인터넷을 통한 연구센터 데이터베이스 시스템 구축

황의천,김일남,김남호,이봉형,왕수현 강원대학교 석재복합신소재제품연구센터 1997 석재연 논문집 Vol.2 No.-

본 연구의 목적은 석재복합 신소재제품 연구센터의 데이터베이스를 인터넷상에서 구축하여 이 데이터베이스가 연구활동 및 산업지원활동을 지원하도록 하는데 있다. 연구센터와 관련된 데이터베이스를 인터넷상의 세계정보망(world-wide web)이 연계 및 등록시켜 적극적으로 연구소의 활동을 홍보함과 동시에 세계정보망을 통한 각국의 다소 산업체의 산업정보를 실시간(real time)에 검색할 수 있는 정보망을 구축할 것이다. 석재복합 신소재제품 연구센터의 연구활동, 연구결과와 관련 산업체의 활동들을 데이터베이스화한 뒤, 이를 인터넷상에 제공함으로써 연구소의 연구활동 및 관련산업체들의 활동을 국제적으로 홍보하며 각국의 수요와 온라인으로 상담 및 전자우편을 나눌 수 있으므로 해서 지역경제의 국제화를 맞을 것으로 기대된다. 또한 앞으로 있을 정보고속도로의 구축과 활용을 위하여 본 연구는 기여하게 될 것이다. The purpose of this study is to construct the database of RRC research center on internet to support the research activities and industrial activities. Registering the database on internet, the center will proactively advertise the local industrial activities and will construct the information network which will enable the real-time search for industrial information. The database will include RRC's research activities, research output, and related industrial's activities. The homepage will advertise the RRC's activities worldwidely, support the online business, provide the e-mail, and it will enable the research center to be the leader of internationalization of local economy. The study will also contribute to further study of information highway.

2차 시지연 모델을 이용한 PID 제어기의 동조

황형수,류영국,모영승 원광대학교 2001 論文集 Vol.26 No.-

제어계의 축소 모델을 구하는 방법을 이용하여 Wang등은 다양한 동특성을 갖는 공정들에 대하여 범용적으로 적용할 수 있는 PID 동조 알고리즘을 제안하였다[7]. 그러나 Wang이 제안한 방법은 공정모델에 영점이 존재하지 않는 경우와 Nyquist선도가 -π/2및 -π를 지나는 경우에는 잘 적용이 되지만 공정모델에 영점이 존재하는 경우에는 동조 성능이 만족스럽지 못하였다. 본 논문에서는 공정 모델에 영점이 존재할 경우 Pade 축소법을 응용함으로써 이를 개선한 방법을 제안하였다. 이 방법은 저차 및 고차, 크고 작은 지연시간, 단조롭거나 진동하는 응답등의 다양한 동특성을 갖는 공정들에 범용적으로 적용할 수 있으며, 시뮬레이션을 통하여 이 방법이 다양한 공정에 우수한 특성을 나타냄을 보였다. The PID tuning algorithm which can applied generally to processes with varies dynamic characteristics is proposed by Wang[7]. However, it can be applied well to process model without zeros and with ∠G(jw)=- π/2 and - π point in Nyquist curve, but it gives unsatisfactory tuning performance for processes with zeros and without ∠G(jw)=- π/2 and - π in Nyquist curve. In this paper, the method which improve it using Pade reduction method is proposed. Satisfactory responses can be expected for processes with various dynamics, including those with low or high order, small or large dead time, monotonic or oscillatory responses. Simulation examples are given to show the effectiveness and flexibility of the controller in handling processes of different characteristics.

