색상과 Chain Code를 이용한 내용기반 영상검색

정성호,이상렬,황병곤 한국정보전략학회 1999 추계공동학술대회 논문집 Vol.- No.01

본 논문에서는 영상의 내용을 나타내는 색상과 체인 코드에 기반한 복잡도와 영역 색 정보를 이용한 내용 기반 영상 검색을 결합한 시스템을 구현하였다. 실험 대상으로 선택한 꽃 영상의 경우 대부분의 인식 대상 객체가 중앙에 있을 경우를 고려하여, 영상을 중앙 영역과 전체 영역으로 구분하고, 각각의 영역에서 두 개의 히스토그램을 생성한다. 그리고 전체 영역에 대한 기준치를 구하고 chain code를 이용한 복잡도를 구하였다. 중앙영역과 전체영역의 히스토그램 인터섹션을 이용한 검색을 실험하였고, 영역 색상과 복잡도를 결합한 검색도 또한 실험하였다. 기존의 히스토그램 인터섹션의 경우 Precision/Recall이 0.34/0.60인데 비해 영역 색상 히스토그램을 인터섹션한 경우의 Precision/Recall은 0.69/0.76이고 복잡도를 결합한 경우의 Precision/Recall은 0.92/0.80를 얻음으로써, 제안된 방식의 검색이 비교적 효율적임을 보였다.

SSL 프로토콜의 성능 개선

정상곤,정전대,신재호 동국대학교 산업기술연구원 1998 산업기술논문집 Vol.11 No.-

본 논문에서는 SSL(Secure Socket Layer) protocol을 분석하고, 키를 재사용하는 SSL의 문제점을 개선하고, 공개키 알고리즘의 계산량에 대한 부하 없이 새로운 키를 생성하기 위해서 개선된 handshake protocol을 제안한다. SSL의 키 재사용은 키 값이 노출될 수 있는 위험성을 가지기 때문에 본 논문에서 제안한 프로토콜은 키 재사용을 안하면서도 서로의 인증이 필요없이 효율적인 키 변경이 가능하다. In this paper, we analyzed SSL(Secure Socket Layer) protocol. and we proposed an improved handshake protocol to make new key without computational load of public-key algorithm and to improve the problem that SSL reuse a key. This protocol prevents SSL from reusing a key and it need not mutual certification so it is more efficient than SSL handshake protocol.

악관절내장증을 동반한 Eagle's Syndrome

윤중호,김기정,정상훈,박광호,박정현,김형곤 大韓顎顔面成形再建外科學會 1994 Maxillofacial Plastic Reconstructive Surgery Vol.16 No.4

A thirty two year-old male was referred with a chief complaint of mouth opening limitation, and maxillofacial pain including left TMJ area. The patient had been treated in a private clinic with medications and conservative treatments, without any improvements in symptoms. MRI findings showed a limitations in condylar head movements, and signs of disc adhesion without the Positional change. Panoramic views showed elongation of stylohyoid process. Brain C-T was taken due to the patient's complaint of headache, facial pain, and paresthesia of tongue, and the result showed no abnormalities. The first surgery included meniscoplasty and the removal of disc adhesion of left TMJ under the preliminary diagnosis of internal derangement with adhesion, and the patient displayed marked improvements in opening movements despite of persistent hemiparesthesia of left facial areas and tongue, and mild dysphasia. Therefore, the second surgery was carried out with the preliminary diagnosis of Eagle's Syndrome, and a resolution of neurologic symptoms was obtained. The final diagnosis of this case was Eagle's Syndrome with internal derangement, and the difficulties in diagnosis and treatment might be due to the existence of two separate diseases with similar symptoms.

다중경로 환경에서 시공간 빔포머를 이용한 시스템의 채널 파라미터 부정합에 대한 성능 평가

김성곤,오정근,변건식 동아대학교 정보기술연구소 2003 情報技術硏究所論文誌 Vol.11 No.1

As a channel of a DS-CDMA system is shared among several users, the receivers face the problem of MAI. Also the bandlimited channel leads to ISI. Both components are undesired, but unlike the additive noise process, which is usually completely unpredictable, their space-time structure helps to estimate and remove them. This paper investigates a DS-CDMA system with a fading multipath channel. The investigations have been separated into a channel estimation part and a reception part. In the estimation part of separated two parts, the multipath parameters such as DOA and TOA are evaluated in this paper. In the part of receiver, we used these parameters and tested the performance of this receiver about space-time beamforrners(Decorrelating, Match-Filter, Wiener-Hopf, Subspace-Based). To assess many different estimation techniques and beamformers, the simulation compared with theoretical values is performed.

