차동 플로팅매스형 전자 트랜스듀서를 이용한 이식형 인공중이의 실험적 평가

송병섭,김명남,조진호,정주영,김동만,이건일 경북대학교 전자기술연구소 2001 電子技術硏究誌 Vol.22 No.2

Recently, implantable middle ear hearing system have attracted hearing impaired person's attention because it can overcome the disadvantages of conventional hearing aids such as sound distortion, sound feedback and howling effect. In this study, implantable middle ear hearing system, using DFMT(differential floating mass type) transducer that has two magnets glued with the same pole facing was evaluated by performing several experiments. The results of vibration experiments using DFMT transducer showed several advantages such as high vibration efficiency, good frequency response, minimal influencing by external magnetic flux, etc. And the results of the ABR(auditory brainstem response) test using guinea pig proved the performance of transducer in the animal's body and the possibility of clinical application of the implantable middle ear system for mild to severe hearing loss patients.

제 2 형 당뇨병에서 미세혈관 합병증과 대혈관 합병증의 대비

강문호,이기영,정연실,김홍규,서찬종,송광식,박혜영,이원기 대한당뇨병학회 2001 Diabetes and Metabolism Journal Vol.25 No.2

Background: Type 2 diabetes is a heterogeneous disease. As to its complications, microangiopathy predominantly develop in some patients while macroangiopathy is more predominant in others. Therefore, this study was performed to identify the factors associated with such dissociation. Methods: Type 2 diabetic patients were classified into the macro and microangiopathy groups by carotid intima-medial thickness (IMT) and the presence of severe diabetic retinopathy. Patients with IMT ≤ 0.83 mm and severe NPDR or PDR were assigned to microangiopathy group; those with IMT 0.84 mm and no diabetic retinopathy were assigned to macroangiopathy group. Of 95 patients studied, 14 were classified as microangiopathy group and 20 as macroangiopathy group. Results: When the microangiopathy and macroangiopathy groups were compared, the microangiopathy group were significantly younger at the time of examination and at the onset of diabetes, and had longer duration of diabetes. Percentage of patients receiving insulin treatment was significantly higher and plasma C-peptide significantly lower in the microangiopathy group. However, HDL-cholesterol levels were significantly lower in the macroangiopathy group. Furthermore, the multiple logistic regression analyses revealed that younger onset of type 2 diabetes was an independent factor that was associated with the acceleration of microangiopathy. Conclusion: This study suggests that the age at onset of diabetes is an important independent risk factor that is associated with predominant development of microangiopathy in type 2 diabetic patients.

변형된 트랜스듀서 및 FM을 이용한 이식형 인공중이 시스템의 전력효율 개선

윤영호,원철호,송병섭,정영숙,김명남,박세광,이상흔,조진호 경북대학교 전자기술연구소 1997 電子技術硏究誌 Vol.18 No.2

In design of implantable middle ear system, it is necessary that the system has a high power-transfer efficiency because die internal circuit of the system has no power source. The FM transmission method transfers the signal power more efficiently than AM method because AM signal has large carrier component which act as the loss. Therefore, an implantable middle ear system using FM transmission and receiving method is proposed. And the new shape of vibrating transducer which vibrate more efficiently than the conventional type was designed. This tranducer is consisted of coil and small T-type cylindrical permanent magnet. The differences between conventional methods and proposed methods are investigated and compared through quantitive analysis. The advantages of proposed methods are proved by experiments.

B . C . G 접종후 속발된 심상성 낭창양 (狼瘡樣) 반응의 1 예

송준영,서정희 대한피부과학회 1979 大韓皮膚科學會誌 Vol.17 No.1

B.C.G. is a living attenuated vaccine which produces resistance to tuberculous infection. Until now, several million persons were vaccinated with B.C.G., the rnajority being between 7 and 14 years of age. A very small number of general fatal reaction have been reported but from an epidemiological view point this does not; serions dirninish. the importance of B.C.G. Vaccination in the fight against tubereulosis. Dermatological complication of R.C.G. are rarely seen. Specific reactions attributed to the Vaccination were excessive lymphadenitis, scrofuloderma like, Iupus vuIgaria like, lichen nitidus lesion and tuberculid type lesion. Non specific reactions include toxicoderma hemorrhagica, urticaria, erythema multiform, erythema nodosum and granuloma anulare. Literature was briefly reviewed comparision of clinical and histological findings with this particular case. We are going to report one case of lupus vulgaris like reaction after B.C.G. Vaccination.