C_3 및 C_7위치에 치환된 새로운 세파로스포린 化合物의 合成과 抗菌活性(Ⅰ)

황화영,하재천,김영수,고옥현,강형룡 조선대학교 약학연구소 1994 藥學硏究誌 Vol.16 No.1

The synthesis and antimicrobial activity of cephalosporin having (Z)-2-(2-aminothiazol-4-yl)-2-trityloxyiminoacetamido group and 5-(2-chlorophenyl)-4-phenyl-4H-1, 2, 4-triazol-3-thiomethyl group on the C_3 and C_7 position of the cephem ring, respectively are descrived. This compound was tested for antimicrobial activity in vitro against Candida albicans ATCC 10231, Bacillus subtilis ATCC 6633, Micrococcus luteus ATCC 9341, Staphylococcus aureus ATCC 6538P, Mycobacterium phlei IIP-IPH, Escherichia coli KCTC 1039, Escherichia coli ESS, Klebisiella pneumoniae KCTC 1560, Salmonella typhymurium TV-119, Pseudomonas aeruginosa IFO 13130. The antimicrobial activity of synthetic compound was better as compare with cefotaxime and cefazoline against Micrococcus luteus ATCC 9341 & Escherichia coli KCTC ESS.

Gamma 표를 이용한 개선된 Pade'간략법

황형수 圓光大學校 1992 論文集 Vol.26 No.2

The problem of reduced-order modeling of high, linear, time invarient, single input single output system is considered. In this paper, a new method which composed the Pade' approximation based on simple in computational process and the Routh approximation base on stability is proposed. This method need not reciprocal transformation and is very simple in computational process and would satisfied the stability of reduced model if the original system model is stable.

전문가 시스템을 이용한 제어기 설계

황형수,김성중,이창구 圓光大學校 1990 論文集 Vol.24 No.2

PID제어기의 동조방법에 대한 이론적인 발전에도 불구하고 PID 제어기가 좀더 좋은 성능과 견실성을 유지하기 위해서는 수동 동작과 자동 동작의 매끄러운 연결, 계수 변화에 따른 과도현상, 비선형 Actuator의 영향, 적분항의 Wind-up, 그리고 극한값의 선정등에 대한 현장 엔지니어의 경험 지식이 제어 알고리즘에 반영되어야 한다. 제어시스템에 현장 운전자의 경험 지식을 효율적으로 반영하기 위한 방법으로 인공지능(Artificial Intelligence)의 전문가 시스템을 이용하였다. 본 논문에서는 논리부분과 수치 알고리즘 부분이 분리된 지식기반 제어기를 구성하였다. 이 방법은 IBM-PC상에서 설치되도록 하였으며 IBM-PC와 통신기능을 갖는 Programmable Controller에 연결하여 PID 제어계수를 자동 동조하도록 하였다. 이 방법은 공정조건이 변하거나 동특성을 갖는 공정제어에서 우수한 특성을 보인다. The idea of expert control is to incorporate a rule based expert system in a feedback control system. In this paper, the expert system concepts are instead used as an element of the feedback loop in a single controller. The algorithms are coded in as pure from as possible and the heuristic logic is implemented as rules. This paper reports on effort to produce an implementation of an expert controller on microcomputer based system, including an industrial programmable controlled.

유산양 유방염에 대한 Chitosan 약침의 치료 효과

황수현,서진석,김덕환,김명철,신상태,전무형,南三郞,김영찬,이우근,표수일 충남대학교 수의과대학 동물의과학연구소 1999 動物醫科學硏究誌 Vol.7 No.-

To improve the therapeutic method for mastitis, treatment effect of chitosan pharmacopuncture was examined in three milking goats(A,B and C). Mastitis was artificially induced in two milking goats(A and B) and one goat(C) was naturally infected case with mastitis. The acupoint used was Yang-Ming and chitosan suspensions(provided from Tottory University, Japan: 30㎎ of chitosan/㎖)were injected to the acupoint with 5㎖/time for 3 days, respectively. As for the change of somatic cells in milk along with chitosan pharmacopuncture, they showed a decreasing tendency after increase on the 3rd day in all udders of B. In addition, as for the change of total leukocyte counts of peripheral blood with chitosan pharmacopuncture, they showed a decreasing tendency after increase on the 3rd day in B and C except A which showed a increasing tendency until on the 7th day. In the change of neutrophil/lymphocyte(N/L) ratio, increasing tendency was seen in A and C but increasing tendency after slight decrease was observed in B. Further, in the change of serum total protein and A/G ratio, serum total protein content was decreased after slightly increase on the 3rd day in A, and they were decreased after increase until on the 7th day in B and C, respectively. As for the change of A/G ratio, different pattern increasing tendency was shown in A, B and C.

