금속사출성형에 의한 중합금 소결체 부품 제조에 관한 연구

여환균,김병진,김길수,김성훈,송준호,한관희 嶺南大學校 工業技術硏究所 2003 工業技術硏究所論文集 Vol.31 No.2

In this study we demonstrate that a small complex part of a tungsten-based heavy alloy (W-Ni-Cu) can be readily manufactured by utilizing the metal injection molding (MIM) technology. We use a simple thermoplastic binder system, containing low density polyethylene, paraffin wax, and stearic acid. To remove the organic binder from the molded part, we employ the solvent extraction and thermal debinding processes. Densification of debound parts is achieved by sintering in hydrogen atmosphere. The experimental results of the optimization of process variables to manufacture the heavy alloy part are described, with a brief discussion.

Lithium을 장기적으로 복용한 후 갑상선기능항진증의 검사소견을 보이는 증례 1례

여도환,이성동,최용성 大韓神經精神醫學會 1998 신경정신의학 Vol.37 No.5

저자들은 lithium 사용 후 goiter와 갑상선기능저하증은 치료 경험상 간혹 접하나 갑상선기능항진증의 예는 처음 접하였기에 문헌 고찰과 함께 보고하였다. 정신과 영역에서 lithium의 사용은 매우 빈번하며 그 부작용은 비교적 자세하게 소개되어 있는 편이나 갑상선기능항진증을 일으키는 부작용에 대해서는 매우 드물게 소개되어 있다. 이 예에서는 갑상선기능선항진증이 장기간의 lithium 사용 후에 가역적으로 발생하고 lithium 사용 중지 후에는 정상치로 돌아옴을 보여주고 있다. The authors report one case of hyperthyroidism that occurred in a 56-year-old woman with bipolar disorder after 3 years of chronic lithium treatment. The high level in thyroid function test returned to normal after discontinuation of lithium. This case is shows that lithium-induced hyperthyroidism can be reversible.

ANFIS를 利用한 送電線路의 故障判別 技法에 關한 硏究

呂相敏,金喆煥 성균관대학교 2002 학술회의지원논문목록집 Vol.2002 No.-

This paper proposes a technique for fault detection and classification for both LIF(Low Impedance Fault)s and HIF(High Impedance Fault)s using Adaptive Network-based Fuzzy inference System(ANFIS). The inputs into ANFIS are currents signals only based on Root-Mean-Squrare(RMS) values of 3-phase currents and zero sequence currents. The performance of the proposed technique is tested on a typical 154kV Korean transmission line system under various fault conditions Test results show that the ANFIS can detect and classify faults including(LIFs and HIFs) accurately within half a cycle.

