차량용 교류발전기의 소음 특성에 관한 연구

송찬일,송상기,송각기 조선대학교 에너지.자원신기술연구소 2000 에너지·자원신기술연구소 논문지 Vol.22 No.2

Automobile alternator noises are composed of mechanical noise, ventilation noise and magnetic noise. The design of magnetic parts, fans, bearing, and the rotor has an effect on these noises. In running automobile alternator, these elements can generate noises and vibrations. To know the noise sources of the various alternator, the characteristics of noises are analyzed as rotating speed is increased. Also, this study analyze the harmonics of the noise for the various alternators. The results of this study can lead the instruction to the noise reduction on the automobile alternator.

한국 젊은이의 顔面美 選好傾向에 관한 연구 : 얼굴의 側貌評價를 중심으로

宋世津,崔益燦 대한치과교정학회 1992 대한치과교정학회지 Vol.22 No.4

This study was designed to assess profile preferences among Korean youths in the year 1992. Facial esthetics was evaluated by means of silhouette profiles, eliminating the influence of a number of aspects that may affect judgment when normal lateral photographs are used. The main points of preference to be clarified here are as follows: First, on facial convexity, Second, on nasion depth, Third, on mentolabial sulcus depth. Fourth, on the position of upper and lower lips, Fifth, on facial type according to Angle's classification of malocclusion, Sixty, on Song's tangents. The 54 subjects printed in questionnaire as black and white silhouettes were selected from 300 tracings from cephalometric radiographs of people whose age ranging from 11 to 20 years. Photographs of six female subjects were retouched by computer graphic software and printed in color and black/white photographs which were used for adaptation of eyes of participants in selecting profiles in silhouette. They constitute 2 questions. The 54 subjects were grouped as 22 questions, each of them composed of 6 subjects, according to the aspects to be clarified. Twenty four questions in total were asked to assess profile preferences. For the assessment, the profile line, the facial esthetic triangle, Song's tangents, and Angle's classification of malocclusion were introduced. The profile line is composed of 11 component points which are Trichion, Glabella, Nasion, Pronasale, Subnasale, Labrale superius, Stomion, Labrale inferius, Supramentale, Pogonion, and Gnathion. The facial esthetic triangle is composed of 3 tangents: A-tangent which is the tangent of dorsum of nose, B-tangent which is the line passing through Sn and Ls, and C-tangent which is drawn on the turning point of the curve which lies between mentolabial sulcus (Sm) and pogonion(Pg). Angle's classification has 3 types of malocclusion which are Class Ⅰ, Class Ⅱ, and Class Ⅲ. Class Ⅱ malocclusion is subdivided into Division 1 and Division 2. The participants of the survey were composed of 861 college students (448 male students, 413 female students) whose majors grouped as Fine Arts Liberal Arts, and Natural Sciences, and whose mean age 21.8 years. The statistics program SPSS/PC + of SPSS Inc. was used to analyze answers of participants. Crosstabulation, Chi-square test, and Kendall test were done. The conclusions are as follows: First, Korean youths have a tendency to prefer the slightly convex face to the flat or concave face. Second, they prefer a moderately deep nasion. Third, they prefer a moderately deep mentolabial sulcus. Fourth, they prefer the position of lips which are near to Ricketts' E-line. The position of the upper lip which is slightly posterior to E-line is preferred. The upper lip which lies too far anterior or posterior to the lower lip is not perferred. Fifth, they prefer most, according to Angle's Classification of Malocclusion, Class I facial profile which has a slight inclination to Class Ⅱ division2. The order of preference is Class Ⅰ, Class Ⅱ division 2, Class Ⅲ, and Class Ⅱ division 1. Sixth, they prefer the type 2 and 3 of Song's tangents. The facial profile within which A-and B-tangent meet is preferred. The facial profile which has C-tangent that meets with A-tangent slightly posterior to the crossing point of A-and B-tangent or that parallels with B-tangent is preferred.

차량용 교류발전기의 소음 특성에 관한 연구

송찬일,송상기,송각기 조선대학교 에너지.자원신기술연구소 2002 에너지·자원신기술연구소 논문지 Vol.24 No.2

Automobile alternator noises are composed of mechanical noise, ventilation noise and magnetic noise. The design of magnetic parts, fans, bearing, and the rotor has an effect on these noises. In running automobile alternator, these elements can generate noises and vibrations. To know the noise sources of the various alternator, the characteristics of noises are analyzed as rotating speed is increased. Also, this study analyze the harmonics of the noise for the various alternators. The results of this study can lead the instruction t o the noise reduction on the automobile alternator.

