NoSQL 데이터베이스를 사용한 도로 교통 데이터 질의 처리 시스템의 구현

Titus Irma Damaiyanti,Ardi Imawan,권준호,최윤호 한국정보과학회 2015 데이타베이스 연구 Vol.31 No.2

ITS (Intelligent transport system) offers a wide range of traffic information and services by integrating the IT-related high technology with transportation and facilities. By collecting road traffic data from various data sources such as road sensors and mobile phones, an ITS monitors the current road status of the urban area. However, when huge volumes of traffic data are collected, it is not efficient for a user to query road traffic data for finding similar traffic situation. To overcome this limitation, in this paper we propose a road traffic data query system which uses the MapReduce functionalities of NoSQL database. Raw road traffic data are converted into traffic matrices and stored into a MongoDB document database. Also, by computing a singluar value decomposition (SVD) from transformed traffic matrices and using the SVD, it is possible to query the road traffic data efficiently. We evaluate the efficiency of the proposed system by using the real road traffic data obtained from Busan metropolitan city. 지능형 교통 체계(ITS)는 교통 수단과 시설에 IT관련 첨단 기술을 접목하여 다양한 교통 정보 및 서비스를 제공한다. 도로 센서와 스마트 폰과 같은 다양한 데이터 소스로부터 도로 교통량 데이터를 수집하여, ITS는 도시 지역의 현재 교통 체계를 모니터한다. 하지만, 대용량의 교통 데이터가 수집될때, 사용자가 유사한 교통 상황을 찾기 위해서 교통 데이터를 대상으로 질의하는 것은 효율적이지 않다. 이를 극복하기 위하여 이 논문에서 NoSQL 데이터베이스의 MapReduce 기능을 이용하는 도로교통 데이터 질의 시스템을 제안한다. 제안된 시스템에서 원본 교통량 데이터는 행렬로 변환되어 MongoDB 문서 데이터베이스에 저장되고 이 행렬로부터 계산된 singular value decomposition (SVD)를 이용함으로써 효율적인 교통량 질의를 처리하는 것이 가능하다. 부산시로부터 제공받은 실제 데이터를 사용하여 제안하는 시스템의 효율성을 평가하였다.

The Many Sides of China`s World : China`S Reaction to The Color Revolutions: Adaptive Authoritarianism in full Swing

( Titus C. Chen ) 경남대학교 극동문제연구소 2010 ASIAN PERSPECTIVE Vol.34 No.2

Études de psychologie linguistique : Le Style oral rythmique et mnèmotechnique chez les Verbo-moteurs

Titus Jacquignon 부산대학교 한국민족문화연구소 2014 Localities Vol.4 No.-

Machine Learning and Statistical Approach to Predict and Analyze Wear Rates in Copper Surface Composites

Titus Thankachan,K. Soorya Prakash,V. Kavimani,S. R. Silambarasan 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.2

This research demonstrates the application of machine learning models and statistics methods in predicting and analyzingdry sliding wear rates on novel copper-based surface composites. Boron nitride particles of varying fractions was depositedexperimentally over the copper surface through friction stir processing. Experimental and statistical analysis proved thatthe presence of BN particles can reduce wear rate considerably. Analysis of worn-out surface revealed a mild adhesive wearduring low load condition and an abrasive mode of wear during higher load conditions. Artificial neural network based feedforward back propagation model with topology 4-7-1 was modeled and prediction profiles displayed good agreement withexperimental outcomes.

Connected edge detour monophonic number of a graph

P. Titus,P. Balakrishnan,A. P. Santhakumaran,K. Ganesamoorthy 장전수학회 2013 Proceedings of the Jangjeon mathematical society Vol.16 No.4

Connected edge detour monophonic number of a graph

Rheology assessment and barite sag in a typical North Sea oil-based drilling fluid at HPHT conditions

Ofei Titus Ntow,Ngouamba Elie,Opedal Nils,Lund Bjørnar,Saasen Arild 한국유변학회 2023 Korea-Australia rheology journal Vol.35 No.2

The occurrence of barite sag in drilling fluids has relatively often been the cause for gas kicks in oilwell drilling. The subsequent absorption of gas into drilling fluid could lower the density and reduce the viscosity of the drilling fluid, thereby aggravating both pressure control and hole cleaning. In this paper, we present experimental measurements of rheological properties and barite sag in a typical North Sea oil-based drilling fluid at downhole pressure and temperature conditions. A new experimental apparatus was setup for barite sag measurements at static condition with operational temperature and pressure capabilities up to 200 °C (392°F) and 1000 bar (14,503.8 psi), respectively. Rheometry measurements were conducted on fluid samples with and without barite particles at operating conditions up to 90 °C and 100 bar. We observed that at a typical shear rate of 250 s−1, which is experienced in 8.5″ hole annulus, the viscosity of fluid sample with barite increased nearly three times as that of the fluid sample without barite as the temperature and pressure increased. However, temperature effect on viscosity dominates at high shear rates compared to pressure effect. Furthermore, the fluid samples showed more shear-thinning effect with increasing yield stress as the temperature increased. On the other hand, barite sag measurements revealed that whereas fluid samples under high pressure are less prone to sag, high temperature fluid samples, however, promote sag significantly. The data from this study are useful to validate extrapolations used in computational models and to improve understanding and operational safety of sag phenomena at downhole conditions. We also discuss the importance of this study in optimizing drilling operations.

