• Computers and Concrete
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• v.24 no.5
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• pp.437-444
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• 2019

PLC and its expansion module, electric ball valve and cooling pipe, electric heating steel plate and various components of the system, which is used to control test and process data. By automatically adjusting the opening of the valve, the system makes the top temperature and cooling speed develop along the ideal temperature diachronic curve. Moreover, the system enables the temperature difference between inside and surface of test block limited in a given range by automatically controlling the surface board heating. The method of physical simulation test by sandbox with built-in cooling water pipe and heating rod is adopted. On the premise of a given standard value, the operation of the system is checked under different working conditions. Further, an extension of this system is proposed, which enables its application to obtain some thermal parameters when cooperating with numerical simulation.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.33 no.2
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• pp.337-344
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• 2023

Modern OSs, including Linux, show high scalability by adopting a monolithic kernel design, but have weak security because they share all memory space. This study presents a kernel module that are isolated inside the kernel using WebAssembly. WebAssembly provides a high-performance virtual machine by defining a low-level instruction set while guaranteeing memory safety. In this paper, the WebAssembly execution environment is implemented inside the kernel, allowing developers to control the operation of kernel modules and achieving higher security.

• Proceedings of the Korean Society of Computer Information Conference
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• 2020.01a
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• pp.223-224
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• 2020

본 논문은 개발 논문으로써 유니티 엔진을 이용하여 1인칭으로 진행하는 샌드박스 게임으로 악조건 속에서 생존하며 안전한 거점을 확보하는 것이 게임 개발의 목표이다. 제안 게임은 플레이어가 아무 것도 없는 상황에서 자유롭게 행동을 할 수 있는 조건을 가지도록 하며, 이를 통해 다양한 종류의 경험과 게임 포인트에 대한 전략을 통해 플레이어들에게 게임에서 큰 흥미와 성취감을 갖도록 하는 장점으로 가지고 있다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2023.07a
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• pp.625-627
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• 2023

본 논문은 모바일 운영체제의 보안 매커니즘을 조사하고, 현재까지 알려진 공격 경로뿐만 아니라 새로운 공격 경로를 탐지하기 위한 방법에 대해 연구하였다. 모바일 운영체제 보안은 사용자의 개인 정보와 중요한 데이터를 보호하는 데 매우 중요하며, 이에 대한 이해와 공격 경로의 탐지는 보안 강화에 필수적이다. 본 연구에서는 iOS와 Android를 중심으로 모바일 운영체제의 주요 보안 매커니즘을 분석하고, 샌드박스 환경, 권한 관리, 암호화 등의 보안 매커니즘에 대해 상세히 살펴보았다. 또한, 이전 연구들에서 파악된 공격 경로 외에도 새로운 공격 경로를 발견하고 탐지하기 위한 방법과 도구를 개발하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.17 no.12
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• pp.3345-3363
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• 2023

Developers often use cross-platform frameworks to create mobile apps that can run on multiple platforms with minimal code changes. However, these frameworks may not suit all the needs of a specific app, so developers may also use native APIs to add platform-specific features. This method eventually dilutes the advantages of cross-platform development methodology that aims to reduce development costs and time, and often leads to a decision to return back to the original native mobile development methodology. In this study, we explore a different approach: combining different cross-platform tools to develop a storybook mobile app that meets various requirements. We have demonstrated that integrating two cross-platform solutions can be used reliably to develop complex mobile applications. However, we also report that this approach can introduce unforeseen issues such as sandbox redundancy, unexpected functional burdens, and redundant permission requests. Despite these challenges, we believe that combining two cross-platform solutions can be applied to a variety of functional and performance requirements, enabling the development of more sophisticated mobile applications at lower costs and with shorter development timelines than traditional mobile app development methodologies.

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 2002.11a
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• pp.131-186
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• 2002

우리나라 유통상토에 대한 물리적 표준분석법을 설정하기 위한 연구를 실시하였다. 국내 시중에 유통되고 있는 53개 품목의 원예용 상토와 9개 품목의 수도용 상토를 대상으로 설정된 분석법을 적용하여 실험하였다. 입자밀도의 측정은 가스형 피크노메타(Micromeritics Co. Model 1305)를 사용하면 속도와 정확성 면에서 매우 유리하였다. 용적밀도는 구미에서 Sandbox법에 의한 용적밀도를 기본으로 하기 때문에 이와 유사한 성적을 얻을 수 있는 다양한 실험을 한 결과, 추다짐법(Plunger compaction method)이 가장 유의성 있는 측정 방법으로 밝혀졌다. 한편 가스형 피크노메타법에 의한 우리나라 유통상토의 입자밀도는 원예용이 1.93, 수도용이 2.43 Mg m$^{-3}$로 나타났으며, 추다짐법에 의한 용적밀도는 원예용이 0.22, 수도용이 1.01 Mg m$^{-3}$로 각각 나타났다. 수분함량은 105$^{\circ}C$ 건조기에서 16시간 건조하여 수도용상토는 (최초 무게-건조 후 무게) / (건조 후 무게) $\times$ 100으로, 원예용상토는 (최초무게 - 건조 후 무게) / (최초 무게) $\times$ 100으로 하였다. 보수력은 주로 저압용으로서 Eijkelkamp사의 Sandbox법을 사용하여 0.5, 1, 3, 5, 7, 10 ㎪의 수분장력 상태의 수분함량을 조사하였다. 포화수리전도도는 직경 5cm$\times$높이 20cm인 아크릴 원통을 이용하여 정수위별에 의한 포화수리전도도를 측정하였다. 신분석법에 의한 유통상토의 수분함량은 원예용이 평균 46.34%, 수도용이 평균 16.89%이었고 원예용 상토의 EAW는 28.4%, WBC 7.01%, OMP는 5.60 ㎪로 나타났으며, 육묘를 위한 적정 수분함량은 44.41%이었고 포화수리전도도는 1.71 cm $min^{-1}$이었다. 상토 평량시 무게를 비교한 결과 상토 부피를 달리하여도 고도의 유의성이 있었고, 상토 20cc의 평균무게는 4.92g(2.08-8.83g)이었다. 상토의 EC 측정시 상토:물의 비율이 1:2(v:v)와 1:5(v:v)분석치에 2.5배한 EC 값과는 고도의 정의 상관관계가 있었으며, 유럽법과 일본법(전농)과의 관계는 고도의 정의 상관관계가 있었다 또한 새로운 분석법(v:v 1:5)으로 측정한 EC의 평균값은 국내산 0.64, 수입산 0.33 dS m$^{-1}$이 었다. 상토의 pH 측정시 상토:물의 비율을 1:2(v:v)와 1:5(v:v)와의 관계에서는 정의 상관관계를 보였으며, 유럽법과 일본법(전농)과의 관계도 역시 고도의 정의 상관관계가 있었고, 신 분석법에(v:v 1:5) 의한 분포비율은 국내산, 수입산모두 pH 6.1-6.5의 범위에서 가장 높았다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.20 no.4
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• pp.7-16
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• 2020

