.22 No.1
The clinical observation was done on 126 patients of Ota's nevus, 113 of whom were seen at Department of Dermatology, Chonnam National University Hospital from January 1973 through July 1983, and 13 of whom were found among 45, 87l male and female students of high school in Kwangju City, Korea. The results obtained were as follows: 1. The incidence of male and female students of Ota's nevus were respectively 0. 013% and 0.043%, with the incidence,as a whole being 0.03%, whereas the frequency of Ota's nevus among the outpatients was 0. 24% with the ratio of male to female being 1: 2. 67. 2. There was only one family of familial occurrence, in which 2 sisters were involved among 5 siblings. 3. Thirty three percent of Ota's nevus showed the onset at birth. 4. According to Tanino's classification, our patients showed that Type II was 41.7% and then Type Ia, III, Ib, and IV being respectively 33. 3%, 16. 7, 4.2, and 4. 2%. 5. Seleral involvement was 54. 2%, especially in type III and Type II. 6. The color was increased in 54%, especially Type II by internal and external factors such as fatigue, warm temperature, menstruation and cold temperature. 7. The color intensification was prominent at the age of 10 to 14.
강대희(Dae Hee Kang),문선경(Sun Kyung Moon),손형선(Hyeong-Seun Son),박형도(Hyung-Do Park),김대진(Dae Jin Kim) 한국방송·미디어공학회 2023 한국방송공학회 학술발표대회 논문집 Vol.2023 No.11
최근 공사 현장에서 근로자 사망 등 안전사고의 지속적인 발생으로 인해 중대재해 처벌법 시행 등을 통한 공사 현장의 안전관리 지침과 사고방지를 위한 노력이 강화되고 있는 추세이다. 전기공사 및 건물공사 현장에는 높은 곳의 공사를 위하여 이동식 비계가 사용되고 있는데, 이때 추락 사고 등 중대 재해사고가 발생할 확률이 높다. 본 연구에서는 공사 현장에서 발생할 수 있는 안전사고를 방지하기 위해 이동식 비계에 AI 카메라를 설치하고 사람의 접근을 인식하여 알림을 울리는 방법을 제시한다. 그리고 사람 인식을 위한 실시간 영상 처리를 위해 Jetson Nano와 YOLOv5(You Only Look Once)를 이용한다. 또한 사람을 추론하는 시간을 단축하고 최소한의 메모리를 사용하는 인공지능 프레임 워크인 TensorRT의 사용을 통해, 이동식 비계의 안전을 향상하는 방안을 연구 개발하였다.
김영표(Young Pio Kim),나해철(Hae Cherl Nah),황선욱(Sun Wook Hwang),전인기(Inn Ki Chun),손형선(Hyung Son Sohn) 대한피부과학회 1984 대한피부과학회지 Vol.22 No.1
The hair growth of the scalp is influenced by many systemic and local factors. So the study of standard hair growth rate is very important for the diagnosis and treatment of some pathological conditions. That study has not been done well in Korea. The present study was to establish the standard hair growth rate of the scalp of healthy Koreans at different ages. The investigations were carried out on 509 individuals of both sexes whose ages ranged between 2 and 69 years. The subjects were grouped according to 5 age periods. The results of this study were as follows: 1. The mean value of the daily scalp hair growth rate was 0. 401+ 0. 037mm. 2. The daily hair growth rate of each groups were as follows: under 10 years of age; 0. 367+0.032mm, in the teenagers; 0.419,+0. 032mm, in the twenties0.398+0.037mm, in the thirties and fourties; 0. 394+0. 034mm, above 50 years of age 0. 386+029mm. 3. Sex differences of each age groups in the scalp hair growth were not statistically significant.