거푸집-동바리 시스템의 붕괴현황조사 및 원인분석

김곤묵,김호수,정성진,곽순섭 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

This study analyzes the defect causes under the investigation of collapse situation in form-shore system through the analysis of design criteria, loading and work conditions. Specifically, these defect causes can be classified as the three cases from the results of the investigation. Those are the external, design and construction defects which are closely related. So, one defect can induce another defect and this can lead to the collapse accident of form-shore system. Therefore, this study presents the improvement method to solve the problems relating to the design process and the actual construction application according to the defect causes.

알코올 의존 환자에서 갈근이 혈중 알코올 농도와 음주 효과에 미치는 영향

김명정,정영인,박제민,김성곤,최영길 大韓神經精神醫學會 1996 신경정신의학 Vol.35 No.6

갈근의 장기 투여가 혈중 알코올 농도와 음주 효과에 미치는 영향을 알아 보기 위하여 알코올 의존으로 입원하여 급성 알코올 중독과 금단 증상에서 회복된 남자 환자를 대상으로 갈근 투여군과 대조약 투여군으로 나누어 갈근과 대조약을 4주간 투여하였다. 갈근 혹은 대조약 투여 전후에 우울과 불안을 측정하고, 알코올 함량이 25%인 소주를 체중 kg당 ml를 음주하게 한 후 음주 전, 음주 후 10, 30, 60, 90, 120분에 각각 혈중 알코올 농도와 음주 효과를 측정하고 4주 동안의 일일 음식 섭취량을 측정하여 다음과 같은 결과를 얻었다. 1) 갈근 투여 전후 사이 그리고 실험군과 대조군 사이에 음주 후 혈중 알코올 농도에 유의한 차이가 없었다. 2) 갈근 투여 전에 비하여 투여 후에 음주 후 수축기 혈압은 음주 후 10, 30, 60, 90분에 그리고 이완기 혈압은 음주 후 10, 30, 60, 90, 120분에서 유의하게 낮았다. 갈근 투여 전의 수축기 혈압은 음주 후 10분에서 그리고 이완기 혈압은 음주 후 10, 30, 60분에서 음주 전에 비해 유의하게 상승하였으나 갈근 투여 후에는 알코올에 의한 위의 혈압 상승 효과가 차단되었다. 3) 갈근 투여 전에 비하여 투여 후에 운동량은 음주 60, 90분에서 유의하게 낮았고 목소리는 음주 후 10, 30, 60, 90분에서 유의하게 작았다. 갈근 투여 전의 운동량은 음주 후 10분부터 음주 전에 비하여 유의하게 상승하였으나 갈근 투여 후의 운동량은 음주 후 60분부터 유의하게 상승하여 알코올에 의한 상승 효과가 지연되었다. 4) 우울과 불안은 갈근 투여 전과 위약 투여 전 그리고 갈근 투여 후와 대조약 투여 후 간에는 유의한 차이가 없었다. 5) 음식 섭취량은 갈근 투여군과 대조약 투여군 모두에서 실험 기간 동안 유의한 변화가 없었다. Effect of radix puerariae on blood alcohol concentration and on alcohol effect in alcoholic patients was studied. The subjects were 57 hospitalized male alcoholics recovered from acute intoxication and withdrawal symptoms. They were divided into two groups of 29 subjects of experimental group and 28 control group. The experimental group was adminitrered with 10g/day of powder of radix puerarize and the control group with mixture of 4g/day of radix glycyrrhizae and 6g/day of flour for 4 weeks, respectively. Before and after treatment of the drugs, blood alcohol concentration, vital signs, and mania rating scale were measured at -5, 10, 30, 60, 90 and 120 minutes after administration of 25% alcohol at a dose of 6ml/kg b.w.p.o. The results were as follows: 1) Blood alcohol concentration was not changed by four weeks of radix puerariae treatment and no difference in the blood alcohol concentration was noted between the radix puerariae and the control groups. 2) Radix puerariae significantly lowered systolic blood pressures at 10, 30, 60 and 90 minutes after alcohol intake and diastolic blood pressures at 10, 30, 60, 90 and 120 minutes after alcohol intake as compared to the corresponding pre-treatment levels. Moreover, before radix puerariae treatment, alcohol-induced elevation of systolic blood pressure was significant at 10 minutes after alcohol intake and that of diastolic blood pressure was significant at 10, 30 and 60 minutes after alcohol intake. But after radix puerariae treatment, such elevation was abolished. 3) Radix puerariae reduced significantly levels of motor activity at 60 and 90 minutes after alcochol intake and levels of voice at 10, 30, 60 and 90 minutes after alcohol intake as compared to the respective pre-treatment levels. Alcohol-induced enhancement of motor activity was significantly increased from 10 minutes after alcohol intake before radix puerariae treatment. But after the drug treatment, it was significantly increased from 60 minutes after alcohol intake. Thus radix puerariae delayed the development of alcohol-induced enhancement of motor activity. 4) No significant differences were noted in the levels of anxiety and depression between the index group and the control, either before or after respective drug treatment. 5) Food intake was not changed during the experimental period in both groups.

