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郭喆孝 新羅大學校 1996 論文集 Vol.42 No.1
This study finds that the sales growth of firms has a negatively significant relations with a firm's leverage during the industry economic downturns in Korea. In general economic situations, firms have achieved the high value of firms with increasing the leverage. This may be the result that firms have been trying to have optimal capital structures in capital financing under the normal operating situation. But the findings that highly leveraged firms lose a lot of sales during the downturns tell us the possibility of financial distress. The relation between leverage and operating income would not be confirmed to be significant in the regression analysis. Also the relation between leverage and rate of stock return would not be confirmed to be significant. Therefore, this study couldn't tell that during the downturns firm's sales loss causes the cost of financial distress. At least in our country, these findings are inconsistent with the view that the indirect costs of financial distress are significant and positive.
현용휴,설인택,김영균,여환호,이철우 大韓顎顔面成形再建外科學會 1992 Maxillofacial Plastic Reconstructive Surgery Vol.14 No.4
Facial asymmetry can be most distressing for the young child and parents. It can cause functional problems as a result of malocclusion. Classification of facial asymmetry has not been yet well-organized because of its varieties on etiologic factors, involved sites and clinical expressions. Even though, we don’t know its causes definitely. It is generally believed that problems with aberrant pattern of condylar growth are related to facial asymmetry. This is a case report on surgical correction of the patients who had severe facial asymmetry. One patient was diagnosed as condylar hyperplasia and the other was diagnosed as a condylar hypoplasia related to trauma. We performed a simultaneous two-jaw surgery, condylar shaving, inferior border ostectomy of affected mandible in the former case, and a simultaneous two-jaw surgery, reverse-L osteotomy and alloplastic implantation with Biocoral in the latter case. The postoperative results of the two cases were excellent functionally and esthetically.
윤찬호,석경휴,나기창,배철수,나상동 조선대학교 전자정보통신연구소 2002 電子情報通信硏究所論文誌 Vol.5 No.1
Java applets are downloaded from web server through internet and executed in Java Virtual Machine of clients' browser. Before execution of java applets, JVM checks bytecode program with bytecode verifier and performs runtime tests with interpreter. However, these tests will not protect against undesirable runtime behavior of java applets, such as denial of service attack, email forging attack, URL spoofing attack, or annoying sound attack. In order to protect malicious applets, a technique used in this paper is java bytecode modification. This technique is used to restrict applet behavior or insert code appropriate to profiling or other monitoring efforts. Java byte modification is divided into two general forms, class-level modification involving subclassing non-final classes and method-level modification used when control over objects from final classes or interface. This paper showed that malicious applets are controlled by java bytecode modification using proxy server. This implementation does not require any changes in the web sever, JVM or web browser.
이순호,정철정,신성휴,강성철 한국운동역학회 1998 한국운동역학회지 Vol.8 No.2
In this study, an equation of angular momentum was induced with the determination of the inertia tensor of a lower leg segments 3-dimensional space by translating global and local reference systems. Following conclusions were come out of calculating the angular momentum of a segment in dwihoolro-chagi skill in Taekwondo. 1. The maxumum value of total angular monentum on a lower leg segments was presented in extension phase with a value of 1.49L, and it was similar to angular momentum changes on a thigh segment. Angular momentum of every factors on lower leg segments showed a continuing increse from initiation of a motion to the final hit. A negative peak was achieved at pre and post TO in LY of a shank. 2. The usefulness of the inducement of an equation of angular momentum by the translation of reference in this study was verified with an application of it to the calculation of angular momentum in dwihoolro-chagi skill in Taekwondo.
W-TCP 망에서 PRC 핸드오프 상태 머신의 성능 개선
석경휴 ( Kyung-hyu Suk ),송선희 ( Sun-hee Song ),김철영 ( Chul-young Kim ),김문환 ( Moon-hwan Kim ),윤찬호 ( Chan-ho Yoon ),배철수 ( Chul-soo Bae ),나상동 ( Sang-dong Ra ) 한국정보처리학회 2004 한국정보처리학회 학술대회논문집 Vol.11 No.1
W-TCP와 무선 이동 네트워크 환경에서 양질의 멀티미디어 서비스를 제공하기 위해서는 트래픽에 대한 QoS가 보장되도록 핸드오프 상태 머신에 대해 연구한다. 기존의 자원 예약 기법은 유선 네트워크를 위해 설계된 것이므로 무선 이동 네트워크에서의 QoS 보장 문제를 해결하지 못하고 빈번한 핸드오프로 인한 전송지연 문제와 MN의 위치 이동을 신속하게 제어 등 고속 페이징의 문제 들이 발생하고 있다. TCP와 셀룰라 IP 간의 상호 운용을 지원하는 기존 기법들은 적은 지역의 마이크로 셀 환경에서 그대로 사용될 경우 한계점을 가지고 있다. 본 논문에서는 무선 마이크로 셀룰러 네트워크에서 QoS를 보장하기 위해 셀룰라 IP을 기반한 W-TCP에 핸드오프 상태 머신을 추가한 W-TCP/PRC 핸드오프 상태 머신을 제안한다. 제안된 상태 머신에 대한 특성을 고찰한 결과 액세스 네트워크 내에서 고속 페이징이 가능하고 트래픽 부하가 개선됨을 보인다.
확산 스펙트럼 시스템에서 신경망 적응 수신기에 관한 연구
석경휴(Kyung-Hyu Suk),김광준(Gwang-Jun Kim),나상동(Sang-Dong Na),김희철(Hee-Chul Kim),배철수(Chul-Soo Bea) 한국정보과학회 1997 한국정보과학회 학술발표논문집 Vol.24 No.1A
확산스펙트럼 시스템에서 기존 수신기는 상대적인 간섭 신호 강도가 커짐에 따라 성능이 저하되므로 near-far 문제를 완화하는 최적 수신기로는 사용이 적절하지 못하다. 협대역 간섭과 부가적인 백색 가우시안 잡음이 부가된 적용 수신기에서 수신된 신호를 선형 · 비선형의 특징을 갖추고 있는 역전과 알고리즘을 이용하여 비선형 왜곡에 대해 대응성을 지니 새로운 노드 활성 함수로 구성된 복소수 역전과 알고리즘(CBPRLS)은 제안하고, 적응 횡단선 필터을 사용한 기존 수신기와 CBPRLS 알고리즘을 이용한 신경망 적응 수신기을 비교하였다. 제안된 CBPRLS 알고리즘을 사용한 NNAM 구조에서 비선형에 대한 신호 간섭을 효율적으로 억압하였으며, 신호대 간섭비에 대한 오차 면적이 기존 수신기보다 훨씬 적음을 입중한다.