A Comparative Study on the Electrophysiological Properties of Medial and Lateral Spinoreticular Tract Cells in Cats

이석호,전제열,박춘옥,구용숙,김전,성호경,Lee, Suk-Ho,Jun, Jae-Yeol,Park, Choon-Ok,Goo, Yong-Sook,Kim, Jun,Sung, Ho-Kyung The Korean Physiological Society 1990 대한생리학회지 Vol.24 No.1

Vasomotor area로 알려져 있던 외측연수망상체는 최근 rostral ventrolateral medulla로 불리 면서 sympathoexcitatory neuron이 집중적으로 분포하는 연수내 부위로서, 체성교감신경반사에 중요한 역할을 하는 것으로 알려지고 있어 이 부위로의 입력정보가 그동안 많은 연구가 되어온 내측 척수망상로 세포와 어떤 차이를 보이는가를 규명하고자 하였다. 1) Medial SRT 세포는 34 cell중 약 60%가 동측으로 향하였으나, lateral SRT cell의 경우 47 cell의 약 60%가 반대측으로 향하였다. 2) 각 군의 세포를 말초자극에 대한 반응성에 따라, LT cell, Deep cell, HT cell및 WDR cell로 나누었으며 유해자극을 전달하는 세포를 HT와 WDR cell이라 하고, 무해자극을 전달하는 세포와 유해자극을 전달하는 세포의 비율로 볼 때, 다른 부위에 비하여 rostral VLM에 유해자극정보가 비교적 많이 전달됨을 볼 수 있었다. 3) 평균 전도 속도는 각 군간에 유의한 차이가 없었으나, Deep cell은 HT cell보다 유의하게 빠른 전도속도를 보였다. 4) Medial SRT 세포는 척수 회백질 내에서 Rexed laminae VII및 VIII에 주로 분포하며, LRN projecting SRT cell의 경우엔 전 lamina에 걸쳐 고루 분포하였다. 이상의 결과는 내측 및 외측 망상체간의 말초 입력 정보의 차이를 보여주고 있으며, 연수 망상체의 세 부위중 특히 rostral ventrolateral medulla로 많은 동통정보가 입력되고 있어 RVLM의 기능중 하나인 체성교감반사의 통합과 연관된 역할을 하리라 기대된다. Antidromically activated spinoreticular tract (SRT) cell units in the lumbosacral enlargement of ${\alpha}-chloralose$ anesthetized cats were classified as medial and lateral SRT units according to the location of their axonal termination. Identified SRT units were tested fer antidromic conduction velocity, laterality of their axonal projection, the location in spinal gray, peripheral receptive field, the response pattern to graded mechanichal stimulation and the responsiveness to $A{\delta}$ and C volley of the peripheral nerve. 1) The 59% of 34 medial SRT units were recorded in ipsilateral side to the antidromic stimulation site, but 60% of the 47 lateral SRT units projected to contralateral side. 2) Most of the medial SRT cells and rostral ventrolateral medulla (RVLM)-projecting lateral SRT cells were recorded in lamina VII & VIII. The LRN (lateral reticular nucleus)-projecting SRT cells, however, distributed through all the laminae except superficial ones (I & II). 3) The identified SRT units were classified as low theshold (LT), deep, high threshold (HT), wide dynamic range (WDR) cells, based on the response patterns to graded mechanical stimuli. The proportion of SRT units which receive noxious input was 37.5%, 25% and 75% in the medial, LRN-projecting and RVLM SRT group, respectively. 4) There was no significant difference in the mean conduction velocities between the 3 groups. But the deep cells had significantly higher velocity than that of the HT cells. The above results show that the peripheral inputs to the SRT units are different in the 3 groups: medial, LRN & RVLM SRT group. Especially in case of the SRT cells projecting to RVLM which is a probable candidate fur the integration center of various pressor reflexes such as somatosympathetic reflex, the noxious informations occupy higher proportion of input to them than in other groups. Therefore the noxious information transmitted through the lateral SRT destined for RVLM is expected to play a role in somatosymapthetic reflex.

