경식도 심초음파도의 Direct Planimetry를 이용하여 측정한 대동맥판 면적의 심박출량 및 좌심실 구출율의 변화에 따른 정확도

진승원,김종진,김희열,박지원,전두수,윤호중,박준철,노태호,채장성,김재형,홍순조,최규보 대한순환기학회 2000 Korean Circulation Journal Vol.30 No.8

심실 조기 수축의 발생 부위 및 연결 간격의 차이에 따른 혈역학적 변화

진승원,김재형,노태호,조은주,김희열,이만영,김종진,박준철,채장성,홍순조,최규보 대한순환기학회 1999 Korean Circulation Journal Vol.29 No.7

T-scan을 이용한 교합분석에 관한 연구

진태호,한경수 圓光大學校 1993 論文集 Vol.27 No.2

Occlusion should be evaluated in view of the normal physiologic individual variations, and properly treated for good occlusal conditions that have harmonious that harmonious interrelation to masticatory functions. To do so, thorough knowledge and close examination on dental morphology, occlusal contacts during excursions, the mandibular movements, masticatory muscles and tempormandibular joint are essential to vevry clinician. Occlusal contacts during movements is as much important as other components or parameters above mentioned because it reflets not morphohologic status but functional dynamic demands and abilites of masticatory system. The objectives of this study was to investigate and analyze the effects of chewing side and lateral guidance pattern on the occlusal contacts. The author selected 65 students in Wonkwang University Dental College who had not any mandibu-lar dysfunction, and no extensive dental treatment history and also selected 60 patients visiting dentalinfirmary with temporomandibular disorder. They classified by chewing side preference and lateral guidance pattern into 4 groups. To record occlusal tooth contacts, T-Scan System (Tekscan Inc., U,S,A) was used on maximal clenching Record was done 3 times for accuracy, for every subject. The data was analyzed on 3 items which were number of tooth contact points, distribution of early contact points and average contact time intervals, and then, tested statistically. The obtained results were as follows: 1. The range of contact points on both sides in all groups were from 28 to 32. Bilateral canine guidance group had the most contact points, and unilateral non-canine guidance group had the least. Statistical difference between right and left side(or ipsilateral and contralateral side) were noted inallgroups. 2. In normal group, the degree of accordance of early contact points with preferred chewing side was higher in non-canine guidance groups, which was more prominent in case combined with uniateral chewing. And in patient group, result of canine guidance group was the same as normal group but that of the non-canine group was contrary to normal group. 3. Average contact time intervals in normal group were from 0.015 to 0.019sec, and showed no statistical difference among 4 groups. But, there was a tendency that the intervals were increased with canine guidance and/or unilateral chewing pattern. And average contact time intervals in patient group were higher than that of normal group as from 0.037 to 0.044sec, but there was no significance statistically.

약한 외부자장에 의한 유도결합형 플라즈마에서의 Helicon wave발생에 관한 연구

김상진,노태협,김곤호 한양대학교 이학기술연구소 2001 이학기술연구지 Vol.3 No.-

본 연구에서는 대면적 금속반응기에 I3.56MHz RF 전력을 인가하여 ICP(Inductively Coupled Plasma)를 발생하고, 외부에 약한 자기장(B<70G)을 인가하였을 때 플라즈마 내부에서 helicon wave의 전파현상을 관찰하였다. 기존의 ICP에 사용되는 안테나와 달리 직경이 서로 다른 두 개의 1turn 안테나를 직렬연결하여 안테나의 내부와 외부에 흐르는 전류의 방향을 반대가 되도록 하였다. 안테나에 의해 유도되는 자기장의 시간에 따른 변화량( ∂B/ ∂t)을 자기탐침을 이용하여 측정하였으며 유도되는 자기장의 θ방향성분을 측정하여 비대칭성을 갖는 m =1 mode임을 확인하였다. 발생된 플라즈마의 밀도는 Langmuir탐침을 이용하여 측정하였고, 측정된 밀도는 2.4 X 10^(10)cm^(-3) ~ 2.25 X 10^(11)cm^(-3) 이었다. 측정한 밀도와 외부에 주어진 자기장을 dispersion relation에 대입하여 계산된 wave number와 자기탐침을 이용하여 측정한 wave number를 비교하여 전파된 wave가 helicon wave 와 일치함을 확인하였다. This study was on the helicon wave propagation in an ICP(Inductively Coupled Plasma), which was generated by I3.56MHz RF power in a large area metal chamber with low external B-field(B<70G). Unlike a usual antenna for ICP, two different diameter I-turn antenna was connected in serial to opposing a current flowing the inner and the outer antenna. Time dependent B-Field( ∂B/ ∂t ), induced by the antenna was measured by a magnetic probe. It was confirmed m=I mode wave propagation by measuring θ component of the induced B-field. Plasma density was measured by Langmuir probe. It was 2.4 X 10^(10)cm^(-3) ~ 2.25 X 10^(11)cm^(-3)? By comparing a wavenumber which is calculated from the measured density and external B-field to a wavenumber measured by the magnetic probe, the helicon wave propagation has been confirmed.