치아재식술 시 근관충전재로 사용된 수산화칼슘 제재의 치근단 조직 반응 및 치근 흡수의 평가

송상채,이승종,정일영,이찬영,금기연 대한치과교정학회 2001 Restorative Dentistry & Endodontics Vol.26 No.2

Calcium hydroxide pastes is widely used in conventional endodontics. Along with the expanded clinical use of calcium hydroxide, literatures suggest mixing calcium hydroxide with other substance. Among added substances the vehicle plays the most importance role in the overall process because it is directly related with the velocity of ionic dissociation Of Ca^(2+) and OH^- ion. In this study, we evalutated and compared periapical tissue response and root resorption after canal was filled with mixture of saline and calcium hydroxide(Junsei Chemical Co., Japan) as a aqueous vehicle, Metapaste(Meta Co., Korea) as a viscous vehicle paste, Vitapex(Neo Dental, Japan) as a oily vehicle paste and IRM(Caulk Dentsply, USA) in replantation of rat molar. A total of 31 maxillary first molars of Sprague-Dawley female rats, 30 days old were used. The upper 1st molar was extracted and the mesiobuccal canal was filled with mixture of saline and calcium hydroxide, Metapaste, Vitapex, IRM and then replanted. Rats were sacrificed 3 weeks after replantation, the maxillae were removed, section of 4 micron were cut and stained with hematoxylin-eosin. Apical tissue response were observed under light microscope. The results were as follows : 1.Saline mixing group and Metapaste group were significant different in fibrous capsule width compared to Vitapex group and IRM group(P$lt;0.05). 2.Saline mixing group, Metapaste group, Vitapex group and IRM group did not prevent root resorption and there were no statistical difference. 3.In saline mixing group and Metapaste group, loss of pastes were observed in all samples. From the results of our study, we observed loss of pastes in saline mixing group and Metapaste group because of water soluble property and assumed it was related to inflammation in apical area and sealing ability of material. So, we should study and develop calcium hydroxide vehicle which is easily removed and more stable and because of only 3 weeks observation we need more evaluation in long period.

Ga_(0.6)Sb_(1.4)Se₃單結晶의 光傳導度 特性

宋燦日,劉炳守,李愚宣,金南伍,金亨坤 조선대학교 에너지.자원신기술연구소 2002 에너지·자원신기술연구소 논문지 Vol.24 No.2

Ga_(0.6)Sb_(l.4)Se₃single crystals were grown by the Bridgman technique method, These single crystals had orthorhombic structure, and lattice constant and electric conduction type of Ga_(0.6)Sb_(l.4)Se₃single crystals was a = 11.860Å , b = 12.057Å, c = 4.103Å and p-type, respectively. Direct band gap of Ga_(0.6)Sb_(l.4)Se₃single crystals obtained from optical absorption spectrum were 1.17 eV. Photoconductivity spectrum measured at 10K showed that the photoconductivity peak in Ga_(0.6)Sb_(l.4)Se₃single crystals was located in 960 nm.

한국 및 러시아 한국계 청소년 우울증의 사회심리적 위험요인에 대한 횡문화 비교 연구

송동호,민성기,김지웅,김찬형,이홍식,Kim, Larissa 大韓神經精神醫學會 1999 신경정신의학 Vol.38 No.5

연구목적 : 본 연구는 사회문화적 배경이 다른 한국과 러시아, 두 나라의 한국인 청소년을 대상으로 우울증의 유병율을 비교 조사하고, 우울증과 관련된 사회심리적 위험요인들을 알아보고자 하였다. 방 법 : 연구도구의 한국어판을 제작하고 두 나라의 청소년 우울증 환자 40명씩을 대상으로 우울척도의 cut-off 점수를 산정하기 위한 예비연구를 본 연구에 앞서 시행하였다. 한국의 청소년 대상은 서울 소재의 중고등학생 838명이었고, 러시아의 청소년은 우즈베키스탄 공화국의 중고등학생 중 양부모가 모두 한국인인 652명이었다. 연구도구로는 우울증의 사회심리적 요인들과 횡문화적 요인들을 조사하기 위하여 기초자료 설문지 및 Beck 우울척도를 적용하였다. 결 과 : 우울증 환자를 대상으로 시행한 예비연구에서 얻은 Beck 우울척도의 cut-off 점수 19점 이상을 기준으로 하였을 때, 한국 청소년 집단에서 우울증의 유병률은 26.5%인데 반하여 러시아 청소년에서는 7.4%의 유병률을 보였다. 한국인 청소년들은 한국인-러시아 청소년에 비하여 염세주의(pessimism), 실패감(failure), 자살사고, 죄책감 등, 절망감(helplessness)과 관련된 증상들이 유의하게 많이 나타났다. 한국인 청소년과 한국인-러시아 청소년 간에 우울증의 유의한 사회심리적 위험요인들로서 여성, 낮은 학업성적, 부모와의 갈등이 공통적으로 나타났으며, 그외에 친구교제 요인, 만성 신체질환, 형제간이나 친구들과의 갈등이 한국인 청소년에서는 또 다른 위험요인으로 존재하였다. 결 론 : 본 연구를 통하여 한국인 청소년의 우울증 유병율이 한국인-러시아 청소년의 유병률에 비하여 유의하게 높았으며, 한국과 러시아의 한국인 청소년들 간에 우울증의 유의한 사회심리적 위험요인들이 차이가 있음을 시사한다. Objectives : In order to study a cross-cultural epidemiology of the adolescent depressives with Korean ethnicity in Korea and Russia, we compared psychosocial characteristics and risk factors of depressive disorder between two school-based populations in different sociocultural environments. Methods : We measured psychosocial variables of 838 subjects in Korea, and 652 in Russia(Uzbekitan) using Basic Questionnaires and Beck Depression Inventory(BDI). Results : The cut-off point of BDI for adolescent depression in Koreans was 19 points. Higher prevalence of depression was noted in Korean adolescents(26.5%) compared to Korean-Russian adolescents(7.4%). We found signicant risk factors of adolescent depression in two study samples : female, academic failure, meeting friends less frequently, presence of chronic physical illness, interpersonal problems with parents, and same-sex and opposite-sex friends. Conclusions : Our data will provide information on cross-cultural understanding of psychosocial characteristics and risk factors in adolescent depression compared between Koreans and Korean-Russians.

