컴퓨터 그래픽에서의 효율적인 2차원 직선클리핑 알고리즘

禹相旭,趙源敬 慶熙大學校 1990 論文集 Vol.19 No.-

This paper proposes a development algorithm for clipping a line in two dimensions against a rectangular window. This algorithm avoids computation of intersection points which are not end point of the output line segment. In order to compare performance with previous algorithm, this paper is compared with number of arithmetic operations needed for clipping in all conditions which can be occurred. As a result of comparing it was proved that proposed algorithm is more efficient than CS and TR chipping algorithm in same conditions.

NiTi-형상기억합금 차동식 액츄에이터의 동특성연구

정상화,김현욱,장우양,김경석,차경래,나윤철 朝鮮大學校 機械技術硏究所 2001 機械技術硏究 Vol.4 No.2

최근 전 세계적으로 초소형 정밀 기계 기술에 관한 연구 및 개발이 활발하게 이루어지면서 형상기억합금(Shape Memory Alloy : SMA)을 이용한 초소형 액츄에이터(Micro Actuator)에 관한 관심이 증대되고 있다. 형상기억합금을 액츄에이터에 응용하기 위해서는 동적 특성의 분석이 필수적이지만 지금까지의 연구에서는 형상기억합금의 물질 및 재료적 특성은 많이 보고되고 있으나 동적 특성에 대한 연구는 매우 부족한 실정이다. 본 논문에서는 비저항(resistivity)이 큰 NiTi합금 와이어(wire)를 이용하여 나선형 스프링(helical spring)을 제작하여 디지털 힘 측정기(Digital force gauge)와 적외선 온도센서(Infrared themometer) 그리고 레이저 변위 센서(Laser displacement sensor)를 이용하여 이 NiTi 스프링의 힘의 크기와 반응속도, 온도와 변위를 측정하여 형상기억합금의 동적 특성을 분석하였다. 또한 형상기억합금을 이용하여 차동식 액츄에이터를 제작하여 그 동적 성능을 실험하였다. In the recent years, as the research and the development of micro and precision machinery become active, the interest of micro actuators using SMA(Shape Memory Alloy) has been increased. The dynamic characteristic analysis of SMA is necessary for actuator application and many common researches report the material characteristics of SMA sufficiently. However, the research on dynamic characteristics is very deficient. In this paper, the helical spring are fabricated with NiTi SMA wire of high resistivity. The force, response speed, temperature, and displacement are measured by digital force gauge, infrared thermometer, and laser displacement sensor so that the dynamic characteristics of this SMA is analyzed. Also, bidirectional actuator was fabricated and experimented for its performance.

표면곡률을 이용한 물체의 형상특징추출

조동욱,김지영,박웅규,윤상균,이성석,김태우 西原大學校 1992 西原大學 論文集 Vol.29 No.-

In this paper, a new shape feature extraction method of the objects using surface curvatures is described. First, the values of the H & K are calculated from range data as given input. Then objects are assigned in the form of 8 primitives by the signs of the H & K values. But existing methods have the difficulties with the complex object. Therefore, We propose the method for the complex primitives such as cone ridge and cone valley. Finally, the effectiveness of this paper is demonstrated by several experiment.

조명광원의 색온도와 조도 및 스펙트럼 측정

최대욱,박성진,임춘우,석성수,오철한 慶北大學校 師範大學 科學敎育硏究所 1999 科學敎育硏究誌 Vol.23 No.-

The peak wavelength and temperatures of W-Halogen standard light source were measured by using the modified Wien's Law. In the case of graybody, the emissivity ε should be taken into account in using the Wien's Law. In the experiment, PDA spectroscope was used for the measurement of peak wavelength of intensity distribution of spectrum. As the current of light source increases from 5A to 7.4A, the peak wavelength of intensity distribution of the spectrum decreased from 717nm to 690nm, and temperature increased from 3127K to 3330K. Illuminations of three-wavelength lamps and light source were also measured. It was found that irradiation spectrum of those three-wavelength lamps are not coincident to blue(450nm), green(550nm) and red(610nm).

