Preparations and Characterizations of Nanoporous TiO₂ Films by Sol-Gel Method

장성일,여윤선,정보화,장영욱,노치우,이진국,김미라 한국공업화학회 2007 한국공업화학회 연구논문 초록집 Vol.2007 No.-

탈중앙화된 계약 서비스를 위한 PDS 기반 계약관리 방안 연구

장성일,조용준,신동명 한국소프트웨어감정평가학회 2024 한국소프트웨어감정평가학회 논문지 Vol.20 No.4

본 연구는 탈중앙화된 개인 데이터 저장소(PDS)를 활용하여 계약관리 시스템의 보안성과 투명성을 강화하는 방안을 제안한다. 탈중앙화 데이터 관리 방식은 기존 중앙화된 계약관리 시스템에서 발생하는 데이터 보안, 단일 장애점, 데이터 주권 문제를 해결하는 데 유리한 대안으로 주목받고 있다. 본 연구에서는 Solid Project를 기반으로 PDS를 사용하여 계약 데이터를 저장하고 관리하며, 사용자에게 데이터 소유권과 통제권을 부여하는 계약관리 구조를 설계하였다. Solid Project의 Web Access Control(WAC)을 통한 접근 제어 메커니즘을 중심으로 사용자가 계약 데이터의 접근을 제어할 수 있는 방법을 제시하고, 블록체인 기술을 연계하여 계약 이행의 무결성과 투명성을 보장한다. 본 연구는 탈중앙화된 계약관리 시스템이 사용자 중심의 데이터 소유권을 강화하고, 계약 과정에서의 프라이버시와 보안을 한층 높이는 데 기여할 수 있음을 보여준다. We propose a method to enhance the security and transparency of contract management systems using a decentralized Personal Data Store (PDS). Decentralized data management is gaining attention as an effective alternative to address issues related to data security, single points of failure, and data sovereignty in traditional centralized contract management systems. We utilize Solid Project-based PDS to store and manage contract data, granting users ownership and control over their data through a designed contract management structure. We focus on providing a mechanism for users to control access to contract data through Solid Project's Web Access Control (WAC) and ensure the integrity and transparency of contract execution by incorporating blockchain technology. We demonstrate that a decentralized contract management system can enhance user-centered data ownership and improve privacy and security throughout the contract process.

해양안보 개념 연구: 해상수송로 안보 논의를 중심으로

장성일 21세기정치학회 2022 21세기 정치학회보 Vol.32 No.4

This paper aims to conceptualize maritime security by focusing on sea lane security. The strategic and economic significance of sea lane security has vastly increased since the Second World War. Moreover, as international trade grows, the importance of major choke points, such as the Strait of Hormuz, and Malacca, also increases. Sea lane issues can be a national security matter when a state considers a military response to tackle any sea lane security threats. The U.S.-Iran conflict over the Strait of Hormuz in 2019 was a prime example that sea lane security could be national security involving military conflict. However, sea lane security has not received adequate scholarly attention. In that context, this paper attempts to conceptualize sea lane security employing Buzan(1991)'s and Baldwin(1997)’s security studies.

Efficacy of a Multiplex Paclitaxel Emission Stent Using a Pluronic® Mixture Membrane versus a Covered Metal Stent in Malignant Biliary Obstruction: A Prospective Randomized Comparative Study

장성일,이세준,정석,이돈행,김명환,윤홍진,이동기 거트앤리버 소화기연관학회협의회 2017 Gut and Liver Vol.11 No.4

Background/Aims: A drug-eluting stent for unresectable malignant biliary obstruction was developed to increase stent patency by preventing tumor ingrowth. The safety and efficacy of a new generation of metallic stents covered with a paclitaxel-incorporated membrane using a Pluronic® mixture (MSCPM-II) were compared prospectively with those of covered metal stents (CMSs) in patients with malignant biliary obstructions. Methods: This study was initially designed as a prospective randomized trial but was closed early because of a high incidence of early occlusion. Therefore, the data were analyzed using the intent-to-treat method. A total of 72 patients with unresectable distal malignant biliary obstructions were prospectively enrolled. Results: The two groups did not differ significantly in basic characteristics and mean followup period (MSCPM-II 194 days vs CMS 277 days, p=0.063). Stent occlusion occurred in 14 patients (35%) who received MSCPM-II and in seven patients (21.9%) who received CMSs. Stent patency and survival time did not significantly differ between the two groups (p=0.355 and p=0.570). The complications were mild and resolved by conservative management in both groups. Conclusions: There were no significant differences in stent patency or patient survival in MSCPM-II and CMS patients with malignant biliary obstructions.

Anastomotic stricture after liver transplantation: It is not Achilles’ heel anymore!

