SGCI 材料의 Casting 및 磨滅强度에 關한 硏究

김성주,문형태,최익수,노무근 三陟大學校 産業科學技術硏究所 2003 産業科學技術硏究論文集 Vol.8 No.2

In order to collect the basic data for the production of nodular cast iron requiring wear resistance. the mechanical nature such as structure analysis, hardness, and tensile strength were performed on cast sample by changing residual Mg concentration of cast iron at the range of 0∼0.052% and also the wear characteristics were examined through wear test by changing abrasion speed and final load. As a result, the following conclusions were drawn. The wear amount rapidly accelerates to the maximum abrasion sped of 2.3m/sec in a sample without Fe-Si-Mg alloy processing(residual Mg amount; 0%) by increasing the abrasion speed from 1.3m/sec to 2.3m/sec. As the Mg residual Mg contents increases, the ratio of nodular increases while hardness of a sample accelerates and the wear amount decreases. The maximum point moved to the high speed side in a sample with 0.043% residual Mg contents and the wear amount showed the maximum in 3.5m/sec of abrasion speed while a sample with 0.052% residual Mg contents showed the mechanical destruction wear to 4.3m/sec abrasion speed. The more residual Mg contents are in 0.6-l.1m/sec low speed range of abrasion speed, the more wear amount was resulted while the less residual Mg contents were. the less wear amount showed. Oxidation wear occurs at 4.5m/sec of traveling velocity. Since the wear of matrix structure occurs after wear of oxidized substance in friction caused by oxidized substance, the wear amount shows less than 2.3mg/sec traveling velocity. Therefore, as the residual Mg contents increase, the wear amount decreases. Although the wear amount is large since the traveling distance of destruction wear lasts very long. the residual Mg contents are small and the oxidation wear area becomes long in a sample with low hardness. Since the mechanical destruction wear occurs when the traveling &stances reaches to the end, the wear amount results in very small. The scratches appeared due to abrasive wear in mechanical destruction wear with 2.3/sec abrasion speed while it did not show in oxidation wear although the severe wear occurred. The sectional melting appeared in 5.4m/sec of high speed friction since the temperature of contact point increased more than 1000℃. Scratches are less in the area with low load and if load increase, shoving occurs in wear grooves. In the maximum load, the severe cracking phenomenon can be observed.

지형학적 청각 사건관련전위 P300 요소들의 결정방법

한상익,전양환 大韓神經精神醫學會 1998 신경정신의학 Vol.37 No.1

목 적 : 본 연구는 지형학적 청각사건관계전위 P300 요소들을 결정하는 방법들을 비교하기 위함이다. 방 법 : 44명의 정상인과 DSM-Ⅳ에 근거한 44명의 정신분열증 환자를 대상으로 하였다. 지형학적 청각사건관련전위 P300은 oddball paradigm으로 기록하였다. 잠복기, 전위, 그리고 X-Y 좌표에 따른 최대전위 위치 등을 포함한 P300요소들은 전산화된 Brain Mapping기기를 사용하였다. P300 잠복기는 global field power measurement와 고전적 방법으로 결정하였다. 결 과 : 잠복기(DF=1, F=35.28, P=0.0001)와 전위(DF=1, F=36.62, P=0.0001)에서 두 군간에 차이가 있었으나, X 좌표(DF=1, F=0.37, P=0.55)와 Y 좌표(DF=1, F=2.00, P=0.16)에서는 차이가 없었다. 잠복기(DF=1, F=0.04, P=0.85), 전위(DF=1, F=0.07, P=0.79), X 좌표(DF=1, F=0.07, P=0.79), Y 좌표(DF=1, F=0.03, P=0.86)에서 두 방법간에 차이가 없었다. 결 론 : 이 결과는 지형학적 청각사건관계전위 P300의 요소들을 결정하는 두 방법이 현재까지는 연구 및 임상 적용에 유용함을 시사한다. Objects : This study was designed to make a comparison between methods to determine the components of topographic auditory event related potential P300. Methods : The subjects were consisted of 44 normal controls and 44 patients with schizophrenia diagnosed by DSM-Ⅳ. The topographic auditory event related P300 was recorded in oddball paradigm. The components of P300, including latency, amplitude, and location of maximum amplitude in X-Y coordinates, were analyzed by computerized EP mapping system. The latency of P300 was determined by both global field power measurement and classic method. Results : There was difference between two groups in latency(DF=1, F=35.28, P=0.0001)and amplitude(DF=1, F=36.62, P=0.0001), but not in X coordinate(DF=1, F=0.37, P=0.55) and Y coordinate(DF=1, F=2.00, P=0.16). There was no difference between two methods in latency(DF=1, F=0.04, P=0.85), in amplitude(DF=1, F=0.07, P=0.79), in X coordinate(DF=1, F=0.07, P=0.79), and in Y coordinate(DF=1, F=0.03, P=0.86). Conclusion : The results suggested that two methods to determine the components of topographic auditory event related potential P300 should be available for both research and clinical application to date.