근로자의 화학물질 노출관련 기록 보존에 관한 연구

오상민 ( Sang Min Oh ),박동욱 ( Dong Uk Park ),유성재 ( Seoung Jae Yu ),정진우 ( Jin Woo Jung ),임경택 ( Kyung Taek Lim ),이재환 ( Jae Hwan Lee ),하권철 ( Kwon Chul Ha ) 한국산업위생학회 2013 한국산업보건학회지 Vol.23 No.4

Objectives: Employee exposure record refers to a record containing information about environmental(workplace) monitoring or measuring of a toxic substance or harmful physical agent. The aims of this study were to examine problems related to exposure records and provide some amendments to the Korean Industrial Safety & Health Act for the effective management of chemical substances under the law. Methods: This study performed a literature search and review on legal provisions related to exposure records of a number of different countries, including Korea, the USA, Japan, EU, Germany, and the UK. They were compared and investigated and the amendment of articles was suggested. Results: The results of this study were provided as suggested amendments to the related act. There were a variety of ways of improvement, including a 30-year retention period and the introduction of new access methods, contents, transfer, and maintenance methods. All exposure data elements have to be standardized, including reference to a similar exposure group(SEG), sampling strategy, and circumstances of exposure(e.g., date, shift length, use of personal protective equipment, etc.). The SEGs are described by process, job, task, and environmental agent. Conclusions: This study is expected to provide for the amendment of the related act in order to ensure effective management of exposure records and is helpful for solving the cause and result of occupational disease by keeping exposure records according to the Industrial Safety & Health Act.

구륜이동로보트의 기구학적 보정과 모터 제어기의 가속도 제약을 고려한 속도 궤적의 설계

文鍾寓,白祥煜,朴世承 朝鮮大學校 電子情報通信硏究所 2003 電子情報通信硏究所論文誌 Vol.6 No.2

This paper presents the kinematic correction method for wheeled-mobile robots with 2 d.o.f. and a design of the velocity trajectory for wheeled-mobile robots' line-travelling. We derive the relative wheel-weight and the absolute wheel-weight to correct radius of both wheels. And we use the curvature angle to correct displacement of wheel base. We show that wheeled-mobile robots can't move along the straight-line perfectly and prove that it is attributed to the acceleration constraint of motor controllers and the velocity trajectory have to get a change of velocity in order that wheeled-mobile robots may converge to the straight line. To prove justification and efficiency of methods proposed in this paper, we experiment on the wheeled-mobile robots with 2 d.o.f. and discuss results.

악교정 수술을 위해 내원한 환자의 심리 상태에 대한 평가

손우성,박우경,김욱규 대한치과교정학회 1998 대한치과교정학회지 Vol.28 No.2

악교정 수술환자들의 술전 정신심리상태를 평가하기 위하여 술전교정치료를 받고 있는 환자 67명을 대상으로 SCL-90-R을 검사하였다. 남성환자는 40명이었으며 여성환자는 27명이었다. 남성, 여성환자의 인성특징 비교를 위해 t-test를 이용하였다. 본 연구의 결과는 다음과 같았다. 1. 술전 환자군, 남성환자군, 여성환자군 모두에서 SCL-90-R의 9가지 임상척도가 정상범주에 해당 하였다. 2. PHOB scale(공포불안)에서만 남성환자군의 T-score가 여성환자군보다 높았다.(P<0.05) 3. 모든 T-scores가 정상범주에 놓여 있었으나, 9명의 환자(전체환자의 13.4%)는 적어도 한 개의 임상척도에서 비정상적인 범주에 놓여 있었다. This study was undertaken to evaluate the psychosocial status of the preoperative orthognathic surgery patient through SCL-90-R. Subjects used in this study were composed of 67 patients under presurgical orthodontic treatment. Males are 40 and females are 27. comparison between the personality characteristics of male and female patients was made by the t-test. From this study, the results were as follows. 1. In preoperative patients group, all T-scores were within the normal range. 2. In male patients group, all T-scores were within the normal range. 3. In female patients group, all T-scores were within the normal range. 4. Only in PHOB scales, the T-scores of male patients group were higher than those of female patients group. 5. Although all T-scores were within the nomal range, 9 patients(13.4% of all patients) shows abnormal T-scores in at least one scale.(T>65)

