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GDDR3 Memory Controller용 Impedance Calibration과 Level Shifter를 이용한 I/O Buffer 설계
김현창(Hyun-Chang Kim),황문상(Moon-Sang Hwang),김성우(Sung-Woo Kim),김태호(Tae Ho Kim),정덕균(Deog-Kyoon Jeong) 대한전자공학회 2010 대한전자공학회 학술대회 Vol.2010 No.6
An I/O buffer with impedance calibration feature for GDDR3 memory controller is presented in this paper. The proposed I/O buffer operates upto 1.2 Gb/s with 1.8-V supply voltage. The test chip was fabricated in standard 0.13-㎛CMOS process with 1.2-V supply voltage. A level-up shifter and a level-down shifter with little duty-cycle distortion are also introduced to implement 1.8-V I/O buffers in given process.
팬터그래프 방식의 전기버스 충전시스템을 위한 충전 인터페이스 및 통신 규약
김현일(Hyun-Il Kim),조현창(Hyun-Chang Cho),오국환(Koog-Hwan Oh) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
Due to the commercialization of electric buses in South Korea, charging methods for electric buses have been studied and implemented. Currently, plug-in charging methods are mainly dominated in South Korea. However, there are various 전기자동차 charging sockets for them and they are inconvenient due to the manual charging method. Recently, in North America and Europe, an automatic charging method, pantograph-type electric bus charging system, is being commercialized. It has the advantage that electric buses can automatically charge fast even when parking or stopping. This paper introduces charging interfaces and communication protocols of the pantograph charging system for electric buses.
가르시아 로르까(GARCIA LORCA)의 시(詩)와 희곡(戱曲)에 나타난 죽음
김현창 ( Hyun Chang Kim ) 서울대학교 인문학연구원 1988 人文論叢 Vol.20 No.-
This thesis treats essentially with death, expressed in the poetry and plays of Garcia Lorca. To understand his poetry, one must pay attention to the poetic theory of "duende" of which Lorca says he is possessed. The conception of "duende" of Garcia Lorca corresponds to a certain form of fatalism and indigenous belief of Andalucia. Garcia Lorca has also prepared a festival of cante jondo in collaboration with Manual de Falla. When Lorca speaks of "duende," it is very human, and differs from "Musa" or "angel.`` This means that "duende" is a presupposition of death as a human being. From his first volume of verse "Libro de poemas" on, he mentions and chants death, but the works in which he starts speaking intensively of death are: "Cante jondo" and "Romancero gitano." In "Cante jondo" he treats of death as if he admires it. "Romancero gitano" is about the tragic destiny of the gipsies. Here we can find words as: knife, dagger, battle, death and persecution, especially persecution of the gipsies by the guardia civil (police). In "Llanto por Ignacio Sanchez Mejias," we can not only read about the blood and the inevitable death of the toreros (bull-fighters), but also about the victory of death by their courage and valour, and the nobility of their attitude. In the three poems of which "Llanto por Ignacio Sanchez Mejias" consists, death is not an abominable thing, but it is charming, warm, and embraces the human being as an affectionate mother does with her children. In these poems we can easily appreciate the estetics of death as seen by Garcia Lorca. Here death is conquered and transformed in immortality by the valour of a real man. In the poems "Poeta en Nueva York," Lorca pays attention to the negros, just as he did with the gipsies of Spain in his previous poetry. This poetry is the culmination of Lorca``s esoterism. He chants the tragic destiny of the negros, their poverty, misery, disdain of the white people and death. In one of the poems of this volume of verse: "Jntroduccion a la muerte" (Introduction to Death), we can easily observe his obsession of death and death among the negros. Among several plays, three tragedies are representative: "Boda de sangre," "Yerma" and "La casa de Bernarda Alba." In each of the plays, the protagonists have a tragic death, In the Greek tragedies, death results of external factors, but in Lorca`s tra g edies internal factors are the reason of death. To conclude we can say that Garcia Lorca chants death from the beginning of his poetical creation on, till his last work, in an intensive way. Death as Lorca sees it is not a definite death, but it is a part of his life. In one thousand years of Spanish liter-□uture, we can rarely find a poet who mentions death as intensively as Garcia Lorca did.
우나무노(Miguel de Unamuno)의 철학(哲學)과 생(生)의 비극적(悲劇的) 감정(感情)
김현창 ( Hyun Chang Kim ) 서울대학교 인문학연구원 1989 人文論叢 Vol.22 No.-
Unamuno is at once a great author and a philosopher Spain produced at the beginning of the 20th century. Unamuno has a very original personality, knowing how to harmonize literature and philosophy. He is also a paradoxical and anti-rational writer, and the theme he treats repeatedly in his writings coincides with the essential philosophical subject. In this sense we can say he is a philosophical author. His works are, however, remarkable literary ones by their own quality. They are nevertheless no simple literarily decoration to the philosphical thinking. Unamuno is much too artistically and literary well-grounded to walk into that trap. When Unamuno writes, he tries to show us something more; for example he is haunted by the problem of human conscience after death. At the same time, his meditation centes on the man of flesh and bones, not on the abstract humanity. Reason is an enemy of life for Unamuno. For this he refuses to express his philosophy through reason. Arriving at the conclusion that reason can`t solve the problems of life and death, Unamuno chooses novel and drama, in other words, literature, as a means to express his philosophy. Inconvenience, life`s difficulties are the causes of anguish, and anguish appears when one can`t adapt oneself to the conditions of life. However it is through anguish we can arrive at truth and immortality. The tragical sentiment of life of Unamuno manifests itself when the author comes to realize that life and death depend on the Creator and not on himself. This doctrine has been made clear in "Niebla". This novel represents very well the philosophy of Unamuno`s tragical sentiment of life. According to Unamuno, religion presupposes the existence of man, not of God. The human desire to have the immortality of the soul makes man create religion. Unamuno refuses pure and unconditional faith. Eternal ignorance is not acceptable for Unamuno. You have to fight until death to conquer the mystery of life. This problem of faith is well expressed in "San Manuel bueno, martir." Unamuno has meditated much on death. His meditation is especially concentrated on the immortality of the soul. For Unamuno two means exist to conquer death: the first is immortality and the second resurrection. As far as his existentialism is concerned, he has been deeply influenced by Kierkegaard and Spinoza. Unamuno has realized his literature through philosophy and his philosophy through literature. Completing this monumental work he has shown us the new horizon literature and philosophy can have.
