유역인자 분석에서 DTED의 효용성 분석

천기선,양인태,박재훈 江原大學校 産業技術硏究所 1998 産業技術硏究 Vol.18 No.-

A watershed terrain factor is known to the very important in studies of a stream and a watershed. We have obtained the terrain factor in map directly or we have generated it in a digitalized map. In this study, DTED (Digital Terrian Elevation Data) offering in DMA(Defense Mapping Agency) was used to create a stream and a watershed and to extract the terrain factor. As comparison of the factors gererated in digitalized map the terrain factors extracted in DTED, DTED could be used to extract a terrain factor for a watershed management.

L1₂ 기 Al-Ti-Cr 합금의 상안정성에 미치는 Zr 첨가효과

천동현,이재경,오명훈,위당문 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.1

Interest in the L1₂ phase in the Al-Ti-Cr system has increased with respect to the demand for light weight materials at elevated temperature because of its enhanced mechanical properties that arise through the substitution of Cr for Al in Al₃Ti intermetallic compounds. Additionally, recent work has indicated that the application of L1₂- based alloys was extended to oxidation resistance coating materials for γ-based TiAl alloy because the L12 phase could form a protective Al₂O₃ scale under oxidizing environments. However, L1₂ phase decomposes partially or completely to a more brittle phase when exposed to temperatures in the range of 800~1000℃, resulting a serious degradation of the cracking resistance in L1₂-based alloys. In this study, Zr was substituted for Ti in Al-21Ti-23Cr alloys to improve the phase stability around 800℃. As a result of Zr addition in L12-based Al-Ti-Cr alloys, the fraction of L12 phase decomposition at 800℃ was decreased. Furthermore, temperature range, in which L1₂ phase was decomposed to other brittle phase, was shrunken when Zr was added in the Al-Ti-Cr alloys. These phenomena resulted from the fact that the L1₂ phase field was less shifted in the direction of the Al-rich corner at 800oC in the Al-Ti-Cr system and that atomic diffusion for the L1₂ phase decomposition was reduced. Therefore, the addition of Zr is required to increase the possibility for potential usage of L1₂-based Al-Ti-Cr alloys at elevated temperatures around 800℃ because of the improvement of phase stability.

규칙 기반 시스템에 기초한 지식탐사에 관한 연구

류명춘,이훈재,서동주 경운대학교 산업기술연구소 1998 産業技術硏究論文誌 Vol.1 No.1(A)

The number of databases maintained in the world is increasing rapidly. Many of these databases are huge and are therefore very difficult to manually analyze. To make it feasible to analyze databases, researchers have been developing tools for knowledge discovery in databases. This paper proposed the knowledge discovery system based on rule-based system to efficiently discover knowledge in databases.

사과나무 腐爛病 防除에 關한 硏究 : 腐爛病源菌의 生育抑制에 미치는 化學藥劑, 抗生劑 및 生藥抽出物의 效果 The Effects of Chemical Compounds, Antibiotics and Extracts of Herbal Plants on the Growth Inhibition of Valsa ceratosperma Strains

정재훈,양덕춘 경희대학교 유전공학연구소 1990 遺傳工學論文集 Vol.2 No.-

These studies were conducted to control of apple cankers caused by Valsa ceratosperma strains by treatment of chemical compounds, antibiotics, extracts of herbal plants and compounds produced from mutant of Streptomyces melanosporofaciens. Effects of chemical control for apple canker were evaluated by growth inhibition of Valsa ceratosperma on the PDA media and the most effective chemical was found to be berberine followed by neoasogin, branchi Q, in general. Inhibitory concentration of Valsa ceratosperma was 500㎎/ℓ in berberine, and 10,000㎎/ℓin neoasogin. The antifungal antibiotic, cycloheximide, was effective for growth inhibition of Valsa ceratosperma; all strains were inhibited on the media with 100㎍/㎖ of cycloheximide and M26 strain was inhibited by lower concentration of 10㎍/㎖. Effects of extract of herbal plants for growth inhibition of Valsa ceratosperma were excellent with Phellodendron amurense and Coptis japonica, and especially in Coptisjaponica, low concentration of 1,000㎎/ℓ was effective Compounds produced from mutant of S melanosporofaciens for growth inhibition of Valsa ceratosperma were more effective than other compounds, i.e., chemical compounds, antibiotics and extracts of herbal plants. Minimum inhibitory concentration of compound C-1 for IF03025 and M1099 was 3125㎍/㎖.

