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Citation - WoS: 8
Citation - Scopus: 9
Antifungal Screening and in Silico Mechanistic Studies of an In-House Azole Library
(2019) Sarı, Suat; Özdemir, Serpil; Kart, Didem; Sabuncuoğlu, Suna; Doğan, İnci Selin; Özdemir, Zeynep; Bozbey, İrem; Gencel, Melis; Eşsiz, Şebnem; Reynisson, Jóhannes; Karakurt, Arzu; Saraç, Selma; Dalkara, Sevim; Advertising
Systemic Candida infections pose a serious public health problem with high morbidity and mortality. C. albicans is the major pathogen identified in candidiasis; however, non-albicans Candida spp. with antifungal resistance are now more prevalent. Azoles are first-choice antifungal drugs for candidiasis; however, they are ineffective for certain infections caused by the resistant strains. Azoles block ergosterol synthesis by inhibiting fungal CYP51, which leads to disruption of fungal membrane permeability. In this study, we screened for antifungal activity of an in-house azole library of 65 compounds to identify hit matter followed by a molecular modeling study for their CYP51 inhibition mechanism. Antifungal susceptibility tests against standard Candida spp. including C. albicans revealed derivatives 12 and 13 as highly active. Furthermore, they showed potent antibiofilm activity as well as neglectable cytotoxicity in a mouse fibroblast assay. According to molecular docking studies, 12 and 13 have the necessary binding characteristics for effective inhibition of CYP51. Finally, molecular dynamics simulations of the C. albicans CYP51 (CACYP51) homology model's catalytic site complexed with 13 were stable demonstrating excellent binding.
Citation - WoS: 2
Citation - Scopus: 6
Branch Outage Simulation Based Contingency Screening by Gravitational Search Algorithm
(Praise Worthy Prize Srl, 2012) Ceylan, Oğuzhan; Ceylan, Oğuzhan; Özdemir, Aydoğan; Dağ, Hasan; Dağ, Hasan; Özdemir, Serpil; Advertising; Management Information Systems
Power systems contingency analysis is an important issue for electric power system operators. This paper performs branch outage simulation based contingency screening using a bounded network approach. Local constrained optimization problem representing the branch outage phenomena is solved by the gravitational search algorithm. The proposed method is applied to IEEE 14 30 57 and 118 Bus Test systems and its performance from the point of capturing violations is evaluated. In addition false alarms and the computational accuracy of the proposed method are also analyzed by using scattering diagrams. Finally the proposed gravitational search based contingency screening is compared with full AC load flow solutions from the point of computational speed. Copyright (C) 2012 Praise Worthy Prize S.r.l. - All rights reserved.
Citation - Scopus: 12
Comparison of Post Outage Bus Voltage Magnitudes Estimated by Harmony Search and Differential Evolution Methods
(2009) Ceylan, Oğuzhan; Ceylan, Oğuzhan; Özdemir, Aydoğan; Dağ, Hasan; Dağ, Hasan; Özdemir, Serpil; Advertising; Management Information Systems
Contingency studies are indispensable tools of both the power system planning and operational studies. Real time implementation of operational problems makes necessary the use of high speed computational methods while requiring reasonable accuracies. On the other hand, accuracy of the results and the speed of calculation depend on branch outage modeling as well as solution algorithm used. This paper presents a comparison of post outage bus voltage magnitudes calculated by two meta-heuristic approaches; namely differential evolution (DE) and harmony search (HS) methods. The methods are tested on IEEE 14, IEEE 30, IEEE 57, and IEEE 118 bus test systems and the results are compared both in terms of accuracy and calculation speed.
Citation - WoS: 2
Citation - Scopus: 2
Double Branch Outage Modeling and Simulation: Bounded Network Approach
(Elsevier Science, 2015) Ceylan, Oğuzhan; Dağ, Hasan; Özdemir, Aydoğan; Ceylan, Oğuzhan; Dağ, Hasan; Özdemir, Serpil; Advertising; Management Information Systems
Energy management system operators perform regular outage simulations in order to ensure secure operation of power systems. AC power flow based outage simulations are not preferred because of insufficient computational speed. Hence several outage models and computational methods providing acceptable accuracy have been developed. On the other hand double branch outages are critical rare events which can result in cascading outages and system collapse. This paper presents a double branch outage model and formulation of the phenomena as a constrained optimization problem. Optimization problem is then solved by using differential evolution method and particle swarm optimization algorithm. The proposed algorithm is applied to IEEE test systems. Computational accuracies of differential evolution based solutions and particle swarm optimization based solutions are discussed for IEEE 30 Bus Test System and IEEE 118 Bus Test System applications. IEEE 14 Bus Test System IEEE 30 Bus Test System IEEE 57 Bus Test System IEEE 118 Bus Test System and IEEE 300 Bus Test System simulation results are compared to AC load flows in terms of computational speed. Finally the performance of the proposed method is analyzed for different outage configurations. (C) 2015 Elsevier Ltd. All rights reserved.
