• Proceedings of the Korean Information Science Society Conference
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• 2002.10c
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• pp.583-585
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• 2002

자바카드의 큰 특징 중의 하나는 바로 필요한 응용프로그램이나 Library를 카드가 발급된 후에도 카드 상에 업로드 시켜 이용할 수 있다는 것이다. 하지만 카드를 발급할 때 Mask형태로 ROM상에 올려져 있는 API의 경우 수정하는 것이 불가능하며 또한 단순히 새로운 API를 추가한다 하더라도 기존에 이를 사용하던 애플릿의 변경이 불가피 하게 된다. 본 논문에서는 발급 후 API를 추가하는 예를 보이고 이런 문제점을 개선한 모델을 제시하여 보다 유연한 API 개발 환경을 제공하게 한다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.27 no.1
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• pp.91-101
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• 2017

API call sequence analysis is a kind of analysis using API call information extracted in target program. Compared to other techniques, this is advantageous as it can characterize the behavior of the target. However, existing API call sequence analysis has an issue of identifying same characteristics to different function during the analysis. To resolve the identification issue and improve performance of analysis, this study includes the method of API abstraction technique in addition to existing analysis. From there on, similarity between target programs is computed and clustered into similar types by applying LSH to abstracted API call sequence from analyzed target. Thus, this study can attribute in improving the accuracy of the malware analysis based on discovered information on the types of malware identified.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04d
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• pp.322-324
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• 2003

정보가전기기에 네트워크 기능을 탑재하게 되면 인터넷을 통해 사이버교육, 재택업무 등을 쉽고 편리하게 하여 삶의 질을 향상시키는데 기여할 수 있다. 이러한 정보가전기기에 네트워크 기능을 제공하기 위해 자바가상머신에서는 NET API를 제공한다. NET API를 구현하는데 있어 시스템에 의존적인 부분들이 존재하게 되는데, 이는 native 함수에서 구현한다 본 논문에서는 리눅스 기반 자바 NET API론 구현하는데 있어 플랫폼 독립적인 자바 부분과 의존적인 native 부분으로 나누어 설계 및 구현하였고, 소켓을 통한 서버/클라이언트간의 데이터 전송 부분에 초점을 두었다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2023.01a
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• pp.257-260
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• 2023

본 논문에서는 Vue.js와 Spring Boot 프레임워크를 사용하여 사용자 편의성을 제공하기 위해 Gird System, Data Table, Chart 등의 기능을 활용하여 축구 데이터를 표현한 웹 응용서비스를 개발하였다. Rapid API의 Open REST API 중 하나인 API-FOOTBALL에 액세스하여 국내에서 쉽게 찾아보기 어려운 세계 축구 리그의 순위표, 일정, 팀 및 선수의 세부 정보 데이터를 활용하였다.

• Journal of Internet Computing and Services
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• v.25 no.1
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• pp.1-8
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• 2024

In the API gateway, API composition is an essential function that can reduce the number of client calls and prevent over-fetching and under-fetching. API composition that operate with IMJ (In-Memory Join) consume a lot of resources, putting a burden on the performance of the API gateway. In this paper, to improve the problem of IMJ-style API composition, we propose SAPIC (Stream-based API Composition), which delivers the data to be composed to the client by streaming. SAPIC calls each MSA API that makes up the client response data and immediately streams the received response data to the client, reducing the resource consumption of the API gateway and providing faster response time compared to IMJ. As a result of a comparison experiment with GraphQL, a representative API combination technology, SAPIC recorded a maximum CPU occupancy rate of approximately 21 to 70 % lower, a maximum heap usage rate of approximately 16 to 74 % lower, and a throughput rate that was 1 to 2.3 times higher than GraphQL.