T1급 고속 암호 시스템에 관한 연구

이훈재,류명춘,오주환 경운대학교 산업기술연구소 1998 産業技術硏究論文誌 Vol.1 No.1(A)

In this paper we propose a secure T1-rate digital image conference system which consists a stream cipher of 7-bit real adder with 2 bit carrys and a fast and stable 2-step full-duplex synchronization. And we analyze the cipher algorithm and the synchronization performance of the system.

사과나무 腐爛病 防除에 關한 硏究 : 腐爛病源菌의 生育抑制에 미치는 化學藥劑, 抗生劑 및 生藥抽出物의 效果 The effects of Chemical Compounds, Antibiotics and Extracts of Herbal Plants on the Growth Inhibition of Valsa ceratosperma Strains

정재훈,양덕춘 경희대학교 부설 식량자원개발연구소 1990 硏究論文集 Vol.11 No.-

These studies were conducted to control of apple cankers caused by Valsa ceratosperma strains by treatment of chemical compounds, antibiotics, extracts of herbal plants and compounds produced from mutant of Streptomyces melanosporofaciens. Effects of chemical control for apple canker were evaluated by grwoth inhibition of Valsa ceratosperma on the PDA media and the most effective chemical was found to be berberine followed by neoasogin, branchi Q, in general. Inhibitory concentration of Valsa ceratosperma was 500mg/ℓ in berberine, and l0,000mg/ℓ in neoasogin. The antifungal antibiotic, cycloheximide, was effective for growth inhibition of Valsa ceratosperma; all strains were inhibited on the media with l00㎍/㎖ of cycloheximide and M26 strain was inhibited by lower concentration of 10㎍/㎖. Effects of extract of herbal plants for growth inhibition of Valsa ceratosperma were excellent with Phellodendron amurense and Coptis japonica, and especially in Coptis japonica, low concentration of l,000mg/ℓ was effective. Compounds produced from mutant of S. melanosporofaciens for growth inhibition of Valsa ceratosperma were more effective than other compounds, i.e., chemical compounds, antibiotics and extracts of herbal plants. Minimum inhibitory concentration of compound C-1 for IF03025 and M1099 was 31.25㎍/㎖.

상악전치부 심미에 대한 인식도 평가

정재훈,오상천 원광대학교 치의학연구소 2003 圓光齒醫學 Vol.12 No.2

This study was undertaken to determine the Korean perception of the altered anterior dental esthetics including the lack of symmetry, the midline deviation, the gingival exposure, the inclination of incisal plane, the type of incisal plane, and the type of gingival line. 670 subjects were participated in this survey. A questionnaire accompanied by 12 sets of computer-manipulated images using 3D MAX 4.2 software was used to record the ranking of the geometric preference related to the anterior esthetic discrepancies in three or four degrees of alteration. The statistical significance of the differences between the groups was determined by a one-way ANOVA and a t-test. The results obtained were as follows: 1. The Korean perception of the anterior dental esthetics according to the subjects' occupation, sex, and age was most affected by occupation. 2. The masked image emphasizing the dentition and lips appeared stranger than the non-masked image at the same alteration. 3. The lack of symmetry, which was expressed as a unilateral discoloration of the tooth, showed incongruity in any teeth of the anterior dentition. The incongruity was more severe as the degree occurred closer to the midline, 4. The deviation of midline was showed more severe strangeness as the degree of deviation increased. However, more than half of the subjects did not perceive a deviation of 5mm. 5. During smiling, the exposure of the upper gingiva showed more severe incongruity as the degree of gingival exposure increased. 77% of the subjects perceived strangeness at the gingival exposure of 4.5mm. 6. The inclination of the incisal plane appeared stranger as the degree of inclination increased. 62% of subjects perceived strangeness at the 7.5˚ inclination of the incisal plane. 7. The type of incisal plane showed increasing strangeness in the order of convex/downward, straight/horizontal, and concave/upward. 80% of subjects perceied strangeness at concave/upward. 8. The type of gingival line was showed increasing incongruity in the order of the same, a little above, and a little under the zenith of the lateral incisor to the line joining the zenith of the central incisor and the canine. However, less than half the subjects did not perceive strangeness at any alteration of the gingival line.