코로나 대전된 복합절연재료의 표면상태가 전위감소에 미치는 영향

황명환,정재희,조한구,송진호,이덕출 한국산업안전학회 1997 한국안전학회지 Vol.12 No.2

Especially, Fiber glass Reinforced Plastics(FRP) is the best composite insulating material which has been so far. Therefore, it's worthy of notice to investigate on the corona electrified composite insulating material by surface condition. And then some other materials will be focussed on. In this study, charge decay were measured with charging-time and grid voltage on FRP composite material surface in order to analyze the mechanism. As a result we have studied that the way of the composite glass fiber(GF) and Polymer and the condition of the contaminated surface was different. In case of the GF is mixed with vertical, charge decay speed is fast because the charge is easily leaked. On the other hand, the surface charge decay speed is depend on conductive or insulated of the contaminant.

암-특이 항원인 alpha-Fetoprotein 에 대한 모노클론항체의 생산 및 분석

박대규,방옥선,강신성,조동택,송방호 경북대학교 유전공학연구소 1987 遺傳工學硏究所報 Vol.2 No.1

Monoclones secreting anti-human alpha-fetoprotein(AFP) were produced by hybridizing SP 2/0-Ag 14 mouse myeloma cells with spleen cells of Balb/c mice immunized with AFP. Two subclones (D-6 & E-6) were expanded as ascite tumors in syngenic mice, and immunoglobulins were purified from ascitic fluid. Each antibody was identified to be homogeneous monoclonal antibody (McAb) by several criteria, and the affinity constant of D-6 and E-6 McAb to AFP was calculated to be 4.2×10^(-8) and 6.4×10^(-8) M^(-1), respectively. With these McAbs sensitive and accurate enzyme linked immunosorbent assay method was established.

Acquired Malalignment of the Big Toenail

김태현,송동훈,안성구,최응호,최수임 대한피부과학회 1997 大韓皮膚科學會誌 Vol.35 No.6

In congenital malalignr;ient of the big toenail, the nail plate is deviated laterally with respeet to the longitudinal axis of ihe distal phalanx. In addition the nails exhibit transverse ridging, discoloration, thickened with gradual tapering of the distal portion. We present a case of a 70-year-old male who has had this nail problem for 7 years. The appearance of his nail was the same as congenital malalignment of the big toenail except that it was acquired. (Korean,3 Dermatol 1997;35(S): 1212-1214)

Bupivacaine이 Methemoglobin 형성에 미치는 영향

송윤재,박찬진 대한마취과학회 1982 Korean Journal of Anesthesiology Vol.15 No.1

Midazolam maleate, a water soluble banzodiazepine unlike diazepam, was synthetized by Walser and Fryer in 1975. In order to ealuate the effectiveness as an induction agent for general anesthesia, 22 elective surgical patients belonging to ASA classification 1 and 2 were selected. And ten patients (male 7, female 3, average 33.5 years old) were induced with midazolam maleate 0.2mg/kg and twelve patients (mdale 7, female 5, average 32.5 years old) with diazepam 0.3mg/kg. The results were summarized as follows. 1) Anesthesia was induced in all of midazolam group by one intravenous injection, but only 6 patients of diazepam group could induced by one injection and the other 6 patients needed 2 or more injections. 2) The changes of blood pressure and pulse rate after induction and intubation were almost similar in the two groups, but greater individual variation was seen in diazepam group. 3) A buring sensation following intravenous injection was noted in 11 cases of diazepam group, but none in midazolam group and no phlebitis in either group. From the above results, diazepam and midazolam are almost similar in nature but midazolam is definitely effective as an induction agent and has less side effects. Therefore midazolam maleate is regarded as a more effective agent than diazepam as an induction for general anesthesia.

Trichoepithelioma 1 예

송준영,김윤원 대한피부과학회 1975 大韓皮膚科學會誌 Vol.13 No.3

Trichoepithelioma is a heritable disorder of non sex linked autosomal dominant trait. A case of 31 years old male with trichoepithelioma is reported. The skin lesions are characterized by multiple waxy shiny, skin colored, firm papules scattered on the nasolabial folds, forehead and eyelids. Seven of his family, four males and three females, through three generations have similar skin lesions. Literatures are briefly reviewed for discussion of clinical and histopathological findings of this disease.

Erythema elevatum diutinum 의 1 예

송준영,김윤원 대한피부과학회 1978 大韓皮膚科學會誌 Vol.16 No.3

A case of 40 years old female with E.E.D. is reported. The skin lesions were chare,- cterized by persistent several hard, reddish blue colored, dome and flatten shaped plaques on tbe dorsal surface of left band and left lateral malleolar area. Histopathological examination showed leukocytoclastic angiitis with neutrophils and their fragments in the walls of the small vessels and their immediate perivascular area of the dermis. Dermal infiltrate was polymorphous, with lymphocytes, and histiocytes, but the overwhelming majority were neutrophils, and the eosinophilic hya line material was noted witbin and around the vessel walIs. She was treated with D.D.S. for 3 months and favorable effect was noted. Literr-atures are briefly reviewed for discussion of clinical, histopathological findings and treatment of this disease.