패밀리 셋업이 존재하는 병렬기계 일정계획 수립

권익현,신현준,엄동환,김성식 한국경영과학회 2005 한국경영과학회지 Vol.30 No.1

This paper considers identical parallel machine scheduling problem. Each job has a processing time, due date, weight and family type. If a different type of job is follow by prior job, a family setup is incurred. A two phased heuristic is presented for minimizing the sum of weighted tardiness. In the first phase, using rolling horizon technique, group each job into same family and schedule each family. In the second phase, assign each job to machines using schedule obtained in the first phase. Extensive computational experiments and comparisons among other algorithms are carried out to show the efficiency of the proposed algorithm.

'1998 한국인 우울증 선별의 날' 참가자들의 사회인구통계학적 특성과 우울증 선별검사 결과

한상익,이성필,고효진,박원명,장계호,유태열,전태연,채정호,방승규,김광수,최보문,이정태,백인호 大韓神經精神醫學會 1999 신경정신의학 Vol.38 No.5

연구목적 : 1998년 정신건강의 날 기념 한국인 우울증 선별의 날 행사에 자발적으로 참여한 참가자들의 사회인구 통계학적 특성을 분석하고 우울증 선별검사 결과를 평가하기 위하여 본 연구를 시행하였다. 방 법 : 8개 병원에서 얻어진 619명의 자료를 사용하여 선별검사로 밝혀진 우울증의 유병율과 사회인구통계학적 특성 및 응답자의 정신과적 치료를 포함한 과거력 등을 조사하였다. 결 과 : 우울증 척도 점수는 응답자 전체 평균 57.5±13.8로 경도의 우울 증상이 있는 것에 해당되었다. 전체 응답자의 69.5%(430명)가 최소한 경도 이상의 우울 증상을, 43.1%(267명)가 중등도 이상의 우울 증상을, 18.4%(114명)가 고도의 우울 증상을 보였다. 고도의 우울 증상이 있는 응답자의 56.8%와 중등도의 우울 증상이 있는 응답자의 63.9%가 정신과 치료를 받은 적이 전혀 없었다. 나이가 29세 이하인 것과 전임근무 중인 직업상태는 각각 나이가 60세 이상인 것과 직업이 없는 것에 비교하여 우울증으로부터 보호하는 인자임을 시사하였다. 결 론 : '1998 한국인 우울증 선별의 날' 행사를 통하여 많은 우울증 환자들을 선별해낼 수 있었고, 이들의 우울 증상은 몇몇 사회인구통계학적 특성과 유의한 관계가 있음을 확인하였다. 우울증 선별의 날 행사를 통한 우울증에 대한 교육과 우울증 선별검사는 치료받지 못하고 있는 우울증 환자 및 기존의 치료 중인 환자 모두에게 유용한 프로그램임을 알 수 있었다. Objectives : This study was performed to analyze the sociodemographic characteristics of participants in '1998 Korean Depression Screening Day' and to evaluate the results of the screening test. Methods : By using the survey results of 619 volunteers from 8 hospitals, the authors examined the prevalence of depression detected at the screening test and sociodemographic characteristics and the psychiatric treatment history of respondents. The assessment measure was the Zung Self-Rating Depression Scale. Results : The mean depression score of all participants was 57.5±13.8 and it came under mild depression. Of all participants, 69.5%(N=430) had at least mild depressive symptoms, 43.1%(N=267) had at least moderate symptoms, and 18.4%(N=114) had severe symptoms. Never have 56.8% of respondents in the severely depressed range and 63.9% of those in the moderately depressed range had psychiatric treatment. The results suggest that the age group of 29-year-old or younger(relative to 60-year-old or older group) and full-time employment status(relative to unemployment) are protective factors of depression. Conclusions : By '1998 Korean Depression Screening Day', many depressed patients were detected and their depressive symptoms had statistically significant relationships with some sociodemographic characteristics. The results suggest that the education and screening test programs for depressive illness facilitated by Depression Screening Day are useful to the patients regardless of being under current treatment or not.