Citation - WoS: 0
Citation - Scopus: 2
Entrenching Geopolitical Imaginations: Brand(ing) Turkey Through Orhan Pamuk
(Palgrave Macmillan Ltd., 2020) Yalkın, Çağrı; Yalkın, Çağrı; Yanık, Lerna K.; Koharik Yanık, Lerna; Advertising; Political Science and International Relations
This study focuses on how through consumers the market reproduces a discourse that aligns with the political and the cultural spheres. By drawing on fields of production and consumption we turn to how both Turkey as a nation-brand and Orhan Pamuk as a cultural producer are produced and consumed at the nexus of political and cultural fields. Based on the analysis of data comprising of interviews with Orhan Pamuk and Amazon consumer reviews of his work we argue that the consumers of Pamuk’s works duplicate and reiterate dualities that have come to represent Turkey. This highlights the role of cultural products as nation-brand makers and the markets as where arts and politics intersect. We suggest that cultural products serve as vehicles through which existing perceptions and real and perceived global political hierarchies are reproduced. © 2018 Springer Nature Limited.
Citation - WoS: 21
Citation - Scopus: 34
Grey Wolf Optimizer for Allocation and Sizing of Distributed Renewable Generation
(Institute of Electrical and Electronics Engineers Inc., 2019) Ahmadi, Bahman; Ceylan, Oğuzhan; Ceylan, Oğuzhan; Özdemir, Serpil; Özdemir, Aydoğan; Advertising; Management Information Systems
Increasing penetration of distributed energy resources (DERs) have brought operational and control philosophy changes in Smart Grids (SGs). Renewable energy based technologies are becoming more important due to their economic and environmental impacts. Distributed generations (DGs) in the form of small renewable energy resources such as solar photovoltaics (PVs) and Wind Turbines (WTs) are connected in radial distribution networks near to the loads. This paper presents optimal siting and sizing of distributed renewable energy resource to maintain voltage magnitude profiles. Bus voltage magnitude differences for each hour in a day of a distribution system are formulated as an objective function. Three consecutive days are taken into account representing the three seasons of a year. A new nature inspired algorithm Grey Wolf Optimizer (GWO) is used as a solution tool. The proposed formulation is applied to 33 bus and 69 bus radial distribution networks. MATLAB simulations are performed to validate the performance of the approach. Simulation results are discussed and compared with of the several available ones'.
Citation - WoS: 11
Citation - Scopus: 12
(il)legitimisation of the Role of the Nation State: Understanding of and Reactions To Internet Censorship in Turkey
(Sage Publications Ltd, 2014) Yalkın, Çağrı; Yalkın, Çağrı; Kerrigan, Finola; vom, Lehn Dirk; Advertising
This study aims to explore Turkish citizen-consumers' understanding of and reactions to censorship of websites in Turkey by using in-depth interviews and online ethnography. In an environment where sites such as YouTube and others are increasingly being banned the citizen-consumers' macro-level understanding is that such censorship is part of a wider ideological plan and their micro-level understanding is that their relationship with the wider global network is reduced in the sense that they have trouble accessing full information on products services and experiences. The study revealed that citizen-consumers engage in two types of resistance strategies against such domination by the state: using irony as passive resistance and using the very same technology used by the state to resist its domination.