여기신호 생성 알고리즘의 VHDL 구현

김진호,차형태 崇實大學校 1999 論文集 Vol.29 No.1

In this paper, we have designed the excitation signal generation algorithm of MPEG-4 audio CELP(Code Excitation Linear Prediction) using VHDL(Very High Integrated Circuit Hardware Description Language). It is consist of a add and multiplication such as general DSP(Discrete Signal Processor). We have optimized to reduce required computation cost. Especially, we have used characterization of information which has redundancy to minimize memory size and access time. In addition, we have designed to minimize error using dynamic precision operation for part of distortion with fixed point bit operation, when the dynamic range is over in result. It is a basic studying for MPEG-4 audio CELP decoder, and will be using ASIC design of the MPEG-4 Audio CELP decoder. We have compared VM(Verification Model) source based on a real speech signal consist of the C language with the VHDL code to confirm accuracy of the VHDL code. In result, we have found that both of them are almost similar.

말초혈액 내 백혈구수와 대사증후군과의 연관성

황상태,김범수,황상준,서정열,김병진,이원영,성기철,강진호,김선우,이만호,박정로 대한순환기학회 2004 Korean Circulation Journal Vol.34 No.3

중심위에서의 하악과두위치와 과두운동간의 관계에 관한 연구

한경수,진태호 圓光大學校 1988 論文集 Vol.22 No.2

측두하악관절은 악구강계의 일부로서 교합과도 밀접한 관계를 가지고 있으며 그 운동양상이 다양하고 복잡하여 많은 학자들의 연구대상이 되어지고 있다. 그러나 이러한 악관절에 대한 연구는 주위 근육, 신경등 신체의 여러 요소들이 상호작용하기 때문에 매우 어려운 것으로 알려져 있다. 이에 저자는 환자와 정상인을 대상으로 관절와내에서의 과두의 위치와 과두의 운동 상호간의 관계를 연구하고자 Pantronic (Dear Corp., U.S.A)와 transcranial radiography를 이용하여 연구한 결과 다음과 같은 결과를 얻었다. ;관절강폭은 이환측의 경우 비이환측에 비해 다소 감소된 경향을 나타냈으나 통계학적인 유의성은 없었으며, 이환측에서 ISS (Immediate Side Shift)와 상방 및 후방 관절강폭간에는 역상관관계를 나타냈으나, 비이환측에서는 과두운동과 과두의 위치간에는 상관관계가 없는 것으로 나타났다. The purpose of this study was to investigate the relationship between the condylar movement and condylar position in centric relation in the temporomandibular joint. 23 out patients in Wonkwang University Dental hospital and 10 Dental students were participated in this study. For the measure of condylar movement, the Pantronic (Denar Corp., U.S.A.) was used, and for evaluation of the condylar position, transcranial radiography was used. The results were as follows ; The joint space of affected group was some narrower than that of unaffected group, but there was no statistical significance, and in the affected group, there was a negative correlationship between Immediate side shift and upper or posterior joint space. In the unaffected group, there was no correlationship between condylar movement and condylar position in centric relation.