鑄鐵材料의 Melt Treatment 및 Carbon Contents에 關한 硏究

최익수,김성주,문형태,노무근 삼척대학교 산업과학기술연구소 2001 産業科學技術硏究論文集 Vol.6 No.1

It is the purpose of this study to investigate the melt treatment and properties of cast iron by varifying the holding time after inoculation treatment and carbon contents. The main results obtained by investigating the microstructure and carbon contents are as follows : The number of graphite in cast iron decreases by increasing the holding time of melts after inoculation treatment, and the coarsening of graphite is achieved by increasing the length and thickness of graphite. As the carbon contents increase in cast iron, the shape and size of graphite in cast iron structure increase continuously.

알코올의존 환자에서 알코올이 뇌파, 사건관련전위 P300 및 인지기능에 미치는 영향

한상익,전양환,이창욱 大韓神經精神醫學會 2000 신경정신의학 Vol.39 No.5

연구목적: 저자들은 알코올의존 환자들을 대상으로 뇌파, 청각사건관련전위 P300등 신경생리학적 검사와 신경 인지기능 검사를 실시하여 알코올이 뇌기능에 미치는 영향을 확인하고자 본 연구를 시도하였다. 방법: 알코올의존 환자군 33명과 정상 대조군 67명을 대상으로 하였다. P300의 잠복기를 고전적 방법, Glo-bal Field Power 방법, 그리고 기존의 방법을 변형시킨 수정된 방법 등 세 가지로 결정하였으며 다른 검사값들과의 비교는 Global Field Power방법으로 측정한 결과를 사용하였다. 지능검사는 한국판 웩슬러 지능검사를 사용하였고 웩슬러 기억검사와 Trail Making B검사를 이용하여 신경인지기능을 평가하였다. 뇌파분석은 주파수 영역별로 델타파(δ, 1-3.5Hz), 세타파(θ,4-7.5Hz), 알파파(α,8-13Hz),베타파(β,13.5-18Hz)의 4개 구역으로 나눈 후 상대적 Power로 분석하였다. 결과: P300 은 환자군에서 작고 늦게 나타났으며 측정 방법에 의한 차이도 없었다. 환자군에서 낮은 지능을 보였으나, P300은 지능에 의해 영향을 받지 않았다. 환자군에서 Trail Making B 검사 수행시간이 오래걸렸으나 웩슬러 기억검사에서는 차이가 없었다. 뇌파분석 결과 두 군간의 차이는 없었다. 결론: 알코올의존 환자들은 신경생리학적인 측면에서 뇌기능의 저하를 보이고 있었고 이는 지능에 의해 영향을 받지 않았다. 신경인지기능검사는 이들이 측두엽보다는 전두엽의 기능이 더욱 더 저하하고 있다는 것을 시사하고 있다. 중심단어:알코올 의존·정량적 뇌파·사건관련전위 P300·인지기능. Objective: The purpose of this study is to determine whether patients with alcohol dependence do have brain dysfunction by auditory event related potential P300, EEG, and neuro-cognitive function test or not. Method: Subjects were composed of patients with alcohol dependence(N=33) and normal controls(N=67). P300 was determined by conventional method, Global Field Power method,and modified method. Also Korea Wechsler Intelligence Scale, Wechsler Memory Scale, and Trail Making B were tested. Spectral EEG was analyzed by the ranges of Hz, delta(δ,1-3.5Hz), theta (θ, 4-7.5Hz), alpha(α,8-13Hz), and beta(β,13.5-18Hz), and compared by relative power. Results: In patients with alcohol dependence, P300 was smaller and later, and there was no difference between the measurement methods of P300. Lower IQ score was shown in patients with alcohol dependence, but it did not affect the P300 results. It took more time to perform Trail Making B test in patients with alcohol dependence, but there was no difference between groups in Wechsler Memory Scale. Spectrum EEG was shown as similar patterns. Conclusion: It suggests that patients with alcohol dependence have brain dysfunction in so-me neurophysiological aspects, regrdless of intelligence. And frontal lobe dysfunction might be more severe than temporal one in patients with alcohol dependence. KEY WORDS:Alcohol dependence·EEG·P300·Neurocognitive function.