Citation - WoS: 0
Citation - Scopus: 4
Impacts of Load and Generation Volatilities on the Voltage Profiles Improved by Distributed Energy Resources
(Institute of Electrical and Electronics Engineers Inc., 2020) Ahmedi, Bahman; Ceylan, Oğuzhan; Ceylan, Oğuzhan; Özdemir, Serpil; Özdemir, Aydoğan; Advertising; Management Information Systems
Weather-dependent distributed renewable energy sources such as photovoltaics (PVs) and wind turbines (WT) are increasingly being connected to distribution networks (DNs). Increased penetration of these intermittent sources brought the necessity of using energy storage systems (ESSs) to achieve the intended benefits. This study presents an optimization process to determine optimal numbers, sizes, locations and distributed energy resources (DERs) as well as to determine the optimal operating strategy of ESSs in a distribution network. The objective is to improve the voltage profile and to minimize the installation costs. The proposed multi-objective formulation problem is solved by using ant lion multi-objective optimization algorithm. At the second part of the study, optimal values are tested with monthly extreme distributions and the impacts of load and distributed generation volatilies on the voltage profiles which were determined by Pareto-optimal solution candidates are analysed. Simulations were performed on 33 bus radial distribution system using Matlab. Finally the benefits obtained by the optimal solutions with less risk are compared.
Citation - WoS: 1
Citation - Scopus: 1
Invented Myths in Contemporary Turkish Political Advertising
(Springer, 2016) Koçer Çamurdan, Suncem; Yalkın, Çağrı; Advertising; Public Relations and Information
This article focuses on the November 2015 elections in Turkey and analyzes the discourses embedded in the political campaign videos produced and circulated by the Justice and Development Party (ruling party since 2002) Republican People's Party (first political party of the republic) People's Democratic Party (main vehicle of the Kurdish politics) and Nationalist Movement Party (ethno-nationalist party). Republic of Turkey's construction in the national imagination over the past 90 years have both rested on and reproduced a range of themes which are themselves based on recently invented nationalist myths such as the common enemy the multicultural mosaic order and progress fight against imperialism the break from the Ottoman empire and Turkey as bridge between east-and-west. Hence we argue that regardless of their severely diverse stance on key issues in the political realm all the political parties use the hegemony's myths as tools in their advertisements therefore reifying these themes in the public imagination.
"kristal Elma Yaratıcılık Festivalinde (1988-2018) Cam Tavan Olgusu: Kadın Jüri Üyesi Oranlarına Dair Bir İnceleme"
(İmge Kitabevi Yayınları, 2019) Binay Kurultay, Ayşe; Binay Kurultay, Ayşe; Advertising
Toplumsal cinsiyete dayalı eşitsizliklerin ve cinsiyetçi rollerin iş yaşamındaki varlığı kadın çalışanların meslek sahibi olabileceği alanları etkilemektedir. Erkeklerin geleneksel olarak daha fazla yer aldığı mesleklerde kadınların karşılaştıkları zorluklar akademik literatürde çeşitli kapsamlarda incelenmiştir. Toplumsal cinsiyeti ideolojik bir güç olarak düşündüğümüzde, çalışma yaşamında karşılaşılan toplumsal cinsiyet eşitsizlikleri, kalıp davranışlar ve cinsiyetçi roller kadınların ataerkil sistemdeki ikincil konumunun göstergeleri olarak ele alınabilir. Reklam sektörü hem ulusal hem uluslararası düzeyde kadınların rahatlıkla yer alabildiği bir alan olarak görünmesine rağmen, bu yaratıcı sektörde de cinsiyet ayrımı gözlemlenmektedir. Hem dikey hem yatay ayrışmanın görüldüğü reklamcılık sektöründe kadınların, özellikle yaratıcı karar alma pozisyonlarında yaygın ve küresel olarak yeterince temsil edilmemesi, reklam ajanslarında yaşanan problemli konulardan biridir. Uluslararası reklam ajanslarının yoğunlukta olduğu Türkiye’de reklamcılık sektörü hakkında cinsiyet eşitliği odaklı çalışmalara ihtiyaç duyulmaktadır. Dolayısıyla kadınların reklamcılık alanındaki karar alma pozisyonlarının incelenmesi önemlidir. Bu çalışmanın amacı kadınların reklam yaratıcılığı alanındaki karar alma mekanizmalarından biri olan yarışma jürilerine katılımlarını incelemek ve reklamcılık sektöründeki cinsiyet eşitsizliğini ortaya koyarak uygulamaya yönelik bu sorunun çözümüne katkıda bulunmaktır. Bu çalışmada Türkiye’nin ilk, en uzun süreli ve en önemli reklam yaratıcılığı yarışması olan Kristal Elma Yaratıcılık Festivali’nin seçici kurullarındaki kadınların temsil oranları incelenmiştir. 1988 yılından 2018 yılına kadar 30 yıldır toplanan Kristal Elma Yaratıcılık Ödülleri Seçici Kurullarındaki kadın oranları incelendiğinde jürilerin erkek-egemen yapısı göze çarpmaktadır.