피씨비(PCB) 中毒에 미치는 프라센타(Placenta)의 效果

洪思澳,李香雨,鄭相允 成均館大學校 1983 論文集 Vol.33 No.-

This study was undertaken to investigate the effects of placenta on the toxicity of KC-400 in rabbits. Rabbits were treated with 800㎎ of KC-400 in 2㎖ olive oil via IP injection intermittently day after day for a week and were successively administered with 2㎖ of the placenta extracts via I. V. injection twice a day after day as well as with the placenta extracts with 50 ㎎ of vitamin C as well. The results obtained in this experiment were as follows: 1. When the experimental animals were treated with human placenta, there wasn't any alteration of the hematochemical indicators such as RBC, WBC, Hgb, Het, serum Cholesterol, s-GOT, s-GPT, serum Alkaline Phosphatase and Total lipids in serum. 2. According to the experiment of PCB poisoning, while s-C, s-GPT, s-ALP, and s-TL were increased, RBC, WBC, Hgb and Het were decreased during the experimental periods respectively. 3. The placenta extracts normalized the hematochemical indicators of the PCB poisoned animals after one day treated by the placenta extracts. 4. The combined treatment with the placenta extracts and vitamin C was the same effect as the single placenta treatment only; they were not significant in the t-test. 5. The placenta extracts inhibited the serum tyrosinase activity of the rabbits which was induced by PCB in vivo and in vitro respectively. By the combined treatment with the placenta extracts and vitamin C, the activity of tyrosinase was remarkably inhibited in comparison with the single treatment with the placenta alone.

Stacking Crane의 자동 주행을 위한 제어기 설계에 관한 연구

최성욱,김정호,이창훈,이진우,이영진,이권순 동아대학교 정보기술연구소 2001 情報通信硏究所論文誌 Vol.9 No.1

During the operation of crane system in container yard, it is necessary to control the crane trolley position and loop length so that the swing of the hanging container is minimized. Recently an automatic control system with high speed and rapid transportation is required. Therefore, we designed a controller to control the Stack crane system.

沙蔘의 化學的 成分에 關한 硏究

백숙은,우상규,김만욱 漢陽大學校 韓國生活科學硏究所 1991 韓國 生活 科學 硏究 Vol.- No.1

The proximate composition, free sugar, crude saponin fatty acid and minerals of wild and cultivated Codonopsis lanceolata and wild Adenophora triphylla were analyzed. The Condonopsis lanceolata (C.L.) had higher contents of crude fat and reducing sugar, smaller contents of crude protein and ash as compared with Adenophora triphylla (A.T.). In the free sugar content, C.L. had higher content of fructose as compared with A.T. Cultivated C.L. and wild A.T had higher contents of sucrose as compared with wild C.L. Maltose was detected only in the cultivated C.L. and its level was 0.18%. The content of crude saponin were 1.31% in the wild C.L., 1.58% in the cultivated C.L., and 0.55% in the wild A.T. The main fatty acid in the C.L. and the A.T. was linoleic acid and followed palmitic acid, linolenic acid. Unsaturated fatty acid in cultivated C.L., and wild A.T. was 63.76%, 57.93%, and 69.58% respectively. The richest mineral in C.L. and A.T. was K and followed by Ca. Wild C.L. and wild A.T. had higher contents of Na, Ca, Mg, Fe, Zn, Cu as compared with cultivated C.L.