Mn-nodule의 선광에 관한 연구(제1보)

김익수,박동기,성일용,김승혁,엄제현 三陟大學校 2000 論文集 Vol.33 No.1

For the purpose of reserching the floatability of Managanese-nodule, the test was proformed by means of Zeta potential measuring and the flotation experiment for 10Å Manganite. The flotation condition in the flotation experiment were as follow. sample : Todorokite (0.3gr) sample size : 65 mesh ~ 200 mesh condition size : 10 min flotation time : 4 min air amount : 20 ㎖/min promoter : D.A.cl, S.D.S. PH regular : Hcl, CaO From the test the flotation result were summerized as follow. 1. The isoelectric point of 10Å Manganite in the Zeta potential measuring was pH 4.3. 2. The floatability of 10Å Manganite was 80% as a function of pH5 using 10mg/ℓ of D.A.cl. 3. The recovery of 10Å Manganite was best when the floatability of 10Å Manganite was 90% as using D.A.cl 80mg/ℓat PH 2.7.

거골의 박리성 골연골염

하권익,한성호,양보규,김치홍,김태성 대한스포츠의학회 1995 대한스포츠의학회지 Vol.13 No.1

거골의 박리성 골연골염은 연골과 연골하골이 균열되고 관절 면으로부터 부분적 혹은 전체적으로 분리되는 병변으로 흔치 않은 병변이다. 거골의 박리성 골연골염은 잘 알려져 있음에도 불구하고, 수술적 치료의 결과에 대한 지식은 적은 편이다. 저자들은 1998년 1월부터 1992년 12월까지 만 5년간 16명, 16례의 거골 박리성 골연 골염 환자를 평균 29개월 추시관찰 및 분석하여 다음과 같은 결과를 얻었다. 1) 연령 분포는 최소 15세에서 최장 58세 였으며 평균 30세 였다. 2) 16명의 환자중 남자가 14례 여자가 2례였고 우측 거골이 10례, 좌측 거골이 6례 였다. 3) 외상과 관계있는 환자는 16례중 15례였으며 거골의 내측에 병변이 있는 경우가 10례, 외측이 6례 였으며 양측인 경우는 없었다. 4) 증상 발현후 수술까지의 기간은 최단 3개월에서 최장 7년이 였으며 평균 25.9개월 이었다. 16명 전례에서 동통을 호소하였으며 6명에서 강직 및 불안정성을 각각 호소하였다. 5) Berndt와 Harty에 의한 병변 분류는 stage Ⅰ은 없었으며 stage Ⅱ는 4례, stage Ⅲ가 7례, stage Ⅳ는 5례로 stage Ⅲ이 가장 많았다. 6) 치료는 관절 개방술에 의한 절제술(1례), 절제술과 소파술 및 다발성 천공술(8례), 절제술 및 소파술 (3례), 소파술 및 bone peg(1례), 관절경적 소파술 및 다발성 천공술 (3례) 시행하였으며 치료결과는 O'Farrell 등이 사용한 평가 방법에 의하면 우수 13례 (81%), 양호 2례(12.5%), 불량 1례 (6.5%)였다. Osteochondritis dissecans of the talus is defined as a subchondral bony lesion of small fragment of bone, usually under two centimetres in diameter, with overlying intact articular cartilage. This fragment then becomes separated from its bed and undergoes necrosis. Although the lesion of osteochondritis dissecans of the talus is well known, there is little information in the literature concerning the results of surgical treatment. Sixteen cases of osteochondritis dissecans of the talus, operated on between January 1988 and December 1992, were studied. All were available for follow-up an average 29 months later and clinical analysis were as follows; 1. Age incidence was distributed from 15 years to 58 years (average 28) 2. 16 patients (14 male, 2 female) were examined and followed-up ; in ten the right ankle was involved and six the left ankle. 3. Of the 16 patients, 14 patients were associated with a history of trauma and 10 patients had medial lesions and 6 patients, lateral lesions. 4. The duration of symptom on these cases ranged from 3 months to 7 years, with an average of 25.9 months. All patients complain of pain when using the ankle and 6 patients complain of stiffness of the ankle and sensation of Berndt and Harty, four ankles had a stage Ⅱ lesion, nine had a stage Ⅲ lesion and five had a stage Ⅳ lesion. 6. The methods of treatment were excision (1 case), excision, curettage and drilling (8 cases), excision and curettage (3 cases), curettage with bone pegging (1 case) and arthroscopic curettage and drilling (3 cases). According to O'Farrell grading system which combined subjective with the objective assessment, 13 patients (81%) had good results, 2 patients (12.5%) had fair results, and 1 patient (6.5%) had a poor result.