레일리 페이딩 채널에서 길쌈부호를 채용한 16QAM/OFDM 시스템 성능에 관한 연구

송찬호,이용일,김언곤,강영흥 大田産業大學校 1999 한밭대학교 논문집 Vol.16 No.1

In this paper, we simulated the performance of 16QAM/OFDM system with 1/2 convolutional coding technique in Rayleigh fading channel with COST-207 delay model. This system includes the Time/Frequency Interleaver, which is adapted EUREKA-147, and the 2-dimentional Pilot Symbol Assited Modulation(PSAM) method with or without low pass filter(LPF). In the simulation, we consider the coding effect according to channel decoding method and the performance of channel estimation with or without LPF. As a result of simulation, We obtained the result that the system using 4bit soft decision Viterbi decoding is required about 11dB -- 14.5dB to satify the BER 10^-3 in Rayleigh fading channel according to channel condition. And also the system performance of PSAM with LPF has thc better peformance of about 2dB than that of system without LPF. And the coding effect of this system is about 2 - 6dB according to channel decoding method.

임베디드 시스템에서 Mobile IP 프로토콜 구현

宋東勳,裵振勝,鄭燦赫,吳世德,李基源,劉忠烈,河載承,李光培,金玄郁 명지대학교 산업기술연구소 2005 産業技術硏究所論文集 Vol.24 No.-

With rapid growth of the internet, need for the mobile communication networks is increasing. In this paper, we implement and test Mobile IP Protocol in Embedded System. Our Mobile IP-based testbed consisted of two sub-networks and each sub-network was configured to operate independently through use of router. To satisfy integrated wired/wireless network model established on the testbed design and show generality of the testbed, we implemented mobile nodes, home agent, foreign agent and router on the basis of Linux operating system. As the results of the evaluation, we confirmed that mobile nodes operated properly according to Mobile IP Protocol.

TiN이 증착된 SiO/TiN 박막의 전압-전류 특성

송찬일,김창석,정천옥,김병인 조선대학교 에너지.자원신기술연구소 2001 에너지·자원신기술연구소 논문지 Vol.23 No.2

In this study, the evaporation of SiO layers with different thickness on Si wafer(n-100) is conducted by using the RF sputtering method. Thin films are made with the structure of Si/SiO and Si/SiO/TiN by evaporating TIN which is used as a diffusion barrier of non-resistant superintegrated semiconductor circuit. The research is performed to increase the I-V characteristics depending upon the SiO thickness and the reliability and reproducibility of the TiN thin film. It is shown that, since the TiN is diffused into SiO surface and fosters the potential barrier highly in the SiO/TiN thin film, the saturation voltage appears after the SiO thin film does. The thicker the SiO film becomes, the weaker the current variation does and the less leakage current the TIN deposited thin film has. The leakage current variation with a little slope is found in the negative voltage zone due to the effect of the trap state density near the electrode. The spiking which occurs when the film is too very thin can be reduced by adding TIN. The stability can be obtained due to no pervasion of A1 into SiO. The experimental result matches the Ohm's law and satisfies the equation of current.

도움닫기 거리가 멀리뛰기 기록에 미치는 영향 : 중학교 1학년 여학생을 중심으로 about the first-grade middle schoolgirls

宋順德,朴贊弘 公州大學校스포츠科學硏究所 1995 스포츠科學硏究所論文集 Vol.- No.9

To know the record affected by Approach-distance, 135 first-grade Schoolgirls of Y-middle school were sampled at random, and divided into three groups of Approach-distance 10m, 15m, and 20m. And then the experiment through the lesson for eight weeks was done and the effect was this : 1. In the first-grade middle schoolgirls case, the record of Long-jump was seldom affected by Approach-distance 10m. 2. But Approach-distance 15m and 20m were effective and, the most suitable approach-distance was 15m.