二重歸還方式을 理用한 廣帶域 增幅回路의 設計

田炳實,趙正萬,김종교 全北大學校 1978 論文集 Vol.20 No.-

Many advantages are to be obtained from the use of negative feedback, at the cost of gain. These are as follows; the increase of frequency band-width, the improvement of amplification stability, the decrease of nonlinear distortion and noise, and the simplicity of impedance matching, etc. Many of electronic devices require wide frequency bands. For example, a cathode-ray oscilloscope, in order to cover the frequency range of 0 to 20 MHZ, requires an amplifier with the frequency band over 20 MHZ. Moreover, communication devices require the very wide frequency bands of several hundreds MHZ. A negative feedback is used widely in order to obtain the devices with wide frequency bands. This paper describes the analysis and the practical synthesis procedure of the design of shaped gain, wide-band, impedance matched, dual loop feedback amplifier that uses a cascade of two common emitter transistor stages. An amplifier is designed to have the lower cut-off frequency of 50MHZ. Experimental results are coincident to the specified characteristics as well.

Development of High Functional Black Resin Coated Electrogalvanized Steel Sheet for Digital TV Panel

( Du Hwan Jo ),( Moon Jae Kwon ),( Jae Hva Lee ),( Hee Seung Kang ),( Yongn Gvun Jung ),( Von Kvun Song ),( Min Hwan Jung ),( Soon Hvoun Cho ),( Veong Bong Cho ),( Myoung Rae Cho ),( Byoung Chon Cho ) 한국부식방식학회(구 한국부식학회) 2013 Corrosion Science and Technology Vol.12 No.1

Recently Digital TV industry has drastically been moving the illuminating system, which causes an obvious product change from PDP and LCD to LED model to provide high-definition image. Due to strong competition in the digital industry. TV manufacturers make a great efforts to reduce production cost by using low-priced materials such as steels instead of aluminum and plastic etc. In this paper we have developed a new low-priced electrogalvanized steel sheet, which has a black resin composite layer, to substitute conventional high-priced PCM steel and plastic mold for rear cover panel in the digital TV. The black resin composite was prepared by mechanical dispersion of the mixture solution that consists of high solid polyester resin, melamine hardener, black pigment, micronized silica paste, polyacrylate texturing particle and miscellaneous additives. The composite solution was coated on the steel sheet using roll coater followed by induction furnace curing and cooling. Although the coated layer has a half thickness compared to the conventional PCM steels having 23tn thickness, it exhibits excellent quality for the usage of rear cover panel. The new steel sheet was applied to test products to get quality certification from worldwide electronic appliance customers. Detailed discussion provides in this paper including preparation of composite solution, roll coating technology, induction curing technology and quality evaluation from customers.

自動 電話機의 Push-Button式 Dial Pulse 送出機의 設計

田炳實,趙正萬,金種皎 전북대학교 공업기술연구소 1978 工學硏究 Vol.8 No.-

The existing automatic telephone causes many troubles in dialling because its structure is mechanical. In this paper, a design example of pushbutton type dial pulse transmitter of the automatic telephone which has no mechanical trouble, is presented and discussed. It reduces dialling time, normalizes dial pulse, decreases dial troubles, increases the life of telephone dial and automatic telephone exchange, and prevents us from wasting the fee for a telephone call.

고령 환자의 polypharmacy 현황 분석

조민경,전수정,이은숙,이병구,김광일,김철호 韓國病院藥師會 2005 병원약사회지 Vol.22 No.2

In general, individuals with advanced age are often associated with a number of chronic illnesses and, thus, polypharmacy becomes therapeutic necessity for these patients. In these cases, the inappropriate prescription, a problem associated with the polypharmacy, may lead to the complication in the pharmacotherapy, the increase in the unnecessary financial burden and the increase in the number of incidence of toxic/adverse reactions. The objectives of the study are to evaluate the status of polypharmacy in patients over 65 years of age in Seoul National University Bundang Hospital, and to formulate way(s) to alleviate the problem. Using the Electronic Medical Record (EMR) system of the hospital, various demographical and therapeutic variables (i.e., the gender, age, medical department, number of medicine, frequency of prescription for a given therapeutic class and frequency of inappropriate prescription) were complied during the 6 month period (viz, January 1st 2004~June 30th 2004) for patients over 65 years of age having 4 or more medicines per each treatment. In addition, the frequency of the duplication of therapeutics in prescriptions was determined in the departments of cardiology and neurology. The number of patients in the category was 4,378, accounting for 24.2% of patients over 65 years of age. The average age was 72.4 years (range of 65 to 96 years) while 57.6% (i.e., 2,521 patients) of the group was female patients. Based on the Beers Criteria, 0.94 % of the patient group was found to receive the medications always be avoided by elderly patients. For 3,399 patients who attended both departments, 13 patients were prescribed with the therapeutic duplication. Considering the fact the elderly patients are likely to be associated with the deterioration in the physiological and psychological functions, the outcome of the toxic/adverse reaction may become significantly amplified. Therefore, these observations indicate that an early warning system has to be implemented to alleviate the incidence of inappropriate prescription such as therapeutic duplication, overdose and/or potential drug-drug interaction.

