교육정보시스템이 교육성과에 미치는 영향에 관한 연구

김종환,박명종,Kim, Jong-Hwan,Park, Myung-Jong 한국산업정보학회 2010 한국산업정보학회논문지 Vol.15 No.5

For the education information system, evaluation of the performance have to incorporate the special characteristics od education. This paper is to develop some measures to assess the performance of Korean National Education Information System (NEIS). Performance measures are classified those into three detailed areas as the flow of value chain. which include end-users area, education process area and performance area. Research results show that the users's concern to the information system have an affirmative influence on the satisfaction of users, and attitude change of users have also a positive influence on the administration area of the information system such as task productivity, task innovation, satisfaction of the education users, activity of control process. Also, user's satisfaction for NEIS, that comes from the communication, have an affirmative influence on the better performance of education,

Porous Resorbable Calcium Carbonate와 Porous Replamireform Hydroxyapatite가 성견치주질환 이환 발치와내 이식된 치근과 발치와 치조골 재생에 미치는 영향

김종환,최성호,Kim, Chong-Kwan,Choi, Seong-Ho 대한치주과학회 1996 Journal of Periodontal & Implant Science Vol.26 No.2

Regeneration of the periodontal tissue destroyed by periodontal disease is one of the final goals of periodontal therapy. In the past few years, periodontists have used various alloplastic grafting materials in an attempt to regenerate bone lost from periodontal disease. These materials have used widely because they have shown to be nontoxic, biologically compatible with surrounding host tissue and chemically similar to bone. The purpose of this study was to investigate the effect of Porous Resorbable Calcium Carbonate and Porous Replamineform Hydroxyapatite on the regeneration of the alveolar bone and the healing of roots transplanted into the periodontally diseased extraction sockets of dogs. The experimental chronic periodontitis was induced by elastic ligatures on the 2nd and 3rd mandibular premolars of 2 adult dogs for 8weeks after surgically creating periodontal defect. The extracted root were split in half along the long-axis, and the extend of plaque exposure was marked on the root surfaces with burs. The roots were inserted in extraction sockets with Porous Resorbable Calcium Carbonate(PRCC) in left side and with Porous Replaminefrom Hydroxyapatite(PRH) in right side. The flaps were sutured to cover the sockets completely. The animals were sacrificed after 12 weeks of healing, and the specimens were examined histologically. The results were as follows: 1. No inflammatory reactions were observed in either groups. 2. Hoot resorption was observed in both groups while the general outline of the roots were maintained. 3. PRCC was almost completely resorbed and replaced with new bone, while R.H.A. was not resorbed & remained encased in newly-formed C-T and alveolar bone. 4. PRH was encapsulated with alveolar bone which has been deposited from apical & lateral area of the sockets, while the coronal portion of the sockets were filled with C-T. 5. In both groups, the resorbed portions of the roots were replaced with new bone. These results suggest that either PRCC or PRH may not interfere with bone formation or healing in extraction sockets, and in some degree, retard the root resorption. Because the roots maintained in anatomy, we think that graft materials prevent the root resorption.

메타데이터 레지스트리 기반의 분산 정보 통합 시스템 설계 및 구현

김종환,박혜숙,문창주,백두권,Kim, Jong-Hwan,Park, Hea-Sook,Moon, Chang-Joo,Baik, Doo-Kwon 한국정보처리학회 2003 정보처리학회논문지D Vol.10 No.2