장성일,이동기 소화기인터벤션의학회 2018 International journal of gastrointestinal interven Vol.7 No.2

Biliary-tract complications, such as biliary strictures, anastomotic leaks, choledocholithiasis, and biliary casts, can occur after liver transplantation (LT). Of these complications, biliary strictures are regarded as an Achilles’ heel. Recently, treatment of anastomotic biliary stricture (ABS) has transitioned from conventional surgical revision to a nonsurgical treatment modality. Endoscopic serial balloon dilatation and/or multiple plastic stent replacements are highly effective and are now regarded as the first-line treatments. However, if the patient has undergone anastomosis by means of a hepaticojejunostomy, percutaneous treatment is performed. With recent technological advances and the rendezvous method, the clinical success rates of endoscopic and percutaneous ABS treatments have increased, but these methods fail in some patients who have total obstruction of anastomotic stricture. For these patients, magnetic compression anastomosis (MCA) has been suggested as an alternative method. Animal and human studies have demonstrated the safety and efficacy of MCA, and advancements in these nonsurgical methods have increased the clinical success rate of ABS. This review focuses on ABSs that develop after LT and discusses the clinical results of various nonsurgical methods and future directions.

Contrast-enhanced endoscopic ultrasonography: advance and current status

장성일,이동기 대한초음파의학회 2014 ULTRASONOGRAPHY Vol.33 No.3

Endoscopic ultrasonography (EUS) technology has undergone a great deal of progress along withthe color and power Doppler imaging, three-dimensional imaging, electronic scanning, tissueharmonic imaging, and elastography, and one of the most important developments is the abilityto acquire contrast-enhanced images. The blood flow in small vessels and the parenchymalmicrovasculature of the target lesion can be observed non-invasively by contrast-enhancedEUS (CE-EUS). Through a hemodynamic analysis, CE-EUS permits the diagnosis of variousgastrointestinal diseases and differential diagnoses between benign and malignant tumors. Recently, mechanical innovations and the development of contrast agents have increased theuse of CE-EUS in the diagnostic field, as well as for the assessment of the efficacy of therapeuticagents. The advances in and the current status of CE-EUS are discussed in this review.

하이퍼레저 패브릭에서 보증 시간 감소를 위한 체인코드 실행 비용 기반 트랜잭션 스케줄링 방법에 관한 연구

장성일,김명호 한국IT정책경영학회 2020 한국IT정책경영학회 논문지 Vol.12 No.6

Blockchain technology is being actively discussed in areas such as distributed ID and decentralized web, and is steadily expanding. Among them, Hyperledger Fabric is a consortium blockchain technology designed to meet the needs of companies, unlike public blockchains such as Bitcoin and Ethereum. In this paper, we proposes a transaction scheduling method that improves the performance of applications by reducing the time it takes to endorsement during the transaction processing process of the hyperledger fabric. The proposed method measures the cost of transactions and the performance of the endors and applies them in scheduling. To measure the cost of transactions, we designs a framework for calculating transaction-specific costs of hyperledger fabric and proposes a process for calculating transaction-specific execution costs from chaincode.

인간경영

張聖萬(장성만) 한국지역사회연구소 2008 지역사회 Vol.58 No.-

대학생이 된 젊은이들에게

張聖萬(장성만) 한국지역사회연구소 2007 지역사회 Vol.55 No.-

오픈스택 기반 클라우드 컴퓨팅 시스템의 모니터링에 관한 연구

장성일,김명호 한국IT정책경영학회 2020 한국IT정책경영학회 논문지 Vol.12 No.2

클라우드 컴퓨팅 시스템은 지속적으로 성장하고 있는 분야이고 오픈스택은 클라우드 컴퓨팅 시스템 중 3번째로 시장 규모가 큰 IaaS를 제공할 수 있는 오픈소스 플랫폼 중 하나다. IaaS는 클라우드 서비스 소비자에게 가상머신을 제공하는 것이 핵심 목표기 때문에 클라우드 서비스 제공자는 컴퓨팅, 스토리지, 네트워크 등의 자원 풀의 상태를 모니터링할 수 있는 능력이 중요하다. 하지만 오픈스택의 기존 지표 수집 프로젝트인 ceilometer는 가상머신 중심적으로 지표를 수집하여 자원 풀의 상태를 모니터링하기에는 부족하다. 따라서 본 논문은 기존 모니터링 시스템을 분석하고 자원 풀을 모니터링하기 위해 지표 수집 에이전트를 추가한 모니터링 시스템 구조를 제안한다. 그리고 자원 풀의 상태를 한눈에 파악하기 쉽도록 수집한 지표를 표현하는 방식도 제안한다.