CCD카메라를 이용한 생물감시장치의 독성자료 신뢰성 향상에 관한 연구
김현창(Hyun Chang Kim),김영석(Young Suk Kim) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.10
우리나라 주요하천의 수질오염감시를 목적으로 물벼룩을 이용한 생물감시장치가 설치, 운용되고 있다. 기기 목적상 유해물질에 대해 신뢰성 있는 신속한 독성경보를 내릴 수 있어야 하고, 무인원격측정기기이므로 계절별, 연간 하천의 물리적인 변화에도 측정의 신뢰성이 확보되어야 한다. 국내에 운영중인 장비는 물벼룩의 단위시간당 뛰는 횟수(Impulse)를 측정하는 방법과 유영형태를 분석하여 독성지수(Toxicity)로 나타내는 방법이 있다. 두 장비가 동일한 조건에서 운전되었음에도 가동률과 긴급점검횟수가 다르게 나타났으며 원인은 용기 내 기포발생과 압력차이 등 여러 가지가 있다. 본 연구의 목적은 기포와 미시적인 압력의 영향을 감소시켜 측정의 불확실성을 줄이는 것이고, 나아가 생물감시장치가 어떤 환경에 설치되더라도 수질오염감시의 목적을 정상적으로 달성하는 데 기여하는 것이다. Water monitoring equipments using daphnia can be used to monitor the pollution levels of a country's main rivers. Such equipments should be capable of providing a prompt warning about increase in the contamination levels, which is evaluated on the basis of impulse number or toxicity index. As unmanned remote control equipments, they must provide reliable pollution monitoring results for each season and for the annual physical changes in each river. Two different equipments based on the impulse number and toxicity index showed different results for the operating rates and for the number of emergency checks required even though both were operated at the same conditions. The results are affected by many parameters such as the presence of any air bubbles and the microscopic pressure. The purpose of this study is to develop a method that can reduce the effect of bubbles or microscopic pressure on the monitoring data. We expect to achieve reliable monitoring data for water pollutants irrespective of the location of the equipment setup.
새로운 ERM-방법에 의한 미세구조 N-채널 MOSFET의 유효 캐리어 이동도와 소스 및 드레인 기생저항의 정확한 분리 추출
김현창,조수동,송상준,김대정,김동명,Kim, Hyun-Chang,Cho, Su-Dong,Song, Sang-Jun,Kim, Dea-Jeong,Kim, Dong-Myong 대한전자공학회 2000 電子工學會論文誌-SD (Semiconductor and devices) Vol.37 No.12
A new method, the external resistance method (ERM method), is proposed for accurate extraction of the gate bias-dependent effective channel carrier mobility (${\mu}_{eff}$) and separated parasitic source/drain resistances ($R_S$ and $R_D$) of n-channel MOSFET's. The proposed ERM method is applied to n-channel LDD MOSFETs with two different gate lengths ($W_m/L_m=30{\mu}m/0.6{\mu}m,\;30{\mu}m/1{\mu}m$) in the linear mode of current-voltage characteristics ($I_D-V_{GS},\;V_{DS}$). We also considered gate voltage dependence of separated $R_2$ and $R_D$ in the accurate modeling and extraction of effective channel carrier mobility. Good agreement of experimental data is observed in submicron n-channel LDD MOSFETs. Combining with capacitance-voltage characteristics, the ERM method is expected to be very useful for accurate and efficient extraction of ${\mu}_{eff},\;R_D,\;R_S$, and other characteristic parameters in both symmetric and asymmetric structure MOSFET's in which parasitic resistances are critical to the improvement of high speed performance and reliability. 미세구조 N-채널 MOSFET의 게이트-소스 전압에 의존하는 유효 채널 캐리어 이동도와 소스 및 드레인 기생저항의 정확한 분리 추출을 위해서 새로운 ERM-방법을 제안하였다. ERM-방법은 선형영역에서 동작하는 게이트 길이가 다른 두개의 소자($W_m/L_m=30{\mu}m/0.6{\mu}m, 30{\mu}m/1{mu}m$)에 적용되었고 유효 채널 캐리어 이동도를 모델링하고 추출하는 과정에서 게이트-소스 전압에 의존하는 소스 및 드레인 기생저항의 영향을 고려하였다. ERM-방법으로 추출된 특성변수들을 사용한 해석적 모델식과 소자의 측정데이터를 비교해본 결과 오차가 거의 없이 일치하는 것을 확인하였다. 따라서, ERM-방법을 사용하면 대칭구조 및 비대칭구조 소자의 유효 채널 캐리어 이동도, 소스 및 드레인 기생저항과 다른 특성변수들을 정확하고 효율적으로 추출할 수 있을 것으로 기대된다.