자기조절초점과 제품유형이 비교 광고 노출에 따른 소비자 반응에 미치는 영향

여준상,송환웅 한국방송광고공사 2007 광고연구 Vol.0 No.77

Although many researches addressed the effectiveness of comparative advertising, the results of comparative ad. effects compared to non-comparative ad. were mixed and the researches on the reason of this complexity were little. Thus, this research applied self-regulatory focus and hedonic-utilitarian framework which are discussed frequently in recent years to explore the moderating role on comparative ad. effects, and predicted that persuasion knowledge would play roles as a potential mediator. 2(type of ad.: non-comparative/comparative) × 2(regulatory focus: promotion/prevention) × 2(type of product: hedonic/utilitarian) between subjects ANOVA demonstrated supports for our predictions. In case of the interaction hypothesis between ad. type and regulatory focus, subjects in promotion focus condition activated little persuasion knowledge about comparative ad., so the difference of post-exposure attitude between non-comparative ad. and comparative ad. was little. However, subjects in prevention focus condition activated much persuasion knowledge about comparative ad., so the attitude after exposed to non-comparative ad. was more positive than comparative ad.. In case of the interaction hypothesis between ad. type and product type, subjects in hedonic product condition activated little persuasion knowledge about comparative ad., so the difference of post-exposure attitude between non-comparative ad. and comparative ad. was little. However, subjects in utilitarian product condition activated much persuasion knowledge about comparative ad., so the attitude after exposed to non-comparative ad. was more positive than comparative ad.. 비교 광고의 효과성에 대한 논의는 지속적으로 이루어져 왔지만 기존의 비교 광고 연구를 살펴보면 일반 광고와 비교 광고 간의 효과 차이에 대한 의견이 혼재되어 있으며, 그러한 혼재 이유에 대해 명확한 설명을 해주는 연구가 많지 않다. 이에 본 연구는 일반 광고와 비교 광고에 대한 반응에 있어 조절적 영향을 미치는 요인을 찾기 위해 최근 사회 심리학과 소비자 행동에서 많이 논의되고 있는‘자기조절초점(self-regulatory focus)’과‘쾌락(hedonic)-실용(utilitarian) 제품유형’을 적용하였으며, 결과를 설명해주는 잠재적 매개 변수로‘설득지식(persuasionknowledge: 상술지각)’을 예상하였다. 2(광고유형: 일반 광고/비교 광고) × 2(조절초점: 촉진/방어) × 2(제품유형: 실용/쾌락) 집단 간 디자인의 실험 결과, 대부분의 결과가 가설과 일치되는 방향성을 보였다. 구체적으로 살펴보면, 우선 광고유형과 조절초점 간 상호작용 가설의 경우, 촉진초점에서는 비교 광고에 대한 설득지식 활성화가 약하여 일반-비교 광고 간 소비자 반응(광고태도, 브랜드 태도)에 차이가 없으나 방어초점에서는 비교 광고에 대한 설득지식 활성화가 강하여 비교 광고에 비해 일반 광고 노출 후 소비자 반응이 더 좋게 나타났다. 그 다음으로 광고유형과 제품유형간 상호작용 가설의 경우, 쾌락적 제품에서는 비교 광고에 대한 설득지식 활성화가 약해 일반-비교 광고 간 소비자 반응에 유의한 차이가 없으나 실용적 제품에서는 비교 광고에 대한 설득지식 활성화가 강해 비교 광고에 비해 일반 광고에 노출되었을 때 소비자 반응이 더 좋게 나타났다.

의식하 진정에 사용된 약물에 관한 임상적 연구

김상렬,김수관,여환호 대한악안면성형재건외과학회 2000 Maxillofacial Plastic Reconstructive Surgery Vol.22 No.4

The purpose of this retrospective study is to investigate the effects of conscious sedation in an outpatient setting. Data from 292 patients (154 males, 138 females), sedated for minor oral surgery, were studied using various parameters including age and sex distribution, as well as according to procedures and each drug group. Results show that this intravenous conscious sedation technique is a safe and effective method of controlling behaviour, but one has to be prepared to deal with any emergencies or complications. The specific results are as follows : 1.Most procedures (265/292) were used to Valium mixed with Demerol and Midazolam mixed with Demerol. 2.Valium revealed a high incidence of pain upon injection and symptoms limited to daily activity and thrombophlebitis. 3.Nausea and vomiting manifested in the procedure using Demerol. 4.The patient manifested comfort similar in response to the same drugs used in another treatment.

中等學校 科學敎師 養成制度 및 再敎育制度의 改善硏究

李相協,呂煥鎭 경북대학교 과학교육연구소 1980 科學敎育硏究誌 Vol.4 No.-

We studied a training system and retraining system for chemistry teacher in Western and Asia countries by means of comparing each nation's teacher training and retraining institude. We suggest a new model of training system and retraining system for chemistry teacher.