반복 사용된 IPS Empress 2의 표면경도와 pressing accuracy에 관한 연구

손의수,진태호 원광대학교 치의학연구소 2003 圓光齒醫學 Vol.12 No.1

The purpose of this study was to investigate the possibility on recycling of IPS Empress 2 ceramic for wide application of IPS Empress 2 ceramic in prosthodontic treatment. 1st, 2nd and 3rd pressed disc-shaped(10X1.5mm) IPS Empress 2 specimens were made with IPS Empress ingot(200, Ivoclar, Liechtenstein, Germany ) and pressing furnace(IPS Empress EP 500, Ivoclar, Liechtenstein, Germany). Vicker's surface hardness and fracture toughness, acid resistance, and pressing accuracy of IPS Empress 2 ceramic were measured and analyzed. Surface hardness was measured by microhardness tester(MTX 70, Matsuzawa, Japan). before and after surface treatment with 0.5% hydrofluoric acid and carbonic acid(Coca cola) for evaluation of acid resistance. The obtained results from this study were as follows: 1. The surface hardness of 1st pressed specimen was the higher(5.11 GPa) than those of 2nd pressed( 4.89 GPa) and 3rd pressed specimen(4.86 GPa). 2. The fracture toughness of 1st pressed (1.58 MPam^1/2)and 2nd pressed specimen(1.51 MPam^1/2) were higher than that of 3rd pressed specimen(1.39 MPam^1/2). 3. The changes of surface hardness of 1st, 2nd, and 3rd pressed specimens after treatment with fluoric acid were 0.17, 0.06, 0.05GPa respectively, and those of 1st, 2nd, and 3rd pressed specimens after treatment with carbonic acid were 0.07, 0.00, 0.05MPa respectively. 4. The pressing accuracy of 1st, 2nd and 3rd specimen were 77.22%, 85.681%, and 75.05%. The pressing accuracy of 2nd pressed specimen was higher than that of the 3rd specimen. The changes of physical properties according to recycling of IPS Empress 2 from this study were insignificant. Therefore the possibility of recycling of IPS Empress 2 can be suggested from the results.

상아질 결합제의 생체적합성에 관한 연구

김성훈,진태호 원광대학교 치의학연구소 2003 圓光齒醫學 Vol.12 No.3

This study was investigated to evaluate the biocompatibility of dentin bonding agents. The 4th generation dentin bonding agents such as Scothbond Multi-Purpose(3M, USA), Clearfil Liner Bond 2(Kuraray, Japan), All Bond 2(Bisco, USA), and 5th generation dentin bonding agents such as Single bond(3M, USA) Prime & Bond NT(Dentsply, Germany), and One Step(Bisco, USA) were used in this study. The viability of normal human pulp cell, gingival fibroblast, immortalized gingival fibroblast and HaCaT cell was measured in vim for evaluation of cytotoxicity on dentin bonding agents, and the response of pulp tissue(organotypic tooth slice culture) was analyzed and evaluated with light microscope after application of dentin bonding agents at cutting incisor edge of rats. The results obtained from this study were as follows : I. The gingival fibroblast was the most sensitive to toxicity of dentin bonding and HaCaT cell was the least. 2. The cytotoxicity of One step was low and that of ScotchbondScotchbond Multi-purpose was high in pulp cell and immortalizedginggival fibroblast. 3. The cytotoxicity of the 5th generation dentin bonding agent was lower than that of 4th generation dentin bonding agent in gingival fibroblast 4. Scotchbond Multi-Purpose showed the highest cytotoxicity comparativelyn most cells including HaCaT cell. 5. At 2 days after cultivation of tooth slice organ, them was no significant change in alveolar bone and periodontal ligament according to dentin boading apts. Odntoblasts and pulp cell population was excellent in the 5th generation dentin bonding agents after 2 days cultivation, and the similar response of odntoblasts and pulp cell was revealedafter 10 days cultivation. Collectively, in vim, cell viability and tooth slice organ culture test revealed similar results. From this study, we find out the some tendency that Scotbond Milti-Purpose is relatively more cytotoxic and One-Step is less

전부도재관용 레진시멘트의 생체적합성에 관한 연구 : Ceramic Crown

김광준,진태호 원광대학교 치의학연구소 2003 圓光齒醫學 Vol.12 No.1

This study was investigated to evaluate the biocompatibility of resin cements for all- ceramic crowns. The resin cements used in this study were Panavia F (Kuraray Co., Ltd. Japan), Variolink Ⅱ(Vivadent Ets., Schann / Liechtenstein), and Bistite Ⅱ(Bistite dual cure resin cement-clear, Tokuyama Soda Co., Japan). The viability of normal human oral keratocytes, gingival fibroblast, and gingival fibroblast immortalized by Human Papilloma virus 16 was measured in vitro for evaluation of cytotoxicity on resin cements, and the response of pulp tissue was analyzed and evaluated with light microscope after application of cements at cutting edge of incisors. The followings were drawn from this study : 1. The normal human oral keratocytes was the most sensitive to toxicity of resin cement, and toxicity of cements was higher in Bistite Ⅱ than in Variolink Ⅱ. 2. The cell viability of immortalized gingival fibroblast did not affected by type of cement and cultivation period, but there was a tendency that cytotoxicity in Bistite Ⅱ was higher than in Variolink Ⅱ. 3. The cell viability of gingival fibroblast was similar to that of immortalized gingival fibroblast regardless of cement type, but Bistite Ⅱ showed more toxic than others after 5 days cultivation 4. The responses of pulp tissue according to cement type were similar after 2 days cultivation, but revealed high toxicity in Bistite Ⅱ after 10 days cultivation.