TFT LCD 컨트롤러 비디오 변환보드 구현

조해성,김남희,전병실 전북대학교 공업기술연구소 2000 工學硏究 Vol.31 No.-

In this paper, we develop TFT LCD video conversion board which receives input composite signals and display LCD panel to project input signals on large screen with graphic processing in industrial TFT LCD vision system. Implemented interface card has a capacity of XGA(1024X768). And we test the conformance of interface card to verify performance. Result shows good performance. Keywords : TFT LCD, video conversion board, interface card

안성천과 경안천 수중 과불화화합물의 잔류농도와 분광학적 특성

조천래 ( Chon Rae Cho ),이두희 ( Doo Hee Lee ),이병천 ( Byoung Cheun Lee ),김수진 ( Sue Jin Kim ),최경희 ( Kyung Hee Choi ),윤준헌 ( Jun Heon Yoon ) 한국환경분석학회 2010 환경분석과 독성보건 Vol.13 No.4

Concentrations of perfluorinated compounds (PFCs) in water samples from Anseong and Gyeongan stream were measured using an LC-MS/MS system. The average perfluorooctane sulfonate (PFOS), perfluorohexane sulfonate (PFHxS), perfluorooctanoic acid (PFOA) and perfluorononanoic acid (PFNA) concentrations of samples collected from Anseong stream were 43.4 ng/L, 15.0 ng/L, 14.5 ng/L and 3.5 ng/L, respectively. In the case of Gyeongan stream, the average concentration of PFOS, PFOA, PFHxS and PFNA were 15.5 ng/L, 8.3 ng/L, 5.4 ng/L and 1.5 ng/L, respectively. From the result, PFOS was found the dominant PFCs in these streams. The PFCs detected from the streams were correlated with DOC concentration, UV/vis factor and Fluorescence properties of water samples. In general, PFCs concentration had positive correlations with DOC concentration, A250/365 and A465 and synchronous Fluorescence indexes (Protein-Like Fluorescence, Fulvic-Like Fluorescence, Humic-Like Fluorescence). However, PFCs were negatively correlated with S(R). This result showed that concentration of PFCs could be significantly influenced by the aromaticity and molecular weight of organic compounds in water samples.

교양체육 참여자들의 몰입경험, 학교적응도, 대학생활만족 간의 구조적 관계

전태준(Chon, Tae-Jun),조남흥(Cho, Nam-Heung),안병욱(Ahn, Byoung-Wook) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.5

The purpose of this study was to investigate the structural relationship of flow experience, academic adjustment, and campus life satisfaction among general physical education class students. To achieve the objective of this study that 374 surveys have collected form general physical education class in Seoul, Gyeonggi, and Incheon areas. Frequency, explore factor, reliability, correlation analysis, and structural equation modeling were using SPSS 18.0 and AMOS 18.0. The main results were as follows: First, flow experience had influence on academic adjustment. Second, flow experience had influence on campus life satisfaction. Third, academic adjustment had not influence campus life satisfaction.

The Most Effective Number of Elastic Taping Applications on the Muscle Activity and Maximum Peak of the Wrist Extensor Muscle in Patients with Stroke

Ju Chul Cho,Byoung Kwon Lee,Seung Chul Chon 대한인간공학회 2014 大韓人間工學會誌 Vol.33 No.6

Objective: The aim of this study is to evaluate the differences in electromyographic activities of upper extremity muscle between repeated taping and to compare the effects of each taping method in stroke patients. Background: Taping studies for functional improvement and pain relief of the UE have been conducted using various methods. Despite being an important factor when you treatment to a patient in a clinical attachment numbers situation quantitative research is that there is not at all to the taping at the time of application. Method: Twenty patients volunteered in this study and were tested under four taping conditions as follows, in random order: (1) no taping, (2) taping applied once, (3) taping applied twice, and (4) taping applied thrice. The muscle activity and maximum peak of the extensor carpi radialis muscle in electromyographic activities were measured, respectively. Results: The muscle activity and maximum peak of the extensor carpi radialis muscle showed significant differences among the four conditions (p<.05). In the post hoc test, the extensor muscle showed significant differences in muscle activity and maximum peak in electromyographic activities, except between taping applied twice and thrice. Conclusion: These findings demonstrate that repeated taping up to two times may be useful in improving the muscle activity and maximum peak of the extensor muscle. Application: This study provides useful information to future researchers regarding the effects of repeated taping applications on muscle activity and maximum peak of the muscles of the human body.