밤나무 耐寒性品種 選拔에 관한 연구

李麗夏,趙台煥,洪性珏 건국대학교 1976 學術誌 Vol.20 No.2

32 cultivars of chestnut were collected at the Kyunggido Forest Experimental Station, Oh-San, Kyunggido, Korea on November and December, 1976. The freezing resistance of winter bud, cambium and xylem parenchyma of the cultivars was measured to select out freezing resistant cultivars under the condition of early winter in Korea. The winter bud showed lowest freezing resistance among tissue parts. The xylen parenchyma attained relatively higher freezing resistance than the cambium did. On the basis of the freezing resistance of winter bud eleven cultivars which showed relatively high freezing resistance were selected among 32 cultivars of chestnuts. Again on the basis of the freezing resistance of cambium which is often one of the critical factors in winter damage, another eleven freezing resistant cultivars were selected. The eight cultivars which showed both freezing resistance of winter bud and cambium were chosen. These were in order from highest to lowest selected freezing resistant cultivars, wild chinese chest nut, Dan-Taeck, OK-Kwang, Bong-Eeh, Chuk-Pa, Da-Ap, Mahn-Juk, Ahn-Goon.

1,2-diaminocyclohexane 異性質體의 Pt(Ⅱ)錯物의 抗癌性에 대한 Extended Hu¨ckel Molecular Orbital理論

李相協,呂煥鎭,孫敬愛 慶北大學校 1986 論文集 Vol.42 No.-

Complex formation of metal ions in body is generally considered as first step mechanism of action of metal ions. Of platinum(Ⅱ) complexes, isomers of [PtL_2(dach)] have different antitumor activities, where L is Cl^-, Br^- and Co(oxalate)^2-, dach is 1,2-diaminocyclohexane. A different activity of isomer can't be explained by kinetic and thermodynamic method, but this study will give useful information in clarifying the order of antitumor activity by Extended Hu¨ckel Molecular Orbital Calculations. Calculations of Energy level, Energy partitioning and Overlap population density give evidence for the order of antitumor activity about isomers of [PtL_2(dach)]. The value of A_lg-B_1g energy difference (Δ_1) are lower in trans-isomer than those in cis-isomers, which are related to the stability of complexes. Also, it is greater than that in trans-ones, implying that trans-isomers have high anti cancer activity.

Eagle씨 증후군의 치험례

오승환,이상철,윤옥병,지유진,김여갑,류동목 大韓顎顔面成形再建外科學會 1996 Maxillofacial Plastic Reconstructive Surgery Vol.18 No.3

Eagle's syndrome is the term given to symtomatic elogation of the styloid process or mineralization of the stylohyoid or stylomandibular ligament. Since ossification of stylohyoid ligament at cadeva was fist described by De Manchetics in 1652 and Weinlecher described clinical symptom which produced by elongated styloid process and osteotomy of styloid process in 1872, Clinical symptom which include sensation of a foreign body on the pharynx, dysphagai, dysphonia, referred pain, and mouth opening disturbance was termed by Eagle as Eagle's syndrome. then, case reports of Eagle's syndrome are presented. in these cases, the patient's chief complaints included periauricular radiating pain, mouth opening disturbance, foreign body sensation, dysphagia, tenderness on the neck. Through vairous X-ray examination and palpation of tonsillar fossa, elongted styloid process were confirmed. Under the general anesthesia there were successfully removed out via transoral approach technique, described by Eagle. after resented styloid process, they were freed from the symptoms without further complication. Therefor we reported these cases treated by surgical resection of styloid process with good results.

두개내 합병증을 유발한 저작극 농양

이상철,김여갑,류동목,이백수,최유성,한승완,오승환 大韓顎顔面成形再建外科學會 1996 Maxillofacial Plastic Reconstructive Surgery Vol.18 No.1

Although the use of the antibiotics has minimized the dangers of the spread of odontogenic infection to adjacent important organs, sometimes the fatal cases, such as Ludwig's angina, mediastinitis, intracranial complications from the odotogenic infection, may be occurred. The odontogenic infections or oral and maxillofacial region may involve the intracranial area through systemic circulation or by direct spread into the intracranial cavity. Headache, malaise, loss of appetite, chills, fever, vomiting, apathy, and irritability are usually followed by more specific involvement of the nervous system. We experienced one patient who died of intracranial complication from odontogenic infection. So we report the case and the literatures about intracranial involvements following odontogenic infections and dental procedures.