중개기 기반 정보 통합 시스템은 서로 다른 지역 정보 시스템의 유연한 통합을 지원하나, 질의 처리시 최적화 측면과 지역 스키마 정보에 관한 메타데이터 표준화 측면에는 그리 큰 비중을 두지 않았다. 이러한 점을 개선하기 위해 제안된 분산 정보 통합 시스템은 질의 처리시 최적화 측면을 위해 질의 캐싱을 사용하며, 지역 스키마 정보에 관한 메타데이터 표준화 측면을 위해 ISO/IEC 11179 기반의 메타데이터 레지스트리를 사용한다. 이 시스템은 분산된 이기종의 비즈니스 정보 시스템들을 논리적으로 통합하여 사용자가 필요로 하는 통합된 정보를 웹 기반으로 제공한다. 이러한 시스템을 시스템 재사용성의 향상과 유지보수의 용이함을 위해 계층적 패턴을 사용하여 3계층 표현 방식 아키텍처로 표현하였고, 3계층 아키텍처의 핵심 요소들의 기능성과 흐름을 효과적으로 표현하기 위하여 UML 방법론을 확장한 EPEM 방법론을 이용하여 설계하였다. 또한 제안한 시스템의 구체적인 한 예로서, 공급망 관리 도메인에 적용하여 웹 기반으로 구현하였다. 따라서 분산 정보 통합 시스템은 질의 처리 속도 향상을 위해 질의 함수 관리기와 질의 함수 저장소를 통하여 질의 캐싱 기능을 제공하였고, 의미 이질성 해결을 위해 ISO/IEC 11179 기반의 메타데이터 레지스트리와 스키마 레파지토리를 이용함으로써 스키마 이질성과 데이터 이질성을 해결하였다. The mediator-based system integrates heterogeneous information systems with the flexible manner. But it does not give much attention on the query optimization issues, especially for the query reusing. The other thing is that it does not use standardized metadata for schema matching. To improve this two issues, we propose mediator-based Distributed Information Integration System (DIIS) which uses query caching regarding performance and uses ISO/IEC 11179 metadata registry in terms of standardization. The DIIS is designed to provide decision-making support, which logically integrates the distributed heterogeneous business information systems based on the Web environment. We designed the system in the aspect of three-layer expression formula architecture using the layered pattern to improve the system reusability and to facilitate the system maintenance. The functionality and flow of core components of three-layer architecture are expressed in terms of process line diagrams and assembly line diagrams of Eriksson Penker Extension Model (EPEM), a methodology of an extension of UML. For the implementation, Supply Chain Management (SCM) domain is used. And we used the Web-based environment for user interface. The DIIS supports functions of query caching and query reusability through Query Function Manager (QFM) and Query Function Repository (QFR) such that it enhances the query processing speed and query reusability by caching the frequently used queries and optimizing the query cost. The DIIS solves the diverse heterogeneity problems by mapping MetaData Registry (MDR) based on ISO/IEC 11179 and Schema Repository (SCR).

New Aggregation Algorithm for Tandem queue with Finite Buffers

김종환,Hur, Sung Kwan,徐承祿 大邱大學校附設 基礎科學硏究所 1991 基礎科學硏究 Vol.8 No.-

We consider a two-stage fmite tandem queueing system with Poisson arrivals and negative exponential service times. The customer who has completed his service at the first station has to go directlty to the second station. If the queue of the second station is full at the moment of the service completion of the customer at the first station, then the customer receives, another service at the first station. This is repeated until the customer completes a service at the first station at the moment that the second station is not fulL The problem of calculating the steady-state probabilities of this queueing system by the ordinary balance equations is time consuming. We develop an efficient algorithm to obtain the steady-state probabilities that utilize the two-way state aggregation techniques.

CdTe QDs 용액 안정성의 장시간 유지지속을 위한 TGA(thioglycolic acid)의 첨가효과

김종환,김태희,구동건,기경범,최원규,한경석,류봉기,Kim, Jong-Hwan,Kim, Tae-Hee,Gwoo, Dong-Gun,Kee, Kyung-Bum,Choi, Won-Gyu,Han, Kung-Seok,Ryu, Bong-Ki 한국재료학회 2012 한국재료학회지 Vol.22 No.9

This paper focuses on the after synthesis of CdTe quantum dots(QDs) in aqueous solution. CdTe nanoparticles were prepared in aqueous solution using mercaptocarboxylic acid or thioglycolic acid(TGA) as stabilizing agents. QDs emit light smaller than the nano size. The contents of the mercaptocarboxylic acid, and a kind of raw material, were revealed for a period of time. We succeeded in synthesizing a very high quality QDs solution; we discussed how to make QDs better and to keep them stabilized. TGA is known as one of the best stabilizing agents. Many papers have mentioned that TGA is a good stabilizing agent. We dramatically confirmed the state of QDs after the experiments. The QDs solution can be influenced by several factors. Different content of TGA can influence the stability of the CdTe solution. Most papers deal with the synthesis of CdTe, so we decided to discuss the after synthesis process for the stability of the CdTe solution.