車輛用 油類節減器의 實用化에 關한 硏究

姜錤文,田炳實,郭勳星,趙正萬 전북대학교 공업기술연구소 1978 工學硏究 Vol.8 No.-

Automotive fuel economizer problem is the matter of the world in energy crisis especially. The problem is more severe in our country because our country can not produce any raw petroleum. For saving petroleum and reducing automobile pollution, a fuel economizer of vehicle is an indispensable device. There are many active studies on fuel economizer of vihicle all of the world to solve the above serious problem. One of the dominant result of the studies is the development of capacitive discharge ignition(CDI)system. But the caracteristics of the CDI system have yet been getting more and more improved. In this study a CDI system is designed and tested for the practical use. 1) Area for field test For the measurement of the average rate of fuel reduction, the test car was run on the following: a) the express high way of Jeonju-Jeongeup-Kwangju-Shooncheon, Jeonju-Deajon-Cheonhju-Choongju. b) the high way of Jeonju-Goonsan. c) the pavement road of Jeonju-Namwon. 2) Testing system A car used for the measurement was the new type of Brisa('77 year type). Distance meter for the system was the attached meter to the Brisa. A stop watch made by Breiling Sprint of Swiss was used for the measurement of running hour. A fuel meter made bu Nissan Diesel Co. was used. 3) Measurement of the life of the CDI system. When an automobile electronic device is designed some kinds of special consideration are given to heat sinking, mechanical vibration and impact. All kinds of tests must be performed on thos viewpoints. The designed sustem had been tested for nine months. But any kinds of defects had not found. Following are summarized as the results for the CDI system of trial manufacture: 1) The rates of average saving fuel by using the CDI system are 60% under the speed of km/hr and 23% at the speed from 40 km/hr to 90 km/hr and 60% upper the speed of about 90 km/hr. 2) The car with the CDI system was accelerated more easily than the car without the system. 3) The life-time of spark plug and point contactor was extended by using the CDI system. 4) CO gas was exhausted from the car with the CDI system less than the car without the system.

전남 지역 5일장에서 신선 산채류의 유통 실태

조자용(Ja Yong Cho),양승렬(Seung Yul Yang),유성오(Sung Oh Yu),김병운(Byoung Woon Kim),장홍기(Hong Gi Jang),천상욱(Sang Uk Chon),박윤점(Yun Jum Park),허북구(Buk Gu Heo) 한국원예학회 2005 원예과학기술지 Vol.23 No.4

유망 산채자원의 개발과 산업화, 산채류 문화보존을 위한 기초자료 확보 측면에서 2005년 3월부터 5월까지 전남 지역 1개시와 10개 군의 5일장에 출하된 신선 산채류의 유통실태를 조사하였다. 신선 산채류의 유통경로는 채취 및 생산자들이 소비자들에게 직접 판매하는 비율이 92~96%를 차지하였다. 5일장에서 신선 산채류를 판매하는 곳은 24개소에서 180개소까지 다양하였다. 신선 산채류의 출하 품목은 총 41 종류였다. 5일장에 따라 출하된 품목 수는 14~22종이었다. 참취, 쑥, 돌미나리, 두릅나무, 돌나물, 머위, 도라지, 쑥부쟁이, 냉이, 달래 등은 지역에 따라 다소간의 차이는 있었지만 전 지역에서 출하량이 많았다. 그러나 배초향은 순천에서 16.6%, 엉겅퀴는 장흥에서 29.4%, 분홍개미자리는 영암에서 27.9%로 특정 지역에서만 출하량이 많았다. 산채류 판매자들의 연령은 51세 이상이 78% 이상을 차지하였으며, 61세 이상의 고령자는 완도군(91.6%), 보성군(87.4%), 함평군(85.7%), 화순군(83%), 무안군(81.5%) 등에서 비율이 높았다. 신선 산채류의 판매처당 판매품목 수는 82%이상이 4종류 이하를 판매하고 있었다. We have also examined the actual state of distribution of fresh wild vegetables at the five-day traditional markets from March to May, 2005, in order to develop and industrialize favorable wild vegetable resources, and to collect basic data for the cultural preservation of them. About 92~96% of fresh wild vegetables were sold directly to the end customers by the producers or gathers. Fresh wild vegetables were on sale from 24 stores in some five-day traditional markets and 180 stores in others. Forty one kinds of fresh wild vegetables were in the traditional markets. But the number of fresh wild vegetables varied from 14 to 22 according to the five-day traditional markets. Such fresh wild vegetables as Aster scaber, Artemisia princes, Oenanthe javanica, Aralia elata, Sedum sarmentosum, Petasites aponicus, Platycodon grandiflorum, Kalimeris yomena, Capsella bursa-pastoris, and Allium onanthum were sold in large quantities even though there was a little difference according to the regions. Some fresh wild vegetables were sold in a large amount at a specific traditional markets: 16.6% of Agastach rugosa were on the Suncheon markets, 29.4% of Cirsium japonicum on the Jangheung markets, and 27.9% of Spergularia rubra on the Yeongam markets. Around 78% of the marketers were above 51 years old. Marketers over the age of 61 were 91.6% at Wando-gun, 87.4% at Boseong-gun, 85.7% at Hampyeng-gun, 83.0% at Hwasun-gun, and 81.5% at Muan-gun. Over 82% of the stores at the traditional markets sold fewer than four kinds of fresh wild vegetables.