NİTEL DÜŞÜNCE VE ETNOGRAFİ: ETNOGRAFİK YÖNTEME DÜŞÜNSEL BİR YAKLAŞIM
(Hacettepe Üniversitesi İletişim Fakültesi, 2017) Kartarı, Asker; Kartarı, Asker; Advertising
Bu yazıda niteliksel düşüncenin ne olduğunu, nereden kaynaklandığını ve etnografi ile olan ilişkisini irdelemeye çalışacağım. “Bilgi”yi öznenin nesne ile kurduğu bağın ürünü olarak kabul edersek, amacım, öznenin, yani araştırmacının araştırma nesnesi ile bağ kurmak için kullandığı çıkış noktasının nesneyi anlamada ne kadar etkin olduğunu ortaya koymaktan ibarettir.
Citation - Scopus: 11
Optimal Allocation Of Multi-Type Distributed Generators For Minimization Of Power Losses In Distribution Systems
(Institute of Electrical and Electronics Engineers Inc., 2019) Ahmadi, Bahman; Ceylan, Oğuzhan; Ceylan, Oğuzhan; Özdemir, Serpil; Özdemir, Aydoğan; Advertising; Management Information Systems
Distributed generation (DG), including photovoltaics (PVs), wind turbines (WTs) are becoming vital for Active Distribution Networks (ADN). Therefore, optimal sizing and allocation of these units can improve voltage profiles and reduce active power losses. This study concentrates on optimal allocation and sizing of two kinds of DG units (PVs and WTs) with 1 MW maximum size limits, due to the regulations in Turkey. The Whale optimization algorithm (WOA) and Grey wolf optimization algorithm (GWO) are used as optimization tools to minimize active power losses of 33 and 69 Bus Test Systems. The performance analysis of the methods are performed through simulations and the numerical results are compared in terms of optimal OF values and convergence characteristics.
Citation - WoS: 0
Citation - Scopus: 1
Parallel Contingency Analysis Using Differential Evolution Based Solution for Branch Outage Problem
(IEEE, 2010) Ceylan, Oğuzhan; Dağ, Hasan; Dağ, Hasan; Ceylan, Oğuzhan; Özdemir, Aydoğan; Özdemir, Serpil; Advertising; Management Information Systems
Contingency analysis is one of the most fundamental work an electricity management center operator has to perform regularly. If both bus voltage magnitudes and reactive power flowing on the branches during any type of outages are within the acceptable limits the system is called secure. In this paper we solve the contingency problem using a recently developed local constrained optimization based branch outage problem. The optimization problem resulted from the formulation of branch outage is solved by differential evolution method. Using Matlab's parallel computing toolbox contingency analysis for IEEE 300 test system is performed and the results are presented. The study shows that it is straight forward to implement contingency analysis on the Matlab's parallel environment and obtain near linear speedups.
Reklamlarda Karikatür Kullanımı: Piyale Örneği
(Ankara Hacı Bayram Veli Üniversitesi İletişim Fakültesi, 2015) Binay Kurultay, Ayşe; Binay Kurultay, Ayşe; Pekseven Sabuncuoğlu, Burcu; Advertising
Bir mizah sanatı olan karikatürün, eğlendirmenin yanı sıra düşündürmek, öğretmek ve ikna etmek gibi özellikleri karikatürü reklamcılar için cazip hale getirmiştir. Anlatmak istediğini sade bir dille çarpıcı bir biçimde anlatan karikatür, sıralanan tüm bu özellikleriyle tüketicide davranış değiştirmekte önemli bir araç olabilmektedir. Karikatürlü reklamların hedefleri arasında olan ürün satmanın dışında bilinirlik arttırmak da vardır. Karikatürlü reklamlar da tüm reklamlar gibi bunu kimi zaman bir sloganla kimi zamanda zihinlerde markaya özgü bir konum yaratıp, markaya bir karakter ve kimlik kazandırarak yapmaktadır. Türkiye’de 1960’lı yıllarda karikatür, başta banka ve makarna reklamlarında olmak üzere sektördeki birçok markanın reklamlarında etkin olarak kullanılmıştır. Bu çalışmada örnek olarak karikatürün, bir pazarlama yöntemi olan reklamla ilişkisi, “Türkiye’yi makarna ile tanıştıran marka” olarak bilinen Piyale Makarnaları’nın 1960’lı yıllardaki on karikatürlü reklamı esas alınarak incelenmiştir. Piyale markasının 1960’lı yıllarda karikatürlü reklam kullanan markaların başında gelmesi ve markanın sadece karikatürlü reklamlardan oluşan kampanyalar düzenlemiş olması, bu markanın örneklem olarak seçilmesinde etkili olmuştur. Karikatürün resme dayalı mesajlarla örülü olması nedeniyle yöntem olarak postyapısalcı göstergebilimsel analiz kullanılmıştır. Dolayısıyla karikatürün metin evreni olduğu kadar sembolik evreni de tarihsel dönem aralığının göstergeleri anlamlandırmadaki önemi dikkate alınarak incelenmiştir. Bu doğrultuda karikatürlü reklamların yayınlandığı yıllarda karikatürlere konu olması dolayısıyla Türkiye’de kadın, aile, sağlık, güven gibi temalar dönemsellik gözetilerek gösterge bilimsel olarak değerlendirilmiştir.