The mobile electronic notification service delivers notifications through mobile phone text or app-based message push to solve various problems of the paper-based mail service. And it is a service that an electronic document relay company proves to prove delivery. In order for public and administrative agencies to provide mobile electronic notification service, the user's identification information of the mobile phone number or the subscribed app is required. To overcome these limitations, ICT-regulated sandbox system was used to allow collective conversion of users' resident registration numbers into connecting information (CI). Therefore, in this paper, we propose a technical method for safe management of user CI in mobile electronic notice service, identity verification of electronic notice readers, and prevention of forgery and forgery of electronic notices. Through the proposed method, it is confirmed that the service can be activated by minimizing the adverse function of the mobile electronic notification service by securing the user's convenience and technical safety for the CI.

• Korean Journal of Soil Science and Fertilizer
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• v.35 no.6
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• pp.335-343
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• 2002

Methods of bedsoil analysis were difficult to be applied universally because use and material of bedsoil are diverse from country to country. Korean Standard Methods for Bedsoil Analysis was developed to measure the water content, water retention, and saturated hydraulic conductivity. Fifty-three samples for horticultural bedsoil and nine samples for paddy rice bedsoil in the current market were collected. Water content of bedsoil was determined using gravimetric method through $105^{\circ}C$ oven-dry for 16 hours, but different calculations between horticultural and paddy rice bedsoils were chosen according to different predominant component, plant residue or mineral. Water content percentage of horticultural bedsoil was calculated as [(weight of sample before oven-dry - weight of sample after oven-dry)/(weight of sample before oven-dry)]${\times}100$, while that of paddy rice bedsoil as [(weight of sample before oven-dry - weight of sample after oven-dry)/(weight of sample after oven-dry)]${\times}100$. Water retention was measured at water potential -0.5, -1, -3, -5, -7, -10 kPa by Sandbox method and saturated hydraulic conductivity was measured by constant head method using acryl cylinder (${\Phi}5cm{\times}L\;20cm$). By new 'Korean Standard Methods of Bedsoil Analysis', the average water content of horticultural bedsoil was obtained 46.34%(w/w) and that of paddy rice bedsoil 16.89%. For horticultural bedsoil, easily available water(EAW), water buffering capacity(WBC), and optimal matric potential(OMP) was estimated at 28.4%, 7.01%, and -5.60 kPa, respectively. Optimal moisture content was 44.41% and average saturated hydraulic conductivity for bedsoils was estimated at $28.4cm\;min^{-1}$.

• Journal of the Korean Society for Computer Game
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• v.31 no.4
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• pp.17-28
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• 2018

In recent years, Sandbox Games have become more and more popular in players, and The Elder Scrolls 5 Skyrim is the magnum opus of this type of game. However, the element of this game's attraction for players, which is why the game is fun to play is worth exploring in the territory of Game Design. In this paper, I will introduce the game The Elder Scrolls 5 Skyrim in detail, listing some of the game's storyline 、 Game Mechanics and analyze them. Researching the advantage and disadvantage viewed from the angle of Game Interactive Design. Finally by analyzing a large number of interactive storytelling cases in the game and the game experience brought to players, I get some universal principles in the game interactive storytelling design level. The research transforms the players' subjective intuition factor into a clear interactive storytelling design pattern, which aims to provide qualitative design criteria and framework for game interactive storytelling design. Then find a universal technique of Game Interactive Design, that is how to design a game interaction system for a sandbox game that will make the game attractive to players. And this may provide some guiding significance for the later Game Interactive Designing.

• Journal of Internet Computing and Services
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• v.17 no.1
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• pp.91-99
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• 2016

A security system in Android OS adopts sandbox and an permission model. In particular, the permission model operates the confirmation of installation time and all-or-nothing policy. Accordingly, the Android OS requires a user agreement for permission when installing an application, however there is very low level of user awareness for the permission. In this paper, the current status of permission requirement within mobile apps will be discovered, and the key inspection list with an appropriate method, when a mobile service provider autonomously inspects the violation of least privilege around financial companies, and its usefulness will be explored.