Clenbuterol 경피흡수제제의 항천식 효과

안형수,황인숙 동덕여자대학교 종합약학연구소 2001 동덕약학연구지 Vol.5 No.-

Antiasthmatic effects of clenbuterol transdermal preparation were evaluated in guinea pig. In vitro organ bath experiments, pD2 value of clenbuterol on the isolated trachea dilation effects in ginea pig was 8.0. The trachea dilation effects of clenbuterol showed tachyphylaxis and epithelum dependent trachea dilation. These results suggested that chronic use of clenbuterol may induce tolerance and the effect of bronchodilation of clenbuterol would be reduced in severe asthmatic patients who have impaired epithelium cell of bronchi. In vivo experiment, clenbuterol transdermal patch preparation (5 Cm2) recovered histamine-induced reduction of tidal volume and minute volume during carbon dioxide inhalation until 72 hours later. This result was simliar to the effect of clenbuterol 10㎎/㎏ oral administration after 3 hours. The maximum effect of clenbuterol transdermal preparation in the increase of respiratory volume resulted at 6 hours later. Clenbuterol transdermal preparation significantly inhibited the capsaicin-induced cough in guinea pig until 48 hours later. These results suggested that bronchdilatory effects of clenbuterol transdermal preparation would be continued more than 48 hours, while the skin irritation was mild.

중등영어 교육에서의 발음교육의 문제점과 그 개선책

김형수,소화경,이형팔,황규상 전주대학교 교육문제연구소 2001 敎育論叢 Vol.16 No.-

하악 제3대구치와 하악관과의 위치관계에 대한 파노라마 방사선사진과 cone beam형 전산화단층영상의 비교

최형수,김규태,최용석,황의환 대한구강악안면방사선학회 2008 Imaging Science in Dentistry Vol.38 No.3

Purpose : To assess the diagnostic accuracy and value in an imaging technique field through the comparison of cone beam computed tomography and conventional panoramic radiography in assessing the topographic relationship between the mandibular canal and impacted third molars. Materials and Methods : Participants consisted of 100 patients offered the images through cone beam computed tomography and panoramic radiography. PSR-9000 Dental CT system (Asahi Roentgen Ind. Co., Ltd, Japan) was used as the unit of cone beam computed tomography. CE-II (Asahi Roentgen Ind. Co., Ltd, Japan) and Pro Max (Planmeca Oy, Finland) were used as the unit of panoramic radiography. The images obtained through panoramic radiography were classified into 3 types according to the distance between mandibular canal and root of mandibular third molar. And they were classified into 4 types according to the proximity of radiographic feature. The images obtained through cone beam computed tomography based on the classification above were classified into 4 types according to the location between the mandibular canal and the root and were analyzed. And they were classified into buccal, inferior, lingual, and between roots, according to the location between mandibular canal and root. The data were statistically analyzed and estimated by χ²-test. Results : 1. There was no statistical significance according to 3 types (type l, type ll, type lll) through CBCT. 2. The results of 4 types (type A, type B, type C, type D) through CBCT were as high prevalence of CBCT 1 in type A, CBCT 2 in type B, CBCT 3 in type C, and CBCT1 in type D and those of which showed statistical significance (P value=0.03). 3. The results according to location between mandibular canal and root through CBCT recorded each 49, 25, 17, 9 as buccal, inferior, lingual, between roots. Conclusion : When estimating the mandibular canal and the roots through the panoramic radiography, it could be difficult to drive the views of which this estimation was considerable. Thus it is required to have an accurate diagnostic approaching through CBCT that could estimate the location between mandibular canal and roots.