서울의 Penicillinase Producing Neisseria Gonorrhoeae 발생빈도(1996)

김재홍,황동규,전재홍,김윤석,김중환,김용준,이창균,임동진,김현수,조창근,김경문,박상훈,전우형,김희성,이호정,차명수,김갑형,김형석,김석우,황지환,박병순,권오상,이민수,송기훈,성소영,이인섭,부태성 대한화학요법학회 1999 대한화학요법학회지 Vol.17 No.2

Background : In recent years, gonorrhea has been panedemic and remains one of the most commom STDs in the world, especially in developing countries. Objective & Methods: For the detection of a more effective therapeutic regimen and assessing the prevalence of PPNG, we have been trying to study the patients who have visited the VD Clinic of Choong-Ku Public Health Center in Seoul since 1980 by means of the chromogenic cephalosporin method. Results: In 1996, 139 strains of N. gonorrhoeae were isolated, among which 53(39.0%) were PPNG. Conclusion: Our results suggests that after a peak of 74.3% in 1993, the prevalence of PPNG in Seoul is gradually declining.

LILI-128 암호의 고속화 방안 및 FPGA 구현에 관한 연구

이훈재,박영민,류명춘 경운대학교 산업기술연구소 2001 産業技術硏究論文誌 Vol.3 No.2(A)

Because LILI-128 cipher is a clock-controlled keystream generator, it makes the keystream data degrade in a speed for clock-synchronized hardware logic design: The clock-controlled LFSR_d in LILI-128 cipher requires 1∼4 times higher system clock, that is the reason why the system throughput in data rate is lower if the same clock were selected and that is the structural problem in principle. In this paper, we propose the solution to 4-bit parallel LFSR_d that each register bit has four variable data routines to feedback or shift in LFSR_d. Finally, we simulates the timing of the design on Max+plus Ⅱ of ALTERA Co., implements the logic circuit to the FPGA device (EPF10K20RC240-3), and analyses the stability on throughput to 50 Mbps rate (we choose a higher speed than T3 rate, 45 Mbps and the maximum delay routine in our design is below 20ns) under the 50㎒ system clock. For example, Lucent technologies ASIC can achieve the throughput about 500 Mbps if the maximum delay routine were 1.8㎱ at a 0.13 ㎛ semiconductor.

기관지석으로 발현한 기관지성 방선균증 1예

정숙인,천정학,홍종락,고영민,정만표,권오정,이종헌,백경란,송재훈 대한화학요법학회 1999 대한화학요법학회지 Vol.17 No.2

기관지성 방선균증은 매우 예외적이고 드물며 임상양상이 다양하여 폐암과의 감별이 어렵기도 하지만 기관지내시경 검사를 통해 진단할 수 있고 항생제 투여로 완치될 수 있는 질환이다. 저자들은 기관지석과 함께 발현한 기관지성 방선균증을 장기간의 경구 항생제 요법으로 완치한 1례를 경험하였기에 보고하는 바이다. Endobronchial actmomycosis is considered as an exceptional event. We report a case of a 49-year-old woman who presented with cough and exertional dyspnea for 20 months. Her chest X-ray showed calcified lymph nodes in the right lower paratracheal and subcarinal area and consolidation in the right middle lobe. Bronchoscopic examination demonstrated whitish broncholithiasis with mucosal nodularity in the bronchus intermedius obstructing the lumen near-completely. The biopsy specimen revealed sulfur granules and calcified material which were consistent with actmomycosis. Prolonged oral antibiotic treatment resulted in complete recovery, without need for surgical resection.