Citation - WoS: 0
Silkroad Onions and Clean Money
(Sage Publications Inc, 2015) Yalkın, Çağrı; Yalkın, Çağrı; Kerrigan, Finola; Advertising
[Abstract Not Available]
Citation - WoS: 3
Citation - Scopus: 3
Talking Fashion in Female Friendship Groups: Negotiating the Necessary Marketplace Skills and Knowledge
(Kluwer Academic Publishers, 2014) Yalkın, Çağrı; Yalkın, Çağrı; Elliott, Richard; Advertising
This study revisits contexts of consumer socialization by focusing on fashion consumption among female teenagers. Focus groups and interviews have been utilized to collect data from 12- to 16-year-old female adolescents. The findings indicate that the adolescents cultivate both rational and symbolic skills within their friendship groups through friendship talk. The paper contributes to consumer socialization studies by examining the role of social relationships in and the accounts of the actual uses of fashion products. By doing so it extends scholars' policy makers' schools' and families' understanding of the dynamics involved in the building of young people's consumer identities and what type of issues they face as young consumers. Thus the study provides policy makers with information regarding how consumer skills and knowledge are cultivated and the role of the friendship group in cultivating them which can be used in formulating future policy aimed at consumer education literacy programmes and social marketing aimed at adolescents. © 2014 Springer Science+Business Media New York.
Citation - WoS: 0
Citation - Scopus: 0
Towards Faster Branch Outage Simulations Using Simulated Annealing and Parallel Programming
(IEEE, 2009) Ceylan, Oğuzhan; Dağ, Hasan; Özdemir, Aydoğan; Ceylan, Oğuzhan; Dağ, Hasan; Özdemir, Serpil; Advertising; Management Information Systems
Contingency studies such as branch outage and generator outage are among important studies of energy management centers operations. Branch outage modeling on the other hand is one of the basic steps of post-outage state estimation of an electrical power system. Real time implementation of the problem brings the necessity of using high speed methods while providing a reasonable accuracy. This paper presents simulated annealing based solution of the branch outage event which is formulated as a local optimization problem. To speed up the solution procedure the distributed computing toolbox of Matlab is used as a parallel programming tool. The results of the proposed method are compared to those of full AC method and are discussed both from the point of accuracy and solution speed.