머리염색이 인체에 미치는 영향

윤형식,황성호,이현륭,김수호,박연석,권낙현,정호진,김동훈,노현주,홍성호,박병찬,이관,정해관 東國大學校醫學硏究所 2002 東國醫學 Vol.9 No.1

일상생활에서 모발염색은 흔히 접할 수 있는 미용의 한 종류로 특히 젊은층을 중심으로 폭발적으로 유행하고 있다. 염색을 위항 사용하는 약제는 표백제와 발색제 등 각종 화학약품이 사용되고 있으나 이로 인한 건강장해에 대한 연구는 그리 많지 않다. 저자들은 염색이 인체의 모발건강에 미치는 영향을 파악하기 위하여 염색과 관련된 주관적 증상과 모발의 변화에 대한 실험적 연구를 시행하였다. 동국대학교 경주 캠퍼스 재학생 80명을 대상으로 설문조사를 시행하여 염색 유 ·무 및 염색 후에 경험한 증상에 대해 설문 조사하였고, 의과대학 재학생 46명을 대상으로 피부 반응 테스트를 실시하였다. 또한 염색 전후의 모발 탄성도를 측정하였고 모발의 상태를 파악하기 위해 전자 현미경검사를 실시하였다. 설문조사 결과 염색 전에 비하여 염색 후 안구혼탁, 안구건조, 시력저하, 발진 및 접촉성 피부염, 모발손상, 모근손상 등의 증상을 더 많이 경험한다고 호소하였다(p<0.05). 모발손상과 모근손상은 헤어드라이어 사용 빈도에 따라 증가하는 것으로 조사되었다(p<0.05). 피부반응검사에서 가려움증이 가장 많은 증상이었으며 이는 여성보다는 남성에서 높은 것으로 조사되었다. 염색 전후의 모발장력은 염색 전 134.5±10.37g, 염색 128.0±30.69g, 염색 이틀 후 112.5±19.69g으로 나타났다. 염색 전후의 모발의 전자현미경 케라틴 층이 현저히 감소하고 모발이 가늘어지는 차이를 보였다. 염색은 모발손상, 모발 케라틴 손상 및 모근 손상, 발진 및 접촉성 피부반응, 안구혼탁, 안구건조, 시력 저하를 유발한다. 따라서 염색약으로 인한 손상에 대한 주의와 예방이 필요하다고 생각한다. 예방대책으로 염색 전 피부테스트를 통한 적합성 여부를 판단하는 것이 필요하며 가급적 염색을 피하는 것이 좋을 것이다. 염색약에 발암물질이 포함되어있다는 보고도 있어 염색 제조사의 철저한 실험과 염색 물질의 선별이 염색으로 인한 부작용을 최소화하는데 중요한 역할을 할 것이다. Hair coloring has became one of the most popular cosmetic activities to younger generations during last decade. However, there are few studies on the health effect of widespread use of chemical dyes. This study was conducted to study the effects of hair coloring dye on hair and other systems. We conducted a questionnaire survey of 80 persons in Kyongju campus, Dongguk University. We have done open patch skin test on 46 medical students. We also conducted scanning electron microscopy to examine the hair strength and structure before and after hair coloring process. Injury of hair and hair bulb, contact dermatitis, turbid eyes, xerophthalmia, and poor visual acuity were the main symptoms complained after hair coloring (p<0.05). Injury of hair and hair bulb were increased by frequency of hair-dryer use(p<0.05). In open patch test, pruritus was complanined by more than half of the subjects. Mean strength of hairs before and after hair coloring was as follows; 134.5 (SD 10.37)g before hair coloring, 128.0 (SD 30.69)g immediately after hair coloring, and 112.5 (SD 19.69)g after two days. The scanning electron microscopic findings of hair surface before and after hair coloring showed decreased keratin layer and thinning of the hair. Hair coloring induces injury to hair, its keratin layer, and hair bulb as well as contact dermatitis, turbid eyes, xerophthalmia, and poor visual acuity. Therefore, we think that precaution is needed in use of hair coloring dye. To prevent complications induced by hair coloring dye, it is necessary, especially to those with allergy or skin disorders, to perform skin test before action and avoid hair coloring whenever possible. Longterm health effects of hairdye should be studied and manufacturing companies should try to minimize complications induced by hair coloring dye.