CCTV 개인영상 정보보호를 위한 오프라인 객체추적

이석호,Lee, Suk-Ho 한국정보통신학회 2014 한국정보통신학회논문지 Vol.18 No.12

최근 CCTV의 영상정보 공개시 타인의 영상에 대해서는 모자이크 처리하여 식별이 불가능하도록 하는 개인정보 보호법이 발표되었다. 반면에 CCTV를 통하여 획득된 영상 데이터를 활용한 범죄 수사는 점차 더 많이 활용되고 있는 추세이다. 이렇게 상반된 2가지의 요구사항에 의해 촬영된 CCTV 동영상을 수사기관 등의 기관에서 요청할 경우 개인정보(개인 얼굴 이미지 등)을 마스킹(Masking)해 배포함으로써 개인정보 유출을 차단하는 마스킹/ 언마스킹 솔루션에 대한 시장의 요구가 크게 성장할 것으로 예측된다. 정보주체가 정보열람 의뢰기관에 정보를 요구하기 전에 객체에 대한 선별 마스킹을 하기 위한 정보보호 솔루션에 있어서 가장 핵심되는 기술은 객체에 대한 추적기술이다. 본 논문에서는 CCTV영상에 대한 후처리로써의 정보보호 솔루션에 적합한 객체추적 알고리즘을 제안한다. 안정적인 추적이 가능하도록 하기 위해 움직임정보와 색상정보를 함께 사용하였다. 그러면서도 시간이 많이 걸리지 않는 컬러 중심점 이동(Color Centroid Shifting) 기반의 방법을 사용하여 추적의 속도 성능을 높였다.

대장직장암에서 임상조직학적 소견과 DNA ploidy와의 상관관계

이석호,김헌정,김우철,조영갑,노준규,우제홍,황태숙,Lee Suk Ho,Kim Hun Jung,Kim Woo Chul,Cho Young Kap,Loh John J K,Woo Ze Hong,Hwamg Tae Sook 대한방사선종양학회 2000 대한방사선종양학회지 Vol.18 No.3

Purpose : DNA ploidy pattern was shown to correlate with several clinicohistologic findings in several tumors. Aim of this study was to evaluate the correlation of the clinicohistologic findings in colorectal cancer and the failure pattern in rectosigmoid cancer with DNA ploidy. Materials and Methods DNA flow cytometry using the Hedley methods on paraffin embedded specimen from 117 patients with colorectal cancers after curative resection was peformed. We tried to find the correlation between DNA ploidy and various clinicohistologic findings. And then the correlation DNA ploidy and the failure pattern in 75 patients of rectosigmoid cancer was analized. Results : Forty samples (34.2%) from tumors gave aneuploidy histogram. There was no significant difference in the frequency of DNA aneuploidy in terms of age, sex, depth of invasion, location and Dukes stage. But there was a significant correlation between DNA ploidy and the failure rates in Dukes stage B rectosigmoid cancer (P=0.048). Conclusions : These findings suggest that DNA ploidy pattern shows the correlation with the treatment failure rates in Dukes stage B rectosigmoid, but not with many other clinicohistologic findings. However,more patients will be needed to disclose these findings.

PTMSP-Borosilicate 복합막에 의한 수소-질소 기체 분리에 관한 연구

이석호,강태범,Lee, Suk Ho,Kang, Tae Beom 한국막학회 2014 멤브레인 Vol.24 No.6

The amorphous and porous borosilicate without any cracks was obtained under the following condition : 0.01~ 0.10 mole ratio of trimethylborate (TMB)/ tetraethylorthosilicate (TEOS) and the temperature of $700{\sim}800^{\circ}C$. According to the BET and SEM measurements, borosilicate heat-treated in between 700 and $800^{\circ}C$ showed the surface area of $251.12{\sim}355.62m^2/g$, the pore diameter of 3.5~4.9 nm, and the particle size of 30~60 nm. According to the TGA measurements, the thermal stability of poly[1-(trimethylsilyl)propyne](PTMSP) membrane was enhanced by inserting borosilicate. SEM observation showed that the size of dispersed borosilicate in the composite membrane was $1{\mu}m$. The results showed that the permeability of $H_2$ and $N_2$ increased and the selectivity of $H_2/N_2$ decreased upon the addition of borosilicate into PTMSP membranes. Addition of borosilicate may possibly increase the free volume, cavity and porosity of membranes indicating that permeation occurred by molecular sieving, surface and Knudsen diffusion rather than solution diffusion of gases.