운동선수의 성격유형에 관한 비교 연구

김성휘,김익겸,박영균 경희대학교 체육과학연구소 2001 體育學論文集 Vol.29 No.-

This study was designed to investigate the personality types of college student through examining their personality types by a psychological method called the MBTI test according to sex, universities, academic years, competitive item, and collective and individual athletes. The following conclusion is obtained through the MBTI test over 325 collegiate athletes. 1. The result of the MBTI test based on sex is that in the case of male athletes, ESTJ is much more prevalent than in the case of ordinary collegiate students, while in the case of female athletes, ISTP is much more prevalent than in the case of ordinary collegiate students. 2. The result of the MBTI test based on universities is that ISTJ is prevalent in D and K universities is that ISTJ is prevalent in KP university. 3. The result of the MBTI test based on the academic year is that ISTP is prevalent in freshmen and sophomores, while ESTP is (prevalent) in juniors and ESTJ is in seniors. 4. The result of MBTI test baser on competitive items is thst ESTJ is prevalent in Rugby, Taekwondo, volleyball ; ISTJ is in soccer, basketball, badminton and hockey ; ISTJ & ESTJ are in gymnastics ; ISFP is rowing ; ISTP is in wrestling ; INTP is in boxing. 5. The result of the MBTI test baser on collective and individual athletes is that ESTJ is prevalent in collective athletes, while ISTP is in individual athlete.

다양한 정신증상들이 수반되었던 갑상선 기능저하증 1례

한상익,최수호 大韓神經精神醫學會 1984 신경정신의학 Vol.23 No.2

It is well known that hypothyroidism usually presents with depressive symptomatology and thyroid function screening has been an established practice to rule out depression secondary to hypothyroidism. Authors presented a 32 year old hypothyroid woman who showed various mental symptoms and was given psychiatric diagnoses. She showed schizophrenic symptoms on the first attack, depressive symptoms on the second, organic brain syndrome mixed with schizophrenic symptoms on the third, and on the last one, depression and anxiety. Literature review revealed there wre few, if any, that a patient with hypothyroidism showed different kind of mental symptoms on each different attack. Recently there have been many researches to study the relation between thyroid dysfunction and affective disorders. However, further studies focusing on the relation between hypothyroidism and mental symptoms other than depression would be important for diagnostic and therapeutic implication.