• Proceedings of the Korean Society of Computer Information Conference
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• 2023.07a
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• pp.187-188
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• 2023

본 논문에서는 안드로이드 플랫폼 기반의 스마트폰에 내장된 GPS 센서와 카카오 로그인 API, 기상청 API, 유튜브 라이브러리, 크롤링을 활용한 체감 온도 기반 코디 추천 애플리케이션을 설계하고 구현한다. 카카오 로그인 API를 활용한 제삼자 로그인 인증 방식을 사용하고 사용자별 체질 정보를 입력받아 개인화된 옷차림 정보를 제공하도록 구현한다. 또한 GPS 센서로 받아온 위치 정보를 기상청 API와 연동하여 사용자의 현재 위치에 해당하는 날씨 정보와 체감 온도를 계산하여 제공하도록 구현한다. 그리고 유튜브 라이브러리를 사용하여 유튜브 코디 영상을 제공하여 사용자의 코디에 도움을 주도록 구현한다.

• Journal of Internet Computing and Services
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• v.24 no.1
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• pp.9-15
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• 2023

Single-Page Application(SPA) requires data transformation for communication with RESTful API. The Backend for Frontend(BFF) pattern handles this transformation in the server, but there is some problem that increases the number of communication and makes development and distribution difficult. In this study, we propose an architecture that maps the ViewModel of SPA and the model of RESTful API directly in SPA. The proposed architecture automatically generates a mapping model between the RESTful API model and the ViewModel using the OpenAPI specification, which is the document model of the RESTful API. The data transfer component of SPA automatically converts RESTful API data and ViewModel using the created model. As a result of comparison with the existing BFF method through case study, the proposed architecture showed higher development productivity than BFF, and as a result of load tests, it recorded about 6% lower server CPU occupancy compared to BFF.

• Journal of IKEEE
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• v.19 no.2
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• pp.186-192
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• 2015

This paper proposes an automatic generation technology of test case based on API in source code for software's quality improvement. The proposed technology is comprised of four processes which are analyzing source code by using the Doxygen open source tool, defining API specification by using analyzed results, creating test design, generating a test case by adapting Pairwise test technology. Analyzing source code by using the Doxygen open source tool is the phase in which API information in source code such as the API name, input parameter and return parameter are extracted. Defined API specification by using analyzed results is the phase where API informations, which is needed to generate test case, are defined as a form of database by SQLite database on the basis of extracted API information. Creating test design is the phase in which the scenario is designed in order to be composed as database by defining threshold of input and return parameters and setting limitations based on the defined API. Generating a test case by adapting Pairwise test technique is the phase where real test cases are created and changed into database by adapting Pairwise technique on the base of test design information. To evaluate the efficiency of proposed technology, the research was conducted by begin compared to specification based test case creation. The result shows wider test coverage which means the more cases were created in the similar duration of time. The reduction of manpower and time for developing products is expected by changing the process of quality improving in software developing from man-powered handwork system into automatic test case generation based on API of source code.

• KIISE Transactions on Computing Practices
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• v.21 no.3
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• pp.263-268
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• 2015

Malware variations could be defined as malicious executable files that have similar functions but different structures. In order to classify the variations, this paper analyzed sequence alignment, the method used in Bioinformatics. This method found common parts of the Malwares' API call information. This method's performance is dependent on the API call information's length; if the length is too long, the performance should be very poor. Therefore we removed the repeated patterns in API call information in order to improve the performance of sequence alignment analysis, before the method was applied. Finally the similarity between malware was analyzed using sequence alignment. The experimental results with the real malware samples were presented.

• Review of KIISC
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• v.12 no.4
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• pp.94-103
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• 2002

본 고에서는 암호라이브러리 제품들에 기술을 제공하는 암호API의 국외 표준화 현황을 알아보고 이들 국외 API들을 비교·분석한다. 그리고 국내·외 암호라이브러리제품들을 지원 알고리즘, OS, API, 속도 등으로 비교·조사한 뒤, 안전성 면에서 많은 지적을 받고 있는 난수생성기를 기준으로 암호라이브러리 제품들을 분석한다. 또한 효율성 측면에서는 공개키 암호의 속도를 위주로 암호라이브러리 제품들의 성능을 비교·정리한다.