배달 미니 게임 개발:"최고의 웨이터를 꿈꾸며"

김정훈,정한교,김영옥,김중곤,박정윤,윤진성,김경식 호서대학교 반도체제조장비국산화연구센터 2001 반도체장비학술심포지움 Vol.2001 No.-

본 미니 게임은 웨이터라는 직업을 모티브로 하여서 남녀노소 누구나 재미를 느낌과 동시에 기억력 향상시켜 주는 게임제작이라는 목적아래 제작되었다.본 논문에서는 이 게임의 제작과정을 기술하고자 한다.이 게임은 제3회 AGC(한국 아마추어 게임제작 공모전)에서 우수 작으로 선정되었다.

남성화 암쥐의 모리스 수중 미로 수행력 : 성에 따른 공간기억력과 테스토르테론 효과의 차이

신성현,박제민,정우영,박문일,서유나,김성곤,강철중 大韓神經精神醫學會 2007 신경정신의학 Vol.46 No.5

Objectives : It is widely accepted that gonadal steroids are involved in organization and activation of sexual dimorphism in the brain areas related with spatial leaming. This study aimed to test the following hypothesis : 1) spatial memory is affected by sex, 2) this difference is related with brain differentiation by exposure to testosterone in the neonatal period, and/or 3) the sexual difference of spatial memory is the result of the interaction between organization of sexual dimorphism in the brain and the circulating testosterone after growing up. Methods : Testosterone enanthate 100 ㎍, ('androgenized') orvehicle ('control') was randomly administered to 28 female and 25 male rat pups within 24 hour of birth. The escape latencies (EL) in Morris water maze were measured in 15 and 16 week of age with vehicle ('baseline') and with 10 μmol/kg of testosterone ('with testosterone'), respectively. Each session Consis-ted of 10 trials, and means of the last 5 trials were analyzed. Results : The baseline EL of the males were significantly shorter than females regardless ofneonatal exposure to testosterone. With testosterone, EL of the androgenized females were significantly shorter than control females and comparable to those of males. Conclusion : Neonatal exposure to testosterone in female rats may develop a tesosterone-dependent male-like spatial leaming system.

주산기 백서에서 혈중 에스트로겐 농도와 공간 기억력과의 상관관계

박민성,박제민,신성현,한귀원,김명정,김성곤 大韓神經精神醫學會 2006 신경정신의학 Vol.45 No.5

Objectives : This study was designed to find possible effect of pregnancy and parturition on spatial memory, especially in relation to levels of estrogen during the third trimester and postpartal period in rats. Methods : 25 female Sprague Dawley rats were divided into pregnant group (N= 14) and control group (N= 11). Changes in spatial memory during 6 weeks including third trimester and postpartal period were measured using Morris water maze. Time to reach the platform in the maze was indicator of spatial memory. Serum estrogen level was measured on 1 week before delivery, postpartal day 1, and day 14. Results : Both groups showed gradual improvement in performance by trial days and weeks, but no significant difference was found between the two groups. However in the third trimester, pregnant group showed a trend of less achievement on 3 days of learning than control group. Serum estrogen levels did not differ significantly between groups over the 6 weeks of period. However there was positive correlation between serum estrogen level on postpartum day 1 and time to reach platform on postpartum week 2, and negative correlation between estrogen level on postpartum day 14 and latency to the platform on postpartum week 5. Conclusion : These results imply that changes in the serum estrogen level may have dual effects on the spatial learning in peripartal period. It is suggested that decline in cognitive function might occur either by failure of rapid decrease of estrogen, immediately after parturition, or retarded restoration of estrogen in later postpartal period.

정신분열병 환자는 타인의 감정을 어떻게 지각하는가?

김명정,홍창희,김성곤 大韓神經精神醫學會 1992 신경정신의학 Vol.31 No.3

In order to evaluate perception of others' emotion in the schizophrenic patients, videotapes showing actors' emotional expressions of various kinds and intensities were shown to 41 male schizophrenic patients, 33 male alcoholics and 30 normal controls and their perception of the actors' emotion was measured and compared. The results are as follows : 1) The schizophrenic patients perceived the actor's unpleasant emotion as less unpleasant than the alcoholic patients and the normal controls. 2) The schizophrenic patients perceived the actor's neutral emotion as more pleasant than the alcoholic patients. 3) The schizophrenic patients perceived the actor's unpleasant emotion in short playing videotapes as less unpleasant than the alcoholic patients and the normal controls. 4) Above results were not related with duration of illness, duration of hospital stay and BPRS score of schizophrenic patients.