Türkiye'de Sosyal Medyanın Siyasi Katılıma Etkileri
(Uluslararası Kıbrıs Üniversitesi, 2015) Şener, Gülüm; Öğün Emre, Perrin; Akyıldız, Fatih; Advertising
Sosyal ağların yaygınlaşmasıyla birlikte katılımcı demokrasi pratikleri artmakta, temsili demokrasilerin kısıtlı siyasi katılım biçimlerine alternatif yeni katılım biçimleri doğmakta, çevrimiçi siyasi pratikler ile çevrimdışı pratikler iç içe geçerek siyasi yaşamda önemli değişimlere neden olmaktadır. Önceki yıllarda Arap Baharı, Wall Streeti İşgal Et Hareketi, İspanyadaki ekonomik krize karşı ortaya çıkan Öfkeliler Hareketi vb. toplumsal hareketlerde sosyal medya haberleşme, örgütlenme ve eyleme geçme aşamalarında önemli, kalıcı siyasi ve toplumsal değişimlere yol açmıştır. Bir grup araştırmacı İnternetin siyasi olarak etkin ve siyasetle ilgili vatandaşları harekete geçirdiğini ileri sürmektedir. Diğer yandan şüpheci araştırmacılar, sosyal ağlar üzerinden erişim ve etkileşimin tek başına siyasi katılımı kapsamak için yeterli olmadığının, demokrasinin ilerlemesinde tek başına bir rol üstlenemeyeceğinin altını çizmektedir. Türkiyede Gezi Parkı Direnişi sürecinde sosyal medya, anaakım medyaya alternatif bir haber kaynağı olmuş, direnişçilerin haberleşmesinde, yardımlaşmasında ve örgütlenmesinde, direnişin sürekliliğinin sağlanmasında ve kitlelerin direnişe katılmalarında rol oynamıştır. Bir yanıyla, örgütsüzlerin, genç kuşağın, toplumda sınırlara itilen kimliklerin buluştuğu Gezi Parkı Direnişi, sosyal medya kullanımını da etkileyerek sosyal ağları direnişin mekânları haline getirmiş, yeni alternatif katılım ağlarının doğmasına vesile olmuştur. Gezi Direnişi hala anlaşılmaya çalışılırken, yurttaşların sosyal ağlardaki toplumsal ve siyasal katılımlarına dair ampirik verilerle genel bir durum değerlendirmesini ortaya koymak önem taşımaktadır. Bu çalışmanın amacı, Türkiye genelinde sosyal medyanın bireylerin siyasi katılımına etkilerini ölçümlemektir. Araştırmada veriler, 11 il bazında telefonla anket tekniğiyle toplanmıştır. Sonuç olarak sosyal medyanın bireylerin siyasi katılımına görece etkide bulunduğu, yaş, eğitim düzeyi, sosyo-ekonomik düzey ile bireylerin siyasete ilgi düzeyinin çevrim içi siyasete katılımda önemli faktörler olduğu ortaya çıkmıştır. With the proliferation of social networking sites, participatory democratic practices increase, new forms of political participation emerge as alternative to the limited ways of political participation in representative democracies, and also online and offline political practices merge, resulting in prominent changes in political life. In recent years, social media led some permanent political and social changes on communicational, organizational and action levels in social movements such as Arab Spring, Occupy Wall Street, Indignados which occurred against the economic crisis in Spain. A group of scholars argue that the Internet mobilizes people who are already politically active and interested in political issues. However, sceptic scholars underline that the access and interaction via social networking only is not adequate enough for political participation and also can not play a unique role for the enhancement of democracy. During Gezi Park Resistance in Turkey, social media became an alternative news source, it played an important role on communication, organization and cooperation of dissidents providing consistency of resistance by allowing the participation of masses. In a sense, Gezi Parkı Resistance, in which disorganized people, young generation, marginalized identities meet, has contributed to the emergence of new alternative participation networks and made the social media into the arena of the resistance by affecting also the use of social media. Whereas the efforts to understand and frame Gezi Movement still continue among scholars, it seems important to make a general assessment about the civic and political participation of citizens in social networks in the light of empirical findings. This study aims to determine the effects of social media on individuals political participation in Turkey at large. The data were gathered from 11 cities using phone survey method. One of the key findings of the study is that social media have a relative impact on individuals political participation; and variables such as age, education, socio-economic level and the level of interest for politics play an important role in online civic engagement
Citation - WoS: 8
Citation - Scopus: 12
Voltage Profile Improving and Peak Shaving Using Multi-Type Distributed Generators and Battery Energy Storage Systems in Distribution Networks
(Institute of Electrical and Electronics Engineers Inc., 2020) Ahmedi, Bahman; Ceylan, Oğuzhan; Ceylan, Oğuzhan; Özdemir, Serpil; Özdemir, Aydoğan; Advertising; Management Information Systems
Optimal sizing and siting of distributed generation (DG) units play an important role for improving voltage profile and reducing power losses. Moreover, battery energy storage system (BESS) units may help peak shaving. This paper presents a two stage approach, first of which aims optimal DG unit allocation, and second aims to determine optimal location and operation of BESS units. The problem formulation adopted due to the regulations in Turkey that supports DG units (Photovoltaics-PVs and Wind Turbines-WTs) with maximum unit size of 1 MW. A recently developed heuristic optimization method named as Harris hawks optimization (HHO) algorithm is used for obtaining near optimal solutions. We tested the developed model by using 33 and 141 bus distribution test systems.

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