생활폐기물소각장 안전관리 개선 사례

김종환,Kim, Jong-Hwan 대한산업안전협회 2007 안전기술 Vol.109 No.-

AIDP 환자(患者)의 한양방(韓洋方) 치료(治療) 1례(例)

김종환,박상욱,장자원,신우진,홍현우,김지윤,최인선,황원덕,Kim Jong-Hwan,Park Sang-Wook,Jang Ja-Won,Sin Woo-Jin,Hong Hyun-Woo,Kim Ji-Yun,Choi In-Sun,Hwang Won-Duek 대한한방내과학회 2003 大韓韓方內科學會誌 Vol.24 No.4

Introduction: Guillain-Barre syndrome(GBS) is defined as a recognizable clinical entity that is characterized by rapidly evolving symmetric limb weakness, a loss of tendon reflexes, absent or mild sensory signs, and variable autonomic dysfunctions. Recently there is an opinion that Acute Inflammatory Demyelinating Polyradiculoneuropathy'(AIDP) is more effective than 'GBS' for the symptoms. These symptoms are applicable to rheumatic arthritis(痺), flaccid paralysis of limb(?) caused by wind, cold and dampness(風, 寒, 濕) from an oriental medical view point. On this, we reported one case that diagnosed as 'complex of rheumatic arthritis(痺) and flaccid paralysis of limb(?)' at our oriental medical hospital. Result: we considered these symptoms as 'complex of rheumatic arthritis(痺), flaccid paralysis of limb(?)'. In accordance with the result, we treated the patient with Chung-Sang Tong-Jung On-Ha(淸上通中溫下). We concluded that external factors such as wind, cold and dampness(風, 寒, 濕) and internal factors like vital energy's disharmony(生氣不調和) affected the patient.

Direct Adaptive Control of Nonminimum Phase Systgems based on PID Structures

김종환,최계근,Kim, Jong-Hwan,Choi, Keh-Kun The Institute of Electronics and Information Engin 1986 전자공학회논문지 Vol.23 No.6

This paper presents direct adaptive controllers for single-input single-output nonminimum phase systems based on PID structures. Also, characteristics of these schemes are compared, and convergence properties are considered. In these schemes, controller parameters are estimated from the least-square algorithm and some additional auxiliary parameters are obtained from the proposed polynomial identity which is derived from the pole placement equation and the Bezout identity. The effectiveness of these schemes is demonstrated by computer simulation that has been carried out for a very difficult example.

새로운 백금 착체(II) 화합물의 흰쥐 혈장에서 대사체 확인

김종환,조요나,노영수,서성훈,정지창,장성구,이규홍,이주한,이경태,Kim, Jong-Whan,Jo, Yo-Na,Rho, Young-Soo,Seo, Seong-Hoon,Jung, Jee-Chang,Chang, Sung-Goo,Lee, Kyoe-Heung,Lee, Joo-Han,Lee, Kyung-Tae 한국약제학회 1998 Journal of Pharmaceutical Investigation Vol.28 No.3

KHPC-002 $[(trans-l-diaminocyclohexane-bis-l,2(diphenylphosphinoethane)platinum)\;{\cdot}2NO_3]$ and $KHPC-006[(cis-diaminocyclohexane-bis-1,2(diphenylphosphinoethane)platinum)\;{\cdot}2NO_3]$ were synthesized as candidates for third platinum antitumor agent. Before their pharmacokinetic study, we optimized the analytical condition with HPLC and identified the major metabolites in the rat plasma. HPLC analysis by $C_{18}$ reverse-phase column showed that standard peak of both compounds appeared rapidly at around 1 minutes, whereas metabolites of KHPC-002 and KHPC-006 which were extracted from plasma after single I.V. administration in rats or incubation for 24 hr at $37^{\circ}C$ showed retention time of $10{\sim}11$ minutes. These metabolites were identified as the major compound by Matrix Associated Laser Deposition/Ionization (MALDI), which only lose the 2 molecules of $NO_3$. Based on these results, we suggest that the major metabolites of KHPC-002 and KHPC-006 were [trans-l-diamino-cyclohexane-bis-l,2(diphenylphosphinoethane)platinum] and [cis-diaminocyclohexane-bis-l.2(diphenylphosphinoethane)platinum], respectively.

학술발표회 초록 ( 재료 (Ⅲ) ) : LPCVD 에 의한 탄소섬유 표면에 SiC 박막제조와 고온에서의 내산화 반응 연구

김종환,이영석,유승곤,이보성 ( J . H . Kim,Y . S . Lee,S . K . Ryu,B . S . Rhee ) 한국화학공학회 1994 춘계학술발표회 Vol.- No.-