박성규(Sung Gyoo Park),최명규(Myung Gyu Choi),박수헌(Soo Heon Park),추교영(Kyo Young Choo),최황(Hwang Choi),김재광(Jae Kwang Kim),한석원(Sok Won Han),손형선(Hyung Sun Son),정규원(Kyu Won Chung),선희식(Hee Sik Sun) 대한소화기학회 2000 대한소화기학회지 Vol.36 No.3
Background/Aims : Scintigraphic test for gastric emptying has not been widely used as a screening test for gastric motility disorders in Korea. Our aim was to develop a relatively inexpensive, accurate test using selected scintigraphic observations. Methods: Scintigraphic scans after ingestion of an egg solid meal containing 99mTc-Amberlite pellets were performed for 21 healthy volunteers and 50 patients with suspected motility disorders. Gastric emptying was analyzed by power exponential analysis. We compared the accuracy of selected scans with traditional, more detailed approaches. Results : Lag phase was well correlated with gastric residuals at 30 min and 1 hour. Half gastric emptying time was well correlated with gastric residuals at 1 hour and 2 hours. Gastric residual at 30 min was more accurate for the diagnosis of rapid gastric emptying with sensitivity and specificity over 90%. Gastric residual at 2 hours was more accurate at detecting delayed gastric emptying with sensitivity and specificity over 90%. Conclusions: Selective scintigraphic scans taken at 30 min and 2 hours provide an excellent screening method for detecting abnormal gastric emptying with acceptable sensitivity and specificity. This strategy provides a simple, inexpensive way to evaluate gastric emptying in clinical practice. (Kor J Gastroenterol 2000;36:283 - 292)
지연용해형 캡슐내 방사선 비투과 표지자를 이용한 대장분절 통과시간
최황(Hwang Choi),최명규(Myung Gyu Choi),김병욱(Byung Wook Kim),김재광(Jae Kwang Kim),한석원(Sok Won Han),최규용(Kyu Yong Choi),정규원(Kyu Won Chung),선희식(Hee Sik Sun),박두호(Doo Ho Park),손형선(Hyung Sun Son) 대한소화기기능성질환·운동학회 2000 Journal of Neurogastroenterology and Motility (JNM Vol.6 No.1
N/A Backgrounds/Aim: Scintigraphic measurement of colon transit has proven usefu1 clinically and in the research area, however this method requires well equipped laboratories. The aim of this study was to develop a new colon transit test using radiopapue markers instead of radiolabeled pellets in a methacrylate-coated capsule. Methods: Ten healthy volunteer. were studied. After simultaneous administration of two methacrylate-coated gelatin capsules containing activated ehareoa1 mixed with 8 mCi of (99m)Tc or a commercially used radiopaque marker, scintigraphies and plain abdominal X-rays were performed. We compared colon transit profiles as the geometric center at 4, 8, 24, and 48 hours after ingestian of gelatin capsules. This new radiopaque marker test was validated with a scintigraphic method as the gold standard. Results: Geometric centers (mean±SEM) of (99m)Tc-scintigraphy were 0.50±0.18 at 4 hours, l.l6±0.05 at 8 hours, 3.31±0.36 at 24 hours, and 4.16±0.29 at 48 hours. Geometric centers of the radiopaque marker method were 0.40±0,16, 1.13±0.05, 3.33±0.37, and 4.18±0.30 respectively. Transit profiles were the same with both methods and highly correlated (r=0.994, p<0.001). The difference between the two methods against the mean for the geometric center was within 2SD. Conclusions : A colon transit test using radiopaque markers in a methacrylate-coated, delayed release capsule was inexpensive, simple, and reliable. This new test could be applicable when a gamma camera is not available. (Korean Journal of Gastrointestinal Motility 2000;6:52-60)
Technetium-99m sestamibi 스캔으로 진단된 종격동 부갑상선 선종 1예
이광우,손형선,송기호,손호영,차봉연,강성구,이성희,한원희 대한내분비학회 1996 Endocrinology and metabolism Vol.11 No.2
We present a patient with primary hyperparathyroidism in whom preoperative Tc-99m sestarnibi scanning cleary demonstrated mediastinal parathyroid adenoma. After resection of tumor through median sternotomy, he was restored to the normocalcemia. This case suggests that Tc-99m sestamibi scanning may be a useful method in the preoperative localization of mediastinal parathyroid adenoma(1 Kor Soc Endocrinol 11:227~232, 1996).