PDMS-SiO₂·B₂O₃ 복합막에 의한 수소-질소 기체 분리

이석호,강태범,Lee, Suk Ho,Kang, Tae Beom 한국막학회 2015 멤브레인 Vol.25 No.2

$SiO_2{\cdot}B_2O_3$ was prepared by trimethylborate (TMB)/tetraethylorthosilicate (TEOS) mole ratio 0.01 at $800^{\circ}C$. PDMS[poly(dimethysiloxane)]-$SiO_2{\cdot}B_2O_3$ composite membranes were prepared by adding porous $SiO_2{\cdot}B_2O_3$ to PDMS. To investigate the characteristics of PDMS-$SiO_2{\cdot}B_2O_3$ composite membrane, we observed PDMS-$SiO_2{\cdot}B_2O_3$ composite membrane using TG-DTA, FT-IR, BET, X-ray, and SEM. PDMS-$SiO_2{\cdot}B_2O_3$ composite membrane was studied on the permeabilities of $H_2$ and $N_2$ and the selectivity ($H_2/N_2$). Following the results of TG-DTA, BET, X-ray, FT-IR, $SiO_2{\cdot}B_2O_3$ was the amorphous porous $SiO_2{\cdot}B_2O_3$ with $247.6868m^2/g$ surface area and $37.7821{\AA}$ the mean of pore diameter. According to the TGA measurements, the thermal stability of PDMS-$SiO_2{\cdot}B_2O_3$ composite membrane was enhanced by inserting $SiO_2{\cdot}B_2O_3$. SEM observation showed that the size of dispersed $SiO_2{\cdot}B_2O_3$ in the PDMS-$SiO_2{\cdot}B_2O_3$ composite membrane was about $1{\mu}m$. The increasing of $SiO_2{\cdot}B_2O_3$ content in PDMS leaded the following results in the gas permeation experiment: the permeability of both $H_2$ and $N_2$ was increased, and the permeability of $H_2$ was higher than $N_2$, but the selectivity($H_2/N_2$) was decreased.

실시간 ELSAC을 이용한 Stop/Go 방식의 Pan/Tilt 카메라 시스템

이석호,Lee, Suk-Ho 한국방송∙미디어공학회 2012 방송공학회논문지 Vol.17 No.6

The stability of object tracking in non-stationary camera environment, such as intelligent surveillance system using a pan/tilt camera, is less stable compared with stationary camera environment. This is due to the fact that it is difficult to model a background image in non-stationary environment. In this letter, we propose a non-stationay pan/tilt camera surveillance system which uses a stop/go procedure together with a real-time active contour. The proposed system can track the object stable even in an environment where only a few difference frames can be obtained.

PTMSP/PDMS-Borosilicate 복합막에 의한 수소-질소 기체 분리에 관한 연구

이석호,이현경,Lee, Suk Ho,Lee, Hyun Kyung 한국막학회 2015 멤브레인 Vol.25 No.2

The PTMSP/PDMS graft copolymer were synthesized from the PTMSP[poly(1-trimethylsilyl-1-propyne)] and the PDMS[poly(dimethylsiloxane)] and then the PTMSP/PDMS-borosilicate composite membranes were prepared by adding the porous borosilicates to the PTMSP/PDMS graft copolymer. The number-average molecular weight (${\bar{M}}_n$) and the weight-average molecular weight (${\bar{M}}_w$) of PTMSP/PDMS graft copolymer were 460,000 and 570,000 respectively, and glass transition temperature ($T_g$) of PTMSP/PDMS graft copolymer appeared at $33.53^{\circ}C$ according to DSC analysis. According to the TGA measurements, the addition of borosilicate to the PTMSP/PDMS graft copolymer leaded the decreased weight loss and the completed weight loss temperature went down. SEM observation showed that borosilicate was dispersed in the PTMSP/PDMS-borosilicate composite membranes with the size of $1{\sim}5{\mu}m$. Gas permeation experiment indicated that the addition of borosilicate to PTMSP/PDMS graft copolymer resulted in the increase in free volume, cavity and porosity resulting in the gradual shift of the mechanism of the gas permeation from solution diffusion to molecular sieving surface diffusion, and Knudsen diffusion. Consequently, the permeability of $H_2$ and $N_2$ increased and selectivity ($H_2/N_2$) decreased as the contents of borosilicate increased.