The forcing connected vertex monophonic number of a graph

P. Titus,K. IYAPPAN 장전수학회 2016 Advanced Studies in Contemporary Mathematics Vol.26 No.1

For any vertex x in a connected graph G of order p ≥ 2, a set Sx ⊆ V(G) is an x-monophonic set of G if each vertex v ∈ V(G) lies on an x - y monophonic path for some element y in Sx. The minimum cardinality of an x-monophonic set of g is the x-monophonic set of G is an x-monophonic set Sx such that the subgraph G[Sx]induced by Sx is connected. The minimum cardinality of a connected x-monophonic set of G is defined as the connected x-monophonic number of G and is denoted by cmx(G). A subset T of a minimum connected x-monophonic set Sx of G is called an x-forcing subset for Sx if Sx is the unique minimum connected x-monophonic set containing T. An x-forcing subset for Sx of minimum cardinality is a minimum x-forcing subset of Sx. The forcing connected x-monophonic number of Sx, denoted by fcmx(Sx), is the cardinality of a minimum x-forcing subset for Sx. The forcing connected x-monophonic number of G is fcmx (G) = min {fcmx (Sx)}, where the minimum is taken over all minimum connected x-monophonic sets Sx in G. We determine bounds for it and find the forcing connected vertex monophonic number for some special classes of graphs. For any two positive integers a and b with 0≤ a < b-1, there exists a connected graph G with fcmx(G) = a and cmx (G) =b for some vertex x in G.

THE DETOUR MONOPHONIC GRPHOIDAL COVERING NUMBER OF A GRAPH

P. TITUS,S. SANTHA KUMARI 장전수학회 2016 Proceedings of the Jangjeon mathematical society Vol.19 No.1

A chord of a path P is an edge joining two non-adjacent ver- tices of P. A path P is called a monophonic path if it is a chordless path. A path P is called a detour monophonic path in G if it is a longest mono- phonic path in G. A detour monophonic graphoidal cover of a graph G is a collection dm of detour monophonic paths in G such that every vertex of G is an internal vertex of at most one detour monophonic path in dm and every edge of G is in exactly one detour monophonic path in dm. The minimum cardinality of a detour monophonic graphoidal cover of G is called the detour monophonic graphoidal covering num- ber of G and is denoted by dm(G). We determine bounds for it and characterize graphs which realize the bounds. Also, we find the detour monophonic graphoidal covering number of unicyclic graphs.

Prophetic Ways of Transmitting the Word of God

Joseph Titus 신학과사상학회 2015 가톨릭 신학과 사상 Vol.- No.76

This article titled “Prophetic Ways of Transmitting the Word of God” aims at expounding the role of the Israelite prophets in communicating the Word of God to the people of their times. The purpose of this venture is to draw insights from the prophets to communicate God’s Word to the people of our times. This article consists of three parts. The first part tries to show that by their vocation, Israelite prophets were regarded primarily as official recipients and transmitters of the Word of the Lord (Jer 1:2), for they hear and speak what the Lord has spoken to them (Isa 1:2; 6:8-10). This role of the prophets is very well brought out in Deut 18:18, wherein the Lord himself says: “I will put my words in the mouth of the prophet, who shall speak to them everything that I command.” This is why the people of Israel expected from the prophets the word (dabar), as they expected instruction (torah) from the priest and counsel (esah) from the wise (Jer 18:18). Therefore if there is no prophet in Israel, there would be “famine of hearing the Word of God” (Am 8:1). The second part discusses the manner in which the prophets carried out their ministry of the Word of God. God entrusted the prophets with his Word not to keep it to themselves but to transmit it to the people. The article argues that the prophets have attempted to perform their ministry of God’s Word through at least four modes, namely through their words, deeds, life and writings. First of all, the prophet is a man of the Word. Whatever he speaks is initiated by God. As he is God’s messenger, he begins always his speech in the divine first person: “Thus says the Lord.” Secondly, prophetic message is more than words. The prophets drama-tized their spoken word with symbolic action. A number of reports of symbolic action could be found in the prophetic literature. Thirdly, at times the very life of the prophets of the OT conveyed God’s Word to the people: the unhappy marriage of Hosea, the celibacy of Jeremiah, his exclusion from the Temple, the catalepsy of Ezekiel were still more eloquent than their words and symbolical actions. Finally the prophets transmitted God’s Word not only orally and by their very life, but also through writing scrolls. In its third part, the article explains the sufferings encountered by the prophets while delivering God’s Word. During their ministry, the prophets risked their reputations and their lives by challenging the accepted standards of society. Because of their suffering, at times, some of them felt the temptation to abandon their ministry. The article concludes by inviting us to appreciate the prophetic im-agination and creativity which they employed to adapt alternative means of communication in the ministry. In order to make a memorable impres-sion of God’s Word in the minds of our audience, we are invited to discern the most fitting model of transmission for the appropriate situation for our times.

From Technocracy to Aristocracy: The Changing Career Paths of Japanese Politicians

Christopher Titus North 동아시아연구원 2005 Journal of East Asian Studies Vol.5 No.2

My study investigates whether there has been a relative decline in the position of the Japanese bureaucracy in their relationship with politicians in recent decades. My hypothesis is that the loss of bureaucratic influence has largely been a function of the declining position of former bureaucrats within the ruling Liberal Democrat Party (LDP), and that it has largely been politicians who were able to enter the Diet at a young age due to hereditary recruitment who have gained influence. Their ability to build up seniority has placed them at an advantage in promotion to key party and government posts due to the adoption of a seniority system of selecting cabinet ministers and party leaders. I use probit and logit analysis of LDP cabinet and Diet members (1955-2003) to demonstrate the decline of former bureaucrats within the LDP in terms of their overall numbers and their occupancy of key posts.