한국인에서 네 번째 발병된 장카필라리아증 1예

이석호(Suk Ho Lee),이풍렬(Poong Lyul Rhee),이준혁(Joon Hyoek Lee),이규택(Kyu Taek Lee),이종균(Jong Kyun Lee),심상군(Sang Gun Sim),이상구(Sang Ku Lee),김재준(Jae Jun Kim),고광철(Kwang Cheol Ko),백승운(Seung Woon Paik),이종철(Jong Chu 대한소화기학회 1999 대한소화기학회지 Vol.34 No.4

Intestinal capillariasis is caused by Capillaria philippinensis. Among them, only 4 species have been found in humans: Capillaria hepatica, C. aerophila (Eucoleus aerophilus), C. plica and C. philippinensis. Reports of human infections with C. hepatica, C. aerophila and C. plica are rare, but reports of C. philippinensis infections are increasing and spreading geographically. Human infestation by C. philippinensis is a rare parasitic disease. We experienced a case of intestinal capillariasis which was misdiagnosed for intestinal tuberculosis or Crohn's disease at first but correctly diagnosed later by detection of numerous eggs of C. philippinensis on the stool examination. The eggs were found in stool only after ingestion of prednisolone for treatment of misdiagnosed Crohn's disease. The 42 year-old patient had a journey to Saipan island in Pacific ocean 6 months ago and ate sliced raw eels. Abdominal pain, watery diarrhea were subsided after therapy of albendazole. (Kor J Gastroenterol 1999;34:542 - 546)

Cox proportional hazard model을 이용한 보험사 파산 예측

이석호 ( Suk Ho Lee ) 보험연구원 2007 보험금융연구 Vol.18 No.1

본 연구의 목적은 logit model을 사용한 기존 Lee(2005)의 연구 결과를, 즉 효율성 변수가 손보사 파산의 중요한 예측 변수인지, 그리고 이들 효율성 변수들이 보험사 파산 예측 모델에서 기존에 주로 사용되어졌던 재무변수들의 설명력과 분별력을 증진시키는지의 여부를 다른 파산예측 모델인 Cox proportional hazard model을 이용하여 검증·확인하는 데에 있다. 본 연구의 결과, 효율성 변수가 보험사 파산의 중요한 예측 변수이고, 재무변수들의 설명력을 증진시키는 것으로 확증되고 있다. 본 연구의 또 하나의 의의로서, 보험사 파산예측에서는 본 연구가 처음 시도하는 것이지만, 사회과학, 생물의학 등의 분야 및 은행 파산예측에서 이미 효과적인 모델로 판명된 Cox proportional hazard model이 보험사 파산예측에서도 유용한 모델이 되는 것으로 나타나고 있다. 향후 보험사 파산예측에서 logit model과 Cox proportional hazard model, 그리고 기존 재무변수들에 효율성 변수가 결합된다면 보다 의미 있는 결과가 도출될 것으로 기대되어 진다. Using another useful statistical model for failure prediction, which is the Cox proportional hazard model, this study attempts to verify and confirm the results of Lee(2005). The results of this study support most of the findings of Lee(2005). In other words, under the frame of the Cox proportional hazard model like the logit model, efficiency measures has tuned out to be important factors in identifying and forecasting insurer insolvencies again. Also, the results of the study support another finding of Lee(2005) that the efficiency variable sets add significant explanatory power to the financial ratio variable sets. Meanwhile, this study also finds that overall, the Cox proportional hazard model has comparable ability to the logit model in identifying and forecasting insurer insolvencies. In the sense that both logit and Cox proportional hazard model convey important information regarding insolvency of property-liability insurers, the combined use of both statistical models in identifying and predicting insolvency of insurers would be desirable. And its performance should be improved with the inclusion of efficiency measures as explanatory factors into the model.

차량용 강우센서의 Signal을 이용한 관측강우 관계식 개발

이석호 ( Suk Ho Lee ),김병식 ( Byung Sik Kim ) 한국농공학회 2017 한국농공학회 학술대회초록집 Vol.2017 No.-

차량용 강우센서는 강우에 따라 와이퍼의 동작 속도를 제어하기 위해 만들어졌다. 따라서 강수의 크고 적음을 대략적으로 판단하여 와이퍼의 속도단계를 결정하기 위한 장치이다. 차량용 강우 센서는 동작원리는 송수신되는 광신호에 기반한다. 일반적인 강우관측기와 달리 물 입자가 커질수록 빛의 산란이 크게 일어나는 현상을 이용한다. 산란이 크게 일어나면 강우 센서에 수광부의 광신호 값이 줄고 이는 강수가 높다는 것을 의미한다. 따라서 센서의 감지신호(Signal)와 실제강우(R)과의 관계를 이용하여 강우량으로 환산할 수 있는 R-S관계식을 개발하였다. 센서의 감지 신호(Signal)를 강우량으로 환산하기 위하여 실내 강우발생 실험 장치를 이용하여 일정 강우(R)를 증가시키고 그때 발생된 센서 감지량(S)의 관계를 수치적으로 분석하여 상관식을 만들었으며 실제 AWS, 자기우량계와 비교 분석하였디.